WorldWideScience

Sample records for ambulatory human motion

  1. Ambulatory human motion tracking by fusion of inertial and magnetic sensing with adaptive actuation

    NARCIS (Netherlands)

    Schepers, H. Martin; Roetenberg, Daniel; Veltink, Peter H.

    2010-01-01

    Over the last years, inertial sensing has proven to be a suitable ambulatory alternative to traditional human motion tracking based on optical position measurement systems, which are generally restricted to a laboratory environment. Besides many advantages, a major drawback is the inherent drift cau

  2. Flexible Capacitive Electrodes for Minimizing Motion Artifacts in Ambulatory Electrocardiograms

    Directory of Open Access Journals (Sweden)

    Jeong Su Lee

    2014-08-01

    Full Text Available This study proposes the use of flexible capacitive electrodes for reducing motion artifacts in a wearable electrocardiogram (ECG device. The capacitive electrodes have conductive foam on their surface, a shield, an optimal input bias resistor, and guarding feedback. The electrodes are integrated in a chest belt, and the acquired signals are transmitted wirelessly for ambulatory heart rate monitoring. We experimentally validated the electrode performance with subjects standing and walking on a treadmill at speeds of up to 7 km/h. The results confirmed the highly accurate heart rate detection capacity of the developed system and its feasibility for daily-life ECG monitoring.

  3. Ambulatory measurement of knee motion and physical activity: preliminary evaluation of a smart activity monitor

    Directory of Open Access Journals (Sweden)

    Malchau Henrik

    2006-09-01

    Full Text Available Abstract Background There is currently a paucity of devices available for continuous, long-term monitoring of human joint motion. Non-invasive, inexpensive devices capable of recording human activity and joint motion have many applications for medical research. Such a device could be used to quantify range of motion outside the gait laboratory. The purpose of this study was to test the accuracy of the modified Intelligent Device for Energy Expenditure and Activity (IDEEA in measuring knee flexion angles, to detect different physical activities, and to quantify how often healthy subjects use deep knee flexion in the ambulatory setting. Methods We compared Biomotion Laboratory (BML "gold standard" data to simultaneous IDEEA measures of knee motion and gait, step up/down, and stair descent in 5 healthy subjects. In addition, we used a series of choreographed physical activities outside the BML to confirm the IDEEA's ability to accurately measure 7 commonly-performed physical activities. Subjects then continued data collection during ordinary activities outside the gait laboratory. Results Pooled correlations between the BML and IDEEA knee flexion angles were .97 +/- .03 for step up/down, .98 +/- .02 for stair descent, and .98 +/- .01 for gait. In the BML protocol, the IDEEA accurately identified gait, but was less accurate in identifying step up/down and stair descent. During sampling outside the BML, the IDEEA accurately detected walking, running, stair ascent, stair descent, standing, lying, and sitting. On average, subjects flexed their knees >120° for 0.17% of their data collection periods outside the BML. Conclusion The modified IDEEA system is a useful clinical tool for evaluating knee motion and multiple physical activities in the ambulatory setting. These five healthy subjects rarely flexed their knees >120°.

  4. Motion Belts: Visualization of Human Motion Data on a Timeline

    Science.gov (United States)

    Yasuda, Hiroshi; Kaihara, Ryota; Saito, Suguru; Nakajima, Masayuki

    Because motion capture system enabled us to capture a number of human motions, the demand for a method to easily browse the captured motion database has been increasing. In this paper, we propose a method to generate simple visual outlines of motion clips, for the purpose of efficient motion data browsing. Our method unfolds a motion clip into a 2D stripe of keyframes along a timeline that is based on semantic keyframe extraction and the best view point selection for each keyframes. With our visualization, timing and order of actions in the motions are clearly visible and the contents of multiple motions are easily comparable. In addition, because our method is applicable for a wide variety of motions, it can generate outlines for a large amount of motions fully automatically.

  5. An optimized DSP implementation of adaptive filtering and ICA for motion artifact reduction in ambulatory ECG monitoring.

    Science.gov (United States)

    Berset, Torfinn; Geng, Di; Romero, Iñaki

    2012-01-01

    Noise from motion artifacts is currently one of the main challenges in the field of ambulatory ECG recording. To address this problem, we propose the use of two different approaches. First, an adaptive filter with electrode-skin impedance as a reference signal is described. Secondly, a multi-channel ECG algorithm based on Independent Component Analysis is introduced. Both algorithms have been designed and further optimized for real-time work embedded in a dedicated Digital Signal Processor. We show that both algorithms improve the performance of a beat detection algorithm when applied in high noise conditions. In addition, an efficient way of choosing this methods is suggested with the aim of reduce the overall total system power consumption.

  6. Motion segmentation method for hybrid characteristic on human motion.

    Science.gov (United States)

    Lau, Newman; Wong, Ben; Chow, Daniel

    2009-03-11

    Motion segmentation and analysis are used to improve the process of classification of motion and information gathered on repetitive or periodic characteristic. The classification result is useful for ergonomic and postural safety analysis, since repetitive motion is known to be related to certain musculoskeletal disorders. Past studies mainly focused on motion segmentation on particular motion characteristic with certain prior knowledge on static or periodic property of motion, which narrowed method's applicability. This paper attempts to introduce a method to tackle human joint motion without having prior knowledge. The motion is segmented by a two-pass algorithm. Recursive least square (RLS) is firstly used to estimate possible segments on the input human-motion set. Further, period identification and extra segmentation process are applied to produce meaningful segments. Each of the result segments is modeled by a damped harmonic model, with frequency, amplitude and duration produced as parameters for ergonomic evaluation and other human factor studies such as task safety evaluation and sport analysis. Experiments show that the method can handle periodic, random and mixed characteristics on human motion, which can also be extended to the usage in repetitive motion in workflow and irregular periodic motion like sport movement.

  7. Marker-Free Human Motion Capture

    DEFF Research Database (Denmark)

    Grest, Daniel

    Human Motion Capture is a widely used technique to obtain motion data for animation of virtual characters. Commercial optical motion capture systems are marker-based. This book is about marker-free motion capture and its possibilities to acquire motion from a single viewing direction. The focus...

  8. Computer Vision Method in Human Motion Detection

    Institute of Scientific and Technical Information of China (English)

    FU Li; FANG Shuai; XU Xin-he

    2007-01-01

    Human motion detection based on computer vision is a frontier research topic and is causing an increasing attention in the field of computer vision research. The wavelet transform is used to sharpen the ambiguous edges in human motion image. The shadow's effect to the image processing is also removed. The edge extraction can be successfully realized.This is an effective method for the research of human motion analysis system.

  9. The eigenmode analysis of human motion

    Science.gov (United States)

    Park, Juyong; Lee, Deok-Sun; González, Marta C.

    2010-11-01

    Rapid advances in modern communication technology are enabling the accumulation of large-scale, high-resolution observational data of the spatiotemporal movements of humans. Classification and prediction of human mobility based on the analysis of such data has great potential in applications such as urban planning in addition to being a subject of theoretical interest. A robust theoretical framework is therefore required to study and properly understand human motion. Here we perform the eigenmode analysis of human motion data gathered from mobile communication records, which allows us to explore the scaling properties and characteristics of human motion.

  10. The Eigenmode Analysis of Human Motion

    CERN Document Server

    Park, Juyong; Gonzalez, Marta C

    2016-01-01

    Rapid advances in modern communication technology are enabling the accumulation of large-scale, high-resolution observational data of spatiotemporal movements of humans. Classification and prediction of human mobility based on the analysis of such data carry great potential in applications such as urban planning as well as being of theoretical interest. A robust theoretical framework is therefore required to study and properly understand human motion. Here we perform the eigenmode analysis of human motion data gathered from mobile communication records, which allows us to explore the scaling properties and characteristics of human motion.

  11. Quantitative assessment of human motion using video motion analysis

    Science.gov (United States)

    Probe, John D.

    1993-01-01

    In the study of the dynamics and kinematics of the human body a wide variety of technologies has been developed. Photogrammetric techniques are well documented and are known to provide reliable positional data from recorded images. Often these techniques are used in conjunction with cinematography and videography for analysis of planar motion, and to a lesser degree three-dimensional motion. Cinematography has been the most widely used medium for movement analysis. Excessive operating costs and the lag time required for film development, coupled with recent advances in video technology, have allowed video based motion analysis systems to emerge as a cost effective method of collecting and analyzing human movement. The Anthropometric and Biomechanics Lab at Johnson Space Center utilizes the video based Ariel Performance Analysis System (APAS) to develop data on shirtsleeved and space-suited human performance in order to plan efficient on-orbit intravehicular and extravehicular activities. APAS is a fully integrated system of hardware and software for biomechanics and the analysis of human performance and generalized motion measurement. Major components of the complete system include the video system, the AT compatible computer, and the proprietary software.

  12. Interactive inverse kinematics for human motion estimation

    DEFF Research Database (Denmark)

    Engell-Nørregård, Morten Pol; Hauberg, Søren; Lapuyade, Jerome

    2009-01-01

    We present an application of a fast interactive inverse kinematics method as a dimensionality reduction for monocular human motion estimation. The inverse kinematics solver deals efficiently and robustly with box constraints and does not suffer from shaking artifacts. The presented motion...... estimation system uses a single camera to estimate the motion of a human. The results show that inverse kinematics can significantly speed up the estimation process, while retaining a quality comparable to a full pose motion estimation system. Our novelty lies primarily in use of inverse kinematics...... to significantly speed up the particle filtering. It should be stressed that the observation part of the system has not been our focus, and as such is described only from a sense of completeness. With our approach it is possible to construct a robust and computationally efficient system for human motion estimation....

  13. Ambulatory Surgical Measures - National

    Data.gov (United States)

    U.S. Department of Health & Human Services — The Ambulatory Surgical Center Quality Reporting (ASCQR) Program seeks to make care safer and more efficient through quality reporting. ASCs eligible for this...

  14. Ambulatory Surgical Measures - Facility

    Data.gov (United States)

    U.S. Department of Health & Human Services — The Ambulatory Surgical Center Quality Reporting (ASCQR) Program seeks to make care safer and more efficient through quality reporting. ASCs eligible for this...

  15. A Course in Physics of Human Motion

    Science.gov (United States)

    Halley, J. W.; Eaton, B.

    1975-01-01

    Describes a course in elementary mechanics especially designed for students of athletics and dance. Includes photographs, taken in a gymnasium laboratory, used for analyzing human motion. Student response is described. (Author/CP)

  16. An experimental characterization of human torso motion

    Science.gov (United States)

    Cafolla, Daniele; Chen, I.-Ming; Ceccarelli, Marco

    2015-12-01

    The torso plays an important role in the human-like operation of humanoids. In this paper, a method is proposed to analyze the behavior of the human torso by using inertial and magnetic sensing tools. Experiments are conducted to characterize the motion performance of the human torso during daily routine operations. Furthermore, the forces acting on the human body during these operations are evaluated to design and validate the performance of a humanoid robot.

  17. Ambulatory position and orientation tracking fusing magnetic and inertial sensing

    NARCIS (Netherlands)

    Roetenberg, Daniel; Slycke, Per J.; Veltink, Peter H.

    2007-01-01

    This paper presents the design and testing of a portable magnetic system combined with miniature inertial sensors for ambulatory 6 degrees of freedom ( DOF) human motion tracking. The magnetic system consists of three orthogonal coils, the source, fixed to the body and 3-D magnetic sensors, fixed to

  18. Human Perception of Ambiguous Inertial Motion Cues

    Science.gov (United States)

    Zhang, Guan-Lu

    2010-01-01

    Human daily activities on Earth involve motions that elicit both tilt and translation components of the head (i.e. gazing and locomotion). With otolith cues alone, tilt and translation can be ambiguous since both motions can potentially displace the otolithic membrane by the same magnitude and direction. Transitions between gravity environments (i.e. Earth, microgravity and lunar) have demonstrated to alter the functions of the vestibular system and exacerbate the ambiguity between tilt and translational motion cues. Symptoms of motion sickness and spatial disorientation can impair human performances during critical mission phases. Specifically, Space Shuttle landing records show that particular cases of tilt-translation illusions have impaired the performance of seasoned commanders. This sensorimotor condition is one of many operational risks that may have dire implications on future human space exploration missions. The neural strategy with which the human central nervous system distinguishes ambiguous inertial motion cues remains the subject of intense research. A prevailing theory in the neuroscience field proposes that the human brain is able to formulate a neural internal model of ambiguous motion cues such that tilt and translation components can be perceptually decomposed in order to elicit the appropriate bodily response. The present work uses this theory, known as the GIF resolution hypothesis, as the framework for experimental hypothesis. Specifically, two novel motion paradigms are employed to validate the neural capacity of ambiguous inertial motion decomposition in ground-based human subjects. The experimental setup involves the Tilt-Translation Sled at Neuroscience Laboratory of NASA JSC. This two degree-of-freedom motion system is able to tilt subjects in the pitch plane and translate the subject along the fore-aft axis. Perception data will be gathered through subject verbal reports. Preliminary analysis of perceptual data does not indicate that

  19. A dynamic human motion: coordination analysis.

    Science.gov (United States)

    Pchelkin, Stepan; Shiriaev, Anton S; Freidovich, Leonid B; Mettin, Uwe; Gusev, Sergei V; Kwon, Woong; Paramonov, Leonid

    2015-02-01

    This article is concerned with the generic structure of the motion coordination system resulting from the application of the method of virtual holonomic constraints (VHCs) to the problem of the generation and robust execution of a dynamic humanlike motion by a humanoid robot. The motion coordination developed using VHCs is based on a motion generator equation, which is a scalar nonlinear differential equation of second order. It can be considered equivalent in function to a central pattern generator in living organisms. The relative time evolution of the degrees of freedom of a humanoid robot during a typical motion are specified by a set of coordination functions that uniquely define the overall pattern of the motion. This is comparable to a hypothesis on the existence of motion patterns in biomechanics. A robust control is derived based on a transverse linearization along the configuration manifold defined by the coordination functions. It is shown that the derived coordination and control architecture possesses excellent robustness properties. The analysis is performed on an example of a real human motion recorded in test experiments.

  20. Robotics-based synthesis of human motion

    KAUST Repository

    Khatib, O.

    2009-05-01

    The synthesis of human motion is a complex procedure that involves accurate reconstruction of movement sequences, modeling of musculoskeletal kinematics, dynamics and actuation, and characterization of reliable performance criteria. Many of these processes have much in common with the problems found in robotics research. Task-based methods used in robotics may be leveraged to provide novel musculoskeletal modeling methods and physiologically accurate performance predictions. In this paper, we present (i) a new method for the real-time reconstruction of human motion trajectories using direct marker tracking, (ii) a task-driven muscular effort minimization criterion and (iii) new human performance metrics for dynamic characterization of athletic skills. Dynamic motion reconstruction is achieved through the control of a simulated human model to follow the captured marker trajectories in real-time. The operational space control and real-time simulation provide human dynamics at any configuration of the performance. A new criteria of muscular effort minimization has been introduced to analyze human static postures. Extensive motion capture experiments were conducted to validate the new minimization criterion. Finally, new human performance metrics were introduced to study in details an athletic skill. These metrics include the effort expenditure and the feasible set of operational space accelerations during the performance of the skill. The dynamic characterization takes into account skeletal kinematics as well as muscle routing kinematics and force generating capacities. The developments draw upon an advanced musculoskeletal modeling platform and a task-oriented framework for the effective integration of biomechanics and robotics methods.

  1. Generating Concise Rules for Human Motion Retrieval

    Science.gov (United States)

    Mukai, Tomohiko; Wakisaka, Ken-Ichi; Kuriyama, Shigeru

    This paper proposes a method for retrieving human motion data with concise retrieval rules based on the spatio-temporal features of motion appearance. Our method first converts motion clip into a form of clausal language that represents geometrical relations between body parts and their temporal relationship. A retrieval rule is then learned from the set of manually classified examples using inductive logic programming (ILP). ILP automatically discovers the essential rule in the same clausal form with a user-defined hypothesis-testing procedure. All motions are indexed using this clausal language, and the desired clips are retrieved by subsequence matching using the rule. Such rule-based retrieval offers reasonable performance and the rule can be intuitively edited in the same language form. Consequently, our method enables efficient and flexible search from a large dataset with simple query language.

  2. National Hospital Ambulatory Medical Care Survey

    Data.gov (United States)

    U.S. Department of Health & Human Services — The National Hospital Ambulatory Medical Care Survey (NHAMCS) is designed to collect data on the utilization and provision of ambulatory care services in hospital...

  3. Predicting articulated human motion from spatial processes

    DEFF Research Database (Denmark)

    Hauberg, Søren; Pedersen, Kim Steenstrup

    2011-01-01

    We present a probabilistic interpretation of inverse kinematics and extend it to sequential data. The resulting model is used to estimate articulated human motion in visual data. The approach allows us to express the prior temporal models in spatial limb coordinates, which is in contrast to most...

  4. Human v6: the medial motion area.

    Science.gov (United States)

    Pitzalis, S; Sereno, M I; Committeri, G; Fattori, P; Galati, G; Patria, F; Galletti, C

    2010-02-01

    Cortical-surface-based functional Magnetic Resonance Imaging mapping techniques and wide-field retinotopic stimulation were used to verify the presence of pattern motion sensitivity in human area V6. Area V6 is highly selective for coherently moving fields of dots, both at individual and group levels and even with a visual stimulus of standard size. This stimulus is a functional localizer for V6. The wide retinotopic stimuli used here also revealed a retinotopic map in the middle temporal cortex (area MT/V5) surrounded by several polar-angle maps that resemble the mosaic of small areas found around macaque MT/V5. Our results suggest that the MT complex (MT+) may be specialized for the analysis of motion signals, whereas area V6 may be more involved in distinguishing object and self-motion.

  5. Articulated Human Motion Tracking Using Sequential Immune Genetic Algorithm

    Directory of Open Access Journals (Sweden)

    Yi Li

    2013-01-01

    Full Text Available We formulate human motion tracking as a high-dimensional constrained optimization problem. A novel generative method is proposed for human motion tracking in the framework of evolutionary computation. The main contribution is that we introduce immune genetic algorithm (IGA for pose optimization in latent space of human motion. Firstly, we perform human motion analysis in the learnt latent space of human motion. As the latent space is low dimensional and contents the prior knowledge of human motion, it makes pose analysis more efficient and accurate. Then, in the search strategy, we apply IGA for pose optimization. Compared with genetic algorithm and other evolutionary methods, its main advantage is the ability to use the prior knowledge of human motion. We design an IGA-based method to estimate human pose from static images for initialization of motion tracking. And we propose a sequential IGA (S-IGA algorithm for motion tracking by incorporating the temporal continuity information into the traditional IGA. Experimental results on different videos of different motion types show that our IGA-based pose estimation method can be used for initialization of motion tracking. The S-IGA-based motion tracking method can achieve accurate and stable tracking of 3D human motion.

  6. Human Muscle Fatigue Model in Dynamic Motions

    CERN Document Server

    Ma, Ruina; Bennis, Fouad; Ma, Liang

    2012-01-01

    Human muscle fatigue is considered to be one of the main reasons for Musculoskeletal Disorder (MSD). Recent models have been introduced to define muscle fatigue for static postures. However, the main drawbacks of these models are that the dynamic effect of the human and the external load are not taken into account. In this paper, each human joint is assumed to be controlled by two muscle groups to generate motions such as push/pull. The joint torques are computed using Lagrange's formulation to evaluate the dynamic factors of the muscle fatigue model. An experiment is defined to validate this assumption and the result for one person confirms its feasibility. The evaluation of this model can predict the fatigue and MSD risk in industry production quickly.

  7. Delayed response to animate implied motion in human motion processing areas

    NARCIS (Netherlands)

    Lorteije, J.A.M.; Kenemans, J.L.; Jellema, T.; Lubbe, R.H.J. van der; Heer, F. de; Wezel, R.J.A. van

    2006-01-01

    Viewing static photographs of objects in motion evokes higher fMRI activation in the human medial temporal complex (MT+) than looking at similar photographs without this implied motion. As MT+ is traditionally thought to be involved in motion perception (and not in form perception), this finding sug

  8. Delayed Response to Animate Implied Motion in Human Motion Processing Areas

    NARCIS (Netherlands)

    Lorteije, Jeannette A.M.; Kenemans, J. Leon; Jellema, Tjeerd; Lubbe, van der Rob H.J.; Heer, de Frederiek; Wezel, van Richard J.A.

    2006-01-01

    Viewing static photographs of objects in motion evokes higher fMRI activation in the human medial temporal complex (MT+) than looking at similar photographs without this implied motion. As MT+ is traditionally thought to be involved in motion perception (and not in form perception), this finding sug

  9. Measurement and Quantification of Gross Human Shoulder Motion

    Directory of Open Access Journals (Sweden)

    Jeremy T. Newkirk

    2013-01-01

    Full Text Available The shoulder girdle plays an important role in the large pointing workspace that humans enjoy. The goal of this work was to characterize the human shoulder girdle motion in relation to the arm. The overall motion of the human shoulder girdle was characterized based on motion studies completed on test subjects during voluntary (natural/unforced motion. The collected data from the experiments were used to develop surface fit equations that represent the position and orientation of the glenohumeral joint for a given humeral pointing direction. These equations completely quantify gross human shoulder girdle motion relative to the humerus. The equations are presented along with goodness-of-fit results that indicate the equations well approximate the motion of the human glenohumeral joint. This is the first time the motion has been quantified for the entire workspace, and the equations provide a reference against which to compare future work.

  10. Discriminative vision-based recovery and recognition of human motion

    NARCIS (Netherlands)

    Poppe, Ronald Walter

    2009-01-01

    The automatic analysis of human motion from images opens up the way for applications in the domains of security and surveillance, human-computer interaction, animation, retrieval and sports motion analysis. In this dissertation, the focus is on robust and fast human pose recovery and action recognit

  11. Perception of complex motion in humans and pigeons (Columba livia).

    Science.gov (United States)

    Nankoo, Jean-François; Madan, Christopher R; Spetch, Marcia L; Wylie, Douglas R

    2014-06-01

    In the primate visual system, local motion signals are pooled to create a global motion percept. Like primates, many birds are highly dependent on vision for their survival, yet relatively little is known about motion perception in birds. We used random-dot stimuli to investigate pigeons' ability to detect complex motion (radial, rotation, and spiral) compared to humans. Our human participants had a significantly lower threshold for rotational and radial motion when compared to spiral motion. The data from the pigeons, however, showed that the pigeons were most sensitive to rotational motion and least sensitive to radial motion, while sensitivity for spiral motion was intermediate. We followed up the pigeon results with an investigation of the effect of display aperture shape for rotational motion and velocity gradient for radial motion. We found no effect of shape of the aperture on thresholds, but did observe that radial motion containing accelerating dots improved thresholds. However, this improvement did not reach the thresholds levels observed for rotational motion. In sum, our experiments demonstrate that the pooling mechanism in the pigeon motion system is most efficient for rotation.

  12. Human motion perception: Higher-order organization

    Science.gov (United States)

    Kaiser, Mary K.; Proffitt, Dennis R.

    1990-01-01

    An overview is given of higher-order motion perception and organization. It is argued that motion is sufficient to fully specify a number of environmental properties, including: depth order, three-dimensional form, object displacement, and dynamics. A grammar of motion perception is proposed; applications of this work for display design are discussed.

  13. Society for Ambulatory Anesthesia

    Science.gov (United States)

    ... We Represent Ambulatory and Office-Based Anesthesia The Society for Ambulatory Anesthesia provides educational opportunities, encourages research ... 6620 | E-mail: info@sambahq.org Copyright | 2016 Society for Ambulatory Anesthesia Home | Search | Terms | Privacy Policy | ...

  14. Survey on Human Motion Detection In Static Background

    Directory of Open Access Journals (Sweden)

    Ida Merin Kuriakose

    2016-08-01

    Full Text Available Nowadays, computer vision has increasingly focused on building systems for observing humans and understanding their looks, activity, and behavior providing advanced interfaces for interacting with human beings, and creating models of humans for various purposes. For any of the system to function, it requires methods for detecting people from a given input video or a image. Visual analysis of human motion is presently one of the most active research topics in computer vision. Here the moving human body detection is the most important part of the human body motion analysis, thus the need of human body motion detection is to detect the moving human body from the background image in video sequences, and for the follow-up treatment like target classification, human motion tracking and behavior understanding and its effective detection plays an important role. Human motion analyses are concerned with the detection, tracking and recognition of human behaviors. According to the result of human motion detection research on video sequences, this paper presents a new algorithm for detecting human motion from a static background based on background subtraction.

  15. Electric Wheelchair Controlled by Human Body Motion Interface

    Science.gov (United States)

    Yokota, Sho; Hashimoto, Hiroshi; Ohyama, Yasuhiro; She, Jin-Hua

    This research studies the possibility of an intuitive interface for an electric wheelchair by using human body except hands. For this purpose, we focused on the human body motion which has relation to actions or behavior. This motion comes from the human stabilization function for holding expectable collapsing caused by voluntary motion. Thus this motion is considered as a kind of characteristics of human motion, and is linked to intentions unconsciously. Therefore, the interface which does not require conscious and complex motion is realized by applying this human body motion to the interface of electric wheelchair. In this paper, first, we did experiment to search a part which vividly shows the pressure change on the seat. As a result, it was confirmed that pressure change of the seat back vividly shows the human body motion. Next, we designed the prototype based on this evidence. Finally, experiment was conducted by using 10 subjects and SD method to evaluate feeling of operation. For this result, it was turned out that all subjects feel that proposed interface was intuitive, or to control at their direction. Therefore it was confirmed that human body motion interface has a possibility to be used for an interface of electric wheelchair.

  16. Modeling Human Control of Self-Motion Direction With Optic Flow and Vestibular Motion.

    Science.gov (United States)

    Zaal, Peter M T; Nieuwenhuizen, Frank M; van Paassen, Marinus M; Mulder, Max

    2013-04-01

    In this paper, we investigate the effects of visual and motion stimuli on the manual control of one's direction of self-motion. In a flight simulator, subjects conducted an active target-following disturbance-rejection task, using a compensatory display. Simulating a vehicular control task, the direction of vehicular motion was shown on the outside visual display in two ways: an explicit presentation using a symbol and an implicit presentation, namely, through the focus of radial outflow that emerges from optic flow. In addition, the effects of the relative strength of congruent vestibular motion cues were investigated. The dynamic properties of human visual and vestibular motion perception paths were modeled using a control-theoretical approach. As expected, improved tracking performance was found for the configurations that explicitly showed the direction of self-motion. The human visual time delay increased with approximately 150 ms for the optic flow conditions, relative to explicit presentations. Vestibular motion, providing higher order information on the direction of self-motion, allowed subjects to partially compensate for this visual perception delay, improving performance. Parameter estimates of the operator control model show that, with vestibular motion, the visual feedback becomes stronger, indicating that operators are more confident to act on optic flow information when congruent vestibular motion cues are present.

  17. HCUP State Ambulatory Surgery Databases (SASD) - Restricted Access Files

    Data.gov (United States)

    U.S. Department of Health & Human Services — The State Ambulatory Surgery Databases (SASD) contain the universe of hospital-based ambulatory surgery encounters in participating States. Some States include...

  18. Motion opponency and transparency in the human middle temporal area.

    Science.gov (United States)

    Garcia, Javier O; Grossman, Emily D

    2009-09-01

    Motion transparency is the perception of multiple, moving surfaces within the same retinal location (for example, a ripple on the surface of a drifting stream), and is an interesting challenge to motion models because multiple velocities must be represented within the same region of space. When these motion vectors are in opposite directions, brief in duration and spatially constrained within a very local region, the result is little or no perceived motion (motion opponency). Both motion transparency and motion opponency inhibit the firing rate of single middle temporal area (MT) neurons as compared with the preferred direction alone, but neither generally influences the firing rate of primary visual cortex neurons. Surprisingly, neuroimaging studies of human middle temporal area (hMT+) have found less activation due only to motion opponency and an increase in neural responses for motion transparency. Here we parametrically manipulate the local balance between competing motion vectors and find an interaction between motion opponency and transparency in the population blood oxygen level-dependent (BOLD) response. We find reduced BOLD amplitude for motion opponency throughout visual cortex, but weakened responses due to perceptual transparency that is most apparent only within the hMT+. We interpret our results as evidence for two distinct mechanisms mediating opponency and transparency.

  19. Ubiquitous human upper-limb motion estimation using wearable sensors.

    Science.gov (United States)

    Zhang, Zhi-Qiang; Wong, Wai-Choong; Wu, Jian-Kang

    2011-07-01

    Human motion capture technologies have been widely used in a wide spectrum of applications, including interactive game and learning, animation, film special effects, health care, navigation, and so on. The existing human motion capture techniques, which use structured multiple high-resolution cameras in a dedicated studio, are complicated and expensive. With the rapid development of microsensors-on-chip, human motion capture using wearable microsensors has become an active research topic. Because of the agility in movement, upper-limb motion estimation has been regarded as the most difficult problem in human motion capture. In this paper, we take the upper limb as our research subject and propose a novel ubiquitous upper-limb motion estimation algorithm, which concentrates on modeling the relationship between upper-arm movement and forearm movement. A link structure with 5 degrees of freedom (DOF) is proposed to model the human upper-limb skeleton structure. Parameters are defined according to Denavit-Hartenberg convention, forward kinematics equations are derived, and an unscented Kalman filter is deployed to estimate the defined parameters. The experimental results have shown that the proposed upper-limb motion capture and analysis algorithm outperforms other fusion methods and provides accurate results in comparison to the BTS optical motion tracker.

  20. Sensing human hand motions for controlling dexterous robots

    Science.gov (United States)

    Marcus, Beth A.; Churchill, Philip J.; Little, Arthur D.

    1988-01-01

    The Dexterous Hand Master (DHM) system is designed to control dexterous robot hands such as the UTAH/MIT and Stanford/JPL hands. It is the first commercially available device which makes it possible to accurately and confortably track the complex motion of the human finger joints. The DHM is adaptable to a wide variety of human hand sizes and shapes, throughout their full range of motion.

  1. Using Human Motion Intensity as Input for Urban Design

    DEFF Research Database (Denmark)

    Poulsen, Esben Skouboe; Andersen, Hans Jørgen; Gade, Rikke;

    2012-01-01

    of a town square, human occupancy and motion intensities are used to generate situated or topologies presenting new adaptive methods for urban design. These methods incorporate local or as design drivers for canopy, pavement and furniture layout. The urban design solution may be congured due to various......This paper presents a study investigating the potential use of human motion intensities as input for parametric urban design. Through a computer vision analysis of thermal images, motion intensity maps are generated and utilized as design drivers for urban design patterns; and, through a case study...

  2. Biodynamics of deformable human body motion

    Science.gov (United States)

    Strauss, A. M.; Huston, R. L.

    1976-01-01

    The objective is to construct a framework wherein the various models of human biomaterials fit in order to describe the biodynamic response of the human body. The behavior of the human body in various situations, from low frequency, low amplitude vibrations to impact loadings in automobile and aircraft crashes, is very complicated with respect to all aspects of the problem: materials, geometry and dynamics. The materials problem is the primary concern, but the materials problem is intimately connected with geometry and dynamics.

  3. Human motion estimation with multiple frequency modulated continuous wave radars

    NARCIS (Netherlands)

    Dorp, Ph. van; Groen, F.C.A.

    2010-01-01

    Human motion estimation is an important issue in automotive, security or home automation applications. Radar systems are well suited for this because they are robust, are independent of day or night conditions and have accurate range and speed domain. The human response in a radar range-speed-time m

  4. National Ambulatory Medical Care Survey (NAMCS)

    Data.gov (United States)

    U.S. Department of Health & Human Services — The National Ambulatory Medical Care Survey (NAMCS) is a national survey designed to meet the need for objective, reliable information about the provision and use of...

  5. An efficient stochastic framework for 3D human motion tracking

    Science.gov (United States)

    Ni, Bingbing; Winkler, Stefan; Kassim, Ashraf Ali

    2008-02-01

    In this paper, we present a stochastic framework for articulated 3D human motion tracking. Tracking full body human motion is a challenging task, because the tracking performance normally suffers from several issues such as self-occlusion, foreground segmentation noise and high computational cost. In our work, we use explicit 3D reconstructions of the human body based on a visual hull algorithm as our system input, which effectively eliminates self-occlusion. To improve tracking efficiency as well as robustness, we use a Kalman particle filter framework based on an interacting multiple model (IMM). The posterior density is approximated by a set of weighted particles, which include both sample means and covariances. Therefore, tracking is equivalent to searching the maximum a posteriori (MAP) of the probability distribution. During Kalman filtering, several dynamical models of human motion (e.g., zero order, first order) are assumed which interact with each other for more robust tracking results. Our measurement step is performed by a local optimization method using simulated physical force/moment for 3D registration. The likelihood function is designed to be the fitting score between the reconstructed human body and our 3D human model, which is composed of a set of cylinders. This proposed tracking framework is tested on a real motion sequence. Our experimental results show that the proposed method improves the sampling efficiency compared with most particle filter based methods and achieves high tracking accuracy.

  6. Inertial and magnetic sensing of human motion

    NARCIS (Netherlands)

    Roetenberg, Daniel

    2006-01-01

    Movement and posture tracking of the human body is of great interest in many different disciplines such as monitoring of activities of daily living, assessment of working load in ergonomics studies, measurement of neurological disorders, computer animation, and virtual reality applications. This the

  7. Recurrence plots and recurrence quantification analysis of human motion data

    Science.gov (United States)

    Josiński, Henryk; Michalczuk, Agnieszka; Świtoński, Adam; Szczesna, Agnieszka; Wojciechowski, Konrad

    2016-06-01

    The authors present exemplary application of recurrence plots, cross recurrence plots and recurrence quantification analysis for the purpose of exploration of experimental time series describing selected aspects of human motion. Time series were extracted from treadmill gait sequences which were recorded in the Human Motion Laboratory (HML) of the Polish-Japanese Academy of Information Technology in Bytom, Poland by means of the Vicon system. Analysis was focused on the time series representing movements of hip, knee, ankle and wrist joints in the sagittal plane.

  8. An Embedded System for Tracking Human Motion and Humanoid Interfaces

    Directory of Open Access Journals (Sweden)

    Ming-June Tsai

    2012-12-01

    Full Text Available The aim of this research is using embedded CPU to develop a human motion tracking system and construct a motion replication interface for a humanoid robot. In the motion tracking system, we use a CPLD (Complex Programmable Logic Device which is built in a central control unit (CCU to generate synchronous signals for all the periphery devices and control the data flow from CCD boards to a PC via a USB chip. An embedded DSP on the CCD board is adopted to control the CCD exposure and conduct image processing. The peak position of exposure was computed by the on-board DSP within sub-pixel accuracy. In the construction of a motion replication interface, the same CCU is used to generate the PWM signals to drive the motors of the humanoid robot. All of the respective firmware coding methods are discussed in this article.

  9. Indoor Localization Algorithms for an Ambulatory Human Operated 3D Mobile Mapping System

    Directory of Open Access Journals (Sweden)

    Nicholas Corso

    2013-12-01

    Full Text Available Indoor localization and mapping is an important problem with many applications such as emergency response, architectural modeling, and historical preservation. In this paper, we develop an automatic, off-line pipeline for metrically accurate, GPS-denied, indoor 3D mobile mapping using a human-mounted backpack system consisting of a variety of sensors. There are three novel contributions in our proposed mapping approach. First, we present an algorithm which automatically detects loop closure constraints from an occupancy grid map. In doing so, we ensure that constraints are detected only in locations that are well conditioned for scan matching. Secondly, we address the problem of scan matching with poor initial condition by presenting an outlier-resistant, genetic scan matching algorithm that accurately matches scans despite a poor initial condition. Third, we present two metrics based on the amount and complexity of overlapping geometry in order to vet the estimated loop closure constraints. By doing so, we automatically prevent erroneous loop closures from degrading the accuracy of the reconstructed trajectory. The proposed algorithms are experimentally verified using both controlled and real-world data. The end-to-end system performance is evaluated using 100 surveyed control points in an office environment and obtains a mean accuracy of 10 cm. Experimental results are also shown on three additional datasets from real world environments including a 1500 meter trajectory in a warehouse sized retail shopping center.

  10. Indoor Localization Algorithms for an Ambulatory Human Operated 3D Mobile Mapping System

    Energy Technology Data Exchange (ETDEWEB)

    Corso, N; Zakhor, A

    2013-12-03

    Indoor localization and mapping is an important problem with many applications such as emergency response, architectural modeling, and historical preservation. In this paper, we develop an automatic, off-line pipeline for metrically accurate, GPS-denied, indoor 3D mobile mapping using a human-mounted backpack system consisting of a variety of sensors. There are three novel contributions in our proposed mapping approach. First, we present an algorithm which automatically detects loop closure constraints from an occupancy grid map. In doing so, we ensure that constraints are detected only in locations that are well conditioned for scan matching. Secondly, we address the problem of scan matching with poor initial condition by presenting an outlier-resistant, genetic scan matching algorithm that accurately matches scans despite a poor initial condition. Third, we present two metrics based on the amount and complexity of overlapping geometry in order to vet the estimated loop closure constraints. By doing so, we automatically prevent erroneous loop closures from degrading the accuracy of the reconstructed trajectory. The proposed algorithms are experimentally verified using both controlled and real-world data. The end-to-end system performance is evaluated using 100 surveyed control points in an office environment and obtains a mean accuracy of 10 cm. Experimental results are also shown on three additional datasets from real world environments including a 1500 meter trajectory in a warehouse sized retail shopping center.

  11. A Self-Powered Insole for Human Motion Recognition

    Science.gov (United States)

    Han, Yingzhou; Cao, Yalu; Zhao, Jingjing; Yin, Yajiang; Ye, Liangchen; Wang, Xiaofeng; You, Zheng

    2016-01-01

    Biomechanical energy harvesting is a feasible solution for powering wearable sensors by directly driving electronics or acting as wearable self-powered sensors. A wearable insole that not only can harvest energy from foot pressure during walking but also can serve as a self-powered human motion recognition sensor is reported. The insole is designed as a sandwich structure consisting of two wavy silica gel film separated by a flexible piezoelectric foil stave, which has higher performance compared with conventional piezoelectric harvesters with cantilever structure. The energy harvesting insole is capable of driving some common electronics by scavenging energy from human walking. Moreover, it can be used to recognize human motion as the waveforms it generates change when people are in different locomotion modes. It is demonstrated that different types of human motion such as walking and running are clearly classified by the insole without any external power source. This work not only expands the applications of piezoelectric energy harvesters for wearable power supplies and self-powered sensors, but also provides possible approaches for wearable self-powered human motion monitoring that is of great importance in many fields such as rehabilitation and sports science. PMID:27649188

  12. Marker-Based Human Motion Capture in Multiview Sequences

    Directory of Open Access Journals (Sweden)

    Canton-Ferrer Cristian

    2010-01-01

    Full Text Available This paper presents a low-cost real-time alternative to available commercial human motion capture systems. First, a set of distinguishable markers are placed on several human body landmarks, and the scene is captured by a number of calibrated and synchronized cameras. In order to establish a physical relation among markers, a human body model is defined. Markers are detected on all camera views and delivered as the input of an annealed particle filter scheme where every particle encodes an instance of the pose of the body model to be estimated. Likelihood between particles and input data is performed through the robust generalized symmetric epipolar distance and kinematic constrains are enforced in the propagation step towards avoiding impossible poses. Tests over the HumanEva annotated data set yield quantitative results showing the effectiveness of the proposed algorithm. Results over sequences involving fast and complex motions are also presented.

  13. 3D Reconstruction of Human Motion from Monocular Image Sequences.

    Science.gov (United States)

    Wandt, Bastian; Ackermann, Hanno; Rosenhahn, Bodo

    2016-08-01

    This article tackles the problem of estimating non-rigid human 3D shape and motion from image sequences taken by uncalibrated cameras. Similar to other state-of-the-art solutions we factorize 2D observations in camera parameters, base poses and mixing coefficients. Existing methods require sufficient camera motion during the sequence to achieve a correct 3D reconstruction. To obtain convincing 3D reconstructions from arbitrary camera motion, our method is based on a-priorly trained base poses. We show that strong periodic assumptions on the coefficients can be used to define an efficient and accurate algorithm for estimating periodic motion such as walking patterns. For the extension to non-periodic motion we propose a novel regularization term based on temporal bone length constancy. In contrast to other works, the proposed method does not use a predefined skeleton or anthropometric constraints and can handle arbitrary camera motion. We achieve convincing 3D reconstructions, even under the influence of noise and occlusions. Multiple experiments based on a 3D error metric demonstrate the stability of the proposed method. Compared to other state-of-the-art methods our algorithm shows a significant improvement.

  14. Human Motion Video Analysis in Clinical Practice (Review)

    OpenAIRE

    V.V. Borzikov; N.N. Rukina; O.V. Vorobyova; A.N. Kuznetsov; A. N. Belova

    2015-01-01

    The development of new rehabilitation approaches to neurological and traumatological patients requires understanding of normal and pathological movement patterns. Biomechanical analysis of video images is the most accurate method of investigation and quantitative assessment of human normal and pathological locomotion. The review of currently available methods and systems of optical human motion analysis used in clinical practice is presented here. Short historical background is provi...

  15. Coupled motions direct electrons along human microsomal P450 Chains.

    Directory of Open Access Journals (Sweden)

    Christopher R Pudney

    2011-12-01

    Full Text Available Protein domain motion is often implicated in biological electron transfer, but the general significance of motion is not clear. Motion has been implicated in the transfer of electrons from human cytochrome P450 reductase (CPR to all microsomal cytochrome P450s (CYPs. Our hypothesis is that tight coupling of motion with enzyme chemistry can signal "ready and waiting" states for electron transfer from CPR to downstream CYPs and support vectorial electron transfer across complex redox chains. We developed a novel approach to study the time-dependence of dynamical change during catalysis that reports on the changing conformational states of CPR. FRET was linked to stopped-flow studies of electron transfer in CPR that contains donor-acceptor fluorophores on the enzyme surface. Open and closed states of CPR were correlated with key steps in the catalytic cycle which demonstrated how redox chemistry and NADPH binding drive successive opening and closing of the enzyme. Specifically, we provide evidence that reduction of the flavin moieties in CPR induces CPR opening, whereas ligand binding induces CPR closing. A dynamic reaction cycle was created in which CPR optimizes internal electron transfer between flavin cofactors by adopting closed states and signals "ready and waiting" conformations to partner CYP enzymes by adopting more open states. This complex, temporal control of enzyme motion is used to catalyze directional electron transfer from NADPH→FAD→FMN→heme, thereby facilitating all microsomal P450-catalysed reactions. Motions critical to the broader biological functions of CPR are tightly coupled to enzyme chemistry in the human NADPH-CPR-CYP redox chain. That redox chemistry alone is sufficient to drive functionally necessary, large-scale conformational change is remarkable. Rather than relying on stochastic conformational sampling, our study highlights a need for tight coupling of motion to enzyme chemistry to give vectorial electron

  16. Human motion behavior while interacting with an industrial robot.

    Science.gov (United States)

    Bortot, Dino; Ding, Hao; Antonopolous, Alexandros; Bengler, Klaus

    2012-01-01

    Human workers and industrial robots both have specific strengths within industrial production. Advantageously they complement each other perfectly, which leads to the development of human-robot interaction (HRI) applications. Bringing humans and robots together in the same workspace may lead to potential collisions. The avoidance of such is a central safety requirement. It can be realized with sundry sensor systems, all of them decelerating the robot when the distance to the human decreases alarmingly and applying the emergency stop, when the distance becomes too small. As a consequence, the efficiency of the overall systems suffers, because the robot has high idle times. Optimized path planning algorithms have to be developed to avoid that. The following study investigates human motion behavior in the proximity of an industrial robot. Three different kinds of encounters between the two entities under three robot speed levels are prompted. A motion tracking system is used to capture the motions. Results show, that humans keep an average distance of about 0,5m to the robot, when the encounter occurs. Approximation of the workbenches is influenced by the robot in ten of 15 cases. Furthermore, an increase of participants' walking velocity with higher robot velocities is observed.

  17. An Exoskeleton Robot for Human Forearm and Wrist Motion Assist

    Science.gov (United States)

    Ranathunga Arachchilage Ruwan Chandra Gopura; Kiguchi, Kazuo

    The exoskeleton robot is worn by the human operator as an orthotic device. Its joints and links correspond to those of the human body. The same system operated in different modes can be used for different fundamental applications; a human-amplifier, haptic interface, rehabilitation device and assistive device sharing a portion of the external load with the operator. We have been developing exoskeleton robots for assisting the motion of physically weak individuals such as elderly or slightly disabled in daily life. In this paper, we propose a three degree of freedom (3DOF) exoskeleton robot (W-EXOS) for the forearm pronation/ supination motion, wrist flexion/extension motion and ulnar/radial deviation. The paper describes the wrist anatomy toward the development of the exoskeleton robot, the hardware design of the exoskeleton robot and EMG-based control method. The skin surface electromyographic (EMG) signals of muscles in forearm of the exoskeletons' user and the hand force/forearm torque are used as input information for the controller. By applying the skin surface EMG signals as main input signals to the controller, automatic control of the robot can be realized without manipulating any other equipment. Fuzzy control method has been applied to realize the natural and flexible motion assist. Experiments have been performed to evaluate the proposed exoskeleton robot and its control method.

  18. Motion Sickness: A Study of Its Effects on Human Physiology.

    Science.gov (United States)

    1987-12-01

    SICKNESS: A STUDY OF ITS EFFECTS ON HUMAN PHYSIOLOGY THESIS Pierre J. Gaudreault Captain, USAF AFIT/GE/ENG/87D- 2 0 TO STEC TEo VN;FB 1 0 1988...ENG/87D-20 MOTION SICKNESS: A STUDY OF ITS EFFECTS ON HUMAN PHYSIOLOGY THESIS Pierre J. Gaudreault Captain, USAF AFIT/GE/ENG/87D-20 Approved for public...SICKNESS: A STUDY OF ITS EFFECTS ON HUMAN PHYSIOLOGY THESIS Presented to the Faculty of the School of Engineering of the Air Force Institute of Technology

  19. Comparing biological motion perception in two distinct human societies.

    Directory of Open Access Journals (Sweden)

    Pierre Pica

    Full Text Available Cross cultural studies have played a pivotal role in elucidating the extent to which behavioral and mental characteristics depend on specific environmental influences. Surprisingly, little field research has been carried out on a fundamentally important perceptual ability, namely the perception of biological motion. In this report, we present details of studies carried out with the help of volunteers from the Mundurucu indigene, a group of people native to Amazonian territories in Brazil. We employed standard biological motion perception tasks inspired by over 30 years of laboratory research, in which observers attempt to decipher the walking direction of point-light (PL humans and animals. Do our effortless skills at perceiving biological activity from PL animations, as revealed in laboratory settings, generalize to people who have never before seen representational depictions of human and animal activity? The results of our studies provide a clear answer to this important, previously unanswered question. Mundurucu observers readily perceived the coherent, global shape depicted in PL walkers, and experienced the classic inversion effects that are typically found when such stimuli are turned upside down. In addition, their performance was in accord with important recent findings in the literature, in the abundant ease with which they extracted direction information from local motion invariants alone. We conclude that the effortless, veridical perception of PL biological motion is a spontaneous and universal perceptual ability, occurring both inside and outside traditional laboratory environments.

  20. Cloth Simulation Based Motion Capture of Dressed Humans

    Science.gov (United States)

    Hasler, Nils; Rosenhahn, Bodo; Seidel, Hans-Peter

    Commonly, marker based as well as markerless motion capture systems assume that the tracked person is wearing tightly fitting clothes. Unfortunately, this restriction cannot be satisfied in many situations and most preexisting video data does not adhere to it either. In this work we propose a graphics based vision approach for tracking humans markerlessly without making this assumption. Instead, a physically based simulation of the clothing the tracked person is wearing is used to guide the tracking algorithm.

  1. Neural correlates of induced motion perception in the human brain.

    Science.gov (United States)

    Takemura, Hiromasa; Ashida, Hiroshi; Amano, Kaoru; Kitaoka, Akiyoshi; Murakami, Ikuya

    2012-10-10

    A physically stationary stimulus surrounded by a moving stimulus appears to move in the opposite direction. There are similarities between the characteristics of this phenomenon of induced motion and surround suppression of directionally selective neurons in the brain. Here, functional magnetic resonance imaging was used to investigate the link between the subjective perception of induced motion and cortical activity. The visual stimuli consisted of a central drifting sinusoid surrounded by a moving random-dot pattern. The change in cortical activity in response to changes in speed and direction of the central stimulus was measured. The human cortical area hMT+ showed the greatest activation when the central stimulus moved at a fast speed in the direction opposite to that of the surround. More importantly, the activity in this area was the lowest when the central stimulus moved in the same direction as the surround and at a speed such that the central stimulus appeared to be stationary. The results indicate that the activity in hMT+ is related to perceived speed modulated by induced motion rather than to physical speed or a kinetic boundary. Early visual areas (V1, V2, V3, and V3A) showed a similar pattern; however, the relationship to perceived speed was not as clear as that in hMT+. These results suggest that hMT+ may be a neural correlate of induced motion perception and play an important role in contrasting motion signals in relation to their surrounding context and adaptively modulating our motion perception depending on the spatial context.

  2. Motion

    CERN Document Server

    Graybill, George

    2007-01-01

    Take the mystery out of motion. Our resource gives you everything you need to teach young scientists about motion. Students will learn about linear, accelerating, rotating and oscillating motion, and how these relate to everyday life - and even the solar system. Measuring and graphing motion is easy, and the concepts of speed, velocity and acceleration are clearly explained. Reading passages, comprehension questions, color mini posters and lots of hands-on activities all help teach and reinforce key concepts. Vocabulary and language are simplified in our resource to make them accessible to str

  3. Camera systems in human motion analysis for biomedical applications

    Science.gov (United States)

    Chin, Lim Chee; Basah, Shafriza Nisha; Yaacob, Sazali; Juan, Yeap Ewe; Kadir, Aida Khairunnisaa Ab.

    2015-05-01

    Human Motion Analysis (HMA) system has been one of the major interests among researchers in the field of computer vision, artificial intelligence and biomedical engineering and sciences. This is due to its wide and promising biomedical applications, namely, bio-instrumentation for human computer interfacing and surveillance system for monitoring human behaviour as well as analysis of biomedical signal and image processing for diagnosis and rehabilitation applications. This paper provides an extensive review of the camera system of HMA, its taxonomy, including camera types, camera calibration and camera configuration. The review focused on evaluating the camera system consideration of the HMA system specifically for biomedical applications. This review is important as it provides guidelines and recommendation for researchers and practitioners in selecting a camera system of the HMA system for biomedical applications.

  4. Automatic Video-based Analysis of Human Motion

    DEFF Research Database (Denmark)

    Fihl, Preben

    received great interest from both industry and research communities. The focus of this thesis is on video-based analysis of human motion and the thesis presents work within three overall topics, namely foreground segmentation, action recognition, and human pose estimation. Foreground segmentation is often...... foreground camouflage, shadows, and moving backgrounds. The method continuously updates the background model to maintain high quality segmentation over long periods of time. Within action recognition the thesis presents work on both recognition of arm gestures and gait types. A key-frame based approach...... range of gait which deals with an inherent ambiguity of gait types. Human pose estimation does not target a specific action but is considered as a good basis for the recognition of any action. The pose estimation work presented in this thesis is mainly concerned with the problems of interacting people...

  5. Development of enhanced piezoelectric energy harvester induced by human motion.

    Science.gov (United States)

    Minami, Y; Nakamachi, E

    2012-01-01

    In this study, a high frequency piezoelectric energy harvester converted from the human low vibrated motion energy was newly developed. This hybrid energy harvester consists of the unimorph piezoelectric cantilever and a couple of permanent magnets. One magnet was attached at the end of cantilever, and the counterpart magnet was set at the end of the pendulum. The mechanical energy provided through the human walking motion, which is a typical ubiquitous presence of vibration, is converted to the electric energy via the piezoelectric cantilever vibration system. At first, we studied the energy convert mechanism and the performance of our energy harvester, where the resonance free vibration of unimorph cantilever with one permanent magnet under a rather high frequency was induced by the artificial low frequency vibration. The counterpart magnet attached on the pendulum. Next, we equipped the counterpart permanent magnet pendulum, which was fluctuated under a very low frequency by the human walking, and the piezoelectric cantilever, which had the permanent magnet at the end. The low-to-high frequency convert "hybrid system" can be characterized as an enhanced energy harvest one. We examined and obtained maximum values of voltage and power in this system, as 1.2V and 1.2 µW. Those results show the possibility to apply for the energy harvester in the portable and implantable Bio-MEMS devices.

  6. Human Ensuing Self-balancing Automaton Based on Motion Sensor

    Directory of Open Access Journals (Sweden)

    R. Kishhanth

    2014-10-01

    Full Text Available Travel has become one among rudimentary necessities for every individual. Handling baggage plays an important role while travelling and for typical nomads it is cumbersome when heavy. With the proposed concept which will be dealt in this study, the baggage need not be pulled by us; it just follows us detecting our presence. Hence, the baggage is simply nothing but a robot. Prototype of motion sensor based human following robot that can balance itself in two wheels, thus behaving as a suitcase with intelligence and hence named Smart Suitcase. Concept of inverted pendulum helps in balancing. Regenerative power saving is established, when on its normal movement by the user wherein the saved power can be used for charging mobiles, laptops, torch lights etc. (low voltage applications. Passive infrared sensors fed with inbuilt intelligence in responding only to human presence helps this robot get even smarter.

  7. Generating action descriptions from statistically integrated representations of human motions and sentences.

    Science.gov (United States)

    Takano, Wataru; Kusajima, Ikuo; Nakamura, Yoshihiko

    2016-08-01

    It is desirable for robots to be able to linguistically understand human actions during human-robot interactions. Previous research has developed frameworks for encoding human full body motion into model parameters and for classifying motion into specific categories. For full understanding, the motion categories need to be connected to the natural language such that the robots can interpret human motions as linguistic expressions. This paper proposes a novel framework for integrating observation of human motion with that of natural language. This framework consists of two models; the first model statistically learns the relations between motions and their relevant words, and the second statistically learns sentence structures as word n-grams. Integration of these two models allows robots to generate sentences from human motions by searching for words relevant to the motion using the first model and then arranging these words in appropriate order using the second model. This allows making sentences that are the most likely to be generated from the motion. The proposed framework was tested on human full body motion measured by an optical motion capture system. In this, descriptive sentences were manually attached to the motions, and the validity of the system was demonstrated.

  8. An analysis of human motion detection systems use during elder exercise routines.

    Science.gov (United States)

    Alexander, Gregory L; Havens, Timothy C; Rantz, Marilyn; Keller, James; Casanova Abbott, Carmen

    2010-03-01

    Human motion analysis provides motion pattern and body pose estimations. This study integrates computer-vision techniques and explores a markerless human motion analysis system. Using human-computer interaction (HCI) methods and goals, researchers use a computer interface to provide feedback about range of motion to users. A total of 35 adults aged 65 and older perform three exercises in a public gym while human motion capture methods are used. Following exercises, participants are shown processed human motion images captured during exercises on a customized interface. Standardized questionnaires are used to elicit responses from users during interactions with the interface. A matrix of HCI goals (effectiveness, efficiency, and user satisfaction) and emerging themes are used to describe interactions. Sixteen users state the interface would be useful, but not necessarily for safety purposes. Users want better image quality, when expectations are matched satisfaction increases, and unclear meaning of motion measures decreases satisfaction.

  9. Electrical Properties of PPy-Coated Conductive Fabrics for Human Joint Motion Monitoring

    Directory of Open Access Journals (Sweden)

    Jiyong Hu

    2016-03-01

    Full Text Available Body motion signals indicate several pathological features of the human body, and a wearable human motion monitoring system can respond to human joint motion signal in real time, thereby enabling the prevention and treatment of some diseases. Because conductive fabrics can be well integrated with the garment, they are ideal as a sensing element of wearable human motion monitoring systems. This study prepared polypyrrole conductive fabric by in situ polymerization, and the anisotropic property of the conductive fabric resistance, resistance–strain relationship, and the relationship between resistance and the human knee and elbow movements are discussed preliminarily.

  10. Humans perceive object motion in world coordinates during obstacle avoidance.

    Science.gov (United States)

    Fajen, Brett R; Parade, Melissa S; Matthis, Jonathan S

    2013-07-25

    A fundamental question about locomotion in the presence of moving objects is whether movements are guided based upon perceived object motion in an observer-centered or world-centered reference frame. The former captures object motion relative to the moving observer and depends on both observer and object motion. The latter captures object motion relative to the stationary environment and is independent of observer motion. Subjects walked through a virtual environment (VE) viewed through a head-mounted display and indicated whether they would pass in front of or behind a moving obstacle that was on course to cross their future path. Subjects' movement through the VE was manipulated such that object motion in observer coordinates was affected while object motion in world coordinates was the same. We found that when moving observers choose routes around moving obstacles, they rely on object motion perceived in world coordinates. This entails a process, which has been called flow parsing (Rushton & Warren, 2005; Warren & Rushton, 2009a), that recovers the component of optic flow due to object motion independent of self-motion. We found that when self-motion is real and actively generated, the process by which object motion is recovered relies on both visual and nonvisual information to factor out the influence of self-motion. The remaining component contains information about object motion in world coordinates that is needed to guide locomotion.

  11. The role of human ventral visual cortex in motion perception.

    Science.gov (United States)

    Gilaie-Dotan, Sharon; Saygin, Ayse P; Lorenzi, Lauren J; Egan, Ryan; Rees, Geraint; Behrmann, Marlene

    2013-09-01

    Visual motion perception is fundamental to many aspects of visual perception. Visual motion perception has long been associated with the dorsal (parietal) pathway and the involvement of the ventral 'form' (temporal) visual pathway has not been considered critical for normal motion perception. Here, we evaluated this view by examining whether circumscribed damage to ventral visual cortex impaired motion perception. The perception of motion in basic, non-form tasks (motion coherence and motion detection) and complex structure-from-motion, for a wide range of motion speeds, all centrally displayed, was assessed in five patients with a circumscribed lesion to either the right or left ventral visual pathway. Patients with a right, but not with a left, ventral visual lesion displayed widespread impairments in central motion perception even for non-form motion, for both slow and for fast speeds, and this held true independent of the integrity of areas MT/V5, V3A or parietal regions. In contrast with the traditional view in which only the dorsal visual stream is critical for motion perception, these novel findings implicate a more distributed circuit in which the integrity of the right ventral visual pathway is also necessary even for the perception of non-form motion.

  12. The Unrealised Value of Human Motion--"Moving Back to Movement!"

    Science.gov (United States)

    Dodd, Graham D.

    2015-01-01

    The unrealised and under-estimated value of human motion in human development, functioning and learning is the central cause for its devaluation in Australian society. This paper provides a greater insight into why human motion has high value and should be utilised more in advocacy and implementation in health and education, particularly school…

  13. A Real-Time Model-Based Human Motion Tracking and Analysis for Human-Computer Interface Systems

    Directory of Open Access Journals (Sweden)

    Chung-Lin Huang

    2004-09-01

    Full Text Available This paper introduces a real-time model-based human motion tracking and analysis method for human computer interface (HCI. This method tracks and analyzes the human motion from two orthogonal views without using any markers. The motion parameters are estimated by pattern matching between the extracted human silhouette and the human model. First, the human silhouette is extracted and then the body definition parameters (BDPs can be obtained. Second, the body animation parameters (BAPs are estimated by a hierarchical tritree overlapping searching algorithm. To verify the performance of our method, we demonstrate different human posture sequences and use hidden Markov model (HMM for posture recognition testing.

  14. Predictive coding for motion stimuli in human early visual cortex

    NARCIS (Netherlands)

    Schellekens, Wouter; van Wezel, Richard J A; Petridou, Natalia; Ramsey, Nick F.; Raemaekers, Mathijs

    2016-01-01

    The current study investigates if early visual cortical areas, V1, V2 and V3, use predictive coding to process motion information. Previous studies have reported biased visual motion responses at locations where novel visual information was presented (i.e., the motion trailing edge), which is plausi

  15. Predictive coding for motion stimuli in human early visual cortex

    NARCIS (Netherlands)

    Schellekens, Wouter; Wezel, van Richard J.A.; Petridou, Natalia; Ramsey, Nick F.; Raemeakers, Mathijs; Zaborszky, L.; Zilles, K.

    2014-01-01

    The current study investigates if early visual cortical areas, V1, V2 and V3, use predictive coding to process motion information. Previous studies have reported biased visual motion responses at locations where novel visual information was presented (i.e., the motion trailing edge), which is plausi

  16. Implied motion because of instability in Hokusai Manga activates the human motion-sensitive extrastriate visual cortex: an fMRI study of the impact of visual art.

    Science.gov (United States)

    Osaka, Naoyuki; Matsuyoshi, Daisuke; Ikeda, Takashi; Osaka, Mariko

    2010-03-10

    The recent development of cognitive neuroscience has invited inference about the neurosensory events underlying the experience of visual arts involving implied motion. We report functional magnetic resonance imaging study demonstrating activation of the human extrastriate motion-sensitive cortex by static images showing implied motion because of instability. We used static line-drawing cartoons of humans by Hokusai Katsushika (called 'Hokusai Manga'), an outstanding Japanese cartoonist as well as famous Ukiyoe artist. We found 'Hokusai Manga' with implied motion by depicting human bodies that are engaged in challenging tonic posture significantly activated the motion-sensitive visual cortex including MT+ in the human extrastriate cortex, while an illustration that does not imply motion, for either humans or objects, did not activate these areas under the same tasks. We conclude that motion-sensitive extrastriate cortex would be a critical region for perception of implied motion in instability.

  17. High prevalence of human papillomavirus (HPV) in oral mucosal lesions of patients at the Ambulatory of Oral Diagnosis of the Federal University of Sergipe, Northeastern Brazil

    Science.gov (United States)

    RIBEIRO, Mariana Goveia Melo; MARCOLINO, Larissa Doddi; RAMOS, Bruna Ribeiro de Andrade; MIRANDA, Elaine Alves; TRENTO, Cleverson Luciano; JAIN, Sona; GURGEL, Ricardo Queiroz; da SILVA, Márcia Guimarães; DOLABELLA, Silvio Santana

    2017-01-01

    Abstract The role of human papillomavirus (HPV) in oral carcinogenesis is still controversial as detection rates of the virus in oral cavity reported in the literature varies greatly. Objective The aim of this study was to evaluate the frequency of HPV infection and its genotypes in patients with oral lesions at the Ambulatory of Oral Diagnosis of the Federal University of Sergipe, Brazil. Material and Methods We conducted a molecular study with 21 patients (15 females) aged from two to 83 years with clinically detectable oral lesions. Samples were collected through exfoliation of lesions and HPV-DNA was identified using MY09/11 and GP5+/6+ primers. Genotyping was performed by multiplex PCR. Results Benign, premalignant and malignant lesions were diagnosed by histopathology. HPV was detected in 17 samples. Of these, HPV-6 was detected in 10 samples, HPV-18 in four and HPV-16 in one sample. When samples were categorized by lesion types, HPV was detected in two papilloma cases (2/3), five carcinomas (5/6), one hyperplasia (1/1) and nine dysplasia cases (9/11). Conclusion Unlike other studies in the literature, we reported high occurrence of HPV in oral lesions. Further studies are required to enhance the comprehension of natural history of oral lesions. PMID:28198978

  18. Interactions between motion and form processing in the human visual system

    Directory of Open Access Journals (Sweden)

    George eMather

    2013-05-01

    Full Text Available The predominant view of motion and form processing in the human visual system assumes that these two attributes are handled by separate and independent modules. Motion processing involves filtering by direction-selective sensors, followed by integration to solve the aperture problem. Form processing involves filtering by orientation-selective and size-selective receptive fields, followed by integration to encode object shape. It has long been known that motion signals can influence form processing in the well-known Gestalt principle of common fate; texture elements which share a common motion property are grouped into a single contour or texture region. However recent research in psychophysics and neuroscience indicates that the influence of form signals on motion processing is more extensive than previously thought. First, the salience and apparent direction of moving lines depends on how the local orientation and direction of motion combine to match the receptive field properties of motion-selective neurons. Second, orientation signals generated by ‘motion-streaks’ influence motion processing; motion sensitivity, apparent direction and adaptation are affected by simultaneously present orientation signals. Third, form signals generated by human body shape influence biological motion processing, as revealed by studies using point-light motion stimuli. Thus form-motion integration seems to occur at several different levels of cortical processing, from V1 to STS.

  19. Human joint motion estimation for electromyography (EMG)-based dynamic motion control.

    Science.gov (United States)

    Zhang, Qin; Hosoda, Ryo; Venture, Gentiane

    2013-01-01

    This study aims to investigate a joint motion estimation method from Electromyography (EMG) signals during dynamic movement. In most EMG-based humanoid or prosthetics control systems, EMG features were directly or indirectly used to trigger intended motions. However, both physiological and nonphysiological factors can influence EMG characteristics during dynamic movements, resulting in subject-specific, non-stationary and crosstalk problems. Particularly, when motion velocity and/or joint torque are not constrained, joint motion estimation from EMG signals are more challenging. In this paper, we propose a joint motion estimation method based on muscle activation recorded from a pair of agonist and antagonist muscles of the joint. A linear state-space model with multi input single output is proposed to map the muscle activity to joint motion. An adaptive estimation method is proposed to train the model. The estimation performance is evaluated in performing a single elbow flexion-extension movement in two subjects. All the results in two subjects at two load levels indicate the feasibility and suitability of the proposed method in joint motion estimation. The estimation root-mean-square error is within 8.3% ∼ 10.6%, which is lower than that being reported in several previous studies. Moreover, this method is able to overcome subject-specific problem and compensate non-stationary EMG properties.

  20. Human torso phantom for imaging of heart with realistic modes of cardiac and respiratory motion

    Science.gov (United States)

    Boutchko, Rostyslav; Balakrishnan, Karthikayan; Gullberg, Grant T; O& #x27; Neil, James P

    2013-09-17

    A human torso phantom and its construction, wherein the phantom mimics respiratory and cardiac cycles in a human allowing acquisition of medical imaging data under conditions simulating patient cardiac and respiratory motion.

  1. Human body motion capture from multi-image video sequences

    Science.gov (United States)

    D'Apuzzo, Nicola

    2003-01-01

    In this paper is presented a method to capture the motion of the human body from multi image video sequences without using markers. The process is composed of five steps: acquisition of video sequences, calibration of the system, surface measurement of the human body for each frame, 3-D surface tracking and tracking of key points. The image acquisition system is currently composed of three synchronized progressive scan CCD cameras and a frame grabber which acquires a sequence of triplet images. Self calibration methods are applied to gain exterior orientation of the cameras, the parameters of internal orientation and the parameters modeling the lens distortion. From the video sequences, two kinds of 3-D information are extracted: a three-dimensional surface measurement of the visible parts of the body for each triplet and 3-D trajectories of points on the body. The approach for surface measurement is based on multi-image matching, using the adaptive least squares method. A full automatic matching process determines a dense set of corresponding points in the triplets. The 3-D coordinates of the matched points are then computed by forward ray intersection using the orientation and calibration data of the cameras. The tracking process is also based on least squares matching techniques. Its basic idea is to track triplets of corresponding points in the three images through the sequence and compute their 3-D trajectories. The spatial correspondences between the three images at the same time and the temporal correspondences between subsequent frames are determined with a least squares matching algorithm. The results of the tracking process are the coordinates of a point in the three images through the sequence, thus the 3-D trajectory is determined by computing the 3-D coordinates of the point at each time step by forward ray intersection. Velocities and accelerations are also computed. The advantage of this tracking process is twofold: it can track natural points

  2. Repetitive transcranial magnetic stimulation of human MT+ reduces apparent motion perception.

    Science.gov (United States)

    Matsuyoshi, Daisuke; Hirose, Nobuyuki; Mima, Tatsuya; Fukuyama, Hidenao; Osaka, Naoyuki

    2007-12-18

    We investigated the effects of repetitive transcranial magnetic stimulation (rTMS) over the human cerebral cortex on apparent motion perception. Previous studies have shown that human extrastriate visual area MT+ (V5) processes not only real but also apparent motion. However, the functional relevance of MT+ on long-range apparent motion perception remains unclear. Here, we show direct evidence for the involvement of MT+ in apparent motion perception using rTMS, which is known to temporarily inhibit a localized region in the cerebral cortex. The results showed that apparent motion perception decreased after applying rTMS over MT+, but not after applying rTMS over the control region (inferior temporal gyrus). The decrease in performance caused by applying rTMS to MT+ suggests that MT+ is a causally responsible region for apparent motion perception, and thus, further supports the idea that MT+ plays a major role in the perception of motion.

  3. A Survey of Advances in Vision-Based Human Motion Capture and Analysis

    DEFF Research Database (Denmark)

    Moeslund, Thomas B.; Hilton, Adrian; Krüger, Volker

    2006-01-01

    This survey reviews advances in human motion capture and analysis from 2000 to 2006, following a previous survey of papers up to 2000 Human motion capture continues to be an increasingly active research area in computer vision with over 350 publications over this period. A number of significant r...... actions and behavior. This survey reviews recent trends in video based human capture and analysis, as well as discussing open problems for future research to achieve automatic visual analysis of human movement....

  4. Content-Based Human Motion Retrieval with Scene Description Language

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    As commercial motion capture systems are widely used, more and more 3D motion libraries become available, reinforcing the demand for efficient indexing and retrieving methods. Usually, the user will only have a sketchy idea of which kind of motion to look for in the motion database. As a result, how to clearly describe the user's demands is a bottleneck for motion retrieval system. This paper presented a framework that can handle this problem effectively for motion retrieval. This content-based retrieval system supports two kinds of query modes:textual query mode and query-by-example mode. In both query modes, user's input is translated into scene description language first, which can be processed by the system efficiently. By using various kinds of qualitative features and adaptive segments of motion capture data stream, indexing and retrieval methods are carried out at the segment level rather than at the frame level, making them quite efficient. Some experimental examples are given to demonstrate the effectiveness and efficiency of the proposed algorithms.

  5. A Three-Dimensional Spatiotemporal Template for Interactive Human Motion Analysis

    Directory of Open Access Journals (Sweden)

    Alexandra Branzan Albu

    2007-08-01

    Full Text Available This paper describes a new three-dimensional spatiotemporal template, namely the Volumetric Motion History Image (VMHI, for the purpose of human motion analysis. Irregularities in human actions typically occur either in speed or orientation; they carry information about the balance and the confidence level of the human subject performing the activity. The proposed VMHI template handles successfully shortcomings of existing spatiotemporal templates related to motion self -occlusion and speed. Therefore, VMHI allows for interactive visualization, as well as quantification of motion performance. This study focuses on the analysis of sway and speed-related abnormalities, which are among the most common motion irregularities in the studied set of human actions.

  6. Human confort response to random motions with a dominant rolling motion

    Science.gov (United States)

    Stone, R. W., Jr.

    1975-01-01

    Subjective ride comfort response ratings were measured on a visual motion simulator with rolling velocity inputs with various power spectra shapes and magnitudes. The results show only little influence of spectra shape on comfort response. The effects of magnitude on comfort response indicate the applicability of psychophysical precepts for comfort modeling.

  7. The 3D Human Motion Control Through Refined Video Gesture Annotation

    Science.gov (United States)

    Jin, Yohan; Suk, Myunghoon; Prabhakaran, B.

    In the beginning of computer and video game industry, simple game controllers consisting of buttons and joysticks were employed, but recently game consoles are replacing joystick buttons with novel interfaces such as the remote controllers with motion sensing technology on the Nintendo Wii [1] Especially video-based human computer interaction (HCI) technique has been applied to games, and the representative game is 'Eyetoy' on the Sony PlayStation 2. Video-based HCI technique has great benefit to release players from the intractable game controller. Moreover, in order to communicate between humans and computers, video-based HCI is very crucial since it is intuitive, easy to get, and inexpensive. On the one hand, extracting semantic low-level features from video human motion data is still a major challenge. The level of accuracy is really dependent on each subject's characteristic and environmental noises. Of late, people have been using 3D motion-capture data for visualizing real human motions in 3D space (e.g, 'Tiger Woods' in EA Sports, 'Angelina Jolie' in Bear-Wolf movie) and analyzing motions for specific performance (e.g, 'golf swing' and 'walking'). 3D motion-capture system ('VICON') generates a matrix for each motion clip. Here, a column is corresponding to a human's sub-body part and row represents time frames of data capture. Thus, we can extract sub-body part's motion only by selecting specific columns. Different from low-level feature values of video human motion, 3D human motion-capture data matrix are not pixel values, but is closer to human level of semantics.

  8. WearDY: Wearable dynamics. A prototype for human whole-body force and motion estimation

    Science.gov (United States)

    Latella, Claudia; Kuppuswamy, Naveen; Nori, Francesco

    2016-06-01

    Motion capture is a powerful tool used in a large range of applications towards human movement analysis. Although it is a well-established technique, its main limitation is the lack of dynamic information such as forces and torques during the motion capture. In this paper, we present a novel approach for human wearable dynamic (WearDY) motion capture for the simultaneous estimation of whole-body forces along with the motion. Our conceptual framework encompasses traditional passive markers based methods, inertial and contact force sensor modalities and harnesses a probabilistic computational framework for estimating dynamic quantities originally proposed in the domain of humanoid robot control. We present preliminary experimental analysis of our framework on subjects performing a two Degrees-of-Freedom bowing task and we estimate the motion and dynamic quantities. We discuss the implication of our proposal towards the design of a novel wearable force and motion capture suit and its applications.

  9. Teleoperation of a robot manipulator from 3D human hand-arm motion

    Science.gov (United States)

    Kofman, Jonathan; Verma, Siddharth; Wu, Xianghai; Luu, Timothy

    2003-10-01

    The control of a robot manipulator by a human operator is often necessary in unstructured dynamic environments with unfamiliar objects. Remote teleoperation is required when human presence at the robot site is undesirable or difficult, such as in handling hazardous materials and operating in dangerous or inaccessible environments. Previous approaches have employed mechanical or other contacting interfaces which require unnatural motions for object manipulation tasks or hinder dexterous human motion. This paper presents a non-contacting method of teleoperating a robot manipulator by having the human operator perform the 3D human hand-arm motion that would naturally be used to compete an object manipulation task and tracking the motion with a stereo-camera system at a local site. The 3D human hand-arm motion is reconstructed at the remote robot site and is used to control the position and orientation of the robot manipulator end-effector in real-time. Images captured of the robot interacting with objects at the remote site provide visual feedback to the human operator. Tests in teleoperation of the robot manipulator have demonstrated the ability of the human to carry out object manipulator tasks remotely and the teleoperated robot manipulator system to copy human-arm motions in real-time.

  10. Viewing the motion of human body parts activates different regions of premotor, temporal, and parietal cortex.

    Science.gov (United States)

    Wheaton, Kylie J; Thompson, James C; Syngeniotis, Ari; Abbott, David F; Puce, Aina

    2004-05-01

    Activation of premotor and temporoparietal cortex occurs when we observe others movements, particularly relating to objects. Viewing the motion of different body parts without the context of an object has not been systematically evaluated. During a 3T fMRI study, 12 healthy subjects viewed human face, hand, and leg motion, which was not directed at or did not involve an object. Activation was identified relative to static images of the same human face, hand, and leg in both individual subject and group average data. Four clear activation foci emerged: (1) right MT/V5 activated to all forms of viewed motion; (2) right STS activated to face and leg motion; (3) ventral premotor cortex activated to face, hand, and leg motion in the right hemisphere and to leg motion in the left hemisphere; and (4) anterior intraparietal cortex (aIP) was active bilaterally to viewing hand motion and in the right hemisphere leg motion. In addition, in the group data, a somatotopic activation pattern for viewing face, hand, and leg motion occurred in right ventral premotor cortex. Activation patterns in STS and aIP were more complex--typically activation foci to viewing two types of human motion showed some overlap. Activation in individual subjects was similar; however, activation to hand motion also occurred in the STS with a variable location across subjects--explaining the lack of a clear activation focus in the group data. The data indicate that there are selective responses to viewing motion of different body parts in the human brain that are independent of object or tool use.

  11. S3-3: Misbinding of Color and Motion in Human V2 Revealed by Color-Contingent Motion Adaptation

    Directory of Open Access Journals (Sweden)

    Fang Fang

    2012-10-01

    Full Text Available Wu, Kanai, & Shimojo (2004 Nature 429 262 described a compelling illusion demonstrating a steady-state misbinding of color and motion. Here, we took advantage of the illusion and performed psychophysical and fMRI adaptation experiments to explore the neural mechanism of color-motion misbinding. The stimulus subtended 20 deg by 14 deg of visual angle and contained two sheets of random dots, one sheet moving up and the other moving down. On the upward-moving sheet, dots in the right-end area (4 deg by 14 deg were red, and the rest of the dots were green. On the downward-moving sheet, dots in the right-end area were green, and the rest of the dots were red. When subjects fixated at the center of the stimulus, they bound the color and motion of the dots in the right-end area erroneously–the red dots appeared to move downwards and the green dots appeared to move upwards. In the psychophysical experiment, we measured the color-contingent motion aftereffect in the right-end area after adaptation to the illusory stimulus. A significant aftereffect was observed as if subjects had adapted to the perceived binding of color and motion, rather than the physical binding. For example, after adaptation, stationary red dots appeared to move upwards, and stationary green dots appeared to move downwards. In the fMRI experiment, we measured direction-selective motion adaptation effects in V1, V2, V3, V4, V3A/B, and V5. Relative to other cortical areas, V2 showed a much stronger adaptation effect to the perceived motion direction (rather than the physical direction for both the red and green dots. Significantly, the fMRI adaptation effect in V2 correlated with the color-contingent motion aftereffect across twelve subjects. This study provides the first human evidence that color and motion could be misbound at a very early stage of visual processing.

  12. Speed of human biological form and motion processing.

    Directory of Open Access Journals (Sweden)

    George Buzzell

    Full Text Available Recent work suggests that biological motion processing can begin within ~110 ms of stimulus onset, as indexed by the P1 component of the event-related potential (ERP. Here, we investigated whether modulation of the P1 component reflects configural processing alone, rather than the processing of both configuration and motion cues. A three-stimulus oddball task was employed to evaluate bottom-up processing of biological motion. Intact point-light walkers (PLWs or scrambled PLWs served as distractor stimuli, whereas point-light displays of tool motion served as standard and target stimuli. In a second experiment, the same design was used, but the dynamic stimuli were replaced with static point-light displays. The first experiment revealed that dynamic PLWs elicited a larger P1 as compared to scrambled PLWs. A similar P1 increase was also observed for static PLWs in the second experiment, indicating that these stimuli were more salient than static, scrambled PLWs. These findings suggest that the visual system can rapidly extract global form information from static PLWs and that the observed P1 effect for dynamic PLWs is not dependent on the presence of motion cues. Finally, we found that the N1 component was sensitive to dynamic, but not static, PLWs, suggesting that this component reflects the processing of both form and motion information. The sensitivity of P1 to static PLWs has implications for dynamic form models of biological motion processing that posit temporal integration of configural cues present in individual frames of PLW animations.

  13. A Study of an EMG-Based Exoskeletal Robot for Human Shoulder Motion Support

    Science.gov (United States)

    Kiguchi, Kazuo; Iwami, Koya; Watanabe, Keigo; Fukuda, Toshio

    We have been developing exoskeletal robots in order to realize the human motion support (especially for physically weak people). In this paper, we propose a 2-DOF exoskeletal robot and its method of control to support the human shoulder motion. In this exoskeletal robot, the flexion-extension and abduction-adduction motions of the shoulder are supported by activating the arm holder of the robot, which is atached to the upper arm of the human subject, using wires driven by DC motors. A fuzzy-neuro controller is designed to control the robot according to the skin surface electromyogram(EMG) signals in which the intention of the human subject is reflected. The proposed controller controls the flexion-extension and abduction-adduction motion of the human subject. The effectiveness of the proposed exoskeletal robot has been evaluated experimentally.

  14. Nonlinear Synchronization for Automatic Learning of 3D Pose Variability in Human Motion Sequences

    Directory of Open Access Journals (Sweden)

    Mozerov M

    2010-01-01

    Full Text Available A dense matching algorithm that solves the problem of synchronizing prerecorded human motion sequences, which show different speeds and accelerations, is proposed. The approach is based on minimization of MRF energy and solves the problem by using Dynamic Programming. Additionally, an optimal sequence is automatically selected from the input dataset to be a time-scale pattern for all other sequences. The paper utilizes an action specific model which automatically learns the variability of 3D human postures observed in a set of training sequences. The model is trained using the public CMU motion capture dataset for the walking action, and a mean walking performance is automatically learnt. Additionally, statistics about the observed variability of the postures and motion direction are also computed at each time step. The synchronized motion sequences are used to learn a model of human motion for action recognition and full-body tracking purposes.

  15. Low-cost human motion capture system for postural analysis onboard ships

    Science.gov (United States)

    Nocerino, Erica; Ackermann, Sebastiano; Del Pizzo, Silvio; Menna, Fabio; Troisi, Salvatore

    2011-07-01

    The study of human equilibrium, also known as postural stability, concerns different research sectors (medicine, kinesiology, biomechanics, robotics, sport) and is usually performed employing motion analysis techniques for recording human movements and posture. A wide range of techniques and methodologies has been developed, but the choice of instrumentations and sensors depends on the requirement of the specific application. Postural stability is a topic of great interest for the maritime community, since ship motions can make demanding and difficult the maintenance of the upright stance with hazardous consequences for the safety of people onboard. The need of capturing the motion of an individual standing on a ship during its daily service does not permit to employ optical systems commonly used for human motion analysis. These sensors are not designed for operating in disadvantageous environmental conditions (water, wetness, saltiness) and with not optimal lighting. The solution proposed in this study consists in a motion acquisition system that could be easily usable onboard ships. It makes use of two different methodologies: (I) motion capture with videogrammetry and (II) motion measurement with Inertial Measurement Unit (IMU). The developed image-based motion capture system, made up of three low-cost, light and compact video cameras, was validated against a commercial optical system and then used for testing the reliability of the inertial sensors. In this paper, the whole process of planning, designing, calibrating, and assessing the accuracy of the motion capture system is reported and discussed. Results from the laboratory tests and preliminary campaigns in the field are presented.

  16. A Combined Softening and Hardening Mechanism for Low Frequency Human Motion Energy Harvesting Application

    Directory of Open Access Journals (Sweden)

    Khalis Suhaimi

    2014-01-01

    Full Text Available This paper concerns the mechanism for harvesting energy from human body motion. The vibration signal from human body motion during walking and jogging was first measured using 3-axes vibration recorder placed at various places on the human body. The measured signal was then processed using Fourier series to investigate its frequency content. A mechanism was proposed to harvest the energy from the low frequency-low amplitude human motion. This mechanism consists of the combined nonlinear hardening and softening mechanism which was aimed at widening the bandwidth as well as amplifying the low human motion frequency. This was realized by using a translation-to-rotary mechanism which converts the translation motion of the human motion into the rotational motion. The nonlinearity in the system was realized by introducing a winding spring stiffness and the magnetic stiffness. Quasi-static and dynamic measurement were conducted to investigate the performance of the mechanism. The results show that, with the right degree of nonlinearity, the two modes can be combined together to produce a wide flat response. For the frequency amplification, the mechanism manages to increase the frequency by around 8 times in terms of rotational speed.

  17. Numerical Surrogates for Human Observers in Myocardial Motion Evaluation From SPECT Images.

    Science.gov (United States)

    Marin, Thibault; Kalayeh, Mahdi M; Parages, Felipe M; Brankov, Jovan G

    2014-01-01

    In medical imaging, the gold standard for image-quality assessment is a task-based approach in which one evaluates human observer performance for a given diagnostic task (e.g., detection of a myocardial perfusion or motion defect). To facilitate practical task-based image-quality assessment, model observers are needed as approximate surrogates for human observers. In cardiac-gated SPECT imaging, diagnosis relies on evaluation of the myocardial motion as well as perfusion. Model observers for the perfusion-defect detection task have been studied previously, but little effort has been devoted toward development of a model observer for cardiac-motion defect detection. In this work, we describe two model observers for predicting human observer performance in detection of cardiac-motion defects. Both proposed methods rely on motion features extracted using previously reported deformable mesh model for myocardium motion estimation. The first method is based on a Hotelling linear discriminant that is similar in concept to that used commonly for perfusion-defect detection. In the second method, based on relevance vector machines (RVM) for regression, we compute average human observer performance by first directly predicting individual human observer scores, and then using multi reader receiver operating characteristic analysis. Our results suggest that the proposed RVM model observer can predict human observer performance accurately, while the new Hotelling motion-defect detector is somewhat less effective.

  18. WiFi-Based Real-Time Calibration-Free Passive Human Motion Detection.

    Science.gov (United States)

    Gong, Liangyi; Yang, Wu; Man, Dapeng; Dong, Guozhong; Yu, Miao; Lv, Jiguang

    2015-12-21

    With the rapid development of WLAN technology, wireless device-free passive human detection becomes a newly-developing technique and holds more potential to worldwide and ubiquitous smart applications. Recently, indoor fine-grained device-free passive human motion detection based on the PHY layer information is rapidly developed. Previous wireless device-free passive human detection systems either rely on deploying specialized systems with dense transmitter-receiver links or elaborate off-line training process, which blocks rapid deployment and weakens system robustness. In the paper, we explore to research a novel fine-grained real-time calibration-free device-free passive human motion via physical layer information, which is independent of indoor scenarios and needs no prior-calibration and normal profile. We investigate sensitivities of amplitude and phase to human motion, and discover that phase feature is more sensitive to human motion, especially to slow human motion. Aiming at lightweight and robust device-free passive human motion detection, we develop two novel and practical schemes: short-term averaged variance ratio (SVR) and long-term averaged variance ratio (LVR). We realize system design with commercial WiFi devices and evaluate it in typical multipath-rich indoor scenarios. As demonstrated in the experiments, our approach can achieve a high detection rate and low false positive rate.

  19. Click-on-and-play human motion capture using wearable sensors

    NARCIS (Netherlands)

    Weenk, Dirk

    2015-01-01

    Human motion capture is often used in rehabilitation clinics for diagnostics and monitoring the effects of treatment. Traditionally, camera based systems are used. However, with these systems the measurements are restricted to a lab with expensive cameras. Motion capture outside a lab, using inertia

  20. Revisiting the importance of common body motion in human action perception.

    Science.gov (United States)

    Thurman, Steven M; Lu, Hongjing

    2016-01-01

    Human actions are complex dynamic stimuli comprised of two principle motion components: 1) common body motion, which represents the translation of the body when a person moves through space, and 2) relative limb movements, resulting from articulation of limbs after factoring out common body motion. Historically, most research in biological motion has focused primarily on relative limb movements while discounting the role of common body motion in human action perception. The current study examined the relative contribution of posture change resulting from relative limb movements and translation of body position resulting from common body motion in discriminating human walking versus running actions. We found that faster translation speeds of common body motion evoked significantly more responses consistent with running when discriminating ambiguous actions morphed between walking and running. Furthermore, this influence was systematically modulated by the uncertainty associated with intrinsic cues as determined by the degree of limited-lifetime spatial sampling. The contribution of common body motion increased monotonically as the reliability of inferring posture changes on the basis of intrinsic cues decreased. These results highlight the importance of translational body movements and their interaction with posture change as a result of relative limb movements in discriminating human actions when visual input information is sparse and noisy.

  1. Comparison of Flight Simulators Based on Human Motion Perception Metrics

    Science.gov (United States)

    Valente Pais, Ana R.; Correia Gracio, Bruno J.; Kelly, Lon C.; Houck, Jacob A.

    2015-01-01

    In flight simulation, motion filters are used to transform aircraft motion into simulator motion. When looking for the best match between visual and inertial amplitude in a simulator, researchers have found that there is a range of inertial amplitudes, rather than a single inertial value, that is perceived by subjects as optimal. This zone, hereafter referred to as the optimal zone, seems to correlate to the perceptual coherence zones measured in flight simulators. However, no studies were found in which these two zones were compared. This study investigates the relation between the optimal and the coherence zone measurements within and between different simulators. Results show that for the sway axis, the optimal zone lies within the lower part of the coherence zone. In addition, it was found that, whereas the width of the coherence zone depends on the visual amplitude and frequency, the width of the optimal zone remains constant.

  2. Mathematical Modeling and Evaluation of Human Motions in Physical Therapy Using Mixture Density Neural Networks

    Science.gov (United States)

    Vakanski, A; Ferguson, JM; Lee, S

    2016-01-01

    Objective The objective of the proposed research is to develop a methodology for modeling and evaluation of human motions, which will potentially benefit patients undertaking a physical rehabilitation therapy (e.g., following a stroke or due to other medical conditions). The ultimate aim is to allow patients to perform home-based rehabilitation exercises using a sensory system for capturing the motions, where an algorithm will retrieve the trajectories of a patient’s exercises, will perform data analysis by comparing the performed motions to a reference model of prescribed motions, and will send the analysis results to the patient’s physician with recommendations for improvement. Methods The modeling approach employs an artificial neural network, consisting of layers of recurrent neuron units and layers of neuron units for estimating a mixture density function over the spatio-temporal dependencies within the human motion sequences. Input data are sequences of motions related to a prescribed exercise by a physiotherapist to a patient, and recorded with a motion capture system. An autoencoder subnet is employed for reducing the dimensionality of captured sequences of human motions, complemented with a mixture density subnet for probabilistic modeling of the motion data using a mixture of Gaussian distributions. Results The proposed neural network architecture produced a model for sets of human motions represented with a mixture of Gaussian density functions. The mean log-likelihood of observed sequences was employed as a performance metric in evaluating the consistency of a subject’s performance relative to the reference dataset of motions. A publically available dataset of human motions captured with Microsoft Kinect was used for validation of the proposed method. Conclusion The article presents a novel approach for modeling and evaluation of human motions with a potential application in home-based physical therapy and rehabilitation. The described approach

  3. A human motion model based on maps for navigation systems

    Directory of Open Access Journals (Sweden)

    Kaiser Susanna

    2011-01-01

    Full Text Available Abstract Foot-mounted indoor positioning systems work remarkably well when using additionally the knowledge of floor-plans in the localization algorithm. Walls and other structures naturally restrict the motion of pedestrians. No pedestrian can walk through walls or jump from one floor to another when considering a building with different floor-levels. By incorporating known floor-plans in sequential Bayesian estimation processes such as particle filters (PFs, long-term error stability can be achieved as long as the map is sufficiently accurate and the environment sufficiently constraints pedestrians' motion. In this article, a new motion model based on maps and floor-plans is introduced that is capable of weighting the possible headings of the pedestrian as a function of the local environment. The motion model is derived from a diffusion algorithm that makes use of the principle of a source effusing gas and is used in the weighting step of a PF implementation. The diffusion algorithm is capable of including floor-plans as well as maps with areas of different degrees of accessibility. The motion model more effectively represents the probability density function of possible headings that are restricted by maps and floor-plans than a simple binary weighting of particles (i.e., eliminating those that crossed walls and keeping the rest. We will show that the motion model will help for obtaining better performance in critical navigation scenarios where two or more modes may be competing for some of the time (multi-modal scenarios.

  4. Segmentation and Classification of Human Actions and Actor Characteristics with 3d Motion Data

    Directory of Open Access Journals (Sweden)

    S. Ali Etemad

    2012-08-01

    Full Text Available In this paper we have used 3D motion capture data with the aim of detecting and classifying specifichuman actions. In addition to recognition of basic action classes, actor styles and characteristics such asgender, age, and energy level have also been subject to classification. We have applied and compared threemain methods: nearest neighbour search, hidden Markov models, and artificial neural networks. Usingthese techniques, we have proposed exhaustive algorithms for detection of actions in a motion piece andsubsequently classifying the segmented actions and respective characteristics of the actors. We have testedthe methods for various sequences and compared the results for a comprehensive evaluation of each of theproposed techniques. Our findings can be largely used for general classification of human motion data formultimedia applications as well as sorting and classifying data sets of human motion data especially thoseacquired using visual marker-based motion capture systems such as the one employed in this research.

  5. A triboelectric motion sensor in wearable body sensor network for human activity recognition.

    Science.gov (United States)

    Hui Huang; Xian Li; Ye Sun

    2016-08-01

    The goal of this study is to design a novel triboelectric motion sensor in wearable body sensor network for human activity recognition. Physical activity recognition is widely used in well-being management, medical diagnosis and rehabilitation. Other than traditional accelerometers, we design a novel wearable sensor system based on triboelectrification. The triboelectric motion sensor can be easily attached to human body and collect motion signals caused by physical activities. The experiments are conducted to collect five common activity data: sitting and standing, walking, climbing upstairs, downstairs, and running. The k-Nearest Neighbor (kNN) clustering algorithm is adopted to recognize these activities and validate the feasibility of this new approach. The results show that our system can perform physical activity recognition with a successful rate over 80% for walking, sitting and standing. The triboelectric structure can also be used as an energy harvester for motion harvesting due to its high output voltage in random low-frequency motion.

  6. Motion-defined surface segregation in human visual cortex.

    Science.gov (United States)

    Vigano, Gabriel J; Maloney, Ryan T; Clifford, Colin W G

    2014-11-01

    Surface segregation provides an efficient way to parse the visual scene for perceptual analysis. Here, we investigated the segregation of a bivectorial motion display into transparent surfaces through a psychophysical task and fMRI. We found that perceptual transparency correlated with neural activity in the early areas of the visual cortex, suggesting these areas may be involved in the segregation of motion-defined surfaces. Two oppositely rotating, uniquely colored random dot kinematograms (RDKs) were presented either sequentially or in a spatially interleaved manner, displayed at varying alternation frequencies. Participants reported the color and rotation direction pairing of the RDKs in the psychophysical task. The spatially interleaved display generated the percept of motion transparency across the range of frequencies tested, yielding ceiling task performance. At high alternation frequencies, performance on the sequential display also approached ceiling, indicative of perceived transparency. However, transparency broke down in lower alternation frequency sequential displays, producing performance close to chance. A corresponding pattern mirroring the psychophysical data was also evident in univariate and multivariate analyses of the fMRI BOLD activity in visual cortical areas V1, V2, V3, V3AB, hV4, and V5/MT+. Using gray RDKs, we found significant presentation by frequency interactions in most areas; differences in BOLD signal between presentation types were significant only at the lower alternation frequency. Multivariate pattern classification was similarly unable to discriminate between presentation types at the higher frequency. This study provides evidence that early visual cortex may code for motion-defined surface segregation, which in turn may enable perceptual transparency.

  7. Human Deception Detection from Whole Body Motion Analysis

    Science.gov (United States)

    2015-12-01

    development of assessment capabilities of these whole body movements for potential operational deployment. 2 Distribution A: Approved for...upon movement frequencies rather than spatial movement qualities. It was anticipated that, if predictive cues related to the spectral motion...replication analyses of the new samples based on the original findings from Year 1. The findings for the temporal/ spatial data from year 3 provided some

  8. Variable structure multiple model for articulated human motion tracking from monocular video sequences

    Institute of Scientific and Technical Information of China (English)

    HAN Hong; TONG MingLei; CHEN ZhiChao; FAN YouJian

    2012-01-01

    A new model-based human body tracking framework with learning-based theory is introduced inthis paper.We propose a variable structure multiple model (VSMM) framework to address challenging problems such as uncertainty of motion styles,imprecise detection of feature points,and ambiguity of joint locations.Key human joint points are detected automatically and the undetected points are estimated with Kalman filters.Multiple motion models are learned from motion capture data using a ridge regression method.The model set that covers the total motion set is designed on the basis of topological and compatibility relationships,while the VSMM algorithm is used to estimate quaternion vectors of joint rotation.Experiments using real image sequences and simulation videos demonstrate the high efficiency of our proposed human tracking framework.

  9. Design of a Wearable Sensing System for Human Motion Monitoring in Physical Rehabilitation

    Directory of Open Access Journals (Sweden)

    Stefano Cagnoni

    2013-06-01

    Full Text Available Human motion monitoring and analysis can be an essential part of a wide spectrum of applications, including physical rehabilitation among other potential areas of interest. Creating non-invasive systems for monitoring patients while performing rehabilitation exercises, to provide them with an objective feedback, is one of the current challenges. In this paper we present a wearable multi-sensor system for human motion monitoring, which has been developed for use in rehabilitation. It is composed of a number of small modules that embed high-precision accelerometers and wireless communications to transmit the information related to the body motion to an acquisition device. The results of a set of experiments we made to assess its performance in real-world setups demonstrate its usefulness in human motion acquisition and tracking, as required, for example, in activity recognition, physical/athletic performance evaluation and rehabilitation.

  10. Scavenging energy from the motion of human lower limbs via a piezoelectric energy harvester

    Science.gov (United States)

    Fan, Kangqi; Yu, Bo; Zhu, Yingmin; Liu, Zhaohui; Wang, Liansong

    2017-03-01

    Scavenging energy from human motion through piezoelectric transduction has been considered as a feasible alternative to batteries for powering portable devices and realizing self-sustained devices. To date, most piezoelectric energy harvesters (PEHs) developed can only collect energy from the uni-directional mechanical vibration. This deficiency severely limits their applicability to human motion energy harvesting because the human motion involves diverse mechanical motions. In this paper, a novel PEH is proposed to harvest energy from the motion of human lower limbs. This PEH is composed of two piezoelectric cantilever beams, a sleeve and a ferromagnetic ball. The two beams are designed to sense the vibration along the tibial axis and conduct piezoelectric conversion. The ball senses the leg swing and actuates the two beams to vibrate via magnetic coupling. Theoretical and experimental studies indicate that the proposed PEH can scavenge energy from both the vibration and the swing. During each stride, the PEH can produce multiple peaks in voltage output, which is attributed to the superposition of different excitations. Moreover, the root-mean-square (RMS) voltage output of the PEH increases when the walking speed ranges from 2 to 8 km/h. In addition, the ultra-low frequencies of human motion are also up-converted by the proposed design.

  11. Real-time estimation of 3D human arm motion from markerless images for human-machine interaction

    Science.gov (United States)

    Verma, Siddharth; Kofman, Jonathan

    2003-10-01

    Vision-based motion tracking is commonly used in surveillance, human-machine interfaces in robotics and automation, virtual and augmented reality applications and biomechanics. Most techniques require markers, use a predefined motion sequence or user-intervention for initialization, and do not process in real-time. This paper describes the implementation of a vision-based non-invasive technique for markerless real-time tracking of human-arm motion. Human-arm motion is tracked by processing images from two calibrated cameras in real-time to estimate the position of the 3D joint centers of the wrist and elbow, and determine the orientation of the hand from the 3D positions of the index finger and thumb. Tracking of the hand and arm was carried out without any prior knowledge of subject's arm length, texture, width and distance from the camera.

  12. Measuring Accurate Body Parameters of Dressed Humans with Large-Scale Motion Using a Kinect Sensor

    Directory of Open Access Journals (Sweden)

    Sidan Du

    2013-08-01

    Full Text Available Non-contact human body measurement plays an important role in surveillance, physical healthcare, on-line business and virtual fitting. Current methods for measuring the human body without physical contact usually cannot handle humans wearing clothes, which limits their applicability in public environments. In this paper, we propose an effective solution that can measure accurate parameters of the human body with large-scale motion from a Kinect sensor, assuming that the people are wearing clothes. Because motion can drive clothes attached to the human body loosely or tightly, we adopt a space-time analysis to mine the information across the posture variations. Using this information, we recover the human body, regardless of the effect of clothes, and measure the human body parameters accurately. Experimental results show that our system can perform more accurate parameter estimation on the human body than state-of-the-art methods.

  13. Representation of head-centric flow in the human motion complex.

    NARCIS (Netherlands)

    Goossens, J.; Dukelow, S.P.; Menon, R.S.; Vilis, T.; Berg, A.V. van den

    2006-01-01

    Recent neuroimaging studies have identified putative homologs of macaque middle temporal area (area MT) and medial superior temporal area (area MST) in humans. Little is known about the integration of visual and nonvisual signals in human motion areas compared with monkeys. Through extra-retinal sig

  14. Methodologies for the User Evaluation of the Motion of Virtual Humans

    NARCIS (Netherlands)

    Jansen, S.E.M.; Welbergen, van H.

    2009-01-01

    Virtual humans are employed in many interactive applications, including (serious) games. Their motion should be natural and allow interaction with its surroundings and other (virtual) humans in real time. Physical controllers offer physical realism and (physical) interaction with the environment. Be

  15. Methodologies for the user evaluation of the motion of virtual humans

    NARCIS (Netherlands)

    Jansen, S.E.M.; Welbergen, H. van

    2009-01-01

    Virtual humans are employed in many interactive applications, including (serious) games. Their motion should be natural and allow interaction with its surroundings and other (virtual) humans in real time. Physical controllers offer physical realism and (physical) interaction with the environment. Be

  16. Preference for Point-Light Human Biological Motion in Newborns: Contribution of Translational Displacement

    Science.gov (United States)

    Bidet-Ildei, Christel; Kitromilides, Elenitsa; Orliaguet, Jean-Pierre; Pavlova, Marina; Gentaz, Edouard

    2014-01-01

    In human newborns, spontaneous visual preference for biological motion is reported to occur at birth, but the factors underpinning this preference are still in debate. Using a standard visual preferential looking paradigm, 4 experiments were carried out in 3-day-old human newborns to assess the influence of translational displacement on perception…

  17. Rapid telomere motions in live human cells analyzed by highly time-resolved microscopy

    Directory of Open Access Journals (Sweden)

    Wang Xueying

    2008-10-01

    Full Text Available Abstract Background Telomeres cap chromosome ends and protect the genome. We studied individual telomeres in live human cancer cells. In capturing telomere motions using quantitative imaging to acquire complete high-resolution three-dimensional datasets every second for 200 seconds, telomere dynamics were systematically analyzed. Results The motility of individual telomeres within the same cancer cell nucleus was widely heterogeneous. One class of internal heterochromatic regions of chromosomes analyzed moved more uniformly and showed less motion and heterogeneity than telomeres. The single telomere analyses in cancer cells revealed that shorter telomeres showed more motion, and the more rapid telomere motions were energy dependent. Experimentally increasing bulk telomere length dampened telomere motion. In contrast, telomere uncapping, but not a DNA damaging agent, methyl methanesulfonate, significantly increased telomere motion. Conclusion New methods for seconds-scale, four-dimensional, live cell microscopic imaging and data analysis, allowing systematic tracking of individual telomeres in live cells, have defined a previously undescribed form of telomere behavior in human cells, in which the degree of telomere motion was dependent upon telomere length and functionality.

  18. Emergent Structural Mechanisms for High-Density Collective Motion Inspired by Human Crowds

    CERN Document Server

    Bottinelli, Arianna; Silverberg, Jesse L

    2016-01-01

    Collective motion of large human crowds often depends on their density. In extreme cases like heavy metal concerts and Black Friday sales events, motion is dominated by physical interactions instead of conventional social norms. Here, we study an active matter model inspired by situations when large groups of people gather at a point of common interest. Our analysis takes an approach developed for jammed granular media and identifies Goldstone modes, soft spots, and stochastic resonance as structurally-driven mechanisms for potentially dangerous emergent collective motion.

  19. Emergent Structural Mechanisms for High-Density Collective Motion Inspired by Human Crowds

    Science.gov (United States)

    Bottinelli, Arianna; Sumpter, David T. J.; Silverberg, Jesse L.

    2016-11-01

    Collective motion of large human crowds often depends on their density. In extreme cases like heavy metal concerts and black Friday sales events, motion is dominated by physical interactions instead of conventional social norms. Here, we study an active matter model inspired by situations when large groups of people gather at a point of common interest. Our analysis takes an approach developed for jammed granular media and identifies Goldstone modes, soft spots, and stochastic resonance as structurally driven mechanisms for potentially dangerous emergent collective motion.

  20. The development of human factors experimental evaluation technology - 3-dimensional measurement system for motion analysis

    Energy Technology Data Exchange (ETDEWEB)

    Park, Kyung Soo; Pan, Young Hwan; Lee, Ahn Jae; Lee, Kyung Tae; Lim, Chi Hwan; Chang, Pil Sik; Lee, Seok Woo; Han, Sung Wook; Park, Chul Wook [Korea Advanced Institute of Science and Technology, Taejon (Korea, Republic of)

    1996-07-01

    Measurement of human motion is important in the application of ergonomics. We developed a system which can measure body movement, especially= hand movement using advanced direct video measurement technology. This system has as dynamic accuracy with 1% error and the sampling rate to 6 - 10 Hz, and can analyse the trajectory and speed of the marker. The use of passive marker obviates the need for a marker telemetry system and minimize motion disruption. 18 refs., 4 tabs., 6 figs. (author)

  1. Human-motion energy harvester for autonomous body area sensors

    Science.gov (United States)

    Geisler, M.; Boisseau, S.; Perez, M.; Gasnier, P.; Willemin, J.; Ait-Ali, I.; Perraud, S.

    2017-03-01

    This paper reports on a method to optimize an electromagnetic energy harvester converting the low-frequency body motion and aimed at powering wireless body area sensors. This method is based on recorded accelerations, and mechanical and transduction models that enable an efficient joint optimization of the structural parameters. An optimized prototype of 14.8 mmØ × 52 mm, weighting 20 g, has generated up to 4.95 mW in a resistive load when worn at the arm during a run, and 6.57 mW when hand-shaken. Among the inertial electromagnetic energy harvesters reported so far, this one exhibits one of the highest power densities (up to 730 μW cm‑3). The energy harvester was finally used to power a bluetooth low energy wireless sensor node with accelerations measurements at 25 Hz.

  2. Spatiotemporal Filter for Visual Motion Integration from Pursuit Eye Movements in Humans and Monkeys.

    Science.gov (United States)

    Mukherjee, Trishna; Liu, Bing; Simoncini, Claudio; Osborne, Leslie C

    2017-02-08

    Despite the enduring interest in motion integration, a direct measure of the space-time filter that the brain imposes on a visual scene has been elusive. This is perhaps because of the challenge of estimating a 3D function from perceptual reports in psychophysical tasks. We take a different approach. We exploit the close connection between visual motion estimates and smooth pursuit eye movements to measure stimulus-response correlations across space and time, computing the linear space-time filter for global motion direction in humans and monkeys. Although derived from eye movements, we find that the filter predicts perceptual motion estimates quite well. To distinguish visual from motor contributions to the temporal duration of the pursuit motion filter, we recorded single-unit responses in the monkey middle temporal cortical area (MT). We find that pursuit response delays are consistent with the distribution of cortical neuron latencies and that temporal motion integration for pursuit is consistent with a short integration MT subpopulation. Remarkably, the visual system appears to preferentially weight motion signals across a narrow range of foveal eccentricities rather than uniformly over the whole visual field, with a transiently enhanced contribution from locations along the direction of motion. We find that the visual system is most sensitive to motion falling at approximately one-third the radius of the stimulus aperture. Hypothesizing that the visual drive for pursuit is related to the filtered motion energy in a motion stimulus, we compare measured and predicted eye acceleration across several other target forms.SIGNIFICANCE STATEMENT A compact model of the spatial and temporal processing underlying global motion perception has been elusive. We used visually driven smooth eye movements to find the 3D space-time function that best predicts both eye movements and perception of translating dot patterns. We found that the visual system does not appear to use

  3. Teaching Instrumentation and Methodology in Human Motion Analysis

    Science.gov (United States)

    2007-11-02

    measurement of kinematics of human movement, kinetic quantities experienced by the human body in contact with the ground, and myoelectric changes... signal processing issues that must be addressed in order to obtain and use quantitative measurement variables in the biomecanical context. Measurement...control of motorics, EMG signal processing to study muscle fatigue, EMG-force relationship, prostheses of extremities, and the like. The course

  4. Postures and Motions Library Development for Verification of Ground Crew Human Systems Integration Requirements

    Science.gov (United States)

    Jackson, Mariea Dunn; Dischinger, Charles; Stambolian, Damon; Henderson, Gena

    2012-01-01

    Spacecraft and launch vehicle ground processing activities require a variety of unique human activities. These activities are being documented in a Primitive motion capture library. The Library will be used by the human factors engineering in the future to infuse real to life human activities into the CAD models to verify ground systems human factors requirements. As the Primitive models are being developed for the library the project has selected several current human factors issues to be addressed for the SLS and Orion launch systems. This paper explains how the Motion Capture of unique ground systems activities are being used to verify the human factors analysis requirements for ground system used to process the STS and Orion vehicles, and how the primitive models will be applied to future spacecraft and launch vehicle processing.

  5. Postures and Motions Library Development for Verification of Ground Crew Human Factors Requirements

    Science.gov (United States)

    Stambolian, Damon; Henderson, Gena; Jackson, Mariea Dunn; Dischinger, Charles

    2013-01-01

    Spacecraft and launch vehicle ground processing activities require a variety of unique human activities. These activities are being documented in a primitive motion capture library. The library will be used by human factors engineering analysts to infuse real to life human activities into the CAD models to verify ground systems human factors requirements. As the primitive models are being developed for the library, the project has selected several current human factors issues to be addressed for the Space Launch System (SLS) and Orion launch systems. This paper explains how the motion capture of unique ground systems activities is being used to verify the human factors engineering requirements for ground systems used to process the SLS and Orion vehicles, and how the primitive models will be applied to future spacecraft and launch vehicle processing.

  6. Markerless human motion capture by Markov random field and dynamic graph cuts with color constraints

    Institute of Scientific and Technical Information of China (English)

    LI Jia; WAN ChengKai; ZHANG DianYong; MIAO ZhenJiang; YUAN BaoZong

    2009-01-01

    Currently, many vision-based motion capture systems require passive markers attached to key lca-tions on the human body. However, such systems are intrusive with limited application. The algorithm that we use for human motion capture in this paper is based on Markov random field (MRF) and dynamic graph cuts. It takes full account of the impact of 3D reconstruction error and integrates human motion capture and 3D reconstruction into MRF-MAP framework. For more accurate and robust performance, we extend our algorithm by incorporating color constraints Into the pose estimation process. The ad-vantages of incorporating color constraints are demonstrated by experimental results on several video sequences.

  7. The Use of the Matrix Method for the Study of Human Motion:Theory and Applications

    Institute of Scientific and Technical Information of China (English)

    Zong-Ming Li; Jesse A. Fisk; Savio L-Y. Woo

    2003-01-01

    Kinematics has been successfully used to describe body motion without reference to the kinetics (or forces causing the motion). In this article, both the theory and applications of the matrix method are provided to describe complex human motion. After the definition of a Cartesian coordinate frame is introduced, the description of transformations between multiple coordinate frames is given; the decomposition of a transformation matrix into anatomical joint motion parameters (e.g. Euler angles) is then explained. The advantages of the matrix method are illustrated by three examples related to biomechanical studies. The first describes a reaching and grasping task in which matrix transformations are applied to position the hand with respect to an object during grasping. The second example demonstrates the utility of the matrix method in revealing the coupling motion of the wrist between flexion-extension and radial-ulnar deviation. The last example highlights the indispensable use of the matrix method for the study of knee biomechanics, including the description of knee joint kinematics during functional activities and determination of in-situ ligament forces using robotic technology, which has advanced our understanding of the functions of the cruciate ligaments to knee joint kinematics. It is hoped that the theoretical development and biomechanical application examples will help the readers apply the matrix method to research problems related to human motion.

  8. Human Motion Recognition Using Ultra-Wideband Radar and Cameras on Mobile Robot

    Institute of Scientific and Technical Information of China (English)

    LI Tuanjie; GE Mengmeng

    2009-01-01

    Cameras can reliably detect human motions in a normal environment, but they are usually affected by sudden illumination changes and complex conditions, which are the major obstacles to the reliability and robustness of the system. To solve this problem, a novel integration method was proposed to combine bi-static uitra-wideband radar and cameras. In this recognition system, two cameras are used to localize the object's region, regions while a radar is used to obtain its 3D motion models on a mobile robot. The recognition results can be matched in the 3D motion library in order to recognize its motions. To confirm the effectiveness of the proposed method, the experi-mental results of recognition using vision sensors and those of recognition using the integration method were com-pared in different environments. Higher correct-recognition rate is achieved in the experiment.

  9. A wearable wireless ultrasonic sensor network for human arm motion tracking.

    Science.gov (United States)

    Qi, Yongbin; Soh, Cheong Boon; Gunawan, Erry; Low, Kay-Soon

    2014-01-01

    This paper introduces a novel method for arm flexion/extension angles measurement using wireless ultrasonic sensor network. The approach uses unscented Kalman filter and D-H kinematical chain model to retrieve the joint angles. This method was experimentally validated by calculating the 2-dimensional wrist displacements from one mobile, placed on the point of subject's wrist, and four anchors. The performance of the proposed ultrasonic motion analysis system was bench-marked by commercial camera motion capture system. The experimental results demonstrate that a favorable performance of the proposed system in the estimation of upper limb motion. The proposed system is wireless, easy to wear, to use and much cheaper than current camera system. Thus, it has the potential to become a new and useful tool for routine clinical assessment of human motion.

  10. Adaptive Human aware Navigation based on Motion Pattern Analysis

    DEFF Research Database (Denmark)

    Tranberg, Søren; Svenstrup, Mikael; Andersen, Hans Jørgen

    2009-01-01

    Respecting people’s social spaces is an important prerequisite for acceptable and natural robot navigation in human environments. In this paper, we describe an adaptive system for mobile robot navigation based on estimates of whether a person seeks to interact with the robot or not. The estimates...... in a real world setting. The results demonstrate that the system is able to learn to navigate based on past interaction experiences, and to adapt to different behaviors over time....

  11. Automatic Identification of Inertial Sensors on the Human Body Segments

    NARCIS (Netherlands)

    Weenk, D.; Beijnum, van B.J.F.; Veltink, P.H.

    2011-01-01

    In the last few years, inertial sensors (accelerometers and gyroscopes) in combination with magnetic sensors was proven to be a suitable ambulatory alternative to traditional human motion tracking systems based on optical position measurements. While accurate full 6 degrees of freedom information is

  12. Emotion recognition using Kinect motion capture data of human gaits

    Science.gov (United States)

    Li, Shun; Cui, Liqing; Zhu, Changye; Li, Baobin

    2016-01-01

    Automatic emotion recognition is of great value in many applications, however, to fully display the application value of emotion recognition, more portable, non-intrusive, inexpensive technologies need to be developed. Human gaits could reflect the walker’s emotional state, and could be an information source for emotion recognition. This paper proposed a novel method to recognize emotional state through human gaits by using Microsoft Kinect, a low-cost, portable, camera-based sensor. Fifty-nine participants’ gaits under neutral state, induced anger and induced happiness were recorded by two Kinect cameras, and the original data were processed through joint selection, coordinate system transformation, sliding window gauss filtering, differential operation, and data segmentation. Features of gait patterns were extracted from 3-dimentional coordinates of 14 main body joints by Fourier transformation and Principal Component Analysis (PCA). The classifiers NaiveBayes, RandomForests, LibSVM and SMO (Sequential Minimal Optimization) were trained and evaluated, and the accuracy of recognizing anger and happiness from neutral state achieved 80.5% and 75.4%. Although the results of distinguishing angry and happiness states were not ideal in current study, it showed the feasibility of automatically recognizing emotional states from gaits, with the characteristics meeting the application requirements. PMID:27672492

  13. Emotion recognition using Kinect motion capture data of human gaits.

    Science.gov (United States)

    Li, Shun; Cui, Liqing; Zhu, Changye; Li, Baobin; Zhao, Nan; Zhu, Tingshao

    2016-01-01

    Automatic emotion recognition is of great value in many applications, however, to fully display the application value of emotion recognition, more portable, non-intrusive, inexpensive technologies need to be developed. Human gaits could reflect the walker's emotional state, and could be an information source for emotion recognition. This paper proposed a novel method to recognize emotional state through human gaits by using Microsoft Kinect, a low-cost, portable, camera-based sensor. Fifty-nine participants' gaits under neutral state, induced anger and induced happiness were recorded by two Kinect cameras, and the original data were processed through joint selection, coordinate system transformation, sliding window gauss filtering, differential operation, and data segmentation. Features of gait patterns were extracted from 3-dimentional coordinates of 14 main body joints by Fourier transformation and Principal Component Analysis (PCA). The classifiers NaiveBayes, RandomForests, LibSVM and SMO (Sequential Minimal Optimization) were trained and evaluated, and the accuracy of recognizing anger and happiness from neutral state achieved 80.5% and 75.4%. Although the results of distinguishing angry and happiness states were not ideal in current study, it showed the feasibility of automatically recognizing emotional states from gaits, with the characteristics meeting the application requirements.

  14. Optimal Mapping of Torus Self-Organizing Map for Human Forearm Motions Discrimination on the Basis of Myoelectric Signals

    Science.gov (United States)

    Kiso, Atsushi; Seki, Hirokazu

    This paper describes an optimal mapping of the torus self-organizing map for a human forearm motion discrimination on the basis of the myoelectric signals. This study uses the torus self-organizing map (Torus-SOM) for the motion discrimination. The normal SOM identify input data into the same feature group by using the all units of map. Then there is a possibility of the misrecognition motion around the boundary lines of the motion groups. Therefore, this study proposes the mapping method of SOM that the learning units of the same motion concentrate on one local range and the learning unit groups of each motion separates enough. As a result, the variance in the same motion group becomes small and the variance between each motion groups becomes big. Some experiments on the myoelectric hand simulator show the effectiveness of the proposed motion discrimination method.

  15. The use of wearable inertial motion sensors in human lower limb biomechanics studies: a systematic review.

    Science.gov (United States)

    Fong, Daniel Tik-Pui; Chan, Yue-Yan

    2010-01-01

    Wearable motion sensors consisting of accelerometers, gyroscopes and magnetic sensors are readily available nowadays. The small size and low production costs of motion sensors make them a very good tool for human motions analysis. However, data processing and accuracy of the collected data are important issues for research purposes. In this paper, we aim to review the literature related to usage of inertial sensors in human lower limb biomechanics studies. A systematic search was done in the following search engines: ISI Web of Knowledge, Medline, SportDiscus and IEEE Xplore. Thirty nine full papers and conference abstracts with related topics were included in this review. The type of sensor involved, data collection methods, study design, validation methods and its applications were reviewed.

  16. The Use of Wearable Inertial Motion Sensors in Human Lower Limb Biomechanics Studies: A Systematic Review

    Directory of Open Access Journals (Sweden)

    Yue-Yan Chan

    2010-12-01

    Full Text Available Wearable motion sensors consisting of accelerometers, gyroscopes and magnetic sensors are readily available nowadays. The small size and low production costs of motion sensors make them a very good tool for human motions analysis. However, data processing and accuracy of the collected data are important issues for research purposes. In this paper, we aim to review the literature related to usage of inertial sensors in human lower limb biomechanics studies. A systematic search was done in the following search engines: ISI Web of Knowledge, Medline, SportDiscus and IEEE Xplore. Thirty nine full papers and conference abstracts with related topics were included in this review. The type of sensor involved, data collection methods, study design, validation methods and its applications were reviewed.

  17. Analysis of Human's Motions Based on Local Mean Decomposition in Through-wall Radar Detection

    Science.gov (United States)

    Lu, Qi; Liu, Cai; Zeng, Zhaofa; Li, Jing; Zhang, Xuebing

    2016-04-01

    Observation of human motions through a wall is an important issue in security applications and search-and rescue. Radar has advantages in looking through walls where other sensors give low performance or cannot be used at all. Ultrawideband (UWB) radar has high spatial resolution as a result of employment of ultranarrow pulses. It has abilities to distinguish the closely positioned targets and provide time-lapse information of targets. Moreover, the UWB radar shows good performance in wall penetration when the inherently short pulses spread their energy over a broad frequency range. Human's motions show periodic features including respiration, swing arms and legs, fluctuations of the torso. Detection of human targets is based on the fact that there is always periodic motion due to breathing or other body movements like walking. The radar can gain the reflections from each human body parts and add the reflections at each time sample. The periodic movements will cause micro-Doppler modulation in the reflected radar signals. Time-frequency analysis methods are consider as the effective tools to analysis and extract micro-Doppler effects caused by the periodic movements in the reflected radar signal, such as short-time Fourier transform (STFT), wavelet transform (WT), and Hilbert-Huang transform (HHT).The local mean decomposition (LMD), initially developed by Smith (2005), is to decomposed amplitude and frequency modulated signals into a small set of product functions (PFs), each of which is the product of an envelope signal and a frequency modulated signal from which a time-vary instantaneous phase and instantaneous frequency can be derived. As bypassing the Hilbert transform, the LMD has no demodulation error coming from window effect and involves no negative frequency without physical sense. Also, the instantaneous attributes obtained by LMD are more stable and precise than those obtained by the empirical mode decomposition (EMD) because LMD uses smoothed local

  18. Herniorrafia ambulatorial comparada à convencional Ambulatory versus conventional herniorraphy

    Directory of Open Access Journals (Sweden)

    Daniel Nunes e Silva

    2004-10-01

    Full Text Available OBJETIVO: O tratamento cirúrgico ambulatorial de hérnias inguinais é uma tendência em muitos serviços de saúde. No entanto, em nosso meio, tal procedimento ainda não perfaz uma rotina. Objetivamos analisar os benefícios e complicações da herniorrafia inguinal ambulatorial comparada à convencional. MÉTODO: Realizamos uma análise retrospectiva envolvendo, inicialmente, 105 pacientes submetidos a herniorrafia inguinal ambulatorial (HIA e internação convencional (IC de fevereiro a outubro de 2002 no Complexo Hospitalar Santa Casa de Porto Alegre (CHSCPA. Foram avaliados os benefícios e complicações no 15º, 90º e 180º dias de pós-operatório. Além disso, foi realizada avaliação dos custos hospitalares. Os métodos de análise incluíram o teste t de Fischer e X² . Foram considerados estatisticamente significativos resultados com pBACKGROUND: Ambulatory inguinal herniorraphy is performed worldwide. However, this procedure is not performed routinely in our reality. Our objetive is to analyze the benefits and complications of ambulatory inguinal herniorraphy in comparison to conventional intervention in our Service. METHODS: A retrospective analysis was performed with 105 patients who uwderwent ambulatorial or conventional inguinal herniorraphy between February and October of 2002. Variables, including costs, were analyzed at the 15th, 90th and 180th postoperative days. The Fischer's t test and chi-square test were used. Statistical significance was considered for a p value of p<0.05. RESULTS: From 105 patients, seven were excluded. The total rate complication was 36.08%. There was no significative statistical difference between groups at any time. The most common complication was local pain (24.7%. The costs decreased 20% when surgery was performed in an ambulatory basis as well as the waiting time which was also reduced. CONCLUSION: The ambulatory herniorraphy is a safe procedure, decreases hospital stay, costs and it has a

  19. Complex Human Activity Recognition Using Smartphone and Wrist-Worn Motion Sensors

    NARCIS (Netherlands)

    Shoaib, Muhammad; Bosch, Stephan; Durmaz Incel, Ozlem; Scholten, Hans; Havinga, Paul J.M.

    2016-01-01

    The position of on-body motion sensors plays an important role in human activity recognition. Most often, mobile phone sensors at the trouser pocket or an equivalent position are used for this purpose. However, this position is not suitable for recognizing activities that involve hand gestures, such

  20. Population activity in the human dorsal pathway predicts the accuracy of visual motion detection

    NARCIS (Netherlands)

    Donner, T.H.; Siegel, M.; Oostenveld, R.; Fries, P.; Bauer, M.; Engel, A.K.

    2007-01-01

    A person's ability to detect a weak visual target stimulus varies from one viewing to the next. We tested whether the trial-to-trial fluctuations of neural population activity in the human brain are related to the fluctuations of behavioral performance in a "yes-no" visual motion-detection task. We

  1. Biomedical Wireless Ambulatory Crew Monitor

    Science.gov (United States)

    Chmiel, Alan; Humphreys, Brad

    2009-01-01

    A compact, ambulatory biometric data acquisition system has been developed for space and commercial terrestrial use. BioWATCH (Bio medical Wireless and Ambulatory Telemetry for Crew Health) acquires signals from biomedical sensors using acquisition modules attached to a common data and power bus. Several slots allow the user to configure the unit by inserting sensor-specific modules. The data are then sent real-time from the unit over any commercially implemented wireless network including 802.11b/g, WCDMA, 3G. This system has a distributed computing hierarchy and has a common data controller on each sensor module. This allows for the modularity of the device along with the tailored ability to control the cards using a relatively small master processor. The distributed nature of this system affords the modularity, size, and power consumption that betters the current state of the art in medical ambulatory data acquisition. A new company was created to market this technology.

  2. Ambulatory Estimation of Relative Foot Positions using Ultrasound

    NARCIS (Netherlands)

    Weenk, Dirk; Coelen, van der Michiel; Geessink, Arno A.G.; Hoek, van der Frank J.; Verstoep, Bart; Kortier, Henk G.; Meulen, van Fokke B.; Beijnum, van Bert-Jan F.; Veltink, Peter H.

    2013-01-01

    The recording of human movement is used for biomedical applications like physical therapy and sports training. Over the last few years inertial sensors have been proven to be a useful ambulatory alternative to traditional optical systems. An example of a successful application is the instrumented sh

  3. An examination of the degrees of freedom of human jaw motion in speech and mastication.

    Science.gov (United States)

    Ostry, D J; Vatikiotis-Bateson, E; Gribble, P L

    1997-12-01

    The kinematics of human jaw movements were assessed in terms of the three orientation angles and three positions that characterize the motion of the jaw as a rigid body. The analysis focused on the identification of the jaw's independent movement dimensions, and was based on an examination of jaw motion paths that were plotted in various combinations of linear and angular coordinate frames. Overall, both behaviors were characterized by independent motion in four degrees of freedom. In general, when jaw movements were plotted to show orientation in the sagittal plane as a function of horizontal position, relatively straight paths were observed. In speech, the slopes and intercepts of these paths varied depending on the phonetic material. The vertical position of the jaw was observed to shift up or down so as to displace the overall form of the sagittal plane motion path of the jaw. Yaw movements were small but independent of pitch, and vertical and horizontal position. In mastication, the slope and intercept of the relationship between pitch and horizontal position were affected by the type of food and its size. However, the range of variation was less than that observed in speech. When vertical jaw position was plotted as a function of horizontal position, the basic form of the path of the jaw was maintained but could be shifted vertically. In general, larger bolus diameters were associated with lower jaw positions throughout the movement. The timing of pitch and yaw motion differed. The most common pattern involved changes in pitch angle during jaw opening followed by a phase predominated by lateral motion (yaw). Thus, in both behaviors there was evidence of independent motion in pitch, yaw, horizontal position, and vertical position. This is consistent with the idea that motions in these degrees of freedom are independently controlled.

  4. Motion and flexibility in human cytochrome p450 aromatase.

    Directory of Open Access Journals (Sweden)

    Wenhua Jiang

    Full Text Available The crystal structures of human placental aromatase in complex with the substrate androstenedione and exemestane have revealed an androgen-specific active site and the structural basis for higher order organization. However, X-ray structures do not provide accounts of movements due to short-range fluctuations, ligand binding and protein-protein association. In this work, we conduct normal mode analysis (NMA revealing the intrinsic fluctuations of aromatase, deduce the internal modes in membrane-free and membrane-integrated monomers as well as the intermolecular modes in oligomers, and propose a quaternary organization for the endoplasmic reticulum (ER membrane integration. Dynamics of the crystallographic oligomers from NMA is found to be in agreement with the isotropic thermal factors from the X-ray analysis. Calculations of the root mean square fluctuations of the C-alpha atoms from their equilibrium positions confirm that the rigid-core structure of aromatase is intrinsic regardless of the changes in steroid binding interactions, and that aromatase self-association does not deteriorate the rigidity of the catalytic cleft. Furthermore, NMA on membrane-integrated aromatase shows that the internal modes in all likelihood contribute to breathing of the active site access channel. The collective intermolecular hinge bending and twisting modes provide the flexibility in the quaternary association necessary for membrane integration of the aromatase oligomers. Taken together, fluctuations of the active site, the access channel, and the heme-proximal cavity, and a dynamic quaternary organization could all be essential components of the functional aromatase in its role as an ER membrane-embedded steroidogenic enzyme.

  5. Spatio-Temporal Constrained Human Trajectory Generation from the PIR Motion Detector Sensor Network Data: A Geometric Algebra Approach

    Directory of Open Access Journals (Sweden)

    Zhaoyuan Yu

    2015-12-01

    Full Text Available Passive infrared (PIR motion detectors, which can support long-term continuous observation, are widely used for human motion analysis. Extracting all possible trajectories from the PIR sensor networks is important. Because the PIR sensor does not log location and individual information, none of the existing methods can generate all possible human motion trajectories that satisfy various spatio-temporal constraints from the sensor activation log data. In this paper, a geometric algebra (GA-based approach is developed to generate all possible human trajectories from the PIR sensor network data. Firstly, the representation of the geographical network, sensor activation response sequences and the human motion are represented as algebraic elements using GA. The human motion status of each sensor activation are labeled using the GA-based trajectory tracking. Then, a matrix multiplication approach is developed to dynamically generate the human trajectories according to the sensor activation log and the spatio-temporal constraints. The method is tested with the MERL motion database. Experiments show that our method can flexibly extract the major statistical pattern of the human motion. Compared with direct statistical analysis and tracklet graph method, our method can effectively extract all possible trajectories of the human motion, which makes it more accurate. Our method is also likely to provides a new way to filter other passive sensor log data in sensor networks.

  6. Spatio-Temporal Constrained Human Trajectory Generation from the PIR Motion Detector Sensor Network Data: A Geometric Algebra Approach.

    Science.gov (United States)

    Yu, Zhaoyuan; Yuan, Linwang; Luo, Wen; Feng, Linyao; Lv, Guonian

    2015-12-30

    Passive infrared (PIR) motion detectors, which can support long-term continuous observation, are widely used for human motion analysis. Extracting all possible trajectories from the PIR sensor networks is important. Because the PIR sensor does not log location and individual information, none of the existing methods can generate all possible human motion trajectories that satisfy various spatio-temporal constraints from the sensor activation log data. In this paper, a geometric algebra (GA)-based approach is developed to generate all possible human trajectories from the PIR sensor network data. Firstly, the representation of the geographical network, sensor activation response sequences and the human motion are represented as algebraic elements using GA. The human motion status of each sensor activation are labeled using the GA-based trajectory tracking. Then, a matrix multiplication approach is developed to dynamically generate the human trajectories according to the sensor activation log and the spatio-temporal constraints. The method is tested with the MERL motion database. Experiments show that our method can flexibly extract the major statistical pattern of the human motion. Compared with direct statistical analysis and tracklet graph method, our method can effectively extract all possible trajectories of the human motion, which makes it more accurate. Our method is also likely to provides a new way to filter other passive sensor log data in sensor networks.

  7. Application Of Three-Dimensional Videography To Human Motion Studies: Constraints, Assumptions, And Mathematics

    Science.gov (United States)

    Rab, George T.

    1988-02-01

    Three-dimensional human motion analysis has been used for complex kinematic description of abnormal gait in children with neuromuscular disease. Multiple skin markers estimate skeletal segment position, and a sorting and smoothing routine provides marker trajectories. The position and orientation of the moving skeleton in space are derived mathematically from the marker positions, and joint motions are calculated from the Eulerian transformation matrix between linked proximal and distal skeletal segments. Reproduceability has been excellent, and the technique has proven to be a useful adjunct to surgical planning.

  8. Human pelvis motions when walking and when riding a therapeutic horse.

    Science.gov (United States)

    Garner, Brian A; Rigby, B Rhett

    2015-02-01

    A prevailing rationale for equine assisted therapies is that the motion of a horse can provide sensory stimulus and movement patterns that mimic those of natural human activities such as walking. The purpose of this study was to quantitatively measure and compare human pelvis motions when walking to those when riding a horse. Six able-bodied children (inexperienced riders, 8-12years old) participated in over-ground trials of self-paced walking and leader-paced riding on four different horses. Five kinematic measures were extracted from three-dimensional pelvis motion data: anteroposterior, superoinferior, and mediolateral translations, list angle about the anteroposterior axis, and twist angle about the superoinferior axis. There was generally as much or more variability in motion range observed between riding on the different horses as between riding and walking. Pelvis trajectories exhibited many similar features between walking and riding, including distorted lemniscate patterns in the transverse and frontal planes. In the sagittal plane the pelvis trajectory during walking exhibited a somewhat circular pattern whereas during riding it exhibited a more diagonal pattern. This study shows that riding on a horse can generate movement patterns in the human pelvis that emulate many, but not all, characteristics of those during natural walking.

  9. Virtual Character Animations from Human Body Motion by Automatic Direct and Inverse Kinematics-based Mapping

    Directory of Open Access Journals (Sweden)

    Andrea Sanna

    2015-02-01

    Full Text Available Motion capture systems provide an efficient and interactive solution for extracting information related to a human skeleton, which is often exploited to animate virtual characters. When the character cannot be assimilated to an anthropometric shape, the task to map motion capture data onto the armature to be animated could be extremely challenging. This paper presents two methodologies for the automatic mapping of a human skeleton onto virtual character armatures. Kinematics chains of the human skeleton are analyzed in order to map joints, bones and end-effectors onto an arbitrary shaped armatures. Both forward and inverse kinematics are considered. A prototype implementation has been developed by using the Microsoft Kinect as body tracking device. Results show that the proposed solution can already be used to animate truly different characters ranging from a Pixar-like lamp to different kinds of animals.

  10. Energy Harvesting from Upper-Limb Pulling Motions for Miniaturized Human-Powered Generators

    Directory of Open Access Journals (Sweden)

    Jeongjin Yeo

    2015-07-01

    Full Text Available The human-powered self-generator provides the best solution for individuals who need an instantaneous power supply for travel, outdoor, and emergency use, since it is less dependent on weather conditions and occupies less space than other renewable power supplies. However, many commercial portable self-generators that employ hand-cranking are not used as much as expected in daily lives although they have enough output capacity due to their intensive workload. This study proposes a portable human-powered generator which is designed to obtain mechanical energy from an upper limb pulling motion for improved human motion economy as well as efficient human-mechanical power transfer. A coreless axial-flux permanent magnet machine (APMM and a flywheel magnet rotor were used in conjunction with a one-way clutched power transmission system in order to obtain effective power from the pulling motion. The developed prototype showed an average energy conversion efficiency of 30.98% and an average output power of 0.32 W with a maximum of 1.89 W. Its small form factor (50 mm × 32 mm × 43.5 mm, 0.05 kg and the substantial electricity produced verify the effectiveness of the proposed method in the utilization of human power. It is expected that the developed generator could provide a mobile power supply.

  11. Energy Harvesting from Upper-Limb Pulling Motions for Miniaturized Human-Powered Generators.

    Science.gov (United States)

    Yeo, Jeongjin; Ryu, Mun-ho; Yang, Yoonseok

    2015-07-03

    The human-powered self-generator provides the best solution for individuals who need an instantaneous power supply for travel, outdoor, and emergency use, since it is less dependent on weather conditions and occupies less space than other renewable power supplies. However, many commercial portable self-generators that employ hand-cranking are not used as much as expected in daily lives although they have enough output capacity due to their intensive workload. This study proposes a portable human-powered generator which is designed to obtain mechanical energy from an upper limb pulling motion for improved human motion economy as well as efficient human-mechanical power transfer. A coreless axial-flux permanent magnet machine (APMM) and a flywheel magnet rotor were used in conjunction with a one-way clutched power transmission system in order to obtain effective power from the pulling motion. The developed prototype showed an average energy conversion efficiency of 30.98% and an average output power of 0.32 W with a maximum of 1.89 W. Its small form factor (50 mm × 32 mm × 43.5 mm, 0.05 kg) and the substantial electricity produced verify the effectiveness of the proposed method in the utilization of human power. It is expected that the developed generator could provide a mobile power supply.

  12. Validating hyperbilirubinemia and gut mucosal atrophy with a novel ultramobile ambulatory total parenteral nutrition piglet model

    Science.gov (United States)

    Total parenteral nutrition (TPN) provides all nutrition intravenously. Although TPN therapy has grown enormously, it causes significant complications, including gut and hepatic dysfunction. Current models use animal tethering which is unlike ambulatory human TPN delivery and is cost prohibitive. We ...

  13. Observation and analysis of high-speed human motion with frequent occlusion in a large area

    Science.gov (United States)

    Wang, Yuru; Liu, Jiafeng; Liu, Guojun; Tang, Xianglong; Liu, Peng

    2009-12-01

    The use of computer vision technology in collecting and analyzing statistics during sports matches or training sessions is expected to provide valuable information for tactics improvement. However, the measurements published in the literature so far are either unreliably documented to be used in training planning due to their limitations or unsuitable for studying high-speed motion in large area with frequent occlusions. A sports annotation system is introduced in this paper for tracking high-speed non-rigid human motion over a large playing area with the aid of motion camera, taking short track speed skating competitions as an example. The proposed system is composed of two sub-systems: precise camera motion compensation and accurate motion acquisition. In the video registration step, a distinctive invariant point feature detector (probability density grads detector) and a global parallax based matching points filter are used, to provide reliable and robust matching across a large range of affine distortion and illumination change. In the motion acquisition step, a two regions' relationship constrained joint color model and Markov chain Monte Carlo based joint particle filter are emphasized, by dividing the human body into two relative key regions. Several field tests are performed to assess measurement errors, including comparison to popular algorithms. With the help of the system presented, the system obtains position data on a 30 m × 60 m large rink with root-mean-square error better than 0.3975 m, velocity and acceleration data with absolute error better than 1.2579 m s-1 and 0.1494 m s-2, respectively.

  14. Folded Elastic Strip-Based Triboelectric Nanogenerator for Harvesting Human Motion Energy for Multiple Applications.

    Science.gov (United States)

    Kang, Yue; Wang, Bo; Dai, Shuge; Liu, Guanlin; Pu, Yanping; Hu, Chenguo

    2015-09-16

    A folded elastic strip-based triboelectric nanogenerator (FS-TENG) made from two folded double-layer elastic strips of Al/PET and PTFE/PET can achieve multiple functions by low frequency mechanical motion. A single FS-TENG with strip width of 3 cm and length of 27 cm can generate a maximum output current, open-circuit voltage, and peak power of 55 μA, 840 V, and 7.33 mW at deformation frequency of 4 Hz with amplitude of 2.5 cm, respectively. This FS-TENG can work as a weight sensor due to its good elasticity. An integrated generator assembled by four FS-TENGs (IFS-TENG) can harvest the energy of human motion like flapping hands and walking steps. In addition, the IFS-TENG combined with electromagnetically induced electricity can achieve a completely self-driven doorbell with flashing lights. Moreover, a box-like generator integrated by four IFS-TENGs inside can work in horizontal or random motion modes and can be improved to harvest energy in all directions. This work promotes the research of completely self-driven systems and energy harvesting of human motion for applications in our daily life.

  15. Multi-level model for 2D human motion analysis and description

    Science.gov (United States)

    Foures, Thomas; Joly, Philippe

    2003-01-01

    This paper deals with the proposition of a model for human motion analysis in a video. Its main caracteristic is to adapt itself automatically to the current resolution, the actual quality of the picture, or the level of precision required by a given application, due to its possible decomposition into several hierarchical levels. The model is region-based to address some analysis processing needs. The top level of the model is only defined with 5 ribbons, which can be cut into sub-ribbons regarding to a given (or an expected) level of details. Matching process between model and current picture consists in the comparison of extracted subject shape with a graphical rendering of the model built on the base of some computed parameters. The comparison is processed by using a chamfer matching algorithm. In our developments, we intend to realize a platform of interaction between a dancer and tools synthetizing abstract motion pictures and music in the conditions of a real-time dialogue between a human and a computer. In consequence, we use this model in a perspective of motion description instead of motion recognition: no a priori gestures are supposed to be recognized as far as no a priori application is specially targeted. The resulting description will be made following a Description Scheme compliant with the movement notation called "Labanotation".

  16. Biomechanical energy harvesting from human motion: theory, state of the art, design guidelines, and future directions

    Directory of Open Access Journals (Sweden)

    Shapiro Amir

    2011-04-01

    Full Text Available Abstract Background Biomechanical energy harvesting from human motion presents a promising clean alternative to electrical power supplied by batteries for portable electronic devices and for computerized and motorized prosthetics. We present the theory of energy harvesting from the human body and describe the amount of energy that can be harvested from body heat and from motions of various parts of the body during walking, such as heel strike; ankle, knee, hip, shoulder, and elbow joint motion; and center of mass vertical motion. Methods We evaluated major motions performed during walking and identified the amount of work the body expends and the portion of recoverable energy. During walking, there are phases of the motion at the joints where muscles act as brakes and energy is lost to the surroundings. During those phases of motion, the required braking force or torque can be replaced by an electrical generator, allowing energy to be harvested at the cost of only minimal additional effort. The amount of energy that can be harvested was estimated experimentally and from literature data. Recommendations for future directions are made on the basis of our results in combination with a review of state-of-the-art biomechanical energy harvesting devices and energy conversion methods. Results For a device that uses center of mass motion, the maximum amount of energy that can be harvested is approximately 1 W per kilogram of device weight. For a person weighing 80 kg and walking at approximately 4 km/h, the power generation from the heel strike is approximately 2 W. For a joint-mounted device based on generative braking, the joints generating the most power are the knees (34 W and the ankles (20 W. Conclusions Our theoretical calculations align well with current device performance data. Our results suggest that the most energy can be harvested from the lower limb joints, but to do so efficiently, an innovative and light-weight mechanical design is

  17. Highly stretchable and wearable graphene strain sensors with controllable sensitivity for human motion monitoring.

    Science.gov (United States)

    Park, Jung Jin; Hyun, Woo Jin; Mun, Sung Cik; Park, Yong Tae; Park, O Ok

    2015-03-25

    Because of their outstanding electrical and mechanical properties, graphene strain sensors have attracted extensive attention for electronic applications in virtual reality, robotics, medical diagnostics, and healthcare. Although several strain sensors based on graphene have been reported, the stretchability and sensitivity of these sensors remain limited, and also there is a pressing need to develop a practical fabrication process. This paper reports the fabrication and characterization of new types of graphene strain sensors based on stretchable yarns. Highly stretchable, sensitive, and wearable sensors are realized by a layer-by-layer assembly method that is simple, low-cost, scalable, and solution-processable. Because of the yarn structures, these sensors exhibit high stretchability (up to 150%) and versatility, and can detect both large- and small-scale human motions. For this study, wearable electronics are fabricated with implanted sensors that can monitor diverse human motions, including joint movement, phonation, swallowing, and breathing.

  18. Model-Based Reinforcement of Kinect Depth Data for Human Motion Capture Applications

    Directory of Open Access Journals (Sweden)

    Andreas Skiadopoulos

    2013-07-01

    Full Text Available Motion capture systems have recently experienced a strong evolution. New cheap depth sensors and open source frameworks, such as OpenNI, allow for perceiving human motion on-line without using invasive systems. However, these proposals do not evaluate the validity of the obtained poses. This paper addresses this issue using a model-based pose generator to complement the OpenNI human tracker. The proposed system enforces kinematics constraints, eliminates odd poses and filters sensor noise, while learning the real dimensions of the performer’s body. The system is composed by a PrimeSense sensor, an OpenNI tracker and a kinematics-based filter and has been extensively tested. Experiments show that the proposed system improves pure OpenNI results at a very low computational cost.

  19. Using Fuzzy Gaussian Inference and Genetic Programming to Classify 3D Human Motions

    Science.gov (United States)

    Khoury, Mehdi; Liu, Honghai

    This research introduces and builds on the concept of Fuzzy Gaussian Inference (FGI) (Khoury and Liu in Proceedings of UKCI, 2008 and IEEE Workshop on Robotic Intelligence in Informationally Structured Space (RiiSS 2009), 2009) as a novel way to build Fuzzy Membership Functions that map to hidden Probability Distributions underlying human motions. This method is now combined with a Genetic Programming Fuzzy rule-based system in order to classify boxing moves from natural human Motion Capture data. In this experiment, FGI alone is able to recognise seven different boxing stances simultaneously with an accuracy superior to a GMM-based classifier. Results seem to indicate that adding an evolutionary Fuzzy Inference Engine on top of FGI improves the accuracy of the classifier in a consistent way.

  20. Inertial Motion Tracking for Inserting Humans into a Networked Synthetic Environment

    Science.gov (United States)

    2007-08-31

    a Quaternion-Based Kalman Filter for Human Body Motion Tracking,” IEEE Transactions on Robotics , Vol. 22, Issue 6, December 2006. E. R. Bachmann and...Transactions On Neural Systems And Rehabilitation Engineering, Vol. 13, No. 3, September 2005. 1216 IEEE TRANSACTIONS ON ROBOTICS , VOL. 22, NO. 6...system. The use of an EKF pre- dictor resulted in errors 5–10 times lower than without predic- 1218 IEEE TRANSACTIONS ON ROBOTICS , VOL. 22, NO. 6

  1. A self-growing Bayesian network classifier for online learning of human motion patterns

    OpenAIRE

    Yung, NHC; Chen, Z

    2010-01-01

    This paper proposes a new self-growing Bayesian network classifier for online learning of human motion patterns (HMPs) in dynamically changing environments. The proposed classifier is designed to represent HMP classes based on a set of historical trajectories labeled by unsupervised clustering. It then assigns HMP class labels to current trajectories. Parameters of the proposed classifier are recalculated based on the augmented dataset of labeled trajectories and all HMP classes are according...

  2. Human Arm Motion Tracking by Orientation-Based Fusion of Inertial Sensors and Kinect Using Unscented Kalman Filter.

    Science.gov (United States)

    Atrsaei, Arash; Salarieh, Hassan; Alasty, Aria

    2016-09-01

    Due to various applications of human motion capture techniques, developing low-cost methods that would be applicable in nonlaboratory environments is under consideration. MEMS inertial sensors and Kinect are two low-cost devices that can be utilized in home-based motion capture systems, e.g., home-based rehabilitation. In this work, an unscented Kalman filter approach was developed based on the complementary properties of Kinect and the inertial sensors to fuse the orientation data of these two devices for human arm motion tracking during both stationary shoulder joint position and human body movement. A new measurement model of the fusion algorithm was obtained that can compensate for the inertial sensors drift problem in high dynamic motions and also joints occlusion in Kinect. The efficiency of the proposed algorithm was evaluated by an optical motion tracker system. The errors were reduced by almost 50% compared to cases when either inertial sensor or Kinect measurements were utilized.

  3. Contribution to a marker-free system for human motion analysis

    Science.gov (United States)

    Calais, Elodie F.; Legrand, Louis; Voisin, Yvon; Diou, Alan

    2002-07-01

    This paper presents a novel approach to human gait analysis using a marker-free system. The devised acquisition system is composed of three synchronized and calibrated charge coupled device cameras. The aim of this work is to recognize in gray level image sequences the leg of a walking human and to reconstruct it in the three-dimensional space. An articulated three- dimensional (3D) model of the human body, based on the use of tapered superquadric curves, is first introduced. A motion-based segmentation, using morphological operators, is then applied to the image sequences in order to extract the boundaries of the leg in motion. A reconstruction process, based on the use of a least median of squares regression is next performed, to determine the location of the human body in the 3D space. Finally, a spatial coherence is imposed on the reconstructed curves in order to better fit the anatomy of the leg and to take into account the articulated model. Each stage of the proposed methodology has been tested both on synthetic images and on real world images of walking humans. The obtained results suggest that this approach is quite promising and should be useful in the study of the gait.

  4. Some issues of the human arm motion obtained from its kinematic model

    Science.gov (United States)

    Lenarčič, Jadran

    1998-07-01

    A possible direction in the development of future robot manipulators is in the so-called humanoid robot systems. The objective is to develop robots that behave, work, and communicate like humans. This will open a new era in robot applications, in particular in service robotics, will facilitate robot programming, and create a more effective human-robot interface. This paper presents some potential motion properties of a future humanoid robot manipulator retrieved from kinematical models of the human arm, such as the kinematic redundancy, the workspace properties, and the velocity-torque capabilities. Special attention is given to the utilisation of the kinematic singularities in handling heavy objects. Based on experiments, it is unequivocally demonstrated that the human arm takes advantage of the kinematic singularities in order to compensate weak actuation, while in the actual robotic practice the kinematic singularities are avoided.

  5. The dart-throwing motion of the wrist: is it unique to humans?

    Science.gov (United States)

    Wolfe, Scott W; Crisco, Joseph J; Orr, Caley M; Marzke, Mary W

    2006-11-01

    Kinematic analysis has shown a near-stationary proximal carpal row during the dart-thrower's motion, which is believed to provide a stable platform for the generation of force and accuracy during certain power and precision grip activities. This finding is consistent with evidence in the human hand of adaptations that enabled effective manipulation of stones, cylindric wood, and bone tools for throwing and clubbing. There are at least two possible explanations for the observed human proximal carpal row kinematics. One is that it is retained from a previous common ancestor with great apes and previously adapted to some form of foraging or locomotor behavior involving the hands, but was recruited for tool use after we diverged from the apes. The second is that it evolved after our divergence from apes, in synchrony with adaptations in the human hand to the manipulation of tools, and central to the development of the human's unique ability to aim and accelerate tools and weapons.

  6. Communication in acute ambulatory care.

    Science.gov (United States)

    Dean, Marleah; Oetzel, John; Sklar, David P

    2014-12-01

    Effective communication has been linked to better health outcomes, higher patient satisfaction, and treatment adherence. Communication in ambulatory care contexts is even more crucial, as providers typically do not know patients' medical histories or have established relationships, conversations are time constrained, interruptions are frequent, and the seriousness of patients' medical conditions may create additional tension during interactions. Yet, health communication often unduly emphasizes information exchange-the transmission and receipt of messages leading to a mutual understanding of a patient's condition, needs, and treatments. This approach does not take into account the importance of rapport building and contextual issues, and may ultimately limit the amount of information exchanged.The authors share the perspective of communication scientists to enrich the current approach to medical communication in ambulatory health care contexts, broadening the under standing of medical communication beyond information exchange to a more holistic, multilayered viewpoint, which includes rapport and contextual issues. The authors propose a socio-ecological model for understanding communication in acute ambulatory care. This model recognizes the relationship of individuals to their environment and emphasizes the importance of individual and contextual factors that influence patient-provider interactions. Its key elements include message exchange and individual, organizational, societal, and cultural factors. Using this model, and following the authors' recommendations, providers and medical educators can treat communication as a holistic process shaped by multiple layers. This is a step toward being able to negotiate conflicting demands, resolve tensions, and create encounters that lead to positive health outcomes.

  7. Depiction of the neuroscientific principles of human motion 2 millennia ago by Lucretius.

    Science.gov (United States)

    Hyam, Jonathan A; Paterson, David J; Aziz, Tipu Z; Green, Alexander L

    2011-09-06

    Titus Lucretius Carus was an ancient Roman philosopher of the Epicurean school whose epic poem On the Nature of Things described numerous aspects of the natural world. In fact, much contemporary scientific understanding is consistent with or inspired by his work. Among Lucretius's contributions to neurology were his descriptions of epileptic seizures, sleep, and his theory of vision. This report identifies how Lucretius's description of human motion recognized the fundamental principles understood by contemporary neurologists and neuroscientists, namely the importance of the mind and intelligence in determining whether to move, in the initiation of motion and its effect on the rest of the body; the importance of mental imagery and perception of the motor task's nature and workload in addition to the necessary systemic changes occurring in parallel with the muscle activity. Lucretius was the first commentator to introduce into Epicurean poetry the concept of such a mechanism consisting of a logical order of processes which are still consistent with modern concepts.

  8. A novel supervised trajectory segmentation algorithm identifies distinct types of human adenovirus motion in host cells.

    Science.gov (United States)

    Helmuth, Jo A; Burckhardt, Christoph J; Koumoutsakos, Petros; Greber, Urs F; Sbalzarini, Ivo F

    2007-09-01

    Biological trajectories can be characterized by transient patterns that may provide insight into the interactions of the moving object with its immediate environment. The accurate and automated identification of trajectory motifs is important for the understanding of the underlying mechanisms. In this work, we develop a novel trajectory segmentation algorithm based on supervised support vector classification. The algorithm is validated on synthetic data and applied to the identification of trajectory fingerprints of fluorescently tagged human adenovirus particles in live cells. In virus trajectories on the cell surface, periods of confined motion, slow drift, and fast drift are efficiently detected. Additionally, directed motion is found for viruses in the cytoplasm. The algorithm enables the linking of microscopic observations to molecular phenomena that are critical in many biological processes, including infectious pathogen entry and signal transduction.

  9. Human motion tracking by temporal-spatial local gaussian process experts.

    Science.gov (United States)

    Zhao, Xu; Fu, Yun; Liu, Yuncai

    2011-04-01

    Human pose estimation via motion tracking systems can be considered as a regression problem within a discriminative framework. It is always a challenging task to model the mapping from observation space to state space because of the high-dimensional characteristic in the multimodal conditional distribution. In order to build the mapping, existing techniques usually involve a large set of training samples in the learning process which are limited in their capability to deal with multimodality. We propose, in this work, a novel online sparse Gaussian Process (GP) regression model to recover 3-D human motion in monocular videos. Particularly, we investigate the fact that for a given test input, its output is mainly determined by the training samples potentially residing in its local neighborhood and defined in the unified input-output space. This leads to a local mixture GP experts system composed of different local GP experts, each of which dominates a mapping behavior with the specific covariance function adapting to a local region. To handle the multimodality, we combine both temporal and spatial information therefore to obtain two categories of local experts. The temporal and spatial experts are integrated into a seamless hybrid system, which is automatically self-initialized and robust for visual tracking of nonlinear human motion. Learning and inference are extremely efficient as all the local experts are defined online within very small neighborhoods. Extensive experiments on two real-world databases, HumanEva and PEAR, demonstrate the effectiveness of our proposed model, which significantly improve the performance of existing models.

  10. Towards ambulatory mental stress measurement from physiological parameters

    NARCIS (Netherlands)

    Wijsman, Jacqueline; Vullers, Ruud; Polito, Salvatore; Agell, Carlos; Penders, Julien; Hermens, Hermie

    2013-01-01

    Ambulatory mental stress monitoring requires longterm physiological measurements. This paper presents a data collection protocol for ambulatory recording of physiological parameters for stress measurement purposes. We present a wearable sensor system for ambulatory recording of ECG, EMG, respiration

  11. Self-organizing neural integration of pose-motion features for human action recognition.

    Science.gov (United States)

    Parisi, German I; Weber, Cornelius; Wermter, Stefan

    2015-01-01

    The visual recognition of complex, articulated human movements is fundamental for a wide range of artificial systems oriented toward human-robot communication, action classification, and action-driven perception. These challenging tasks may generally involve the processing of a huge amount of visual information and learning-based mechanisms for generalizing a set of training actions and classifying new samples. To operate in natural environments, a crucial property is the efficient and robust recognition of actions, also under noisy conditions caused by, for instance, systematic sensor errors and temporarily occluded persons. Studies of the mammalian visual system and its outperforming ability to process biological motion information suggest separate neural pathways for the distinct processing of pose and motion features at multiple levels and the subsequent integration of these visual cues for action perception. We present a neurobiologically-motivated approach to achieve noise-tolerant action recognition in real time. Our model consists of self-organizing Growing When Required (GWR) networks that obtain progressively generalized representations of sensory inputs and learn inherent spatio-temporal dependencies. During the training, the GWR networks dynamically change their topological structure to better match the input space. We first extract pose and motion features from video sequences and then cluster actions in terms of prototypical pose-motion trajectories. Multi-cue trajectories from matching action frames are subsequently combined to provide action dynamics in the joint feature space. Reported experiments show that our approach outperforms previous results on a dataset of full-body actions captured with a depth sensor, and ranks among the best results for a public benchmark of domestic daily actions.

  12. Self-Organizing Neural Integration of Pose-Motion Features for Human Action Recognition

    Directory of Open Access Journals (Sweden)

    German Ignacio Parisi

    2015-06-01

    Full Text Available The visual recognition of complex, articulated human movements is fundamental for a wide range of artificial systems oriented towards human-robot communication, action classification, and action-driven perception. These challenging tasks may generally involve the processing of a huge amount of visual information and learning-based mechanisms for generalizing a set of training actions and classifying new samples. To operate in natural environments, a crucial property is the efficient and robust recognition of actions, also under noisy conditions caused by, for instance, systematic sensor errors and temporarily occluded persons. Studies of the mammalian visual system and its outperforming ability to process biological motion information suggest separate neural pathways for the distinct processing of pose and motion features at multiple levels and the subsequent integration of these visual cues for action perception. We present a neurobiologically-motivated approach to achieve noise-tolerant action recognition in real time. Our model consists of self-organizing Growing When Required (GWR networks that obtain progressively generalized representations of sensory inputs and learn inherent spatiotemporal dependencies. During the training, the GWR networks dynamically change their topological structure to better match the input space. We first extract pose and motion features from video sequences and then cluster actions in terms of prototypical pose-motion trajectories. Multi-cue trajectories from matching action frames are subsequently combined to provide action dynamics in the joint feature space. Reported experiments show that our approach outperforms previous results on a dataset of full-body actions captured with a depth sensor, and ranks among the best 21 results for a public benchmark of domestic daily actions.

  13. On the Orientation Error of IMU: Investigating Static and Dynamic Accuracy Targeting Human Motion

    Science.gov (United States)

    Ricci, Luca; Taffoni, Fabrizio

    2016-01-01

    The accuracy in orientation tracking attainable by using inertial measurement units (IMU) when measuring human motion is still an open issue. This study presents a systematic quantification of the accuracy under static conditions and typical human dynamics, simulated by means of a robotic arm. Two sensor fusion algorithms, selected from the classes of the stochastic and complementary methods, are considered. The proposed protocol implements controlled and repeatable experimental conditions and validates accuracy for an extensive set of dynamic movements, that differ in frequency and amplitude of the movement. We found that dynamic performance of the tracking is only slightly dependent on the sensor fusion algorithm. Instead, it is dependent on the amplitude and frequency of the movement and a major contribution to the error derives from the orientation of the rotation axis w.r.t. the gravity vector. Absolute and relative errors upper bounds are found respectively in the range [0.7° ÷ 8.2°] and [1.0° ÷ 10.3°]. Alongside dynamic, static accuracy is thoroughly investigated, also with an emphasis on convergence behavior of the different algorithms. Reported results emphasize critical issues associated with the use of this technology and provide a baseline level of performance for the human motion related application. PMID:27612100

  14. On the Orientation Error of IMU: Investigating Static and Dynamic Accuracy Targeting Human Motion.

    Science.gov (United States)

    Ricci, Luca; Taffoni, Fabrizio; Formica, Domenico

    2016-01-01

    The accuracy in orientation tracking attainable by using inertial measurement units (IMU) when measuring human motion is still an open issue. This study presents a systematic quantification of the accuracy under static conditions and typical human dynamics, simulated by means of a robotic arm. Two sensor fusion algorithms, selected from the classes of the stochastic and complementary methods, are considered. The proposed protocol implements controlled and repeatable experimental conditions and validates accuracy for an extensive set of dynamic movements, that differ in frequency and amplitude of the movement. We found that dynamic performance of the tracking is only slightly dependent on the sensor fusion algorithm. Instead, it is dependent on the amplitude and frequency of the movement and a major contribution to the error derives from the orientation of the rotation axis w.r.t. the gravity vector. Absolute and relative errors upper bounds are found respectively in the range [0.7° ÷ 8.2°] and [1.0° ÷ 10.3°]. Alongside dynamic, static accuracy is thoroughly investigated, also with an emphasis on convergence behavior of the different algorithms. Reported results emphasize critical issues associated with the use of this technology and provide a baseline level of performance for the human motion related application.

  15. Biomechanical investigation of ambulatory training in patients with acetabular dysplasia.

    Science.gov (United States)

    Kanai, Akira; Kiyama, Takahiro; Genda, Eiichi; Suzuki, Yasuo

    2008-07-01

    The purpose of this study was to investigate the effectiveness and safety of ambulatory training in patients with acetabular dysplasia. To achieve this, we studied the hip joint moment in subjects walking with laterally and horizontally elevated arms and changing speeds as a form of training to strengthen hip joint abductor muscles. We studied eight women with pre- or early stage hip disease (center-edge angle of Wieberg 18.5 degrees to -3.0 degrees ) and six healthy women. In exercise task 1 the subjects walked at a rate of 90 steps/min, with abduction of 90 degrees in the shoulder joint ipsilateral or contralateral to the affected hip joint, and either no load or a 1 kg weight in either hand. In exercise task 2, walking speed was changed in three stages from 60 steps/min (s-gait), 90 steps/min (n-gait), and 120 steps/min (f-gait), with both hands swinging freely. Using results from a three-dimensional motion analysis system, the hip joint moments were calculated. In both the healthy and the acetabular dysplasia groups, the abduction moment of the hip joint decreased significantly with ipsilateral elevation and increased significantly with contralateral elevation. There was no significant change in hip flexion moment in either group. The hip extension moment decreased significantly with contralateral elevation, but no significant changes were seen in ipsilateral elevation. In the walking rate variation, the extension hip moment in fast gait was higher than in slow gait. It was concluded that ambulatory training with contralateral horizontal arm elevation may be an effective way of increasing hip joint abductor muscle strength. Ipsilateral arm elevation decreases gluteus medius muscle tension and is an effective way of ambulatory training for people with compensated trendelenburg gait. Variable speed walking is an effective exercise method that can strengthen extensor muscles. Therefore, these ambulatory training methods are useful for acetabular dysplasia patients.

  16. Controlling Urban Lighting by Human Motion Patterns results from a full Scale Experiment

    DEFF Research Database (Denmark)

    Poulsen, Esben Skouboe; Andersen, Hans Jørgen; Jensen, Ole B.;

    2012-01-01

    This paper presents a full-scale experiment investigating the use of human motion intensities as input for interactive illumination of a town square in the city of Aalborg in Denmark. As illuminators sixteen 3.5 meter high RGB LED lamps were used. The activity on the square was monitored by three...... and the immersed persons. The experiment also demonstrated that interactive can give significant power savings. In the current experiment there was a difference of 92% between the most and less energy consuming light scenario...

  17. Complex Human Activity Recognition Using Smartphone and Wrist-Worn Motion Sensors.

    Science.gov (United States)

    Shoaib, Muhammad; Bosch, Stephan; Incel, Ozlem Durmaz; Scholten, Hans; Havinga, Paul J M

    2016-03-24

    The position of on-body motion sensors plays an important role in human activity recognition. Most often, mobile phone sensors at the trouser pocket or an equivalent position are used for this purpose. However, this position is not suitable for recognizing activities that involve hand gestures, such as smoking, eating, drinking coffee and giving a talk. To recognize such activities, wrist-worn motion sensors are used. However, these two positions are mainly used in isolation. To use richer context information, we evaluate three motion sensors (accelerometer, gyroscope and linear acceleration sensor) at both wrist and pocket positions. Using three classifiers, we show that the combination of these two positions outperforms the wrist position alone, mainly at smaller segmentation windows. Another problem is that less-repetitive activities, such as smoking, eating, giving a talk and drinking coffee, cannot be recognized easily at smaller segmentation windows unlike repetitive activities, like walking, jogging and biking. For this purpose, we evaluate the effect of seven window sizes (2-30 s) on thirteen activities and show how increasing window size affects these various activities in different ways. We also propose various optimizations to further improve the recognition of these activities. For reproducibility, we make our dataset publicly available.

  18. On using the Microsoft Kinect$^{\\rm TM}$ sensor in the analysis of human motion

    CERN Document Server

    Malinowski, M J; Roth, S

    2014-01-01

    The present paper explores the possibility of using the Microsoft Kinect$^{\\rm TM}$ sensor in the analysis of human motion; we attempt the validation of the output of the original version of the sensor on the basis of a marker-based system which is assumed to provide the reference solution (baseline, `ground truth'). The similarity between the two outputs is assessed after comparing a number of waveforms, representing the variation within the gait cycle of quantities which are commonly used in order to characterise (and model) motion. The data acquisition involved a commercially-available treadmill and five velocity settings: walking data were acquired at $5$ km/h, running data at $8$, $10$, $11$, and $12$ km/h. The analysis revealed three problems with such an application of the Kinect sensor: the systematic underestimation of the knee angle by about $25 \\%$, the appearance of artefacts in the motion of the lower leg of the subject, and the inability of the sensor to capture reliably the details regarding th...

  19. Ultrasensitive, passive and wearable sensors for monitoring human muscle motion and physiological signals.

    Science.gov (United States)

    Cai, Feng; Yi, Changrui; Liu, Shichang; Wang, Yan; Liu, Lacheng; Liu, Xiaoqing; Xu, Xuming; Wang, Li

    2016-03-15

    Flexible sensors have attracted more and more attention as a fundamental part of anthropomorphic robot research, medical diagnosis and physical health monitoring. Here, we constructed an ultrasensitive and passive flexible sensor with the advantages of low cost, lightness and wearability, electric safety and reliability. The fundamental mechanism of the sensor is based on triboelectric effect inducing electrostatic charges on the surfaces between two different materials. Just like a plate capacitor, current will be generated while the distance or size of the parallel capacitors changes caused by the small mechanical disturbance upon it and therefore the output current/voltage will be produced. Typically, the passive sensor unambiguously monitors muscle motions including hand motion from stretch-clench-stretch, mouth motion from open-bite-open, blink and respiration. Moreover, this sensor records the details of the consecutive phases in a cardiac cycle of the apex cardiogram, and identify the peaks including percussion wave, tidal wave and diastolic wave of the radial pulse wave. To record subtle human physiological signals including radial pulsilogram and apex cardiogram with excellent signal/noise ratio, stability and reproducibility, the sensor shows great potential in the applications of medical diagnosis and daily health monitoring.

  20. Design of a compact low-power human-computer interaction equipment for hand motion

    Science.gov (United States)

    Wu, Xianwei; Jin, Wenguang

    2017-01-01

    Human-Computer Interaction (HCI) raises demand of convenience, endurance, responsiveness and naturalness. This paper describes a design of a compact wearable low-power HCI equipment applied to gesture recognition. System combines multi-mode sense signals: the vision sense signal and the motion sense signal, and the equipment is equipped with the depth camera and the motion sensor. The dimension (40 mm × 30 mm) and structure is compact and portable after tight integration. System is built on a module layered framework, which contributes to real-time collection (60 fps), process and transmission via synchronous confusion with asynchronous concurrent collection and wireless Blue 4.0 transmission. To minimize equipment's energy consumption, system makes use of low-power components, managing peripheral state dynamically, switching into idle mode intelligently, pulse-width modulation (PWM) of the NIR LEDs of the depth camera and algorithm optimization by the motion sensor. To test this equipment's function and performance, a gesture recognition algorithm is applied to system. As the result presents, general energy consumption could be as low as 0.5 W.

  1. Ambulatory spine surgery: a survey study.

    Science.gov (United States)

    Baird, Evan O; Brietzke, Sasha C; Weinberg, Alan D; McAnany, Steven J; Qureshi, Sheeraz A; Cho, Samuel K; Hecht, Andrew C

    2014-08-01

    Study Design Cross-sectional study. Objective To assess the current practices of spine surgeons performing ambulatory surgery in the United States. Methods An electronic survey was distributed to members of the International Society for the Advancement of Spine Surgery. Data were initially examined in a univariate manner; variables with a p value ambulatory spine surgery, and 49.1% were investors in an ambulatory surgery center. Surgeon investors in ambulatory surgery centers were more likely to perform procedures of increased complexity than noninvestors, though limited data precluded a statistical correlation. Surgeons in private practice were more likely to perform ambulatory surgery (94.3%; p = 0.0176), and nonacademic surgeons were both more likely to invest in ambulatory surgery centers (p = 0.0024) and perform surgery at least part of the time in a surgery center (p = 0.0039). Conclusions Though the numbers were too few to calculate statistical significance, there was a trend toward the performance of high-risk procedures on an ambulatory basis being undertaken by those with investment status in an ambulatory center. It is possible that this plays a role in the decision to perform these procedures in this setting versus that of a hospital, where a patient may have better access to care should a complication arise requiring emergent assessment and treatment by a physician. This decision should divest itself of financial incentives and focus entirely on patient safety.

  2. Optimizing anesthesia techniques in the ambulatory setting

    NARCIS (Netherlands)

    E. Galvin

    2007-01-01

    textabstractAmbulatory surgery refers to the process of admitting patients, administering anesthesia and surgical care, and discharging patients home following an appropriate level of recovery on the same day. The word ambulatory is derived from the latin word ambulare, which means ''to walk''. This

  3. Measurements of human force control during a constrained arm motion using a force-actuated joystick.

    Science.gov (United States)

    McIntyre, J; Gurfinkel, E V; Lipshits, M I; Droulez, J; Gurfinkel, V S

    1995-03-01

    1. When interacting with the environment, human arm movements may be prevented in certain directions (i.e., when sliding the hand along a surface) resulting in what is called a "constrained motion." In the directions that the movement is restricted, the subject is instead free to control the forces against the constraint. 2. Control strategies for constrained motion may be characterized by two extreme models. Under the active compliance model, an essentially feedback-based approach, measurements of contact force may be used in real time to modify the motor command and precisely control the forces generated against the constraint. Under the passive compliance model the motion would be executed in a feedforward manner, using an internal model of the constraint geometry. The feedforward model relies on the compliant behavior of the passive mechanical system to maintain contact while avoiding excessive contact forces. 3. Subjects performed a task in which they were required to slide the hand along a rigid surface. This task was performed in a virtual force environment in which contact forces were simulated by a two-dimensional force-actuated joystick. Unknown to the subject, the orientation of the surface constraint was varied from trial to trial, and contact force changes induced by these perturbations were measured. 4. Subjects showed variations in contact force correlated with the direction of the orientation perturbation. "Upward" tilts resulted in higher contact forces, whereas "downward" tilts resulted in lower contact forces. This result is consistent with a feedforward-based control of a passively compliant system. 5. Subject responses did not, however, correspond exactly to the predictions of a static analysis of a passive, feedforward-controlled system. A dynamic analysis reveals a much closer resemblance between a passive, feedforward model and the observed data. Numerical simulations demonstrate that a passive, dynamic system model of the movement captures

  4. Power generation from human body motion through magnet and coil arrays with magnetic spring

    Science.gov (United States)

    Zhang, Qian; Wang, Yufeng; Kim, Eun Sok

    2014-02-01

    This article presents a hand-held electromagnetic energy harvester which can be used to harvest tens of mW power level from human body motion. A magnet array, aligned to a coil array for maximum magnetic flux change, is suspended by a magnetic spring for a resonant frequency of several Hz and is stabilized horizontally by graphite sheets for reducing the friction. An analytical model of vibration-driven energy harvester with magnetic spring through magnet and coil arrays is developed to explore the power generation from vibrations at low frequency and large amplitude. When the energy harvester (occupying 120 cc and weighing 180 g) is placed in a backpack of a human walking at various speeds, the power output increases as the walking speed increases from 0.45 m/s (slow walking) to 3.58 m/s (slow running), and reaches 32 mW at 3.58 m/s.

  5. Time dependent human hip joint lubrication for periodic motion with stochastic asymmetric density function.

    Science.gov (United States)

    Wierzcholski, Krzysztof

    2014-01-01

    The present paper is concerned with the calculation of the human hip joint parameters for periodic, stochastic unsteady, motion with asymmetric probability density function for gap height. The asymmetric density function indicates that the stochastic probabilities of gap height decreasing are different in comparison with the probabilities of the gap height increasing. The models of asymmetric density functions are considered on the grounds of experimental observations. Some methods are proposed for calculation of pressure distributions and load carrying capacities for unsteady stochastic conditions in a super thin layer of biological synovial fluid inside the slide biobearing gap limited by a spherical bone acetabulum. Numerical calculations are performed in Mathcad 12 Professional Program, by using the method of finite differences. This method assures stability of numerical solutions of partial differential equations and gives proper values of pressure and load carrying capacity forces occurring in human hip joints.

  6. Mathematics of Human Motion: from Animation towards Simulation (A View form the Outside)

    CERN Document Server

    Zhmakin, A I

    2011-01-01

    Simulation of human motion is the subject of study in a number of disciplines: Biomechanics, Robotics, Computer Animation, Control Theory, Neurophysiology, Medicine, Ergonomics. Since the author has never visited any of these fields, this review is indeed a passer-by's impression. On the other hand, he happens to be a human (who occasionally is moving) and, as everybody else, rates himself an expert in Applied Common Sense. Thus the author hopes that this view from the {\\em outside} will be of some interest not only for the strangers like himself, but for those who are {\\em inside} as well. Two flaws of the text that follows are inevitable. First, some essential issues that are too familar to the specialists to discuss them may be missing. Second, the author probably failed to provide the uniform "level-of-detail" for this wide range of topics.

  7. Significant Change Spotting for Periodic Human Motion Segmentation of Cleaning Tasks Using Wearable Sensors

    Directory of Open Access Journals (Sweden)

    Kai-Chun Liu

    2017-01-01

    Full Text Available The proportion of the aging population is rapidly increasing around the world, which will cause stress on society and healthcare systems. In recent years, advances in technology have created new opportunities for automatic activities of daily living (ADL monitoring to improve the quality of life and provide adequate medical service for the elderly. Such automatic ADL monitoring requires reliable ADL information on a fine-grained level, especially for the status of interaction between body gestures and the environment in the real-world. In this work, we propose a significant change spotting mechanism for periodic human motion segmentation during cleaning task performance. A novel approach is proposed based on the search for a significant change of gestures, which can manage critical technical issues in activity recognition, such as continuous data segmentation, individual variance, and category ambiguity. Three typical machine learning classification algorithms are utilized for the identification of the significant change candidate, including a Support Vector Machine (SVM, k-Nearest Neighbors (kNN, and Naive Bayesian (NB algorithm. Overall, the proposed approach achieves 96.41% in the F1-score by using the SVM classifier. The results show that the proposed approach can fulfill the requirement of fine-grained human motion segmentation for automatic ADL monitoring.

  8. Significant Change Spotting for Periodic Human Motion Segmentation of Cleaning Tasks Using Wearable Sensors

    Science.gov (United States)

    Liu, Kai-Chun; Chan, Chia-Tai

    2017-01-01

    The proportion of the aging population is rapidly increasing around the world, which will cause stress on society and healthcare systems. In recent years, advances in technology have created new opportunities for automatic activities of daily living (ADL) monitoring to improve the quality of life and provide adequate medical service for the elderly. Such automatic ADL monitoring requires reliable ADL information on a fine-grained level, especially for the status of interaction between body gestures and the environment in the real-world. In this work, we propose a significant change spotting mechanism for periodic human motion segmentation during cleaning task performance. A novel approach is proposed based on the search for a significant change of gestures, which can manage critical technical issues in activity recognition, such as continuous data segmentation, individual variance, and category ambiguity. Three typical machine learning classification algorithms are utilized for the identification of the significant change candidate, including a Support Vector Machine (SVM), k-Nearest Neighbors (kNN), and Naive Bayesian (NB) algorithm. Overall, the proposed approach achieves 96.41% in the F1-score by using the SVM classifier. The results show that the proposed approach can fulfill the requirement of fine-grained human motion segmentation for automatic ADL monitoring. PMID:28106853

  9. Blood cultures in ambulatory outpatients

    Directory of Open Access Journals (Sweden)

    Laupland Kevin B

    2005-05-01

    Full Text Available Abstract Background Blood cultures are a gold standard specific test for diagnosing many infections. However, the low yield may limit their usefulness, particularly in low-risk populations. This study was conducted to assess the utility of blood cultures drawn from ambulatory outpatients. Methods Blood cultures drawn at community-based collection sites in the Calgary Health Region (population 1 million in 2001 and 2002 were included in this study. These patients were analyzed by linkages to acute care health care databases for utilization of acute care facilities within 2 weeks of blood culture draw. Results 3102 sets of cultures were drawn from 1732 ambulatory outpatients (annual rate = 89.4 per 100,000 population. Significant isolates were identified from 73 (2.4% sets of cultures from 51 patients, including Escherichia coli in 18 (35% and seven (14% each of Staphylococcus aureus and Streptococcus pneumoniae. Compared to patients with negative cultures, those with positive cultures were older (mean 49.6 vs. 40.1 years, p Conclusion Blood cultures drawn in outpatient settings are uncommonly positive, but may define patients for increased intensity of therapy. Strategies to reduce utilization without excluding patients with positive cultures need to be developed for this patient population.

  10. Artificial neural network-based classification of body movements in ambulatory ECG signal.

    Science.gov (United States)

    Darji, Sachin T; Kher, Rahul K

    2013-11-01

    Abstract Ambulatory ECG monitoring provides electrical activity of the heart when a person is involved in doing normal routine activities. Thus, the recorded ECG signal consists of cardiac signal along with motion artifacts introduced due to a person's body movements during routine activities. Detection of motion artifacts due to different physical activities might help in further cardiac diagnosis. Ambulatory ECG signal analysis for detection of various motion artifacts using adaptive filtering approach is addressed in this paper. We have used BIOPAC MP 36 system for acquiring ECG signal. The ECG signals of five healthy subjects (aged between 22-30 years) were recorded while the person performed various body movements like up and down movement of the left hand, up and down movement of the right hand, waist twisting movement while standing and change from sitting down on a chair to standing up movement in lead I configuration. An adaptive filter-based approach has been used to extract the motion artifact component from the ambulatory ECG signal. The features of motion artifact signal, extracted using Gabor transform, have been used to train the artificial neural network (ANN) for classifying body movements.

  11. Evaluating Effectiveness of Modeling Motion System Feedback in the Enhanced Hess Structural Model of the Human Operator

    Science.gov (United States)

    Zaychik, Kirill; Cardullo, Frank; George, Gary; Kelly, Lon C.

    2009-01-01

    In order to use the Hess Structural Model to predict the need for certain cueing systems, George and Cardullo significantly expanded it by adding motion feedback to the model and incorporating models of the motion system dynamics, motion cueing algorithm and a vestibular system. This paper proposes a methodology to evaluate effectiveness of these innovations by performing a comparison analysis of the model performance with and without the expanded motion feedback. The proposed methodology is composed of two stages. The first stage involves fine-tuning parameters of the original Hess structural model in order to match the actual control behavior recorded during the experiments at NASA Visual Motion Simulator (VMS) facility. The parameter tuning procedure utilizes a new automated parameter identification technique, which was developed at the Man-Machine Systems Lab at SUNY Binghamton. In the second stage of the proposed methodology, an expanded motion feedback is added to the structural model. The resulting performance of the model is then compared to that of the original one. As proposed by Hess, metrics to evaluate the performance of the models include comparison against the crossover models standards imposed on the crossover frequency and phase margin of the overall man-machine system. Preliminary results indicate the advantage of having the model of the motion system and motion cueing incorporated into the model of the human operator. It is also demonstrated that the crossover frequency and the phase margin of the expanded model are well within the limits imposed by the crossover model.

  12. A miniaturized human-motion energy harvester using flux-guided magnet stacks

    Science.gov (United States)

    Halim, M. A.; Park, J. Y.

    2016-11-01

    We present a miniaturized electromagnetic energy harvester (EMEH) using two flux-guided magnet stacks to harvest energy from human-generated vibration such as handshaking. Each flux-guided magnet stack increases (40%) the magnetic flux density by guiding the flux lines through a soft magnetic material. The EMEH has been designed to up-convert the applied human-motion vibration to a high-frequency oscillation by mechanical impact of a spring-less structure. The high-frequency oscillator consists of the analyzed 2-magnet stack and a customized helical compression spring. A standard AAA battery sized prototype (3.9 cm3) can generate maximum 203 μW average power from human hand-shaking vibration. It has a maximum average power density of 52 μWcm-3 which is significantly higher than the current state-of-the-art devices. A 6-stage multiplier and rectifier circuit interfaces the harvester with a wearable electronic load (wrist watch) to demonstrate its capability of powering small- scale electronic systems from human-generated vibration.

  13. Appraising the Recital of Joints in Human Running Gait through 3D Optical Motion

    Directory of Open Access Journals (Sweden)

    Sajid Ali

    2013-04-01

    Full Text Available Recital costing of Joints in human running is biometrics evaluation technology. It has skillful series of realizations in scientific research in the last decade. In this work, we present a human running joints (hip, knee and ankle valuation recital based on the statistical computation techniques. We use the One-way ANOVA, least significant difference (LSD test and Bartlett's test for equality of variances to determine which joint has more variation with others joints during human running gait. These three joints rotation angle data were computed from the Biovision Hierarchical data (BVH motion file, because these joints provide the richest information of the human lower body joints (hip, knee and ankle. The use of BVH file to estimate the participation and performance of the joints during running gait is a novel feature of our study. The experimental results indicated that, the knee joint has the decisive influence (variation as compared to the other two joints, hip and ankle, during running gait.

  14. Contact-state classification in human-demonstrated robot compliant motion tasks using the boosting algorithm.

    Science.gov (United States)

    Cabras, Stefano; Castellanos, María Eugenia; Staffetti, Ernesto

    2010-10-01

    Robot programming by demonstration is a robot programming paradigm in which a human operator directly demonstrates the task to be performed. In this paper, we focus on programming by demonstration of compliant motion tasks, which are tasks that involve contacts between an object manipulated by the robot and the environment in which it operates. Critical issues in this paradigm are to distinguish essential actions from those that are not relevant for the correct execution of the task and to transform this information into a robot-independent representation. Essential actions in compliant motion tasks are the contacts that take place, and therefore, it is important to understand the sequence of contact states that occur during a demonstration, called contact classification or contact segmentation. We propose a contact classification algorithm based on a supervised learning algorithm, in particular on a stochastic gradient boosting algorithm. The approach described in this paper is accurate and does not depend on the geometric model of the objects involved in the demonstration. It neither relies on the kinestatic model of the contact interactions nor on the contact state graph, whose computation is usually of prohibitive complexity even for very simple geometric object models.

  15. The human translational vestibulo-ocular reflex in response to complex motion.

    Science.gov (United States)

    Walker, Mark; Liao, Ke

    2011-09-01

    We studied the translational vestibulo-ocular reflex (tVOR) in four healthy human subjects during complex, unpredictable sum-of-sines head motion (combination of 0.73, 1.33, 1.93, and 2.93 Hz), while subjects viewed a target 15 cm away. Ideal eye velocity was calculated from recorded head motion; actual eye velocity was measured with scleral coils. The gain and phase for each frequency component was determined by least-squares optimization. Gain averaged approximately 40% and did not change with frequency; phase lag increased with frequency to a maximum of 66°. Fitting actual to ideal eye velocity predicted a tVOR latency of 48 m/s for vertical and 38 m/s for horizontal translation. These findings provide further evidence that the normal tVOR is considerably undercompensatory, even at low frequencies if the stimulus is not predictable. The similarity of this behavior to that of pursuit suggests that these two eye movements may share some aspects of neural processing.

  16. Human motion energy harvesting: numerical analysis of electromagnetic swing-excited structures

    Science.gov (United States)

    Ylli, K.; Hoffmann, D.; Willmann, A.; Folkmer, B.; Manoli, Y.

    2016-09-01

    Energy harvesting from human motion has constantly attracted scientific interest over recent years. A location where a harvesting device can easily and unobtrusively be integrated is the shoe sole, which also protects the device from exterior influences. In this work a numerical system model is developed, which can be used to simulate different inductive harvester geometries and predict their power output. Real world acceleration data is used as a model input. The model is implemented in Matlab/Simulink and subdivided into a mechanical and an electromagnetic model. The key features including the motion model and the calculation of the electromagnetic coupling coefficient are explained in detail and the model is briefly evaluated experimentally. A total of six inductive architectures, i.e. different cylindrical and rectangular magnet-coil arrangements, are then investigated in detail. The geometrical parameters are optimized for each architecture to find the best geometry within the size of 71 mm × 37.5 mm × 12.5 mm, which can be integrated into the sole. With the best overall design an average power output of 42.7 mW is simulated across an ohmic load of 41 Ohms. In addition to the respective best designs, the (dis-)advantages of each architecture are explained.

  17. Functional mapping of the human visual cortex with intravoxel incoherent motion MRI.

    Directory of Open Access Journals (Sweden)

    Christian Federau

    Full Text Available Functional imaging with intravoxel incoherent motion (IVIM magnetic resonance imaging (MRI is demonstrated. Images were acquired at 3 Tesla using a standard Stejskal-Tanner diffusion-weighted echo-planar imaging sequence with multiple b-values. Cerebro-spinal fluid signal, which is highly incoherent, was suppressed with an inversion recovery preparation pulse. IVIM microvascular perfusion parameters were calculated according to a two-compartment (vascular and non-vascular diffusion model. The results obtained in 8 healthy human volunteers during visual stimulation are presented. The IVIM blood flow related parameter fD* increased 170% during stimulation in the visual cortex, and 70% in the underlying white matter.

  18. Human motion tracking using mean shift clustering and discrete cosine transform

    Science.gov (United States)

    Islam, M. M.; Alam, M. S.

    2007-04-01

    Human motion tracking is an active area of research in computer vision and machine intelligence. It has many applications in video surveillance and human-computer interface. Most of the existing algorithms track multiple humans in a given image. This paper proposes a detection approach which can track a specific person from a crowded environment. Mean shift clustering algorithm is employed in the difference image to get the candidate cluster which is found to converge within few iterations. The number of clusters and the cluster centers are automatically derived by mode seeking with the mean shift procedure. Discrete cosine transform is applied to each cluster and to the known target to extract features of the clusters and the target. To get the target cluster from a given image, Mahalanobis distance is measured between each transformed candidate cluster and the target. The cluster with the minimum distance is taken as the desired target. Tracking is carried out by updating the cluster parameters over time using the mean shift procedure.

  19. OCT Study of Mechanical Properties Associated with Trabecular Meshwork and Collector Channel Motion in Human Eyes

    Science.gov (United States)

    Xin, Chen; Johnstone, Murray; Wang, Ningli; Wang, Ruikang K.

    2016-01-01

    We report the use of a high-resolution optical coherence tomography (OCT) imaging platform to identify and quantify pressure-dependent aqueous outflow system (AOS) tissue relationships and to infer mechanical stiffness through examination of tissue properties in ex vivo human eyes. Five enucleated human eyes are included in this study, with each eye prepared with four equal-sized quadrants, each encompassing 90 degrees of the limbal circumference. In radial limbal segments perfusion pressure within Schlemm’s canal (SC) is controlled by means of a perfusion cannula inserted into the canal lumen, while the other end of the cannula leads to a reservoir at a height that can control the pressure in the cannula. The OCT system images the sample with a spatial resolution of about 5 μm from the trabecular meshwork (TM) surface. Geometric parameters are quantified from the 2D OCT images acquired from the sample subjected to controlled changes in perfusion pressures; parameters include area and height of the lumen of SC, collector channel entrances (CCE) and intrascleral collector channels (ISCC). We show that 3D OCT imaging permits the identification of 3-D relationships of the SC, CCE and ISCC lumen dimensions. Collagen flaps or leaflets are found at CCE that are attached or hinged at only one end, whilst the flaps are connected to the TM by cylindrical structures spanning SC. Increasing static SC pressures resulted in SC lumen enlargement with corresponding enlargement of the CCE and ISCC lumen. Pressure-dependent SC lumen area and height changes are significant at the 0.01 levels for ANOVA, and at the 0.05 for both polynomial curves and Tukey paired comparisons. Dynamic measurements demonstrate a synchronous increase in SC, CCE and ISCC lumen height in response to pressure changes from 0 to 10, 30 or 50 mm Hg, respectively, and the response time is within the 50-millisecond range. From the measured SC volume and corresponding IOP values, we demonstrate that an

  20. Discrimination of Human Forearm Motions on the Basis of Myoelectric Signals by Using Adaptive Fuzzy Inference System

    Science.gov (United States)

    Kiso, Atsushi; Seki, Hirokazu

    This paper describes a method for discriminating of the human forearm motions based on the myoelectric signals using an adaptive fuzzy inference system. In conventional studies, the neural network is often used to estimate motion intention by the myoelectric signals and realizes the high discrimination precision. On the other hand, this study uses the fuzzy inference for a human forearm motion discrimination based on the myoelectric signals. This study designs the membership function and the fuzzy rules using the average value and the standard deviation of the root mean square of the myoelectric potential for every channel of each motion. In addition, the characteristics of the myoelectric potential gradually change as a result of the muscle fatigue. Therefore, the motion discrimination should be performed by taking muscle fatigue into consideration. This study proposes a method to redesign the fuzzy inference system such that dynamic change of the myoelectric potential because of the muscle fatigue will be taken into account. Some experiments carried out using a myoelectric hand simulator show the effectiveness of the proposed motion discrimination method.

  1. Redesigning ambulatory care business processes supporting clinical care delivery.

    Science.gov (United States)

    Patterson, C; Sinkewich, M; Short, J; Callas, E

    1997-04-01

    The first step in redesigning the health care delivery process for ambulatory care begins with the patient and the business processes that support the patient. Patient-related business processes include patient access, service documentation, billing, follow-up, collection, and payment. Access is the portal to the clinical delivery and care management process. Service documentation, charge capture, and payment and collection are supporting processes to care delivery. Realigned provider networks now demand realigned patient business services to provide their members/customers/patients with improved service delivery at less cost. Purchaser mandates for cost containment, health maintenance, and enhanced quality of care have created an environment where every aspect of the delivery system, especially ambulatory care, is being judged. Business processes supporting the outpatient are therefore being reexamined for better efficiency and customer satisfaction. Many health care systems have made major investments in their ambulatory care environment, but have pursued traditional supporting business practices--such as multiple access points, lack of integrated patient appointment scheduling and registration, and multiple patient bills. These are areas that are appropriate for redesign efforts--all with the customer's needs and convenience in mind. Similarly, setting unrealistic expectations, underestimating the effort required, and ignoring the human elements of a patient-focused business service redesign effort can sabotage the very sound reasons for executing such an endeavor. Pitfalls can be avoided if a structured methodology, coupled with a change management process, are employed. Deloitte & Touche Consulting Group has been involved in several major efforts, all with ambulatory care settings to assist with the redesign of their business practices to consider the patient as the driver, instead of the institution providing the care.

  2. Hand gesture recognition based on motion history images for a simple human-computer interaction system

    Science.gov (United States)

    Timotius, Ivanna K.; Setyawan, Iwan

    2013-03-01

    A human-computer interaction can be developed using several kind of tools. One choice is using images captured using a camera. This paper proposed a simple human-computer interaction system based on hand movement captured by a web camera. The system aims to classify the captured movement into one of three classes. The first two classes contain hand movements to the left and right, respectively. The third class contains non-hand movements or hand movements to other directions. The method used in this paper is based on Motion History Images (MHIs) and nearest neighbor classifier. The resulting MHIs are processed in two manners, namely by summing the pixel values along the vertical axis and reshaping into vectors. We also use two distance criteria in this paper, respectively the Euclidian distance and cross correlation. This paper compared the performance of the combinations of different MHI data processing and distance criteria using 10 runs of 2-fold cross validation. Our experiments show that reshaping the MHI data into vectors combined with a Euclidean distance criterion gives the highest average accuracy, namely 55.67%.

  3. Detection of (Inactivity Periods in Human Body Motion Using Inertial Sensors: A Comparative Study

    Directory of Open Access Journals (Sweden)

    Miguel Damas

    2012-05-01

    Full Text Available Determination of (inactivity periods when monitoring human body motion is a mandatory preprocessing step in all human inertial navigation and position analysis applications. Distinction of (inactivity needs to be established in order to allow the system to recompute the calibration parameters of the inertial sensors as well as the Zero Velocity Updates (ZUPT of inertial navigation. The periodical recomputation of these parameters allows the application to maintain a constant degree of precision. This work presents a comparative study among different well known inertial magnitude-based detectors and proposes a new approach by applying spectrum-based detectors and memory-based detectors. A robust statistical comparison is carried out by the use of an accelerometer and angular rate signal synthesizer that mimics the output of accelerometers and gyroscopes when subjects are performing basic activities of daily life. Theoretical results are verified by testing the algorithms over signals gathered using an Inertial Measurement Unit (IMU. Detection accuracy rates of up to 97% are achieved.

  4. Markerless human motion tracking using hierarchical multi-swarm cooperative particle swarm optimization.

    Science.gov (United States)

    Saini, Sanjay; Zakaria, Nordin; Rambli, Dayang Rohaya Awang; Sulaiman, Suziah

    2015-01-01

    The high-dimensional search space involved in markerless full-body articulated human motion tracking from multiple-views video sequences has led to a number of solutions based on metaheuristics, the most recent form of which is Particle Swarm Optimization (PSO). However, the classical PSO suffers from premature convergence and it is trapped easily into local optima, significantly affecting the tracking accuracy. To overcome these drawbacks, we have developed a method for the problem based on Hierarchical Multi-Swarm Cooperative Particle Swarm Optimization (H-MCPSO). The tracking problem is formulated as a non-linear 34-dimensional function optimization problem where the fitness function quantifies the difference between the observed image and a projection of the model configuration. Both the silhouette and edge likelihoods are used in the fitness function. Experiments using Brown and HumanEva-II dataset demonstrated that H-MCPSO performance is better than two leading alternative approaches-Annealed Particle Filter (APF) and Hierarchical Particle Swarm Optimization (HPSO). Further, the proposed tracking method is capable of automatic initialization and self-recovery from temporary tracking failures. Comprehensive experimental results are presented to support the claims.

  5. Integrated multilayered triboelectric nanogenerator for harvesting biomechanical energy from human motions.

    Science.gov (United States)

    Bai, Peng; Zhu, Guang; Lin, Zong-Hong; Jing, Qingshen; Chen, Jun; Zhang, Gong; Ma, Jusheng; Wang, Zhong Lin

    2013-04-23

    We demonstrate a new flexible multilayered triboelectric nanogenerator (TENG) with extremely low cost, simple structure, small size (3.8 cm×3.8 cm×0.95 cm) and lightweight (7 g) by innovatively integrating five layers of units on a single flexible substrate. Owing to the unique structure and nanopore-based surface modification on the metal surface, the instantaneous short-circuit current (Isc) and the open-circuit voltage (Voc) could reach 0.66 mA and 215 V with an instantaneous maximum power density of 9.8 mW/cm2 and 10.24 mW/cm3. This is the first 3D integrated TENG for enhancing the output power. Triggered by press from normal walking, the TENG attached onto a shoe pad was able to instantaneously drive multiple commercial LED bulbs. With the flexible structure, the TENG can be further integrated into clothes or even attached onto human body without introducing sensible obstruction and discomfort to human motions. The novel design of TENG demonstrated here can be applied to potentially achieve self-powered portable electronics.

  6. Combining High-Speed Cameras and Stop-Motion Animation Software to Support Students' Modeling of Human Body Movement

    Science.gov (United States)

    Lee, Victor R.

    2015-01-01

    Biomechanics, and specifically the biomechanics associated with human movement, is a potentially rich backdrop against which educators can design innovative science teaching and learning activities. Moreover, the use of technologies associated with biomechanics research, such as high-speed cameras that can produce high-quality slow-motion video,…

  7. A New Approach for Human Forearm Motion Assist by Actuated Artificial Joint-An Inner Skeleton Robot

    Science.gov (United States)

    Kundu, Subrata Kumar; Kiguchi, Kazuo; Teramoto, Kenbu

    In order to help the physical activities of the elderly or physically disabled persons, we propose a new concept of a power-assist inner skeleton robot (i.e., actuated artificial joint) that is supposed to assist the human daily life motion from inside of the human body. This paper presents an implantable 2 degree of freedom (DOF) inner skeleton robot that is designed to assist human elbow flexion-extension motion and forearm supination-pronation motion for daily life activities. We have developed a prototype of the inner skeleton robot that is supposed to assist the motion from inside of the body and act as an actuated artificial joint. The proposed system is controlled based on the activation patterns of the electromyogram (EMG) signals of the user's muscles by applying fuzzy-neuro control method. A joint actuator with angular position sensor is designed for the inner skeleton robot and a T-Mechanism is proposed to keep the bone arrangement similar to the normal human articulation after the elbow arthroplasty. The effectiveness of the proposed system has been evaluated by experiment.

  8. Investigation of human cervical and upper thoracic spinal cord motion: implications for imaging spinal cord structure and function.

    Science.gov (United States)

    Figley, C R; Stroman, P W

    2007-07-01

    Spinal cord (SC) motion is thought to be the dominant source of error in current diffusion and spinal functional MRI (fMRI) methods. However, until now, such motion has not been well characterized in three dimensions. While previous studies have predominantly examined motion in the superior/inferior (S/I) direction, the foci of the present study were the anterior/posterior (A/P) and right/left (R/L) components of human cervical and upper thoracic SC motion. Cardiac-gated, turbofast low-angle shot (turbo-FLASH) cinematic MRI was employed at 3T to acquire images of the cord at 24 phases throughout the cardiac cycle. Time-dependent signal fluctuations within voxels adjacent to the cord/cerebrospinal fluid (CSF) interface were then used to measure SC motion, which was found to occur predictably as a function of cardiac activity. Cord movement was largest in the A/P direction, for which principal components of motion were calculated, thereby indicating consistent patterns of SC oscillation that can potentially be used to improve SC imaging.

  9. Wearable and superhydrophobic hardware for ambulatory biopotential acquisition.

    Science.gov (United States)

    Martinez-Tabares, F J; Delgado-Trejos, E; Castellanos-Dominguez, G

    2013-01-01

    Wearable monitoring devices are a promising trend for ambulatory and real time biosignal processing, because they improve access and coverage by means of comfortable sensors, with real-time communication via mobile networks. In this paper, we present a garment for ambulatory electrocardiogram monitoring, a smart t-shirt with a textile electrode that conducts electricity and has a coating designed to preserve the user's hygiene, allowing long-term mobile measurements. Silicon dioxide nanoparticles were applied on the surface of the textile electrodes to preserve conductivity and impart superhydrophobic properties. A model to explain these results is proposed. The best result of this study is obtained when the contact angles between the fluid and the fabric exceeded 150°, while the electrical resistivity remained below 5 Ω·cm, allowing an acquisition of high quality electrocardiograms in moving patients. Thus, this tool represents an interesting alternative for medium and long-term measurements, preserving the textile feeling of clothing and working under motion conditions.

  10. Compensation of Wave-Induced Motion and Force Phenomena for Ship-Based High Performance Robotic and Human Amplifying Systems

    Energy Technology Data Exchange (ETDEWEB)

    Love, LJL

    2003-09-24

    The decrease in manpower and increase in material handling needs on many Naval vessels provides the motivation to explore the modeling and control of Naval robotic and robotic assistive devices. This report addresses the design, modeling, control and analysis of position and force controlled robotic systems operating on the deck of a moving ship. First we provide background information that quantifies the motion of the ship, both in terms of frequency and amplitude. We then formulate the motion of the ship in terms of homogeneous transforms. This transformation provides a link between the motion of the ship and the base of a manipulator. We model the kinematics of a manipulator as a serial extension of the ship motion. We then show how to use these transforms to formulate the kinetic and potential energy of a general, multi-degree of freedom manipulator moving on a ship. As a demonstration, we consider two examples: a one degree-of-freedom system experiencing three sea states operating in a plane to verify the methodology and a 3 degree of freedom system experiencing all six degrees of ship motion to illustrate the ease of computation and complexity of the solution. The first series of simulations explore the impact wave motion has on tracking performance of a position controlled robot. We provide a preliminary comparison between conventional linear control and Repetitive Learning Control (RLC) and show how fixed time delay RLC breaks down due to the varying nature wave disturbance frequency. Next, we explore the impact wave motion disturbances have on Human Amplification Technology (HAT). We begin with a description of the traditional HAT control methodology. Simulations show that the motion of the base of the robot, due to ship motion, generates disturbances forces reflected to the operator that significantly degrade the positioning accuracy and resolution at higher sea states. As with position-controlled manipulators, augmenting the control with a Repetitive

  11. Human Control Law and Brain Activity of Voluntary Motion by Utilizing a Balancing Task with an Inverted Pendulum

    Directory of Open Access Journals (Sweden)

    Satoshi Suzuki

    2010-01-01

    Full Text Available Human characteristics concerning voluntary motion control are investigated, because this motion is fundamental for the machine operation and human-computer system. Using a force feedback haptic device and a balancing task of a virtual inverted pendulum, participants were trained in the task, and hand motion/force was measured, and brain activity was monitored. First, through brain analysis by near-infrared spectroscopy (NIRS and motion analysis of the pendulum, we identified a participant who was the most expert. Next, control characteristics of the most expert were investigated by considering the operational force and delay factor of a human. As a result, it was found that predictive control based on velocity information was used predominantly although a perception feedback control against the pendulum posture worked. And it was shown that an on-off intermittency control, which was a strategy for the skilled balancing, can be described well by a liner model involving two types of time shifts for the position and velocity. In addition, it was confirmed that the cortex activity for observation in an ocular motor control area and visual processing area was strong to enhance above-mentioned control strategies.

  12. Highly Stretchable and Transparent Microfluidic Strain Sensors for Monitoring Human Body Motions.

    Science.gov (United States)

    Yoon, Sun Geun; Koo, Hyung-Jun; Chang, Suk Tai

    2015-12-16

    We report a new class of simple microfluidic strain sensors with high stretchability, transparency, sensitivity, and long-term stability with no considerable hysteresis and a fast response to various deformations by combining the merits of microfluidic techniques and ionic liquids. The high optical transparency of the strain sensors was achieved by introducing refractive-index matched ionic liquids into microfluidic networks or channels embedded in an elastomeric matrix. The microfluidic strain sensors offer the outstanding sensor performance under a variety of deformations induced by stretching, bending, pressing, and twisting of the microfluidic strain sensors. The principle of our microfluidic strain sensor is explained by a theoretical model based on the elastic channel deformation. In order to demonstrate its capability of practical usage, the simple-structured microfluidic strain sensors were performed onto a finger, wrist, and arm. The highly stretchable and transparent microfluidic strain sensors were successfully applied as potential platforms for distinctively monitoring a wide range of human body motions in real time. Our novel microfluidic strain sensors show great promise for making future stretchable electronic devices.

  13. Highly Stretchable, Hysteresis-Free Ionic Liquid-Based Strain Sensor for Precise Human Motion Monitoring.

    Science.gov (United States)

    Choi, Dong Yun; Kim, Min Hyeong; Oh, Yong Suk; Jung, Soo-Ho; Jung, Jae Hee; Sung, Hyung Jin; Lee, Hyung Woo; Lee, Hye Moon

    2017-01-18

    A highly stretchable, low-cost strain sensor was successfully prepared using an extremely cost-effective ionic liquid of ethylene glycol/sodium chloride. The hysteresis performance of the ionic-liquid-based sensor was able to be improved by introducing a wavy-shaped fluidic channel diminishing the hysteresis by the viscoelastic relaxation of elastomers. From the simulations on visco-hyperelastic behavior of the elastomeric channel, we demonstrated that the wavy structure can offer lower energy dissipation compared to a flat structure under a given deformation. The resistance response of the ionic-liquid-based wavy (ILBW) sensor was fairly deterministic with no hysteresis, and it was well-matched to the theoretically estimated curves. The ILBW sensors exhibited a low degree of hysteresis (0.15% at 250%), low overshoot (1.7% at 150% strain), and outstanding durability (3000 cycles at 300% strain). The ILBW sensor has excellent potential for use in precise and quantitative strain detections in various areas, such as human motion monitoring, healthcare, virtual reality, and smart clothes.

  14. Caveat of measuring perfusion indexes using intravoxel incoherent motion magnetic resonance imaging in the human brain

    Energy Technology Data Exchange (ETDEWEB)

    Wu, Wen-Chau [National Taiwan University, Graduate Institute of Oncology, Taipei (China); National Taiwan University, Graduate Institute of Clinical Medicine, Taipei (China); National Taiwan University, Graduate Institute of Biomedical Electronics and Bioinformatics, Taipei (China); National Taiwan University Hospital, Department of Medical Imaging, Taipei (China); Chen, Ya-Fang; Yang, Shun-Chung; My, Pei-Chi [National Taiwan University Hospital, Department of Medical Imaging, Taipei (China); Tseng, Han-Min [National Taiwan University Hospital, Department of Neurology, Taipei (China)

    2015-08-15

    To numerically and experimentally investigate the robustness of intravoxel incoherent motion (IVIM) magnetic resonance imaging in measuring perfusion indexes in the human brain. Eighteen healthy volunteers were imaged on a 3 T clinical system. Data of IVIM imaging (12 b-values ranging from 0 to 1000 s/mm{sup 2}, 12 repetitions) were fitted with a bi-exponential model to extract blood volume fraction (f) and pseudo-diffusion coefficient (D*). The robustness of measurement was assessed by bootstrapping. Dynamic susceptibility contrast (DSC) imaging and arterial spin-labelling (ASL) imaging were performed for cross-modal comparison. Numerical simulations were performed to assess the accuracy and precision of f and D* estimates at varied signal-to-noise ratio (SNR{sub b1000}). Based on our experimental setting (SNR{sub b1000} ∝ 30), the average error/variability is ∝ 5 %/25 % for f and ∝ 100 %/30 % for D* in gray matter, and ∝ 10 %/50 % for f and ∝ 300 %/60 % for D* in white matter. Correlation was found between f and DSC-derived cerebral blood volume in gray matter (r = 0.29 - 0.48 across subjects, p < 10{sup -5}), but not in white matter. No correlation was found between f-D* product and ASL-derived cerebral blood flow. f may provide noninvasive measurement of cerebral blood volume, particularly in gray matter. D* has limited robustness and should be interpreted with caution. (orig.)

  15. Dealing with Magnetic Disturbances in Human Motion Capture: A Survey of Techniques

    Directory of Open Access Journals (Sweden)

    Gabriele Ligorio

    2016-03-01

    Full Text Available Magnetic-Inertial Measurement Units (MIMUs based on microelectromechanical (MEMS technologies are widespread in contexts such as human motion tracking. Although they present several advantages (lightweight, size, cost, their orientation estimation accuracy might be poor. Indoor magnetic disturbances represent one of the limiting factors for their accuracy, and, therefore, a variety of work was done to characterize and compensate them. In this paper, the main compensation strategies included within Kalman-based orientation estimators are surveyed and classified according to which degrees of freedom are affected by the magnetic data and to the magnetic disturbance rejection methods implemented. By selecting a representative method from each category, four algorithms were obtained and compared in two different magnetic environments: (1 small workspace with an active magnetic source; (2 large workspace without active magnetic sources. A wrist-worn MIMU was used to acquire data from a healthy subject, whereas a stereophotogrammetric system was adopted to obtain ground-truth data. The results suggested that the model-based approaches represent the best compromise between the two testbeds. This is particularly true when the magnetic data are prevented to affect the estimation of the angles with respect to the vertical direction.

  16. Study of human body: Kinematics and kinetics of a martial arts (Silat) performers using 3D-motion capture

    Science.gov (United States)

    Soh, Ahmad Afiq Sabqi Awang; Jafri, Mohd Zubir Mat; Azraai, Nur Zaidi

    2015-04-01

    The Interest in this studies of human kinematics goes back very far in human history drove by curiosity or need for the understanding the complexity of human body motion. To find new and accurate information about the human movement as the advance computing technology became available for human movement that can perform. Martial arts (silat) were chose and multiple type of movement was studied. This project has done by using cutting-edge technology which is 3D motion capture to characterize and to measure the motion done by the performers of martial arts (silat). The camera will detect the markers (infrared reflection by the marker) around the performer body (total of 24 markers) and will show as dot in the computer software. The markers detected were analyzing using kinematic kinetic approach and time as reference. A graph of velocity, acceleration and position at time,t (seconds) of each marker was plot. Then from the information obtain, more parameters were determined such as work done, momentum, center of mass of a body using mathematical approach. This data can be used for development of the effectiveness movement in martial arts which is contributed to the people in arts. More future works can be implemented from this project such as analysis of a martial arts competition.

  17. Gesture Recognition from Data Streams of Human Motion Sensor Using Accelerated PSO Swarm Search Feature Selection Algorithm

    Directory of Open Access Journals (Sweden)

    Simon Fong

    2015-01-01

    Full Text Available Human motion sensing technology gains tremendous popularity nowadays with practical applications such as video surveillance for security, hand signing, and smart-home and gaming. These applications capture human motions in real-time from video sensors, the data patterns are nonstationary and ever changing. While the hardware technology of such motion sensing devices as well as their data collection process become relatively mature, the computational challenge lies in the real-time analysis of these live feeds. In this paper we argue that traditional data mining methods run short of accurately analyzing the human activity patterns from the sensor data stream. The shortcoming is due to the algorithmic design which is not adaptive to the dynamic changes in the dynamic gesture motions. The successor of these algorithms which is known as data stream mining is evaluated versus traditional data mining, through a case of gesture recognition over motion data by using Microsoft Kinect sensors. Three different subjects were asked to read three comic strips and to tell the stories in front of the sensor. The data stream contains coordinates of articulation points and various positions of the parts of the human body corresponding to the actions that the user performs. In particular, a novel technique of feature selection using swarm search and accelerated PSO is proposed for enabling fast preprocessing for inducing an improved classification model in real-time. Superior result is shown in the experiment that runs on this empirical data stream. The contribution of this paper is on a comparative study between using traditional and data stream mining algorithms and incorporation of the novel improved feature selection technique with a scenario where different gesture patterns are to be recognized from streaming sensor data.

  18. Spatially resolved streaming potentials of human intervertebral disk motion segments under dynamic axial compression.

    Science.gov (United States)

    Iatridis, James C; Furukawa, Masaru; Stokes, Ian A F; Gardner-Morse, Mack G; Laible, Jeffrey P

    2009-03-01

    Intervertebral disk degeneration results in alterations in the mechanical, chemical, and electrical properties of the disk tissue. The purpose of this study is to record spatially resolved streaming potential measurements across intervertebral disks exposed to cyclic compressive loading. We hypothesize that the streaming potential profile across the disk will vary with radial position and frequency and is proportional to applied load amplitude, according to the presumed fluid-solid relative velocity and measured glycosaminoglycan content. Needle electrodes were fabricated using a linear array of AgAgCl micro-electrodes and inserted into human motion segments in the midline from anterior to posterior. They were connected to an amplifier to measure electrode potentials relative to the saline bath ground. Motion segments were loaded in axial compression under a preload of 500 N, sinusoidal amplitudes of +/-200 N and +/-400 N, and frequencies of 0.01 Hz, 0.1 Hz, and 1 Hz. Streaming potential data were normalized by applied force amplitude, and also compared with paired experimental measurements of glycosaminoglycans in each disk. Normalized streaming potentials varied significantly with sagittal position and there was a significant location difference at the different frequencies. Normalized streaming potential was largest in the central nucleus region at frequencies of 0.1 Hz and 1.0 Hz with values of approximately 3.5 microVN. Under 0.01 Hz loading, normalized streaming potential was largest in the outer annulus regions with a maximum value of 3.0 microVN. Correlations between streaming potential and glycosaminoglycan content were significant, with R(2) ranging from 0.5 to 0.8. Phasic relationships between applied force and electrical potential did not differ significantly by disk region or frequency, although the largest phase angles were observed at the outermost electrodes. Normalized streaming potentials were associated with glycosaminoglycan content, fluid, and

  19. Biological Motion Preference in Humans at Birth: Role of Dynamic and Configural Properties

    Science.gov (United States)

    Bardi, Lara; Regolin, Lucia; Simion, Francesca

    2011-01-01

    The present study addresses the hypothesis that detection of biological motion is an intrinsic capacity of the visual system guided by a non-species-specific predisposition for the pattern of vertebrate movement and investigates the role of global vs. local information in biological motion detection. Two-day-old babies exposed to a biological…

  20. MR-based PET motion correction procedure for simultaneous MR-PET neuroimaging of human brain.

    Directory of Open Access Journals (Sweden)

    Marcus Görge Ullisch

    Full Text Available Positron Emission Tomography (PET images are prone to motion artefacts due to the long acquisition time of PET measurements. Recently, simultaneous magnetic resonance imaging (MRI and PET have become available in the first generation of Hybrid MR-PET scanners. In this work, the elimination of artefacts due to head motion in PET neuroimages is achieved by a new approach utilising MR-based motion tracking in combination with PET list mode data motion correction for simultaneous MR-PET acquisitions. The method comprises accurate MR-based motion measurements, an intra-frame motion minimising and reconstruction time reducing temporal framing algorithm, and a list mode based PET reconstruction which utilises the Ordinary Poisson Algorithm and avoids axial and transaxial compression. Compared to images uncorrected for motion, an increased image quality is shown in phantom as well as in vivo images. In vivo motion corrected images show an evident increase of contrast at the basal ganglia and a good visibility of uptake in tiny structures such as superior colliculi.

  1. 3D pose estimation and motion analysis of the articulated human hand-forearm limb in an industrial production environment

    Science.gov (United States)

    Hahn, Markus; Barrois, Björn; Krüger, Lars; Wöhler, Christian; Sagerer, Gerhard; Kummert, Franz

    2010-09-01

    This study introduces an approach to model-based 3D pose estimation and instantaneous motion analysis of the human hand-forearm limb in the application context of safe human-robot interaction. 3D pose estimation is performed using two approaches: The Multiocular Contracting Curve Density (MOCCD) algorithm is a top-down technique based on pixel statistics around a contour model projected into the images from several cameras. The Iterative Closest Point (ICP) algorithm is a bottom-up approach which uses a motion-attributed 3D point cloud to estimate the object pose. Due to their orthogonal properties, a fusion of these algorithms is shown to be favorable. The fusion is performed by a weighted combination of the extracted pose parameters in an iterative manner. The analysis of object motion is based on the pose estimation result and the motion-attributed 3D points belonging to the hand-forearm limb using an extended constraint-line approach which does not rely on any temporal filtering. A further refinement is obtained using the Shape Flow algorithm, a temporal extension of the MOCCD approach, which estimates the temporal pose derivative based on the current and the two preceding images, corresponding to temporal filtering with a short response time of two or at most three frames. Combining the results of the two motion estimation stages provides information about the instantaneous motion properties of the object. Experimental investigations are performed on real-world image sequences displaying several test persons performing different working actions typically occurring in an industrial production scenario. In all example scenes, the background is cluttered, and the test persons wear various kinds of clothes. For evaluation, independently obtained ground truth data are used. [Figure not available: see fulltext.

  2. 基于人体动作识别的服务机器人手臂运动控制%Service Robot Motion Control Based on Human Motion Recognition

    Institute of Scientific and Technical Information of China (English)

    王梅; 卢熙昌; 屠大维; 于远芳; 周华

    2015-01-01

    建立了一种基于人体动作识别的服务机器人控制系统,通过微软Kinect传感器对人体的关节动作和手势进行跟踪检测,获取人体手臂各关节角度和人的手掌状态,然后将手臂关节角以一定的映射准则映射到机器人各关节上,人的手掌状态对应机器人手爪的开合,最后将这些信息进行平滑滤波、编码处理,以无线局域网通信的方式传递给机器人,实现对服务机器人关节臂和手爪的控制。%A service robot control system based on human motion recognition is constructed in this paper.The angles hu-man arm joints and hand status are acquired by detecting and tracking human joints movement and gestures using Mi-crosoft Kinect sensor.Then establish the mapping rule between the joint angles status and robot joints,and hand status to robot paw status.Final y,after filtering and coding process,the information is transmitted to service robot by wireless networks to realize robot arm control.

  3. Ambulatory ST segment monitoring after myocardial infarction

    DEFF Research Database (Denmark)

    Mickley, H

    1994-01-01

    ischaemia provides prognostic information in different subsets of patients with previous myocardial infarction, but there is considerable disagreement about how this is expressed in terms of cardiac events. Small patient numbers, patient selection, and different timing of ambulatory monitoring are proposed...... as important reasons for the inconsistent findings. The precise role of ambulatory ST segment monitoring in clinical practice has yet to be established. Direct comparisons with exercise stress testing may not be appropriate for two reasons. Firstly, the main advantage of ambulatory monitoring may...... be that it can be performed early after infarction at the time of maximum risk. Secondly, it can be performed in most patients after infarction, including those recognised as being at high risk who are unable to perform an exercise stress test....

  4. Peritonitis Due to Roseomonas fauriae in a Patient Undergoing Continuous Ambulatory Peritoneal Dialysis

    OpenAIRE

    Bibashi, Evangelia; Sofianou, Danai; Kontopoulou, Konstantina; Mitsopoulos, Efstathios; Kokolina, Elisabeth

    2000-01-01

    Roseomonas is a newly described genus of pink-pigmented, nonfermentative, gram-negative bacteria that have been recognized as a cause of human infections. Roseomonas fauriae is a species rarely isolated from clinical specimens. We report the first known case of peritonitis caused by R. fauriae in a patient receiving continuous ambulatory peritoneal dialysis.

  5. Peritonitis due to Roseomonas fauriae in a patient undergoing continuous ambulatory peritoneal dialysis.

    Science.gov (United States)

    Bibashi, E; Sofianou, D; Kontopoulou, K; Mitsopoulos, E; Kokolina, E

    2000-01-01

    Roseomonas is a newly described genus of pink-pigmented, nonfermentative, gram-negative bacteria that have been recognized as a cause of human infections. Roseomonas fauriae is a species rarely isolated from clinical specimens. We report the first known case of peritonitis caused by R. fauriae in a patient receiving continuous ambulatory peritoneal dialysis.

  6. Model-Based Description of Human Body Motions for Ergonomics Evaluation

    Science.gov (United States)

    Imai, Sayaka

    This paper presents modeling of Working Process and Working Simulation factory works. I focus on an example work (motion), its actual work(motion) and reference between them. An example work and its actual work can be analyzed and described as a sequence of atomic action. In order to describe workers' motion, some concepts of Atomic Unit, Model Events and Mediator are introduced. By using these concepts, we can analyze a workers' action and evaluate their works. Also, we consider it as a possible way for unifying all the data used in various applications (CAD/CAM, etc) during the design process and evaluating all subsystems in a virtual Factory.

  7. Human motion characteristics in relation to feeling familiar or frightened during an announced short interaction with a proactive humanoid.

    Science.gov (United States)

    Baddoura, Ritta; Venture, Gentiane

    2014-01-01

    During an unannounced encounter between two humans and a proactive humanoid (NAO, Aldebaran Robotics), we study the dependencies between the human partners' affective experience (measured via the answers to a questionnaire) particularly regarding feeling familiar and feeling frightened, and their arm and head motion [frequency and smoothness using Inertial Measurement Units (IMU)]. NAO starts and ends its interaction with its partners by non-verbally greeting them hello (bowing) and goodbye (moving its arm). The robot is invested with a real and useful task to perform: handing each participant an envelope containing a questionnaire they need to answer. NAO's behavior varies from one partner to the other (Smooth with X vs. Resisting with Y). The results show high positive correlations between feeling familiar while interacting with the robot and: the frequency and smoothness of the human arm movement when waving back goodbye, as well as the smoothness of the head during the whole encounter. Results also show a negative dependency between feeling frightened and the frequency of the human arm movement when waving back goodbye. The principal component analysis (PCA) suggests that, in regards to the various motion measures examined in this paper, the head smoothness and the goodbye gesture frequency are the most reliable measures when it comes to considering the familiar experienced by the participants. The PCA also points out the irrelevance of the goodbye motion frequency when investigating the participants' experience of fear in its relation to their motion characteristics. The results are discussed in light of the major findings of studies on body movements and postures accompanying specific emotions.

  8. Human motion characteristics in relation to feeling familiar or frightened during an announced short interaction with a proactive humanoid

    Directory of Open Access Journals (Sweden)

    Ritta eBaddoura

    2014-03-01

    Full Text Available During an unannounced encounter between two humans and a proactive humanoid (called NAO, we study the dependencies between the human partners’ affective experience (measured via the answers to a questionnaire particularly regarding feeling familiar and feeling frightened, and their arm and head motion (frequency and smoothness using Inertial Measurement Units (IMU. NAO starts and ends its interaction with its partners by non-verbally greeting them hello (bowing and goodbye (moving its arm. The robot is invested with a real and useful task to perform: handing each participant an envelope containing a questionnaire they need to answer. NAO’s behavior varies from one partner to the other (Smooth with X vs. Resisting with Y. The results show high positive correlations between feeling familiar while interacting with the robot and: the frequency and smoothness of the human arm movement when waving back goodbye, as well as the smoothness of the head during the whole encounter. Results also show a strong negative dependency between feeling frightened and the frequency of the human arm movement when waving back goodbye. The Principal Component Analysis (PCA suggests that, in regards to the various motion measures examined in this paper, the head smoothness and the goodbye gesture frequency are the most reliable measures when it comes to considering the familiar experienced by the participants. The PCA also points out the irrelevance of the goodbye motion frequency when investigating the participants’ experience of fear in its relation to their motion characteristics. The results are discussed in light of the major findings of studies on body movements and postures accompanying specific emotions.

  9. EEG frequency tagging dissociates between neural processing of motion synchrony and human quality of multiple point-light dancers

    Science.gov (United States)

    Alp, Nihan; Nikolaev, Andrey R.; Wagemans, Johan; Kogo, Naoki

    2017-01-01

    Do we perceive a group of dancers moving in synchrony differently from a group of drones flying in-sync? The brain has dedicated networks for perception of coherent motion and interacting human bodies. However, it is unclear to what extent the underlying neural mechanisms overlap. Here we delineate these mechanisms by independently manipulating the degree of motion synchrony and the humanoid quality of multiple point-light displays (PLDs). Four PLDs moving within a group were changing contrast in cycles of fixed frequencies, which permits the identification of the neural processes that are tagged by these frequencies. In the frequency spectrum of the steady-state EEG we found two emergent frequency components, which signified distinct levels of interactions between PLDs. The first component was associated with motion synchrony, the second with the human quality of the moving items. These findings indicate that visual processing of synchronously moving dancers involves two distinct neural mechanisms: one for the perception of a group of items moving in synchrony and one for the perception of a group of moving items with human quality. We propose that these mechanisms underlie high-level perception of social interactions. PMID:28272421

  10. Clinical Assessment Applications of Ambulatory Biosensors

    Science.gov (United States)

    Haynes, Stephen N.; Yoshioka, Dawn T.

    2007-01-01

    Ambulatory biosensor assessment includes a diverse set of rapidly developing and increasingly technologically sophisticated strategies to acquire minimally disruptive measures of physiological and motor variables of persons in their natural environments. Numerous studies have measured cardiovascular variables, physical activity, and biochemicals…

  11. Ambulatory Care Skills: Do Residents Feel Prepared?

    Directory of Open Access Journals (Sweden)

    Denise Bonds

    2002-10-01

    Full Text Available Objective: To determine resident comfort and skill in performing ambulatory care skills. Methods: Descriptive survey of common ambulatory care skills administered to internal medicine faculty and residents at one academic medical center. Respondents were asked to rate their ability to perform 12 physical exam skills and 6 procedures, and their comfort in performing 7 types of counseling, and obtaining 6 types of patient history (4 point Likert scale for each. Self-rated ability or comfort was compared by gender, status (year of residency, faculty, and future predicted frequency of use of the skill. Results: Residents reported high ability levels for physical exam skills common to both the ambulatory and hospital setting. Fewer felt able to perform musculoskeletal, neurologic or eye exams easily alone. Procedures generally received low ability ratings. Similarly, residents’ comfort in performing common outpatient counseling was also low. More residents reported feeling very comfortable in obtaining history from patients. We found little variation by gender, year of training, or predicted frequency of use. Conclusion: Self-reported ability and comfort for many common ambulatory care skills is low. Further evaluation of this finding in other training programs is warranted.

  12. Planning an ambulatory care joint venture.

    Science.gov (United States)

    Harpster, L M

    1988-01-01

    This article discusses ambulatory care joint ventures by hospitals and selected members of their medical staffs and emphasizes the resolution of problems in the early planning stages. Failure to follow an orderly and thoughtful planning process not only risks valuable resources of the venture partners, but also jeopardizes the working relationship between the hospital and its medical staff.

  13. Regional anesthesia techniques for ambulatory orthopedic surgery.

    LENUS (Irish Health Repository)

    O'Donnell, Brian D

    2012-02-03

    PURPOSE OF REVIEW: The purpose of this review is to present advances in the use of regional anesthetic techniques in ambulatory orthopedic surgery. New findings regarding the use of both neuraxial anesthesia and peripheral nerve block are discussed. RECENT FINDINGS: Neuraxial anesthesia: The use of short-acting local anesthetic agents such as mepivacaine, 2-chloroprocaine, and articaine permits rapid onset intrathecal anesthesia with early recovery profiles. Advantages and limitations of these agents are discussed.Peripheral nerve block: Peripheral nerve blocks in limb surgery have the potential to transform this patient cohort into a truly ambulatory, self-caring group. Recent trends and evidence regarding the benefits of regional anesthesia techniques are presented.Continuous perineural catheters permit extension of improved perioperative analgesia into the ambulatory home setting. The role and reported safety of continuous catheters are discussed. SUMMARY: In summary, shorter acting, neuraxial, local anesthetic agents, specific to the expected duration of surgery, may provide superior recovery profiles in the ambulatory setting. A trend towards more peripheral and selective nerve blocks exists. The infrapatellar block is a promising technique to provide analgesia following knee arthroscopy. Improved analgesia seen in the perioperative period can be safely and effectively extended to the postoperative period with the use of perineural catheters.

  14. Predicting recovery at home after Ambulatory Surgery

    Directory of Open Access Journals (Sweden)

    Ayala Guillermo

    2011-10-01

    Full Text Available Abstract The correct implementation of Ambulatory Surgery must be accompanied by an accurate monitoring of the patient post-discharge state. We fit different statistical models to predict the first hours postoperative status of a discharged patient. We will also be able to predict, for any discharged patient, the probability of needing a closer follow-up, or of having a normal progress at home. Background The status of a discharged patient is predicted during the first 48 hours after discharge by using variables routinely used in Ambulatory Surgery. The models fitted will provide the physician with an insight into the post-discharge progress. These models will provide valuable information to assist in educating the patient and their carers about what to expect after discharge as well as to improve their overall level of satisfaction. Methods A total of 922 patients from the Ambulatory Surgery Unit of the Dr. Peset University Hospital (Valencia, Spain were selected for this study. Their post-discharge status was evaluated through a phone questionnaire. We pretend to predict four variables which were self-reported via phone interviews with the discharged patient: sleep, pain, oral tolerance of fluid/food and bleeding status. A fifth variable called phone score will be built as the sum of these four ordinal variables. The number of phone interviews varies between patients, depending on the evolution. The proportional odds model was used. The predictors were age, sex, ASA status, surgical time, discharge time, type of anaesthesia, surgical specialty and ambulatory surgical incapacity (ASI. This last variable reflects, before the operation, the state of incapacity and severity of symptoms in the discharged patient. Results Age, ambulatory surgical incapacity and the surgical specialty are significant to explain the level of pain at the first call. For the first two phone calls, ambulatory surgical incapacity is significant as a predictor for all

  15. Touching motion: rTMS on the human middle temporal complex interferes with tactile speed perception.

    Science.gov (United States)

    Basso, Demis; Pavan, Andrea; Ricciardi, Emiliano; Fagioli, Sabrina; Vecchi, Tomaso; Miniussi, Carlo; Pietrini, Pietro

    2012-10-01

    Brain functional and psychophysical studies have clearly demonstrated that visual motion perception relies on the activity of the middle temporal complex (hMT+). However, recent studies have shown that hMT+ seems to be also activated during tactile motion perception, suggesting that this visual extrastriate area is involved in the processing and integration of motion, irrespective of the sensorial modality. In the present study, we used repetitive transcranial magnetic stimulation (rTMS) to assess whether hMT+ plays a causal role in tactile motion processing. Blindfolded participants detected changes in the speed of a grid of tactile moving points with their finger (i.e. tactile modality). The experiment included three different conditions: a control condition with no TMS and two TMS conditions, i.e. hMT+-rTMS and posterior parietal cortex (PPC)-rTMS. Accuracies were significantly impaired during hMT+-rTMS but not in the other two conditions (No-rTMS or PPC-rTMS), moreover, thresholds for detecting speed changes were significantly higher in the hMT+-rTMS with respect to the control TMS conditions. These findings provide stronger evidence that the activity of the hMT+ area is involved in tactile speed processing, which may be consistent with the hypothesis of a supramodal role for that cortical region in motion processing.

  16. The Influences of Arm Resist Motion on a CAR Crash Test Using Hybrid III Dummy with Human-Like Arm

    Science.gov (United States)

    Kim, Yongchul; Youm, Youngil; Bae, Hanil; Choi, Hyeonki

    Safety of the occupant during the crash is very essential design element. Many researches have been investigated in reducing the fatal injury of occupant. They are focusing on the development of a dummy in order to obtain the real human-like motion. However, they have not considered the arm resist motion during the car accident. In this study, we would like to suggest the importance of the reactive force of the arm in a car crash. The influences of reactive force acting on the human upper extremity were investigated using the impedance experimental method with lumped mass model of hand system and a Hybrid III dummy with human-like arm. Impedance parameters (e.g. inertia, spring constant and damping coefficient) of the elbow joint in maximum activation level were measured by free oscillation test using single axis robot. The results showed that without seat belt, the reactive force of human arm reduced the head, chest, and femur injury, and the flexion moment of the neck is higher than that of the conventional dummy.

  17. Human body motion tracking based on quantum-inspired immune cloning algorithm

    Science.gov (United States)

    Han, Hong; Yue, Lichuan; Jiao, Licheng; Wu, Xing

    2009-10-01

    In a static monocular camera system, to gain a perfect 3D human body posture is a great challenge for Computer Vision technology now. This paper presented human postures recognition from video sequences using the Quantum-Inspired Immune Cloning Algorithm (QICA). The algorithm included three parts. Firstly, prior knowledge of human beings was used, the key joint points of human could be detected automatically from the human contours and skeletons which could be thinning from the contours; And due to the complexity of human movement, a forecasting mechanism of occlusion joint points was addressed to get optimum 2D key joint points of human body; And then pose estimation recovered by optimizing between the 2D projection of 3D human key joint points and 2D detection key joint points using QICA, which recovered the movement of human body perfectly, because this algorithm could acquire not only the global optimal solution, but the local optimal solution.

  18. A single theoretical framework for circular features processing in humans: orientation and direction of motion compared

    Directory of Open Access Journals (Sweden)

    Tzvetomir eTzvetanov

    2012-05-01

    Full Text Available Common computational principles underly processing of various visual features in the cortex. They are considered to create similar patterns of contextual modulations in behavioral studies for different features as orientation and direction of motion. Here, I studied the possibility that a single theoretical framework, implemented in different visual areas, of circular feature coding and processing could explain these similarities in observations. Stimuli were created that allowed direct comparison of the contextual effects on orientation and motion direction with two different psychophysical probes: changes in weak and strong signal perception. One unique simplified theoretical model of circular feature coding including only inhibitory interactions, and decoding through standard vector average, successfully predicted the similarities in the two domains, while different feature population characteristics explained well the differences in modulation on both experimental probes. These results demonstrate how a single computational principle underlies processing of various features across the cortices.

  19. Advances in ambulatory monitoring: regulatory considerations.

    Science.gov (United States)

    Buckles, David; Aguel, Felipe; Brockman, Randall; Cheng, James; Demian, Cindy; Ho, Charles; Jensen, Donald; Mallis, Elias

    2004-01-01

    Conventional ambulatory electrocardiogram (ECG) (Holter) monitoring involves 2 or 3 surface leads recorded with electrode positions and signal characteristics that are different from diagnostic quality 12-lead ECGs due to the limitations imposed by technology on the ambulatory recorders. The rapid pace of technological development for medical devices, particularly electrocardiography, has now enabled the recording of diagnostic quality 12-lead ECG waveforms for extended time periods. This capability allows Holter recording to become another source for diagnostic 12-lead ECG records on a par with other modalities such as resting ECG and exercise stress testing. Additionally, other diagnostic techniques such as S-T segment analysis and Q-T interval analysis that rely on diagnostic quality waveforms can now be applied. All of these enhancements to the traditional Holter modality have altered the regulatory perspective of these devices, since the enhancements may represent a new intended use for the device.

  20. Cochlear implant in an ambulatory surgery center.

    Science.gov (United States)

    Joseph, Aimee M; Lassen, L Frederick

    2013-02-01

    Presbycusis, or sensorineural hearing loss in the elderly population, affects approximately 40% to 50% of people over the age of 75. A variety of devices are available to those with hearing loss. Cochlear implants, for example, are especially useful for those with severe-to-profound hearing loss. The population is aging, so the demand for cochlear implantation in ambulatory surgery centers will likely increase. Ambulatory surgery centers (ASC) can provide a more convenient and less expensive location for cochlear implant surgery than hospital-based operating facilities. Patient selection using standard ASC criteria, coupled with an understanding of the unique surgical and anesthetic needs of cochlear implant patients, are key to bringing this once exotic inpatient procedure into the ASC.

  1. Anticoagulation management in the ambulatory surgical setting.

    Science.gov (United States)

    Eisenstein, Diana Hill

    2012-04-01

    Many people receiving maintenance anticoagulation therapy require surgery each year in ambulatory surgery centers. National safety organizations focus attention toward improving anticoagulation management, and the American College of Chest Physicians has established guidelines for appropriate anticoagulation management to balance the risk of thromboembolism when warfarin is discontinued with the risk of bleeding when anticoagulation therapy is maintained. The guidelines recommend that patients at high or moderate risk for thromboembolism should be bridged with subcutaneous low-molecular-weight heparin or IV unfractionated heparin with the interruption of warfarin, and low-risk patients may require subcutaneous low-molecular-weight heparin or no bridging with the interruption of warfarin. The guidelines recommend the continuation of warfarin for patients who are undergoing minor dermatologic or dental procedures or cataract removal. The literature reveals, however, that there is not adequate adherence to these recommendations and guidelines. Management of anticoagulation therapy by a nurse practitioner may improve compliance and safety in ambulatory surgery centers.

  2. A Topographical Analysis of the Human Electroencephalogram for Patterns in the Development of Motion Sickness

    Science.gov (United States)

    1991-12-01

    itude Estimation Method," Aviaion: Space rind F~nv rntal Medcine : 43W: 773-777 (August 1982). 4. Booker, Harold E. "taJ. "Effects of Diphenylhydantoin...1988). 12. Dhenin, G. "Motion Sickness," Aviation Medicine, Chapter 22. London: Tri- Med Books Limited, 1978. 72 13. Dreifus, F. E.. "A Classification...James F. Jr. and Vita R. West. Bioastronautics Data Book . Washington D.C.: National Aeronautics and Space Administration, 1973. 48. Rail, Theodore W. and

  3. Ambulatory Assessment of Depression in Primary Care

    Science.gov (United States)

    2016-06-29

    Statement The auth~r hereby certifies that the use of any copyrighted material in the thesis manuscript entitled: "AMBULATORY ASSESSMENT OF DEPRESSION IN...Department Medical and Clinical Psychology Uniformed Services University of the Health Sciences 11 iii Abstract Depression is common among individuals in...primary care. Despite the prevalence of depression in primary care, patients are usually not adequately treated for depression . Often the treatment

  4. Ambulatory Blood Pressure Monitoring in the Elderly

    OpenAIRE

    Juan Diego Mediavilla García; Fernando Jaén Águila; Celia Fernández Torres; Blas Gil Extremera; Juan Jiménez Alonso

    2012-01-01

    The incidence of hypertension is high in the elderly and is present in 2/3 of the patients older than 65 years. Prevalence can reach 90% in patients older than 80 years. The presence of isolated systolic hypertension (ISH) is characteristic of this population. However, the prevalence of hypertension by ambulatory blood pressure monitoring (ABPM) is not well known. In this study, we analyzed the special characteristics of hypertension in this population, giving special emphasis on ABPM readings.

  5. The evolution of ambulatory ECG monitoring.

    Science.gov (United States)

    Kennedy, Harold L

    2013-01-01

    Ambulatory Holter electrocardiographic (ECG) monitoring has undergone continuous technological evolution since its invention and development in the 1950s era. With commercial introduction in 1963, there has been an evolution of Holter recorders from 1 channel to 12 channel recorders with increasingly smaller storage media, and there has evolved Holter analysis systems employing increasingly technologically advanced electronics providing a myriad of data displays. This evolution of smaller physical instruments with increasing technological capacity has characterized the development of electronics over the past 50 years. Currently the technology has been focused upon the conventional continuous 24 to 48 hour ambulatory ECG examination, and conventional extended ambulatory monitoring strategies for infrequent to rare arrhythmic events. However, the emergence of the Internet, Wi-Fi, cellular networks, and broad-band transmission has positioned these modalities at the doorway of the digital world. This has led to an adoption of more cost-effective strategies to these conventional methods of performing the examination. As a result, the emergence of the mobile smartphone coupled with this digital capacity is leading to the recent development of Holter smartphone applications. The potential of point-of-care applications utilizing the Holter smartphone and a vast array of new non-invasive sensors is evident in the not too distant future. The Holter smartphone is anticipated to contribute significantly in the future to the field of global health.

  6. Effective analgesic modalities for ambulatory patients.

    Science.gov (United States)

    Redmond, Martin; Florence, Barry; Glass, Peter S A

    2003-06-01

    The introduction of government-mandated standards for pain management has focused our attention on postoperative pain. With the recent JACHO standards' for ambulatory surgery, it is imperative that all health care workers who care for these patients are familiar with appropriate pain management. Developments in our understanding of the pathophysiology of acute pain have further enhanced our ability to improve pain management for postoperative ambulatory patients. This has led to the concept of preventive analgesia (inhibition of physiological and pathological secondary inflammatory pain). Extensive work has shown that this is best achieved using a multimodel approach usually consisting of an NSAID, opioid, and local anesthetic. NMDA antagonists (ketamine, dextromethorphan) and alpha-2 agnoists (clonodine) show potential supplements to further enhance pain management, especially if given preemptively. Nonpharmacological intervention such as cold therapy or acupuncture may also be considered. The armanentarium for effective pain management has improved substantially over the past few years. The challenge is for health care workers to implement these therapies to obtain optimum pain management in ambulatory surgical patients.

  7. Ambulatory Blood Pressure Monitoring in Clinical Practice: A Review

    OpenAIRE

    Turner, J. Rick; Viera, Anthony J.; Shimbo, Daichi

    2014-01-01

    Ambulatory blood pressure monitoring offers the ability to collect blood pressure readings several times an hour across a 24-hour period. Ambulatory blood pressure monitoring facilitates the identification of white-coat hypertension, the phenomenon whereby certain individuals who are not on antihypertensive medication show elevated blood pressure in a clinical setting but show non-elevated blood pressure averages when assessed by ambulatory blood pressure monitoring. Additionally, readings ca...

  8. Ambulatory anesthesia: optimal perioperative management of the diabetic patient

    OpenAIRE

    Polderman JAW; van Wilpe R; Eshuis JH; Preckel B; Hermanides J

    2016-01-01

    Jorinde AW Polderman, Robert van Wilpe, Jan H Eshuis, Benedikt Preckel, Jeroen Hermanides Department of Anaesthesiology, Academic Medical Centre, University of Amsterdam, Amsterdam, the Netherlands Abstract: Given the growing number of patients with diabetes mellitus (DM) and the growing number of surgical procedures performed in an ambulatory setting, DM is one of the most encountered comorbidities in patients undergoing ambulatory surgery. Perioperative management of ambulatory patients wi...

  9. Acupuncture in ambulatory anesthesia: a review

    Directory of Open Access Journals (Sweden)

    Norheim AJ

    2015-09-01

    Full Text Available Arne Johan Norheim,1 Ingrid Liodden,1 Terje Alræk1,2 1National Research Center in Complementary and Alternative Medicine (NAFKAM, Department of Community Medicine, Faculty of Health Sciences, University of Tromsø – The Arctic University of Norway, Tromsø, 2The Norwegian School of Health Sciences, Institute of Acupuncture, Kristiania University College, Oslo, NorwayBackground: Post-anesthetic morbidities remain challenging in our daily practice of anesthesia. Meta-analyses and reviews of acupuncture and related techniques for postoperative nausea and vomiting (POVN and postoperative vomiting (POV show promising results while many clinicians remain skeptical of the value of acupuncture. Given the interest in finding safe non-pharmacological approaches toward postoperative care, this body of knowledge needs to be considered. This review critically appraises and summarizes the research on acupuncture and acupressure in ambulatory anesthesia during the last 15 years.Methods: Articles were identified through searches of Medline, PubMed, and Embase using the search terms “acupuncture” or “acupuncture therapy” in combination with “ambulatory anesthesia” or “ambulatory surgery” or “day surgery” or “postoperative”. A corresponding search was done using “acupressure” and “wristbands”. The searches generated a total of 104, 118, and 122 references, respectively.Results: Sixteen studies were included; eight studies reported on acupuncture and eight on acupressure. Nine studies found acupuncture or acupressure effective on primary endpoints including postoperative nausea and vomiting, postoperative pain, sore throat, and emergence agitation. Four studies found acupuncture had a similar effect to antiemetic medication.Conclusion: Overall, the studies were of fairly good quality. A large proportion of the reviewed papers highlights an effect of acupuncture or acupressure on postoperative morbidities in an ambulatory setting

  10. Ambulatory anesthesia: optimal perioperative management of the diabetic patient

    Directory of Open Access Journals (Sweden)

    Polderman JAW

    2016-05-01

    Full Text Available Jorinde AW Polderman, Robert van Wilpe, Jan H Eshuis, Benedikt Preckel, Jeroen Hermanides Department of Anaesthesiology, Academic Medical Centre, University of Amsterdam, Amsterdam, the Netherlands Abstract: Given the growing number of patients with diabetes mellitus (DM and the growing number of surgical procedures performed in an ambulatory setting, DM is one of the most encountered comorbidities in patients undergoing ambulatory surgery. Perioperative management of ambulatory patients with DM requires a different approach than patients undergoing major surgery, as procedures are shorter and the stress response caused by surgery is minimal. However, DM is a risk factor for postoperative complications in ambulatory surgery, so should be managed carefully. Given the limited time ambulatory patients spend in the hospital, improvement in management has to be gained from the preanesthetic assessment. The purpose of this review is to summarize current literature regarding the anesthesiologic management of patients with DM in the ambulatory setting. We will discuss the risks of perioperative hyperglycemia together with the pre-, intra-, and postoperative considerations for these patients when encountered in an ambulatory setting. Furthermore, we provide recommendations for the optimal perioperative management of the diabetic patient undergoing ambulatory surgery. Keywords: diabetes mellitus, perioperative period, ambulatory surgery, insulin, complications, GLP-1 agonist, DPP-4 inhibitor

  11. A general-purpose framework to simulate musculoskeletal system of human body: using a motion tracking approach.

    Science.gov (United States)

    Ehsani, Hossein; Rostami, Mostafa; Gudarzi, Mohammad

    2016-02-01

    Computation of muscle force patterns that produce specified movements of muscle-actuated dynamic models is an important and challenging problem. This problem is an undetermined one, and then a proper optimization is required to calculate muscle forces. The purpose of this paper is to develop a general model for calculating all muscle activation and force patterns in an arbitrary human body movement. For this aim, the equations of a multibody system forward dynamics, which is considered for skeletal system of the human body model, is derived using Lagrange-Euler formulation. Next, muscle contraction dynamics is added to this model and forward dynamics of an arbitrary musculoskeletal system is obtained. For optimization purpose, the obtained model is used in computed muscle control algorithm, and a closed-loop system for tracking desired motions is derived. Finally, a popular sport exercise, biceps curl, is simulated by using this algorithm and the validity of the obtained results is evaluated via EMG signals.

  12. Time and motion, experiment M151. [human performance and space flight stress

    Science.gov (United States)

    Kubis, J. F.; Elrod, J. T.; Rusnak, R.; Mcbride, G. H.; Barnes, J. E.; Saxon, S. C.

    1973-01-01

    Astronaut work performance during the preparation and execution of experiments in simulated Skylab tests was analyzed according to time and motion in order to evaluate the efficiency and consistency of performance (adaptation function) for several different types of activity over the course of the mission; to evaluate the procedures to be used by the same experiment in Skylab; to generate characteristic adaptation functions for later comparison with Skylab data; and to examine astronaut performance for any behavioral stress due to the environment. The overall results indicate that the anticipated adaptation function was obtained both for individual and for averaged data.

  13. Lubricin in human achilles tendon: The evidence of intratendinous sliding motion and shear force in achilles tendon.

    Science.gov (United States)

    Sun, Yu-Long; Wei, Zhuang; Zhao, Chunfeng; Jay, Gregory D; Schmid, Thomas M; Amadio, Peter C; An, Kai-Nan

    2015-06-01

    Achilles tendon is one of the most commonly injured tendons. Mechanical force is regarded as a major causative factor. However, the biomechanics of Achilles tendon and mechanical mechanism of the injuries are unclear. Lubricin expresses at regions exposed to sliding motion and shear force in a number of tissues. This study investigated the distribution and concentration of lubricin in human Achilles tendons for better understanding the biomechanics of Achilles tendon. Achilles tendons were harvested from nine cadavers. Lubricin was extracted from various locations proximal to the calcaneal insertion and quantified with ELISA. The distribution of lubricin was investigated with immunohistochemistry. Lubricin was mainly identified at the interfaces of tendon fascicles, especially in the mid-portion of the tendon. The concentration of lubricin in Achilles tendons varied by individual and the distance from its calcaneal insertion. The distal portion of the tendon had a higher concentration of lubricin than the proximal regions of the tendon. This study suggests the presence of intratendinous sliding motion of fascicles and shear force at interfaces of fascicles in human Achilles tendon. Shear force could be an important mechanical factor for the development of Achilles tendinopathy and rupture.

  14. Experimental investigation of vitreous humour motion within a human eye model

    Energy Technology Data Exchange (ETDEWEB)

    Repetto, Rodolfo [Dipartimento di Ingegneria delle Strutture, delle Acque e del Terreno, University of L' Aquila (Italy); Stocchino, Alessandro [Dipartimento di Ingegneria Ambientale, University of Genova (Italy); Cafferata, Chiara [Dipartimento di Ingegneria Ambientale, University of Genova (Italy)

    2005-10-07

    We present an experimental study of the vitreous motion induced by saccadic eye movements. A magnified model of the vitreous chamber has been employed, consisting of a spherical cavity carved in a perspex cylindrical container, which is able to rotate with a prescribed time law. Care has been taken to correctly reproduce real saccadic eye movements. The spherical cavity is filled with glycerol and the flow field is measured on the equatorial plane orthogonal to the axis of rotation, through the PIV technique. Visualizations of the fully three-dimensional flow suggest that it essentially occurs on planes perpendicular to the axis of rotation, the motion orthogonal to such planes being smaller by three to four orders of magnitude. Theoretical results, based on a simplified solution, are in very good agreement with the experimental findings. The maximum value of the shear stress at the wall, which is thought to play a possibly important role in the pathogenesis of retinal detachment, does not significantly depend on the amplitude of saccadic movements. This suggests that relatively small eye rotations, being much more frequent than large movements, are mainly responsible for vitreous stresses on the retina. Results also illustrate the dependence of the maximum shear stress at the wall from the vitreous viscosity.

  15. A Study of the Characteristics of Human-Pilot Control Response to Simulated Aircraft Lateral Motions

    Science.gov (United States)

    Cheatham, Donald C

    1954-01-01

    Report presents the results of studies made in an attempt to provide information on the control operations of the human pilot. These studies included an investigation of the ability of pilots to control simulated unstable yawing oscillations, a study of the basic characteristics of human-pilot control response, and a study to determine whether and to what extent pilot control response can be represented in an analytical form.

  16. Renal disease in pregnancy ambulatory issues.

    Science.gov (United States)

    Phelan, Sharon T

    2012-09-01

    Acute and chronic renal disease will complicate prenatal care. Normal physiological changes during pregnancy make the urinary tract system more vulnerable to infectious complications or worsening of preexisting disease. Much of the focus of prenatal care includes screening for these concerns both at the onset of prenatal care and through the pregnancy and postpartum course. With careful and attentive care, the pregnancy outcome for women with significant renal disease has improved and the occurrence of renal injury or obstetric complications due to infectious insults has decreased. This manuscript reviews the current ambulatory prenatal care as it relates to the urinary tract in pregnancy.

  17. [Hospitalisations for ambulatory care sensitive conditions in Germany

    NARCIS (Netherlands)

    Freund, T.; Heller, G.; Szecsenyi, J.

    2014-01-01

    BACKGROUND: On the basis of the assumption that a significant proportion of hospitalisations for so-called ambulatory care sensitive conditions (ACSCs) are potentially avoidable by ambulatory care measures, hospitalisation rates for ACSCs are used internationally as population based indicators for a

  18. An Ambulatory Program for Surgical Residents and Medical Students.

    Science.gov (United States)

    Levy, Margaret

    1988-01-01

    A pilot program based in a freestanding ambulatory surgery center at the Chicago Medical School Department of Surgery is described, its curriculum outlined, and the daily activities of the residents and medical students are detailed. A brief history of ambulatory surgery is given. (Author/MLW)

  19. Reliability of functional and predictive methods to estimate the hip joint centre in human motion analysis in healthy adults.

    Science.gov (United States)

    Kainz, Hans; Hajek, Martin; Modenese, Luca; Saxby, David J; Lloyd, David G; Carty, Christopher P

    2017-03-01

    In human motion analysis predictive or functional methods are used to estimate the location of the hip joint centre (HJC). It has been shown that the Harrington regression equations (HRE) and geometric sphere fit (GSF) method are the most accurate predictive and functional methods, respectively. To date, the comparative reliability of both approaches has not been assessed. The aims of this study were to (1) compare the reliability of the HRE and the GSF methods, (2) analyse the impact of the number of thigh markers used in the GSF method on the reliability, (3) evaluate how alterations to the movements that comprise the functional trials impact HJC estimations using the GSF method, and (4) assess the influence of the initial guess in the GSF method on the HJC estimation. Fourteen healthy adults were tested on two occasions using a three-dimensional motion capturing system. Skin surface marker positions were acquired while participants performed quite stance, perturbed and non-perturbed functional trials, and walking trials. Results showed that the HRE were more reliable in locating the HJC than the GSF method. However, comparison of inter-session hip kinematics during gait did not show any significant difference between the approaches. Different initial guesses in the GSF method did not result in significant differences in the final HJC location. The GSF method was sensitive to the functional trial performance and therefore it is important to standardize the functional trial performance to ensure a repeatable estimate of the HJC when using the GSF method.

  20. Superior results with continuous passive motion compared to active motion after periosteal transplantation. A retrospective study of human patella cartilage defect treatment.

    Science.gov (United States)

    Alfredson, H; Lorentzon, R

    1999-01-01

    Fifty-seven consecutive patients (33 men and 24 women), with a mean age of 32 years (range 16-53 years), who suffered from an isolated full-thickness cartilage defect of the patella and disabling knee pain of long duration, were treated by autologous periosteal transplantation to the cartilage defect. The first 38 consecutive patients (group A) were postoperatively treated with continuous passive motion (CPM), and the next 19 consecutive patients (group B) were treated with active motion for the first 5 days postoperatively. In both groups, the initial regimens were followed by active motion, slowly progressive strength training, and slowly progressive weight bearing. In group A, after a mean follow-up of 51 months (range 33-92 months), 29 patients (76%) were graded as excellent or good, 7 patients (19%) were graded as fair, and 2 patients (5%) were graded as poor. In group B, after a mean follow-up of 21 months (range 14-28 months), 10 patients (53%) were graded as excellent or good, 6 patients (32%) were graded as fair, and 3 patients (15%) were graded as poor. Altogether, nine of the fair or poor cases (50%) were diagnosed with chondromalacia of the patella. Our results, after performing autologous periosteal transplantation in patients with full-thickness cartilage defects of the patella and disabling knee pain, are good if CPM is used postoperatively. The clinical results using active motion postoperatively are not acceptable, especially not in patients with chondromalacia of the patella.

  1. Dopamine Activation Preserves Visual Motion Perception Despite Noise Interference of Human V5/MT

    Science.gov (United States)

    Yousif, Nada; Fu, Richard Z.; Abou-El-Ela Bourquin, Bilal; Bhrugubanda, Vamsee; Schultz, Simon R.

    2016-01-01

    When processing sensory signals, the brain must account for noise, both noise in the stimulus and that arising from within its own neuronal circuitry. Dopamine receptor activation is known to enhance both visual cortical signal-to-noise-ratio (SNR) and visual perceptual performance; however, it is unknown whether these two dopamine-mediated phenomena are linked. To assess this, we used single-pulse transcranial magnetic stimulation (TMS) applied to visual cortical area V5/MT to reduce the SNR focally and thus disrupt visual motion discrimination performance to visual targets located in the same retinotopic space. The hypothesis that dopamine receptor activation enhances perceptual performance by improving cortical SNR predicts that dopamine activation should antagonize TMS disruption of visual perception. We assessed this hypothesis via a double-blinded, placebo-controlled study with the dopamine receptor agonists cabergoline (a D2 agonist) and pergolide (a D1/D2 agonist) administered in separate sessions (separated by 2 weeks) in 12 healthy volunteers in a William's balance-order design. TMS degraded visual motion perception when the evoked phosphene and the visual stimulus overlapped in time and space in the placebo and cabergoline conditions, but not in the pergolide condition. This suggests that dopamine D1 or combined D1 and D2 receptor activation enhances cortical SNR to boost perceptual performance. That local visual cortical excitability was unchanged across drug conditions suggests the involvement of long-range intracortical interactions in this D1 effect. Because increased internal noise (and thus lower SNR) can impair visual perceptual learning, improving visual cortical SNR via D1/D2 agonist therapy may be useful in boosting rehabilitation programs involving visual perceptual training. SIGNIFICANCE STATEMENT In this study, we address the issue of whether dopamine activation improves visual perception despite increasing sensory noise in the visual cortex

  2. A framework of motion capture system based human behaviours simulation for ergonomic analysis

    CERN Document Server

    Ma, Ruina; Bennis, Fouad; Ma, Liang

    2011-01-01

    With the increasing of computer capabilities, Computer aided ergonomics (CAE) offers new possibilities to integrate conventional ergonomic knowledge and to develop new methods into the work design process. As mentioned in [1], different approaches have been developed to enhance the efficiency of the ergonomic evaluation. Ergonomic expert systems, ergonomic oriented information systems, numerical models of human, etc. have been implemented in numerical ergonomic software. Until now, there are ergonomic software tools available, such as Jack, Ergoman, Delmia Human, 3DSSPP, and Santos, etc. [2-4]. The main functions of these tools are posture analysis and posture prediction. In the visualization part, Jack and 3DSSPP produce results to visualize virtual human tasks in 3-dimensional, but without realistic physical properties. Nowadays, with the development of computer technology, the simulation of physical world is paid more attention. Physical engines [5] are used more and more in computer game (CG) field. The a...

  3. Entropy-driven binding of opioid peptides induces a large domain motion in human dipeptidyl peptidase III.

    Science.gov (United States)

    Bezerra, Gustavo A; Dobrovetsky, Elena; Viertlmayr, Roland; Dong, Aiping; Binter, Alexandra; Abramic, Marija; Macheroux, Peter; Dhe-Paganon, Sirano; Gruber, Karl

    2012-04-24

    Opioid peptides are involved in various essential physiological processes, most notably nociception. Dipeptidyl peptidase III (DPP III) is one of the most important enkephalin-degrading enzymes associated with the mammalian pain modulatory system. Here we describe the X-ray structures of human DPP III and its complex with the opioid peptide tynorphin, which rationalize the enzyme's substrate specificity and reveal an exceptionally large domain motion upon ligand binding. Microcalorimetric analyses point at an entropy-dominated process, with the release of water molecules from the binding cleft ("entropy reservoir") as the major thermodynamic driving force. Our results provide the basis for the design of specific inhibitors that enable the elucidation of the exact role of DPP III and the exploration of its potential as a target of pain intervention strategies.

  4. 76 FR 6572 - Non-Ambulatory Disabled Veal Calves and Other Non-Ambulatory Disabled Livestock at Slaughter...

    Science.gov (United States)

    2011-02-07

    ... inspection regulations to prohibit the slaughter of non-ambulatory disabled pigs, sheep, goats, and other... the mother's colostrum, iron deficient diets, intensive confinement, and lack of activity, result in... to require that non- ambulatory disabled pigs, sheep, goats, and other amenable livestock species...

  5. Human fixation and voluntary pursuit: the interaction between central and peripheral motion stimuli.

    NARCIS (Netherlands)

    E.P. Tamminga (Ernst Peter)

    1983-01-01

    textabstractVision is, for a human being, one of the most important senses. The basic function of vision, which is relevant for all species which have a form of vision, is spatial orientatione This function is important for postural control in tasks such as standing upright, walking around, guiding

  6. Two eyes, one vision: binocular motion perception in human visual cortex

    NARCIS (Netherlands)

    Barendregt, M.

    2016-01-01

    An important aspect of human vision is the fact that it is binocular, i.e. that we have two eyes. As a result, the brain nearly always receives two slightly different images of the same visual scene. Yet, we only perceive a single image and thus our brain has to actively combine the binocular visual

  7. Human gut-on-a-chip inhabited by microbial flora that experiences intestinal peristalsis-like motions and flow.

    Science.gov (United States)

    Kim, Hyun Jung; Huh, Dongeun; Hamilton, Geraldine; Ingber, Donald E

    2012-06-21

    Development of an in vitro living cell-based model of the intestine that mimics the mechanical, structural, absorptive, transport and pathophysiological properties of the human gut along with its crucial microbial symbionts could accelerate pharmaceutical development, and potentially replace animal testing. Here, we describe a biomimetic 'human gut-on-a-chip' microdevice composed of two microfluidic channels separated by a porous flexible membrane coated with extracellular matrix (ECM) and lined by human intestinal epithelial (Caco-2) cells that mimics the complex structure and physiology of living intestine. The gut microenvironment is recreated by flowing fluid at a low rate (30 μL h(-1)) producing low shear stress (0.02 dyne cm(-2)) over the microchannels, and by exerting cyclic strain (10%; 0.15 Hz) that mimics physiological peristaltic motions. Under these conditions, a columnar epithelium develops that polarizes rapidly, spontaneously grows into folds that recapitulate the structure of intestinal villi, and forms a high integrity barrier to small molecules that better mimics whole intestine than cells in cultured in static Transwell models. In addition, a normal intestinal microbe (Lactobacillus rhamnosus GG) can be successfully co-cultured for extended periods (>1 week) on the luminal surface of the cultured epithelium without compromising epithelial cell viability, and this actually improves barrier function as previously observed in humans. Thus, this gut-on-a-chip recapitulates multiple dynamic physical and functional features of human intestine that are critical for its function within a controlled microfluidic environment that is amenable for transport, absorption, and toxicity studies, and hence it should have great value for drug testing as well as development of novel intestinal disease models.

  8. Ambulatory blood pressure values in healthy children

    Directory of Open Access Journals (Sweden)

    Paripović Dušan

    2006-01-01

    Full Text Available Ambulatory blood pressure monitoring (ABPM is an important tool in the diagnosis and management of childhood hypertension. Normal ambulatory blood pressure (ABP values in children with body heights between 100 and 120 cm have not been reported. The aim of the study was to establish the normal range of values for ABPM in these children. 24-hour ABPM was performed in 40 normotensive (auscultatory casual blood pressure was obtained before ABPM subjects, aged from 4 to 6 years (26 males, 14 females with body heights between 95 and 125 cm. ABPM was carried out on non-dominant arm using the oscillometric device (SpaceLab 90207 with appropriate cuff size. The monitor was programmed to measure BP every 15 min. during the day (6 a.m. to 10 p.m. and every 30 min. during the night (10 p.m. to 6 a.m.. The mean daytime SBP/DBP in boys and girls was 108+/-6/67+/-5 and 105+/-5/66+/-1, respectively. The mean nighttime SBP/DBP in boys and girls was 98+/-6/56+/-5 and 97+/-7/56+/-4, respectively. There was a significant difference between day and night readings of SBP, DBP and heart rate (nocturnal fall was observed. The distribution of ABP noted in this study could serve as preliminary reference. A multicenter study should be performed to provide normal ranges of ABP.

  9. Comparative study of the two versions of the Microsoft Kinect$^{\\rm TM}$ sensor in regard to the analysis of human motion

    CERN Document Server

    Malinowski, M J

    2015-01-01

    The present paper is part of a broader programme, exploring the possibility of involving the Microsoft Kinect$^{\\rm TM}$ sensor in the analysis of human motion. In this study, the output obtained from the two available versions of this sensor is critically examined. We demonstrate that the two outputs differ in regard to the variation of the physical quantities involved in the modelling of the human motion. As the original sensor has been found unsuitable for applications requiring high precision, the observed differences in the output of the two sensors call for the validation of the upgraded sensor on the basis of a marker-based system.

  10. Design and experiment of human hand motion driven electromagnetic energy harvester using dual Halbach magnet array

    Science.gov (United States)

    Salauddin, M.; Park, Jae Y.

    2017-03-01

    We present a dual Halbach array electromagnetic energy harvester that generates significant power from hand shaking vibration. The magnetic-spring configuration is employed for generating sufficient power from the hand motion of irregular and low-frequency vibrations. However, significant power generation at low-frequency vibrations is challenging because the power flow decreases as the frequency decreases; moreover, designing a spring-mass system that is suitable for low-frequency-vibration energy harvesting is difficult. In this work, our proposed device overcomes both of these challenges by using a dual Halbach array and magnetic springs. During the experiment, vibration was applied in a horizontal direction to reduce the gravity effect on the Halbach-array structure. To achieve an increased power generation at low-amplitude and low-frequency vibrations, the magnetic structure of the dual Halbach array and the magnetic springs were optimized in terms of the operating frequency and the power density. A prototype was fabricated and tested both using a vibration exciter and by manual hand-shaking. The fabricated device showed resonant behavior during the vibration exciter test. For the vibration exciter test, the prototype device offers a maximum average power of 2.92 mW to a 62 Ω optimum load, at a 6 Hz resonance frequency and under a 0.5 g acceleration. The prototype device is capable of delivering a maximum average power of 2.27 mW from hand shaking. The fabricated device exhibited a normalized power density 0.46 mW cm‑2g‑2 which is very high compared to the current state-of-the-art devices, representing its ability in powering portable and wearable smart devices from extremely low frequency vibration.

  11. Tissue motion and strain in the human brain assessed by intraoperative ultrasound in glioma patients.

    Science.gov (United States)

    Selbekk, Tormod; Brekken, Reidar; Solheim, Ole; Lydersen, Stian; Hernes, Toril A N; Unsgaard, Geirmund

    2010-01-01

    The objective of the study was to investigate tissue motion and strain imposed by cardiovascular pulsation in pathologic and normal brain parenchyma, as quantified from in vivo ultrasound data. Ultrasound acquired during surgery of 16 patients with glial tumors was retrospectively processed and analyzed. The tissue velocity was quantified at depths of 1cm, 2cm and 3cm from brain cortex to investigate spatial dependency with depth. Comparison of strain and velocity in tumor and adjacent normal parenchyma was performed by selecting two regions-of-interest in the hyperechoic tumor and two regions in the low-echogenic areas interpreted as mainly normal tissue with some degree of tumor cell infiltration. The absolute maximum tissue velocity is seen to increase with increasing depths in 14 of 16 cases (87.5%). The maximum tissue velocities in the four regions close to the ultrasound visible tumor border are not statistically different (p=0.163 to p=0.975). The strain magnitudes are significantly higher in the regions with expected normal brain parenchyma than in regions with expected glial tumor tissue, both for the two regions being closest to the tumor border (p=0.0004) and for the two regions further away from the tumor border (p=0.0009). We conclude that the velocity of the brain parenchyma imposed by arterial pulsation during a cardiac cycle is generally increasing with increasing depth from cortex. The maximum velocity appears to be similar in regions with expected normal brain and tumor tissue, thus, does not seem to be affected by pathology. Strain magnitude is, however, a suitable parameter for discrimination of glial tumor and normal brain parenchyma. (E-mail: Tormod.Selbekk@sintef.no).

  12. Predictors of exercise participation in ambulatory and non-ambulatory older people with multiple sclerosis

    Directory of Open Access Journals (Sweden)

    Michelle Ploughman

    2015-08-01

    Full Text Available Background. Exercise at moderate intensity may confer neuroprotective benefits in multiple sclerosis (MS, however it has been reported that people with MS (PwMS exercise less than national guideline recommendations. We aimed to determine predictors of moderate to vigorous exercise among a sample of older Canadians with MS who were divided into ambulatory (less disabled and non-ambulatory (more disabled groups.Methods. We analysed data collected as part of a national survey of health, lifestyle and aging with MS. Participants (n = 743 were Canadians over 55 years of age with MS for 20 or more years. We identified ‘a priori’ variables (demographic, personal, socioeconomic, physical health, exercise history and health care support that may predict exercise at moderate to vigorous intensity (>6.75 metabolic equivalent hours/week. Predictive variables were entered into stepwise logistic regression until best fit was achieved.Results. There was no difference in explanatory models between ambulatory and non-ambulatory groups. The model predicting exercise included the ability to walk independently (OR 1.90, 95% CI [1.24–2.91]; low disability (OR 1.50, 95% CI [1.34–1.68] for each 10 point difference in Barthel Index score, perseverance (OR 1.17, 95% CI [1.08–1.26] for each additional point on the scale of 0–14, less fatigue (OR 2.01, 95% CI [1.32–3.07] for those in the lowest quartile, fewer years since MS diagnosis (OR 1.58, 95% CI [1.11–2.23] below the median of 23 years and fewer cardiovascular comorbidities (OR 1.55 95% CI [1.02–2.35] one or no comorbidities. It was also notable that the factors, age, gender, social support, health care support and financial status were not predictive of exercise.Conclusions. This is the first examination of exercise and exercise predictors among older, more disabled PwMS. Disability is a major predictor of exercise participation (at moderate to vigorous levels in both ambulatory and non-ambulatory

  13. Human Hand Motion Analysis and Synthesis of Optimal Power Grasps for a Robotic Hand

    Directory of Open Access Journals (Sweden)

    Francesca Cordella

    2014-03-01

    and experimental trials on an arm-hand robotic system. The obtained results have shown the effectiveness of the extracted indicators to reduce the non-linear optimization problem complexity and lead to the synthesis of a grasping posture able to replicate the human behaviour while ensuring grasp stability. The experimental results have also highlighted the limitations of the adopted robotic platform (mainly due to the mechanical structure to achieve the optimal grasp configuration.

  14. Channel Selection and Feature Projection for Cognitive Load Estimation Using Ambulatory EEG

    Directory of Open Access Journals (Sweden)

    Tian Lan

    2007-01-01

    Full Text Available We present an ambulatory cognitive state classification system to assess the subject's mental load based on EEG measurements. The ambulatory cognitive state estimator is utilized in the context of a real-time augmented cognition (AugCog system that aims to enhance the cognitive performance of a human user through computer-mediated assistance based on assessments of cognitive states using physiological signals including, but not limited to, EEG. This paper focuses particularly on the offline channel selection and feature projection phases of the design and aims to present mutual-information-based techniques that use a simple sample estimator for this quantity. Analyses conducted on data collected from 3 subjects performing 2 tasks (n-back/Larson at 2 difficulty levels (low/high demonstrate that the proposed mutual-information-based dimensionality reduction scheme can achieve up to 94% cognitive load estimation accuracy.

  15. Motion Planning for Human Crowds: from Individuals to Groups of Virtual Characters

    OpenAIRE

    Karamouzas, I.

    2012-01-01

    Virtual worlds, to become more lively and appealing, are typically populated by large crowds of virtual characters. One of the fundamental tasks that these characters have to perform is, on one hand, to plan their paths between different locations in the world and, on the other hand, to move toward their desired locations in a human-like manner avoiding collisions with each other and with the environment. This is the main topic of this thesis. Although the path planning problem has received c...

  16. Design and experiments of a self-charged power bank by harvesting sustainable human motion

    Directory of Open Access Journals (Sweden)

    Longhan Xie

    2016-05-01

    Full Text Available In this study, a self-charged power bank integrated with an energy harvester was developed to harness human biomechanical energy and sustainably recharge a power bank. In the energy harvester, a spring–mass damping system is used to transform the human body’s movement during walking into the rotation of a gear train and drive rotary generators to produce electricity to recharge the battery through a rectifying circuit. A mathematical model was built to examine the power output of the energy harvester under different excitation conditions. A prototype was built to test the performances of the harvester, and experiments on the prototype fixed on the ankle, wrist, and torso were conducted, which indicated that the measured power output was 0.35 W, 0.16 W, and 10 mW, respectively, when testers walked at 2.0 m/s (the circular frequency of foot step is about 14.5 rad/s. The experiments indicate that a higher walking velocity as well as excitation amplitude and frequency could result in higher output power.

  17. Reflex responses to combined hip and knee motion in human chronic spinal cord injury

    Directory of Open Access Journals (Sweden)

    Ming Wu, PhD

    2010-04-01

    Full Text Available The relative contributions of hip and knee proprioceptors to the origination of extensor spasms were examined in 11 subjects with chronic spinal cord injury (SCI. Ramp and hold extension and combined hip and knee oscillation movements were imposed to the right leg while the ankle was held in a static position by a custom-designed robot. Isometric joint torques of the hip, knee, and ankle and surface electromyograms (EMGs from seven leg muscles were recorded following controlled hip and knee extension. A stereotypical torque response consisting of hip flexion, knee extension, and ankle plantar flexion was observed following hip and knee perturbations. Further, the hip or knee joint posture modulated the spastic reflexes triggered by the extension movement of the other joint, with larger responses observed with the hip and knee extended. In addition, combined hip and knee oscillation movements were imposed to one leg with four different phasing conditions. The phasing between the hip and knee modulated the reflex activity triggered by hip and knee oscillations. The EMG patterns of the spastic reflexes were generally consistent with muscle timing during locomotion in human SCI. This knowledge may help identify rehabilitation strategies that produce functional movements in human SCI.

  18. Open source platform for collaborative construction of wearable sensor datasets for human motion analysis and an application for gait analysis.

    Science.gov (United States)

    Llamas, César; González, Manuel A; Hernández, Carmen; Vegas, Jesús

    2016-10-01

    Nearly every practical improvement in modeling human motion is well founded in a properly designed collection of data or datasets. These datasets must be made publicly available for the community could validate and accept them. It is reasonable to concede that a collective, guided enterprise could serve to devise solid and substantial datasets, as a result of a collaborative effort, in the same sense as the open software community does. In this way datasets could be complemented, extended and expanded in size with, for example, more individuals, samples and human actions. For this to be possible some commitments must be made by the collaborators, being one of them sharing the same data acquisition platform. In this paper, we offer an affordable open source hardware and software platform based on inertial wearable sensors in a way that several groups could cooperate in the construction of datasets through common software suitable for collaboration. Some experimental results about the throughput of the overall system are reported showing the feasibility of acquiring data from up to 6 sensors with a sampling frequency no less than 118Hz. Also, a proof-of-concept dataset is provided comprising sampled data from 12 subjects suitable for gait analysis.

  19. Highly flexible self-powered sensors based on printed circuit board technology for human motion detection and gesture recognition.

    Science.gov (United States)

    Fuh, Yiin-Kuen; Ho, Hsi-Chun

    2016-03-01

    In this paper, we demonstrate a new integration of printed circuit board (PCB) technology-based self-powered sensors (PSSs) and direct-write, near-field electrospinning (NFES) with polyvinylidene fluoride (PVDF) micro/nano fibers (MNFs) as source materials. Integration with PCB technology is highly desirable for affordable mass production. In addition, we systematically investigate the effects of electrodes with intervals in the range of 0.15 mm to 0.40 mm on the resultant PSS output voltage and current. The results show that at a strain of 0.5% and 5 Hz, a PSS with a gap interval 0.15 mm produces a maximum output voltage of 3 V and a maximum output current of 220 nA. Under the same dimensional constraints, the MNFs are massively connected in series (via accumulation of continuous MNFs across the gaps ) and in parallel (via accumulation of parallel MNFs on the same gap) simultaneously. Finally, encapsulation in a flexible polymer with different interval electrodes demonstrated that electrical superposition can be realized by connecting MNFs collectively and effectively in serial/parallel patterns to achieve a high current and high voltage output, respectively. Further improvement in PSSs based on the effect of cooperativity was experimentally realized by rolling-up the device into a cylindrical shape, resulting in a 130% increase in power output due to the cooperative effect. We assembled the piezoelectric MNF sensors on gloves, bandages and stockings to fabricate devices that can detect different types of human motion, including finger motion and various flexing and extensions of an ankle. The firmly glued PSSs were tested on the glove and ankle respectively to detect and harvest the various movements and the output voltage was recorded as ∼1.5 V under jumping movement (one PSS) and ∼4.5 V for the clenched fist with five fingers bent concurrently (five PSSs). This research shows that piezoelectric MNFs not only have a huge impact on harvesting various external

  20. Highly flexible self-powered sensors based on printed circuit board technology for human motion detection and gesture recognition

    Science.gov (United States)

    Fuh, Yiin-Kuen; Ho, Hsi-Chun

    2016-03-01

    In this paper, we demonstrate a new integration of printed circuit board (PCB) technology-based self-powered sensors (PSSs) and direct-write, near-field electrospinning (NFES) with polyvinylidene fluoride (PVDF) micro/nano fibers (MNFs) as source materials. Integration with PCB technology is highly desirable for affordable mass production. In addition, we systematically investigate the effects of electrodes with intervals in the range of 0.15 mm to 0.40 mm on the resultant PSS output voltage and current. The results show that at a strain of 0.5% and 5 Hz, a PSS with a gap interval 0.15 mm produces a maximum output voltage of 3 V and a maximum output current of 220 nA. Under the same dimensional constraints, the MNFs are massively connected in series (via accumulation of continuous MNFs across the gaps ) and in parallel (via accumulation of parallel MNFs on the same gap) simultaneously. Finally, encapsulation in a flexible polymer with different interval electrodes demonstrated that electrical superposition can be realized by connecting MNFs collectively and effectively in serial/parallel patterns to achieve a high current and high voltage output, respectively. Further improvement in PSSs based on the effect of cooperativity was experimentally realized by rolling-up the device into a cylindrical shape, resulting in a 130% increase in power output due to the cooperative effect. We assembled the piezoelectric MNF sensors on gloves, bandages and stockings to fabricate devices that can detect different types of human motion, including finger motion and various flexing and extensions of an ankle. The firmly glued PSSs were tested on the glove and ankle respectively to detect and harvest the various movements and the output voltage was recorded as ∼1.5 V under jumping movement (one PSS) and ∼4.5 V for the clenched fist with five fingers bent concurrently (five PSSs). This research shows that piezoelectric MNFs not only have a huge impact on harvesting various external

  1. Computer database of ambulatory EEG signals.

    Science.gov (United States)

    Jayakar, P B; Brusse, E; Patrick, J P; Shwedyk, E; Seshia, S S

    1987-01-01

    The paper describes an ambulatory EEG database. The database contains segments of AEEGs done on 45 subjects. Each epoch (1/8th second or more) of AEEG data has been annotated into 1 of 40 classes. The classes represent background activity, paroxysmal patterns and artifacts. The majority of classes have over 200 discrete epochs. The structure is flexible enough to allow additional epochs to be readily added. The database is stored on transportable media such as digital magnetic tape or hard disk and is thus available to other researchers in the field. The database can be used to design, evaluate and compare EEG signal processing algorithms and pattern recognition systems. It can also serve as an educational medium in EEG laboratories.

  2. [Ambulatory ureteral lithotripsy with "Modulith SL-20"].

    Science.gov (United States)

    González Enguita, C; Calahorra Fernández, F J; García de la Peña, E; Rodríguez-Miñón Cifuentes, J L; Vela Navarrete, R

    1993-03-01

    Analysis of our experience in 'in situ' ambulatory shockwave extracorporeal lithofragmentation of ureteral stones in 104 patients seen in the Lithotrity Unit, Urology Service, Fundación "Jiménez Díaz". Using Modulith SL 20, a third generation lithotripter, 'in situ' disintegration was achieved in 82.69% of cases, 51.92% of which were fragmented in a single lithotrity session. As a first choice, no ureteral handling was used in any of the patients prior to lithotrity. In 9.62% of patients it was necessary to place a 'double J' by-pass catheter, due to the disease presenting with a septic picture. The patient's position was either dorsal or ventral decubitus depending on the lithiatic site, while location and focusing of the stones was done radiologically. All patients were treated ambulatory without hospitalization. Only 18% was given oral or i.v. anaesthesia. Fursemide 40 mg was administered to all patients shortly before starting the session. Each patient received an average of 3,200 shockwaves per session (14-18 Kv, average 16 Kv). Haematuria was the single and modest side effect that happened during the 24 hours following lithofragmentation in 30% of patients, while 20% reported slight discomfort at the time of eliminating the gritted stones. We conclude stating that 'in situ' shockwave extracorporeal lithotrity of ureteral stones with Modulith SL 20 allows for elective disintegration of ureteral stones in whatever location they are found, due to the patient's easy positioning. The simple location and focusing of ureteral stones has allowed us to treat and solve some cases of ureteral lithiasis at the precise moment of the nephritic colic painful emergency, thus speeding up and facilitating the resolution of the condition. Our results and our strategy imply a new change of direction in the management of these lithiasis, as opposed to the well established and historical doctrines in existence regarding stones with ureteral location.

  3. List-mode PET motion correction using markerless head tracking: proof-of-concept with scans of human subject.

    Science.gov (United States)

    Olesen, Oline V; Sullivan, Jenna M; Mulnix, Tim; Paulsen, Rasmus R; Højgaard, Liselotte; Roed, Bjarne; Carson, Richard E; Morris, Evan D; Larsen, Rasmus

    2013-02-01

    A custom designed markerless tracking system was demonstrated to be applicable for positron emission tomography (PET) brain imaging. Precise head motion registration is crucial for accurate motion correction (MC) in PET imaging. State-of-the-art tracking systems applied with PET brain imaging rely on markers attached to the patient's head. The marker attachment is the main weakness of these systems. A healthy volunteer participating in a cigarette smoking study to image dopamine release was scanned twice for 2 h with (11)C-racolopride on the high resolution research tomograph (HRRT) PET scanner. Head motion was independently measured, with a commercial marker-based device and the proposed vision-based system. A list-mode event-by-event reconstruction algorithm using the detected motion was applied. A phantom study with hand-controlled continuous random motion was obtained. Motion was time-varying with long drift motions of up to 18 mm and regular step-wise motion of 1-6 mm. The evaluated measures were significantly better for motion-corrected images compared to no MC. The demonstrated system agreed with a commercial integrated system. Motion-corrected images were improved in contrast recovery of small structures.

  4. Human Motion Tracking and Glove-Based User Interfaces for Virtual Environments in ANVIL

    Science.gov (United States)

    Dumas, Joseph D., II

    2002-01-01

    The Army/NASA Virtual Innovations Laboratory (ANVIL) at Marshall Space Flight Center (MSFC) provides an environment where engineers and other personnel can investigate novel applications of computer simulation and Virtual Reality (VR) technologies. Among the many hardware and software resources in ANVIL are several high-performance Silicon Graphics computer systems and a number of commercial software packages, such as Division MockUp by Parametric Technology Corporation (PTC) and Jack by Unigraphics Solutions, Inc. These hardware and software platforms are used in conjunction with various VR peripheral I/O (input / output) devices, CAD (computer aided design) models, etc. to support the objectives of the MSFC Engineering Systems Department/Systems Engineering Support Group (ED42) by studying engineering designs, chiefly from the standpoint of human factors and ergonomics. One of the more time-consuming tasks facing ANVIL personnel involves the testing and evaluation of peripheral I/O devices and the integration of new devices with existing hardware and software platforms. Another important challenge is the development of innovative user interfaces to allow efficient, intuitive interaction between simulation users and the virtual environments they are investigating. As part of his Summer Faculty Fellowship, the author was tasked with verifying the operation of some recently acquired peripheral interface devices and developing new, easy-to-use interfaces that could be used with existing VR hardware and software to better support ANVIL projects.

  5. Perceptual learning of motion direction discrimination with suppressed and unsuppressed MT in humans: an fMRI study.

    Directory of Open Access Journals (Sweden)

    Benjamin Thompson

    Full Text Available The middle temporal area of the extrastriate visual cortex (area MT is integral to motion perception and is thought to play a key role in the perceptual learning of motion tasks. We have previously found, however, that perceptual learning of a motion discrimination task is possible even when the training stimulus contains locally balanced, motion opponent signals that putatively suppress the response of MT. Assuming at least partial suppression of MT, possible explanations for this learning are that 1 training made MT more responsive by reducing motion opponency, 2 MT remained suppressed and alternative visual areas such as V1 enabled learning and/or 3 suppression of MT increased with training, possibly to reduce noise. Here we used fMRI to test these possibilities. We first confirmed that the motion opponent stimulus did indeed suppress the BOLD response within hMT+ compared to an almost identical stimulus without locally balanced motion signals. We then trained participants on motion opponent or non-opponent stimuli. Training with the motion opponent stimulus reduced the BOLD response within hMT+ and greater reductions in BOLD response were correlated with greater amounts of learning. The opposite relationship between BOLD and behaviour was found at V1 for the group trained on the motion-opponent stimulus and at both V1 and hMT+ for the group trained on the non-opponent motion stimulus. As the average response of many cells within MT to motion opponent stimuli is the same as their response to non-directional flickering noise, the reduced activation of hMT+ after training may reflect noise reduction.

  6. Mechanical properties and motion of the cupula of the human semicircular canal.

    Science.gov (United States)

    Selva, Pierre; Oman, Charles M; Stone, Howard A

    2009-01-01

    The mathematical model for the dynamics of the cupula-endolymph system of the inner ear semicircular canal, as elaborated by numerous investigators, remains a foundational tool in all of vestibular physiology. Most models represent the cupula as a linear spring-like element of stiffness K=DeltaP/DeltaV, where DeltaV is the volume displaced upon application of a pressure difference DeltaP. The parameter K directly influences the long time constant of the cupula-endolymph system. Given estimates of K based on experiments, we use thick and thin bending membrane theory, and also finite-element simulations based on more realistic cupula morphologies, to estimate the human cupula's Young's modulus E approximately 5.4 Pa. We show that for a model morphology, thick bending membrane theory and finite-element predictions are in good agreement, and conclude that the morphology of the attachment of the cupula to the slope of the crista should not greatly influence the volume displacement. We note, however, that other biological materials with very low E are hydrogels that have significant viscoelastic properties. Experiments to directly measure E and investigate potential viscoelastic behavior ultimately may be needed. In addition, based on experimental images we study two other different shapes for the cupula and quantify their impact on the deflection of the cupula. We also use a three-dimensional finite-element model to analyze both the shear strain distribution and its time evolution near the sensory epithelium. We conclude that stimulation of sensory hair cells probably begins at the centre of the crista and spreads toward the periphery of the cupula and down the sides of the crista. Thus, spatio-temporal variations in the shearing stimulus are predicted to impact subsequent transduction and encoding. Finally, modeling the fluid-filled vertical channels believed to lie within the cupula, we investigate the impact of different tube diameters on the transverse displacement

  7. Computerized adaptive testing--ready for ambulatory monitoring?

    DEFF Research Database (Denmark)

    Rose, Matthias; Bjørner, Jakob; Fischer, Felix

    2012-01-01

    Computerized adaptive tests (CATs) have abundant theoretical advantages over established static instruments, which could improve ambulatory monitoring of patient-reported outcomes (PROs). However, an empirical demonstration of their practical benefits is warranted....

  8. Ambulatory Pessary Trial Unmasks Occult Stress Urinary Incontinence

    Directory of Open Access Journals (Sweden)

    Bilal Chughtai

    2012-01-01

    Conclusion. An ambulatory pessary trial is an effective, easy, and inexpensive method to approximate anatomic results achieved by surgery under real-life conditions. In our series, 20% of patients with occult SUI were identified by pessary trial alone.

  9. Prevalência ambulatorial em um hospital geral de marcadores para hepatites B e C em pacientes com infecção pelo vírus da imunodeficiência humana Ambulatorial prevalence of hepatitis B and C markers in patients with human immunodeficiency virus infection in a general hospital

    Directory of Open Access Journals (Sweden)

    Cristiane Valle Tovo

    2006-06-01

    Full Text Available RACIONAL: Os vírus das hepatites B (VHB e C (VHC e da imunodeficiência humana (HIV utilizam a mesma rota de transmissão, sendo a prevalência de VHB e VHC em pacientes infectados pelo HIV maior do que aquela encontrada na população em geral. OBJETIVO: Determinar a prevalência de marcadores para hepatites B e C em uma população de pacientes com HIV, bem como os fatores de risco envolvidos. PACIENTES E MÉTODOS: Dentre os 5 870 prontuários de pacientes com HIV em acompanhamento no Serviço de Infectologia do Hospital Nossa Senhora da Conceição, Porto Alegre, RS, foram aleatoriamente selecionados 587 prontuários. Destes, foram considerados para análise retrospectiva aqueles em que havia sido pesquisado algum marcador para hepatites B (HBsAg, anti-HBc ou anti-HBs ou C (anti-VHC, perfazendo o total de 343 pacientes. RESULTADOS: O HBsAg foi positivo em 14 de 306 (4,6% pacientes, anticorpo anti-HBs, em 40 de 154 (26,0% pacientes, e anti-HBc em 79 de 205 (38,5% pacientes. Dentre aqueles que realizaram anti-VHC, 126 de 330 (38,2% tinham-no positivo. Co-infecção por vírus B e C foi observada em 7 dentre os 296 pacientes que realizaram tanto o HBsAg, quanto o anti-VHC (2,4%. Dentre aqueles HBsAg positivos, a principal categoria de exposição foi o relacionamento homossexual masculino (50,0%. Dentre aqueles anti-VHC positivos, a principal categoria de exposição foi o uso de drogas ilícitas injetáveis (75,3%. Naqueles monoinfectados com HIV (185 pacientes, o fator de risco mais prevalente foi relacionamento heterossexual promíscuo ou com cônjuge infectado por HIV em 83 pacientes (44,9%. CONCLUSÃO: Em nosso meio, as co-infecções VHB-HIV e VHC-HIV são freqüentes, sendo observado maior impacto na associação do VHC com o HIV.BACKGROUND: Hepatitis B and C viruses and human immunodeficiency virus share the same route of transmission, and the prevalence of HBV and HCV infection in patients infected with HIV is greater than it is in the

  10. 基于人体动作姿态识别的机器人仿人运动%Humanoid Motion of Manipulator that Based on Human-posture Recognition

    Institute of Scientific and Technical Information of China (English)

    王梅; 卢熙昌; 屠大维; 于远芳; 周华

    2016-01-01

    以关节式机器人为对象,进行机器人仿人运动研究。从人体动作姿态识别、人-机动作映射、机器人运动控制等方面,详细阐述机器人仿人运动算法。提出人体动作姿态识别方法,利用 Kinect 传感器捕获人体运作的关节点位置信息,在建立人体基准坐标系的基础上,为了得到描述肩、肘运动的动作信息,计算人体手臂动作的关节角度,实现人体动作姿态的识别。在分析人体肩、肘等关节和机器人机构差异性的基础上,建立人体手臂与四自由度机械手臂的人-机动作映射规则。针对机器人自由度较少,无法完全复现人体运动的情形,分析、比较不同控制策略的优缺点和适用性,寻求适合机器人操作的复现控制策略。关节式机器人接收运动控制指令,执行相应的关节运动,从而实现机器人仿人运动。相关试验验证了人体动作姿态识别和机器人仿人运动控制算法的有效性。研究成果对于提高机器人控制和操作的简单易用性、提高人机交互能力具有借鉴意义,对于扩展机器人应用领域具有实践意义。%Humanoid motion of manipulator is studied. The problem of human-posture recognition, human-robot motion mapping and humanoid motion control are summarized. A Kinect is used to capture the human body movement. In the coordinate system on the human body, the joint angles of the human arm are calculated to recognize the motion of shoulder joint and elbow joint. By analyzing the difference between the motion of a human arm and that of a four-degree manipulator, the human-robot motion mapping is developed. To deal with the problem of limitation in motion imitation, caused by robot lower-mobility, three method of humanoid control is comparatively analyzed. And the method to maximize the range of motion is selected to control the manipulator. The manipulator would execute the action, according to the

  11. Automatic shape recognition of human limbs to avoid errors due to skin marker shifting in motion analysis

    Science.gov (United States)

    Hatze, Herbert; Baca, Arnold

    1991-12-01

    A new method in human motion analysis is presented for overcoming the problem of the shifting of skin-mounted position markers relative to the skeleton. The present version of the method is based on two-dimensional video processing and involves the recording of subjects wearing special clothing. The clothing is designed in such a way as to permit the unambiguous spatial shape recognition of each of the 17 body segments by means of an edge detection algorithm. The latter and the algorithms for the computation of segment translation and rotation constitute improved versions of previously used algorithms, especially with respect to the execution times of the respective computer program on ordinary PCs. From the recognized shapes, the translation and rotation of each segment relative to its initial configuration is computed by using positional information from the previous frames. For the first frame to be analyzed, a starting algorithm has to be applied. Finally, the configurational coordinates of the body model are calculated from the respective spatial linear and angular positions.

  12. Multifunctional Setup for Studying Human Motor Control Using Transcranial Magnetic Stimulation, Electromyography, Motion Capture, and Virtual Reality.

    Science.gov (United States)

    Talkington, William J; Pollard, Bradley S; Olesh, Erienne V; Gritsenko, Valeriya

    2015-09-03

    The study of neuromuscular control of movement in humans is accomplished with numerous technologies. Non-invasive methods for investigating neuromuscular function include transcranial magnetic stimulation, electromyography, and three-dimensional motion capture. The advent of readily available and cost-effective virtual reality solutions has expanded the capabilities of researchers in recreating "real-world" environments and movements in a laboratory setting. Naturalistic movement analysis will not only garner a greater understanding of motor control in healthy individuals, but also permit the design of experiments and rehabilitation strategies that target specific motor impairments (e.g. stroke). The combined use of these tools will lead to increasingly deeper understanding of neural mechanisms of motor control. A key requirement when combining these data acquisition systems is fine temporal correspondence between the various data streams. This protocol describes a multifunctional system's overall connectivity, intersystem signaling, and the temporal synchronization of recorded data. Synchronization of the component systems is primarily accomplished through the use of a customizable circuit, readily made with off the shelf components and minimal electronics assembly skills.

  13. Pros and cons of the ambulatory surgery center joint venture.

    Science.gov (United States)

    Giannini, Deborah

    2008-01-01

    If a physician group has determined that it has a realistic patient base to establish an ambulatory surgery center, it may be beneficial to consider a partner to share the costs and risks of this new joint venture. Joint ventures can be a benefit or liability in the establishment of an ambulatory surgery center. This article discusses the advantages and disadvantages of a hospital physician-group joint venture.

  14. Human resources needs for universal access to antiretroviral therapy in South Africa: a time and motion study

    Directory of Open Access Journals (Sweden)

    Hontelez Jan AC

    2012-10-01

    Full Text Available Abstract Background Although access to life-saving treatment for patients infected with HIV in South Africa has improved substantially since 2004, treating all eligible patients (universal access remains elusive. As the prices of antiretroviral drugs have dropped over the past years, availability of human resources may now be the most important barrier to achieving universal access to HIV treatment in Africa. We quantify the number of HIV health workers (HHWs required to be added to the current HIV workforce to achieve universal access to HIV treatment in South Africa, under different eligibility criteria. Methods We performed a time and motion study in three HIV clinics in a rural, primary care-based HIV treatment program in KwaZulu-Natal, South Africa, to estimate the average time per patient visit for doctors, nurses, and counselors. We estimated the additional number of HHWs needed to achieve universal access to HIV treatment within one year. Results For universal access to HIV treatment for all patients with a CD4 cell count of ≤350 cells/μl, an additional 2,200 nurses, 3,800 counselors, and 300 doctors would be required, at additional annual salary cost of 929 million South African rand (ZAR, equivalent to US$ 141 million. For universal treatment (‘treatment as prevention’, an additional 6,000 nurses, 11,000 counselors, and 800 doctors would be required, at an additional annual salary cost of ZAR 2.6 billion (US$ 400 million. Conclusions Universal access to HIV treatment for patients with a CD4 cell count of ≤350 cells/μl in South Africa may be affordable, but the number of HHWs available for HIV treatment will need to be substantially increased. Treatment as prevention strategies will require considerable additional financial and human resources commitments.

  15. List-Mode PET Motion Correction Using Markerless Head Tracking: Proof-of-Concept With Scans of Human Subject

    DEFF Research Database (Denmark)

    Olesen, Oline Vinter; Sullivan, Jenna M.; Mulnix, Tim;

    2013-01-01

    A custom designed markerless tracking system was demonstrated to be applicable for positron emission tomography (PET) brain imaging. Precise head motion registration is crucial for accurate motion correction (MC) in PET imaging. State-of-the-art tracking systems applied with PET brain imaging rel...

  16. Continuous ambulatory peritoneal dialysis: Indian scenario.

    Science.gov (United States)

    Abraham, Georgi; Mathew, Milli; Hinduja, Anish; Padma, G

    2002-03-01

    Chronic peritoneal dialysis (CPD) has been initiated as a treatment modality for chronic renal failure patients in the Indian subcontinent since 1990. Over a period of 9 years both continuous ambulatory peritoneal dialysis (CAPD) and continuous cyclic peritoneal dialysis (CCPD) have emerged as accepted forms of renal replacement therapy in our country. Although there were government restrictions on import of dialysis fluid until 1993, the availability of locally manufactured fluid in collapsible bags had facilitated the expansion of the programme to the far corners of the country and in neighbouring countries. Initially majority (78%) of the patients who were started on this programme were diabetics with other comorbid conditions who were drop-outs from haemodialysis and unfit for transplantation. Both CAPD and CCPD have been used for all age groups and for men and women. Majority of the patients do 3 x 2 l exchanges a day on CAPD; 8-10 l using a cycler at night those who are onCCPD. Peritonitis rate was 1 episode every 18 patient months. With the introduction of new connection and disposable sets the incidence of peritonitis is dropping down. The major cause of drop-out is cardiovascular death followed by peritonitis. Malnutrition is a major problem in both CAPD and haemodialysis patients. The programme has been expanded and there are over one thousand patients on this treatment in the country. The introduction of CPD had a major impact on the treatment of renal failure in India.

  17. Cuff inflation during ambulatory blood pressure monitoring and heart rate

    Directory of Open Access Journals (Sweden)

    Mia Skov-Madsen

    2008-11-01

    Full Text Available Mia Skov-Madsen, My Svensson, Jeppe Hagstrup ChristensenDepartment of Nephrology, Aarhus University Hospital, Aalborg, DenmarkIntroduction: Twenty four-hour ambulatory blood pressure monitoring is a clinically validated procedure in evaluation of blood pressure (BP. We hypothesised that the discomfort during cuff inflation would increase the heart rate (HR measured with 24-h ambulatory BP monitoring compared to a following HR measurement with a 24-h Holter monitor.Methods: The study population (n = 56 were recruited from the outpatient’s clinic at the Department of Nephrology, Aalborg Hospital, Aarhus University Hospital at Aalborg, Denmark. All the patients had chronic kidney disease (CKD. We compared HR measured with a 24-h Holter monitor with a following HR measured by a 24-h ambulatory BP monitoring.Results: We found a highly significant correlation between the HR measured with the Holter monitor and HR measured with 24-h ambulatory blood pressure monitoring (r = 0.77, p < 0.001. Using the Bland-Altman plot, the mean difference in HR was only 0.5 beat/min during 24 hours with acceptable limits of agreement for both high and low HR levels. Dividing the patients into groups according to betablocker treatment, body mass index, age, sex, angiotensin-converting enzyme inhibitor treatment, statins treatment, diuretic treatment, or calcium channel blocker treatment revealed similar results as described above.Conclusion: The results indicate that the discomfort induced by cuff inflation during 24-h ambulatory BP monitoring does not increase HR. Thus, 24-h ambulatory BP monitoring may be a reliable measurement of the BP among people with CKD.Keywords: ambulatory blood pressure monitoring, Holter monitoring, heart rate, chronic kidney disease, hypertension

  18. Surgical Site Infections Following Pediatric Ambulatory Surgery: An Epidemiologic Analysis.

    Science.gov (United States)

    Rinke, Michael L; Jan, Dominique; Nassim, Janelle; Choi, Jaeun; Choi, Steven J

    2016-08-01

    OBJECTIVE To identify surgical site infection (SSI) rates following pediatric ambulatory surgery, SSI outcomes and risk factors, and sensitivity and specificity of SSI administrative billing codes. DESIGN Retrospective chart review of pediatric ambulatory surgeries with International Classification of Disease, Ninth Revision (ICD-9) codes for SSI, and a systematic random sampling of 5% of surgeries without SSI ICD-9 codes, all adjudicated for SSI on the basis of an ambulatory-adapted National Healthcare Safety Network definition. SETTING Urban pediatric tertiary care center April 1, 2009-March 31, 2014. METHODS SSI rates and sensitivity and specificity of ICD-9 codes were estimated using sampling design, and risk factors were analyzed in case-rest of cohort, and case-control, designs. RESULTS In 15,448 pediatric ambulatory surgeries, 34 patients had ICD-9 codes for SSI and 25 met the adapted National Healthcare Safety Network criteria. One additional SSI was identified with systematic random sampling. The SSI rate following pediatric ambulatory surgery was 2.9 per 1,000 surgeries (95% CI, 1.2-6.9). Otolaryngology surgeries demonstrated significantly lower SSI rates compared with endocrine (P=.001), integumentary (P=.001), male genital (Psurgeries. Almost half of patients with an SSI were admitted, 88% received antibiotics, and 15% returned to the operating room. No risk factors were associated with SSI. The sensitivity of ICD-9 codes for SSI following ambulatory surgery was 55.31% (95% CI, 12.69%-91.33%) and specificity was 99.94% (99.89%-99.97%). CONCLUSIONS SSI following pediatric ambulatory surgery occurs at an appreciable rate and conveys morbidity on children. Infect Control Hosp Epidemiol 2016;37:931-938.

  19. Human Motion Measuring Equipment Based on Acceleration Sensor%基于加速度传感器的无线人体动作测量设备

    Institute of Scientific and Technical Information of China (English)

    王冲; 施玉霞; 陆熊

    2011-01-01

    使用ADXL345三轴加速度传感器、nRF24LO1无线收发芯片及USB接口芯片CY7C68013与上位机构建了一个人体动作信息测量设备。该设备由5组相同的动作测量模块、1组数据接收模块构成。动作测量模块置于人体四肢及躯干测量人体动作信息,数据接收模块通过无线方式收集加速度数据,并通过USB芯片上传给PC机,PC机计算出各部位的角度信息后绘制人体实时动作模型。通过与实际人体动作比较,该设备可以较好地反应人体动作情况,可以应用于多种人机交互场合。%A kind of human motion information measuring equipment is built by ADXL345 accelerometer, nRF24L01 radio transceiver, CY7C68013 USB interface chip and PC. This equipment is consisted of five groups of measuring modules and a data receiver module. The measuring module is placed on the limbs and trunk, measuring the human body motion information. The data receiver module collects body movement data from five measuring modules and uploads the data to PC via USB. PC calculates the angle information of each part of the human body and draw human body motion model in real time. By comparison with the actual human motion, the equipment responds well to the situation of human motion, which can be used to a variety of human computer interaction applications.

  20. Displacement of the medial meniscus within the passive motion characteristics of the human knee joint: an RSA study in human cadaver knees.

    Science.gov (United States)

    Tienen, T G; Buma, P; Scholten, J G F; van Kampen, A; Veth, R P H; Verdonschot, N

    2005-05-01

    The objective of this study was to validate an in vitro human cadaver knee-joint model for the evaluation of the meniscal movement during knee-joint flexion. The question was whether our model showed comparable meniscal displacements to those found in earlier meniscal movement studies in vivo. Furthermore, we determined the influence of tibial torque on the meniscal displacement during knee-joint flexion. Three tantalum beads were inserted in the medial meniscus of six human-cadaver joints. The knee joints were placed and loaded in a loading apparatus, and the movements of the beads were determined by means of RSA during knee-joint flexion and extension with and without internal tibial (IT) and external tibial (ET) torque. During flexion without tibial torque, all menisci moved in posterior and lateral direction. The anterior horn showed significantly greater excursions than the posterior horn in both posterior and lateral direction. Internal tibial torque caused an anterior displacement of the pathway on the tibial plateau. External tibial torque caused a posterior displacement of the pathway. External tibial torque restricted the meniscal displacement during the first 30 degrees of knee-joint flexion. The displacements of the meniscus in this experiment were similar to the displacements described in the in vivo MRI studies. Furthermore, the application of tibial torque confirmed the relative immobility of the posterior horn of the meniscus. During external tibial torque, the posterior displacement of the pathway on the tibial plateau during the first 30 degrees of flexion might be restricted by the attached knee-joint capsule or the femoral condyle. This model revealed representative meniscal displacements during simple knee-joint flexion and also during the outer limits of passive knee-joint motion.

  1. A cable-driven wrist robotic rehabilitator using a novel torque-field controller for human motion training

    Science.gov (United States)

    Chen, Weihai; Cui, Xiang; Zhang, Jianbin; Wang, Jianhua

    2015-06-01

    Rehabilitation technologies have great potentials in assisted motion training for stroke patients. Considering that wrist motion plays an important role in arm dexterous manipulation of activities of daily living, this paper focuses on developing a cable-driven wrist robotic rehabilitator (CDWRR) for motion training or assistance to subjects with motor disabilities. The CDWRR utilizes the wrist skeletal joints and arm segments as the supporting structure and takes advantage of cable-driven parallel design to build the system, which brings the properties of flexibility, low-cost, and low-weight. The controller of the CDWRR is designed typically based on a virtual torque-field, which is to plan "assist-as-needed" torques for the spherical motion of wrist responding to the orientation deviation in wrist motion training. The torque-field controller can be customized to different levels of rehabilitation training requirements by tuning the field parameters. Additionally, a rapidly convergent parameter self-identification algorithm is developed to obtain the uncertain parameters automatically for the floating wearable structure of the CDWRR. Finally, experiments on a healthy subject are carried out to demonstrate the performance of the controller and the feasibility of the CDWRR on wrist motion training or assistance.

  2. Weighted augmented Jacobian matrix with a variable coefficient method for kinematics mapping of space teleoperation based on human-robot motion similarity

    Science.gov (United States)

    Shi, Zhong; Huang, Xuexiang; Hu, Tianjian; Tan, Qian; Hou, Yuzhuo

    2016-10-01

    Space teleoperation is an important space technology, and human-robot motion similarity can improve the flexibility and intuition of space teleoperation. This paper aims to obtain an appropriate kinematics mapping method of coupled Cartesian-joint space for space teleoperation. First, the coupled Cartesian-joint similarity principles concerning kinematics differences are defined. Then, a novel weighted augmented Jacobian matrix with a variable coefficient (WAJM-VC) method for kinematics mapping is proposed. The Jacobian matrix is augmented to achieve a global similarity of human-robot motion. A clamping weighted least norm scheme is introduced to achieve local optimizations, and the operating ratio coefficient is variable to pursue similarity in the elbow joint. Similarity in Cartesian space and the property of joint constraint satisfaction is analysed to determine the damping factor and clamping velocity. Finally, a teleoperation system based on human motion capture is established, and the experimental results indicate that the proposed WAJM-VC method can improve the flexibility and intuition of space teleoperation to complete complex space tasks.

  3. Human Body Motion Detective Home Security System with Automatic Lamp and User Programmable Text Alert GSM Mobile Phone Number, Unique PIN to Allow Universal Users Using PIR Sensor

    Directory of Open Access Journals (Sweden)

    Oyebola B. O

    2015-06-01

    Full Text Available Insecurity is not a credit to any responsible society, and the conventional use of watch-man has drawbacks of huge risk of life and cost intensive. The use home security system with user programmable text alert GSM mobile phone number with unique PIN to allow universal users with human body motion detective can overcome these limitations. This paper presents reliable security system that is able to recognize human body motion and send an alert message to inform the owner(at any location in the world where there is GSM mobile network coverage of the house through an SMS alert when an unwanted visitor or thief enters the range of the sensor. The system design is in three main phases: the sensitivity, central processing and action. The sensitivity is the perception section that is done through PIR sensor mounted at watch-area, central processing is performed by a programmed microcontroller, and the action (task is done through an interaction of an attached on-board GSM module to the processor (the microcontroller which then send an SMS alert to the user or owner mobile phone number. This system is design to only detect only (or part of human body motion.

  4. Advances in the use of intravenous techniques in ambulatory anesthesia

    Directory of Open Access Journals (Sweden)

    Eng MR

    2015-07-01

    Full Text Available Matthew R Eng,1 Paul F White1,2 1Department of Anesthesiology, Cedars-Sinai Medical Center, Los Angeles, CA, USA; 2White Mountain Institute, The Sea Ranch, CA, USA Summary statement: Advances in the use of intravenous techniques in ambulatory anesthesia has become important for the anesthesiologist as the key perioperative physician in outpatient surgery. Key techniques and choices of anesthetics are important in accomplishing fast track goals of ambulatory surgery. Purpose of review: The anesthesiologist in the outpatient environment must focus on improving perioperative efficiency and reducing recovery times while accounting for patients' well-being and safety. This review article focuses on recent intravenous anesthetic techniques to accomplish these goals. Recent findings: This review is an overview of techniques in intravenous anesthesia for ambulatory anesthesia. Intravenous techniques may be tailored to accomplish outpatient surgery goals for the type of surgical procedure and individual patient needs. Careful anesthetic planning and the application of the plans are critical to an anesthesiologist's success with fast-track ambulatory surgery. Conclusion: Careful planning and application of intravenous techniques are critical to an anesthesiologist's success with fast-track ambulatory surgery. Keywords: intravenous anesthesia, outpatient anesthesia, fast-track surgery

  5. Ambulatory anesthesia in plastic surgery: opportunities and challenges

    Directory of Open Access Journals (Sweden)

    Facque AR

    2015-10-01

    Full Text Available Alexander R Facque, Peter J Taub Division of Plastic and Reconstructive Surgery, Department of Surgery, Mount Sinai Medical Center, New York, NY, USA Abstract: In 2013, there were 17 million procedures performed by plastic and reconstructive surgeons in the United States in the private office or ambulatory “surgicenter” setting, as well as additional operations performed in hospitals on an outpatient basis. As interest in performing increasingly complex surgical procedures on an outpatient basis continues to grow, the surgeon and anesthesiologist alike must be prepared to offer safe and reliable anesthesia and analgesia in the ambulatory setting. Surgeons must be aware of the possible techniques that will be employed in their surgeries in order to anticipate and prepare patients for possible postoperative side effects, and anesthesiologists must be prepared to offer such techniques in order to ensure a relatively rapid return to normal activity despite potentially having undergone major surgery. The following is a review of the specific considerations that should be given to ambulatory plastic surgery patients with comments on recent developments in the techniques used to safely administer agreeable and effective anesthesia. Keywords: ambulatory surgery, cosmetic anesthesia, outpatient, ambulatory anesthesia

  6. Patient satisfaction and positive patient outcomes in ambulatory anesthesia

    Directory of Open Access Journals (Sweden)

    Shah U

    2015-04-01

    Full Text Available Ushma Shah, David T Wong, Jean Wong Department of Anesthesia, Toronto Western Hospital, University Health Network, University of Toronto, Toronto, ON, Canada Abstract: Most surgeries in North America are performed on an ambulatory basis, reducing health care costs and increasing patient comfort. Patient satisfaction is an important outcome indicator of the quality of health care services incorporated by the American Society of Anesthesiologists (ASA. Patient satisfaction is a complex concept that is influenced by multiple factors. A patient's viewpoint and knowledge plays an influential role in patient satisfaction with ambulatory surgery. Medical optimization and psychological preparation of the patient plays a pivotal role in the success of ambulatory surgery. Postoperative pain, nausea, and vomiting are the most important symptoms for the patient and can be addressed by multimodal drug regimens. Shared decision making, patient–provider relationship, communication, and continuity of care form the main pillars of patient satisfaction. Various psychometrically developed instruments are available to measure patient satisfaction, such as the Iowa Satisfaction with Anesthesia Scale and Evaluation du Vecu de I'Anesthesie Generale, but none have been developed specifically for ambulatory surgery. The ASA has made recommendations for data collection for patient satisfaction surveys and emphasized the importance of reporting the data to the Anesthesia Quality Institute. Future research is warranted to develop a validated tool to measure patient satisfaction in ambulatory surgery. Keywords: patient, satisfaction, anesthesia, outcomes, questionnaire, perspectives

  7. Ambulatory laparoscopic cholecystectomy: A single center experience

    Directory of Open Access Journals (Sweden)

    Cagri Tiryaki

    2016-01-01

    Full Text Available Aim: To evaluate the demographic and clinical parameters affecting the outcomes of ambulatory laparoscopic cholecystectomy (ALC in terms of pain, nausea, anxiety level, and satisfaction of patients in a tertiary health center. Materials and Methods: ALC was offered to 60 patients who met the inclusion criteria. Follow-up (questioning for postoperative pain or discomfort, nausea or vomiting, overall satisfaction was done by telephone contact on the same day at 22:00 p.m. and the first day after surgery at 8: 00 a.m. and by clinical examination one week after operation. STAI I and II data were used for proceeding to the level of anxiety of patients before and/or after the operation. Results: Sixty consecutive patients, with a mean age of 40.6 ± 8.1 years underwent ALC. Fifty-five (92% patients could be sent to their homes on the same day but five patients could not be sent due to anxiety, pain, or social indications. Nausea was reported in four (6.7% cases and not associated with any demographic or clinical features of patients. On the other hand, pain has been reported in 28 (46.7% cases, and obesity and shorter duration of gallbladder disease were associated with the increased pain perception (P = 0.009 and 0.004, respectively. Preopereative anxiety level was significantly higher among patients who could not complete the ALC procedure (P = 0.018. Conclusion: Correct management of these possible adverse effects results in the increased satisfaction of patients and may encourage this more cost-effective and safe method of laparoscopic cholecystectomy.

  8. Fractional motions

    Energy Technology Data Exchange (ETDEWEB)

    Eliazar, Iddo I., E-mail: eliazar@post.tau.ac.il [Holon Institute of Technology, P.O. Box 305, Holon 58102 (Israel); Shlesinger, Michael F., E-mail: mike.shlesinger@navy.mil [Office of Naval Research, Code 30, 875 N. Randolph St., Arlington, VA 22203 (United States)

    2013-06-10

    Brownian motion is the archetypal model for random transport processes in science and engineering. Brownian motion displays neither wild fluctuations (the “Noah effect”), nor long-range correlations (the “Joseph effect”). The quintessential model for processes displaying the Noah effect is Lévy motion, the quintessential model for processes displaying the Joseph effect is fractional Brownian motion, and the prototypical model for processes displaying both the Noah and Joseph effects is fractional Lévy motion. In this paper we review these four random-motion models–henceforth termed “fractional motions” –via a unified physical setting that is based on Langevin’s equation, the Einstein–Smoluchowski paradigm, and stochastic scaling limits. The unified setting explains the universal macroscopic emergence of fractional motions, and predicts–according to microscopic-level details–which of the four fractional motions will emerge on the macroscopic level. The statistical properties of fractional motions are classified and parametrized by two exponents—a “Noah exponent” governing their fluctuations, and a “Joseph exponent” governing their dispersions and correlations. This self-contained review provides a concise and cohesive introduction to fractional motions.

  9. Reduction of motion artifacts in electrocardiogram monitoring using an optical sensor.

    Science.gov (United States)

    Liu, Yan; Pecht, Michael G

    2011-01-01

    The effectiveness of electrocardiogram (ECG) monitors can be significantly impaired by motion artifacts, which can trigger false alarms, cause misdiagnoses, and lead to inappropriate treatment decisions. Skin stretch associated with patient motion is the most significant source of motion artifacts in current ECG monitoring. In this study, motion artifacts are adaptively filtered by using skin strain as the reference variable, measured noninvasively using an optical sensor incorporated into an ECG electrode. The results demonstrate that this new device and method can significantly reduce motion induced ECG artifacts in continuous ambulatory ECG monitoring.

  10. Motion-capture-based walking simulation of digital human adapted to laser-scanned 3D as-is environments for accessibility evaluation

    Directory of Open Access Journals (Sweden)

    Tsubasa Maruyama

    2016-07-01

    Full Text Available Owing to our rapidly aging society, accessibility evaluation to enhance the ease and safety of access to indoor and outdoor environments for the elderly and disabled is increasing in importance. Accessibility must be assessed not only from the general standard aspect but also in terms of physical and cognitive friendliness for users of different ages, genders, and abilities. Meanwhile, human behavior simulation has been progressing in the areas of crowd behavior analysis and emergency evacuation planning. However, in human behavior simulation, environment models represent only “as-planned” situations. In addition, a pedestrian model cannot generate the detailed articulated movements of various people of different ages and genders in the simulation. Therefore, the final goal of this research was to develop a virtual accessibility evaluation by combining realistic human behavior simulation using a digital human model (DHM with “as-is” environment models. To achieve this goal, we developed an algorithm for generating human-like DHM walking motions, adapting its strides, turning angles, and footprints to laser-scanned 3D as-is environments including slopes and stairs. The DHM motion was generated based only on a motion-capture (MoCap data for flat walking. Our implementation constructed as-is 3D environment models from laser-scanned point clouds of real environments and enabled a DHM to walk autonomously in various environment models. The difference in joint angles between the DHM and MoCap data was evaluated. Demonstrations of our environment modeling and walking simulation in indoor and outdoor environments including corridors, slopes, and stairs are illustrated in this study.

  11. Pediatric ambulatory blood pressure monitoring: indications and interpretations.

    Science.gov (United States)

    Flynn, Joseph T; Urbina, Elaine M

    2012-06-01

    The prevalence of hypertension in children and adolescents is increasing, especially in obese and ethnic children. The adverse long-term effects of hypertension beginning in youth are known; therefore, it is important to identify young patients who need intervention. Unfortunately, measuring blood pressure (BP) is difficult due to the variety of techniques available and innate biologic variation in BP levels. Ambulatory BP monitoring may overcome some of the challenges clinicians face when attempting to categorize a young patient's BP levels. In this article, the authors review the use of ambulatory BP monitoring in pediatrics, discuss interpretation of ambulatory BP monitoring, and discuss gaps in knowledge in usage of this technique in the management of pediatric hypertension.

  12. Abordagem ambulatorial do nutricionista em anemia hemolítica Nutritional ambulatory approach in hemolytic anemia

    Directory of Open Access Journals (Sweden)

    Maria Aparecida Vieira

    1999-04-01

    Full Text Available Descreve a atuação do nutricionista em ambulatório de Hematologia Pediátrica em um hospital escola e relata as condutas dietéticas necessárias na abordagem de crianças com anemia hemolítica com e sem sobrecarga de ferro, e também as atitudes mais freqüentes dos familiares em relação à alimentação desses pacientes.The Authors describe the performance of the Dietitian in a Pediatric Hematology Ambulatory. They emphasize the necessary dietetic procedures for adequate management of children with hemolytic anemia, with and without iron overload. Furthermore, they approach the family's attitude towards the patient's nutrition.

  13. Equine wellness care in ambulatory practice.

    Science.gov (United States)

    Sandoval, Claudia; True, Claudia

    2012-04-01

    Clients want dependable veterinary care and to understand how the services will benefit and meet their horse’s needs. Wellness visits provide ambulatory practitioners with great opportunities to strengthen the doctor-client-patient bond; effective communication with clients during wellness visits, where new literature or facts can be presented, can offer opportunities for demonstrating the value of having the veterinarian maintain a primary role in disease control. The criteria for selecting vaccines, interpreting FECs, and diagnosing dental pathology require the continued need for veterinary involvement. When providing wellness services, veterinarians should discuss those services, the reasons for them, as well as the possibility of adverse reactions. In so doing, the veterinarian is able to clearly distinguish himself or herself from a technician who is merely giving a "shot." Although some of these services can be performed by clients and lay professionals, the knowledge and training that veterinarians bring to these tasks add benefits to the horse beyond the services provided. For example, by targeting treatment and conveying the goals and limitations of FECs and deworming to clients, the speed at which anthelmintic resistance occurs will be diminished, and veterinarians will regain control over equine parasite management. Additional client education, such as demonstrating dental pathology to clients and how veterinary treatment benefits their horse, will not only improve the health of the horse further but also solidify the veterinarian’s role in preventative medicine. While all components of a wellness program were not detailed here, services such as nutritional consultation, blood work, and lameness evaluation should be offered based on the practice’s equine population. With the increasing population of geriatric horses, dentistry, nutrition, blood work, and lameness should be assessed annually or biannually. Each practice has its own set of criteria

  14. Magnetic distortion in motion labs, implications for validating inertial magnetic sensors.

    NARCIS (Netherlands)

    Vries, W.H. de; Veeger, H.E.; Baten, C.T.; Helm, F.C.T. van der

    2009-01-01

    BACKGROUND: Ambulatory 3D orientation estimation with Inertial Magnetic Sensor Units (IMU's) use the earth magnetic field. The magnitude of distortion in orientation in a standard equipped motion lab and its effect on the accuracy of the orientation estimation with IMU's is addressed. METHODS: Orien

  15. Prevalência de papilomavirus humano (HPV anal, genital e oral, em ambulatório geral de coloproctologia Prevalence of anal, genital and oral human papillomavirus (HPV in general ambulatory for diseases of colon and rectum

    Directory of Open Access Journals (Sweden)

    João Carlos Magi

    2006-09-01

    Full Text Available O Papilomavirus Humano (HPV anal tem alta prevalência e incidência na população. O objetivo deste trabalho é verificar a prevalência de HPV anal, bucal e genital em ambulatório público de Coloproctologia, com base no exame de captura hibrida. Foram estudados 64 pacientes atendidos no ambulatório geral de Coloproctologia do Hospital Heliópolis, no período de 22/11/2005 a 20/12/2005, onde foram levantados, de forma prospectiva, dados clínicos, pessoais e comportamentais, identificando o perfil do grupo como não sendo de risco para HPV. Nenhum paciente deste grupo veio à consulta com queixa ou apresentando sinais de HPV ou outra doença sexualmente transmissível. Foram colhidos para cada paciente um esfregaço com escova de boca, outro de vulva/pênis e outro do ânus. O resultado mostrou que 15,62% dos pacientes apresentaram HPV anal, bucal ou genital, sendo que 4,68% do total de pacientes apresentavam HPV anal, um paciente de alto risco associado ao HPV genital, outro misto e outro de baixo risco. Trinta por cento dos pacientes HPV+ apresentavam dor anal como queixa principal. A conclusão é que a prevalência de HPV anal, genital e bucal é elevada, sendo que 4,68% apresentavam HPV anal e daqueles HPV positivos 30% apresentavam dor anal na queixa principal.Anal Human Papilomavirus (HPV has a high prevalence and incidence in the population. The purpose of this project is to verify the prevalence of anal, oral and genital HPV at the Coloproctology Clinic, based on the hybrid capture exam. Sixty four patients were assisted at the clinic from November 22nd to December 20th 2005. Clinical, personal and behavioral data of the patients were set up in a prospective way. The group profile was identified as not being a risky one to HPV. No patient of this group, when was assisted, had complained of or had presented any symptoms of HPV or any other sexually transmitted disease (STD. From each patient it was collected a mouth sample, a vulva

  16. Reproducibility of the ambulatory arterial stiffness index in hypertensive patients

    DEFF Research Database (Denmark)

    Dechering, D.G.; Steen, M.S. van der; Adiyaman, A.;

    2008-01-01

    BACKGROUND: We studied the repeatability of the ambulatory arterial stiffness index (AASI), which can be computed from 24-h blood pressure (BP) recordings as unity minus the regression slope of diastolic on systolic BP. METHODS: One hundred and fifty-two hypertensive outpatients recruited...

  17. Screening for Pediatric Obstructive Sleep Apnea before Ambulatory Surgery

    Science.gov (United States)

    Ishman, Stacey L.; Tawfik, Kareem O.; Smith, David F.; Cheung, Kristin; Pringle, Lauren M.; Stephen, Matthew J.; Everett, Tiffany L.; Stierer, Tracey L.

    2015-01-01

    Purpose: The American Society of Anesthesia practice guidelines recommend that pediatric and adult patients who undergo ambulatory surgery be screened for obstructive sleep apnea (OSA). With this in mind, our objective was to assess the frequency of screening by anesthesia providers for the signs and symptoms of OSA in children undergoing surgery in an ambulatory setting. Methods: Prospective single-blinded observational study of anesthesia providers' preoperative interview of caregivers of consecutive patients younger than age 18 who were scheduled for ambulatory surgery. Results: One hundred one children (30 females) were identified, with a mean age of 6.9 ± 5.0 years; 54 were classified as white, 33 as black, and 14 as other. Total OSA-18 scores ranged from 18 to 97, with a mean of 33.1 ± 14.8. The mean score for adenotonsillectomy patients was higher than that for children who underwent procedures other than adenotonsillectomy. Thirty-one percent of children were screened for OSA, and snoring was the most common symptom recorded (28%). Patients who were screened for OSA were more likely to have snoring (p Tawfik KO, Smith DF, Cheung K, Pringle LM, Stephen MJ, Everett TL, Stierer TL. Screening for pediatric obstructive sleep apnea before ambulatory surgery. J Clin Sleep Med 2015;11(7):751–755. PMID:25902820

  18. Using an Empirical Model of Human Turning Motion to Aid Heading Estimation in a Personal Navigation System

    Science.gov (United States)

    Jakel, Thomas

    With the adoption of Global Navigation Satellite Systems in smart phones, soldier equipment, and emergency responder navigation systems users have realized the usefulness of low cost Personal Navigation Systems. The state-of-the-art Personal Navigation System is a unit that fuses information based on external references with a low cost IMU. Due to the size, weight, power, and cost constraints imposed on a pedestrian navigation systems as well as current IMU performance limitations, the gyroscopes used to determine heading exhibit significant drift limiting the performance of the navigation system. In this thesis biomechanical signals are used to predict the onset of pedestrian turning motion. Experimental data from eight subjects captured in a gait laboratory using a Vicon motion tracking unit is used for validation. The analysis of experimental data shows the heading computed by turn prediction augmented integration is more accurate than open loop gyro integration alone.

  19. On using the Microsoft Kinect$^{\\rm TM}$ sensors to determine the lengths of the arm and leg bones of a human subject in motion

    CERN Document Server

    Malinowski, M J

    2015-01-01

    The present study is part of a broader programme, exploring the possibility of involving the Microsoft Kinect$^{\\rm TM}$ sensor in the analysis of human motion. We examine the output obtained from the two available versions of this sensor in relation to the variability of the estimates of the lengths of eight bones belonging to the subject's extremities: of the humerus (upper arm), ulna (lower arm, forearm), femur (upper leg), and tibia (lower leg, shank). Large systematic effects in the output of the two sensors have been observed.

  20. [A new human machine interface in neurosurgery: The Leap Motion(®). Technical note regarding a new touchless interface].

    Science.gov (United States)

    Di Tommaso, L; Aubry, S; Godard, J; Katranji, H; Pauchot, J

    2016-06-01

    Currently, cross-sectional imaging viewing is used in routine practice whereas the surgical procedure requires physical contact with an interface (mouse or touch-sensitive screen). This type of contact results in a risk of lack of aseptic control and causes loss of time. The recent appearance of devices such as the Leap Motion(®) (Leap Motion society, San Francisco, USA) a sensor which enables to interact with the computer without any physical contact is of major interest in the field of surgery. However, its configuration and ergonomics produce key challenges in order to adapt to the practitioner's requirements, the imaging software as well as the surgical environment. This article aims to suggest an easy configuration of the Leap Motion(®) in neurosurgery on a PC for an optimized utilization with Carestream(®) Vue PACS v11.3.4 (Carestream Health, Inc., Rochester, USA) using a plug-in (to download at: https://drive.google.com/?usp=chrome_app#folders/0B_F4eBeBQc3ybElEeEhqME5DQkU) and a video tutorial (https://www.youtube.com/watch?v=yVPTgxg-SIk).

  1. The ten successful elements of an ambulatory care center.

    Science.gov (United States)

    Watkins, G

    1997-01-01

    Experts in healthcare predict that in the future, over 80% of all care will be provided either in the home or ambulatory care centers. How radiology facilities position themselves for this shifting market is critical to their long-term success, even though it appears there are endless opportunities for providing care in this atmosphere. The ten most critical elements that healthcare providers must address to ensure their preparedness are discussed. Location is critical, particularly since patients no longer want to travel to regional medical centers. The most aggressive providers are building local care centers to serve specific populations. Ambulatory care centers should project a high tech, high touch atmosphere. Patient comfort and the appeal of the overall environment must be considered. Centers need to focus on their customers' needs in multiple areas of care. A quick and easy registration process, providing dressing gowns in patient areas, clear billing functions--these are all important areas that centers should develop. Physicians practicing in the ambulatory care center are key to its overall success and can set the tone for all staff members. Staff members must be friendly and professional in their work with patients. The hours offered by the center must meet the needs of its client base, perhaps by offering evening and weekend appointments. Keeping appointments on schedule is critical if a center wants satisfied customers. It's important to identify the target before developing your marketing plan. Where do your referrals come from? Look to such sources as referring physicians, managed care plans and patients themselves. Careful billing is critical for survival in the ambulatory care world. Costs are important and systems that can track cost per exam are useful. Know your bottom line. Service remains the central focus of all successful ambulatory care center functions.

  2. Pharmacological treatment of ambulatory schizophrenic patients in Belgium

    Directory of Open Access Journals (Sweden)

    Reginster J-Y

    2006-05-01

    Full Text Available Abstract Background the objective of this study was twofold: 1 Describe the use of antipsychotic treatments in ambulatory patients suffering from schizophrenia in Belgium. 2 Evaluate to which extend antipsychotic treatment prescribing patterns are in accordance with published treatment guidelines. Method A cross-sectional survey was carried out in 16 Belgian hospitals selected from a sample of 67 hospitals. The hospitals were equally distributed between the north and south part of the country and were representative of Belgian practice. During 2 months, participating psychiatrists were asked to record the medication use as well as demographic parameters of all consecutive ambulatory patients seen at their consultation or attending a day-hospital. Data concerning 1000 ambulatory patients with schizophrenia or schizoaffective disorder were collected. Results In Belgium, the use of atypical antipsychotics is frequent (69% in ambulatory patients with schizophrenia. In the overall sample, 73% receive only one antipsychotic drug. The majority of patients are treated with drugs of only one antipsychotic drug group, either first- typical (29.8% or second-generation, atypical antipsychotics (53.2%. 15.8% of patients combine different types of antipsychotics. Antipsychotic dosing is adequate for the majority of patients but about one fifth receives a higher than recommended dose as per package inserts. Polypharmacy remains within reasonable limits. The use of concomitant medication varies according the antipsychotic treatment: patients who take second-generation antipsychotics only, receive the least additional drugs. Conclusion Atypical antipsychotics appear to be the first line treatment for schizophrenic psychosis. Psychiatrists working with ambulatory patients are well aware of treatment guidelines and follow them quite adequately.

  3. Characteristics of ambulatory anticoagulant adverse drug events: a descriptive study

    Directory of Open Access Journals (Sweden)

    Eckstrand Julie

    2010-02-01

    Full Text Available Abstract Background Despite the high frequency with which adverse drug events (ADEs occur in outpatient settings, detailed information regarding these events remains limited. Anticoagulant drugs are associated with increased safety concerns and are commonly involved in outpatient ADEs. We therefore sought to evaluate ambulatory anticoagulation ADEs and the patient population in which they occurred within the Duke University Health System (Durham, NC, USA. Methods A retrospective chart review of ambulatory warfarin-related ADEs was conducted. An automated trigger surveillance system identified eligible events in ambulatory patients admitted with an International Normalized Ratio (INR >3 and administration of vitamin K. Event and patient characteristics were evaluated, and quality/process improvement strategies for ambulatory anticoagulation management are described. Results A total of 169 events in 167 patients were identified from December 1, 2006-June 30, 2008 and included in the study. A median supratherapeutic INR of 6.1 was noted, and roughly half of all events (52.1% were associated with a bleed. Nearly 74% of events resulted in a need for fresh frozen plasma; 64.8% of bleeds were classified as major. A total of 59.2% of events were at least partially responsible for hospital admission. Median patient age was 68 y (range 36-95 y with 24.9% initiating therapy within 3 months prior to the event. Of events with a prior documented patient visit (n = 157, 73.2% were seen at a Duke clinic or hospital within the previous month. Almost 80% of these patients had anticoagulation therapy addressed, but only 60.0% had a follow-up plan documented in the electronic note. Conclusions Ambulatory warfarin-related ADEs have significant patient and healthcare utilization consequences in the form of bleeding events and associated hospital admissions. Recommendations for improvement in anticoagulation management include use of information technology to assist

  4. Management of comorbidities in ambulatory anesthesia: a review

    Directory of Open Access Journals (Sweden)

    Dabu-Bondoc S

    2015-06-01

    Full Text Available Susan Dabu-Bondoc, Kirk Shelley Department of Anesthesiology, School of Medicine, Yale University, New Haven, CT, USAAbstract: Advances in medical science now allow people with significant medical issues to live at home. As the outpatient population ages and surgical techniques advance, the ambulatory anesthesiologist has to be prepared to handle these “walking wounded”. The days of restricting ambulatory surgery procedures to American Society of Anesthesiologists class 1 and 2 patients are rapidly fading into the past. To remain competitive and economically viable, the modern ambulatory surgery center needs to expand its practice to include patients with medical comorbidities. In an environment where production and economic pressures exist, maintaining safety and good outcomes in high-risk patients for ambulatory surgery can be arduous. Adding to the complexity of this challenge is the rapid evolution of the therapeutic approaches to a variety of medical issues. For example, there has been a significant increase in the number and types of insulin a diabetic patient might be prescribed in recent years. In the case of the patient with coronary artery disease, the variety of both drug and nondrug eluding stents or new antithrombotic agents has also increased the complexity of perioperative management. Complex patients need careful, timely, and team-based preoperative evaluation by an anesthesia provider who is knowledgeable of outpatient care. Optimizing comorbidities preoperatively is a crucial initial step in minimizing risk. This paper will examine a number of common medical issues and explore their impact on managing outpatient surgical procedures.Keywords: ambulatory surgery, medical comorbidities, diabetes, coronary artery disease, respiratory disease, obesity

  5. A Visual Perception Algorithm for Human Motion by a Kinect%利用Kinect的人体动作视觉感知算法

    Institute of Scientific and Technical Information of China (English)

    朱特浩; 赵群飞; 夏泽洋

    2014-01-01

    A visual perception algorithm of human motion for humanoid robot is proposed to improve the precision of the motion data captured from a Kinect. Firstly, the positions of the joints are transformed into the angles according to the inverse kinematics equations. Secondly, the long-time motion is segmented into episodes automatically based on the change of the angular velocity and acceleration, and then RVM (relevant vector machine) is utilized for estimating the angle trajectories with high accuracy. Finally, the spatial consistence, temporal consistence and smoothness of the angle trajectories are given to evaluate the algorithm, and a motion data series processed by the algorithm is implemented on a NAO robot platform. The experimental results indicate that the proposed algorithm effectively improves the spatial and temporal consistence of the motion perception and the smoothness of the trajectory, which provides a foundation for high-precision motion imitation.%提出了一种面向类人机器人的人体动作视觉感知算法,提高了利用Kinect作为视觉输入设备捕捉到的人体动作数据的精度。首先,通过逆运动学方程将捕捉到的关节位移信息转换成角度信息。然后,以角速度和角加速度的变化为依据,将长时间的运动自动分割成独立片段,并用相关向量机原理估计出高精度的角度轨迹。最后,用角度轨迹的空间相似性、时间相似性、平滑度等指标对该算法进行了评估,并在NAO机器人平台上对算法处理后的动作进行了实验验证。实验结果表明,该算法有效提高了动作感知的时空相似性和轨迹平滑度,为高精度的动作模仿奠定了基础。

  6. 基于RFID概率泛函的人体运动受力行为分解%Human Motion Mechanical Behavior Decomposition Based on RFID Probability Functional

    Institute of Scientific and Technical Information of China (English)

    骆勇

    2015-01-01

    In the process human sports training, the human motion force decomposition modeling is used for analyzing the characteristics of split force in quantitative, and it can provides the base of human force action recognition with multi sensor information fusion. In the traditional method, the entropy clustering functional analysis method is used for human motor neuron stress behavior analysis, but it cannot achieve the simulation and analysis of missing force data in complex motion state. An improved human motion force behavior decomposition method is proposed based on RFID missing data probabili⁃ty functional. The acceleration sensor is combined with RFID. The missing data probability functional algorithm is used for perception of the movement joint node stress behavior decomposition, and the different sensor output signal correlation characteristics are extracted. The improved decomposition algorithm and the model of human body motion characteristic be⁃havior is completed. The experimental results show that the model can accurately capture to the exercise stress data of body with upper body and lower limbs. Force behavior decomposition is accurate and concrete. The quantitative description of stress characteristics of human body in motion model is obtained, so as to guide the movement training, so it has good appli⁃cation value.%对人体体育运动训练过程中的受力行为进行分解建模,可以定量分析人体受力特征,为实现多传感器信息融合的运动受力行为识别奠定基础。传统方法中采用熵聚类泛函的人体运动神经元受力行为分析方法,无法实现对复杂运动状态下的人体受力缺失数据的模拟和分析。提出一种基于RFID缺失数据概率泛函的人体运动受力行为分解,将加速度传感器与RFID结合,采用缺失数据概率泛函算法对感知的运动关节节点进行受力行为分解,提取了不同传感器节点输出信号关联特征,实现对人体

  7. Determining resource intensity weights in ambulatory chemotherapy related to nursing workload.

    Science.gov (United States)

    Green, Esther; Preyra, Colin; Stewart, Janice; McLennan, Cindy; Bland, Rosemary; Dus, Tamara; Langhorn, Marcia; Beattie, Kathy; Cheung, Annie; Hertz, Sherrie; Sechter, Haim; Burns, Judy; Angus, Helen; Sawka, Carol

    2012-01-01

    Ontario cancer programs aim to deliver high-quality nursing care and treatment that is safe for patients and staff. The reality of health care is that financial constraints, inherent in the delivery of care, require that funding mechanisms count not only the cost of drugs, but factors such as pharmacy and nursing human resource costs. While some organizations have developed patient classification systems to measure nursing intensity and workload, these systems apply primarily to inpatient populations, and are fraught with numerous challenges, such as the need for nurses to document to justify the workload required for care. The purpose of this paper is to outline the methodology and engagement of nurses to develop regimen-based resource intensity weights that can be applied to ambulatory chemotherapy suites. The methodology included determination of workload related to nursing time to prepare, teach, counsel and assess patients, as well as time to gather supplies, access lines, monitor, manage adverse reactions, manage symptoms and document care. Resource intensity weights provide better measures of the complexity of care required by cancer patients in ambulatory settings.

  8. Modal-Power-Based Haptic Motion Recognition

    Science.gov (United States)

    Kasahara, Yusuke; Shimono, Tomoyuki; Kuwahara, Hiroaki; Sato, Masataka; Ohnishi, Kouhei

    Motion recognition based on sensory information is important for providing assistance to human using robots. Several studies have been carried out on motion recognition based on image information. However, in the motion of humans contact with an object can not be evaluated precisely by image-based recognition. This is because the considering force information is very important for describing contact motion. In this paper, a modal-power-based haptic motion recognition is proposed; modal power is considered to reveal information on both position and force. Modal power is considered to be one of the defining features of human motion. A motion recognition algorithm based on linear discriminant analysis is proposed to distinguish between similar motions. Haptic information is extracted using a bilateral master-slave system. Then, the observed motion is decomposed in terms of primitive functions in a modal space. The experimental results show the effectiveness of the proposed method.

  9. 基于视觉的人体运动分析综述%A Survey of Vision-Based Human Motion Analysis

    Institute of Scientific and Technical Information of China (English)

    阮涛涛; 姚明海; 瞿心昱; 楼中望

    2011-01-01

    Vision-based human motion analysis is receiving increasing attention from computer vision researchers.It becomes the hotspot of the field of image analysis, psychology and artificial intelligence.It has a wide application in intelligent video surveillance, virtual reality, user interfaces and motion analysis.In this paper, moving target detection,classification, tracking and human action recognition are overviewed.We analyze some problems and challenges.Finally, some research directions in the future are discussed.%基于视觉的人运动分析越来越受到计算机视觉领域研究者的广泛关注,它成为图像分析、心理学、人工智能等领域的研究热点,在智能视频监控、虚拟现实、用户接口、运动分析等方面有着广泛的应用.从运动目标检测、运动目标分类、人体运动跟踪、人体行为识别与描述四个环节综述了人体运动分析的研究现状,分析了存在的一些问题和未来的研究发展方向.

  10. Automated ambulatory assessment of cognitive performance, environmental conditions, and motor activity during military operations

    Science.gov (United States)

    Lieberman, Harris R.; Kramer, F. Matthew; Montain, Scott J.; Niro, Philip; Young, Andrew J.

    2005-05-01

    Until recently scientists had limited opportunities to study human cognitive performance in non-laboratory, fully ambulatory situations. Recently, advances in technology have made it possible to extend behavioral assessment to the field environment. One of the first devices to measure human behavior in the field was the wrist-worn actigraph. This device, now widely employed, can acquire minute-by-minute information on an individual"s level of motor activity. Actigraphs can, with reasonable accuracy, distinguish sleep from waking, the most critical and basic aspect of human behavior. However, rapid technologic advances have provided the opportunity to collect much more information from fully ambulatory humans. Our laboratory has developed a series of wrist-worn devices, which are not much larger then a watch, which can assess simple and choice reaction time, vigilance and memory. In addition, the devices can concurrently assess motor activity with much greater temporal resolution then the standard actigraph. Furthermore, they continuously monitor multiple environmental variables including temperature, humidity, sound and light. We have employed these monitors during training and simulated military operations to collect information that would typically be unavailable under such circumstances. In this paper we will describe various versions of the vigilance monitor and how each successive version extended the capabilities of the device. Samples of data from several studies are presented, included studies conducted in harsh field environments during simulated infantry assaults, a Marine Corps Officer training course and mechanized infantry (Stryker) operations. The monitors have been useful for documenting environmental conditions experienced by wearers, studying patterns of sleep and activity and examining the effects of nutritional manipulations on warfighter performance.

  11. Ambulatory Surgical Center (ASC) Payment System

    Data.gov (United States)

    U.S. Department of Health & Human Services — This file contains a summary of service utilization by ASC supplier and is derived from 2011 ASC line item level data, updated through June 2012, that is, line items...

  12. Ambulatory Surgical Center (ASC) Payment System

    Data.gov (United States)

    U.S. Department of Health & Human Services — This file contains a summary of service utilization by ASC supplier and is derived from 2011 ASC line item level data, updated through June 2012, that is, line...

  13. Cognitive assessment on elderly people under ambulatory care

    Directory of Open Access Journals (Sweden)

    Bruna Zortea

    2015-04-01

    Full Text Available Objective: to evaluate the cognitive state of elderly people under ambulatory care and investigating the connection between such cognitive state and sociodemographic variables, health conditions, number of and adhesion to medicine. Methods: transversal, exploratory, and descriptive study, with a quantitative approach, realized with 107 elderly people under ambulatory care in a university hospital in southern Brazil, in november, 2013. The following variables were used: gender, age, civil status, income, schooling, occupation, preexisting noncommunicable diseases, number and type of prescribed medications, adhesion, mini-mental state examination score, and cognitive status. Data was analyzed through inferential and descriptive statistics. Results: the prevalence of cognitive deficit was of 42.1% and had a statistically significant connection to schooling, income, civil status, hypertension, and cardiopathy. Conclusion: nurses can intervene to avoid the increase of cognitive deficit through an assessment of the elderly person, directed to facilitative strategies to soften this deficit.

  14. [The ambulatory polyclinic institutions in closed administrative territorial municipality].

    Science.gov (United States)

    Fomin, E P

    2014-01-01

    The article presents the results characterizing functioning of ambulatory polyclinic institutions included into medical sanitary unit of closed administrative territorial municipality of lesser towns. The study established the resource support of staff and full-time positions of physician and paramedical personnel, dynamics of indicators from 2005 to 2013, coverage of population of able-bodied age with preventive and target medical examinations for syphilis and tuberculosis. The progression of contingents under dispensary registration was determined.

  15. Pathway to Best Practice in Spirometry in the Ambulatory Setting.

    Science.gov (United States)

    Peracchio, Carol

    2016-01-01

    Spirometry performed in the ambulatory setting is an invaluable tool for diagnosis, monitoring, and evaluation of respiratory health in patients with chronic lung disease. If spirometry is not performed according to American Thoracic Society (ATS) guidelines, unnecessary repeated testing, increased expenditure of time and money, and increased patient and family anxiety may result. Two respiratory therapists at Mission Health System in Asheville, NC, identified an increase in patients arriving at the pulmonary function testing (PFT) laboratories with abnormal spirometry results obtained in the ambulatory setting. These abnormal results were due to incorrect testing procedure, not chronic lung disease. Three training methods were developed to increase knowledge of correct spirometry testing procedure in the ambulatory setting. The therapists also created a plan to educate offices that do not perform spirometry on the importance and availability of PFT services at our hospital for the population of patients with chronic lung disease. Notable improvements in posttraining test results were demonstrated. The education process was evaluated by a leading respiratory expert, with improvements suggested and implemented. Next steps are listed.

  16. Role of ambulatory blood pressure monitoring in resistant hypertension.

    Science.gov (United States)

    Grassi, Guido; Bombelli, Michele; Seravalle, Gino; Brambilla, Gianmaria; Dell'oro, Raffaella; Mancia, Giuseppe

    2013-06-01

    Ambulatory blood pressure monitoring has gained growing popularity in the diagnosis and treatment of essential hypertension for several reasons, such as the lack of the so-called white-coat effect, the greater reproducibility as compared with clinic blood pressure, the ability to provide information on blood pressure phenomena of prognostic value and the closer relationship with the risk of cardiovascular morbidity and mortality. All the above-mentioned main features of ambulatory blood pressure monitoring are also true for resistant hypertension. In addition, however, in resistant hypertension, blood pressure monitoring allows one to precisely define the diagnosis of this clinical condition, by excluding the presence of white-coat hypertension, which is responsible for a consistent number of "false" resistant hypertensive cases. The approach also allows one to define the patterns of blood pressure variability in this clinical condition, as well as its relationships with target organ damage. Finally, it allows one to assess the effects of therapeutic interventions, such as renal nerves ablation, aimed at improving blood pressure control in this hypertensive state. The present paper will critically review the main features of ambulatory blood pressure monitoring in resistant hypertension, with particular emphasis on the diagnosis and treatment of this high-risk hypertensive state.

  17. A vision for ambulatory care in the 21st century.

    Science.gov (United States)

    Zuckerman, A M

    1998-01-01

    The 1990's have been a remarkable decade for ambulatory care providers. Ambulatory care services have flourished in an era of rapidly increasing demands and seemingly limitless potential. Will the first decade of the next millennium continue this trend or is something new on the horizon? Ambulatory care's future prospects need to be evaluated within the context of the overall health care delivery environment of the future. At this time, three alternative "futures" seem plausible for the next decade. Managed care dominates. This scenario appears most likely at present with managed care poised to make significant inroads into Medicaid and Medicare populations. National health insurance is instituted. Some believe that this is a logical reaction to the excesses of the current competitive marketplace and is possible following the presidential election of 2004. Slow evolution of current system. This scenario may be viewed as the status quo alternative and is likely in the absence of a crisis or a better, generally agreed upon way in which to improve health care delivery.

  18. Ambulatory Melanoma Care Patterns in the United States

    Directory of Open Access Journals (Sweden)

    Andrew L. Ji

    2013-01-01

    Full Text Available Objective. To examine trends in melanoma visits in the ambulatory care setting. Methods. Data from the National Ambulatory Medical Care Survey (NAMCS from 1979 to 2010 were used to analyze melanoma visit characteristics including number of visits, age and gender of patients, and physician specialty. These data were compared to US Census population estimates during the same time period. Results. The overall rate of melanoma visits increased ( at an apparently higher rate than the increase in population over this time. The age of patients with melanoma visits increased at approximately double the rate (0.47 year per interval year, of the population increase in age (0.23 year per interval year. There was a nonsignificant decline in the proportion of female patients seen over the study interval. Lastly, ambulatory care has shifted towards dermatologists and other specialties managing melanoma patients and away from family/internal medicine physicians and general/plastic surgeons. Conclusions. The number and age of melanoma visits has increased over time with respect to the overall population, mirroring the increase in melanoma incidence over the past three decades. These trends highlight the need for further studies regarding melanoma management efficiency.

  19. Annotated Bibliography: Understanding Ambulatory Care Practices in the Context of Patient Safety and Quality Improvement.

    Science.gov (United States)

    Montano, Maria F; Mehdi, Harshal; Nash, David B

    2016-11-01

    The ambulatory care setting is an increasingly important component of the patient safety conversation. Inpatient safety is the primary focus of the vast majority of safety research and interventions, but the ambulatory setting is actually where most medical care is administered. Recent attention has shifted toward examining ambulatory care in order to implement better health care quality and safety practices. This annotated bibliography was created to analyze and augment the current literature on ambulatory care practices with regard to patient safety and quality improvement. By providing a thorough examination of current practices, potential improvement strategies in ambulatory care health care settings can be suggested. A better understanding of the myriad factors that influence delivery of patient care will catalyze future health care system development and implementation in the ambulatory setting.

  20. Soccer athletes are superior to non-athletes at perceiving soccer-specific and non-sport specific human biological motion

    Directory of Open Access Journals (Sweden)

    Thomas eRomeas

    2015-09-01

    Full Text Available Recent studies have shown that athletes’ domain specific perceptual-cognitive expertise can transfer to everyday tasks. Here we assessed the perceptual-cognitive expertise of athletes and non-athletes using sport specific and non-sport specific biological motion perception tasks. Using a virtual environment, university-level soccer players and university students’ non-athletes were asked to perceive the direction of a point-light walker and to predict the trajectory of a masked-ball during a point-light soccer kick. Angles of presentation were varied for orientation (upright, inverted and distance (2m, 4m, 16m. Accuracy and reaction time were measured to assess observers’ performance. The results highlighted athletes’ superior ability compared to non-athletes to accurately predict the trajectory of a masked soccer ball presented at 2m (reaction time, 4m (accuracy and reaction time and 16m (accuracy of distance. More interestingly, experts also displayed greater performance compared to non-athletes throughout the more fundamental and general point-light walker direction task presented at 2m (reaction time, 4m (accuracy and reaction time and 16m (reaction time of distance. In addition, athletes showed a better performance throughout inverted conditions in the walker (reaction time and soccer kick (accuracy and reaction time tasks. This implies that during human biological motion perception, athletes demonstrate an advantage for recognizing body kinematics that goes beyond sport specific actions.

  1. Ambulatory activity monitoring: Progress in measurement of activity, posture, and specific motion patterns in daily life

    NARCIS (Netherlands)

    J.B.J. Bussmann (Hans); U.W. Ebner-Priemer (Ulrich); J. Fahrenberg (Jochen)

    2009-01-01

    textabstractBehavior is central to psychology in almost any definition. Although observable activity is a core aspect of behavior, assessment strategies have tended to focus on emotional, cognitive, or physiological responses. When physical activity is assessed, it is done so mostly with questionnai

  2. Ambulatory Research and Education Center Oregon Health Science University. Environmental Assesment

    Energy Technology Data Exchange (ETDEWEB)

    1994-03-21

    DOE has prepared an Environmental Assessment (EA) (DOE/EA-0921) evaluating the proposed construction and operation of the Ambulatory Research and Education Center (AREC), which would be located on the top seven floors of the existing NeuroSensory Research Center (NRC) on the campus of the Oregon Health Sciences University (OHSU) at Portland, Oregon. The proposed action would combine activities scattered across the campus into a central facility. Based on the analysis in the EA, DOE has determined that the proposed action does not constitute a major Federal action significantly affecting the quality of the human environment within the meaning of the National Environmental Policy Act (NEPA) of 1969, 42 USC 4321 et seq. Therefore, an environmental impact statement (EIS) is not required and the Department is issuing this Finding of No Significant Impact (FONSI).

  3. Motion analysis report

    Science.gov (United States)

    Badler, N. I.

    1985-01-01

    Human motion analysis is the task of converting actual human movements into computer readable data. Such movement information may be obtained though active or passive sensing methods. Active methods include physical measuring devices such as goniometers on joints of the body, force plates, and manually operated sensors such as a Cybex dynamometer. Passive sensing de-couples the position measuring device from actual human contact. Passive sensors include Selspot scanning systems (since there is no mechanical connection between the subject's attached LEDs and the infrared sensing cameras), sonic (spark-based) three-dimensional digitizers, Polhemus six-dimensional tracking systems, and image processing systems based on multiple views and photogrammetric calculations.

  4. Methods for Motion Correction Evaluation Using 18F-FDG Human Brain Scans on a High-Resolution PET Scanner

    DEFF Research Database (Denmark)

    Keller, Sune H.; Sibomana, Merence; Olesen, Oline Vinter;

    2012-01-01

    Many authors have reported the importance of motion correction (MC) for PET. Patient motion during scanning disturbs kinetic analysis and degrades resolution. In addition, using misaligned transmission for attenuation and scatter correction may produce regional quantification bias in the reconstr...

  5. Induction of sexual arousal in women under conditions of institutional and ambulatory laboratory circumstances: a comparative study

    NARCIS (Netherlands)

    J. Bloemers; J. Gerritsen; R. Bults; H. Koppeschaar; W. Everaerd; B. Olivier; A. Tuiten

    2010-01-01

    Introduction. Measuring under naturally occurring circumstances increases ecological validity. We developed an ambulatory psychophysiological laboratory that allows experiments to be performed at home. Aims.  To compare institutional laboratory task measures with ambulatory laboratory task measures.

  6. Educating Asthmatic Children in European Ambulatory Pediatrics: Facts and Insights.

    Science.gov (United States)

    Robberecht, Marie Noëlle; Beghin, Laurent; Deschildre, Antoine; Hue, Valérie; Reali, Laura; Plevnik-Vodušek, Vesna; Moretto, Marilena; Agustsson, Sigurlaug; Tockert, Emile; Jäger-Roman, Elke; Deplanque, Dominique; Najaf-Zadeh, Abolfazl; Martinot, Alain

    2015-01-01

    The aim of this study was to assess the role of European ambulatory pediatricians in caring for asthmatic children, especially in terms of their therapeutic education. We developed a survey that was observational, declarative, retrospective and anonymous in nature. 436 ambulatory pediatricians in Belgium, France, Germany, Italy, Luxembourg and Slovenia were asked to participate in the survey providing information on three children over 6 years old suffering from persistent asthma, who had been followed for at least 6 months. We considered the pediatricians' profile, and their role in the therapeutic education of children. 277 pediatricians (64%) responded: 81% were primary care pediatricians; 46% participated in networks; 4% had specific training in Therapeutic Patient Education; 69% followed more than 5 asthmatic children per month, and over long periods (7 ± 4 years). The profiles of 684 children were assessed. Answers diverged concerning the provision of a Personalized Action Plan (60-88%), training the child to measure and interpret his Peak Expiratory Flow (31-99%), and the prescription of pulmonary function tests during the follow-up programme of consultations (62-97%). Answers converged on pediatricians' perception of their role in teaching children about their condition and its treatment (99%), about inhalation techniques (96%), and in improving the children's ability to take preventive measures when faced with risk situations (97%). This study highlights the role of European pediatricians in caring for asthmatic children, and their lack of training in Therapeutic Patient Education. Programmes and tools are required in order to train ambulatory pediatricians in Therapeutic Patient Education, and such resources should be integrated into primary health care, and harmonized at the European level.

  7. Strategies to reduce medication errors in pediatric ambulatory settings

    Directory of Open Access Journals (Sweden)

    S Mehndiratta

    2012-01-01

    Full Text Available Worldwide, a large number of children are prescribed drugs on an outpatient basis. Medication errors are fairly common in these settings. Though this matter has been well recognized as a cause of concern, limited data is available from ambulatory settings. Medication errors can be defined as errors that may occur at any step, starting from ordering a medication, to dispensing, administration of the drug and the subsequent monitoring. The outcomes of such errors are variable and may range between those that are clinically insignificant to a life-threatening event. The reasons for these medication errors are multi-factorial. Children are unable to administer medications to themselves and also require a strict weight-based dosing regimen. The risk factors associated with medication errors include complex regimens with multiple medications. Overdosing and under-dosing (10-fold calculation errors, an increased or a decreased frequency of dosing or an inappropriate duration of administration of the medication, are frequently detected errors. The lack of availability of proper formulations adds to the confusion. The low level of literacy among the caregivers can aggravate this problem. There is a lack of proper reporting and monitoring mechanisms in most ambulatory settings, hence these errors remain unrecognized and often go unreported. This article summarizes the current available literature on medication errors in ambulatory settings and the possible strategies that can be adopted to reduce the burden of these errors in order to improve child care and patient safety. Voluntary, anonymous reporting can be introduced in the healthcare institutions to determine the incidence of these errors.

  8. Ambulatory surgery with chloroprocaine spinal anesthesia: a review

    Directory of Open Access Journals (Sweden)

    Ghisi D

    2015-11-01

    Full Text Available Daniela Ghisi, Stefano Bonarelli Department of Anaesthesia and Postoperative Intensive Care, Istituto Ortopedico Rizzoli, Bologna, Italy Abstract: Spinal anesthesia is a reliable and safe technique for procedures of the lower extremities. Nevertheless, some of its characteristics may limit its use for ambulatory surgery, including delayed ambulation, risk of urinary retention, and pain after block regression. The current availability of short-acting local anesthetics has renewed interest for this technique also in the context of short- and ultra-short procedures. Chloroprocaine (CP is an amino-ester local anesthetic with a very short half-life. It was introduced and has been successfully used for spinal anesthesia since 1952. Sodium bisulfite was then added as a preservative after 1956. The drug was then abandoned in the 1980s for several reports of neurological deficits in patients receiving accidentally high doses of intrathecal CP during epidural labor analgesia. Animal studies have proven the safety of the preservative-free formulation, which has been extensively evaluated in volunteer studies as well as in clinical practice with a favorable profile in terms of both safety and efficacy. In comparison with bupivacaine, 2-chloroprocaine (2-CP showed faster offset times to end of anesthesia, unassisted ambulation, and discharge from hospital. These findings suggests that 2-CP may be a suitable alternative to low doses of long-acting local anesthetics in ambulatory surgery. Its safety profile also suggests that 2-CP could be a valid substitute for intrathecal short- and intermediate-acting local anesthetics, such as lidocaine and mepivacaine – often causes of transient neurological symptoms. In this context, literature suggests a dose ranging between 30 and 60 mg of 2-CP for procedures lasting 60 minutes or less, while 10 mg is considered the no-effect dose. The present review describes recent evidence about 2-CP as an anesthetic agent for

  9. Regional variations in ambulatory care and incidence of cardiovascular events

    Science.gov (United States)

    Tu, Jack V.; Chu, Anna; Maclagan, Laura; Austin, Peter C.; Johnston, Sharon; Ko, Dennis T.; Cheung, Ingrid; Atzema, Clare L.; Booth, Gillian L.; Bhatia, R. Sacha; Lee, Douglas S.; Jackevicius, Cynthia A.; Kapral, Moira K.; Tu, Karen; Wijeysundera, Harindra C.; Alter, David A.; Udell, Jacob A.; Manuel, Douglas G.; Mondal, Prosanta; Hogg, William

    2017-01-01

    BACKGROUND: Variations in the prevalence of traditional cardiac risk factors only partially account for geographic variations in the incidence of cardiovascular disease. We examined the extent to which preventive ambulatory health care services contribute to geographic variations in cardiovascular event rates. METHODS: We conducted a cohort study involving 5.5 million patients aged 40 to 79 years in Ontario, Canada, with no hospital stays for cardiovascular disease as of January 2008, through linkage of multiple population-based health databases. The primary outcome was the occurrence of a major cardiovascular event (myocardial infarction, stroke or cardiovascular-related death) over the following 5 years. We compared patient demographics, cardiac risk factors and ambulatory health care services across the province’s 14 health service regions, known as Local Health Integration Networks (LHINs), and evaluated the contribution of these variables to regional variations in cardiovascular event rates. RESULTS: Cardiovascular event rates across LHINs varied from 3.2 to 5.7 events per 1000 person-years. Compared with residents of high-rate LHINs, those of low-rate health regions received physician services more often (e.g., 4.2 v. 3.5 mean annual family physician visits, p value for LHIN-level trend = 0.01) and were screened for risk factors more often. Low-rate LHINs were also more likely to achieve treatment targets for hypercholes-terolemia (51.8% v. 49.6% of patients, p = 0.03) and controlled hypertension (67.4% v. 53.3%, p = 0.04). Differences in patient and health system factors accounted for 74.5% of the variation in events between LHINs, of which 15.5% was attributable to health system factors alone. INTERPRETATION: Preventive ambulatory health care services were provided more frequently in health regions with lower cardiovascular event rates. Health system interventions to improve equitable access to preventive care might improve cardiovascular outcomes. PMID

  10. Twenty-five years of ambulatory laparoscopic cholecystectomy.

    Science.gov (United States)

    Bueno Lledó, José; Granero Castro, Pablo; Gomez I Gavara, Inmaculada; Ibañez Cirión, Jose L; López Andújar, Rafael; García Granero, Eduardo

    2016-10-01

    It is accepted by the surgical community that laparoscopic cholecystectomy (LC) is the technique of choice in the treatment of symptomatic cholelithiasis. However, more controversial is the standardization of system implementation in Ambulatory Surgery because of its different different connotations. This article aims to update the factors that influence the performance of LC in day surgery, analyzing the 25 years since its implementation, focusing on the quality and acceptance by the patient. Individualization is essential: patient selection criteria and the implementation by experienced teams in LC, are factors that ensure high guarantee of success.

  11. Scheduling of procedures and staff in an ambulatory surgery center.

    Science.gov (United States)

    Pash, Joel; Kadry, Bassam; Bugrara, Suhabe; Macario, Alex

    2014-06-01

    For ambulatory surgical centers (ASC) to succeed financially, it is critical for ASC managers to schedule surgical procedures in a manner that optimizes operating room (OR) efficiency. OR efficiency is maximized by using historical data to accurately predict future OR workload, thereby enabling OR time to be properly allocated to surgeons. Other strategies to maintain a well-functioning ASC include recruiting and retaining the right staff and ensuring patients and surgeons are satisfied with their experience. This article reviews different types of procedure scheduling systems. Characteristics of well-functioning ASCs are also discussed.

  12. 76 FR 65885 - Medicare Program; Changes to the Ambulatory Surgical Centers Patient Rights Conditions for Coverage

    Science.gov (United States)

    2011-10-24

    ... 42 CFR Chapter IV Medicare and Medicaid Programs; Changes to the Ambulatory Surgical Centers Patient... Service 42 CFR Part 416 RlN 0938-AP93 Medicare Program; Changes to the Ambulatory Surgical Centers Patient..., or the patient's surrogate prior to the start of the surgical procedure. In addition, we made...

  13. Estimating qualitative parameters for assessment of body balance and arm function in a simulated ambulatory setting

    NARCIS (Netherlands)

    Meulen, van Fokke B.; Reenalda, Jasper; Veltink, Peter H.

    2013-01-01

    Continuous daily-life monitoring of balance control and arm function of stroke survivors in an ambulatory setting, is essential for optimal guidance of rehabilitation. In a simulated ambulatory setting, balance and arm function of seven stroke subjects is evaluated using on-body measurement systems

  14. 42 CFR 419.31 - Ambulatory payment classification (APC) system and payment weights.

    Science.gov (United States)

    2010-10-01

    ... 42 Public Health 3 2010-10-01 2010-10-01 false Ambulatory payment classification (APC) system and... Outpatient Services § 419.31 Ambulatory payment classification (APC) system and payment weights. (a) APC... the Federal Food, Drug and Cosmetic Act. (3) The payment rate determined for an APC group...

  15. Increased systolic ambulatory blood pressure and microalbuminuria in treated and non-treated hypertensive smokers

    DEFF Research Database (Denmark)

    Sørensen, Kaspar; Kristensen, Kjeld S; Bang, Lia E;

    2004-01-01

    The primary aim of the present study was to evaluate the impact of smoking status on both clinic and ambulatory blood pressure (BP) and heart rate (HR) by using 24-h ambulatory BP monitoring in treated and non-treated hypertensive smokers and non-smokers. A secondary aim was to evaluate the inter...... the interrelations between BP, smoking status and microalbuminuria....

  16. Adopting Ambulatory Breast Cancer Surgery as the Standard of Care in an Asian Population

    Directory of Open Access Journals (Sweden)

    Yvonne Ying Ru Ng

    2014-01-01

    Full Text Available Introduction. Ambulatory surgery is not commonly practiced in Asia. A 23-hour ambulatory (AS23 service was implemented at our institute in March 2004 to allow more surgeries to be performed as ambulatory procedures. In this study, we reviewed the impact of the AS23 service on breast cancer surgeries and reviewed surgical outcomes, including postoperative complications, length of stay, and 30-day readmission. Methods. Retrospective review was performed of 1742 patients who underwent definitive breast cancer surgery from 1 March 2004 to 31 December 2010. Results. By 2010, more than 70% of surgeries were being performed as ambulatory procedures. Younger women (P<0.01, those undergoing wide local excision (P<0.01 and those with ductal carcinoma-in situ or early stage breast cancer (P<0.01, were more likely to undergo ambulatory surgery. Six percent of patients initially scheduled for ambulatory surgery were eventually managed as inpatients; a third of these were because of perioperative complications. Wound complications, 30-day readmission and reoperation rates were not more frequent with ambulatory surgery. Conclusion. Ambulatory breast cancer surgery is now the standard of care at our institute. An integrated workflow facilitating proper patient selection and structured postoperativee outpatient care have ensured minimal complications and high patient acceptance.

  17. Determinants of the ambulatory arterial stiffness index in 7604 subjects from 6 populations

    DEFF Research Database (Denmark)

    Adiyaman, Ahmet; Dechering, Dirk G; Boggia, José

    2008-01-01

    The ambulatory arterial stiffness index (AASI) is derived from 24-hour ambulatory blood pressure recordings. We investigated whether the goodness-of-fit of the AASI regression line in individual subjects (r(2)) impacts on the association of AASI with established determinants of the relation between...

  18. Estimation of blood pressure variability from 24-hour ambulatory finger blood pressure

    NARCIS (Netherlands)

    Omboni, S.; Parati, G.; Castiglioni, P.; Rienzo, M. di; Imholz, B.P.M.; Langewouters, G.J.; Wesseling, K.H.; Mancia, G.

    1998-01-01

    Portapres is a noninvasive, beat-to-beat finger blood pressure (BP) monitor that has been shown to accurately estimate 24-hour intra-arterial BP at normal and high BPs. However, no information is available on the ability of this device to accurately track ambulatory BP variability. In 20 ambulatory

  19. Ambulatory Surgical Facilities, Licensed Ambulatory Sugery Centers, Published in 2007, 1:24000 (1in=2000ft) scale, State of California - Office of the State Chief Information Officer.

    Data.gov (United States)

    NSGIC GIS Inventory (aka Ramona) — This Ambulatory Surgical Facilities dataset, published at 1:24000 (1in=2000ft) scale, was produced all or in part from Published Reports/Deeds information as of...

  20. Ambulatory Surgical Facilities, Identify the locations of Ambulatory Surgical Centers, Published in 2012, 1:2400 (1in=200ft) scale, Miami-Dade County, Information Technology Department.

    Data.gov (United States)

    NSGIC GIS Inventory (aka Ramona) — This Ambulatory Surgical Facilities dataset, published at 1:2400 (1in=200ft) scale, was produced all or in part from Other information as of 2012. It is described as...

  1. Study of cyclic and steady particle motion in a realistic human airway model using phase-Doppler anemometry

    Directory of Open Access Journals (Sweden)

    Jícha Miroslav

    2012-04-01

    Full Text Available Transport and deposition of particles in human airways has been of research interest for many years. Various experimental methods such as constant temperature anemometry, particle image velocimetry and laser-Doppler based techniques were employed for study of aerosol transport in the past. We use Phase-Doppler Particle Analyser (P/DPA for time resolved size and velocity measurement of liquid aerosol particles in a size range 1 to 8 μm. The di-2ethylhexyl sabacate (DEHS particles were produced by condensation monodisperse aerosol generator. A thin-wall transparent model of human airways with non-symmetric bifurcations and non-planar geometry containing parts from throat to 3rd-4th generation of bronchi was fabricated for the study. Several cyclic (sinusoidal breathing regimes were simulated using pneumatic breathing mechanism. Analogous steady-flow regimes were also investigated and used for comparison. An analysis of the particle velocity data was performed with aim to gain deeper understanding of the transport phenomena in the realistic bifurcating airway system. Flows of particles of different sizes in range 1 – 10 μm was found to slightly differ for extremely high Stokes numbers. Differences in steady and cyclic turbulence intensities were documented in the paper. Systematically higher turbulence intensity was found for cyclic flows and mainly in the expiration breathing phase. Negligible differences were found for behaviour of different particle size classes in the inspected range 1 to 8 μm. Possibility of velocity spectra estimation of air flow using the P/DPA data is discussed.

  2. Displacement of the medial meniscus within the passive motion characteristics of the human knee joint: an RSA study in human cadaver knees.

    NARCIS (Netherlands)

    Tienen, T.G. van; Buma, P.; Scholten, J.G.; Kampen, A. van; Veth, R.P.H.; Verdonschot, N.J.J.

    2005-01-01

    The objective of this study was to validate an in vitro human cadaver knee-joint model for the evaluation of the meniscal movement during knee-joint flexion. The question was whether our model showed comparable meniscal displacements to those found in earlier meniscal movement studies in vivo. Furth

  3. Ambulatory oxygen: why do COPD patients not use their portable systems as prescribed? A qualitative study

    Directory of Open Access Journals (Sweden)

    Fenwick Angela

    2011-02-01

    Full Text Available Abstract Background Patients with COPD on long term oxygen therapy frequently do not adhere to their prescription, and they frequently do not use their ambulatory oxygen systems as intended. Reasons for this lack of adherence are not known. The aim of this study was to obtain in-depth information about perceptions and use of prescribed ambulatory oxygen systems from patients with COPD to inform ambulatory oxygen design, prescription and management. Methods A qualitative design was used, involving semi-structured face-to-face interviews informed by a grounded theory approach. Twenty-seven UK community-dwelling COPD patients using NHS prescribed ambulatory systems were recruited. Ambulatory oxygen systems comprised cylinders weighing 3.4 kg, a shoulder bag and nasal cannulae. Results Participants reported that they: received no instruction on how to use ambulatory oxygen; were uncertain of the benefits; were afraid the system would run out while they were using it (due to lack of confidence in the cylinder gauge; were embarrassed at being seen with the system in public; and were unable to carry the system because of the cylinder weight. The essential role of carers was also highlighted, as participants with no immediate carers did not use ambulatory oxygen outside the house. Conclusions These participants highlighted previously unreported problems that prevented them from using ambulatory oxygen as prescribed. Our novel findings point to: concerns with the lack of specific information provision; the perceived unreliability of the oxygen system; important carer issues surrounding managing and using ambulatory oxygen equipment. All of these issues, as well as previously reported problems with system weight and patient embarrassment, should be addressed to improve adherence to ambulatory oxygen prescription and enhance the physical and social benefits of maintaining mobility in this patient group. Increased user involvement in both system development

  4. Construction of Motion Database Based on Real-World Haptics

    Science.gov (United States)

    Yokokura, Yuki; Katsura, Seiichiro

    This paper proposes a motion database based on real-world haptics. In order to treat advanced types of haptic information, the motion database contains not only the name of motion and position trajectory of a human operator but also force information. Moreover, the motion database is constructed and managed by a motion database management system, which performs the tasks of inserting, updating, retrieving, and deleting information pertaining to human motion. The motion database management system consists of a motion-copying system, which stores and reproduces the simple motions of the human operator. In this research, the validity and feasibility of the proposed method are verified. By using the proposed method, the motions of human operators in the industrial and medical fields can be stored, dynamically reproduced, and referred.

  5. Pain Management in Ambulatory Surgery—A Review

    Directory of Open Access Journals (Sweden)

    Jan G. Jakobsson

    2014-07-01

    Full Text Available Day surgery, coming to and leaving the hospital on the same day as surgery as well as ambulatory surgery, leaving hospital within twenty-three hours is increasingly being adopted. There are several potential benefits associated with the avoidance of in-hospital care. Early discharge demands a rapid recovery and low incidence and intensity of surgery and anaesthesia related side-effects; such as pain, nausea and fatigue. Patients must be fit enough and symptom intensity so low that self-care is feasible in order to secure quality of care. Preventive multi-modal analgesia has become the gold standard. Administering paracetamol, NSIADs prior to start of surgery and decreasing the noxious influx by the use of local anaesthetics by peripheral block or infiltration in surgical field prior to incision and at wound closure in combination with intra-operative fast acting opioid analgesics, e.g., remifentanil, have become standard of care. Single preoperative 0.1 mg/kg dose dexamethasone has a combined action, anti-emetic and provides enhanced analgesia. Additional α-2-agonists and/or gabapentin or pregabalin may be used in addition to facilitate the pain management if patients are at risk for more pronounced pain. Paracetamol, NSAIDs and rescue oral opioid is the basic concept for self-care during the first 3–5 days after common day/ambulatory surgical procedures.

  6. Ambulatory blood pressure status in children: comparing alternate limit sources.

    Science.gov (United States)

    Bell, Cynthia S; Poffenbarger, Tim S; Samuels, Joshua A

    2011-12-01

    The American Heart Association has included alternate ambulatory blood pressure (ABP) limits for children published by Wühl in 2002. These updated limits employ the same pediatric cohort data as the previous ABP limits published by Soergel in 1997 but differ in analysis technique. The implications of changing ABP limit source on the diagnosis of hypertension has yet to be examined in a large pediatric cohort. We reviewed 741 ABP monitorings performed in children referred to our hypertension clinic between 1991-2007. Hypertension was defined as 24-h mean blood pressure ≥ 95 th percentile or 24-h blood pressure load ≥ 25%, by Soergel and Wühl limits separately. Six hundred seventy-three (91%) children were classified the same by both limit sources. Wühl limits were more likely than Soergel to classify a child as hypertensive (443 vs. 409, respectively). There was an increased classification of prehypertension and decreased white-coat hypertension by the Wühl method, whereas ambulatory and severe hypertension counts remained relatively the same by both limits sources. The use of either limit source will not significantly affect most clinical outcomes but should remain consistent over long-term research projects. Collection of new normative data from a larger, multiethnic population is needed for better measurement of ABP in children.

  7. Motion Simulator

    Science.gov (United States)

    1993-01-01

    MOOG, Inc. supplies hydraulic actuators for the Space Shuttle. When MOOG learned NASA was interested in electric actuators for possible future use, the company designed them with assistance from Marshall Space Flight Center. They also decided to pursue the system's commercial potential. This led to partnership with InterActive Simulation, Inc. for production of cabin flight simulators for museums, expositions, etc. The resulting products, the Magic Motion Simulator 30 Series, are the first electric powered simulators. Movements are computer-guided, including free fall to heighten the sense of moving through space. A projection system provides visual effects, and the 11 speakers of a digital laser based sound system add to the realism. The electric actuators are easier to install, have lower operating costs, noise, heat and staff requirements. The U.S. Space & Rocket Center and several other organizations have purchased the simulators.

  8. Soccer athletes are superior to non-athletes at perceiving soccer-specific and non-sport specific human biological motion.

    Science.gov (United States)

    Romeas, Thomas; Faubert, Jocelyn

    2015-01-01

    Recent studies have shown that athletes' domain specific perceptual-cognitive expertise can transfer to everyday tasks. Here we assessed the perceptual-cognitive expertise of athletes and non-athletes using sport specific and non-sport specific biological motion perception (BMP) tasks. Using a virtual environment, university-level soccer players and university students' non-athletes were asked to perceive the direction of a point-light walker and to predict the trajectory of a masked-ball during a point-light soccer kick. Angles of presentation were varied for orientation (upright, inverted) and distance (2 m, 4 m, 16 m). Accuracy and reaction time were measured to assess observers' performance. The results highlighted athletes' superior ability compared to non-athletes to accurately predict the trajectory of a masked soccer ball presented at 2 m (reaction time), 4 m (accuracy and reaction time), and 16 m (accuracy) of distance. More interestingly, experts also displayed greater performance compared to non-athletes throughout the more fundamental and general point-light walker direction task presented at 2 m (reaction time), 4 m (accuracy and reaction time), and 16 m (reaction time) of distance. In addition, athletes showed a better performance throughout inverted conditions in the walker (reaction time) and soccer kick (accuracy and reaction time) tasks. This implies that during human BMP, athletes demonstrate an advantage for recognizing body kinematics that goes beyond sport specific actions.

  9. Motion Segmentation based Human Motion Capture Data Recovery via Sparse and Low-rank Decomposition%基于运动分割和稀疏低秩分解的失真人体运动捕捉数据恢复

    Institute of Scientific and Technical Information of China (English)

    彭淑娟; 赫高峰; 柳欣; 王华珍; 钟必能

    2015-01-01

    针对人体运动的复杂性和噪声干扰的无序性,提出一种基于运动分割和稀疏低秩分解的失真人体运动捕捉数据恢复方法。首先利用双边滤波对失真运动数据进行预修正,降低干扰数据的奇异信息并保证运动序列的连贯性;其次采用概率主元分析方法将修正后的运动数据进行语义行为自动分割,得到不同姿态的运动语义子区间;再利用加速近端梯度优化算法对每个失真运动子片段数据矩阵根据其更优低秩特性进行稀疏低秩分解,实现运动子片段数据的局部恢复;最后将局部恢复后的各子运动片段根据人体运动序列的时序特性组合,达到整体失真运动捕捉数据恢复的目的。实验结果表明,该方法能够有效地对失真人体运动数据进行恢复,效果显著,有助于重构逼近真实人体姿态的运动捕捉数据。%According to the complexity of human movement and randomness of the noise interference, this paper presents a motion segmentation based approach for human motion capture data recovery via the sparse and low-rank decomposition. The proposed approach first employs the bilateral filter to amend the distorted hu-man motion capture data, featuring on removing singular values and smoothing the motion sequence. Then, the probabilistic principal component analysis (PPCA) method is utilized to segment the motion data into different semantic behaviors automatically. Subsequently, the accelerated proximal gradient algorithm (APG) based sparse and low-rank decomposition is adopted to achieve the partial data recovery with respected to each separated se-mantic behavior. Finally, all the recovered sub-motions are sequentially combined to achieve the whole motion recovery. The experimental results have shown that the proposed motion recovery approach can well restore the distorted human motion data with better performance. The proposed approach can be well utilized to

  10. Challenges of pain control and the role of the ambulatory pain specialist in the outpatient surgery setting.

    Science.gov (United States)

    Vadivelu, Nalini; Kai, Alice M; Kodumudi, Vijay; Berger, Jack M

    2016-01-01

    Ambulatory surgery is on the rise, with an unmet need for optimum pain control in ambulatory surgery centers worldwide. It is important that there is a proportionate increase in the availability of acute pain-management services to match the rapid rise of clinical patient load with pain issues in the ambulatory surgery setting. Focus on ambulatory pain control with its special challenges is vital to achieve optimum pain control and prevent morbidity and mortality. Management of perioperative pain in the ambulatory surgery setting is becoming increasingly complex, and requires the employment of a multimodal approach and interventions facilitated by ambulatory surgery pain specialists, which is a new concept. A focused ambulatory pain specialist on site at each ambulatory surgery center, in addition to providing safe anesthesia, could intervene early once problematic pain issues are recognized, thus preventing emergency room visits, as well as readmissions for uncontrolled pain. This paper reviews methods of acute-pain management in the ambulatory setting with risk stratification, the utilization of multimodal interventions, including pharmacological and nonpharmacological options, opioids, nonopioids, and various routes with the goal of preventing delayed discharge and unexpected hospital admissions after ambulatory surgery. Continued research and investigation in the area of pain management with outcome studies in acute surgically inflicted pain in patients with underlying chronic pain treated with opioids and the pattern and predictive factors for pain in the ambulatory surgical setting is needed.

  11. Adaptation to real motion reveals direction-selective interactions between real and implied motion processing

    NARCIS (Netherlands)

    Lorteije, J.A.M.; Kenemans, J.L.; Jellema, T.; Lubbe, R.H.J. van der; Lommers, M.W.; Wezel, R.J.A. van

    2007-01-01

    Viewing static pictures of running humans evokes neural activity in the dorsal motion-sensitive cortex. To establish whether this response arises from direction-selective neurons that are also involved in real motion processing, we measured the visually evoked potential to implied motion following a

  12. Adaptation to Real Motion Reveals Direction-selective Interactions between Real and Implied Motion Processing

    NARCIS (Netherlands)

    Lorteije, Jeannette A.M.; Kenemans, Leon; Jellema, Tjeerd; Lubbe, van der Rob H.J.; Lommers, Marjolein W.; Wezel, van Richard J.A.

    2007-01-01

    Viewing static pictures of running humans evokes neural activity in the dorsal motion-sensitive cortex. To establish whether this response arises from direction-selective neurons that are also involved in real motion processing, we measured the visually evoked potential to implied motion following a

  13. Auditory Motion Elicits a Visual Motion Aftereffect

    Directory of Open Access Journals (Sweden)

    Christopher C. Berger

    2016-12-01

    Full Text Available The visual motion aftereffect is a visual illusion in which exposure to continuous motion in one direction leads to a subsequent illusion of visual motion in the opposite direction. Previous findings have been mixed with regard to whether this visual illusion can be induced cross-modally by auditory stimuli. Based on research on multisensory perception demonstrating the profound influence auditory perception can have on the interpretation and perceived motion of visual stimuli, we hypothesized that exposure to auditory stimuli with strong directional motion cues should induce a visual motion aftereffect. Here, we demonstrate that horizontally moving auditory stimuli induced a significant visual motion aftereffect—an effect that was driven primarily by a change in visual motion perception following exposure to leftward moving auditory stimuli. This finding is consistent with the notion that visual and auditory motion perception rely on at least partially overlapping neural substrates.

  14. An analysis of risk factors and adverse events in ambulatory surgery

    Directory of Open Access Journals (Sweden)

    Kent C

    2014-06-01

    Full Text Available Christopher Kent, Julia Metzner, Laurent BollagDepartment of Anesthesiology and Pain Medicine, University of Washington Medical Center, Seattle, WA, USAAbstract: Care for patients undergoing ambulatory procedures is a broad and expanding area of anesthetic and surgical practice. There were over 35 million ambulatory surgical procedures performed in the US in 2006. Ambulatory procedures are diverse in both type and setting, as they span the range from biopsies performed under local anesthesia to intra-abdominal laparoscopic procedures, and are performed in offices, freestanding ambulatory surgery centers, and ambulatory units of hospitals. The information on adverse events from these varied settings comes largely from retrospective reviews of sources, such as quality-assurance databases and closed malpractice claims. Very few if any ambulatory procedures are emergent, and in comparison to the inpatient population, ambulatory surgical patients are generally healthier. They are still however subject to most of the same types of adverse events as patients undergoing inpatient surgery, albeit at a lower frequency. The only adverse events that could be considered to be unique to ambulatory surgery are those that arise out of the circumstance of discharging a postoperative patient to an environment lacking skilled nursing care. There is limited information on these types of discharge-related adverse events, but the data that are available are reviewed in an attempt to assist the practitioner in patient selection and discharge decision making. Among ambulatory surgical patients, particularly those undergoing screening or cosmetic procedures, expectations from all parties involved are high, and a definition of adverse events can be expanded to include any occurrence that interrupts the rapid throughput of patients or interferes with early discharge and optimal patient satisfaction. This review covers all types of adverse events, but focuses on the more

  15. Two-character motion analysis and synthesis.

    Science.gov (United States)

    Kwon, Taesoo; Cho, Young-Sang; Park, Sang Il; Shin, Sung Yong

    2008-01-01

    In this paper, we deal with the problem of synthesizing novel motions of standing-up martial arts such as Kickboxing, Karate, and Taekwondo performed by a pair of human-like characters while reflecting their interactions. Adopting an example-based paradigm, we address three non-trivial issues embedded in this problem: motion modeling, interaction modeling, and motion synthesis. For the first issue, we present a semi-automatic motion labeling scheme based on force-based motion segmentation and learning-based action classification. We also construct a pair of motion transition graphs each of which represents an individual motion stream. For the second issue, we propose a scheme for capturing the interactions between two players. A dynamic Bayesian network is adopted to build a motion transition model on top of the coupled motion transition graph that is constructed from an example motion stream. For the last issue, we provide a scheme for synthesizing a novel sequence of coupled motions, guided by the motion transition model. Although the focus of the present work is on martial arts, we believe that the framework of the proposed approach can be conveyed to other two-player motions as well.

  16. Collective motion

    Science.gov (United States)

    Vicsek, Tamás; Zafeiris, Anna

    2012-08-01

    We review the observations and the basic laws describing the essential aspects of collective motion - being one of the most common and spectacular manifestation of coordinated behavior. Our aim is to provide a balanced discussion of the various facets of this highly multidisciplinary field, including experiments, mathematical methods and models for simulations, so that readers with a variety of background could get both the basics and a broader, more detailed picture of the field. The observations we report on include systems consisting of units ranging from macromolecules through metallic rods and robots to groups of animals and people. Some emphasis is put on models that are simple and realistic enough to reproduce the numerous related observations and are useful for developing concepts for a better understanding of the complexity of systems consisting of many simultaneously moving entities. As such, these models allow the establishing of a few fundamental principles of flocking. In particular, it is demonstrated, that in spite of considerable differences, a number of deep analogies exist between equilibrium statistical physics systems and those made of self-propelled (in most cases living) units. In both cases only a few well defined macroscopic/collective states occur and the transitions between these states follow a similar scenario, involving discontinuity and algebraic divergences.

  17. Motion scaling for high-performance driving simulators

    NARCIS (Netherlands)

    Berthoz, A.; Bles, W.; Bülthoff, H.H.; Correia Grácio, B.J.; Feenstra, P.; Filliard, N.; Hühne, R.; Kemeny, A.; Mayrhofer, M.; Mulder, M.; Nusseck, H.G.; Pretto, P.; Reymond, G.; Schlüsselberger, R.; Schwandtner, J.; Teufel, H.; Vailleau, B.; Paassen, M.M.R. van; Vidal, M.; Wentink, M.

    2013-01-01

    Advanced driving simulators aim at rendering the motion of a vehicle with maximum fidelity, which requires increased mechanical travel, size, and cost of the system. Motion cueing algorithms reduce the motion envelope by taking advantage of limitations in human motion perception, and the most common

  18. Commentary on the required skills for ambulatory cardiac care in the young: is training necessary?

    Science.gov (United States)

    Boris, Jeffrey R

    2015-12-01

    Extensive supplemental training exists for many subspecialty disciplines within fellowship training for paediatric cardiology in the United States of America. These disciplines, or domains, such as echocardiography, cardiac intensive care, interventional cardiology, and electrophysiology, allow for initial exposure and training during the basic 3 years of fellowship, plus mandate a 4th year of advanced training; however, ambulatory cardiology has no in-depth or additional training beyond the basic clinical exposure during fellowship training. Ambulatory cardiology is not included in the recommended scheduling of the various domains of cardiology training. This document reviews the reasons to consider augmenting the depth and breadth of training in ambulatory paediatric cardiology.

  19. Adaptation to real motion reveals direction-selective interactions between real and implied motion processing.

    Science.gov (United States)

    Lorteije, Jeannette A M; Kenemans, J Leon; Jellema, Tjeerd; van der Lubbe, Rob H J; Lommers, Marjolein W; van Wezel, Richard J A

    2007-08-01

    Viewing static pictures of running humans evokes neural activity in the dorsal motion-sensitive cortex. To establish whether this response arises from direction-selective neurons that are also involved in real motion processing, we measured the visually evoked potential to implied motion following adaptation to static or moving random dot patterns. The implied motion response was defined as the difference between evoked potentials to pictures with and without implied motion. Interaction between real and implied motion was found as a modulation of this difference response by the preceding motion adaptation. The amplitude of the implied motion response was significantly reduced after adaptation to motion in the same direction as the implied motion, compared to motion in the opposite direction. At 280 msec after stimulus onset, the average difference in amplitude reduction between opposite and same adapted direction was 0.5 muV on an average implied motion amplitude of 2.0 muV. These results indicate that the response to implied motion arises from direction-selective motion-sensitive neurons. This is consistent with interactions between real and implied motion processing at a neuronal level.

  20. Ambulatory Care Visits to Pediatricians in Taiwan: A Nationwide Analysis

    Directory of Open Access Journals (Sweden)

    Ling-Yu Yang

    2015-11-01

    Full Text Available Pediatricians play a key role in the healthy development of children. Nevertheless, the practice patterns of pediatricians have seldom been investigated. The current study analyzed the nationwide profiles of ambulatory visits to pediatricians in Taiwan, using the National Health Insurance Research Database. From a dataset that was randomly sampled one out of every 500 records among a total of 309,880,000 visits in 2012 in the country, 9.8% (n = 60,717 of the visits were found paid to pediatricians. Children and adolescents accounted for only 69.3% of the visits to pediatricians. Male pediatricians provided 80.5% of the services and the main workforces were those aged 40–49 years. The most frequent diagnoses were respiratory tract diseases (64.7% and anti-histamine agents were prescribed in 48.8% of the visits to pediatricians. Our detailed results could contribute to evidence-based discussions on health policymaking.

  1. Bidirectional peritoneal transport of albumin in continuous ambulatory peritoneal dialysis

    DEFF Research Database (Denmark)

    Joffe, P; Henriksen, Jens Henrik Sahl

    1995-01-01

    The present study was undertaken in order to assess bidirectional peritoneal kinetics of albumin after simultaneous i.v. and i.p. injection of radioiodinated albumin tracers (125I-RISA and 131I-RISA) in eight clinically stable uraemic patients undergoing continuous ambulatory peritoneal dialysis...... (CAPD). The plasma volume, intravascular albumin mass (IVM), and overall extravasation rate of albumin were not significantly different from that found in healthy controls. Albumin flux from the plasma into the peritoneal cavity was 3.71 +/- 0.82 (SD) mumol/h, which was only 3% of the overall...... extravasation rate (137 +/- 52 mumol/h). Albumin flux from the peritoneal cavity into the plasma was substantially lower (0.22 +/- 0.07 mumol/h, P peritoneal accumulation of the albumin from plasma over 4 h was 14 +/- 3.2 mumol, which was significantly lower than the intraperitoneal albumin...

  2. Is aerobic workload positively related to ambulatory blood pressure?

    DEFF Research Database (Denmark)

    Korshøj, Mette; Clays, Els; Lidegaard, Mark;

    2016-01-01

    PURPOSE: Cardiovascular disease is prevalent among workers with high levels of occupational physical activity. The increased risk may be due to a high relative aerobic workload, possibly leading to increased blood pressure. However, studies investigating the relation between relative aerobic...... workload and ambulatory blood pressure (ABP) are lacking. The aim was to explore the relationship between objectively measured relative aerobic workload and ABP. METHODS: A total of 116 cleaners aged 18-65 years were included after informed consent was obtained. A portable device (Spacelabs 90217......) was mounted for 24-h measurements of ABP, and an Actiheart was mounted for 24-h heart rate measurements to calculate relative aerobic workload as percentage of relative heart rate reserve. A repeated-measure multi-adjusted mixed model was applied for analysis. RESULTS: A fully adjusted mixed model...

  3. Ambulatory surgery center joint ventures involving tax-exempt entities.

    Science.gov (United States)

    Becker, S; Pristave, R J; McConnell, W

    1999-01-01

    This article provides an overview of the tax-exempt related issues for ambulatory surgery center joint ventures involving tax-exempt entities. The article analyzes the key points of analysis of the guidance released by the IRS, in particular General Counsel Memorandum 39862, Revenue Ruling 98-15, and Redlands Surgical Services v. Commissioner of the Internal Revenue Service. These key points include whether the venture results in private inurement to insiders and whether the venture furthers the charitable purposes of the tax-exempt entity. The article also provides practical guidance to analyze the documents and structure of the joint venture to ensure compliance with the IRS guidance. These practical considerations include, among other things, whether the charitable purposes of the tax-exempt entity are clearly expressed in the documents and whether the tax-exempt entity has sufficient control over the joint venture to ensure the charitable purposes are being adhered to.

  4. Continuous ambulatory peritoneal dialysis: nurses' experiences of teaching patients.

    Science.gov (United States)

    Shubayra, Amnah

    2015-03-01

    Nine nurses were interviewed to determine nurses' experiences of teaching patients to use continuous ambulatory peritoneal dialysis (CAPD). The material was analyzed using content analysis. Data were sorted into four themes and ten subthemes. The themes were presented as follows: Importance of language, individualized teaching, teaching needs and structure of care in teaching. The findings highlighted important insights into how nurses experience teaching patients to perform CAPD. The study revealed some barriers for the nurses during teaching. The major barrier was shortage of Arabic speaking nursing staff. Incidental findings involved two factors that played an important role in teaching, retraining and a special team to perform pre-assessments, including home visits. In conclusion, the findings of this study showed several factors that are considered as barriers for the nurses during teaching the CAPD patients and the need to improve the communication and teaching in the peritoneal dialysis units, including the importance of individualized teaching.

  5. Tuberculous peritonitis in a child undergoing continuous ambulatory peritoneal dialysis.

    Science.gov (United States)

    Tsai, T C; Hsu, J C; Chou, L H; Lee, M L

    1994-01-01

    We present a 13-year-old girl with Arnold-Chiari syndrome and uremia secondary to neurogenic bladder. She had been treated with continuous ambulatory peritoneal dialysis (CAPD) for 13 months prior to the development of peritonitis. The patient demonstrated no improvement with a 3-day therapy of intraperitoneal vancomycin and netilmicin. Meanwhile, smear of centrifuged dialysate revealed acid fast bacilli on two occasions. We, then, started anti-TB therapy with oral isoniazid (INAH), rifampin and ethambutal. The symptoms subsided within three days. In the first week, the patient lost her peritoneal ultrafiltration and needed daytime automatic peritoneal dialysis. At the last follow-up examination, 12 months after treatment, she remained well on standard CAPD.

  6. Eliminating lateral violence in the ambulatory setting: one center's strategies.

    Science.gov (United States)

    Dimarino, Tina J

    2011-05-01

    Lateral violence (eg, disruptive, disparaging, or uncivil behavior inflicted by one peer on another) creates an unpleasant work environment that can have harmful effects on individual nurses, team members, patients, and the bottom line of the health care organization. Educating nurses about the most common forms of lateral violence and strategies for handling inappropriate behavior can be the first step toward eliminating this behavior. Effective nursing leaders develop and maintain a "zero-tolerance" culture that includes clear and concise behavioral expectations and consequences for employees who exhibit unprofessional behavior. Use of a code of conduct, open communication, and quick resolution of issues that arise are strategies that one ambulatory surgery center has used to successfully combat lateral violence in the workplace.

  7. Modifications to the postanesthesia score for use in ambulatory surgery.

    Science.gov (United States)

    Aldrete, J A

    1998-06-01

    The Aldrete Score has withstood the changes in anesthesia and surgical care that have developed in the past three decades. Nevertheless, it is imperative that (1) a modification is made to incorporate the most effective monitor of the respiratory and hemodynamic functions, e.g., pulse oximetry; and (2) the five indices previously used be expanded by incorporating five more indices including dressing, pain, ambulation, fasting/feeding, and urine output to evaluate patients undergoing ambulatory surgery and anesthesia. A patient's recovery from anesthesia and surgery, using 10 indices graded 0, 1, or 2, would provide criteria for street fitness and discharge to home when the patient reaches a postanesthesia recovery score of 18 or higher.

  8. [Approach to the patient in the ambulatory surgery unit].

    Science.gov (United States)

    Cordero-Ponce, Montserrat; Romero-Sánchez, Isabel María; López-Barea, José; Martínez-Ramos, Pablo

    2008-01-01

    Ambulatory surgery aims to improve the quality of care, provide services in an environment closer to users' normal surroundings, reduce the risk of nosocomial infection and release hospital beds for other uses demanded by the population, thus reducing health costs. Nursing activity in these units should aim to restore health and aid the rapid recovery of patients in their homes. To achieve this, an effective health education program is required. Such programs should be simple and, at the same time, cover the care that these patients will require during the recovery period at home. The unit covers patients in the Virgen de Rocío University Hospital, The Fleming Peripheral Center for Specialties and the Virgen de los Reyes Peripheral Center for Specialties in Seville, Spain and the the specialties included are plastic surgery, otorhinolaryngology, orthopedic surgery, urology, and general surgery. The duration of the education program will be at most 14-17 h.

  9. Ambulatory Blood Pressure Monitoring – Clinical Practice Recommendations

    Directory of Open Access Journals (Sweden)

    Katalin Mako

    2016-09-01

    Full Text Available Ambulatory blood pressure monitoring (ABPM became a subject of considerable scientific interest. Due to the increasing use of the ABPM in everyday clinical practice it is important that all the users have a correct knowledge on the clinical indications, the methodology of using the device including some technical issues and the interpretation of results. In the last years several guidelines and position papers have been published with recommendations for the monitoring process, reference values, for clinical practice and research. This paper represents a summary of the most important aspects related to the use of ABPM in daily practice, being a synthesis of recommendations from the recent published guidelines and position papers. This reference article presents the practical and technical issues of ABPM, the use of this method in special situations, the clinical interpretation of measured values including the presentation of different ABPM patterns, derived parameters, the prognostic significance and the limitations of this method.

  10. Using cadence to study free-living ambulatory behaviour.

    Science.gov (United States)

    Tudor-Locke, Catrine; Rowe, David A

    2012-05-01

    The health benefits of a physically active lifestyle across a person's lifespan have been established. If there is any single physical activity behaviour that we should measure well and promote effectively, it is ambulatory activity and, more specifically, walking. Since public health physical activity guidelines include statements related to intensity of activity, it follows that we need to measure and promote free-living patterns of ambulatory activity that are congruent with this intent. The purpose of this review article is to present and summarize the potential for using cadence (steps/minute) to represent such behavioural patterns of ambulatory activity in free-living. Cadence is one of the spatio-temporal parameters of gait or walking speed. It is typically assessed using short-distance walks in clinical research and practice, but free-living cadence can be captured with a number of commercially available accelerometers that possess time-stamping technology. This presents a unique opportunity to use the same metric to communicate both ambulatory performance (assessed under testing conditions) and behaviour (assessed in the real world). Ranges for normal walking cadence assessed under laboratory conditions are 96-138 steps/minute for women and 81-135 steps/minute for men across their lifespan. The correlation between mean cadence and intensity (assessed with indirect calorimetry and expressed as metabolic equivalents [METs]) based on five treadmill/overground walking studies, is r = 0.93 and 100 steps/minute is considered to be a reasonable heuristic value indicative of walking at least at absolutely-defined moderate intensity (i.e. minimally, 3 METs) in adults. The weighted mean cadence derived from eight studies that have observed pedestrian cadence under natural conditions was 115.2 steps/minute, demonstrating that achieving 100 steps/minute is realistic in specific settings that occur in real life. However, accelerometer data collected in a large

  11. Hepatic Dysfunction in Ambulatory Patients With Heart Failure

    Science.gov (United States)

    Farr, Maryjane; Wu, Christina; Givens, Raymond C.; Collado, Ellias; Mancini, Donna M.; Schulze, P. Christian

    2013-01-01

    Objectives This study evaluated the Model for End-Stage Liver Disease (MELD) score and its modified versions, which are established measures of liver dysfunction, as a tool to assess heart transplantation (HTx) urgency in ambulatory patients with heart failure. Background Liver abnormalities have a prognostic impact on the outcome of patients with advanced heart failure. Methods We retrospectively evaluated 343 patients undergoing HTx evaluation between 2005 and 2009. The prognostic effectiveness of MELD and 2 modifications (MELDNa [includes serum sodium levels] and MELD-XI [does not include international normalized ratio]) for endpoint events, defined as death/HTx/ventricular assist device requirement, was evaluated in our cohort and in subgroups of patients on and off oral anticoagulation. Results The MELD and MELDNa scores were excellent predictors for 1-year endpoint events (areas under the curve: 0.71 and 0.73, respectively). High scores (>12) were strongly associated with poor survival at 1 year (MELD 69.3% vs. 90.4% [p < 0.0001]; MELDNa 70.4% vs. 96.9% [p < 0.0001]). Increased scores were associated with increased risk for HTx (hazard ratio: 1.10 [95% confidence interval: 1.06 to 1.14]; p < 0.0001 for both scores), which was independent of other known risk factors (MELD p = 0.0055; MELDNa p = 0.0083). Anticoagulant use was associated with poor survival at 1 year (73.7% vs. 86.4%; p = 0.0118), and the statistical significance of MELD/MELDNa was higher in patients not receiving oral anticoagulation therapy. MELD-XI was a fair but limited predictor of the endpoint events in patients receiving oral anticoagulation therapy. Conclusions Assessment of liver dysfunction according to the MELD scoring system provides additional risk information in ambulatory patients with heart failure. PMID:23563127

  12. Motion control report

    CERN Document Server

    2013-01-01

    Please note this is a short discount publication. In today's manufacturing environment, Motion Control plays a major role in virtually every project.The Motion Control Report provides a comprehensive overview of the technology of Motion Control:* Design Considerations* Technologies* Methods to Control Motion* Examples of Motion Control in Systems* A Detailed Vendors List

  13. Theory of Optimal Human Motion

    Science.gov (United States)

    Chan, Albert Loongtak

    1990-01-01

    This thesis presents optimal theories for punching and running. The first is a theory of the optimal karate punch in terms of the duration and the speed of the punch. This theory is solved and compared with experimental data. The theory incorporates the force vs velocity equation (Hill's eq.) and Wilkie's equation for elbow flexation in determining the optimal punch. The time T and the final speed of the punch are dependent on a few physiological parameters for arm muscles. The theoretical punch agrees fairly well with our experiments and other independent experiments. Second, a theory of optimal running is presented, solved and compared with world track records. The theory is similar to Keller's theory for running (1973) except that the power consumed by a runner is assumed to be proportional to the runner's speed v, P = Hv, whereas Keller took P = constant. There are differential equations for velocity and energy, two initial conditions and two constraint inequalities, involving a total of four free parameters. Optimal control techniques are used to solve this problem and minimize the running time T given the race distance D. The resultant predicted times T agree well with the records and the parameter values are consistent with independent physiological measurements.

  14. 一种人体头部运动姿态的测量方法%A Method of Measurement of Human Head Motion Attitude

    Institute of Scientific and Technical Information of China (English)

    贾培刚; 王少梅

    2011-01-01

    为了解决人体头部在空间环境中运动时,头部的不良姿态对人体身心健康的影响,设计了一种三维姿态传感器用于测量人体头部运动姿态.三维姿态传感器以单片机为处理核心,恒温系统保证系统的测量精度,两路MEMS高精度加速度传感器测量X轴和Y轴姿态,MEMS磁强计测量Z轴姿态,测得的姿态信号经过16位ADC转换器进行模数转换后,由单片机完成数据处理,通过CAN将三种初始姿态信息欧拉角、方向余弦和四元数传输到计算机.用户可以根据不同需要选择一种初始数据采用专用软件实时计算所需的姿态角、速度和位移量等姿态信息.通过计算结果分析,得出人们在不同环境空间里人体身心最佳状态时头部运动的角度、速度和位移等的姿态信息范围,为人们在以后的生活和工作中更好的调控人体头部姿态提供一个标准,使人体始终处在一个舒适愉悦的状态.实验结果表明三维姿态传感器的测量精度分别达到0.08°、0.03°、0.05°,达到了一般实际工程的测量精度要求,且此方法快速、简单、切实可行.%A sensor of 3D attitude is designed to measure the human head motion attitude in order to analyze the problem that the defective human head motion attitude affects the physical and mental health. The core is MCU in the 3D attitude sensor, whose constant temperature system can ensure the measurement accuracy of the system. Two high accuracy acceleration sensors of MEMS measure attitude of X axis and Y axis respectively, and MEMS magnetometer measures the attitude of Z axis. After these measurements being converted by 16-bit ADC, data is managed by MCU, and three initial informations, such as eulerian angles, direction cosine and quaternions,are transmited to computer by CAN. One group of initial data can be chosen as needed to calculate attitude angle, rate or displacement of attitude information in real time by dedicated

  15. Motion sickness: a negative reinforcement model.

    Science.gov (United States)

    Bowins, Brad

    2010-01-15

    Theories pertaining to the "why" of motion sickness are in short supply relative to those detailing the "how." Considering the profoundly disturbing and dysfunctional symptoms of motion sickness, it is difficult to conceive of why this condition is so strongly biologically based in humans and most other mammalian and primate species. It is posited that motion sickness evolved as a potent negative reinforcement system designed to terminate motion involving sensory conflict or postural instability. During our evolution and that of many other species, motion of this type would have impaired evolutionary fitness via injury and/or signaling weakness and vulnerability to predators. The symptoms of motion sickness strongly motivate the individual to terminate the offending motion by early avoidance, cessation of movement, or removal of oneself from the source. The motion sickness negative reinforcement mechanism functions much like pain to strongly motivate evolutionary fitness preserving behavior. Alternative why theories focusing on the elimination of neurotoxins and the discouragement of motion programs yielding vestibular conflict suffer from several problems, foremost that neither can account for the rarity of motion sickness in infants and toddlers. The negative reinforcement model proposed here readily accounts for the absence of motion sickness in infants and toddlers, in that providing strong motivation to terminate aberrant motion does not make sense until a child is old enough to act on this motivation.

  16. Features of ambulatory blood pressure in 540 patients with chronic kidney disease

    Institute of Scientific and Technical Information of China (English)

    王成

    2013-01-01

    Objective To explore the features and influencing factors of ambulatory blood pressure in chronic kidney disease(CKD)patients.Methods A total of 540 CKD patients from May 2010 to May 2012 in our department

  17. A 2-wk reduction of ambulatory activity attenuates peripheral insulin sensitivity

    DEFF Research Database (Denmark)

    Krogh-Madsen, Rikke; Thyfault, John P; Broholm, Christa;

    2010-01-01

    US adults take between approximately 2,000 and approximately 12,000 steps per day, a wide range of ambulatory activity that at the low range could increase risk for developing chronic metabolic diseases. Dramatic reductions in physical activity induce insulin resistance; however, it is uncertain...... possible biological cause for the public health problem of Type 2 diabetes has been identified. Reduced ambulatory activity for 2 wk in healthy, nonexercising young men significantly reduced peripheral insulin sensitivity, cardiovascular fitness, and lean leg mass....... if and how low ambulatory activity would influence peripheral insulin sensitivity. We aimed to explore if healthy, nonexercising subjects who went from a normal to a low level of ambulatory activity for 2 wk would display metabolic alterations including reduced peripheral insulin sensitivity. To do this, ten...

  18. Ambulatory Surgical Facilities, Published in 2010, 1:2400 (1in=200ft) scale, Shawano County.

    Data.gov (United States)

    NSGIC GIS Inventory (aka Ramona) — This Ambulatory Surgical Facilities dataset, published at 1:2400 (1in=200ft) scale, was produced all or in part from Published Reports/Deeds information as of 2010....

  19. Prognostic value of isolated nocturnal hypertension on ambulatory measurement in 8711 individuals from 10 populations

    DEFF Research Database (Denmark)

    Fan, Hong-Qi; Li, Yan; Thijs, Lutgarde;

    2010-01-01

    We and other investigators previously reported that isolated nocturnal hypertension on ambulatory measurement (INH) clustered with cardiovascular risk factors and was associated with intermediate target organ damage. We investigated whether INH might also predict hard cardiovascular endpoints....

  20. Provider practice models in ambulatory oncology practice: analysis of productivity, revenue, and provider and patient satisfaction.

    Science.gov (United States)

    Buswell, Lori A; Ponte, Patricia Reid; Shulman, Lawrence N

    2009-07-01

    Physicians, nurse practitioners, and physician assistants often work in teams to deliver cancer care in ambulatory oncology practices. This is likely to become more prevalent as the demand for oncology services rises, and the number of providers increases only slightly.

  1. Active ambulatory care management supported by short message services and mobile phone technology in patients with arterial hypertension.

    Science.gov (United States)

    Kiselev, Anton R; Gridnev, Vladimir I; Shvartz, Vladimir A; Posnenkova, Olga M; Dovgalevsky, Pavel Ya

    2012-01-01

    The use of short message services and mobile phone technology for ambulatory care management is the most accessible and most inexpensive way to transition from traditional ambulatory care management to active ambulatory care management in patients with arterial hypertension (AH). The aim of this study was to compare the clinical efficacy of active ambulatory care management supported by short message services and mobile phone technology with traditional ambulatory care management in AH patients. The study included 97 hypertensive patients under active ambulatory care management and 102 patients under traditional ambulatory care management. Blood pressure levels, body mass, and smoking history of patients were analyzed in the study. The duration of study was 1 year. In the active ambulatory care management group, 36% of patients were withdrawn from the study within a year. At the end of the year, 77% of patients from the active care management group had achieved the goal blood pressure level. That was more than 5 times higher than that in the traditional ambulatory care management group (P mobile phone improves the quality of ambulatory care of hypertensive patients.

  2. Challenges of pain control and the role of the ambulatory pain specialist in the outpatient surgery setting

    Directory of Open Access Journals (Sweden)

    Vadivelu N

    2016-06-01

    Full Text Available Nalini Vadivelu,1 Alice M Kai,2 Vijay Kodumudi,3 Jack M Berger4 1Department of Anesthesiology, Yale University School of Medicine, New Haven, CT, 2Stony Brook University School of Medicine, Stony Brook, NY, 3Department of Molecular and Cell Biology, College of Liberal Arts and Sciences, University of Connecticut, Storrs, CT, 4Department of Anesthesiology, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA Abstract: Ambulatory surgery is on the rise, with an unmet need for optimum pain control in ambulatory surgery centers worldwide. It is important that there is a proportionate increase in the availability of acute pain-management services to match the rapid rise of clinical patient load with pain issues in the ambulatory surgery setting. Focus on ambulatory pain control with its special challenges is vital to achieve optimum pain control and prevent morbidity and mortality. Management of perioperative pain in the ambulatory surgery setting is becoming increasingly complex, and requires the employment of a multimodal approach and interventions facilitated by ambulatory surgery pain specialists, which is a new concept. A focused ambulatory pain specialist on site at each ambulatory surgery center, in addition to providing safe anesthesia, could intervene early once problematic pain issues are recognized, thus preventing emergency room visits, as well as readmissions for uncontrolled pain. This paper reviews methods of acute-pain management in the ambulatory setting with risk stratification, the utilization of multimodal interventions, including pharmacological and nonpharmacological options, opioids, nonopioids, and various routes with the goal of preventing delayed discharge and unexpected hospital admissions after ambulatory surgery. Continued research and investigation in the area of pain management with outcome studies in acute surgically inflicted pain in patients with underlying chronic pain treated with

  3. Differences between clinical "snap-shot" and "real-life" assessments of lumbar spine alignment and motion - What is the "real" lumbar lordosis of a human being?

    Science.gov (United States)

    Dreischarf, Marcel; Pries, Esther; Bashkuev, Maxim; Putzier, Michael; Schmidt, Hendrik

    2016-03-21

    The individual lumbar lordosis and lumbar motion have been identified to play an important role in pathogenesis of low back pain and are essential references for preoperative planning and postoperative evaluation. The clinical "gold-standard" for measuring lumbar lordosis and its motion are radiological "snap-shots" taken while standing and during upper-body flexion and extension. The extent to which these clinically assessed values characterise lumbar alignment and its motion in daily life merits discussion. A non-invasive measurement-system was employed to measure lumbar lordosis and lumbar motion in 208 volunteers (age: 20-74yrs; ♀/♂: 115/93). For an initial short-term measurement, comparable with the clinical "snap-shot", lumbar lordosis and its motion were assessed while standing and during flexion and extension. Subsequently, volunteers were released to their daily lives while wearing the device, and measurements were performed during the following 24h. The average lumbar lordosis during 24h (8.0°) differed significantly from the standardised measurement while standing (33.3°). Ranges of motion were significantly different throughout the day compared to standing measurements. The influence of the factors age and gender on lordosis and its motion resulted in conflicting results between long- and short-term-measurements. In conclusion, results of short-term examinations differ considerably from the average values during real-life. These findings might be important for surgical planning and increase the awareness of the biomechanical challenges that spinal structures and implants face in real-life. Furthermore, long-term assessments of spinal alignment and motion during daily life can provide valid data on spinal function and can reveal the importance of influential factors.

  4. Patient satisfaction and acceptability: a journey through an ambulatory gynaecology clinic in the West of Ireland

    LENUS (Irish Health Repository)

    Uzochukwu, I

    2016-06-01

    Ambulatory Gynaecology allows a “see-and-treat” approach to managing gynaecological conditions, providing a more streamlined, integrated care pathway than the traditional gynaecology clinic and inpatient care model. This study was designed to assess patient satisfaction and acceptability of Ambulatory Gynaecology services in Mayo University Hospital, Castlebar, Ireland. It also provided for feedback from patients as to how the service might be improved. \\r\

  5. Vascular calcification is not associated with increased ambulatory central aortic systolic pressure in prevalent dialysis patients

    Science.gov (United States)

    Freercks, Robert J; Swanepoel, Charles R; Turest-Swartz, Kristy L; Rayner, Brian L; Carrara, Henri RO; Moosa, Sulaiman EI; Lachman, Anthony S

    2014-01-01

    Summary Introduction Central aortic systolic pressure (CASP) strongly predicts cardiovascular outcomes. We undertook to measure ambulatory CASP in 74 prevalent dialysis patients using the BPro (HealthStats, Singapore) device. We also determined whether coronary or abdominal aortic calcification was associated with changes in CASP and whether interdialytic CASP predicted ambulatory measurement. Methods All patients underwent computed tomography for coronary calcium score, lateral abdominal radiography for aortic calcium score, echocardiography for left ventricular mass index and ambulatory blood pressure measurement using BPro calibrated to brachial blood pressure. HealthStats was able to convert standard BPro SOFT® data into ambulatory CASP. Results Ambulatory CASP was not different in those without and with coronary (137.6 vs 141.8 mmHg, respectively, p = 0.6) or aortic (136.6 vs 145.6 mmHg, respectively, p = 0.2) calcification. Furthermore, when expressed as a percentage of brachial systolic blood pressure to control for peripheral blood pressure, any difference in CASP was abolished: CASP: brachial systolic blood pressure ratio = 0.9 across all categories regardless of the presence of coronary or aortic calcification (p = 0.2 and 0.4, respectively). Supporting this finding, left ventricular mass index was also not different in those with or without vascular calcification (p = 0.7 and 0.8 for coronary and aortic calcification). Inter-dialytic office blood pressure and CASP correlated excellently with ambulatory measurements (r = 0.9 for both). Conclusion Vascular calcification was not associated with changes in ambulatory central aortic systolic pressure in this cohort of prevalent dialysis patients. Inter-dialytic blood pressure and CASP correlated very well with ambulatory measurement. PMID:24626513

  6. Sensing Movement: Microsensors for Body Motion Measurement

    Directory of Open Access Journals (Sweden)

    Hansong Zeng

    2011-01-01

    Full Text Available Recognition of body posture and motion is an important physiological function that can keep the body in balance. Man-made motion sensors have also been widely applied for a broad array of biomedical applications including diagnosis of balance disorders and evaluation of energy expenditure. This paper reviews the state-of-the-art sensing components utilized for body motion measurement. The anatomy and working principles of a natural body motion sensor, the human vestibular system, are first described. Various man-made inertial sensors are then elaborated based on their distinctive sensing mechanisms. In particular, both the conventional solid-state motion sensors and the emerging non solid-state motion sensors are depicted. With their lower cost and increased intelligence, man-made motion sensors are expected to play an increasingly important role in biomedical systems for basic research as well as clinical diagnostics.

  7. Rapid Motion Human Detection Based on Background Subtraction and HOG-LBP%基于背景差与HOG-LBP的快速运动人体检测

    Institute of Scientific and Technical Information of China (English)

    张慧; 郑爱华; 涂铮铮; 罗斌

    2015-01-01

    For the case of close monitoring by monocular static camera,propose a rapid motion human detection algorithm combined with target movement external rectangular length-width ratio,including two steps of moving objects extraction and moving human detection. The moving target extraction is implemented by combining the frame difference and background subtraction,where the frame difference is used to update the background and background subtraction is used to extract the moving target. Moving target discrimination that is human detection can be divided into two parts,the single movement human detection and the crowd detection. Firstly,according to the empirical value of length-width ratio of bounding rectangle of the extracted moving target,the target is divided into single-object and multi-ob-ject. Then,single-object is determined according to the skin color distribution. For multi-object,HOG-LBP features are extracted,fol-lowed by PCA ( Principal Component Analysis) dimensionality reduction. Then the multi-object discrimination is approached by combi-ning with the linear SVM. The experimetal results show the remarkable performance of this method is improved on both detection rate and efficiency.%针对单目静止摄像机近距离监控的情形,结合运动目标外接矩形长宽比,提出一种HOG特征联合LBP特征并通过PCA降维的快速运动人体检测算法。该方法包含两个步骤:运动目标提取和运动人体检测。使用帧差与背景差相结合的方法提取运动目标,帧差用于更新背景,背景差用于提取运动目标。运动目标判别即人体检测分为两个部分:单运动人体检测以及多运动人体检测。首先根据运动目标外接矩形的长宽比,把目标分为单目标以及多目标;然后,根据肤色的分布判断单个行人。对于多目标,提取HOG-LBP特征,用PCA降维,结合线性SVM进行群人目标判定。实验结果表明,该方法不仅提高了人体检

  8. Do Army Helicopter Training Simulators Need Motion Bases?

    OpenAIRE

    McCauley, Michael E.

    2006-01-01

    United States Army Research Institute for the Behavioral and Social Sciences This report reviews the arguments and the evidence regarding the need for simulator motion bases in training helicopter pilots. It discusses flight simulators, perceptual fidelity, history of motion bases, disturbance versus maneuver motion, human motion sensation, and reviews the empirical evidence for the training effectiveness of motion bases. The section on training effectiveness reviews research f...

  9. IMU-based ambulatory walking speed estimation in constrained treadmill and overground walking.

    Science.gov (United States)

    Yang, Shuozhi; Li, Qingguo

    2012-01-01

    This study evaluated the performance of a walking speed estimation system based on using an inertial measurement unit (IMU), a combination of accelerometers and gyroscopes. The walking speed estimation algorithm segments the walking sequence into individual stride cycles (two steps) based on the inverted pendulum-like behaviour of the stance leg during walking and it integrates the angular velocity and linear accelerations of the shank to determine the displacement of each stride. The evaluation was performed in both treadmill and overground walking experiments with various constraints on walking speed, step length and step frequency to provide a relatively comprehensive assessment of the system. Promising results were obtained in providing accurate and consistent walking speed/step length estimation in different walking conditions. An overall percentage root mean squared error (%RMSE) of 4.2 and 4.0% was achieved in treadmill and overground walking experiments, respectively. With an increasing interest in understanding human walking biomechanics, the IMU-based ambulatory system could provide a useful walking speed/step length measurement/control tool for constrained walking studies.

  10. A motion retargeting algorithm based on model simplification

    Institute of Scientific and Technical Information of China (English)

    2005-01-01

    A new motion retargeting algorithm is presented, which adapts the motion capture data to a new character. To make the resulting motion realistic, the physically-based optimization method is adopted. However, the optimization process is difficult to converge to the optimal value because of high complexity of the physical human model. In order to address this problem, an appropriate simplified model automatically determined by a motion analysis technique is utilized, and then motion retargeting with this simplified model as an intermediate agent is implemented. The entire motion retargeting algorithm involves three steps of nonlinearly constrained optimization: forward retargeting, motion scaling and inverse retargeting. Experimental results show the validity of this algorithm.

  11. Motion in radiotherapy

    DEFF Research Database (Denmark)

    Korreman, Stine Sofia

    2012-01-01

    This review considers the management of motion in photon radiation therapy. An overview is given of magnitudes and variability of motion of various structures and organs, and how the motion affects images by producing artifacts and blurring. Imaging of motion is described, including 4DCT and 4DPET...

  12. Control and Experiment for Exoskeleton Robot Based on Kalman Prediction of Human Motion Intent%基于人体运动意图卡尔曼预测的外骨骼机器人控制及实验

    Institute of Scientific and Technical Information of China (English)

    龙亿; 杜志江; 王伟东

    2015-01-01

    To accurately acquire human motion intent for exoskeleton control, torque sensors are used to measure human-robot interaction information. Based on the single pendulum model of human swing leg, the motion trajectory of lower limb joints is obtained, which is predicted with Kalman filter to compensate the delay of motion intent. The PD (proportional-derivative) control law is used to control exoskeleton to track the joint trajectory of human swing leg, and real-time position of the exoskeleton joint is fed back by the encoder, which forms a closed-loop position control. Experiments on the exoskeleton swing leg are conducted and the results show that motion intent of human swing leg can be predicted with the measured human-robot interaction information using Kalman filter, and the exoskeleton robot can achieve the joint trajectory tracking of human swing leg. Therefore, the proposed method is effective.%为在外骨骼控制中准确获取人体运动意图,本文使用力矩传感器测量人机交互信息。基于人体下肢摆动腿的单摆模型获得摆动腿关节的运动轨迹,并使用卡尔曼滤波进行预测,从而弥补意图延时。使用PD(比例-微分)控制律控制外骨骼跟踪人体摆动腿的关节轨迹,编码器反馈外骨骼关节的实时位置,形成位置闭环控制。进行外骨骼摆动腿实验,结果表明,测得的人机交互信息经过卡尔曼滤波后,可以预测人体摆动腿的运动意图,外骨骼机器人能够实现对人体摆动腿关节轨迹的跟随,所提方法可行。

  13. Visual-vestibular interaction in motion perception

    NARCIS (Netherlands)

    Hosman, R.J.A.W.; Cardullo, F.M.; Bos, J.E.

    2011-01-01

    Correct perception of self motion is of vital importance for both the control of our position and posture when moving around in our environment. With the development of human controlled vehicles as bicycles, cars and aircraft motion perception became of interest for the understanding of vehicle cont

  14. Multiple-stage ambiguity in motion perception reveals global computation of local motion directions.

    Science.gov (United States)

    Rider, Andrew T; Nishida, Shin'ya; Johnston, Alan

    2016-12-01

    The motion of a 1D image feature, such as a line, seen through a small aperture, or the small receptive field of a neural motion sensor, is underconstrained, and it is not possible to derive the true motion direction from a single local measurement. This is referred to as the aperture problem. How the visual system solves the aperture problem is a fundamental question in visual motion research. In the estimation of motion vectors through integration of ambiguous local motion measurements at different positions, conventional theories assume that the object motion is a rigid translation, with motion signals sharing a common motion vector within the spatial region over which the aperture problem is solved. However, this strategy fails for global rotation. Here we show that the human visual system can estimate global rotation directly through spatial pooling of locally ambiguous measurements, without an intervening step that computes local motion vectors. We designed a novel ambiguous global flow stimulus, which is globally as well as locally ambiguous. The global ambiguity implies that the stimulus is simultaneously consistent with both a global rigid translation and an infinite number of global rigid rotations. By the standard view, the motion should always be seen as a global translation, but it appears to shift from translation to rotation as observers shift fixation. This finding indicates that the visual system can estimate local vectors using a global rotation constraint, and suggests that local motion ambiguity may not be resolved until consistencies with multiple global motion patterns are assessed.

  15. Influence of Visual Motion, Suggestion, and Illusory Motion on Self-Motion Perception in the Horizontal Plane.

    Directory of Open Access Journals (Sweden)

    Steven David Rosenblatt

    Full Text Available A moving visual field can induce the feeling of self-motion or vection. Illusory motion from static repeated asymmetric patterns creates a compelling visual motion stimulus, but it is unclear if such illusory motion can induce a feeling of self-motion or alter self-motion perception. In these experiments, human subjects reported the perceived direction of self-motion for sway translation and yaw rotation at the end of a period of viewing set visual stimuli coordinated with varying inertial stimuli. This tested the hypothesis that illusory visual motion would influence self-motion perception in the horizontal plane. Trials were arranged into 5 blocks based on stimulus type: moving star field with yaw rotation, moving star field with sway translation, illusory motion with yaw, illusory motion with sway, and static arrows with sway. Static arrows were used to evaluate the effect of cognitive suggestion on self-motion perception. Each trial had a control condition; the illusory motion controls were altered versions of the experimental image, which removed the illusory motion effect. For the moving visual stimulus, controls were carried out in a dark room. With the arrow visual stimulus, controls were a gray screen. In blocks containing a visual stimulus there was an 8s viewing interval with the inertial stimulus occurring over the final 1s. This allowed measurement of the visual illusion perception using objective methods. When no visual stimulus was present, only the 1s motion stimulus was presented. Eight women and five men (mean age 37 participated. To assess for a shift in self-motion perception, the effect of each visual stimulus on the self-motion stimulus (cm/s at which subjects were equally likely to report motion in either direction was measured. Significant effects were seen for moving star fields for both translation (p = 0.001 and rotation (p0.1 for both. Thus, although a true moving visual field can induce self-motion, results of this

  16. Childhood astrovirus-associated diarrhea in the ambulatory setting in a Public Hospital in Cordoba city, Argentina

    Directory of Open Access Journals (Sweden)

    Giordano Miguel O.

    2004-01-01

    Full Text Available Human astroviruses have been increasingly identified as important agents of diarrheal disease in children. However, the disease burden of astrovirus infection is still incompletely assessed. This paper reports results on the epidemiological and clinical characteristics of astrovirus-associated diarrhea, as well as the impact of astrovirus infection on the ambulatory setting at a Public Hospital in Córdoba city, Argentina. From February 2001 through January 2002, 97 randomly selected outpatient visits for diarrhea among children 0.05. According to our estimation about one out of seventy-four children in this cohort would be assisted annually for an astroviral-diarrheal episode in the Public Hospital and one out of eight diarrheal cases could be attributed to astrovirus infection. Astrovirus is a common symptomatic infection in pediatric outpatient visits in the public hospital in the study area, contributing 12.37% of the overall morbidity from diarrhea.

  17. CT features of peritonitis associated with continuous ambulatory peritoneal dialysis

    Energy Technology Data Exchange (ETDEWEB)

    Yun, Ji Young; Byun, Jae Young; Lee, Sang Hoon; Kwon, Tae Ahn; Kim, Yeon Kil; Kim, Young Ok; Song, Kyung Sup [The Catholic Univ. of Korea College of Medicine, Seoul (Korea, Republic of)

    1999-01-01

    To evaluate the CT findings of peritonitis associated with continuous ambulatory peritoneal dialysis(CAPD). We retrospectively analyzed CT scans of 14 symptomatic patients with peritonitis after CAPD. Diffuse abdominal pain was present in 11, fever in two, and abdominal mass with vomiting in one. The mean duration of CAPD ranged from 10 months to 5 years(mean : 3.9 years). On abdominal CT, we evaluated the presence and location of ascites, bowel wall thickening, cocoon formation, the pattern of enhancement of peritoneal thickening, the presence of calcifications in the peritoneum, and mesenteric and omental change. On enhanced CT, multiloculated ascites was observed in all cases(n=14) ; it was located mainly in the pelvic cavity with small multi-loculated fluid collections in the peritoneal cavity(n=13), including the lesser sac(n=3). In one patient, ascites was located in the space between the greater omentum and anterior peritoneal surface. CT showed ileus in 12 cases, small bowel wall thickening in 11, and cocoon formation in five. Uneven but smooth thickening of the peritoneum, with contrast enhancement, was seen in eight cases, and in five of these, peritoneal thickening was more prominent in the anterior peritoneum. Other findings included reticular opacity in two cases, hematoma of the rectus muscle in one, and umbilical hernia in one. Multiloculated fluid collection, ileus, small bowel wall thickening, uneven but smooth peritoneal thickening, and cocoon formation appear to be CT features of CAPD peritonitis.

  18. Utilization of lean management principles in the ambulatory clinic setting.

    Science.gov (United States)

    Casey, Jessica T; Brinton, Thomas S; Gonzalez, Chris M

    2009-03-01

    The principles of 'lean management' have permeated many sectors of today's business world, secondary to the success of the Toyota Production System. This management method enables workers to eliminate mistakes, reduce delays, lower costs, and improve the overall quality of the product or service they deliver. These lean management principles can be applied to health care. Their implementation within the ambulatory care setting is predicated on the continuous identification and elimination of waste within the process. The key concepts of flow time, inventory and throughput are utilized to improve the flow of patients through the clinic, and to identify points that slow this process -- so-called bottlenecks. Nonessential activities are shifted away from bottlenecks (i.e. the physician), and extra work capacity is generated from existing resources, rather than being added. The additional work capacity facilitates a more efficient response to variability, which in turn results in cost savings, more time for the physician to interact with patients, and faster completion of patient visits. Finally, application of the lean management principle of 'just-in-time' management can eliminate excess clinic inventory, better synchronize office supply with patient demand, and reduce costs.

  19. Dynamics of ambulatory surgery centers and hospitals market entry.

    Science.gov (United States)

    Housman, Michael; Al-Amin, Mona

    2013-08-01

    In this article, we investigate the diversity of healthcare delivery organizations by comparing the market determinants of hospitals entry rates with those of ambulatory surgery centers (ASCs). Unlike hospitals, ASCs is one of the growing populations of specialized healthcare delivery organizations. There are reasons to believe that firm entry patterns differ within growing organizational populations since these markets are characterized by different levels of organizational legitimacy, technological uncertainty, and information asymmetry. We compare the entry patterns of firms in a mature population of hospitals to those of firms within a growing population of ASCs. By using patient-level datasets from the state of Florida, we break down our explanatory variables by facility type (ASC vs. hospital) and utilize negative binomial regression models to evaluate the impact of niche density on ASC and hospital entry. Our results indicate that ASCs entry rates is higher in markets with overlapping ASCs while hospitals entry rates are less in markets with overlapping hospitals and ASCs. These results are consistent with the notion that firms in growing populations tend to seek out crowded markets as they compete to occupy the most desirable market segments while firms in mature populations such as general hospitals avoid direct competition.

  20. Marginal ambulatory teaching cost under varying levels of service utilization.

    Science.gov (United States)

    Panton, D M; Mushlin, A I; Gavett, J W

    1980-06-01

    The ambulatory component of residency training jointly produces two products, namely, training and patient services. In costing educational programs of this type, two approaches are frequently taken. The first considers the total costs of the educational program, including training and patient services. These costs are usually constructed from historical accounting records. The second approach attempts to cost the joint products separately, based upon estimates of future changes in program costs, if the product in question is added to or removed from the program. The second approach relates to typical decisions facing the managers of medical centers and practices used for teaching purposes. This article reports such a study of costs in a primary-care residency training program in a hospital outpatient setting. The costs of the product, i.e., on-the-job training, are evaluated using a replacement-cost concept under different levels of patient services. The results show that the cost of the product, training, is small at full clinical utilization and is sensitive to changes in the volume of services provided.

  1. Mobile Personal Health System for Ambulatory Blood Pressure Monitoring

    Directory of Open Access Journals (Sweden)

    Luis J. Mena

    2013-01-01

    Full Text Available The ARVmobile v1.0 is a multiplatform mobile personal health monitor (PHM application for ambulatory blood pressure (ABP monitoring that has the potential to aid in the acquisition and analysis of detailed profile of ABP and heart rate (HR, improve the early detection and intervention of hypertension, and detect potential abnormal BP and HR levels for timely medical feedback. The PHM system consisted of ABP sensor to detect BP and HR signals and smartphone as receiver to collect the transmitted digital data and process them to provide immediate personalized information to the user. Android and Blackberry platforms were developed to detect and alert of potential abnormal values, offer friendly graphical user interface for elderly people, and provide feedback to professional healthcare providers via e-mail. ABP data were obtained from twenty-one healthy individuals (>51 years to test the utility of the PHM application. The ARVmobile v1.0 was able to reliably receive and process the ABP readings from the volunteers. The preliminary results demonstrate that the ARVmobile 1.0 application could be used to perform a detailed profile of ABP and HR in an ordinary daily life environment, bedsides of estimating potential diagnostic thresholds of abnormal BP variability measured as average real variability.

  2. Endoscope ambulatory nasal polipectomy. Introduction in Sancti Spiritus province.

    Directory of Open Access Journals (Sweden)

    Raquel M. García Alemán

    2010-10-01

    Full Text Available A longitudinal retrospective descriptive study carried out in the Otorrinolaringology Services of the “Camilo Cienfuegos” General Hospital in Sancti Spiritus from september 2007 to september 2009.The population comprised 130 patients diagnosed with Chronic rhinosinusitis and the sample included 48 who showed Bilateral Poliposis grade III-IV who fulfilled the inclusion criteria. The general objective was to determine the results of the endoscopic ambulatory nasal polipectomy; specific objective to evaluate the variables of age and gender clinical manifestations, endoscopic findings, complication histological findings and degree of satisfaction. The statistical analysis included the calculation of frequency stadigraphs expressed in numbers and percentages. Chronic rhinosinusitis which nasal polyposis was more frequent in white men over 40 years-old, the primary symptoms were nasal obstruction and anosmia. The post-surgical medical treatment was carried out depending on the histological study with a predominance of eosinophils. The endoscopy determined the degree of grade III; the classic bilateral anterior tamponing was remplaced by surgical neurolentins made in the room. No patient showed pain during the surgery act, they improved their life quality.

  3. Non Infectious Complications of Continuous Ambulatory Peritoneal Dialysis

    Directory of Open Access Journals (Sweden)

    K. Flayou

    2015-02-01

    Full Text Available Introduction: Continuous ambulatory peritoneal dialysis has proven to be as effective as hemodialysis. However, it is associated with several complications. The aim of this study is to evaluate the prevalence and outcome of complications in patients treated with peritoneal dialysis at our center. Material and methods: A retrospective study between January 2007 and February 2015 at the nephrology, dialysis and renal transplantation department of Ibn Sina university. Predisposing factors and long-term outcomes were analyzed. Results: Fifty two mechanical complications were noted among thirty eight patients between June 2007 and February 2015. Migration was the most common (23 cases followed by obstruction, hernia and dialysate leakes in respectively 9, 7 and 6 cases. We have also noted 2 cases of hemoperitoneum, 3 catheter perforation and 2 cases of externalization. Onset time of complications was 25,4 ± 12,7 months. Conclusion: this study proves the interest of the prevention of mechanical complications in peritoneal dialysis. This requires a periodic retraining of patients and caregivers.

  4. Kidney volume and ambulatory blood pressure in children.

    Science.gov (United States)

    Gurusinghe, Shari; Palvanov, Arkadiy; Bittman, Mark E; Singer, Pamela; Frank, Rachel; Chorny, Nataliya; Infante, Lulette; Sethna, Christine B

    2016-12-16

    Low nephron number has been shown to be a risk factor for hypertension (HTN) in adulthood. Kidney volume may serve as a surrogate marker for nephron mass. The relationship between kidney volume and ambulatory blood pressure (BP) in the pediatric population is not known. A retrospective chart review of children younger than 21 years who were evaluated for HTN was performed. Twenty-four-hour BP and ultrasonography data were obtained. Multiple regression was used to examine associations between BP and kidney volume. Of 84 children (mean age 13.87 years, 72.6% males), 54 had HTN. Systolic BP index during the awake, sleep, and 24-hour periods (all P≤.05) was found to be positively correlated with total kidney volume. Greater total kidney volume was found to be a positive predictor of 24-hour and sleep systolic index (P≤.05). It failed to serve as a predictor of HTN, pre-HTN, or white-coat HTN. Contrary to expectation, total kidney volume was positively associated with systolic BP indices.

  5. Ibuprofen timing for hand surgery in ambulatory care

    Science.gov (United States)

    Giuliani, Enrico; Bianchi, Anna; Marcuzzi, Augusto; Landi, Antonio; Barbieri, Alberto

    2015-01-01

    OBJECTIVE: To evaluate the effect of pre-operative administration of ibuprofen on post-operative pain control vs. early post-operative administration for hand surgery procedures performed under local anaesthesia in ambulatory care. METHODS: Candidates to trigger finger release by De Quervain tenosynovitis and carpal tunnel operation under local anesthesia were enrolled in the study. Group A received 400 mg ibuprofen before the operation and placebo after the procedure; group B received placebo before the operation and ibuprofen 400 mg at the end of the procedure; both groups received ibuprofen 400 mg every 6h thereafter. Visual analogue scale (VAS) was measured at fixed times before and every 6h after surgery, for a total follow-up of 18h. RESULTS: Groups were similar according to age, gender and type of surgery. Median VAS values did not produce any statistical significance, while there was a statistically significant difference on pre-operative and early post-operative VAS values between groups (A -8.53 mm vs. B 3.36 mm, p=0.0085). CONCLUSION: Average pain levels were well controlled by local anesthesia and post-operative ibuprofen analgesia. Pre-operative ibuprofen administration can contribute to improve early pain management. Level of Evidence II, Therapeutic Studies. PMID:26327799

  6. The content of hope in ambulatory patients with colon cancer.

    Science.gov (United States)

    Beckman, Emily S; Helft, Paul R; Torke, Alexia M

    2013-01-01

    Although hope is a pervasive concept in cancer treatment, we know little about how ambulatory patients with cancer define or experience hope. We explored hope through semistructured interviews with ten patients with advanced (some curable, some incurable) colon cancer at one Midwestern, university-based cancer center. We conducted a thematic analysis to identify key concepts related to patient perceptions of hope. Although we did ask specifically about hope, patients also often revealed their hopes in response to indirect questions or by telling stories about their cancer experience. We identified four major themes related to hope: 1) hope is essential, 2) a change in perspective, 3) the content of hope, and 4) communicating about hope. The third theme, the content of hope, included three subthemes: a) the desire for normalcy, b) future plans, and c) hope for a cure. We conclude that hope is an essential concept for patients undergoing treatment for cancer as it pertains to their psychological well-being and quality of life, and hope for a cure is not and should not be the only consideration. In a clinical context, the exploration of patients' hopes and aspirations in light of their cancer diagnosis is important because it provides a frame for understanding their goals for treatment. Exploration of the content of patients' hope can not only help to illuminate misunderstandings but also clarify how potential treatments may or may not contribute to achieving patients' goals.

  7. Biological Motion Perception in Autism

    Directory of Open Access Journals (Sweden)

    J Cusack

    2011-04-01

    Full Text Available Typically developing adults can readily recognize human actions, even when conveyed to them via point-like markers placed on the body of the actor (Johansson, 1973. Previous research has suggested that children affected by autism spectrum disorder (ASD are not equally sensitive to this type of visual information (Blake et al, 2003, but it remains unknown why ASD would impact the ability to perceive biological motion. We present evidence which looks at how adolescents and adults with autism are affected by specific factors which are important in biological motion perception, such as (eg, inter-agent synchronicity, upright/inverted, etc.

  8. Infrared Motion Sensing for Human-Following with Mobile Robots%实现机器人随动的红外感知方法

    Institute of Scientific and Technical Information of China (English)

    冯国栋; 刘敏; 王国利

    2012-01-01

    Considering the requirements for target localization of human-following robots, a hierarchical infrared motion sensing paradigm and its physical implementation using pyroelectric infrared (PIR) sensors are presented. From the perspec-tive of sensing model, the proposed sensing paradigm is structured in two tiers. The bottom tier is the geometric sensing tier, and it is composed of geometric sensing units, which offer multi-view bearing measurements of a moving target within the field of view (FOV) of a robot. The upper tier is the cooperative sensing tier, and it coordinates the geometric sensing units at the bottom tier to localize the moving target. From the perspective of physical implementation, at the bottom tier, the geometric sensing units for measuring the bearing information of the moving target are constructed by combining PIR sensors and Fresnel lens arrays. At the upper tier, the least square optimization is used to fuse the multi-view bearing measurements to obtain the position information of the moving target. The experimental results are given to validate the proposed sensing method in the context of human-following with mobile robots. Compared with the multi-view optical vision techniques, the proposed method has irreplaceable advantages of high sensing efficiency, robustness to illumination and background changes, low-cost and low energy consumption.%结合机器人随动任务对人体运动定位的需求,提出一种分层递阶结构的红外运动感知模式,及基于热释电红外传感器的物理实现方法.在传感模型方面,采用两层递阶结构的感知模式:底层为由多个几何传感单元构成的几何传感层,在机器人视野内实现多视角运动目标的方位测量;上层为协作感知层,用来组织底层各几何传感单元的协作,实现运动目标的定位测量.在物理实现方面,底层组合热释电红外传感阵列与菲涅尔透镜组,构建运动目标方位角测量所需的几何传感单

  9. Exoskeleton Motion Control for Children Walking Rehabilitation

    Directory of Open Access Journals (Sweden)

    Cristina Ploscaru

    2016-06-01

    Full Text Available This paper introduces a quick method for motion control of an exoskeleton used on children walking rehabilitation with ages between four to seven years old. The exoskeleton used on this purpose has six servomotors which work independently and actuates each human lower limb joints (hips, knees and ankles. For obtaining the desired motion laws, a high-speed motion analysis equipment was used. The experimental rough data were mathematically modeled in order to obtain the proper motion equations for controlling the exoskeleton servomotors.

  10. Animal models in motion sickness research

    Science.gov (United States)

    Daunton, Nancy G.

    1990-01-01

    Practical information on candidate animal models for motion sickness research and on methods used to elicit and detect motion sickness in these models is provided. Four good potential models for use in motion sickness experiments include the dog, cat, squirrel monkey, and rat. It is concluded that the appropriate use of the animal models, combined with exploitation of state-of-the-art biomedical techniques, should generate a great step forward in the understanding of motion sickness mechanisms and in the development of efficient and effective approaches to its prevention and treatment in humans.

  11. 基于中心距离特征的人体运动序列关键帧提取%Key Frame Extraction Using Central Distance Feature for Human Motion Data

    Institute of Scientific and Technical Information of China (English)

    彭淑娟

    2012-01-01

    运动捕获数据的关键帧是原始运动序列的简洁表示,对于运动压缩、运动检索和运动分割起着重要的作用。提出了一种基于中心距离特征的人体运动捕获数据关键帧提取方法,通过提取四肢到中心点ROOT的距离,得到一组中心距离特征,将特征分为上肢和下肢来分别表示,并提取上下肢的距离模,得到二维的特征向量模;然后采用主成分分析得到一维特征,并提取其局部极值点作为初始关键帧;最后通过对初始关键帧的重新筛选与插入得到最终关键帧序列。实验结果表明,该方法提取的关键帧序列在视觉上能够很好的概括原始运动序列的内容,且具有高压缩率。%The key frames of the motion capture data are the concise description for the original motion sequence,which play an important role for the motion compression,motion retrieval and motion segmentation.A key frame extraction method based on the central distance features for the human motion capture data was proposed.The approach was divided into three main stages.In the first stage,a set of central distance features from the center joint ROOT to limbs was selected,and those features were divided into the upper and lower limbs norms.In the second stage,PCA method was used to get the one dimension principal component,which was used to extract the local optimum as the initial key frames.In the last stage,the initial key frames were filtered and inserted to get the final key frames.Experimental results show that the proposed method can get the needed key frames,which can have good visual generalization of the original motion sequence,and also be of high compression ratio as well.

  12. US National Practice Patterns in Ambulatory Operative Management of Lateral Epicondylitis.

    Science.gov (United States)

    Buller, Leonard T; Best, Matthew J; Nigen, David; Ialenti, Marc; Baraga, Michael G

    2015-12-01

    Lateral epicondylitis is a common cause of elbow pain, frequently responsive to nonoperative management. There are multiple operative techniques for persistently symptomatic patients who have exhausted conservative therapies. Little is known regarding US national trends in operative management of lateral epicondylitis. We conducted a study to investigate changes in use of ambulatory procedures for lateral epicondylitis. Cases of lateral epicondylitis were identified using the National Survey of Ambulatory Surgery and were analyzed for trends in demographics and use of ambulatory surgery. Between 1994 and 2006, the population-adjusted rate of ambulatory surgical procedures increased from 7.29 to 10.44 per 100,000 capita. The sex-adjusted rate of surgery for lateral epicondylitis increased by 85% among females and decreased by 31% among males. Most patients were between ages 40 and 49 years, and the largest percentage increase in age-adjusted rates was found among patients older than 50 years (275%) between 1994 and 2006. Use of regional anesthesia increased from 17% in 1994 to 30% in 2006. Private insurance remained the most common payer. Awareness of the increasing use of ambulatory surgery for lateral epicondylitis may lead to changes in health care policies and positively affect patient care.

  13. Perspectives on ambulatory anesthesia: the patient’s point of view

    Directory of Open Access Journals (Sweden)

    Sehmbi H

    2014-12-01

    Full Text Available Herman Sehmbi, Jean Wong, David T WongDepartment of Anesthesia, Toronto Western Hospital, University Health Network, University of Toronto, Toronto, ON, CanadaAbstract: Recent advances in anesthetic and surgical techniques have led to tremendous growth of ambulatory surgery. With patients with many co-morbid conditions undergoing complex procedures in an ambulatory setting, the challenges in providing ambulatory surgery and anesthesia are immense. In recent years, the paradigm has shifted from a health-care provider focus involving process compliance and clinical outcomes, to a patient-centered strategy that includes patients’ perspectives of desired outcomes. Improving preoperative patient education while reducing unnecessary testing, improving postoperative pain management, and reducing postoperative nausea and vomiting may help enhance patient satisfaction. The functional status of most patients is reduced postoperatively, and thus the pattern of recovery is an area of ongoing research. Standardized and validated psychometric questionnaires such as Quality of Recovery-40 and Postoperative Quality of Recovery Scale are potential tools to assess this. Patient satisfaction has been identified as an important outcome measure and dedicated tools to assess this in various clinical settings are needed. Identification of key aspects of ambulatory surgery deemed important from patients’ perspectives, and implementation of validated outcome questionnaires, are important in improving patient centered care and patient satisfaction.Keywords: ambulatory, patient, satisfaction, anesthesia, outcomes, questionnaire, perspectives

  14. Outpatient costing and classification: are we any closer toa national standard for ambulatory classification systems?

    Science.gov (United States)

    Cleary, M I; Murray, J M; Michael, R; Piper, K

    1998-10-19

    The Outpatient Costing and Classification Study was commissioned by the Department of Health and Family Services to evaluate the suitability of the Developmental Ambulatory Classification System (DACS). Data on the full range of ambulatory services (outpatient clinics, emergency departments and allied health services) were collected prospectively from a stratified sample of 28 public hospitals. Patient encounters captured in the study represent 1% of the total ambulatory encounters in Australia in one year. Costing per encounter included time spent with the patient, cost of procedures, indirect costs (salaries and consumables), overhead costs and diagnostic costs. The most significant variable explaining cost variation was hospital type, followed by outpatient clinic type. Visit type and presence or absence of a procedure--major splits for the proposed DACS--did not produce splits that were consistent across all hospital strata. The study found that DACS is not an appropriate classification for hospital ambulatory services. A clinic-based structure for outpatients and allied health departments is recommended for classifying and funding ambulatory services in Australia.

  15. Ambulatory assessed implicit affect is associated with salivary cortisol

    Directory of Open Access Journals (Sweden)

    Joram eMossink

    2015-02-01

    Full Text Available One of the presumed pathways linking negative emotions to adverse somatic health is an overactive HPA-axis, usually indicated by elevated cortisol levels. Traditionally, research has focused on consciously reported negative emotions. Yet, given that the majority of information processing occurs without conscious awareness, stress physiology might also be influenced by affective processes that people are not aware of. In a 24-hour ambulatory study we examined whether cortisol levels were associated with two implicit measures. Implicit affect was assessed using the Implicit Positive and Negative Affect Test, and implicit negative memory bias was assessed with the word fragment completion tasks. In 55 healthy participants, we measured subjective stress levels, worries, implicit and explicit affect each hour during waking hours. Also, saliva samples were collected at three fixed times during the day, as well as upon waking and 30 minutes thereafter (cortisol awakening response. Multilevel analyses of the daytime cortisol levels revealed that the presence of an implicit negative memory bias was associated with increased cortisol levels. Additionally, implicit PA and, unexpectedly, implicit NA were negatively associated with cortisol levels. Finally, participants demonstrating higher levels of implicit sadness during the first measurement day, had a stronger cortisol rise upon awakening at the next day. Contrary to previous research, no associations between explicit affect and cortisol were apparent. The current study was the first to examine the concurrent relation between implicit measures and stress physiology in daily life. The results suggest that the traditional focus on consciously reported feelings and emotions is limited, and that implicit measures can add to our understanding of how stress and emotions contribute to daily physiological activity and, in the long term, health problems.

  16. Soccer athletes are superior to non-athletes at perceiving soccer-specific and non-sport specific human biological motion

    OpenAIRE

    Thomas eRomeas; Jocelyn eFaubert

    2015-01-01

    Recent studies have shown that athletes’ domain specific perceptual-cognitive expertise can transfer to everyday tasks. Here we assessed the perceptual-cognitive expertise of athletes and non-athletes using sport specific and non-sport specific biological motion perception tasks. Using a virtual environment, university-level soccer players and university students’ non-athletes were asked to perceive the direction of a point-light walker and to predict the trajectory of a masked-ball during a ...

  17. Dizziness and Motion Sickness

    Science.gov (United States)

    ... ENTCareers Marketplace Find an ENT Doctor Near You Dizziness and Motion Sickness Dizziness and Motion Sickness Patient ... vision or speech, or hearing loss. What is dizziness? Dizziness can be described in many ways, such ...

  18. Age-specific differences between conventional and ambulatory daytime blood pressure values

    DEFF Research Database (Denmark)

    Conen, David; Aeschbacher, Stefanie; Thijs, Lutgarde;

    2014-01-01

    Mean daytime ambulatory blood pressure (BP) values are considered to be lower than conventional BP values, but data on this relation among younger individuals individuals not taking antihypertensive treatment from 13...... population-based cohorts. We compared individual differences between daytime ambulatory and conventional BP according to 10-year age categories. Age-specific prevalences of white coat and masked hypertension were calculated. Among individuals aged 18 to 30, 30 to 40, and 40 to 50 years, mean daytime BP...... was significantly higher than the corresponding conventional BP (6.0, 5.2, and 4.7 mm Hg for systolic; 2.5, 2.7, and 1.7 mm Hg for diastolic BP; all Pindividuals aged 60 to 70 and ≥70 years, conventional BP was significantly higher than daytime ambulatory BP (5.0 and 13.0 mm Hg for systolic; 2.0 and 4...

  19. Exploring the link between ambulatory care and avoidable hospitalizations at the Veteran Health Administration.

    Science.gov (United States)

    Pracht, Etienne E; Bass, Elizabeth

    2011-01-01

    This paper explores the link between utilization of ambulatory care and the likelihood of rehospitalization for an avoidable reason in veterans served by the Veteran Health Administration (VA). The analysis used administrative data containing healthcare utilization and patient characteristics stored at the national VA data warehouse, the Corporate Franchise Data Center. The study sample consisted of 284 veterans residing in Florida who had been hospitalized at least once for an avoidable reason. A bivariate probit model with instrumental variables was used to estimate the probability of rehospitalization. Veterans who had at least 1 ambulatory care visit per month experienced a significant reduction in the probability of rehospitalization for the same avoidable hospitalization condition. The findings suggest that ambulatory care can serve as an important substitute for more expensive hospitalization for the conditions characterized as avoidable.

  20. Office, ambulatory and home blood pressure measurement in children and adolescents.

    Science.gov (United States)

    Karpettas, Nikos; Kollias, Anastasios; Vazeou, Andriani; Stergiou, George S

    2010-11-01

    There is an increasing interest in pediatric hypertension, the prevalence of which is rising in parallel with the obesity epidemic. Traditionally the assessment of hypertension in children has relied on office blood pressure (BP) measurements by the physician. However, as in adults, office BP might be misleading in children mainly due to the white coat and masked hypertension phenomena. Thus, out-of-office BP assessment, using ambulatory or home monitoring, has gained ground for the accurate diagnosis of hypertension and decision-making. Ambulatory monitoring is regarded as indispensable for the evaluation of pediatric hypertension. Preliminary data support the usefulness of home monitoring, yet more evidence is needed. Office, ambulatory and home BP normalcy tables providing thresholds for diagnosis have been published and should be used for the assessment of elevated BP in children.

  1. Ambulatory electroencephalogram in children: A prospective clinical audit of 100 cases

    Directory of Open Access Journals (Sweden)

    Nahin Hussain

    2013-01-01

    Full Text Available Ambulatory electroencephalogram has been used for differentiating epileptic from nonepileptic events, recording seizure frequency and classification of seizure type. We studied 100 consecutive children prospectively aged 11 days to 16 years that were referred for an ambulatory electroencephalogram to a regional children′s hospital. Ambulatory electroencephalogram was clinically useful in contributing to a clinical diagnosis in 71% of children who were referred with a range of clinical questions. A diagnosis of epileptic disorder was confirmed by obtaining an ictal record in 26% and this included 11 children that had previously normal awake and or sleep electroencephalogram. We recommend making a telephone check of the current target event frequency and prioritising those with typical events on most days in order to improve the frequency of recording a typical attack.

  2. Blood pressure variability in relation to outcome in the International Database of Ambulatory blood pressure in relation to Cardiovascular Outcome

    DEFF Research Database (Denmark)

    Stolarz-Skrzypek, Katarzyna; Thijs, Lutgarde; Richart, Tom

    2010-01-01

    Ambulatory blood pressure (BP) monitoring provides information not only on the BP level but also on the diurnal changes in BP. In the present review, we summarized the main findings of the International Database on Ambulatory BP in relation to Cardiovascular Outcome (IDACO) with regard to risk...

  3. Knee Muscle Strength at Varying Angular Velocities and Associations with Gross Motor Function in Ambulatory Children with Cerebral Palsy

    Science.gov (United States)

    Hong, Wei-Hsien; Chen, Hseih-Ching; Shen, I-Hsuan; Chen, Chung-Yao; Chen, Chia-Ling; Chung, Chia-Ying

    2012-01-01

    The aim of this study was to evaluate the relationships of muscle strength at different angular velocities and gross motor functions in ambulatory children with cerebral palsy (CP). This study included 33 ambulatory children with spastic CP aged 6-15 years and 15 children with normal development. Children with CP were categorized into level I (n =…

  4. Early detection and treatment of myocardial ischaemia after operation using continual ambulatory arterial pressure monitoring and ECG ST segment analysis.

    Science.gov (United States)

    Edwards, N D; Troy, G; Yeo, W; Jackson, P; Reilly, C S

    1995-10-01

    We report a case in which the use of continual ambulatory arterial pressure monitoring and ECG ST-segment analysis allowed early detection and treatment of myocardial ischaemia in the postoperative period. We believe that this case illustrates the potential value of ambulatory monitoring in the early postoperative period in high-risk patients.

  5. The Role of Ambulatory Care Pharmacists in an HIV Multidisciplinary Team within a Free and Bilingual Clinic

    Directory of Open Access Journals (Sweden)

    Ann M. Fugit, Pharm.D., BCPS

    2013-01-01

    Full Text Available Objective: Describe the role and integration of ambulatory care pharmacists in a Human Immunodeficiency Virus (HIV clinic within a free and bilingual clinic with regards to types of interventions made during the patient-pharmacist visit. Design: Retrospective, single-centered, chart review. Setting: Free, bilingual clinic in Richmond, VA. Participants: Thirty-two adult patients with diagnosed HIV receiving care in the clinic between June 30, 2010 and January 26, 2011. Main Outcome Measure: Types of interventions documented during the patient-pharmacist visit, categorized as medication review, patient education, or adherence monitoring. Results: Total of 32 patients accounted for 55 patient-pharmacist visits and 296 interventions. The most common interventions were medication review (66.9%, patient education (23.3%, and adherence monitoring (9.8%. Post-hoc analysis suggests Hispanic patients are more likely to be diagnosed with Acquired Immune Deficiency Syndrome (AIDS (P = 0.01, have current or history of opportunistic infection (OI (P=0.01, and have current or history of OI prophylaxis (P = 0.03. Adherence monitoring was less common amongst the non-Hispanics (7.1% compared to the Hispanic sub-population (16.5%, (P = 0.04. Conclusion: The role of ambulatory care pharmacists in a free and bilingual clinic goes beyond adherence monitoring. Pharmacists can be a valuable part of the patient care team by providing medication review and patient education for HIV and other co-morbidities within free clinics. Further research is warranted to assess outcomes and to further explore the underlying barriers to early HIV diagnosis and adherence within the Hispanic population.

  6. Temporal characteristics of neuronal sources for implied motion perception

    NARCIS (Netherlands)

    Lorteije, J.A.M.; Kenemans, J.L.; Jellema, T.; Lubbe, R.H.J. van der; Heer, F. de; Wezel, R.J.A. van

    2004-01-01

    Viewing photographs of objects in motion evokes higher fMRI activation in human MT+ than similar photographs without this implied motion. MT+ is traditionally considered to be involved in motion perception. Therefore, this finding suggests feedback from object-recognition areas to MT+. To investigat

  7. Diagnósticos de enfermagem em pacientes com o Vírus da Imunodeficiência Humana/ Síndrome da Imunodeficiência Adquirida em assistência ambulatorial Diagnósticos de enfermería en pacientes con el Virus de la Inmunodeficiencia Humana/Síndrome de la Inmunodeficiencia Adquirida en asistencia de ambulatorio Nursing diagnoses in patients with Human Immunodeficiency Virus/Acquired Immunodeficiency Syndrome in outpatient care

    Directory of Open Access Journals (Sweden)

    Gilmara Holanda da Cunha

    2010-01-01

    Full Text Available OBJETIVO: Identificar diagnósticos de enfermagem em portadores de Vírus da Imunodeficiência Humana/ Síndrome da Imunodeficiência Adquirida (HIV/AIDS em assistência ambulatorial. MÉTODOS: Estudo transversal e descritivo realizado por meio da aplicação de um questionário com referencial na Teoria do Autocuidado de Orem. A amostra foi de 51 pacientes atendidos no ambulatório de um hospital público na cidade de Fortaleza-CE. RESULTADOS: Foram identificados 17 diagnósticos de enfermagem, destacando-se risco de infecção, disfunção sexual, déficit no autocuidado para alimentação e controle ineficaz do regime terapêutico. CONCLUSÃO: Os diagnósticos de enfermagem obtidos identificaram os principais problemas apresentados pelos portadores de HIV/AIDS, verificando déficits no autocuidado e em educação em saúde. O estudo contribuiu para que as intervenções de enfermagem sejam adequadas e direcionadas às necessidades existentes.OBJETIVO: Identificar diagnósticos de enfermería en portadores del Virus de la Inmunodeficiencia Humana/Síndrome de la Inmunodeficiencia Adquirida (HIV/SIDA en asistencia de ambulatorio. MÉTODOS: Estudio transversal y descriptivo realizado por medio de la aplicación de un cuestionario basado en la Teoría del Auto-cuidado de Orem. La muestra fue de 51 pacientes atendidos en el ambulatorio de un hospital público en la ciudad de Fortaleza-CE. RESULTADOS: Fueron identificados 17 diagnósticos de enfermería, destacándose: riesgo de infección, disfunción sexual, déficit en el auto-cuidado para alimentación y control ineficaz del régimen terapéutico. CONCLUSIÓN: Los diagnósticos de enfermería obtenidos identificaron los principales problemas presentados por los portadores de HIV/SIDA, verificándose déficits en el auto-cuidado y en la educación en salud. El estudio contribuye para que las intervenciones de enfermería sean adecuadas y dirigidas a las necesidades existentes.OBJECTIVE: To

  8. Objects in Motion

    Science.gov (United States)

    Damonte, Kathleen

    2004-01-01

    One thing scientists study is how objects move. A famous scientist named Sir Isaac Newton (1642-1727) spent a lot of time observing objects in motion and came up with three laws that describe how things move. This explanation only deals with the first of his three laws of motion. Newton's First Law of Motion says that moving objects will continue…

  9. Strategies for classifying patients based on office, home, and ambulatory blood pressure measurement.

    Science.gov (United States)

    Zhang, Lu; Li, Yan; Wei, Fang-Fei; Thijs, Lutgarde; Kang, Yuan-Yuan; Wang, Shuai; Xu, Ting-Yan; Wang, Ji-Guang; Staessen, Jan A

    2015-06-01

    Hypertension guidelines propose home or ambulatory blood pressure monitoring as indispensable after office measurement. However, whether preference should be given to home or ambulatory monitoring remains undetermined. In 831 untreated outpatients (mean age, 50.6 years; 49.8% women), we measured office (3 visits), home (7 days), and 24-h ambulatory blood pressures. We applied hypertension guidelines for cross-classification of patients into normotension or white-coat, masked, or sustained hypertension. Based on office and home blood pressures, the prevalence of white-coat, masked, and sustained hypertension was 61 (10.3%), 166 (20.0%), and 162 (19.5%), respectively. Using daytime (from 8 am to 6 pm) instead of home blood pressure confirmed the cross-classification in 575 patients (69.2%), downgraded risk from masked hypertension to normotension (n=24) or from sustained to white-coat hypertension (n=9) in 33 (4.0%), but upgraded risk from normotension to masked hypertension (n=179) or from white-coat to sustained hypertension (n=44) in 223 (26.8%). Analyses based on 24-h ambulatory blood pressure were confirmatory. In adjusted analyses, both the urinary albumin-to-creatinine ratio (+20.6%; confidence interval, 4.4-39.3) and aortic pulse wave velocity (+0.30 m/s; confidence interval, 0.09-0.51) were higher in patients who moved up to a higher risk category. Both indexes of target organ damage and central augmentation index were positively associated (P≤0.048) with the odds of being reclassified. In conclusion, for reliably diagnosing hypertension and starting treatment, office measurement should be followed by ambulatory blood pressure monitoring. Using home instead of ambulatory monitoring misses the high-risk diagnoses of masked or sustained hypertension in over 25% of patients.

  10. A review on epilepsy in the horse and the potential of Ambulatory EEG as a diagnostic tool.

    Science.gov (United States)

    van der Ree, Marleen; Wijnberg, Inge

    2012-01-01

    Epilepsy in the horse is diagnosed based on clinical signs, but diagnosing can be difficult if a grand mal is not present. The future prospects of the horse and potentially the safety of the owner depend on an accurate diagnosis. This review presents information on epilepsy and focuses on the diagnostic potential of (Ambulatory) electroencephalography ((A) EEG). An epileptic seizure is a brain disorder, which expresses itself as a recurrent episode of involuntary abnormal behaviour. The aetiology can originate from inside or outside the brain or is idiopathic. Besides those categories, seizures can be classified as generalised or partial. A typical generalised tonic-clonic seizure is characterised by the prodrome, the ictus and the post-ictal phase. EEG is the graphic recording of rhythmic bioelectric activity which originates predominantly from the cerebral cortex. In human medicine, the 10/20 international basis system for electrode placement is used. This makes comparison more reliable and consistent. The normal human brainwaves recorded are alpha, beta, theta and delta waves. In the horse, fewer descriptions of normal signals are available. In humans suffering from epilepsy, spikes, complexes, spike-and-wave discharges and rhythmical multi-spike activity are seen. In horses suffering from epilepsy, spikes, sharp waves and spike-and-wave discharges are seen. In humans, AEEG has numerous advantages above short-duration EEG in diagnosing epilepsy or intracranial pathology. In future, AEEG might be useful to record brain signals in awake horses expressing their behaviour under natural circumstances.

  11. Exit from Synchrony in Joint Improvised Motion

    Science.gov (United States)

    Dahan, Assi; Noy, Lior; Hart, Yuval; Mayo, Avi; Alon, Uri

    2016-01-01

    Motion synchrony correlates with effective and well-rated human interaction. However, people do not remain locked in synchrony; Instead, they repeatedly enter and exit synchrony. In many important interactions, such as therapy, marriage and parent-infant communication, it is the ability to exit and then re-enter synchrony that is thought to build strong relationship. The phenomenon of entry into zero-phase synchrony is well-studied experimentally and in terms of mathematical modeling. In contrast, exit-from-synchrony is under-studied. Here, we focus on human motion coordination, and examine the exit-from-synchrony phenomenon using experimental data from the mirror game paradigm, in which people perform joint improvised motion, and from human tracking of computer-generated stimuli. We present a mathematical mechanism that captures aspects of exit-from-synchrony in human motion. The mechanism adds a random motion component when the accumulated velocity error between the players is small. We introduce this mechanism to several models for human coordinated motion, including the widely studied HKB model, and the predictor-corrector model of Noy, Dekel and Alon. In all models, the new mechanism produces realistic simulated behavior when compared to experimental data from the mirror game and from tracking of computer generated stimuli, including repeated entry and exit from zero-phase synchrony that generates a complexity of motion similar to that of human players. We hope that these results can inform future research on exit-from-synchrony, to better understand the dynamics of coordinated action of people and to enhance human-computer and human-robot interaction. PMID:27711185

  12. [Present and future ambulatory nursing care in Switzerland: what general practitioners should know].

    Science.gov (United States)

    Weber-Yaskevich, Olga; Reber, Alexandra; Gillabert, Cédric

    2011-09-28

    In response to the ambulatorization of medical care, the panel of ambulatory nursing medical care is operating important changes. Since 2011, "acute and transitional medical care" is being prescribed by hospital practitioners, implying a new definition of the nurse's profession. The consequence is more complex and more autonomous nursing care: an academic formation has been created for nurses (bachelor and master) and their assistants (healthcare and community assistants). The futur will probably be made of ambulatory case management by nurses (advanced nurse practictioner). General practictioners will not only collaborate with the nurses but also assign them with tasks handled until then by themselves, prescribing, among other things, domiciliary "long-term" medical care.

  13. The Anxiolytic Effect of Aromatherapy on Patients Awaiting Ambulatory Surgery: A Randomized Controlled Trial

    Directory of Open Access Journals (Sweden)

    Cheng-Hua Ni

    2013-01-01

    Full Text Available The aim of this study was to determine if aromatherapy could reduce preoperative anxiety in ambulatory surgery patients. A total of 109 preoperative patients were randomly assigned to experimental (bergamot essential oil and control (water vapor conditions and their responses to the State Trait Anxiety Inventory and vital signs were monitored. Patients were stratified by previous surgical experience, but that did not influence the results. All those exposed to bergamot essential oil aromatherapy showed a greater reduction in preoperative anxiety than those in the control groups. Aromatherapy may be a useful part of a holistic approach to reducing preoperative anxiety before ambulatory surgery.

  14. Transient myocardial ischaemia during ambulatory monitoring out of hospital in patients with chronic stable angina pectoris

    DEFF Research Database (Denmark)

    Egstrup, K

    1988-01-01

    Transient myocardial ischaemia during daily life, detected by ambulatory electrocardiographic monitoring, was investigated in 42 patients with chronic stable angina and documented coronary artery disease. Ambulatory monitoring was initiated for 36 hours after all prophylactic antianginal medication...... had been withdrawn for 5 days. There were 196 episodes of ST-segment depression, 145 (74%) of which were not accompanied by angina. As well, a tendency to more prolonged and greater ST-segment change with symptomatic ischaemic episodes was noted. A diurnal variation in transient ischaemia both...

  15. MOTIVATIONS OF RENAL PATIENT TO CHOOSE THE CONTINUUM AMBULATORIAL PERITONEAL DIALISE

    Directory of Open Access Journals (Sweden)

    Maria Josefina da Silva

    2003-06-01

    Full Text Available The renal disease imposes to its porter a new conception due. Nowadays, modern techniques, makepossible more freedom to the client, being one of them, continuum Dialise peritoneal ambulatorial. Our objective isto study the election by the method and the feelings related to this chose by the client. We conclude that thermethod, despite its advantages, is not the first option yet, the patient, in some cases are not well trained withintercorrences, but most of them are satisfied with the chose. The nursing still participates just a bit of this processbut it has important role in the ambulatorial and domiciliar attendance of this client, needing more specificformation.

  16. Ambulatory hysteroscopy and its role in the management of abnormal uterine bleeding.

    Science.gov (United States)

    Cooper, Natalie A M; Robinson, Lynne L L; Clark, T Justin

    2015-10-01

    Hysteroscopy is now an ambulatory procedure, having moved from a conventional day-case operating theatre environment to the outpatient clinic setting. Outpatient hysteroscopy can be used as a diagnostic test and as a therapeutic modality for women presenting with abnormal uterine bleeding. In many cases women can be diagnosed and treated efficiently during a single hospital appointment. This article reviews the development of ambulatory hysteroscopy and how it should optimally be performed and implemented. The contemporary role of this technology for investigating and treating women with abnormal uterine bleeding is then discussed.

  17. Modeling repetitive motions using structured light.

    Science.gov (United States)

    Xu, Yi; Aliaga, Daniel G

    2010-01-01

    Obtaining models of dynamic 3D objects is an important part of content generation for computer graphics. Numerous methods have been extended from static scenarios to model dynamic scenes. If the states or poses of the dynamic object repeat often during a sequence (but not necessarily periodically), we call such a repetitive motion. There are many objects, such as toys, machines, and humans, undergoing repetitive motions. Our key observation is that when a motion-state repeats, we can sample the scene under the same motion state again but using a different set of parameters; thus, providing more information of each motion state. This enables robustly acquiring dense 3D information difficult for objects with repetitive motions using only simple hardware. After the motion sequence, we group temporally disjoint observations of the same motion state together and produce a smooth space-time reconstruction of the scene. Effectively, the dynamic scene modeling problem is converted to a series of static scene reconstructions, which are easier to tackle. The varying sampling parameters can be, for example, structured-light patterns, illumination directions, and viewpoints resulting in different modeling techniques. Based on this observation, we present an image-based motion-state framework and demonstrate our paradigm using either a synchronized or an unsynchronized structured-light acquisition method.

  18. Rolling Shutter Motion Deblurring

    KAUST Repository

    Su, Shuochen

    2015-06-07

    Although motion blur and rolling shutter deformations are closely coupled artifacts in images taken with CMOS image sensors, the two phenomena have so far mostly been treated separately, with deblurring algorithms being unable to handle rolling shutter wobble, and rolling shutter algorithms being incapable of dealing with motion blur. We propose an approach that delivers sharp and undis torted output given a single rolling shutter motion blurred image. The key to achieving this is a global modeling of the camera motion trajectory, which enables each scanline of the image to be deblurred with the corresponding motion segment. We show the results of the proposed framework through experiments on synthetic and real data.

  19. Bacteriemia por Chryseobacterium indologenes em diabético em hemodiálise ambulatorial Bacteremia by Chryseobacterium indologenes in a diabetic patient undergoing ambulatory hemodialysis

    Directory of Open Access Journals (Sweden)

    Marcus Machado Ramos Souza de Souza

    2012-02-01

    Full Text Available Chryseobacterium indologenes é uma bactéria de baixa virulência, encontrada no meio ambiente, raramente associada às infecções não hospitalares. A maioria das infecções causadas por ela associa-se ao uso de dispositivos invasivos durante a permanência em hospital. O presente relato trata de paciente renal crônico, diabético, apresentando episódios de bacteriemia durante sessões de hemodiálise ambulatorial por meio de cateter permcath.Chryseobacterium indologenes is a low-virulent bacterium found in the environment, which is rarely associated with non-nosocomial infections. Most infections caused by this pathogen are associated with the use of invasive devices in hospitalized patients. This study reports the case of a diabetic patient with chronic renal disease presenting episodes of bacteremia undergoing ambulatory hemodialysis with permcath catheter.

  20. Structural motion engineering

    CERN Document Server

    Connor, Jerome

    2014-01-01

    This innovative volume provides a systematic treatment of the basic concepts and computational procedures for structural motion design and engineering for civil installations. The authors illustrate the application of motion control to a wide spectrum of buildings through many examples. Topics covered include optimal stiffness distributions for building-type structures, the role of damping in controlling motion, tuned mass dampers, base isolation systems, linear control, and nonlinear control. The book's primary objective is the satisfaction of motion-related design requirements, such as restrictions on displacement and acceleration. The book is ideal for practicing engineers and graduate students. This book also: ·         Broadens practitioners' understanding of structural motion control, the enabling technology for motion-based design ·         Provides readers the tools to satisfy requirements of modern, ultra-high strength materials that lack corresponding stiffness, where the motion re...

  1. Ultrasonic range measurements on the human body

    NARCIS (Netherlands)

    Weenk, D.; Beijnum, van B.J.F.; Droog, A.; Hermens, H.J.; Veltink, P.H.

    2013-01-01

    Ambulatory range estimation on the human body is important for the assessment of the performance of upper- and lower limb tasks outside a laboratory. In this paper an ultrasound sensor for estimating ranges on the human body is presented and validated during gait. The distance between the feet is e

  2. The Analysis of Human Motion Capture and Model of Semantic Interpretation Based on Kinect%基于kinect的人体动作捕捉与模式语义解读分析

    Institute of Scientific and Technical Information of China (English)

    肖何; 刘建明

    2015-01-01

    Kinect人体动作捕捉系统从字面上就可以看出,它的核心就是Kinect体感摄影机,对人体的动作、人脸表情以及人体动作姿势进行检测捕捉的技术,这项技术不但能使运行效果达到很好,也使开发效率大大提高,与此同时也降低了开发成本,使它们三者之间达到最优平衡。在Kinece核心基础上,另外与3DMAX和开放源代码结合,设计了这款系统,具有硬件简单性、廉价性、高精度性以及实时性等优点,能够应用的领域非常广泛,下面我们就来了解kinect的人体动作捕捉系统。%Kinect human body motion capture system can see literally,The core is the Kinect body and its sense of camera,On the human body movements, facial expression and action of human posture detection capture technology,The technology not only can make the operating effect to achieve very good, also make the development efficiency is greatly improved, at the same time also re⁃duces the development cost, to achieve the optimal balance between these three aspects. In the core based on Kinece, also in con⁃junction with the 3DMAX and open source code, the design of this system, it has simple hardware, cheap, high precision and real-time advantages, can be used widely in many fields, Here we come to understand the human motion capture system in kinect.

  3. A Real-Time Pinch-to-Zoom Motion Detection by Means of a Surface EMG-Based Human-Computer Interface

    Directory of Open Access Journals (Sweden)

    Jongin Kim

    2014-12-01

    Full Text Available In this paper, we propose a system for inferring the pinch-to-zoom gesture using surface EMG (Electromyography signals in real time. Pinch-to-zoom, which is a common gesture in smart devices such as an iPhone or an Android phone, is used to control the size of images or web pages according to the distance between the thumb and index finger. To infer the finger motion, we recorded EMG signals obtained from the first dorsal interosseous muscle, which is highly related to the pinch-to-zoom gesture, and used a support vector machine for classification between four finger motion distances. The powers which are estimated by Welch’s method were used as feature vectors. In order to solve the multiclass classification problem, we applied a one-versus-one strategy, since a support vector machine is basically a binary classifier. As a result, our system yields 93.38% classification accuracy averaged over six subjects. The classification accuracy was estimated using 10-fold cross validation. Through our system, we expect to not only develop practical prosthetic devices but to also construct a novel user experience (UX for smart devices.

  4. A real-time pinch-to-zoom motion detection by means of a surface EMG-based human-computer interface.

    Science.gov (United States)

    Kim, Jongin; Cho, Dongrae; Lee, Kwang Jin; Lee, Boreom

    2014-12-29

    In this paper, we propose a system for inferring the pinch-to-zoom gesture using surface EMG (Electromyography) signals in real time. Pinch-to-zoom, which is a common gesture in smart devices such as an iPhone or an Android phone, is used to control the size of images or web pages according to the distance between the thumb and index finger. To infer the finger motion, we recorded EMG signals obtained from the first dorsal interosseous muscle, which is highly related to the pinch-to-zoom gesture, and used a support vector machine for classification between four finger motion distances. The powers which are estimated by Welch's method were used as feature vectors. In order to solve the multiclass classification problem, we applied a one-versus-one strategy, since a support vector machine is basically a binary classifier. As a result, our system yields 93.38% classification accuracy averaged over six subjects. The classification accuracy was estimated using 10-fold cross validation. Through our system, we expect to not only develop practical prosthetic devices but to also construct a novel user experience (UX) for smart devices.

  5. Adesão de pacientes HIV positivos à dietoterapia ambulatorial Adherence of positive HIV patients to ambulatory diet therapy

    Directory of Open Access Journals (Sweden)

    Késia Diego Quintaes

    1999-08-01

    Full Text Available É conhecida a importância do estado nutricional para a evolução clínica de pacientes HIV positivos. Entretanto, é desconhecida a expectativa do paciente com relação à dietoterapia. Por um período de 30 semanas foram acompanhados 50,0% dos pacientes HIV positivo (grupos II e IV atendidos pelo ambulatório de Doenças Sexualmente Transmissíveis do Hospital e Maternidade Celso Pierro. Neste período foram realizadas duas entrevistas, sendo o intervalo entre elas de 10 semanas. Na primeira foram colhidos dados socioeconômicos, antropométricos, verificadas as modificações voluntárias feitas na alimentação e também a expectativa do paciente quanto a este tipo de tratamento. Na segunda foram colhidos indicadores diretos e indiretos de adesão ao tratamento. A adesão foi maior entre os pacientes do grupo IV (64,7% do que entre os do grupo II (35,3%. No entanto, 81,3% dos pacientes do grupo II, após tomarem conhecimento da sorologia positiva para HIV, modificaram voluntariamente sua alimentação, demostrando ser este um importante período para sensibilização do paciente para o tratamento.It's well known the importance of nutritional status to the clinical evolution of positive HIV patients. However, the patient expectation in relation to diet therapy is unknown. During 30 weeks, 50.0% of the patients HIV positive (groups II and IV attended by the ambulatory of Sexually Transmitted Diseases of Hospital and Maternity Celso Pierro, were interviewed. In this period two interviews with an interval of ten weeks were carried out. At the first one socioeconomic and anthropometric data were collected voluntary feeding modifications and also the patient expectation about such treatment were verified. At the second one, direct and indirect indicators of the adherence to treatment were colleded. The adherence was greater in pacients of group IV (64.7% than in group II (35.3%. However, 81.3% of the patients from group II, after being aware

  6. 一种基于加速度信息的上肢动作识别研究方法%A Research Method of Human Upper Limb Motion Recognition Based on Acceleration Signal

    Institute of Scientific and Technical Information of China (English)

    洪俊; 赵子恺

    2014-01-01

    A new method of binary decision analysis based GM threshold was proposed,applying to the research on recognition of human upper limb motion.The human motion acceleration acquisition system was designed,based on selection of the MEMS triaxial acceleration sensor ADXL345 .Through defined types of actions to do experiments,after obtained the three dimensional (3-D)acceler-ation signal of the body to perform upper limb actions,first the wavelet threshold denoising was preprocessed,extracting the Geometric Mean (GM)of upper limb actions as feature to select threshold.The experimental results show that,combined with wavelet analysis theory,this method based on GM threshold achieves the recognition of the type of action of the human upper limb,and validates the simplicity and efficiency of the system design and the theoretical algorithms,which has some reference value to research on human mo-tion recognition based on acceleration sensor.%提出一种基于GM阈值的二叉判决分析法,应用于人体上肢动作的分类识别研究。选用ME MS三轴加速度传感器ADXL345,设计一套人体动作的加速度采集系统。自定义上肢动作进行实验,采集人体执行上肢动作时的三维加速度信号后,进行小波阈值去噪的预处理过程,提取上肢动作的几何均值GM (Geometric Mean)作为特征值进行阈值的选取。实验结果表明:结合小波分析理论方法,基于GM阈值的方法实现了人体上肢动作的分类识别,并验证了系统设计及理论算法的简便性、高效性,对基于加速度传感器的动作识别研究具有一定的参考价值。

  7. Estimating qualitative parameters for assessment of body balance in a simulated ambulatory setting

    NARCIS (Netherlands)

    Meulen, van Fokke B.; Reenalda, Jasper; Veltink, Peter H.

    2013-01-01

    Continuous daily-life monitoring of balance control of stroke survivors in an ambulatory setting, is essential for optimal guidance of rehabilitation. The purpose of this study is to demonstrate the relation between qualitative parameters of body balance while measuring in stroke patients in a simul

  8. Treatment goals for ambulatory blood pressure and plasma lipids after stroke are often not reached

    DEFF Research Database (Denmark)

    Engberg, Aase Worså; Kofoed, Klaus

    2013-01-01

    In Danish health care, secondary prevention after stroke is currently handled mainly by general practitioners using office blood pressure (OBP) assessment of hypertension. The aim of this study was to compare the OBP approach to 24-hour assessment by ambulatory blood pressure (ABP) monitoring....... Furthermore, we aimed to record the degree of adherence to recommended therapy goals for blood pressure and plasma lipids....

  9. Effects of an isocaloric healthy Nordic diet on ambulatory blood pressure in metabolic syndrome

    DEFF Research Database (Denmark)

    Brader, L; Uusitupa, M; Dragsted, Lars Ove

    2013-01-01

    beneficial effects on ambulatory BP in subjects with metabolic syndrome (MetS).Subjects/methods:In total, 37 subjects were randomized to either a healthy Nordic diet or a control diet. A healthy Nordic diet embraced whole grains, rapeseed oil, berries, fruits, vegetables, fish, nuts and low-fat dairy...

  10. Evaluation of a Professional Practice Model in the Ambulatory Care Setting

    Science.gov (United States)

    2014-03-10

    patient satisfaction , nurse -sensitive indicators of quality care as measured by...Project Number: N10-C04 Aim one Evaluate levels of nursing and patient satisfaction in ambulatory care clinics following implementation of a...Clarke, S.P., Sloane, D., Lake, E.T., Cheney, T. (2008). Effects of hospital care environment on patient mortality and nurse outcomes. Journal of Nursing

  11. Temporal changes in clinic and ambulatory blood pressure during cyclic post-menopausal hormone replacement therapy

    DEFF Research Database (Denmark)

    Sørensen, M B; Rasmussen, Verner; Jensen, Gorm Boje

    2000-01-01

    cyclic norethisterone acetate (NETA) or placebo in two 12-week periods separated by a 3-month washout Clinic blood pressure was measured sitting by the same observer with a mercury manometer at four visits in each period. Twenty-four hour ambulatory blood pressure was measured at baseline...

  12. Association between endothelial dysfunction and arterial stiffness in continuous ambulatory peritoneal dialysis patients

    Institute of Scientific and Technical Information of China (English)

    顾玥

    2014-01-01

    Objective To investigate the association between endothelial dysfunction and arterial stiffness in continuous ambulatory peritoneal dialysis(CAPD)patients.Methods Ninety-four stable CAPD patients from a single center were enrolled in this cross-sectional study.Ultrasound evaluation was conducted on brachial artery to estimate endothelial-dependent

  13. Hospital admissions due to ambulatory care sensitive conditions among children by age group and health region

    Directory of Open Access Journals (Sweden)

    Kelly Holanda Prezotto

    2015-02-01

    Full Text Available OBJECTIVE to describe hospital admissions for ambulatory care sensitive conditions in children under five years of age in the State of Paraná, Brazil by condition type, age group and health region. METHOD a temporal ecological study was conducted using data from the Unified Health System Hospital Information System for the period 2000 to 2011. Conditions were grouped in accordance with the list of ambulatory care sensitive conditions in Brazil. RESULTS there was an increase in the rate of admissions for ambulatory care sensitive conditions in all age groups in 50% of the health regions, with a marked increase in children under the age of one. Pneumonia, gastroenteritis and asthma were the main causes of admissions. There was an increase in the proportion of overall admissions accounted for by pneumonia and gastroenteritis. CONCLUSION the increase in admissions reveals the need for actions to improve access to primary healthcare and provide effective treatment of the main ambulatory care sensitive conditions in order to prevent hospital admissions among children.

  14. The comparison of two analgesic regimes after ambulatory surgery: an observational study

    NARCIS (Netherlands)

    Worp, F. van der; Stapel, J.T.; Lako, S.J.; Hendriks, J.C.M.; Vissers, K.C.P.; Steegers, M.A.H.

    2014-01-01

    INTRODUCTION: Over the past 15 years, the number of ambulatory surgical procedures worldwide has increased continuously. Studies show that 30% to 40% of the patients experience moderate-to-severe pain in the first 48 hours. The objective of this observational study is to compare the percentage of mo

  15. Perceived Racism and Ambulatory Blood Pressure in African American College Students

    Science.gov (United States)

    Hill, LaBarron K.; Kobayashi, Ihori; Hughes, Joel W.

    2007-01-01

    Experiences with racial discrimination may contribute to stress-induced blood pressure (BP) elevations among African Americans. It was reported that perceived racism was associated with ambulatory BP (ABP) during waking hours. This study examined perceived racism and ABP among 40 African American college students, who completed an ABP assessment…

  16. A 15-year longitudinal study on ambulatory blood pressure tracking from childhood to early adulthood

    NARCIS (Netherlands)

    Li, Zhibin; Snieder, Harold; Harshfield, Gregory A.; Treiber, Frank A.; Wang, Xiaoling

    2009-01-01

    This study evaluates the tracking stability of office blood pressure (BP), ambulatory BP (ABP), BP variability (BPV) and nocturnal BP drops (dipping) from childhood to early adulthood, and their dependence on ethnicity, gender and family history (FH) of essential hypertension (EH). Generalized estim

  17. RELATIONSHIP BETWEEN BLOOD-PRESSURE DURING HEMODIALYSIS AND AMBULATORY BLOOD-PRESSURE IN BETWEEN DIALYSES

    NARCIS (Netherlands)

    HUISMAN, RM; DEBRUIN, C; KLONT, D; SMIT, AJ

    1995-01-01

    Background. Ambulatory blood pressure measurements in haemodialysis patients are relevant in view of the high cardiovascular morbidity and mortality in chronic haemodialysis patients. Methods. Twelve normotensive patients were studied from the beginning of one dialysis until the end of the next (mea

  18. Staphylococcus Aureus Nasal Carriage and Infection in Patients on Continuous Ambulatory Peritoneal Dialysis

    NARCIS (Netherlands)

    M.A. Luzar; G.A. Coles; B. Faller; A. Slingeneyer; G. Dah Dah; C. Briat; C. Wone; Y. Knefati; M. Kessler; F. Peluso

    1990-01-01

    textabstractWe studied 140 consecutive patients beginning continuous ambulatory peritoneal dialysis (CAPD) at one of seven hospitals to assess the relation of the nasal carriage of Staphylococcus aureus to subsequent catheter-exit-site infection or peritonitis. Shortly before the implantation of the

  19. Raoultella planticola peritonitis in a patient on continuous ambulatory peritoneal dialysis.

    Science.gov (United States)

    Kim, Sun Woo; Kim, Ji Eun; Hong, Yu Ah; Ko, Gang Jee; Pyo, Heui Jung; Kwon, Young Joo

    2015-12-01

    A 65-year-old man on continuous ambulatory peritoneal dialysis was admitted with peritonitis. Empirical antibiotic therapy was initiated, and Raoultella planticola was identified in the peritoneal fluid culture. We treated the patient with intraperitoneally administered ciprofloxacin and ceftazidime according to the antibiotic susceptibility. His condition improved, and he was well treated with a 2-week antibiotic course.

  20. Treatment goals for ambulatory blood pressure and plasma lipids after stroke are often not reached

    DEFF Research Database (Denmark)

    Engberg, Aase Worså; Kofoed, Klaus

    2013-01-01

    In Danish health care, secondary prevention after stroke is currently handled mainly by general practitioners using office blood pressure (OBP) assessment of hypertension. The aim of this study was to compare the OBP approach to 24-hour assessment by ambulatory blood pressure (ABP) monitoring. Fu....... Furthermore, we aimed to record the degree of adherence to recommended therapy goals for blood pressure and plasma lipids....

  1. Acceptance and side effects of ambulatory blood pressure monitoring: evaluation of a new technology.

    Science.gov (United States)

    Beltman, F W; Heesen, W F; Smit, A J; May, J F; Lie, K I; Meyboom-de Jong, B

    1996-09-01

    Ambulatory blood pressure (BP) monitoring is probably becoming a clinically useful procedure for the evaluation of hypertensive patients. Previous reports have shown that the devices are safe and serious side effects are rare. Discomfort and inconveniences associated with its use are more frequent. In this study, patient acceptance of ambulatory blood pressure monitoring (ABPM) was compared with acceptance of other diagnostic procedures and their side effects were assessed. Patients were asked to fill in a form and 129 of 166 patients responded. The acceptance was measured with a visual analogue scale which ranged from 'very annoying' on the left to 'not annoying at all' on the right. All forms were collected anonymously. Mean distance (cm) of the visual likert scale was 8.6 to 9.4 for the diagnostic procedures frequently used in routine patient care. Ambulatory BP measurement (ABPM) scored 6.1 cm. Reported side effects (in 27% of patients) were: plan (9%), skin irritation (8%), noisy device (8%), inconvenience with work (3%), haematoma (2%) and other (4%). Reports from the patients on sleep quality were: 23% normal, 61% minor disturbance, 14% had sleep, and 2% did not sleep at all. It can be concluded that ambulatory BP monitoring was the diagnostic procedure with the lowest patient acceptance. Side effects of this new technology were reported by 27% of patients. However, risks are relatively minor. Sleep disturbances were very frequent and was a serious problem for 16% of patients.

  2. Hospitalizations for ambulatory care-sensitive conditions, Minas Gerais, Southeastern Brazil, 2000 and 2010

    Directory of Open Access Journals (Sweden)

    Rita Maria Rodrigues-Bastos

    2014-12-01

    Full Text Available OBJECTIVE To analyze hospitalization rates and the proportion of deaths due to ambulatory care-sensitive hospitalizations and to characterize them according to coverage by the Family Health Strategy, a primary health care guidance program. METHODS An ecological study comprising 853 municipalities in the state of Minas Gerais, under the purview of 28 regional health care units, was conducted. We used data from the Hospital Information System of the Brazilian Unified Health System. Ambulatory care-sensitive hospitalizations in 2000 and 2010 were compared. Population data were obtained from the demographic censuses. RESULTS The number of ambulatory care-sensitive hospitalizations declined from 20.75/1,000 inhabitants [standard deviation (SD = 10.42 in 2000 to 14.92/thousand inhabitants (SD = 10.04 in 2010 Heart failure was the most frequent cause in both years. Hospitalizations rates for hypertension, asthma, and diabetes mellitus, decreased, whereas those for angina pectoris, prenatal and birth disorders, kidney and urinary tract infections, and other acute infections increased. Hospitalization durations and the proportion of deaths due to ambulatory care-sensitive hospitalizations increased significantly. CONCLUSIONS Mean hospitalization rates for sensitive conditions were significantly lower in 2010 than in 2000, but no correlation was found with regard to the expansion of the population coverage of the Family Health Strategy. Hospitalization rates and proportion of deaths were different between the various health care regions in the years evaluated, indicating a need to prioritize the primary health care with high efficiency and quality.

  3. Improving patient experience in a pediatric ambulatory clinic : a mixed method appraisal of service delivery

    NARCIS (Netherlands)

    Soeteman, Marijn; Peters, Vera; Busari, Jamiu O

    2015-01-01

    OBJECTIVE: In 2013, customer satisfaction surveys showed that patients were unhappy with the services provided at our ambulatory clinic. In response, we performed an appraisal of our services, which resulted in the development of a strategy to reduce waiting time and improve quality of service. Infr

  4. Self-Selected Walking Speed is Predictive of Daily Ambulatory Activity in Older Adults.

    Science.gov (United States)

    Middleton, Addie; Fulk, George D; Beets, Michael W; Herter, Troy M; Fritz, Stacy L

    2016-04-01

    Daily ambulatory activity is associated with health and functional status in older adults; however, assessment requires multiple days of activity monitoring. The objective of this study was to determine the relative capabilities of self-selected walking speed (SSWS), maximal walking speed (MWS), and walking speed reserve (WSR) to provide insight into daily ambulatory activity (steps per day) in community-dwelling older adults. Sixty-seven older adults completed testing and activity monitoring (age 80.39 [6.73] years). SSWS (R2 = .51), MWS (R2 = .35), and WSR calculated as a ratio (R2 = .06) were significant predictors of daily ambulatory activity in unadjusted linear regression. Cutpoints for participants achieving < 8,000 steps/day were identified for SSWS (≤ 0.97 m/s, 44.2% sensitivity, 95.7% specificity, 10.28 +LR, 0.58 -LR) and MWS (≤ 1.39 m/s, 60.5% sensitivity, 78.3% specificity, 2.79 +LR, 0.50 -LR). SSWS may be a feasible proxy for assessing and monitoring daily ambulatory activity in older adults.

  5. 75 FR 14606 - Medicare Program; Request for Nominations to the Advisory Panel on Ambulatory Payment...

    Science.gov (United States)

    2010-03-26

    ...; Center for Medicare Management, Hospital & Ambulatory Policy Group, Division of Outpatient Care; 7500... components of the Medicare hospital Outpatient Prospective Payment System (OPPS). The Charter requires that... consist of a chair and up to 15 members who are full- time employees of hospitals, hospital systems,...

  6. Prognostic value of ambulatory heart rate revisited in 6928 subjects from 6 populations

    DEFF Research Database (Denmark)

    Hansen, Tine Willum; Thijs, Lutgarde; Staessen, Jan A.;

    2008-01-01

    The evidence relating mortality and morbidity to heart rate remains inconsistent. We performed 24-hour ambulatory blood pressure monitoring in 6928 subjects (not on beta-blockers; mean age: 56.2 years; 46.5% women) enrolled in prospective population studies in Denmark, Belgium, Japan, Sweden, Uru...

  7. Ciprofloxacin treatment of bacterial peritonitis associated with chronic ambulatory peritoneal dialysis caused by Neisseria cinerea.

    Science.gov (United States)

    Taegtmeyer, M; Saxena, R; Corkill, J E; Anijeet, H; Parry, C M

    2006-08-01

    Bacterial peritonitis is a well-recognized complication of chronic ambulatory peritoneal dialysis (CAPD) in patients with end-stage renal failure. We present a case of peritonitis due to an unusual pathogen, Neisseria cinerea, unresponsive to the standard intraperitoneal (i.p.) vancomycin and gentamicin, which responded rapidly to oral ciprofloxacin.

  8. Coping with a life event in bipolar disorder : ambulatory measurement, signalling and early treatment

    NARCIS (Netherlands)

    Knapen, Stefan E; Riemersma-van der Lek, Rixt F; Haarman, Bartholomeus C M; Schoevers, Robert A

    2016-01-01

    Disruption of the biological rhythm in patients with bipolar disorder is a known risk factor for a switch in mood. This case study describes how modern techniques using ambulatory assessment of sleep parameters can help in signalling a mood switch and start early treatment. We studied a 40-year-old

  9. The Prognostic Value of Ambulatory Heart Rate Revisited in 6928 Subjects from 6 Populations

    DEFF Research Database (Denmark)

    Hansen, Tine Willum; Thijs, Lutgarde; Staessen, Jan A.;

    2008-01-01

    The evidence relating mortality and morbidity to heart rate remains inconsistent. We performed 24-hour ambulatory blood pressure monitoring in 6928 subjects (not on β-blockers; mean age: 56.2 years; 46.5% women) enrolled in prospective population studies in Denmark, Belgium, Japan, Sweden, Uruguay...

  10. Ambulatory diffuse optical tomography and multimodality physiological monitoring system for muscle and exercise applications

    Science.gov (United States)

    Hu, Gang; Zhang, Quan; Ivkovic, Vladimir; Strangman, Gary E.

    2016-09-01

    Ambulatory diffuse optical tomography (aDOT) is based on near-infrared spectroscopy (NIRS) and enables three-dimensional imaging of regional hemodynamics and oxygen consumption during a person's normal activities. Although NIRS has been previously used for muscle assessment, it has been notably limited in terms of the number of channels measured, the extent to which subjects can be ambulatory, and/or the ability to simultaneously acquire synchronized auxiliary data such as electromyography (EMG) or electrocardiography (ECG). We describe the development of a prototype aDOT system, called NINscan-M, capable of ambulatory tomographic imaging as well as simultaneous auxiliary multimodal physiological monitoring. Powered by four AA size batteries and weighing 577 g, the NINscan-M prototype can synchronously record 64-channel NIRS imaging data, eight channels of EMG, ECG, or other analog signals, plus force, acceleration, rotation, and temperature for 24+ h at up to 250 Hz. We describe the system's design, characterization, and performance characteristics. We also describe examples of isometric, cycle ergometer, and free-running ambulatory exercise to demonstrate tomographic imaging at 25 Hz. NINscan-M represents a multiuse tool for muscle physiology studies as well as clinical muscle assessment.

  11. Predictive value of ambulatory blood pressure shortly after withdrawal of antihypertensive drugs in primary care patients

    NARCIS (Netherlands)

    Beltman, FW; Heesen, WF; Smit, AJ; May, JF; deGraeff, PA; Havinga, TK; Schuurman, FH; vanderVeur, E; Lie, KI; MeyboomdeJong, B

    1996-01-01

    Objective-To determine whether ambulatory blood pressure eight weeks after withdrawal of antihypertensive medication is a more sensitive measure than seated blood pressure to predict blood pressure in the long term. Design-Patients with previously untreated diastolic hypertension were treated with a

  12. Ambulatory surgery center market share and rates of outpatient surgery in the elderly.

    Science.gov (United States)

    Hollenbeck, Brent K; Hollingsworth, John M; Dunn, Rodney L; Zaojun Ye; Birkmeyer, John D

    2010-12-01

    Relative to outpatient surgery in hospital settings, ambulatory surgery centers (ASCs) are more efficient and associated with a lower cost per case. However, these facilities may also spur higher overall procedure utilization and thus lead to greater overall health care costs. The authors used the State Ambulatory Surgery Database from the State of Florida to identify Medicare-aged patients undergoing 4 common ambulatory procedures in 2006, including knee arthroscopy, cystoscopy, cataract removal, and colonoscopy. Hospital service areas (HSAs) were characterized according to ASC market share, that is, the proportion of residents undergoing outpatient surgery in these facilities. The authors then examined relationships between ASC market share and rates of each procedure. Age-adjusted rates of ambulatory surgery ranged from 190.5 cases per 1000 to 320.8 cases per 1000 in HSAs with low and high ASC market shares, respectively (P < .01). For all 4 procedures, adjusted rates of procedures were significantly higher in HSAs with the highest ASC market share. The greatest difference, both in relative and absolute terms, was observed for patients undergoing cystoscopy. In areas of high ASC market share, the age-adjusted rate of cystoscopy was nearly 3-fold higher than in areas with low ASC market share (34.5 vs 11.9 per 1000 population; P < .01). The presence of an ASC is associated with higher utilization of common outpatient procedures in the elderly. Whether ASCs are meeting unmet clinical demand or spurring overutilization is not clear.

  13. Limits to Ambulatory Displacement of Coconut Mites in Absence and Presence of Food-Related Cues

    NARCIS (Netherlands)

    Melo, J.W.S.; Lima, D.B.; Sabelis, M.W.; Pallini, A.; Gondim Jr., M.G.C.

    2014-01-01

    Ambulatory movement of plant-feeding mites sets limits to the distances they can cover to reach a new food source. In absence of food-related cues these limits are determined by survival, walking activity, walking path tortuosity and walking speed, whereas in presence of food the limits are also det

  14. Impact of natalizumab on ambulatory improvement in secondary progressive and disabled relapsing-remitting multiple sclerosis.

    Directory of Open Access Journals (Sweden)

    Diego Cadavid

    Full Text Available BACKGROUND: There is an unmet need for disease-modifying therapies to improve ambulatory function in disabled subjects with multiple sclerosis. OBJECTIVES: Assess the effects of natalizumab on ambulatory function in disabled subjects with relapsing-remitting multiple sclerosis (RRMS or secondary progressive multiple sclerosis (SPMS. METHODS: We retrospectively reviewed ambulatory function as measured by timed 25-foot walk (T25FW in clinical trial subjects with an Expanded Disability Status Scale score ≥3.5, including RRMS subjects from the phase 3 AFFIRM and SENTINEL trials, relapsing SPMS subjects from the phase 2 MS231 study, and nonrelapsing SPMS subjects from the phase 1b DELIVER study. For comparison, SPMS subjects from the intramuscular interferon beta-1a (IM IFNβ-1a IMPACT study were also analyzed. Improvement in ambulation was measured using T25FW responder status; response was defined as faster walking times over shorter (6-9-month or longer (24-30-month treatment periods relative to subjects' best predose walking times. RESULTS: There were two to four times more T25FW responders among disabled MS subjects in the natalizumab arms than in the placebo or IM IFNβ-1a arms. Responders walked 25 feet an average of 24%-45% faster than nonresponders. CONCLUSION: Natalizumab improves ambulatory function in disabled RRMS subjects and may have efficacy in disabled SPMS subjects. Confirmation of the latter finding in a prospective SPMS study is warranted.

  15. Accelerometry: A Feasible Method to Quantify Physical Activity in Ambulatory and Nonambulatory Adolescents with Cerebral Palsy

    Directory of Open Access Journals (Sweden)

    Jan Willem Gorter

    2012-01-01

    Full Text Available Objective. To determine the feasibility of physical activity monitoring in adolescents with cerebral palsy (CP. Methods. A convenience sample of ambulatory and non-ambulatory adolescents (N=23; 17 males, 6 females; mean age 13.5 y, SD 2.6 y; Gross Motor Function Classification System (GMFCS distribution: n=9 Level I, n=5 Level II, n=5 Level III, n=4 Level IV was recruited. Physical activity (PA was objectively assessed using the ActiGraph GT1M activity monitor. Discomfort or adverse effects of wearing the accelerometers were recorded by participants. Levels of physical activity were determined as total PA, light PA (LPA, moderate PA (MPA, moderate-to-vigorous (MVPA, and vigorous PA (VPA using cut-points recently validated for CP. Results. Most participants showed little reluctance. Mean daily MVPA for all participants was 30.7 minutes (SD 30.3, which corresponded to 2.7 (SD 2.4 minutes of MVPA per hour or 4.5% (SD 3.9 of the total monitoring time. Total PA and MVPA were greatest in ambulatory youth (GMFCS levels I and II compared with youth who use a walking aid or wheelchair (GMFCS levels III and IV (P<0.05. Conclusion(s. The results support the use of the accelerometer as a feasible and useful measure of activity in ambulatory and nonambulatory adolescents with CP.

  16. Ambulatory Activity of Children with Cerebral Palsy: Which Characteristics Are Important?

    Science.gov (United States)

    van Wely, Leontien; Becher, Jules G.; Balemans, Astrid C. J.; Dallmeijer, Annet J.

    2012-01-01

    Aim: To assess ambulatory activity of children with cerebral palsy (CP), aged 7 to 13 years, and identify associated characteristics. Method: Sixty-two children with spastic CP (39 males, 23 females; mean age 10y 1mo, SD 1y 8mo; age range 7-13y), classified as Gross Motor Function Classification System (GMFCS) levels I to III, participated.…

  17. 76 FR 74121 - Medicare and Medicaid Programs: Hospital Outpatient Prospective Payment; Ambulatory Surgical...

    Science.gov (United States)

    2011-11-30

    .... Background b. Packaging Issues (1) CMS Presentation of Findings Regarding Expanded Packaging at the February... CONTACT: Marjorie Baldo, (410) 786-4617, Hospital outpatient prospective payment issues. Char Thompson, (410) 786-2300, Ambulatory surgical center issues. Michele Franklin, (410) 786-4533, and Jana...

  18. Blood pressure load does not add to ambulatory blood pressure level for cardiovascular risk stratification

    DEFF Research Database (Denmark)

    Li, Yan; Thijs, Lutgarde; Boggia, José

    2014-01-01

    Experts proposed blood pressure (BP) load derived from 24-hour ambulatory BP recordings as a more accurate predictor of outcome than level, in particular in normotensive people. We analyzed 8711 subjects (mean age, 54.8 years; 47.0% women) randomly recruited from 10 populations. We expressed BP...

  19. Institutional and familial cost of patients in continuous ambulatory peritoneal dialysis

    Directory of Open Access Journals (Sweden)

    Enrique Villarreal-Ríos

    2014-07-01

    Full Text Available Objective: to determine the cost of institutional and familial care for patients with chronic kidney disease replacement therapy with continuous ambulatory peritoneal dialysis. Methods: a study of the cost of care for patients with chronic kidney disease treated with continuous ambulatory peritoneal dialysis was undertaken. The sample size (151 was calculated with the formula of the averages for an infinite population. The institutional cost included the cost of outpatient consultation, emergencies, hospitalization, ambulance, pharmacy, medication, laboratory, x-rays and application of erythropoietin. The family cost included transportation cost for services, cost of food during care, as well as the cost of medication and treatment materials acquired by the family for home care. The analysis included averages, percentages and confidence intervals. Results: the average annual institutional cost is US$ 11,004.3. The average annual family cost is US$ 2,831.04. The average annual cost of patient care in continuous ambulatory peritoneal dialysis including institutional and family cost is US$ 13,835.35. Conclusion: the cost of chronic kidney disease requires a large amount of economic resources, and is becoming a serious problem for health services and families. It's also true that the form of patient management in continuous ambulatory peritoneal dialysis is the most efficient in the use of institutional resources and family.

  20. Survival in Mediterranean Ambulatory Patients With Chronic Heart Failure. A Population-based Study

    NARCIS (Netherlands)

    Frigola Capell, E.; Comin-Colet, J.; Davins-Miralles, J.; Gich-Saladich, I.J.; Wensing, M.; Verdu-Rotellar, J.M.

    2013-01-01

    INTRODUCTION AND OBJECTIVES: Scarce research has been performed in ambulatory patients with chronic heart failure in the Mediterranean area. Our aim was to describe survival trends in our target population and the impact of prognostic factors. METHODS: We carried out a population-based retrospective