WorldWideScience

Sample records for online image details

  1. Most Detailed Image of the Crab Nebula

    Science.gov (United States)

    2005-01-01

    This new Hubble image -- one among the largest ever produced with the Earth-orbiting observatory -- shows the most detailed view so far of the entire Crab Nebula ever made. The Crab is arguably the single most interesting object, as well as one of the most studied, in all of astronomy. The image is the largest image ever taken with Hubble's WFPC2 workhorse camera. The Crab Nebula is one of the most intricately structured and highly dynamical objects ever observed. The new Hubble image of the Crab was assembled from 24 individual exposures taken with the NASA/ESA Hubble Space Telescope and is the highest resolution image of the entire Crab Nebula ever made.

  2. Detail Enhancement for Infrared Images Based on Propagated Image Filter

    Directory of Open Access Journals (Sweden)

    Yishu Peng

    2016-01-01

    Full Text Available For displaying high-dynamic-range images acquired by thermal camera systems, 14-bit raw infrared data should map into 8-bit gray values. This paper presents a new method for detail enhancement of infrared images to display the image with a relatively satisfied contrast and brightness, rich detail information, and no artifacts caused by the image processing. We first adopt a propagated image filter to smooth the input image and separate the image into the base layer and the detail layer. Then, we refine the base layer by using modified histogram projection for compressing. Meanwhile, the adaptive weights derived from the layer decomposition processing are used as the strict gain control for the detail layer. The final display result is obtained by recombining the two modified layers. Experimental results on both cooled and uncooled infrared data verify that the proposed method outperforms the method based on log-power histogram modification and bilateral filter-based detail enhancement in both detail enhancement and visual effect.

  3. EPA Enforcement and Compliance History Online: Water Effluent Charts Details

    Data.gov (United States)

    U.S. Environmental Protection Agency — Detailed Discharge Monitoring Report (DMR) data supporting effluent charts for one Clean Water Act discharge permit. Includes effluent parameters, amounts discharged...

  4. Research on the Hotel Image Based on the Detail Service

    Science.gov (United States)

    Li, Ban; Shenghua, Zheng; He, Yi

    Detail service management, initially developed as marketing programs to enhance customer loyalty, has now become an important part of customer relation strategy. This paper analyzes the critical factors of detail service and its influence on the hotel image. We establish the theoretical model of influencing factors on hotel image and propose corresponding hypotheses. We use applying statistical method to test and verify the above-mentioned hypotheses. This paper provides a foundation for further study of detail service design and planning issues.

  5. Biomedical images texture detail denoising based on PDE

    Science.gov (United States)

    Chen, Guan-nan; Pan, Jian-ji; Li, Chao; Chen, Rong; Lin, Ju-qiang; Yan, Kun-tao; Huang, Zu-fang

    2009-08-01

    Biomedical images denosing based on Partial Differential Equation are well-known for their good processing results. General denosing methods based on PDE can remove the noises of images with gentle changes and preserve more structure details of edges, but have a poor effectiveness on the denosing of biomedical images with many texture details. This paper attempts to make an overview of biomedical images texture detail denosing based on PDE. Subsequently, Three kinds of important image denosing schemes are introduced in this paper: one is image denosing based on the adaptive parameter estimation total variation model, which denosing the images based on region energy distribution; the second is using G norm on the perception scale, which provides a more intuitive understanding of this norm; the final is multi-scale denosing decomposition. The above methods involved can preserve more structures of biomedical images texture detail. Furthermore, this paper demonstrates the applications of those three methods. In the end, the future trend of biomedical images texture detail denosing Based on PDE is pointed out.

  6. An online interactive simulation system for medical imaging education.

    Science.gov (United States)

    Dikshit, Aditya; Wu, Dawei; Wu, Chunyan; Zhao, Weizhao

    2005-09-01

    This report presents a recently developed web-based medical imaging simulation system for teaching students or other trainees who plan to work in the medical imaging field. The increased importance of computer and information technology widely applied to different imaging techniques in clinics and medical research necessitates a comprehensive medical imaging education program. A complete tutorial of simulations introducing popular imaging modalities, such as X-ray, MRI, CT, ultrasound and PET, forms an essential component of such an education. Internet technologies provide a vehicle to carry medical imaging education online. There exist a number of internet-based medical imaging hyper-books or online documentations. However, there are few providing interactive computational simulations. We focus on delivering knowledge of the physical principles and engineering implementation of medical imaging techniques through an interactive website environment. The online medical imaging simulation system presented in this report outlines basic principles underlying different imaging techniques and image processing algorithms and offers trainees an interactive virtual laboratory. For education purposes, this system aims to provide general understanding of each imaging modality with comprehensive explanations, ample illustrations and copious references as its thrust, rather than complex physics or detailed math. This report specifically describes the development of the tutorial for commonly used medical imaging modalities. An internet-accessible interface is used to simulate various imaging algorithms with user-adjustable parameters. The tutorial is under the MATLAB Web Server environment. Macromedia Director MX is used to develop interactive animations integrating theory with graphic-oriented simulations. HTML and JavaScript are used to enable a user to explore these modules online in a web browser. Numerous multiple choice questions, links and references for advanced study are

  7. Hdr Imaging for Feature Detection on Detailed Architectural Scenes

    Science.gov (United States)

    Kontogianni, G.; Stathopoulou, E. K.; Georgopoulos, A.; Doulamis, A.

    2015-02-01

    3D reconstruction relies on accurate detection, extraction, description and matching of image features. This is even truer for complex architectural scenes that pose needs for 3D models of high quality, without any loss of detail in geometry or color. Illumination conditions influence the radiometric quality of images, as standard sensors cannot depict properly a wide range of intensities in the same scene. Indeed, overexposed or underexposed pixels cause irreplaceable information loss and degrade digital representation. Images taken under extreme lighting environments may be thus prohibitive for feature detection/extraction and consequently for matching and 3D reconstruction. High Dynamic Range (HDR) images could be helpful for these operators because they broaden the limits of illumination range that Standard or Low Dynamic Range (SDR/LDR) images can capture and increase in this way the amount of details contained in the image. Experimental results of this study prove this assumption as they examine state of the art feature detectors applied both on standard dynamic range and HDR images.

  8. HDR IMAGING FOR FEATURE DETECTION ON DETAILED ARCHITECTURAL SCENES

    Directory of Open Access Journals (Sweden)

    G. Kontogianni

    2015-02-01

    Full Text Available 3D reconstruction relies on accurate detection, extraction, description and matching of image features. This is even truer for complex architectural scenes that pose needs for 3D models of high quality, without any loss of detail in geometry or color. Illumination conditions influence the radiometric quality of images, as standard sensors cannot depict properly a wide range of intensities in the same scene. Indeed, overexposed or underexposed pixels cause irreplaceable information loss and degrade digital representation. Images taken under extreme lighting environments may be thus prohibitive for feature detection/extraction and consequently for matching and 3D reconstruction. High Dynamic Range (HDR images could be helpful for these operators because they broaden the limits of illumination range that Standard or Low Dynamic Range (SDR/LDR images can capture and increase in this way the amount of details contained in the image. Experimental results of this study prove this assumption as they examine state of the art feature detectors applied both on standard dynamic range and HDR images.

  9. Featured Image: A Detailed Look at the Crab Nebula

    Science.gov (United States)

    Kohler, Susanna

    2017-07-01

    Planning on watching fireworks tomorrow? Heres an astronomical firework to help you start the celebrations! A new study has stunningly detailed the Crab Nebula (click for a closer look), a nebula 6,500 light-years away thought to have been formedby a supernova explosion and the subsequent ultrarelativistic wind emitted by the pulsar at its heart. Led by Gloria Dubner (University of Buenos Aires), the authors of this study obtained new observations of the Crab Nebula from five different telescopes. They compiled these observations to compare the details of the nebulas structure across different wavelengths, which allowedthem to learnabout the sources of various features within the nebula. In the images above, thetop left shows the 3 GHz data from the Very Large Array (radio). Moving clockise, the radio data (shown in red) is composited with: infrared data from Spitzer Space Telescope, optical continuum from Hubble Space Telescope, 500-nm optical datafrom Hubble, and ultraviolet data from XMM-Newton. The final two images are of the nebula center, and they are composites of the radio imagewith X-ray data from Chandra and near-infrared data from Hubble. To read more about what Dubner and collaborators learned (and to see more spectacular images!), check out the paper below.CitationG. Dubner et al 2017 ApJ 840 82. doi:10.3847/1538-4357/aa6983

  10. Assessing product image quality for online shopping

    Science.gov (United States)

    Goswami, Anjan; Chung, Sung H.; Chittar, Naren; Islam, Atiq

    2012-01-01

    Assessing product-image quality is important in the context of online shopping. A high quality image that conveys more information about a product can boost the buyer's confidence and can get more attention. However, the notion of image quality for product-images is not the same as that in other domains. The perception of quality of product-images depends not only on various photographic quality features but also on various high level features such as clarity of the foreground or goodness of the background etc. In this paper, we define a notion of product-image quality based on various such features. We conduct a crowd-sourced experiment to collect user judgments on thousands of eBay's images. We formulate a multi-class classification problem for modeling image quality by classifying images into good, fair and poor quality based on the guided perceptual notions from the judges. We also conduct experiments with regression using average crowd-sourced human judgments as target. We compute a pseudo-regression score with expected average of predicted classes and also compute a score from the regression technique. We design many experiments with various sampling and voting schemes with crowd-sourced data and construct various experimental image quality models. Most of our models have reasonable accuracies (greater or equal to 70%) on test data set. We observe that our computed image quality score has a high (0.66) rank correlation with average votes from the crowd sourced human judgments.

  11. Anatomy online: presentation of a detailed WWW atlas of human gross anatomy--reference for medical education.

    Science.gov (United States)

    Jastrow, Holger; Vollrath, Lutz

    2002-11-01

    We present an online anatomy atlas based on the Visible Human Project (VHP) of the US National Library of Medicine. The objective is to provide original unlabeled as well as labeled sections of the human body of high quality and resolution on the Internet, for use in basic and continuing medical education. For a representative overview of the body, 370 axial sections were selected from the male and female data base of the VHP with special regard to regions of clinical interest. Each section is accompanied by its corresponding computer tomography (CT) image and, if available, magnetic resonance images (MRI) for quick and easy comparison of morphologic and radiologic structures. The sections can be studied unlabeled or labeled according to the current Terminologia Anatomica. A linked vocabulary with more than 850 terms explains the labeling. Animations of the sections as well as of CT and MR images allow for further visualization of the topographic relationships of anatomical structures. The responses to the project indicate that students and physicians regard the Internet Atlas of Human Gross Anatomy as a most useful aid for learning and reviewing anatomical details. The atlas is accessible on: http://www.uni-mainz.de/FB/Medizin/Anatomie/workshop/vishuman/Eready.html.

  12. Cloud Imagers Offer New Details on Earth's Health

    Science.gov (United States)

    2009-01-01

    A stunning red sunset or purple sunrise is an aesthetic treat with a scientific explanation: The colors are a direct result of the absorption or reflectance of solar radiation by atmospheric aerosols, minute particles (either solid or liquid) in the Earth s atmosphere that occur both naturally and because of human activity. At the beginning or end of the day, the Sun s rays travel farther through the atmosphere to reach an observer s eyes and more green and yellow light is scattered, making the Sun appear red. Sunset and sunrise are especially colorful when the concentration of atmospheric particles is high. This ability of aerosols to absorb and reflect sunlight is not just pretty; it also determines the amount of radiation and heat that reaches the Earth s surface, and can profoundly affect climate. In the atmosphere, aerosols are also important as nuclei for the condensation of water droplets and ice crystals. Clouds with fewer aerosols cannot form as many water droplets (called cloud particles), and consequently, do not scatter light well. In this case, more sunlight reaches the Earth s surface. When aerosol levels in clouds are high, however, more nucleation points can form small liquid water droplets. These smaller cloud particles can reflect up to 90 percent of visible radiation to space, keeping the heat from ever reaching Earth s surface. The tendency for these particles to absorb or reflect the Sun s energy - called extinction by astronomers - depends on a number of factors, including chemical composition and the humidity and temperature in the surrounding air; because cloud particles are so small, they are affected quickly by minute changes in the atmosphere. Because of this sensitivity, atmospheric scientists study cloud particles to anticipate patterns and shifts in climate. Until recently, NASA s study of atmospheric aerosols and cloud particles has been focused primarily on satellite images, which, while granting large-scale atmospheric analysis

  13. An on-line remote supervisory system for microparticles based on image analysis

    Science.gov (United States)

    Liu, Wei-Hua; Jiang, Ming-Shun; Sui, Qing-Mei

    2011-11-01

    A new on-line remote particle analysis system based on image processing has been developed to measure microparticles. The system is composed of particle collector sensor (PCS), particle image sensor (PIS), image remote transmit module and image processing system. Then some details of image processing are discussed. The main advantage of this system is more convenient in particle sample collection and particle image acquisition. The particle size can be obtained using the system with a deviation abot less than 1 μm, and the particle number can be obtained without deviation. The developed system is also convenient and versatile for other analyses of microparticle for academic and industrial application.

  14. Hundred metre virtual telescope captures unique detailed colour image

    Science.gov (United States)

    2009-02-01

    A team of French astronomers has captured one of the sharpest colour images ever made. They observed the star T Leporis, which appears, on the sky, as small as a two-storey house on the Moon [1]. The image was taken with ESO's Very Large Telescope Interferometer (VLTI), emulating a virtual telescope about 100 metres across and reveals a spherical molecular shell around an aged star. ESO PR Photo 06a/09 The star T Leporis as seen with VLTI ESO PR Photo 06b/09 The star T Leporis to scale ESO PR Photo 06c/09 A virtual 100-metre telescope ESO PR Photo 06d/09 The orbit of Theta1 Orionis C ESO PR Video 06a/09 Zoom-in onto T Leporis "This is one of the first images made using near-infrared interferometry," says lead author Jean-Baptiste Le Bouquin. Interferometry is a technique that combines the light from several telescopes, resulting in a vision as sharp as that of a giant telescope with a diameter equal to the largest separation between the telescopes used. Achieving this requires the VLTI system components to be positioned to an accuracy of a fraction of a micrometre over about 100 metres and maintained so throughout the observations -- a formidable technical challenge. When doing interferometry, astronomers must often content themselves with fringes, the characteristic pattern of dark and bright lines produced when two beams of light combine, from which they can model the physical properties of the object studied. But, if an object is observed on several runs with different combinations and configurations of telescopes, it is possible to put these results together to reconstruct an image of the object. This is what has now been done with ESO's VLTI, using the 1.8-metre Auxiliary Telescopes. "We were able to construct an amazing image, and reveal the onion-like structure of the atmosphere of a giant star at a late stage of its life for the first time," says Antoine Mérand, member of the team. "Numerical models and indirect data have allowed us to imagine the

  15. Micro-computed tomography for small animal imaging: Technological details

    Institute of Scientific and Technical Information of China (English)

    Hao Li; Hui Zhang; Zhiwei Tang; Guangshu Hu

    2008-01-01

    The high-resolution micro-computed tomography(micro-CT)system has now become an important tool for biological research.The micro-CT system enables a non-invasive inspection to screen anatomical changes in small animals.The promising advantages include high-spatial resolution,high sensitivity to bone and lung,short scan time and cost-effectiveness.The dose received by the small animal might be a critical concern in the research.In this article,the choice of the components,fundamental physical problems,the image reconstruction algorithm and the representative applications of micro-CT are summarized.Some results from our research group are also presented to show high-resolution images obtained by the micro-CT system.

  16. Detailed characterization of the LLNL imaging proton spectrometer

    Science.gov (United States)

    Rasmus, A. M.; Hazi, A. U.; Manuel, M. J.-E.; Kuranz, C. C.; Klein, S. R.; Belancourt, P. X.; Fein, J. R.; MacDonald, M. J.; Drake, R. P.; Pollock, B. B.; Park, J.; Williams, G. J.; Chen, H.

    2016-11-01

    Ultra-intense short pulse lasers incident on solid targets (e.g., thin Au foils) produce well collimated, broad-spectrum proton beams. These proton beams can be used to characterize magnetic fields, electric fields, and density gradients in high energy-density systems. The LLNL-Imaging Proton Spectrometer (L-IPS) was designed and built [H. Chen et al., Rev. Sci. Instrum. 81, 10D314 (2010)] for use with such laser produced proton beams. The L-IPS has an energy range of 50 keV-40 MeV with a resolving power (E/dE) of about 275 at 1 MeV and 21 at 20 MeV, as well as a single spatial imaging axis. In order to better characterize the dispersion and imaging capability of this diagnostic, a 3D finite element analysis solver is used to calculate the magnetic field of the L-IPS. Particle trajectories are then obtained via numerical integration to determine the dispersion relation of the L-IPS in both energy and angular space.

  17. Online purchase intentions: A multi-channel store image perspective

    NARCIS (Netherlands)

    Verhagen, T.; van Dolen, W.

    2009-01-01

    The advantages of the bricks-and-clicks retail format in the battle for the online customer has been widely discussed but empirical research on it has been limited. We applied a multi-channel store image perspective to assess its influence on online purchase intentions. Drawing on a sample of 630 cu

  18. Tomographic brain imaging with nucleolar detail and automatic cell counting

    Science.gov (United States)

    Hieber, Simone E.; Bikis, Christos; Khimchenko, Anna; Schweighauser, Gabriel; Hench, Jürgen; Chicherova, Natalia; Schulz, Georg; Müller, Bert

    2016-09-01

    Brain tissue evaluation is essential for gaining in-depth insight into its diseases and disorders. Imaging the human brain in three dimensions has always been a challenge on the cell level. In vivo methods lack spatial resolution, and optical microscopy has a limited penetration depth. Herein, we show that hard X-ray phase tomography can visualise a volume of up to 43 mm3 of human post mortem or biopsy brain samples, by demonstrating the method on the cerebellum. We automatically identified 5,000 Purkinje cells with an error of less than 5% at their layer and determined the local surface density to 165 cells per mm2 on average. Moreover, we highlight that three-dimensional data allows for the segmentation of sub-cellular structures, including dendritic tree and Purkinje cell nucleoli, without dedicated staining. The method suggests that automatic cell feature quantification of human tissues is feasible in phase tomograms obtained with isotropic resolution in a label-free manner.

  19. High dynamic range infrared images detail enhancement based on local edge preserving filter

    Science.gov (United States)

    Song, Qiong; Wang, Yuehuan; Bai, Kun

    2016-07-01

    In the field of infrared (IR) image processing, displaying a high dynamic range (HDR) image on a low dynamic range display equipment with a natural visual effect, clear details on local areas and less artifacts is an important issue. In this paper, we present a new approach to display HDR IR images with contrast enhancement. First, the local edge-preserving filter (LEPF) is utilized to separate the image into a base layer and detail layer(s). After the filtering procedure, we use an adaptive Gamma transformation to adjust the gray distribution of the base layer, and stretch the detail layer based on a human visual effect principle. Then, we recombine the detail layer and base layer to obtain the enhance output. Finally, we adjust the luminance of output by applying multiple exposure fusion method. The experimental results demonstrate that our proposed method can provide a significant performance in terms of enhancing details and less artifacts than the state of the arts.

  20. Quality assessment for online iris images

    CSIR Research Space (South Africa)

    Makinana, S

    2015-01-01

    Full Text Available Iris recognition systems have attracted much attention for their uniqueness, stability and reliability. However, performance of this system depends on quality of iris image. Therefore there is a need to select good quality images before features can...

  1. ONLINE GRINDING WHEEL WEAR COMPENSATION BY IMAGE BASED MEASURING TECHNIQUES

    Institute of Scientific and Technical Information of China (English)

    WAN Daping; HU Dejin; WU Qi; ZHANG Yonghong

    2006-01-01

    Automatic compensation of grinding wheel wear in dry grinding is accomplished by an image based online measurement method. A kind of PC-based charge-coupled device image recognition system is schemed out, which detects the topography changes of the grinding wheel surface. Profile data, which corresponds to the wear and the topography, is measured by using a digital image processing method. The grinding wheel wear is evaluated by analyzing the position deviation of the grinding wheel edge. The online wear compensation is achieved according to the measure results. The precise detection and automatic compensation system is integrated into an open structure CNC curve grinding machine. A practical application is carried out to fulfil the precision curve grinding. The experimental results confirm the benefits of the proposed techniques, and the online detection accuracy is less than 5 μm. The grinding machine provides higher precision according to the in-process grinding wheel error compensation.

  2. Online information Impact in the virtual destination image formation

    Directory of Open Access Journals (Sweden)

    Célia Maria Conceição Salmim Rafael

    2014-05-01

    Full Text Available The influence of the destination image in the decision process and choice of destination by tourists is transverse to its intangible nature. Recent studies expand and modify the conventional image constructs specifying information sources transmitted through the internet. The scenario resulting from the literature review allows us to understand the importance of experience for touristic activity and theoretical proposition of virtual tourism as "virtual tourist experience", its determinants and its implications for the overall image destination formation. This study presents a literature review base to the empiric research proposal whose general objective comprises the analysis of the influence of factors, such as interactivity, in online communication and contact with virtual tourism experiences online in image destination formation and image destination.

  3. An on-line remote supervisory system for microparticles based on image analysis

    Institute of Scientific and Technical Information of China (English)

    LIU Wei-hua; JIANG Ming-shun; SUI Qing-mei

    2011-01-01

    A new on-line remote particle analysis system based on image processing has been developed to measure microparticles.The system is composed of particle collector sensor (PCS),particle image sensor (PIS),image remote wansmit module and image processing system.Then some details of image processing are discussed.The main advantage of this system is more convenient in particle sample collection and particle image acquisition.The particle size can be obtained using the system with a deviation abot less than 1 μm,and the particle number can be obtained without deviation,The developed system is also convenient and versatile for other analyses of microparticle for academic and industrial application.

  4. A method for analyzing on-line video images of crystallization at high-solid concentrations

    Institute of Scientific and Technical Information of China (English)

    Jian Wan; Cai Y.Ma; Xue Z.Wang

    2008-01-01

    Recent research has demonstrated that on-line video imaging is a very promising technique for monitoring crystallization processes. The bottleneck in applying the technique for real-time closed-loop control is considered as image analysis that needs to be robust, fast and able to handle varied image qualities due to temporal variations of operating conditions such as mixing and solid concentrations. Image analysis at high-solid concentrations turns out to be extremely challenging because crystals tend to overlap or attach to each other and the boundaries between the crystals are usually ambiguous. This paper presents an image segmentation algorithm that can effectively deal with images taken at high-solid concentrations. The method segments crystals attached to each other along the mostly related concave points on the contours of crystal blocks. The detailed procedure is introduced with application to crystallization of L-glutamic acid in a hot-stage reactor.

  5. Imaging by Electrochemical Scanning Tunneling Microscopy and Deconvolution Resolving More Details of Surfaces Nanomorphology

    DEFF Research Database (Denmark)

    Andersen, Jens Enevold Thaulov

    to crystallographic-surface structures. Within the wide range of new technologies, those images surface features, the electrochemical scanning tunneling microscope (ESTM) provides means of atomic resolution where the tip participates actively in the process of imaging. Two metallic surfaces influence ions trapped...... of the characteristic details of the images. A large proportion of the observed noise may be explained by the scanning actions of the feedback circuitry while a minor fraction of the image details may be explained by surface drift phenomena. As opposed to the method of deconvolution, conventional methods of filtering......Upon imaging, electrochemical scanning tunneling microscopy (ESTM), scanning electrochemical micro-scopy (SECM) and in situ STM resolve information on electronic structures and on surface topography. At very high resolution, imaging processing is required, as to obtain information that relates...

  6. A testing method for the machine details state by means of the speckle image parameters analysis

    Science.gov (United States)

    Malov, A. N.; Pavlov, P. V.; Neupokoeva, A. V.

    2016-08-01

    Non destructive testing method, allowing to define a residual resource of power details of mechanical engineering designs under the analysis of registered speckle-image parameters, it is discussed. The "chessboard" algorithm based on calculation of correlation between the given speckle-image and the a chessboard image is considered. Experimental research results of an offered non destructive testing method are presented. It is established, that to increase in quantity of a power detail tests cycles there is an increase in roughness parameters that conducts to reduction of correlation factor between reference and to resultants the image at the given stage of test. Knowing of correlation factor change dynamics, it is possible to define a residual resource of power details while in exploitation.

  7. Explaining Online Purchase Intentions: A Multi-Channel Store Image Perspective

    NARCIS (Netherlands)

    Dolen, van Willemijn; Verhagen, Tibert

    2007-01-01

    This study is one of the few empirical works addressing the impact of offline and online store impressions on consumer online purchase intentions. Building upon the literature on store image and consumer online purchasing, we propose positive effects of online store image and suggest mixed influence

  8. Ophthoselfie: Detailed Self-imaging of Cornea and Anterior Segment by Smartphone

    Directory of Open Access Journals (Sweden)

    Abdullah Kaya

    2017-06-01

    Full Text Available Objectives: To describe the ophthoselfie, a method by which everyone can take detailed self-images of the cornea and anterior segment with a smartphone. Materials and Methods: A 90-diopter non-contact double aspheric lens was attached to posterior camera of the smartphone by clear tape. Images of one eye on the screen of the smartphone could be seen with the other eye in the mirror and images were taken. Results: Accurate and detailed images of the cornea and anterior segment of the eye could be taken. Conclusion: The ophthoselfie allows everyone to take their own detailed anterior segment images by smartphone. To create a clear and detailed self-image of the cornea and anterior segment on the screen of a smartphone may lead to the development of new applications and facilitate patients’ early recognition of certain conditions like keratoconus, refractive errors, corneal rejection, and uveitis. This method may also be useful in some urgent situations by allowing patients to take self-images of the eye and share them with a physician.

  9. Ophthoselfie: Detailed Self-imaging of Cornea and Anterior Segment by Smartphone.

    Science.gov (United States)

    Kaya, Abdullah

    2017-06-01

    To describe the ophthoselfie, a method by which everyone can take detailed self-images of the cornea and anterior segment with a smartphone. A 90-diopter non-contact double aspheric lens was attached to posterior camera of the smartphone by clear tape. Images of one eye on the screen of the smartphone could be seen with the other eye in the mirror and images were taken. Accurate and detailed images of the cornea and anterior segment of the eye could be taken. The ophthoselfie allows everyone to take their own detailed anterior segment images by smartphone. To create a clear and detailed self-image of the cornea and anterior segment on the screen of a smartphone may lead to the development of new applications and facilitate patients' early recognition of certain conditions like keratoconus, refractive errors, corneal rejection, and uveitis. This method may also be useful in some urgent situations by allowing patients to take self-images of the eye and share them with a physician.

  10. A secure online image trading system for untrusted cloud environments.

    Science.gov (United States)

    Munadi, Khairul; Arnia, Fitri; Syaryadhi, Mohd; Fujiyoshi, Masaaki; Kiya, Hitoshi

    2015-01-01

    In conventional image trading systems, images are usually stored unprotected on a server, rendering them vulnerable to untrusted server providers and malicious intruders. This paper proposes a conceptual image trading framework that enables secure storage and retrieval over Internet services. The process involves three parties: an image publisher, a server provider, and an image buyer. The aim is to facilitate secure storage and retrieval of original images for commercial transactions, while preventing untrusted server providers and unauthorized users from gaining access to true contents. The framework exploits the Discrete Cosine Transform (DCT) coefficients and the moment invariants of images. Original images are visually protected in the DCT domain, and stored on a repository server. Small representation of the original images, called thumbnails, are generated and made publicly accessible for browsing. When a buyer is interested in a thumbnail, he/she sends a query to retrieve the visually protected image. The thumbnails and protected images are matched using the DC component of the DCT coefficients and the moment invariant feature. After the matching process, the server returns the corresponding protected image to the buyer. However, the image remains visually protected unless a key is granted. Our target application is the online market, where publishers sell their stock images over the Internet using public cloud servers.

  11. Towards online patient imaging during helical radiotherapy.

    Science.gov (United States)

    Yu, L; Poole, C M; Lancaster, C M; Sylvander, S R

    2015-03-01

    Exit-detector data from helical radiation therapy have been studied extensively for delivery verification and dose reconstruction. Since the same radiation source is used for both imaging and treatment, this work investigates the possibility of utilising exit-detector raw data for imaging purposes. This gives rise to potential clinical applications such as retrospective daily setup verification and inter-fractional setup error detection. The exit-detector raw data were acquired and independently analysed using Python programming language. The raw data were extracted from the treatment machine's onboard computer, and converted into 2D array files. The contours of objects (phantom or patient) were acquired by applying a logarithmic function to the ratio of two sinograms, one with the object in the beam and one without. The setup variation between any two treatment deliveries can be detected by applying the same function to their corresponding exit-detector sinograms. The contour of the object was well defined by the secondary radiation from the treatment beam and validated with the imaging beam, although no internal structures were discernible due to the interference from the primary radiation. The sensitivity of the setup variation detection was down to 2 mm, which was mainly limited by the resolution of the exit-detector itself. The exit-detector data from treatment procedures contain valuable photon exit fluence maps which can be utilised for contour definition and verification of patient alignment without reconstruction.

  12. Online Unmixing of Multitemporal Hyperspectral Images Accounting for Spectral Variability.

    Science.gov (United States)

    Thouvenin, Pierre-Antoine; Dobigeon, Nicolas; Tourneret, Jean-Yves

    2016-09-01

    Hyperspectral unmixing is aimed at identifying the reference spectral signatures composing a hyperspectral image and their relative abundance fractions in each pixel. In practice, the identified signatures may vary spectrally from an image to another due to varying acquisition conditions, thus inducing possibly significant estimation errors. Against this background, the hyperspectral unmixing of several images acquired over the same area is of considerable interest. Indeed, such an analysis enables the endmembers of the scene to be tracked and the corresponding endmember variability to be characterized. Sequential endmember estimation from a set of hyperspectral images is expected to provide improved performance when compared with methods analyzing the images independently. However, the significant size of the hyperspectral data precludes the use of batch procedures to jointly estimate the mixture parameters of a sequence of hyperspectral images. Provided that each elementary component is present in at least one image of the sequence, we propose to perform an online hyperspectral unmixing accounting for temporal endmember variability. The online hyperspectral unmixing is formulated as a two-stage stochastic program, which can be solved using a stochastic approximation. The performance of the proposed method is evaluated on synthetic and real data. Finally, a comparison with independent unmixing algorithms illustrates the interest of the proposed strategy.

  13. Online hyperspectral imaging system for evaluating quality of agricultural products

    Science.gov (United States)

    Mo, Changyeun; Kim, Giyoung; Lim, Jongguk

    2017-06-01

    The consumption of fresh-cut agricultural produce in Korea has been growing. The browning of fresh-cut vegetables that occurs during storage and foreign substances such as worms and slugs are some of the main causes of consumers' concerns with respect to safety and hygiene. The purpose of this study is to develop an on-line system for evaluating quality of agricultural products using hyperspectral imaging technology. The online evaluation system with single visible-near infrared hyperspectral camera in the range of 400 nm to 1000 nm that can assess quality of both surfaces of agricultural products such as fresh-cut lettuce was designed. Algorithms to detect browning surface were developed for this system. The optimal wavebands for discriminating between browning and sound lettuce as well as between browning lettuce and the conveyor belt were investigated using the correlation analysis and the one-way analysis of variance method. The imaging algorithms to discriminate the browning lettuces were developed using the optimal wavebands. The ratio image (RI) algorithm of the 533 nm and 697 nm images (RI533/697) for abaxial surface lettuce and the ratio image algorithm (RI533/697) and subtraction image (SI) algorithm (SI538-697) for adaxial surface lettuce had the highest classification accuracies. The classification accuracy of browning and sound lettuce was 100.0% and above 96.0%, respectively, for the both surfaces. The overall results show that the online hyperspectral imaging system could potentially be used to assess quality of agricultural products.

  14. Online self-service processing system of ZY-3 satellite: a prospective study of image cloud services

    Science.gov (United States)

    Wang, Hongyan; Wang, Huabin; Shi, Shaoyu

    2015-12-01

    The strong demands for satellite images are increasing not only in professional fields, but also in the non-professionals. But the online map services with up-to-date satellite images can serve few demands. One challenge is how to provide online processing service, which need to handle real-time online data-intensive geospatial computation and visualization. Under the background of the development of cloud computing technology, the problem can be figured out partly. The other challenge is how to implement user-customized online processing without professional background and knowledge. An online self-service processing system of ZY-3 Satellite images is designed to implement an on-demand service mode in this paper. It will work with only some simple parameters being set up for the non-professionals without having to care about the specific processing steps. And the professionals can assemble the basic processing services to a service chain, which can work out a more complex processing and a better result. This intelligent self-service online system for satellite images processing, which is called the prototype of satellite image cloud service in this paper, is accelerated under the development of cloud computing technology and researches on data-intensive computing. To realize the goal, the service mode and framework of the online self-service processing system of ZY-3 Satellite images are figured out in this paper. The details of key technologies are also discussed, including user space virtualization management, algorithm-level parallel image processing, image service chain construction, etc. And the experimental system is built up as a prospective study of image cloud services.

  15. An Implementation and Detailed Analysis of the K-SVD Image Denoising Algorithm

    OpenAIRE

    Marc Lebrun; Arthur Leclaire

    2012-01-01

    K-SVD is a signal representation method which, from a set of signals, can derive a dictionary able to approximate each signal with a sparse combination of the atoms. This paper focuses on the K-SVD-based image denoising algorithm. The implementation is described in detail and its parameters are analyzed and varied to come up with a reliable implementation.

  16. Detailed Image Comparison using MDI, HMI and GONG Co-Eval Observations

    Science.gov (United States)

    Korzennik, Sylvain G.

    2017-08-01

    I present preliminary results from detailed image comparison using MDI, HMI and GONG co-eval observations taken in 2014, when all three instruments were operational. This comparison allows me to estimate both the instrumental image distortion and the instrument PSF, with respect to HMI. Both intensity and velocity images are compared when available. The precise observing perspective of each instrument had to be accounted since it affects the projected image on the instrument detector at the required level of precision (i.e., a fraction of an HMI pixel). In the process, it was discovered that the meta data generated by the respective projects were not accurate enough. While the inclusion of the image distortion and the instrument PSF in the spatial decomposition will improve the determination of high degree modes, it may also benefit other local helioseismic analysis.

  17. Online reconstruction of 3D magnetic particle imaging data

    Science.gov (United States)

    Knopp, T.; Hofmann, M.

    2016-06-01

    Magnetic particle imaging is a quantitative functional imaging technique that allows imaging of the spatial distribution of super-paramagnetic iron oxide particles at high temporal resolution. The raw data acquisition can be performed at frame rates of more than 40 volumes s-1. However, to date image reconstruction is performed in an offline step and thus no direct feedback is available during the experiment. Considering potential interventional applications such direct feedback would be mandatory. In this work, an online reconstruction framework is implemented that allows direct visualization of the particle distribution on the screen of the acquisition computer with a latency of about 2 s. The reconstruction process is adaptive and performs block-averaging in order to optimize the signal quality for a given amount of reconstruction time.

  18. Detailed analysis of latencies in image-based dynamic MLC tracking

    Energy Technology Data Exchange (ETDEWEB)

    Poulsen, Per Rugaard; Cho, Byungchul; Sawant, Amit; Ruan, Dan; Keall, Paul J. [Department of Radiation Oncology, Stanford University, Stanford, California 94305 and Department of Oncology and Department of Medical Physics, Aarhus University Hospital, 8000 Aarhus (Denmark); Department of Radiation Oncology, Stanford University, Stanford, California 94305 and Department of Radiation Oncology, Asan Medical Center, Seoul 138-736 (Korea, Republic of); Department of Radiation Oncology, Stanford University, Stanford, California 94305 (United States)

    2010-09-15

    Purpose: Previous measurements of the accuracy of image-based real-time dynamic multileaf collimator (DMLC) tracking show that the major contributor to errors is latency, i.e., the delay between target motion and MLC response. Therefore the purpose of this work was to develop a method for detailed analysis of latency contributions during image-based DMLC tracking. Methods: A prototype DMLC tracking system integrated with a linear accelerator was used for tracking a phantom with an embedded fiducial marker during treatment delivery. The phantom performed a sinusoidal motion. Real-time target localization was based on x-ray images acquired either with a portal imager or a kV imager mounted orthogonal to the treatment beam. Each image was stored in a file on the imaging workstation. A marker segmentation program opened the image file, determined the marker position in the image, and transferred it to the DMLC tracking program. This program estimated the three-dimensional target position by a single-imager method and adjusted the MLC aperture to the target position. Imaging intervals {Delta}T{sub image} from 150 to 1000 ms were investigated for both kV and MV imaging. After the experiments, the recorded images were synchronized with MLC log files generated by the MLC controller and tracking log files generated by the tracking program. This synchronization allowed temporal analysis of the information flow for each individual image from acquisition to completed MLC adjustment. The synchronization also allowed investigation of the MLC adjustment dynamics on a considerably finer time scale than the 50 ms time resolution of the MLC log files. Results: For {Delta}T{sub image}=150 ms, the total time from image acquisition to completed MLC adjustment was 380{+-}9 ms for MV and 420{+-}12 ms for kV images. The main part of this time was from image acquisition to completed image file writing (272 ms for MV and 309 ms for kV). Image file opening (38 ms), marker segmentation (4 ms

  19. Impacts of Filtration on Contrast-Detail Detectability of an X-ray Imaging System

    Directory of Open Access Journals (Sweden)

    2006-01-01

    Full Text Available The purpose of this study is to investigate the impacts of added filtration on the contrast-detail detectability of a digital X-ray imaging system for small animal studies. A digital X-ray imaging system specifically designed for small animal studies was used. This system is equipped with a micro X-ray source with a tungsten target and a beryllium window filtration and a CCD-based digital detector. Molybdenum filters of 0 mm, 0.02 mm, and 0.05 mm in thickness were added. The corresponding X-ray spectra and contrast-detail detectabilities were measured using two phantoms of different thicknesses simulating breast tissue under different exposures. The added Mo filters reduced the low-energy as well as the high-energy photons, hence providing a narrowband for imaging quality improvement. In the experiments with a 1.15 cm phantom, the optimal image detectability was observed using 22 kVp and the 0.05 mm Mo filter. With the 2.15 cm phantom, the best detectability was obtained with 22 kVp and the 0.02 mm Mo filter. Our experiments showed that appropriate filtrations could reduce certain low- and high-energy components of X-ray spectra which have limited contributions to image contrast. At the same time, such filtration could improve the contrast-detail detectability, particularly at relatively low kVp and high filtration. Therefore, optimal image quality can be obtained with the same absorbed radiation dose by the subjects when appropriate filtration is used.

  20. An Implementation and Detailed Analysis of the K-SVD Image Denoising Algorithm

    Directory of Open Access Journals (Sweden)

    Marc Lebrun

    2012-05-01

    Full Text Available K-SVD is a signal representation method which, from a set of signals, can derive a dictionary able to approximate each signal with a sparse combination of the atoms. This paper focuses on the K-SVD-based image denoising algorithm. The implementation is described in detail and its parameters are analyzed and varied to come up with a reliable implementation.

  1. A hyperspectral imaging prototype for online quality evaluation of pickling cucumbers

    Science.gov (United States)

    A hyperspectral imaging prototype was developed for online evaluation of external and internal quality of pickling cucumbers. The prototype had several new, unique features including simultaneous reflectance and transmittance imaging and inline, real time calibration of hyperspectral images of each ...

  2. On-line structure-lossless digital mammogram image compression

    Science.gov (United States)

    Wang, Jun; Huang, H. K.

    1996-04-01

    This paper proposes a novel on-line structure lossless compression method for digital mammograms during the film digitization process. The structure-lossless compression segments the breast and the background, compresses the former with a predictive lossless coding method and discards the latter. This compression scheme is carried out during the film digitization process and no additional time is required for the compression. Digital mammograms are compressed on-the-fly while they are created. During digitization, lines of scanned data are first acquired into a small temporary buffer in the scanner, then they are transferred to a large image buffer in an acquisition computer which is connected to the scanner. The compression process, running concurrently with the digitization process in the acquisition computer, constantly checks the image buffer and compresses any newly arrived data. Since compression is faster than digitization, data compression is completed as soon as digitization is finished. On-line compression during digitization does not increase overall digitizing time. Additionally, it reduces the mammogram image size by a factor of 3 to 9 with no loss of information. This algorithm has been implemented in a film digitizer. Statistics were obtained based on digitizing 46 mammograms at four sampling distances from 50 to 200 microns.

  3. Imaging the internal structure of fluid upflow zones with detailed digital Parasound echosounder surveys

    Science.gov (United States)

    Spiess, V.; Zuehlsdorff, L.; von Lom-Keil, H.; Schwenk, T.

    2001-12-01

    Sites of venting fluids both with continuous and episodic supply often reveal complex surface and internal structures, which are difficult to image and cause problems to transfer results from local sampling towards a structural reconstruction and a quantification of (average) flux rates. Detailed acoustic and seismic surveys would be required to retrieve this information, but also an appropriate environment, where fluid migration can be properly imaged from contrasts to unaffected areas. Hemipelagic sediments are most suitable, since typically reflectors are coherent and of low lateral amplitude variation and structures are continuous over distances much longer than the scale of fluid migration features. During RV Meteor Cruise M473 and RV Sonne Cruise SO 149 detailed studies were carried out in the vicinity of potential fluid upflow zones in the Lower Congo Basin at 5oS in 3000 m water depth and at the Northern Cascadia Margin in 1000 m water depth. Unexpected sampling of massive gas hydrates from the sea floor as well as of carbonate concretions, shell fragments and different liveforms indicated active fluid venting in a typically hemipelagic realm. The acoustic signature of such zones includes columnar blanking, pockmark depressions at the sea floor, association with small offset faults (ParaDigMA System for further processing and display, to image the spatial structure of the upflow zones. Due to the high data density amplitudes and other acoustic properties could be investigated in a 3D volume and time slices as well as reflector surfaces were analyzed. Pronounced lateral variations of reflection amplitudes within a complex pattern indicate potential pathways for fluid/gas migration and occurrences of near-surface gas hydrate deposits, which may be used to trace detailed surface evidence from side scan sonar imaging down to depth and support dedicated sampling.

  4. MIDA: A Multimodal Imaging-Based Detailed Anatomical Model of the Human Head and Neck.

    Directory of Open Access Journals (Sweden)

    Maria Ida Iacono

    Full Text Available Computational modeling and simulations are increasingly being used to complement experimental testing for analysis of safety and efficacy of medical devices. Multiple voxel- and surface-based whole- and partial-body models have been proposed in the literature, typically with spatial resolution in the range of 1-2 mm and with 10-50 different tissue types resolved. We have developed a multimodal imaging-based detailed anatomical model of the human head and neck, named "MIDA". The model was obtained by integrating three different magnetic resonance imaging (MRI modalities, the parameters of which were tailored to enhance the signals of specific tissues: i structural T1- and T2-weighted MRIs; a specific heavily T2-weighted MRI slab with high nerve contrast optimized to enhance the structures of the ear and eye; ii magnetic resonance angiography (MRA data to image the vasculature, and iii diffusion tensor imaging (DTI to obtain information on anisotropy and fiber orientation. The unique multimodal high-resolution approach allowed resolving 153 structures, including several distinct muscles, bones and skull layers, arteries and veins, nerves, as well as salivary glands. The model offers also a detailed characterization of eyes, ears, and deep brain structures. A special automatic atlas-based segmentation procedure was adopted to include a detailed map of the nuclei of the thalamus and midbrain into the head model. The suitability of the model to simulations involving different numerical methods, discretization approaches, as well as DTI-based tensorial electrical conductivity, was examined in a case-study, in which the electric field was generated by transcranial alternating current stimulation. The voxel- and the surface-based versions of the models are freely available to the scientific community.

  5. MIDA: A Multimodal Imaging-Based Detailed Anatomical Model of the Human Head and Neck.

    Science.gov (United States)

    Iacono, Maria Ida; Neufeld, Esra; Akinnagbe, Esther; Bower, Kelsey; Wolf, Johanna; Vogiatzis Oikonomidis, Ioannis; Sharma, Deepika; Lloyd, Bryn; Wilm, Bertram J; Wyss, Michael; Pruessmann, Klaas P; Jakab, Andras; Makris, Nikos; Cohen, Ethan D; Kuster, Niels; Kainz, Wolfgang; Angelone, Leonardo M

    2015-01-01

    Computational modeling and simulations are increasingly being used to complement experimental testing for analysis of safety and efficacy of medical devices. Multiple voxel- and surface-based whole- and partial-body models have been proposed in the literature, typically with spatial resolution in the range of 1-2 mm and with 10-50 different tissue types resolved. We have developed a multimodal imaging-based detailed anatomical model of the human head and neck, named "MIDA". The model was obtained by integrating three different magnetic resonance imaging (MRI) modalities, the parameters of which were tailored to enhance the signals of specific tissues: i) structural T1- and T2-weighted MRIs; a specific heavily T2-weighted MRI slab with high nerve contrast optimized to enhance the structures of the ear and eye; ii) magnetic resonance angiography (MRA) data to image the vasculature, and iii) diffusion tensor imaging (DTI) to obtain information on anisotropy and fiber orientation. The unique multimodal high-resolution approach allowed resolving 153 structures, including several distinct muscles, bones and skull layers, arteries and veins, nerves, as well as salivary glands. The model offers also a detailed characterization of eyes, ears, and deep brain structures. A special automatic atlas-based segmentation procedure was adopted to include a detailed map of the nuclei of the thalamus and midbrain into the head model. The suitability of the model to simulations involving different numerical methods, discretization approaches, as well as DTI-based tensorial electrical conductivity, was examined in a case-study, in which the electric field was generated by transcranial alternating current stimulation. The voxel- and the surface-based versions of the models are freely available to the scientific community.

  6. Complex distal insertions of the tibialis posterior tendon: detailed anatomic and MR imaging investigation in cadavers

    Energy Technology Data Exchange (ETDEWEB)

    Pastore, Daniel; Cerri, Giovanni G. [University of Sao Paulo, Department of Radiology, Sao Paulo, Sao Paulo (Brazil); VA Medical Center, University of California, Department of Radiology, San Diego, CA (United States); Dirim, Berna; Wangwinyuvirat, Mani; Belentani, Clarissa L.; Trudell, Debra J.; Resnick, Donald L. [VA Medical Center, University of California, Department of Radiology, San Diego, CA (United States); Haghighi, Parviz [VA Medical Center, University of California, Department of Radiology, San Diego, CA (United States); VA Medical Center, University of California, Department of Histology, San Diego, CA (United States)

    2008-09-15

    The purpose of this report was to demonstrate the normal complex insertional anatomy of the tibialis posterior tendon (TPT) in cadavers using magnetic resonance (MR) imaging with anatomic and histologic correlation. Ten cadaveric ankles were used according to institutional guidelines. MR T1-weighted spin echo imaging was performed to demonstrate aspects of the complex anatomic distal insertions of the TPT in cadaveric specimens. Findings on MR imaging were correlated with those derived from anatomic and histologic study. Generally, the TPT revealed a low signal in all MR images, except near the level of the medial malleolus, where the TPT suddenly changed direction and ''magic angle'' artifact could be observed. In five out of ten specimens (50%), a type I accessory navicular bone was found in the TPT. In all cases with a type I accessory navicular bone, the TPT had an altered signal in this area. Axial and coronal planes on MR imaging were the best in identifying the distal insertions of the TPT. A normal division of the TPT was observed just proximal to the insertion into the navicular bone in five specimens (100%) occurring at a maximum proximal distance from its attachment to the navicular bone of approximately 1.5 to 2 cm. In the other five specimens, in which a type I accessory navicular bone was present, the TPT directly inserted into the accessory bone and a slip less than 1.5 mm in thickness could be observed attaching to the medial aspect of the navicular bone (100%). Anatomic inspection confirmed the sites of the distal insertions of the components of the TPT. MR imaging enabled detailed analysis of the complex distal insertions of the TPT as well as a better understanding of those features of its insertion that can simulate a lesion. (orig.)

  7. Novel cryo-imaging of the glioma tumor microenvironment reveals migration and dispersal pathways in vivid three-dimensional detail

    OpenAIRE

    Burden-Gulley, Susan M.; Qutaish, Mohammed Q.; Sullivant, Kristin E.; Lu, Hong; Wang, Jing; Craig, Sonya E. L.; Basilion, James P.; Wilson, David L.; Brady-Kalnay, Susann M

    2011-01-01

    Traditional methods of imaging cell migration in the tumor microenvironment include serial sections of xenografts and standard histological stains. Current molecular imaging techniques suffer from low resolution and difficulty in imaging through the skull. Here we show how computer algorithms can be used to reconstruct images from tissue sections obtained from mouse xenograft models of human glioma and can be rendered into 3-D images offering exquisite anatomic detail of tumor cell dispersal....

  8. SMaRT-OnlineWDN D3.1: Detailed specification of the performance criteria and application of sensor placement

    OpenAIRE

    Piller, O.; Deuerlein, J.; Bernard, T; Sedehizade, F.

    2014-01-01

    Drinking water distribution networks are exposed to malicious or accidental contamination. Several levels of responses are conceivable. One of them consists of installing a sensor network to monitor the system in real time. Once a contamination has been detected, it is also important to take appropriate counter-measures. The SMaRT-OnlineWDN project relies on modelling to predict both hydraulics and water quality. An online model makes it possible to identify the contaminant source and perform...

  9. Testing & Validating: 3D Seismic Travel Time Tomography (Detailed Shallow Subsurface Imaging)

    Science.gov (United States)

    Marti, David; Marzan, Ignacio; Alvarez-Marron, Joaquina; Carbonell, Ramon

    2016-04-01

    A detailed full 3 dimensional P wave seismic velocity model was constrained by a high-resolution seismic tomography experiment. A regular and dense grid of shots and receivers was use to image a 500x500x200 m volume of the shallow subsurface. 10 GEODE's resulting in a 240 channels recording system and a 250 kg weight drop were used for the acquisition. The recording geometry consisted in 10x20m geophone grid spacing, and a 20x20 m stagered source spacing. A total of 1200 receivers and 676 source points. The study area is located within the Iberian Meseta, in Villar de Cañas (Cuenca, Spain). The lithological/geological target consisted in a Neogen sedimentary sequence formed from bottom to top by a transition from gyspum to silstones. The main objectives consisted in resolving the underground structure: contacts/discontinuities; constrain the 3D geometry of the lithology (possible cavities, faults/fractures). These targets were achieved by mapping the 3D distribution of the physical properties (P-wave velocity). The regularly space dense acquisition grid forced to acquire the survey in different stages and with a variety of weather conditions. Therefore, a careful quality control was required. More than a half million first arrivals were inverted to provide a 3D Vp velocity model that reached depths of 120 m in the areas with the highest ray coverage. An extended borehole campaign, that included borehole geophysical measurements in some wells provided unique tight constraints on the lithology an a validation scheme for the tomographic results. The final image reveals a laterally variable structure consisting of four different lithological units. In this methodological validation test travel-time tomography features a high capacity of imaging in detail the lithological contrasts for complex structures located at very shallow depths.

  10. Processing of Uav Based Range Imaging Data to Generate Detailed Elevation Models of Complex Natural Structures

    Science.gov (United States)

    Kohoutek, T. K.; Eisenbeiss, H.

    2012-07-01

    Unmanned Aerial Vehicles (UAVs) are more and more used in civil areas like geomatics. Autonomous navigated platforms have a great flexibility in flying and manoeuvring in complex environments to collect remote sensing data. In contrast to standard technologies such as aerial manned platforms (airplanes and helicopters) UAVs are able to fly closer to the object and in small-scale areas of high-risk situations such as landslides, volcano and earthquake areas and floodplains. Thus, UAVs are sometimes the only practical alternative in areas where access is difficult and where no manned aircraft is available or even no flight permission is given. Furthermore, compared to terrestrial platforms, UAVs are not limited to specific view directions and could overcome occlusions from trees, houses and terrain structures. Equipped with image sensors and/or laser scanners they are able to provide elevation models, rectified images, textured 3D-models and maps. In this paper we will describe a UAV platform, which can carry a range imaging (RIM) camera including power supply and data storage for the detailed mapping and monitoring of complex structures, such as alpine riverbed areas. The UAV platform NEO from Swiss UAV was equipped with the RIM camera CamCube 2.0 by PMD Technologies GmbH to capture the surface structures. Its navigation system includes an autopilot. To validate the UAV-trajectory a 360° prism was installed and tracked by a total station. Within the paper a workflow for the processing of UAV-RIM data is proposed, which is based on the processing of differential GNSS data in combination with the acquired range images. Subsequently, the obtained results for the trajectory are compared and verified with a track of a UAV (Falcon 8, Ascending Technologies) carried out with a total station simultaneously to the GNSS data acquisition. The results showed that the UAV's position using differential GNSS could be determined in the centimetre to the decimetre level. The RIM

  11. On-line range images registration with GPGPU

    Science.gov (United States)

    Będkowski, J.; Naruniec, J.

    2013-03-01

    This paper concerns implementation of algorithms in the two important aspects of modern 3D data processing: data registration and segmentation. Solution proposed for the first topic is based on the 3D space decomposition, while the latter on image processing and local neighbourhood search. Data processing is implemented by using NVIDIA compute unified device architecture (NIVIDIA CUDA) parallel computation. The result of the segmentation is a coloured map where different colours correspond to different objects, such as walls, floor and stairs. The research is related to the problem of collecting 3D data with a RGB-D camera mounted on a rotated head, to be used in mobile robot applications. Performance of the data registration algorithm is aimed for on-line processing. The iterative closest point (ICP) approach is chosen as a registration method. Computations are based on the parallel fast nearest neighbour search. This procedure decomposes 3D space into cubic buckets and, therefore, the time of the matching is deterministic. First technique of the data segmentation uses accele-rometers integrated with a RGB-D sensor to obtain rotation compensation and image processing method for defining pre-requisites of the known categories. The second technique uses the adapted nearest neighbour search procedure for obtaining normal vectors for each range point.

  12. Dimensional Description of On-line Wear Debris Images for Wear Characterization

    Institute of Scientific and Technical Information of China (English)

    WU Tonghai; PENG Yeping; DU Ying; WANG Junqun

    2014-01-01

    As one of the most wear monitoring indicator, dimensional feature of individual particles has been studied mostly focusing on off-line analytical ferrograph. Recent development in on-line wear monitoring with wear debris images shows that merely wear debris concentration has been extracted from on-line ferrograph images. It remains a bottleneck of obtaining the dimension of on-line particles due to the low resolution, high contamination and particle’s chain pattern of an on-line image sample. In this work, statistical dimension of wear debris in on-line ferrograph images is investigated. A two-step procedure is proposed as follows. First, an on-line ferrograph image is decomposed into four component images with different frequencies. By doing this, the size of each component image is reduced by one fourth, which will increase the efficiency of subsequent processing. The low-frequency image is used for extracting the area of wear debris, and the high-frequency image is adopted for extracting contour. Second, a statistical equivalent circle dimension is constructed by equaling the overall wear debris in the image into equivalent circles referring to the extracted total area and premeter of overall wear debris. The equivalent circle dimension, reflecting the statistical dimension of larger wear debris in an on-line image, is verified by manual measurement. Consequently, two preliminary applications are carried out in gasoline engine bench tests of durability and running-in. Evidently, the equivalent circle dimension, together with the previously developed concentration index, index of particle coverage area (IPCA), show good performances in characterizing engine wear conditions. The proposed dimensional indicator provides a new statistical feature of on-line wear particles for on-line wear monitoring. The new dimensional feature conveys profound information about wear severity.

  13. Investigation on improved infrared image detail enhancement algorithm based on adaptive histogram statistical stretching and gradient filtering

    Science.gov (United States)

    Zeng, Bangze; Zhu, Youpan; Li, Zemin; Hu, Dechao; Luo, Lin; Zhao, Deli; Huang, Juan

    2014-11-01

    Duo to infrared image with low contrast, big noise and unclear visual effect, target is very difficult to observed and identified. This paper presents an improved infrared image detail enhancement algorithm based on adaptive histogram statistical stretching and gradient filtering (AHSS-GF). Based on the fact that the human eyes are very sensitive to the edges and lines, the author proposed to extract the details and textures by using the gradient filtering. New histogram could be acquired by calculating the sum of original histogram based on fixed window. With the minimum value for cut-off point, author carried on histogram statistical stretching. After the proper weights given to the details and background, the detail-enhanced results could be acquired finally. The results indicate image contrast could be improved and the details and textures could be enhanced effectively as well.

  14. Evaluation of a software package for automated quality assessment of contrast detail images--comparison with subjective visual assessment.

    Science.gov (United States)

    Pascoal, A; Lawinski, C P; Honey, I; Blake, P

    2005-12-07

    Contrast detail analysis is commonly used to assess image quality (IQ) associated with diagnostic imaging systems. Applications include routine assessment of equipment performance and optimization studies. Most frequently, the evaluation of contrast detail images involves human observers visually detecting the threshold contrast detail combinations in the image. However, the subjective nature of human perception and the variations in the decision threshold pose limits to the minimum image quality variations detectable with reliability. Objective methods of assessment of image quality such as automated scoring have the potential to overcome the above limitations. A software package (CDRAD analyser) developed for automated scoring of images produced with the CDRAD test object was evaluated. Its performance to assess absolute and relative IQ was compared with that of an average observer. Results show that the software does not mimic the absolute performance of the average observer. The software proved more sensitive and was able to detect smaller low-contrast variations. The observer's performance was superior to the software's in the detection of smaller details. Both scoring methods showed frequent agreement in the detection of image quality variations resulting from changes in kVp and KERMA(detector), which indicates the potential to use the software CDRAD analyser for assessment of relative IQ.

  15. Evaluation of a software package for automated quality assessment of contrast detail images-comparison with subjective visual assessment

    Energy Technology Data Exchange (ETDEWEB)

    Pascoal, A [Medical Engineering and Physics, King' s College London, Faraday Building Denmark Hill, London SE5 8RX (Denmark); Lawinski, C P [KCARE - King' s Centre for Assessment of Radiological Equipment, King' s College Hospital, Faraday Building Denmark Hill, London SE5 8RX (Denmark); Honey, I [KCARE - King' s Centre for Assessment of Radiological Equipment, King' s College Hospital, Faraday Building Denmark Hill, London SE5 8RX (Denmark); Blake, P [KCARE - King' s Centre for Assessment of Radiological Equipment, King' s College Hospital, Faraday Building Denmark Hill, London SE5 8RX (Denmark)

    2005-12-07

    Contrast detail analysis is commonly used to assess image quality (IQ) associated with diagnostic imaging systems. Applications include routine assessment of equipment performance and optimization studies. Most frequently, the evaluation of contrast detail images involves human observers visually detecting the threshold contrast detail combinations in the image. However, the subjective nature of human perception and the variations in the decision threshold pose limits to the minimum image quality variations detectable with reliability. Objective methods of assessment of image quality such as automated scoring have the potential to overcome the above limitations. A software package (CDRAD analyser) developed for automated scoring of images produced with the CDRAD test object was evaluated. Its performance to assess absolute and relative IQ was compared with that of an average observer. Results show that the software does not mimic the absolute performance of the average observer. The software proved more sensitive and was able to detect smaller low-contrast variations. The observer's performance was superior to the software's in the detection of smaller details. Both scoring methods showed frequent agreement in the detection of image quality variations resulting from changes in kVp and KERMA{sub detector}, which indicates the potential to use the software CDRAD analyser for assessment of relative IQ.

  16. Role of online education in building brand image of educational institutions

    Directory of Open Access Journals (Sweden)

    Parikshat S. Manhas

    2012-06-01

    Full Text Available In this article we try to present the general impression that online learning/real time virtual learning conveys. The myriad interpretations of online education are depicted elaborately along with its advantages and influence on various stakeholders. The disadvantages of online education reveal their apparently potent drawbacks, which are then trailed by «opposing views». These views give concrete justifications against the so-called shortcomings of online learning and enlist the techniques used to tackle them. Besides of what online education does for students, learners and tutors at large, it also confers some potential by-products, such as helping build a strong brand image of educational institutions that offer it. Although educational institutions worldwide are employing online learning resources to create a brand image for themselves, a well-worn discussion has to be mooted to understand the implications of their usage.

  17. Comparison of low-contrast detail perception on storage phosphor radiographs and digital flat panel detector images.

    Science.gov (United States)

    Peer, S; Neitzel, U; Giacomuzzi, S M; Peer, R; Gassner, E; Steingruber, I; Jaschke, W

    2001-03-01

    A contrast detail analysis was performed to compare perception of low-contrast details on X-ray images derived from digital storage phosphor radiography and from a flat panel detector system based on a cesium iodide/amorphous silicon matrix. The CDRAD 2.0 phantom was used to perform a comparative contrast detail analysis of a clinical storage phosphor radiography system and an indirect type digital flat panel detector unit. Images were acquired at exposure levels comparable to film speeds of 50/100/200/400 and 800. Four observers evaluated a total of 50 films with respect to the threshold contrast for each detail size. The numbers of correctly identified objects were determined for all image subsets. The overall results show that low-contrast detail perception with digital flat panel detector images is better than with state of the art storage phosphor screens. This is especially true for the low-exposure setting, where a nearly 10% higher correct observation ratio is reached. Given its high detective quantum efficiency the digital flat panel technology based on the cesium iodide scintillator/amorphous silicon matrix is best suited for detection of low-contrast detail structures, which shows its high potential for clinical imaging.

  18. New Media, Old Images: Constructing Online Representations of Women and Men in Science, Engineering and Technology

    Science.gov (United States)

    Mendick, Heather; Moreau, Marie-Pierre

    2013-01-01

    This paper looks at online representations of women and men in science, engineering and technology. We show that these representations largely re/produce dominant gender discourses. We then focus on the question: How are gender cliched images re/produced online? Drawing on a discursive analysis of data from six interviews with web authors, we…

  19. New Media, Old Images: Constructing Online Representations of Women and Men in Science, Engineering and Technology

    Science.gov (United States)

    Mendick, Heather; Moreau, Marie-Pierre

    2013-01-01

    This paper looks at online representations of women and men in science, engineering and technology. We show that these representations largely re/produce dominant gender discourses. We then focus on the question: How are gender cliched images re/produced online? Drawing on a discursive analysis of data from six interviews with web authors, we…

  20. Feature Extraction in Sequential Multimedia Images: with Applications in Satellite Images and On-line Videos

    Science.gov (United States)

    Liang, Yu-Li

    Multimedia data is increasingly important in scientific discovery and people's daily lives. Content of massive multimedia is often diverse and noisy, and motion between frames is sometimes crucial in analyzing those data. Among all, still images and videos are commonly used formats. Images are compact in size but do not contain motion information. Videos record motion but are sometimes too big to be analyzed. Sequential images, which are a set of continuous images with low frame rate, stand out because they are smaller than videos and still maintain motion information. This thesis investigates features in different types of noisy sequential images, and the proposed solutions that intelligently combined multiple features to successfully retrieve visual information from on-line videos and cloudy satellite images. The first task is detecting supraglacial lakes above ice sheet in sequential satellite images. The dynamics of supraglacial lakes on the Greenland ice sheet deeply affect glacier movement, which is directly related to sea level rise and global environment change. Detecting lakes above ice is suffering from diverse image qualities and unexpected clouds. A new method is proposed to efficiently extract prominent lake candidates with irregular shapes, heterogeneous backgrounds, and in cloudy images. The proposed system fully automatize the procedure that track lakes with high accuracy. We further cooperated with geoscientists to examine the tracked lakes and found new scientific findings. The second one is detecting obscene content in on-line video chat services, such as Chatroulette, that randomly match pairs of users in video chat sessions. A big problem encountered in such systems is the presence of flashers and obscene content. Because of various obscene content and unstable qualities of videos capture by home web-camera, detecting misbehaving users is a highly challenging task. We propose SafeVchat, which is the first solution that achieves satisfactory

  1. Morphological features and associated anomalies of schizencephaly in the clinical population: detailed analysis of MR images

    Energy Technology Data Exchange (ETDEWEB)

    Hayashi, N. [Department of Radiology, Faculty of Medicine, University of Tokyo (Japan); Department of Radiology, Section of Neuroradiology, University of California San Francisco, CA (United States); Tsutsumi, Y. [Department of Radiology, National Okura Hospital, Tokyo (Japan); Barkovich, A.J. [Department of Radiology, Section of Neuroradiology, University of California San Francisco, CA (United States)

    2002-05-01

    Although they are well documented in autopsy series, the macroscopic features and associated anomalies of schizencephalies have not been described in detail in a large clinical population. To assess the macroscopic findings of schizencephaly and the prevalence of associated findings, we conducted a retrospective MR analysis of a group of patients with schizencephaly. The MR studies of 35 patients with schizencephaly were retrospectively reviewed. The images were examined for the location and size of the schizencephalic cleft, the presence and location of associated polymicrogyria, and the presence, location, and severity of other brain anomalies. A total of 54 schizencephalic clefts were seen in the 35 patients. These clefts were unilateral in 18 (51%) patients and bilateral in 17 (49%) patients; three clefts were identified in two patients. Nine clefts (17%) had fused lips and 45 had separated-lip clefts (83%). Polymicrogyria was present inside 23 clefts (43%), while subependymal heterotopias were present at the cleft orifice in 27 clefts (50%). Polymicrogyria was identified outside the cleft, both adjacent to and remote from the cleft, in 23 patients (66%). Abnormal cerebral white-matter signal intensity was present in seven patients (20%), while white-matter volume diminution was noted in all patients. Ventricular diverticula with mass effect, roofing membranes, remnant floors, and cord-like remnants were present in 12, 1, 11, and 3 patients, respectively. Our results show that the spectrum of macroscopic findings in schizencephaly includes fused-lip and separated-lip clefts, polymicrogyric and non-polymicrogyric cleft linings, cyst-like diverticula and membranous structures, and subependymal heterotopia at the cleft. Concomitant anomalies are polymicrogyria outside the cleft, white-matter diminution, septal and optic pathway anomalies, callosal anomalies and hippocampal anomalies. Unilateral and bilateral clefts occur in a nearly equal frequency in the clinical

  2. The level of detail required in a deformable phantom to accurately perform quality assurance of deformable image registration

    Science.gov (United States)

    Saenz, Daniel L.; Kim, Hojin; Chen, Josephine; Stathakis, Sotirios; Kirby, Neil

    2016-09-01

    The primary purpose of the study was to determine how detailed deformable image registration (DIR) phantoms need to adequately simulate human anatomy and accurately assess the quality of DIR algorithms. In particular, how many distinct tissues are required in a phantom to simulate complex human anatomy? Pelvis and head-and-neck patient CT images were used for this study as virtual phantoms. Two data sets from each site were analyzed. The virtual phantoms were warped to create two pairs consisting of undeformed and deformed images. Otsu’s method was employed to create additional segmented image pairs of n distinct soft tissue CT number ranges (fat, muscle, etc). A realistic noise image was added to each image. Deformations were applied in MIM Software (MIM) and Velocity deformable multi-pass (DMP) and compared with the known warping. Images with more simulated tissue levels exhibit more contrast, enabling more accurate results. Deformation error (magnitude of the vector difference between known and predicted deformation) was used as a metric to evaluate how many CT number gray levels are needed for a phantom to serve as a realistic patient proxy. Stabilization of the mean deformation error was reached by three soft tissue levels for Velocity DMP and MIM, though MIM exhibited a persisting difference in accuracy between the discrete images and the unprocessed image pair. A minimum detail of three levels allows a realistic patient proxy for use with Velocity and MIM deformation algorithms.

  3. The Influence of Emag Image Brand Among Resita's Online Consumers

    Directory of Open Access Journals (Sweden)

    Gabriel Dinu

    2016-01-01

    Full Text Available The need for a strong brand in the online environment should be among the first steps to takeinto consideration while you want to grow a business. For a brand , one of the most importantmissions , especially in the online strategies is to define an identity , a "voice", that is easilyrecognizable. This identity must be the basis that you are using on all social networks and on allthe strategies.

  4. A Novel Image Steganography Technique for Secured Online Transaction Using DWT and Visual Cryptography

    Science.gov (United States)

    Anitha Devi, M. D.; ShivaKumar, K. B.

    2017-08-01

    Online payment eco system is the main target especially for cyber frauds. Therefore end to end encryption is very much needed in order to maintain the integrity of secret information related to transactions carried online. With access to payment related sensitive information, which enables lot of money transactions every day, the payment infrastructure is a major target for hackers. The proposed system highlights, an ideal approach for secure online transaction for fund transfer with a unique combination of visual cryptography and Haar based discrete wavelet transform steganography technique. This combination of data hiding technique reduces the amount of information shared between consumer and online merchant needed for successful online transaction along with providing enhanced security to customer’s account details and thereby increasing customer’s confidence preventing “Identity theft” and “Phishing”. To evaluate the effectiveness of proposed algorithm Root mean square error, Peak signal to noise ratio have been used as evaluation parameters

  5. Novel response function resolves by image deconvolution more details of surface nanomorphology

    DEFF Research Database (Denmark)

    Andersen, Jens Enevold Thaulov

    2010-01-01

    A novel method of image processing is presented which relies on deconvolution of data using the response function of the apparatus. It is revealed that all the surface structures observed by digital imaging are generated by a convolution of the response function of the apparatus with the surfaces......’ nanomorphology, which provided images of convoluted physical structures rather than images of real physical structures. In order to restore the genuine physical information on surface structures, a deconvolution using a novel response function of the feedback circuitry is required. At the highest resolution......, that is, atomic resolution, the effect of deconvolution is at its maximum, whereas images at lower resolution are sharpened by eliminating smoothing effects and shadow effects. The method is applied to measurements of imaging by in situ scanning tunnelling microscopy (in situ STM) at atomic resolution...

  6. On-Line Hyperspectral Transmittance Imaging for Internal Defect Detection of Pickling Cucumbers

    Science.gov (United States)

    Hyperspectral imaging technique under transmittance mode was investigated for detection of internal defect in pickling cucumbers such as carpel suture separation or hollow cucumbers caused by mechanical stress. A prototype of on-line hyperspectral transmittance imaging system was developed for real...

  7. Evaluation of Online/Offline Image Guidance/Adaptation Approaches for Prostate Cancer Radiation Therapy

    Energy Technology Data Exchange (ETDEWEB)

    Qin, An [Department of Radiation Oncology, Beaumont Health System, Royal Oak, Michigan (United States); Sun, Ying [Department of Radiotherapy, Cancer Center, Sun Yat-sen University, Guangzhou (China); Liang, Jian [Department of Radiation Oncology, Beaumont Health System, Royal Oak, Michigan (United States); Yan, Di, E-mail: dyan@beaumont.edu [Department of Radiation Oncology, Beaumont Health System, Royal Oak, Michigan (United States)

    2015-04-01

    Purpose: To evaluate online/offline image-guided/adaptive treatment techniques for prostate cancer radiation therapy with daily cone-beam CT (CBCT) imaging. Methods and Materials: Three treatment techniques were evaluated retrospectively using daily pre- and posttreatment CBCT images on 22 prostate cancer patients. Prostate, seminal vesicles (SV), rectal wall, and bladder were delineated on all CBCT images. For each patient, a pretreatment intensity modulated radiation therapy plan with clinical target volume (CTV) = prostate + SV and planning target volume (PTV) = CTV + 3 mm was created. The 3 treatment techniques were as follows: (1) Daily Correction: The pretreatment intensity modulated radiation therapy plan was delivered after online CBCT imaging, and position correction; (2) Online Planning: Daily online inverse plans with 3-mm CTV-to-PTV margin were created using online CBCT images, and delivered; and (3) Hybrid Adaption: Daily Correction plus an offline adaptive inverse planning performed after the first week of treatment. The adaptive plan was delivered for all remaining 15 fractions. Treatment dose for each technique was constructed using the daily posttreatment CBCT images via deformable image registration. Evaluation was performed using treatment dose distribution in target and critical organs. Results: Treatment equivalent uniform dose (EUD) for the CTV was within [85.6%, 100.8%] of the pretreatment planned target EUD for Daily Correction; [98.7%, 103.0%] for Online Planning; and [99.2%, 103.4%] for Hybrid Adaptation. Eighteen percent of the 22 patients in Daily Correction had a target dose deficiency >5%. For rectal wall, the mean ± SD of the normalized EUD was 102.6% ± 2.7% for Daily Correction, 99.9% ± 2.5% for Online Planning, and 100.6% ± 2.1% for Hybrid Adaptation. The mean ± SD of the normalized bladder EUD was 108.7% ± 8.2% for Daily Correction, 92.7% ± 8.6% for Online Planning, and 89.4% ± 10.8% for Hybrid

  8. Integration of Point Clouds Originated from Laser Scaner and Photogrammetric Images for Visualization of Complex Details of Historical Buildings

    Science.gov (United States)

    Altuntas, C.

    2015-02-01

    Three-dimensional (3D) models of historical buildings are created for documentation and virtual realization of them. Laser scanning and photogrammetry are extensively used to perform for these aims. The selection of the method that will be used in threedimensional modelling study depends on the scale and shape of the object, and also applicability of the method. Laser scanners are high cost instruments. However, the cameras are low cost instruments. The off-the-shelf cameras are used for taking the photogrammetric images. The camera is imaging the object details by carrying on hand while the laser scanner makes ground based measurement. Laser scanner collect high density spatial data in a short time from the measurement area. On the other hand, image based 3D (IB3D) measurement uses images to create 3D point cloud data. The image matching and the creation of the point cloud can be done automatically. Historical buildings include more complex details. Thus, all details cannot be measured by terrestrial laser scanner (TLS) due to the blocking the details with each others. Especially, the artefacts which have complex shapes cannot be measured in full details. They cause occlusion on the point cloud model. However it is possible to record photogrammetric images and creation IB3D point cloud for these areas. Thus the occlusion free 3D model is created by the integration of point clouds originated from the TLS and photogrammetric images. In this study, usability of laser scanning in conjunction with image based modelling for creation occlusion free three-dimensional point cloud model of historical building was evaluated. The IB3D point cloud was created in the areas that could not been measured by TLS. Then laser scanning and IB3D point clouds were integrated in the common coordinate system. The registration point clouds were performed with the iterative closest point (ICP) and georeferencing methods. Accuracy of the registration was evaluated by convergency and its

  9. Current Practice vs. Guideline Based Imaging in Abdominal Radiology in the German Speaking Area: Results of an Online Survey.

    Science.gov (United States)

    Schreyer, A G; Wessling, J; Grenacher, L

    2016-03-01

    The working group for abdominal imaging within the German Roentgen Society (DRG) performed an online survey amongst radiologist concerning the current status of techniques for abdominal imaging. The results of this survey were compared with the most recent guidelines. We performed an online survey open for all members of the DRG during a 76-day period with 65 questions and an overall estimated time for finishing the questionnaire of 15 minutes concerning technical specifications for abdominal radiological imaging. The results were evaluated using descriptive statistics. 90 of all participants, who filled out the survey covering more than 80% of the questions, were included in the statistical evaluation. 27% of all participants were registered radiologists while 73% represented radiologists working in a hospital. Most participants worked in a managerial position. The participants gave detailed information regarding the radiological techniques used in dedicated organ systems (esophagus, stomach, pancreas, liver, small intestines, colon) regarding acquired contrast phases and oral and intravenous administration of contrast medium. The results confirm that most radiologists participating in this survey perform their examinations and choose their modalities in conformity with the current existing clinical guidelines. Because most clinical guidelines do not specify radiological examinations in detail, there is a noteworthy heterogeneity of the acquired contrast phases and major divergence in terms of technical parameters. Therefore a joint radiological effort should be initiated for developing and publishing updated radiological parameters for abdominal imaging. • In German speaking countries indications for abdominal radiological examinations are performed with a high compliance to published guidelines. • There is a significant heterogeneity regarding the acquisition of different contrast phases for parenchymal abdominal organs. • There is an urgent need to

  10. Kodak Picture Exchange--Online Access to Photographs and Images.

    Science.gov (United States)

    Valauskas, Edward J.

    1995-01-01

    Describes the Kodak Picture Exchange that includes a database of over 200,000 photographic images collected from 28 stock photography companies in the United States that allows the user to search for images by topic. Highlights include installing the software, alternative search strategies, costs, manipulating images, and rules governing the use…

  11. Detailed Study of Defects in Silicon Solar Cells by Cathodoluminescence Spectrum Imaging: Preprint

    Energy Technology Data Exchange (ETDEWEB)

    Romero, M. J.; Ostapenko, S.; Al-Jassim, M. M.; Tarasov, I.; Sheldon, P.

    2003-08-01

    We have recently developed a spectrum imaging system for cathodoluminescence (CLsi) at NREL, which has been successfully applied to different semiconductors. The advanced multi-channel detection required for CLsi consists of an ultrafast spectrum acquisition triggered by the electron beam during scanning. Spectra are acquired either with a Roper Scientific silicon EEV-1340400 cryogenic CCD or an InGaAs 5121 cryogenic PDA, depending on the range of spectral emission. Acquisition times by pixel are typically of 10 to 20 ms (180 seconds for a 100100 pixel image). The output of spectrum imaging measurements is thus represented by a series of emission spectra. CCDIMAG, the software developed for CLsi, processes this spectrum series to reconstruct monochromatic images or extract the spectrum from any area on the image. This system is operated on the JEOL-5800 scanning electron microscope (SEM). CLsi measurements can be performed at temperatures between 15 K and 300 K. A low-vibration ARS Displex DE-202 closed-circuit cryostat provides cryogenic operation. The interface for vibration isolation has been developed to be compatible with SEM observation.

  12. Online political communication: the role of image upload on Facebook

    OpenAIRE

    Nicoleta IONESCU (EFTENE)

    2013-01-01

    The aim of this paper is to determine how the transition from offline to online channels is reflecting upon political communication. The change of medium brings along a change of discourse. The visual form of communication is gaining in importance while the visual social media marketing is contouring as a new trend, along with the rise of social media. The discussion about how different the industrial media and the social media are will eventually lead to the economic aspects, underlying the ...

  13. Valuation of imaging centers: alternative methods and detailed description of the discounted cash flow approach.

    Science.gov (United States)

    Russell, Philip J

    2007-01-01

    Medical imaging centers are an increasingly integral part of the medical services landscape in America. There are many instances in which owners and potential buyers of these enterprises want to ascertain the value of the businesses. There is an industry of professionals who provide expert valuation services for many types of businesses using various recognized alternative methods, some of which are more appropriate than others when valuing an imaging center. The federal government has prescribed parameters for all valuations if they lead to transactions in which fair market value is mandated, and it also expects transactions to adhere to more generalized laws relating to entities that provide services to Medicare patients. Radiologists who own, or who are contemplating ownership of, imaging center operations need to understand the principles of valuation, specifically the factors that are involved in a discounted cash flow determination of fair market value.

  14. Online unmixing of multitemporal hyperspectral images accounting for spectral variability

    CERN Document Server

    Thouvenin, Pierre-Antoine; Tourneret, Jean-Yves

    2015-01-01

    Hyperspectral unmixing is aimed at identifying the reference spectral signatures composing an hyperspectral image -- referred to as endmembers -- and their relative abundance fractions in each pixel. In practice, the identified signatures may vary spectrally from an image to another due to varying acquisition conditions inducing possibly significant estimation errors. Against this background, hyperspectral unmixing of several images acquired over the same area is of considerable interest. Indeed, such an analysis enables the endmembers of the scene to be tracked and the corresponding endmember variability to be characterized. Sequential endmember estimation from a set of hyperspectral images is expected to provide improved performance when compared to methods analyzing the images independently. However, the significant size of hyperspectral data precludes the use of batch procedures to jointly estimate the mixture parameters of a sequence of hyperspectral images. Provided that each elementary component is pre...

  15. Feasibility study of on-line digital X-ray imaging for irradiated fuel rods

    Energy Technology Data Exchange (ETDEWEB)

    Parthoens, Y.; Gys, A. [Reactor Material Research Department, SCK-CEN, Mol (Belgium); Smolders, V. [Industrial Engineer Department, Katholieke Hogeschool Kempen, Geel (Belgium)

    2003-07-01

    At the Reactor Material Research Department of the Belgian Nuclear Research Centre SCK-CEN Xray imaging of the internal parts of irradiated fuel rods is done on silver-halide films using a 420 kV X-ray source. The replacement of the films by an on-line digital X-ray imaging system implies several advantages. Images can be evaluated instantly and source parameters can be optimized more easily. Time consuming film development is superfluous. The images can digitally be enhanced, processed, reported and archived. Within this work the feasibility of four commercial on-line digital X-ray imaging systems were studied for post-irradiation examination on fuel rods in a hot cell environment. The criteria to evaluate the systems were image quality, integration in the existing hot cell infrastructure, durability and cost price. For the evaluation and comparison of the image quality a simulation fuel rod was fabricated. Three systems suffered from lack of sensitivity, contrast and/or resolution. Only the CsI-scintillator coupled to a CCD-camera with image intensifier gave a sufficient image quality. On the other hand the image intensifiers' dimensions are difficult to integrate in the existing hot cell infrastructure. Also the durability of intensifier screens is questionable as they are susceptible to image burn. Smaller image intensifiers easier to integrate are commercial available nowadays.

  16. Mining histopathological images via composite hashing and online learning.

    Science.gov (United States)

    Zhang, Xiaofan; Yang, Lin; Liu, Wei; Su, Hai; Zhang, Shaoting

    2014-01-01

    With a continuous growing amount of annotated histopathological images, large-scale and data-driven methods potentially provide the promise of bridging the semantic gap between these images and their diagnoses. The purpose of this paper is to increase the scale at which automated systems can entail scalable analysis of histopathological images in massive databases. Specifically, we propose a principled framework to unify hashing-based image retrieval and supervised learning. Concretely, composite hashing is designed to simultaneously fuse and compress multiple high-dimensional image features into tens of binary hash bits, enabling scalable image retrieval with a very low computational cost. Upon a local data subset that retains the retrieved images, supervised learning methods are applied on-the-fly to model image structures for accurate classification. Our framework is validated thoroughly on 1120 lung microscopic tissue images by differentiating adenocarcinoma and squamous carcinoma. The average accuracy as 87.5% with only 17ms running time, which compares favorably with other commonly used methods.

  17. IMAGE OF A PICTURESQUE PORTRAIT AND LANDSCAPE IN RUSSIAN PROSE: A EKPHRASIS, A MOTIVE AND AN ART DETAIL

    Directory of Open Access Journals (Sweden)

    Лидия Николаевна Дмитриевская

    2014-04-01

    Full Text Available The article demonstrates an attempt to look at the image of a portrait and a landscape in literature from the viewpoint of 3 concepts, which describe this phenomenon: a ekphrasis, a motive and a detail. A sight at the same phenomenon trough 3 different concepts on the one hand reveals various function of a picturesque portrait and landscape, and on the other hand helps to define the sphere of theoretical description at each of these 3 terms. The image of a picturesque portrait and the image of a picturesque landscape in literature seem to be equivalent phenomena. The approach to the research of these phenomena from different positions reveals that both phenomena are described by the term ekphrasis, but a picturesque portrait can be a motive and a detail (when a picturesque work is not described, and simply refers to and a picturesque landscape can not be a motive of a work of art and can seldom be a detail. The most universal definition in modern study of literature is ekphrasis.DOI: http://dx.doi.org/10.12731/2218-7405-2013-9-71

  18. A Corpus of Images and Text in Online News

    NARCIS (Netherlands)

    Hollink, L.; Bedjeti, A.; Harmelen, M. van; Elliott, D.

    2016-01-01

    In recent years, several datasets have been released that include images and text, giving impulse to new methods that combine natural language processing and computer vision. However, there is a need for datasets of images in their natural textual context. The ION corpus contains 300K news article

  19. Evaluation of Image According to Exposure Conditions using Contrast-Detail Phantom for Chest Digital Radiography

    Energy Technology Data Exchange (ETDEWEB)

    Lee, In Ja [Dept. of Radiologic Tecnology, Dongnam Health College, Suwon (Korea, Republic of); Kim, You Hyun; Kim, Chang Nam [Dept. of Radiological Science, College of Health Science, Korea University, Seoul (Korea, Republic of); Kim, Chang Nam; Lee, Chang Yeob; Park, Kye Yeon [Dept. of Diagnostic Radiology, Korea University Guro Hospital, Seoul (Korea, Republic of)

    2009-03-15

    To find out proper photographing conditions in the chest DR imaging, the evaluation of images using the C-D phantom was carried out on relationship of identification capability, graininess, and exposure ratio. The conclusions were obtained as follows. 1. The patient's entrance skin Exposure (ESE) was decreased as tube voltage was increased. 2. According to the tube voltage change, the C-D phantom's identification capability of the exposure conditions was most visible at 110 kVp. 3. The identification capability according to the exposure ratio (mAs) change was most visible at 90 kVp for 0.5 times of low exposure ratio and at 110 kVp for 1.5 times. Therefore, it is known that the images were able to be better identified at a high exposure than a low exposure. 4. The graininess according to the exposure ratio at tube voltage of 110 kVp resulted in the best thing at 1.5 times of ratio when the exposure ratio was 1.5 times increased and the tube voltage was changed, the graininess showed the best result at 110 kVp. Therefore, the patient's exposure dose was low when kVp was increased and the adequate kVp was found to be 110. The image was better identified when exposure ratio was 1.5 times compared to 1.0 times. The graininess was also good when the exposure ratio became 1.5 times. The tube voltage was good at 110 kVp. However, once the exposure ratio is increased, the amount of radiation dose that the patients received get increased, so that the exposure condition has to be thoroughly considered.

  20. A 3D-CTM with detailed online PSC-microphysics: analysis of the Antarctic winter 2003 by comparison with satellite observations

    Directory of Open Access Journals (Sweden)

    F. Daerden

    2007-01-01

    Full Text Available We present the first detailed microphysical simulations which are performed online within the framework of a global 3-D chemical transport model (CTM with full chemistry. The model describes the formation and evolution of four types of polar stratospheric cloud (PSC particles. Aerosol freezing and other relevant microphysical processes are treated in a full explicit way. Each particle type is described by a binned size distribution for the number density and chemical composition. This set-up allows for an accurate treatment of sedimentation and for detailed calculation of surface area densities and optical properties. Simulations are presented for the Antarctic winter of 2003 and comparisons are made to a diverse set of satellite observations (optical and chemical measurements of POAM III and MIPAS to illustrate the capabilities of the model. This study shows that a combined resolution approach where microphysical processes are simulated in coarse-grained conditions gives good results for PSC formation and its large-scale effect on the chemical environment through processes such as denitrification, dehydration and ozone loss.

  1. Spectroscopic imaging technologies for online food safety and sanitation inspection

    Science.gov (United States)

    The Environmental Microbial and Food Safety Laboratory, ARS, USDA is one of the leading groups for the development of optoelectronic sensing technologies and methodologies for food quality, safety, and sanitation inspection. High throughput hyperspectral and multispectral imaging techniques use Ram...

  2. Development of a single-shot-imaging thin film for an online Thomson parabola spectrometer

    Energy Technology Data Exchange (ETDEWEB)

    Sakaki, H.; Fukuda, Y.; Nishiuchi, M.; Hori, T.; Yogo, A.; Jinno, S. [Japan Atomic Energy Agency, 8-1-7 Umemidai, Kizugawa, Kyoto 619-0215 (Japan); Kanasaki, M. [Japan Atomic Energy Agency, 8-1-7 Umemidai, Kizugawa, Kyoto 619-0215 (Japan); Kobe University, 5-1-1, Fukae-minamimachi, Higashinada, Kobe 658-0022 (Japan); Niita, K. [Research Organization for Information Science and Technology, 2-4 Shirakata, Tokai, Ibaraki 319-1106 (Japan)

    2013-01-15

    A single-shot-imaging thin scintillator film was developed for an online Thomson parabola (TP) spectrometer and the first analysis of laser accelerated ions, using the online TP spectrometer, was demonstrated at the JAEA-Kansai Advanced Relativistic Engineering Laser System (J-KAREN). An energy spectrum of {approx}4.0 MeV protons is obtained using only this imaging film without the need of a microchannel plate that is typically utilized in online ion analyses. A general-purpose Monte Carlo particle and heavy ion-transport code system, which consists of various quantum dynamics models, was used for the prediction of the luminescent properties of the scintillator. The simulation can reasonably predict not only the ion trajectories detected by the spectrometer, but also luminescence properties.

  3. Development of a single-shot-imaging thin film for an online Thomson parabola spectrometer.

    Science.gov (United States)

    Sakaki, H; Kanasaki, M; Fukuda, Y; Nishiuchi, M; Hori, T; Yogo, A; Jinno, S; Niita, K

    2013-01-01

    A single-shot-imaging thin scintillator film was developed for an online Thomson parabola (TP) spectrometer and the first analysis of laser accelerated ions, using the online TP spectrometer, was demonstrated at the JAEA-Kansai Advanced Relativistic Engineering Laser System (J-KAREN). An energy spectrum of ~4.0 MeV protons is obtained using only this imaging film without the need of a microchannel plate that is typically utilized in online ion analyses. A general-purpose Monte Carlo particle and heavy ion-transport code system, which consists of various quantum dynamics models, was used for the prediction of the luminescent properties of the scintillator. The simulation can reasonably predict not only the ion trajectories detected by the spectrometer, but also luminescence properties.

  4. Detailed interrogation of trypanosome cell biology via differential organelle staining and automated image analysis

    Directory of Open Access Journals (Sweden)

    Wheeler Richard J

    2012-01-01

    Full Text Available Abstract Background Many trypanosomatid protozoa are important human or animal pathogens. The well defined morphology and precisely choreographed division of trypanosomatid cells makes morphological analysis a powerful tool for analyzing the effect of mutations, chemical insults and changes between lifecycle stages. High-throughput image analysis of micrographs has the potential to accelerate collection of quantitative morphological data. Trypanosomatid cells have two large DNA-containing organelles, the kinetoplast (mitochondrial DNA and nucleus, which provide useful markers for morphometric analysis; however they need to be accurately identified and often lie in close proximity. This presents a technical challenge. Accurate identification and quantitation of the DNA content of these organelles is a central requirement of any automated analysis method. Results We have developed a technique based on double staining of the DNA with a minor groove binding (4'', 6-diamidino-2-phenylindole (DAPI and a base pair intercalating (propidium iodide (PI or SYBR green fluorescent stain and color deconvolution. This allows the identification of kinetoplast and nuclear DNA in the micrograph based on whether the organelle has DNA with a more A-T or G-C rich composition. Following unambiguous identification of the kinetoplasts and nuclei the resulting images are amenable to quantitative automated analysis of kinetoplast and nucleus number and DNA content. On this foundation we have developed a demonstrative analysis tool capable of measuring kinetoplast and nucleus DNA content, size and position and cell body shape, length and width automatically. Conclusions Our approach to DNA staining and automated quantitative analysis of trypanosomatid morphology accelerated analysis of trypanosomatid protozoa. We have validated this approach using Leishmania mexicana, Crithidia fasciculata and wild-type and mutant Trypanosoma brucei. Automated analysis of T. brucei

  5. Spatially detailed retrievals of spring phenology from single-season high-resolution image time series

    Science.gov (United States)

    Vrieling, Anton; Skidmore, Andrew K.; Wang, Tiejun; Meroni, Michele; Ens, Bruno J.; Oosterbeek, Kees; O'Connor, Brian; Darvishzadeh, Roshanak; Heurich, Marco; Shepherd, Anita; Paganini, Marc

    2017-07-01

    Vegetation indices derived from satellite image time series have been extensively used to estimate the timing of phenological events like season onset. Medium spatial resolution (≥250 m) satellite sensors with daily revisit capability are typically employed for this purpose. In recent years, phenology is being retrieved at higher resolution (≤30 m) in response to increasing availability of high-resolution satellite data. To overcome the reduced acquisition frequency of such data, previous attempts involved fusion between high- and medium-resolution data, or combinations of multi-year acquisitions in a single phenological reconstruction. The objectives of this study are to demonstrate that phenological parameters can now be retrieved from single-season high-resolution time series, and to compare these retrievals against those derived from multi-year high-resolution and single-season medium-resolution satellite data. The study focuses on the island of Schiermonnikoog, the Netherlands, which comprises a highly-dynamic saltmarsh, dune vegetation, and agricultural land. Combining NDVI series derived from atmospherically-corrected images from RapidEye (5 m-resolution) and the SPOT5 Take5 experiment (10m-resolution) acquired between March and August 2015, phenological parameters were estimated using a function fitting approach. We then compared results with phenology retrieved from four years of 30 m Landsat 8 OLI data, and single-year 100 m Proba-V and 250 m MODIS temporal composites of the same period. Retrieved phenological parameters from combined RapidEye/SPOT5 displayed spatially consistent results and a large spatial variability, providing complementary information to existing vegetation community maps. Retrievals that combined four years of Landsat observations into a single synthetic year were affected by the inclusion of years with warmer spring temperatures, whereas adjustment of the average phenology to 2015 observations was only feasible for a few pixels

  6. The Role of Sexual Images in Online and Offline Sexual Behaviour With Minors.

    Science.gov (United States)

    Quayle, Ethel; Newman, Emily

    2015-06-01

    Sexual images have long been associated with sexual interest and behaviour with minors. The Internet has impacted access to existing content and the ability to create content which can be uploaded and distributed. These images can be used forensically to determine the legality of the behaviour, but importantly for psychiatry, they offer insight into motivation, sexual interest and deviance, the relationship between image content and offline sexual behaviour, and how they might be used in online solicitation and grooming with children and adolescents. Practitioners will need to consider the function that these images may serve, the motivation for their use and the challenges of assessment. This article provides an overview of the literature on the use of illegal images and the parallels with existing paraphilias, such as exhibitionism and voyeurism. The focus is on recent research on the Internet and sexual images of children, including the role that self-taken images by youth may play in the offending process.

  7. Adaptive online learning based tissue segmentation of MR brain images

    NARCIS (Netherlands)

    Damkat, C.

    2007-01-01

    The aging population in the European Union and the US has increased the importance of research in neurodegenerative diseases. Imaging plays an essential role in this endeavor by providing insight to the intricate cellular and inter-cellular processes in living tissues that will otherwise be difficul

  8. Detailed Tremor Migration Styles in Guerrero, Mexico Imaged with Cross-station Cross-correlations

    Science.gov (United States)

    Peng, Y.; Rubin, A. M.

    2015-12-01

    Tremor occurred downdip of the area that slipped the most during the 2006 slow slip event (SSE) in Guerrero, Mexico, as opposed to Cascadia, where tremor locations and rupture zones of SSEs largely overlap. Here we obtain high resolution tremor locations by applying cross-station cross-correlations [Armbruster et al., 2014] to seismic data from the Meso-America Subduction Experiment deployment. A few 3-station detectors are adopted to capture detailed deformation styles in the tremor "transient zone" and the downdip "sweet spot" as defined in Frank et al., 2014. Similar to Cascadia, tremor activities in our study region were comprised mostly of short tremor bursts lasting minutes to hours. Many of these bursts show clear migration patterns with propagation velocities of hundreds of km/day, comparable to those in Cascadia. However, the propagation of the main tremor front was often not in a simple unilateral fashion. Before the 2006 SSE, we observe 4 large tremor episodes during which both the transient zone and the sweet spot participated, consistent with previous findings [Frank et al., 2014]. The transient zone usually became active a few days after the sweet spot. We find many along-dip migrations with recurrence intervals of about a half day within a region about 10 km along strike and 35 km along dip in the sweet spot, suggesting possible tidal modulation, after the main front moved beyond this region. These migrations appear not to originate at the main front, in contrast to tremor migrations from a few km to tens of km across observed in Cascadia [Rubin and Armbruster, 2013; Peng et al., 2015; Peng and Rubin, submitted], but possibly similar to Shikoku, Japan [Shelly et al., 2007]. We do not observe obvious half-day periodicity for the migrations farther downdip within the sweet spot. During the SSE, the recurrence interval of tremor episodes decreased significantly in both the transient zone and the sweet spot, with that of the former being much shorter

  9. Current practice vs. guideline based imaging in abdominal radiology in the German speaking area. Results of an online survey; Versorgungsrealitaet vs. leitliniengerechte Bildgebung in der Abdominalradiologie im deutschsprachigen Raum. Ergebnisse einer Online-Umfrage

    Energy Technology Data Exchange (ETDEWEB)

    Schreyer, A.G. [University Hospital Regenburg (Germany). Dept. of Radiology; Wessling, J. [Clemens Hospital Muenchen (Germany). Dept. of Radiology; Grenacher, L. [Diagnostic Muenchen (Germany). Diagnostic Imaging Center

    2016-03-15

    The working group for abdominal imaging within the German Roentgen Society (DRG) performed an online survey amongst radiologist concerning the current status of techniques for abdominal imaging. The results of this survey were compared with the most recent guidelines. We performed an online survey open for all members of the DRG during a 76-day period with 65 questions and an overall estimated time for finishing the questionnaire of 15 minutes concerning technical specifications for abdominal radiological imaging. The results were evaluated using descriptive statistics. 90 of all participants, who filled out the survey covering more than 80 % of the questions, were included in the statistical evaluation. 27 % of all participants were registered radiologists while 73 % represented radiologists working in a hospital. Most participants worked in a managerial position. The participants gave detailed information regarding the radiological techniques used in dedicated organ systems (esophagus, stomach, pancreas, liver, small intestines, colon) regarding acquired contrast phases and oral and intravenous administration of contrast medium. The results confirm that most radiologists participating in this survey perform their examinations and choose their modalities in conformity with the current existing clinical guidelines. Because most clinical guidelines do not specify radiological examinations in detail, there is a noteworthy heterogeneity of the acquired contrast phases and major divergence in terms of technical parameters. Therefore a joint radiological effort should be initiated for developing and publishing updated radiological parameters for abdominal imaging.

  10. Online Detection Approach for Rectangle Ceramic Tile Based on Sequenced Scenery Image

    Directory of Open Access Journals (Sweden)

    Yang Lei

    2013-06-01

    Full Text Available Image based ceramic tile detection is a way to labor liberation in the production process of ceramic tile. Shapes of ceramic tiles studied in this study are rectangle with different sizes. Many existed researches are based on a situation that only a piece of tile goes through special rail one time, resulting in one or less piece of tile hold in the image from CCD sensor. But in fact, multiple tiles with the same sizes run in a row simultaneously at most factories’ rails, and a 'scenery' image is obtained from CCD sensor. And the image processing method based on close-up images is not satisfied in such cases. To detect different rectangle ceramic tiles online according to a sequence of scenery images, this study provide a vector corner method to decide the rectangle tiles with known size information, and a valley detection method via key-image-frames strategy to distinguish the first row in images. Finally, our Online Approach for Rectangle Tile Detection (OARTD was embedded into a detection system and applied to a factory; testing results validated its good performance. Indeed, the use of such an automatic system, to control a tile plant for shape classifying has a good prospect.

  11. Imaging spectrometer trade studies: a detailed comparison of the Offner-Chrisp and reflective triplet optical design forms

    Science.gov (United States)

    Cook, Lacy G.; Silny, John F.

    2010-08-01

    High quality imaging spectroscopy data is useful for both military and civilian applications. Current state-of-the-art imaging spectrometers typically rely on the Offner-Chrisp (OC) optical form. Making use of a spherically concentric, axially symmetric, and telecentric design, the OC imaging spectrometer provides excellent spectral-spatial uniformity but with many regrets: (1) no real-entrance pupil, (2) relatively slow optical speeds, (3) required convex diffraction grating, (4) narrow field-of-view, and (5) limited scalability. Recently, the Raytheon patented Reflective Triplet (RT) optical design form has produced extremely large format imaging spectrometers of exceptional quality. The RT optical design provides spectral-spatial uniformity comparable to the OC form, but with a number of advantages: (1) extremely large fields-of-view, (2) faster optical speeds, (3) a real-entrance pupil for optimal cold shielding and calibration, (4) use of either a prism or flat diffraction grating operating in collimated space (with an option for both simultaneously in a 2- channel device), and (5) extremely wide spectral range using common reflective optics and multiple focal plane arrays, dispersive elements, and entrance slits. This paper presents a number of detailed designs exemplifying the differences between the OC and RT forms.

  12. Enhancing online timeline visualizations with events and images

    Science.gov (United States)

    Pandya, Abhishek; Mulye, Aniket; Teoh, Soon Tee

    2011-01-01

    The use of timeline to visualize time-series data is one of the most intuitive and commonly used methods, and is used for widely-used applications such as stock market data visualization, and tracking of poll data of election candidates over time. While useful, these timeline visualizations are lacking in contextual information of events which are related or cause changes in the data. We have developed a system that enhances timeline visualization with display of relevant news events and their corresponding images, so that users can not only see the changes in the data, but also understand the reasons behind the changes. We have also conducted a user study to test the effectiveness of our ideas.

  13. A new automated assessment method for contrast-detail images by applying support vector machine and its robustness to nonlinear image processing.

    Science.gov (United States)

    Takei, Takaaki; Ikeda, Mitsuru; Imai, Kuniharu; Yamauchi-Kawaura, Chiyo; Kato, Katsuhiko; Isoda, Haruo

    2013-09-01

    The automated contrast-detail (C-D) analysis methods developed so-far cannot be expected to work well on images processed with nonlinear methods, such as noise reduction methods. Therefore, we have devised a new automated C-D analysis method by applying support vector machine (SVM), and tested for its robustness to nonlinear image processing. We acquired the CDRAD (a commercially available C-D test object) images at a tube voltage of 120 kV and a milliampere-second product (mAs) of 0.5-5.0. A partial diffusion equation based technique was used as noise reduction method. Three radiologists and three university students participated in the observer performance study. The training data for our SVM method was the classification data scored by the one radiologist for the CDRAD images acquired at 1.6 and 3.2 mAs and their noise-reduced images. We also compared the performance of our SVM method with the CDRAD Analyser algorithm. The mean C-D diagrams (that is a plot of the mean of the smallest visible hole diameter vs. hole depth) obtained from our devised SVM method agreed well with the ones averaged across the six human observers for both original and noise-reduced CDRAD images, whereas the mean C-D diagrams from the CDRAD Analyser algorithm disagreed with the ones from the human observers for both original and noise-reduced CDRAD images. In conclusion, our proposed SVM method for C-D analysis will work well for the images processed with the non-linear noise reduction method as well as for the original radiographic images.

  14. Combining Seismic Arrays to Image Detailed Rupture Properties of Large Earthquakes: Evidence for Frequent Triggering of Multiple Faults

    Science.gov (United States)

    Ishii, M.; Kiser, E.

    2010-12-01

    Imaging detailed rupture characteristics using the back-projection method, which time-reverses waveforms to their source, has become feasible in recent years due to the availability of data from large aperture arrays with dense station coverage. In contrast to conventional techniques, this method can quickly and indiscriminately provide the spatio-temporal details of rupture propagation. Though many studies have utilized the back-projection method with a single regional array, the limited azimuthal coverage often leads to skewed resolution. In this study, we enhance the imaging power by combining data from two arrays, i.e., the Transportable Array (TA) in the United States and the High Sensitivity Seismographic Network (Hi-net) in Japan. This approach suppresses artifacts and achieves good lateral resolution by improving distance and azimuthal coverage while maintaining waveform coherence. We investigate four large events using this method: the August 15, 2007 Pisco, Peru earthquake, the September 12, 2007 Southern Sumatra earthquake, the September 29, 2009 Samoa Islands earthquake, and the February 27, 2010 Maule, Chile earthquake. In every case, except the Samoa Islands event, the distance of one of the arrays from the epicenter requires us to use the direct P wave and core phases in the back-projection. One of the common features of the rupture characteristics obtained from the back-projection analysis is spatio-temporal rupture discontinuities, or discrete subevents. Both the size of the gaps and the timing between subevents suggest that multiple segments are involved during giant earthquakes, and that they trigger slip on other faults. For example, the 2009 Samoa Islands event began with a rupture propagating north for about 15 seconds followed by a much larger rupture that originated 30 km northwest of the terminus of the first event and propagated back toward the southeast. The involvement of multiple rupture segments with different slip characteristics

  15. A detailed study on the use of polynomial functions for modeling geometric distortion in magnetic resonance imaging.

    Science.gov (United States)

    Wang, Deming; Yang, Zhengyi

    2008-03-01

    The use of polynomial functions for modeling geometric distortion in magnetic resonance imaging (MRI) that arises from scanner's hardware imperfection is studied in detail. In this work, the geometric distortion data from four representative MRI systems were used. Modeling of these data using polynomial functions of the fourth, fifth, sixth, and seventh orders was carried out. In order to investigate how this modeling performed for different size and shape of the volume of interest, the modeling was carried out for three different volumes of interest (VOI): a cube, a cylinder, and a sphere. The modeling's goodness was assessed using both the maximum and mean absolute errors. The modeling results showed that (i) for the cube VOI there appears to be an optimal polynomial function that gives the least modeling errors and the sixth order polynomial was found to be the optimal polynomial function for the size of the cubic VOI considered in the present work; (ii) for the cylinder VOI, all four polynomials performed approximately equally well but a trend of a slight decrease in the mean absolute error with the increasing order of the polynomial was noted; and (iii) for the sphere VOI, the maximum absolute error showed some variations with the order of the polynomial, with the fourth order polynomial producing the smallest maximum absolute errors. It is further noted that extrapolation could lead to very large errors so any extrapolation needs to be avoided. A detailed analysis on the modeling errors is presented.

  16. Online updating of context-aware landmark detectors for prostate localization in daily treatment CT images

    Energy Technology Data Exchange (ETDEWEB)

    Dai, Xiubin [College of Geographic and Biologic Information, Nanjing University of Posts and Telecommunications, Nanjing, Jiangsu 210015, China and IDEA Lab, Department of Radiology and BRIC, University of North Carolina at Chapel Hill, 130 Mason Farm Road, Chapel Hill, North Carolina 27510 (United States); Gao, Yaozong [IDEA Lab, Department of Radiology and BRIC, University of North Carolina at Chapel Hill, 130 Mason Farm Road, Chapel Hill, North Carolina 27510 (United States); Shen, Dinggang, E-mail: dgshen@med.unc.edu [IDEA Lab, Department of Radiology and BRIC, University of North Carolina at Chapel Hill, 130 Mason Farm Road, Chapel Hill, North Carolina 27510 and Department of Brain and Cognitive Engineering, Korea University, Seoul (Korea, Republic of)

    2015-05-15

    Purpose: In image guided radiation therapy, it is crucial to fast and accurately localize the prostate in the daily treatment images. To this end, the authors propose an online update scheme for landmark-guided prostate segmentation, which can fully exploit valuable patient-specific information contained in the previous treatment images and can achieve improved performance in landmark detection and prostate segmentation. Methods: To localize the prostate in the daily treatment images, the authors first automatically detect six anatomical landmarks on the prostate boundary by adopting a context-aware landmark detection method. Specifically, in this method, a two-layer regression forest is trained as a detector for each target landmark. Once all the newly detected landmarks from new treatment images are reviewed or adjusted (if necessary) by clinicians, they are further included into the training pool as new patient-specific information to update all the two-layer regression forests for the next treatment day. As more and more treatment images of the current patient are acquired, the two-layer regression forests can be continually updated by incorporating the patient-specific information into the training procedure. After all target landmarks are detected, a multiatlas random sample consensus (multiatlas RANSAC) method is used to segment the entire prostate by fusing multiple previously segmented prostates of the current patient after they are aligned to the current treatment image. Subsequently, the segmented prostate of the current treatment image is again reviewed (or even adjusted if needed) by clinicians before including it as a new shape example into the prostate shape dataset for helping localize the entire prostate in the next treatment image. Results: The experimental results on 330 images of 24 patients show the effectiveness of the authors’ proposed online update scheme in improving the accuracies of both landmark detection and prostate segmentation

  17. LINGUISTIC FEATURES OF NATO’S MEDIA IMAGE (THE CASE STUDY OF BRITISH ONLINE PUBLICATIONS

    Directory of Open Access Journals (Sweden)

    Valuyskaya Olga Ruslanovna

    2014-12-01

    Full Text Available The paper investigates linguistic specific means of NATO's image making in online British leading newspapers. The case study involves news reports and analytical articles that represent explicit and implicit evaluation of the North Atlantic Treaty Organization. The investigation is based on the principles of the media linguistic approach and suggests the structural peculiarities of a media image that can be analyzed as a three-sided unit including positive, negative and neutral structural elements of image introduction into a media text. The NATO's image can be viewed as that of a geopolitical actor, creating its Natoland. Certain media topics are analyzed as creating positive and negative images of the NATO as a military organization. A finite list of positive and negative constituents to the Alliance's image is presented in the paper. It is assumed that the simplistic writer-reader model of interaction shapes certain elements of a media image that can be interpreted by a reader. The author distinguishes in the paper the principle constituents of an international organization in general, and the NATO in particular. Findings of the study demonstrate that the NATO's media image is interpreted by the readers as the conceptual entity of two key images: a peacemaker and a hawk that are restored on lexical and intertextual levels.

  18. An online detection system for aggregate sizes and shapes based on digital image processing

    Science.gov (United States)

    Yang, Jianhong; Chen, Sijia

    2016-07-01

    Traditional aggregate size measuring methods are time-consuming, taxing, and do not deliver online measurements. A new online detection system for determining aggregate size and shape based on a digital camera with a charge-coupled device, and subsequent digital image processing, have been developed to overcome these problems. The system captures images of aggregates while falling and flat lying. Using these data, the particle size and shape distribution can be obtained in real time. Here, we calibrate this method using standard globules. Our experiments show that the maximum particle size distribution error was only 3 wt%, while the maximum particle shape distribution error was only 2 wt% for data derived from falling aggregates, having good dispersion. In contrast, the data for flat-lying aggregates had a maximum particle size distribution error of 12 wt%, and a maximum particle shape distribution error of 10 wt%; their accuracy was clearly lower than for falling aggregates. However, they performed well for single-graded aggregates, and did not require a dispersion device. Our system is low-cost and easy to install. It can successfully achieve online detection of aggregate size and shape with good reliability, and it has great potential for aggregate quality assurance.

  19. Psychophysical evaluation of the image quality of a dynamic flat-panel digital x-ray image detector using the threshold contrast detail detectability (TCDD) technique

    Science.gov (United States)

    Davies, Andrew G.; Cowen, Arnold R.; Bruijns, Tom J. C.

    1999-05-01

    We are currently in an era of active development of the digital X-ray imaging detectors that will serve the radiological communities in the new millennium. The rigorous comparative physical evaluations of such devices are therefore becoming increasingly important from both the technical and clinical perspectives. The authors have been actively involved in the evaluation of a clinical demonstration version of a flat-panel dynamic digital X-ray image detector (or FDXD). Results of objective physical evaluation of this device have been presented elsewhere at this conference. The imaging performance of FDXD under radiographic exposure conditions have been previously reported, and in this paper a psychophysical evaluation of the FDXD detector operating under continuous fluoroscopic conditions is presented. The evaluation technique employed was the threshold contrast detail detectability (TCDD) technique, which enables image quality to be measured on devices operating in the clinical environment. This approach addresses image quality in the context of both the image acquisition and display processes, and uses human observers to measure performance. The Leeds test objects TO[10] and TO[10+] were used to obtain comparative measurements of performance on the FDXD and two digital spot fluorography (DSF) systems, one utilizing a Plumbicon camera and the other a state of the art CCD camera. Measurements were taken at a range of detector entrance exposure rates, namely 6, 12, 25 and 50 (mu) R/s. In order to facilitate comparisons between the systems, all fluoroscopic image processing such as noise reduction algorithms, were disabled during the experiments. At the highest dose rate FDXD significantly outperformed the DSF comparison systems in the TCDD comparisons. At 25 and 12 (mu) R/s all three-systems performed in an equivalent manner and at the lowest exposure rate FDXD was inferior to the two DSF systems. At standard fluoroscopic exposures, FDXD performed in an equivalent

  20. Detecting the Online Image of “Average” Restaurants on TripAdvisor

    Directory of Open Access Journals (Sweden)

    Hrvoje Jakopović

    2016-06-01

    Full Text Available Collective intelligence can be interpreted as the actions of individuals that provide collective effects. In online spaces, the more user comments about a matter of discussion, the higher the potential that certain repeated points of view will be used as a story frame. This observation can be a very useful explanation for the value of user comments, reviews and the ratings in the field of public relations. Nowadays, it has become noticeable that many indecisive people who are thinking of buying a product or using a certain service rely on information left by users who already have some kind of experience with the product or service. This information has an effect on decision-making and taking action. In the case of contemporary PR, collective intelligence, facilitated through user comments/reviews, is involved in the image making process. This paper uses the idea of collective intelligence to measure restaurants’ online image, using sentiment analysis to gain insight to users’ attitudes and opinions. Image is interpreted as a short-term outcome of organizational activities that can be identified through individual attitudes and opinions in this study. The author uses sentiment analysis, the use of natural language processing applications, to examine user comments and reviews for restaurants in Dubrovnik rated as “average” on the website TripAdvisor. This paper tests the accuracy of sentiment analysis software, therefore the efficiency of automated sentiment analysis is compared to human sentiment analysis. The results indicate that sentiment analysis tools could be important instruments for the estimation of a positive, negative, or neutral sentiment and detection of organization’s online image.

  1. In-beam PET imaging for on-line adaptive proton therapy: an initial phantom study

    Science.gov (United States)

    Shao, Yiping; Sun, Xishan; Lou, Kai; Zhu, Xiaorong R.; Mirkovic, Dragon; Poenisch, Falk; Grosshans, David

    2014-07-01

    We developed and investigated a positron emission tomography (PET) system for use with on-line (both in-beam and intra-fraction) image-guided adaptive proton therapy applications. The PET has dual rotating depth-of-interaction measurable detector panels by using solid-state photomultiplier (SSPM) arrays and LYSO scintillators. It has a 44 mm diameter trans-axial and 30 mm axial field-of-view (FOV). A 38 mm diameter polymethyl methacrylate phantom was placed inside the FOV. Both PET and phantom axes were aligned with a collimated 179.2 MeV beam. Each beam delivered ˜50 spills (0.5 s spill and 1.5 s inter-spill time, 3.8 Gy at Bragg peak). Data from each beam were acquired with detectors at a given angle. Nine datasets for nine beams with detectors at nine different angles over 180° were acquired for full-tomographic imaging. Each dataset included data both during and 5 min after irradiations. The positron activity-range was measured from the PET image reconstructed from all nine datasets and compared to the results from simulated images. A 22Na disc-source was also imaged after each beam to monitor the PET system's performance. PET performed well except for slight shifts of energy photo-peak positions (PET with high sensitivity and uniform resolution. Sub-mm activity-ranges were achieved with minimal 6 s acquisition time and three spill irradiations. These results indicate the feasibility of PET for intra-fraction beam-range verification. Further studies are needed to develop and apply a novel clinical PET system for on-line image-guided adaptive proton therapy.

  2. A hybrid strategy of offline adaptive planning and online image guidance for prostate cancer radiotherapy

    Science.gov (United States)

    Lei, Yu; Wu, Qiuwen

    2010-04-01

    Offline adaptive radiotherapy (ART) has been used to effectively correct and compensate for prostate motion and reduce the required margin. The efficacy depends on the characteristics of the patient setup error and interfraction motion through the whole treatment; specifically, systematic errors are corrected and random errors are compensated for through the margins. In online image-guided radiation therapy (IGRT) of prostate cancer, the translational setup error and inter-fractional prostate motion are corrected through pre-treatment imaging and couch correction at each fraction. However, the rotation and deformation of the target are not corrected and only accounted for with margins in treatment planning. The purpose of this study was to investigate whether the offline ART strategy is necessary for an online IGRT protocol and to evaluate the benefit of the hybrid strategy. First, to investigate the rationale of the hybrid strategy, 592 cone-beam-computed tomography (CBCT) images taken before and after each fraction for an online IGRT protocol from 16 patients were analyzed. Specifically, the characteristics of prostate rotation were analyzed. It was found that there exist systematic inter-fractional prostate rotations, and they are patient specific. These rotations, if not corrected, are persistent through the treatment fraction, and rotations detected in early fractions are representative of those in later fractions. These findings suggest that the offline adaptive replanning strategy is beneficial to the online IGRT protocol with further margin reductions. Second, to quantitatively evaluate the benefit of the hybrid strategy, 412 repeated helical CT scans from 25 patients during the course of treatment were included in the replanning study. Both low-risk patients (LRP, clinical target volume, CTV = prostate) and intermediate-risk patients (IRP, CTV = prostate + seminal vesicles) were included in the simulation. The contours of prostate and seminal vesicles were

  3. A hybrid strategy of offline adaptive planning and online image guidance for prostate cancer radiotherapy

    Energy Technology Data Exchange (ETDEWEB)

    Lei Yu [Department of Radiation Oncology, Wayne State University, 4100 John R, Detroit, MI 48201 (United States); Wu Qiuwen [Department of Radiation Oncology, William Beaumont Hospital, 3601 West 13 Mile Rd, Royal Oak, MI 48073 (United States)], E-mail: Qiuwen.Wu@Duke.edu

    2010-04-21

    Offline adaptive radiotherapy (ART) has been used to effectively correct and compensate for prostate motion and reduce the required margin. The efficacy depends on the characteristics of the patient setup error and interfraction motion through the whole treatment; specifically, systematic errors are corrected and random errors are compensated for through the margins. In online image-guided radiation therapy (IGRT) of prostate cancer, the translational setup error and inter-fractional prostate motion are corrected through pre-treatment imaging and couch correction at each fraction. However, the rotation and deformation of the target are not corrected and only accounted for with margins in treatment planning. The purpose of this study was to investigate whether the offline ART strategy is necessary for an online IGRT protocol and to evaluate the benefit of the hybrid strategy. First, to investigate the rationale of the hybrid strategy, 592 cone-beam-computed tomography (CBCT) images taken before and after each fraction for an online IGRT protocol from 16 patients were analyzed. Specifically, the characteristics of prostate rotation were analyzed. It was found that there exist systematic inter-fractional prostate rotations, and they are patient specific. These rotations, if not corrected, are persistent through the treatment fraction, and rotations detected in early fractions are representative of those in later fractions. These findings suggest that the offline adaptive replanning strategy is beneficial to the online IGRT protocol with further margin reductions. Second, to quantitatively evaluate the benefit of the hybrid strategy, 412 repeated helical CT scans from 25 patients during the course of treatment were included in the replanning study. Both low-risk patients (LRP, clinical target volume, CTV = prostate) and intermediate-risk patients (IRP, CTV = prostate + seminal vesicles) were included in the simulation. The contours of prostate and seminal vesicles were

  4. An on-line image data base system: Managing image collections

    Science.gov (United States)

    Malchus B. Baker; Daniel P. Huebner; Peter F. Ffolliott

    2000-01-01

    Many researchers and land management personnel want photographic records of the phases of their studies or projects. Depending on the personnel and the type of project, a study can result in a few or hundreds of photographic images. A data base system allows users to query using various parameters, such as key words, dates, and project locations, and to view images...

  5. An integrated on-line irradiation and in situ live cell imaging system

    Science.gov (United States)

    Liang, Ying; Fu, Qibin; Wang, Weikang; Liu, Yu; Liu, Feng; Yang, Gen; Wang, Yugang

    2015-09-01

    Ionizing radiation poses a threat to genome integrity by introducing DNA damages, particularly DNA double-strand breaks (DSB) in cells. Understanding how cells react to DSB and maintain genome integrity is of major importance, since increasing evidences indicate the links of DSB with genome instability and cancer predispositions. However, tracking the dynamics of DNA damages and repair response to ionizing radiation in individual cell is difficult. Here we describe the development of an on-line irradiation and in situ live cell imaging system based on isotopic sources at Institute of Heavy Ion Physics, Peking University. The system was designed to irradiate cells and in situ observe the cellular responses to ionizing radiation in real time. On-line irradiation was achieved by mounting a metal framework that hold an isotopic γ source above the cell culture dish for γ irradiation; or by integrating an isotopic α source to an objective lens under the specialized cell culture dish for α irradiation. Live cell imaging was performed on a confocal microscope with an environmental chamber installed on the microscope stage. Culture conditions in the environment chamber such as CO2, O2 concentration as well as temperature are adjustable, which further extends the capacity of the system and allows more flexible experimental design. We demonstrate the use of this system by tracking the DSB foci formation and disappearance in individual cells after exposure to irradiation. On-line irradiation together with in situ live cell imaging in adjustable culture conditions, the system overall provides a powerful tool for investigation of cellular and subcellular response to ionizing radiation under different physiological conditions such as hyperthermia or hypoxia.

  6. An integrated on-line irradiation and in situ live cell imaging system

    Energy Technology Data Exchange (ETDEWEB)

    Liang, Ying; Fu, Qibin; Wang, Weikang; Liu, Yu; Liu, Feng; Yang, Gen, E-mail: gen.yang@pku.edu.cn; Wang, Yugang

    2015-09-01

    Ionizing radiation poses a threat to genome integrity by introducing DNA damages, particularly DNA double-strand breaks (DSB) in cells. Understanding how cells react to DSB and maintain genome integrity is of major importance, since increasing evidences indicate the links of DSB with genome instability and cancer predispositions. However, tracking the dynamics of DNA damages and repair response to ionizing radiation in individual cell is difficult. Here we describe the development of an on-line irradiation and in situ live cell imaging system based on isotopic sources at Institute of Heavy Ion Physics, Peking University. The system was designed to irradiate cells and in situ observe the cellular responses to ionizing radiation in real time. On-line irradiation was achieved by mounting a metal framework that hold an isotopic γ source above the cell culture dish for γ irradiation; or by integrating an isotopic α source to an objective lens under the specialized cell culture dish for α irradiation. Live cell imaging was performed on a confocal microscope with an environmental chamber installed on the microscope stage. Culture conditions in the environment chamber such as CO{sub 2}, O{sub 2} concentration as well as temperature are adjustable, which further extends the capacity of the system and allows more flexible experimental design. We demonstrate the use of this system by tracking the DSB foci formation and disappearance in individual cells after exposure to irradiation. On-line irradiation together with in situ live cell imaging in adjustable culture conditions, the system overall provides a powerful tool for investigation of cellular and subcellular response to ionizing radiation under different physiological conditions such as hyperthermia or hypoxia.

  7. Expeditions through image jungles The commercial use of image libraries in an online environment

    OpenAIRE

    Goeker, A.; Butterworth, R.; Macfarlane, A; Ahmed, T. S.; Stumpf, S.

    2016-01-01

    Purpose: Searching for appropriate images as part of a work task is a non-trivial problem. Journalists and copywriters need to find images that are not only visually appropriate to accompany the documents they are creating, but are acceptably priced and licensed.\\ud \\ud Methodology: A work based study methodology and grounded theory are used to collect qualitative data from a variety of creative professionals including journalists.\\ud \\ud Findings: We report the findings of a study to investi...

  8. A before and after study of the impact of academic detailing on the use of diagnostic imaging for shoulder complaints in general practice

    OpenAIRE

    Gialamas Angela; Martin David K; Yelland Lisa; Rowett Debra; Barton Christopher A; Broadhurst Norm A; Beilby Justin J

    2007-01-01

    Abstract Background The aim of this study was to assess the impact that Academic Detailing (AD) had on General Practitioners' use of diagnostic imaging for shoulder complaints in general practice and their knowledge and confidence to manage shoulder pain. Methods One-to-one Academic Detailing (AD) for management of shoulder pain was delivered to 87 General Practitioners (GPs) in metropolitan Adelaide, South Australia, together with locally developed clinical guidelines and a video/DVD on how ...

  9. Temporal bone anomalies in the branchio-oto-renal syndrome: detailed computed tomographic and magnetic resonance imaging findings.

    NARCIS (Netherlands)

    Ceruti, S.; Stinckens, C.I.C.; Cremers, C.W.R.J.; Casselman, J.W.

    2002-01-01

    OBJECTIVE: To inventory computed tomographic and magnetic resonance imaging findings in the branchio-oto-renal (BOR) syndrome. STUDY DESIGN: A prospective computed tomographic and magnetic resonance imaging study on a family with the BOR syndrome. SETTING: Department of medical imaging and magnetic

  10. Temporal bone anomalies in the branchio-oto-renal syndrome: detailed computed tomographic and magnetic resonance imaging findings.

    NARCIS (Netherlands)

    Ceruti, S.; Stinckens, C.I.C.; Cremers, C.W.R.J.; Casselman, J.W.

    2002-01-01

    OBJECTIVE: To inventory computed tomographic and magnetic resonance imaging findings in the branchio-oto-renal (BOR) syndrome. STUDY DESIGN: A prospective computed tomographic and magnetic resonance imaging study on a family with the BOR syndrome. SETTING: Department of medical imaging and magnetic

  11. OLIVER: an online library of images for veterinary education and research.

    Science.gov (United States)

    McGreevy, Paul; Shaw, Tim; Burn, Daniel; Miller, Nick

    2007-01-01

    As part of a strategic move by the University of Sydney toward increased flexibility in learning, the Faculty of Veterinary Science undertook a number of developments involving Web-based teaching and assessment. OLIVER underpins them by providing a rich, durable repository for learning objects. To integrate Web-based learning, case studies, and didactic presentations for veterinary and animal science students, we established an online library of images and other learning objects for use by academics in the Faculties of Veterinary Science and Agriculture. The objectives of OLIVER were to maximize the use of the faculty's teaching resources by providing a stable archiving facility for graphic images and other multimedia learning objects that allows flexible and precise searching, integrating indexing standards, thesauri, pull-down lists of preferred terms, and linking of objects within cases. OLIVER offers a portable and expandable Web-based shell that facilitates ongoing storage of learning objects in a range of media. Learning objects can be downloaded in common, standardized formats so that they can be easily imported for use in a range of applications, including Microsoft PowerPoint, WebCT, and Microsoft Word. OLIVER now contains more than 9,000 images relating to many facets of veterinary science; these are annotated and supported by search engines that allow rapid access to both images and relevant information. The Web site is easily updated and adapted as required.

  12. The detailed assessment of left and right ventricular functions by tissue Doppler imaging in patients with familial Mediterranean fever.

    Science.gov (United States)

    Tavil, Yusuf; Ureten, Kemal; Oztürk, Mehmet Akif; Sen, Nihat; Kaya, Mehmet Güngör; Cemri, Mustafa; Cengel, Atiye

    2008-02-01

    In the contrary to other rheumatologic disorders, there have been limited numbers of studies investigating the cardiac involvement in patients with familial Mediterranean fever (FMF), although the disease may carry a potential for cardiovascular disorders because of sustained inflammation during its course. In the present study, we used high usefulness tissue Doppler echocardiography for detailed analysis of cardiac changes in FMF patients. The study population included 30 patients with FMF (11 men, 19 women; mean age, 35 +/- 7 years, mean disease duration, 15.4 +/- 7.6 years) and 30 healthy subjects as controls (12 men, 18 women; mean age, 33 +/- 7 years). The diagnosis of FMF was established according to the Tell-Hashomer criteria. Left and right ventricular functions were measured using echocardiography comprising standard two-dimensional, M-mode, and conventional Doppler as well as tissue Doppler imaging. The conventional echocardiographic paratemeters were similar apart from left ventricular relaxation time was longer (107 +/- 25 vs 85 +/- 10 ms, p < 0.001, respectively) in patients with FMF. According to the tissue Doppler measurements, while systolic velocities of both ventricles were not different, diastolic filling velocities of left ventricle including E'(m) (12.6 +/- 3.4 vs 14.7 +/- 3.3 cm/s, p = 0.04), A'(m) (10.1 +/- 2.6 vs 8.6 +/- 2.0 cm/s, p = 0.015), and E'(m)/ A'(m) (1.24 +/- 0.4 vs 1.71 +/- 0.5 cm/s, p = 0.012) values were statistically different between the groups. Left ventricular myocardial performance indices and right ventricular diastolic functions were found similar between two groups. In addition, there were no significant correlations between the disease duration, clinical features, and echocardiographic parameters. In conclusion, we have demonstrated that although systolic functions were comparable in the patients and controls, left ventricular diastolic function indices were impaired in FMF patients by using tissue Doppler analysis.

  13. Investigating the Relationship of Sociodemographic and Personality Factors to Faculty Perceptions and Motivations Regarding the Use of Online Instruction in Radiologic and Imaging Sciences

    Science.gov (United States)

    Washington, Angela E.

    2012-01-01

    The purpose of this quantitative correlational study was to investigate the relationship of sociodemographic and personality traits to faculty perceptions and motivations regarding the use of online instruction in radiologic and imaging sciences. A faculty perception and motivations survey of online instruction was administered online in order to…

  14. Light scattering and transmission measurement using digital imaging for online analysis of constituents in milk

    Science.gov (United States)

    Jain, Pranay; Sarma, Sanjay E.

    2015-05-01

    Milk is an emulsion of fat globules and casein micelles dispersed in an aqueous medium with dissolved lactose, whey proteins and minerals. Quantification of constituents in milk is important in various stages of the dairy supply chain for proper process control and quality assurance. In field-level applications, spectrophotometric analysis is an economical option due to the low-cost of silicon photodetectors, sensitive to UV/Vis radiation with wavelengths between 300 - 1100 nm. Both absorption and scattering are witnessed as incident UV/Vis radiation interacts with dissolved and dispersed constituents in milk. These effects can in turn be used to characterize the chemical and physical composition of a milk sample. However, in order to simplify analysis, most existing instrument require dilution of samples to avoid effects of multiple scattering. The sample preparation steps are usually expensive, prone to human errors and unsuitable for field-level and online analysis. This paper introduces a novel digital imaging based method of online spectrophotometric measurements on raw milk without any sample preparation. Multiple LEDs of different emission spectra are used as discrete light sources and a digital CMOS camera is used as an image sensor. The extinction characteristic of samples is derived from captured images. The dependence of multiple scattering on power of incident radiation is exploited to quantify scattering. The method has been validated with experiments for response with varying fat concentrations and fat globule sizes. Despite of the presence of multiple scattering, the method is able to unequivocally quantify extinction of incident radiation and relate it to the fat concentrations and globule sizes of samples.

  15. Expression Detail Synthesis Based on Wavelet-Based Image Fusion%基于小波图像融合的表情细节合成

    Institute of Scientific and Technical Information of China (English)

    王晓慧; 贾珈; 蔡莲红

    2013-01-01

    Expression details are texture changes caused by facial expression, such as wrinkles in the corner of the mouth when smiling and wrinkles on the forehead when surprising. Expression details can help to enhance the realistic experience of synthesized face image. In this paper, we propose to synthesize expression details by using the method of wavelet-based image fusion. We try to mine the texture feature of expression details for natural expression generation. In order to meet the requirements of individual expression detail synthesis, we use different wavelet transforms, such as the traditional wavelet transform and dual-tree complex wavelet transform, and kinds of fusion operators to get rich results. To seamlessly integrate the synthesized image of expression details to the output expressive face image, we select the optimal replacement for both images by clustering and graph cut method. Our proposed approach is applied to not only grayscale images, but also color images by the color space conversion. The experimental results show that the proposed method is effective on the expression detail synthesis, which can enhance the realistic experience of synthesized face image.%表情细节是人脸表情变化时带来的皮肤纹理变化,表情细节合成有助于增强合成表情的真实感.提出了基于小波的图像融合方法,挖掘表情细节的纹理特征本质,并应用到表情细节的合成中,使合成的表情更加真实自然.为了满足表情细节个性化的需求,采用传统的小波变换和双树复小波变换,同时使用不同的融合算子,得到了丰富的表情合成.本方法不仅适用于灰度图像,通过颜色空间的转换还适用于彩色图像.最后还提出了基于聚类和图切割的最优替换区域选取方法,使得合成的表情细节区域与目标图像融为一体.

  16. Interobserver agreement in detailed prenatal diagnosis of congenital heart disease by telemedicine using four-dimensional ultrasound with spatiotemporal image correlation

    NARCIS (Netherlands)

    Adriaanse, B.M.; Tromp, C.H.; Simpson, J.M.; Mieghem, T. van; Kist, W.J.; Kuik, D.J.; Oepkes, D.; Vugt, J.M. van; Haak, M.C.

    2012-01-01

    OBJECTIVE: To evaluate the clinical accuracy of four-dimensional (4D) echocardiography in the detailed prenatal diagnosis of congenital heart disease (CHD) in a telemedicine setting. METHODS: Ten second-trimester spatiotemporal image correlation (STIC) volumes were sent to three observers in differe

  17. Author Details

    African Journals Online (AJOL)

    Journal Home > Advanced Search > Author Details ... Intra‑Operative Airway Management in Patients with Maxillofacial Trauma having Reduction and ... Clinical Parameters and Challenges of Managing Cervicofacial Necrotizing Fasciitis in a ...

  18. Author Details

    African Journals Online (AJOL)

    Journal Home > Advanced Search > Author Details. Log in or ... Difficult airway management in a patient with giant malignant goitre scheduled for thyroidectomy - case report ... Airway Management Dilemma in a Patient with Maxillofacial Injury

  19. Author Details

    African Journals Online (AJOL)

    Journal Home > Advanced Search > Author Details ... Sequencing for Batch Production in a Group Flowline Machine Shop ... Sampling Plans for Monitoring Quality Control Process at a Plastic Manufacturing Firm in Nigeria: A Case Study

  20. Differences in Brand Image of Online Chat Application of Blackberry Messenger, Whatsapp, and Line for Bina Nusantara University’s Student

    Directory of Open Access Journals (Sweden)

    Kuspuji C. B. Wicaksono

    2016-05-01

    Full Text Available This article was written to find out whether there were any differences on brand image for each online chat Application such as Blackberry Messenger, Whatsapp, and LINE based on six factors of the brand image which are: benefits, attributes, cultures, values, personality, and user. Data for the research were collected from questionnaires given to respondents who had used each mention online chat application. Then each respondent was asked to give scores based on the six factors of brand image for each online chat Application. Using the ANOVA method for testing the differences between brand images for each online chat application. The result reveales that there are differences in the brand image between BlackBerry Messenger, Whatsapp, and LINE for benefits, cultures, and values. There is no difference in attributes, and personality cannot be tested. The company that creates online chat application are expected to improve their brand image to distinguish one another differently.

  1. Evaluation of the contrast-detail response of a cardiovascular angiography system and the influence of equipment variables on image quality

    Science.gov (United States)

    Dragusin, Octavian; Smans, Kristien; Jacobs, Jurgen; Inal, Tolga; Bosmans, Hilde

    2008-03-01

    Purpose: To investigate the influence of physician-selectable equipment variables on image quality for a cardiac X-ray system equipped with flat panel detector. Materials and Methods: Two contrast phantoms (Leeds TO.10 and CDRAD) were imaged in fluorography and fluoroscopy mode. Three variables are studied: the detector entrance dose, patient thickness and antiscatter grid. In fluorography mode, the detector entrance dose was 100, 120, 140, 170, 200 and 240 nGy/image. Patient thickness was simulated with Perspex blocks of 8, 12, 16 and 20cm. The detectability of contrast details was visually evaluated by five observers (subjective method). An alternative objective method of image quality evaluation was used. It consists on determining a simple "figure of merit" parameter based on signal-to-noise and dose measurements. Results: The threshold contrast values were determined for different settings. Contrast-detail curves are presented. Conversion of curve data in single numerical values and comparison with the "figure of merit" are discussed. Conclusion: Contrast detail objects are sensitive to variables changed and can be used in optimization process of new systems. The change of detector entrance dose from a superior to a next inferior setting does not change dramatically the image quality. Consequently, a saving of about 15% in patient "skin" dose is achievable.

  2. Online industrial thermography of die casting tooling using dual-wavelength IR imaging

    Science.gov (United States)

    Kourous, Helen E.; Shabestari, Behrouz N.; Luster, Spencer D.; Sacha, Jaroslaw P.

    1998-03-01

    Recent advances in IR system technology coupled with significant reduction sin cost are making thermography a viable tool for on-line monitoring of industrial processes. This paper describes the implementation of a novel rugged thermal imaging system based on a dual-wavelength technique for a large intelligent process monitoring project. The objective of the portion described herein is to deploy a non-contact means of monitoring die cast tooling surface thermal conditions and analyzing the data in the context of the process monitor. The technical and practical challenges of developing such a non-contact thermal measurement system for continuous inspection in an industrial environment are discussed, and methods of resolving them are presented. These challenges include implementation of a wavelength filter system for quantitative determination of the surface temperature. Additionally, emissivity variations of the tooling surface as well as IR reflections are discussed. The primary issues that are addressed, however, are compensation for ambient temperature conditions and optimization of the calibration process. Other issues center on remote camera control, image acquisition, data synchronization, and data interpretation. An example application of this system, along with in-plant images and thermal data, is described.

  3. On-line non-intrusive particle size measurement of pulverised fuel through digital imaging

    Institute of Scientific and Technical Information of China (English)

    2007-01-01

    This paper presents the basic principles of particle size measurement and latest industrial results recorded using an innovative optical instrumentation system designed to measure the size distribution of particles in a pneumatic suspension. The system is non-intrusive and cost-effective. A low-cost CCD camera is used to capture images of the particulate flow field, which is illuminated by a low-cost pulsed laser sheet generator. The particle size distribution is then determined by processing the particle images through the use of novel processing algorithms. Experimental results obtained in the past on a small scale particle flow test rig have demonstrated that the system is capable of measuring the size distribution of pneumatically conveyed particles with an accuracy of a few percent. For the present paper results obtained when testing the system at a 4 MW industrial test facility are presented. Comparisons are made with both off-line reference data achieved through sieving and on-line laser diffraction data recorded using an intrusive, extractive, Malvern Instruments system. In general there is good agreement between results when considering the characteristics and limitations of the individual methodologies. The novel imaging system shows itself to be rugged, practical and useful under genuine industrial conditions.

  4. On-line MR imaging for dose validation of abdominal radiotherapy

    Science.gov (United States)

    Glitzner, M.; Crijns, S. P. M.; de Senneville, B. Denis; Kontaxis, C.; Prins, F. M.; Lagendijk, J. J. W.; Raaymakers, B. W.

    2015-11-01

    For quality assurance and adaptive radiotherapy, validation of the actual delivered dose is crucial. Intrafractional anatomy changes cannot be captured satisfactorily during treatment with hitherto available imaging modalitites. Consequently, dose calculations are based on the assumption of static anatomy throughout the treatment. However, intra- and interfraction anatomy is dynamic and changes can be significant. In this paper, we investigate the use of an MR-linac as a dose tracking modality for the validation of treatments in abdominal targets where both respiratory and long-term peristaltic and drift motion occur. The on-line MR imaging capability of the modality provides the means to perform respiratory gating of both delivery and acquisition yielding a model-free respiratory motion management under free breathing conditions. In parallel to the treatment, the volumetric patient anatomy was captured and used to calculate the applied dose. Subsequently, the individual doses were warped back to the planning grid to obtain the actual dose accumulated over the entire treatment duration. Ultimately, the planned dose was validated by comparison with the accumulated dose. Representative for a site subject to breathing modulation, two kidney cases (25 Gy target dose) demonstrated the working principle on volunteer data and simulated delivery. The proposed workflow successfully showed its ability to track local dosimetric changes. Integration of the on-line anatomy information could reveal local dose variations  -2.3-1.5 Gy in the target volume of a volunteer dataset. In the adjacent organs at risk, high local dose errors ranging from  -2.5 to 1.9 Gy could be traced back.

  5. Automated analysis of heterogeneous carbon nanostructures by high-resolution electron microscopy and on-line image processing

    Energy Technology Data Exchange (ETDEWEB)

    Toth, P., E-mail: toth.pal@uni-miskolc.hu [Department of Chemical Engineering, University of Utah, 50 S. Central Campus Drive, Salt Lake City, UT 84112-9203 (United States); Farrer, J.K. [Department of Physics and Astronomy, Brigham Young University, N283 ESC, Provo, UT 84602 (United States); Palotas, A.B. [Department of Combustion Technology and Thermal Energy, University of Miskolc, H3515, Miskolc-Egyetemvaros (Hungary); Lighty, J.S.; Eddings, E.G. [Department of Chemical Engineering, University of Utah, 50 S. Central Campus Drive, Salt Lake City, UT 84112-9203 (United States)

    2013-06-15

    High-resolution electron microscopy is an efficient tool for characterizing heterogeneous nanostructures; however, currently the analysis is a laborious and time-consuming manual process. In order to be able to accurately and robustly quantify heterostructures, one must obtain a statistically high number of micrographs showing images of the appropriate sub-structures. The second step of analysis is usually the application of digital image processing techniques in order to extract meaningful structural descriptors from the acquired images. In this paper it will be shown that by applying on-line image processing and basic machine vision algorithms, it is possible to fully automate the image acquisition step; therefore, the number of acquired images in a given time can be increased drastically without the need for additional human labor. The proposed automation technique works by computing fields of structural descriptors in situ and thus outputs sets of the desired structural descriptors in real-time. The merits of the method are demonstrated by using combustion-generated black carbon samples. - Highlights: ► The HRTEM analysis of heterogeneous nanostructures is a tedious manual process. ► Automatic HRTEM image acquisition and analysis can improve data quantity and quality. ► We propose a method based on on-line image analysis for the automation of HRTEM image acquisition. ► The proposed method is demonstrated using HRTEM images of soot particles.

  6. Using Hyperspectral Frame Images from Unmanned Airborne Vehicle for Detailed Measurement of Boreal Forest 3D Structure

    Science.gov (United States)

    de Oliveira, Raquel A.; Tommaselli, Antonio M. G.; Honkavaara, Eija

    2016-10-01

    Objective of this work was to investigate the feasibility of using multi-image matching and information extracted from image classification to improve strategies in generation of point clouds of 3D forest scene. Image data sets were collected by a Fabry-Pérot interferometer (FPI) based hyperspectral frame camera on-board a UAV in a boreal forest area. The results of the new method are analysed and compared with commercial software and LiDAR data. Experiments showed that the point clouds generated with the proposed algorithm fitted better with the LiDAR data at the ground level, which is favourable for digital terrain model (DTM) extraction.

  7. Masterpieces unmasked: New high-resolution infrared cameras produce rich, detailed images of artwork, and create new controversies

    CERN Document Server

    Marshall, J

    2002-01-01

    Luca Pezzati is a physicist who heads a group called Art Diagnostics, which is a part of the Opificio delle Pietre Dure, an institute devoted to the research and conservation of artworks in Italy. Pezzati and his group use high-resolution infrared scanning device to produce colour images of what lies below the surface of paintings. Their scanner is able to produce the best-known quality of images without harming the painting under examination (1 page).

  8. Methods for destriping Landsat Thematic Mapper images - A feasibility study for an online destriping process in the Thematic Mapper Image Processing System (TIPS)

    Science.gov (United States)

    Poros, D. J.; Peterson, C. J.

    1985-01-01

    Methods for destriping TM images and results of the application of these methods to selected TM scenes with sensor and scan striping, which was not removed by the radiometric correction during the TM Archive Generation Phase in TIPS, are presented. These methods correct only for gain and offset differences between detectors over many image lines and do not consider within-line effects. The feasibility of implementing a destriping process online in TIPS is also described.

  9. Online 4d Reconstruction Using Multi-Images Available Under Open Access

    Science.gov (United States)

    Ioannides, M.; Hadjiprocopi, A.; Doulamis, N.; Doulamis, A.; Protopapadakis, E.; Makantasis, K.; Santos, P.; Fellner, D.; Stork, A.; Balet, O.; Julien, M.; Weinlinger, G.; Johnson, P. S.; Klein, M.; Fritsch, D.

    2013-07-01

    The advent of technology in digital cameras and their incorporation into virtually any smart mobile device has led to an explosion of the number of photographs taken every day. Today, the number of images stored online and available freely has reached unprecedented levels. It is estimated that in 2011, there were over 100 billion photographs stored in just one of the major social media sites. This number is growing exponentially. Moreover, advances in the fields of Photogrammetry and Computer Vision have led to significant breakthroughs such as the Structure from Motion algorithm which creates 3D models of objects using their twodimensional photographs. The existence of powerful and affordable computational machinery not only the reconstruction of complex structures but also entire cities. This paper illustrates an overview of our methodology for producing 3D models of Cultural Heritage structures such as monuments and artefacts from 2D data (pictures, video), available on Internet repositories, social media, Google Maps, Bing, etc. We also present new approaches to semantic enrichment of the end results and their subsequent export to Europeana, the European digital library, for integrated, interactive 3D visualisation within regular web browsers using WebGl and X3D. Our main goal is to enable historians, architects, archaeologists, urban planners and affiliated professionals to reconstruct views of historical structures from millions of images floating around the web and interact with them.

  10. Factors Influencing Patients' Perspectives of Radiology Imaging Centers: Evaluation Using an Online Social Media Ratings Website.

    Science.gov (United States)

    Doshi, Ankur M; Somberg, Molly; Rosenkrantz, Andrew B

    2016-02-01

    The goal of this study was to use patient reviews posted on Yelp.com, an online ratings website, to identify factors most commonly associated with positive versus negative patient perceptions of radiology imaging centers across the United States. A total of 126 outpatient radiology centers from the 46 largest US cities were identified using Yelp.com; 1,009 patient reviews comprising 2,582 individual comments were evaluated. Comments were coded as pertaining to either the radiologist or other service items, and as expressing either a positive or negative opinion. Distribution of comments was compared with center ratings using Fisher's exact test. Overall, 14% of comments were radiologist related; 86% pertained to other aspects of service quality. Radiologist-related negative comments more frequent in low-performing centers (mean rating ≤2 on 1-5 scale) than high-performing centers (rating ≥4) pertained to imaging equipment (25% versus 7%), report content (25% versus 2%), and radiologist professionalism (25% versus 2%) (P culture throughout their practice. Copyright © 2016 American College of Radiology. Published by Elsevier Inc. All rights reserved.

  11. On-Line Multi-Damage Scanning Spatial-Wavenumber Filter Based Imaging Method for Aircraft Composite Structure

    Directory of Open Access Journals (Sweden)

    Yuanqiang Ren

    2017-05-01

    Full Text Available Structural health monitoring (SHM of aircraft composite structure is helpful to increase reliability and reduce maintenance costs. Due to the great effectiveness in distinguishing particular guided wave modes and identifying the propagation direction, the spatial-wavenumber filter technique has emerged as an interesting SHM topic. In this paper, a new scanning spatial-wavenumber filter (SSWF based imaging method for multiple damages is proposed to conduct on-line monitoring of aircraft composite structures. Firstly, an on-line multi-damage SSWF is established, including the fundamental principle of SSWF for multiple damages based on a linear piezoelectric (PZT sensor array, and a corresponding wavenumber-time imaging mechanism by using the multi-damage scattering signal. Secondly, through combining the on-line multi-damage SSWF and a PZT 2D cross-shaped array, an image-mapping method is proposed to conduct wavenumber synthesis and convert the two wavenumber-time images obtained by the PZT 2D cross-shaped array to an angle-distance image, from which the multiple damages can be directly recognized and located. In the experimental validation, both simulated multi-damage and real multi-damage introduced by repeated impacts are performed on a composite plate structure. The maximum localization error is less than 2 cm, which shows good performance of the multi-damage imaging method. Compared with the existing spatial-wavenumber filter based damage evaluation methods, the proposed method requires no more than the multi-damage scattering signal and can be performed without depending on any wavenumber modeling or measuring. Besides, this method locates multiple damages by imaging instead of the geometric method, which helps to improve the signal-to-noise ratio. Thus, it can be easily applied to on-line multi-damage monitoring of aircraft composite structures.

  12. On-Line Multi-Damage Scanning Spatial-Wavenumber Filter Based Imaging Method for Aircraft Composite Structure.

    Science.gov (United States)

    Ren, Yuanqiang; Qiu, Lei; Yuan, Shenfang; Bao, Qiao

    2017-05-11

    Structural health monitoring (SHM) of aircraft composite structure is helpful to increase reliability and reduce maintenance costs. Due to the great effectiveness in distinguishing particular guided wave modes and identifying the propagation direction, the spatial-wavenumber filter technique has emerged as an interesting SHM topic. In this paper, a new scanning spatial-wavenumber filter (SSWF) based imaging method for multiple damages is proposed to conduct on-line monitoring of aircraft composite structures. Firstly, an on-line multi-damage SSWF is established, including the fundamental principle of SSWF for multiple damages based on a linear piezoelectric (PZT) sensor array, and a corresponding wavenumber-time imaging mechanism by using the multi-damage scattering signal. Secondly, through combining the on-line multi-damage SSWF and a PZT 2D cross-shaped array, an image-mapping method is proposed to conduct wavenumber synthesis and convert the two wavenumber-time images obtained by the PZT 2D cross-shaped array to an angle-distance image, from which the multiple damages can be directly recognized and located. In the experimental validation, both simulated multi-damage and real multi-damage introduced by repeated impacts are performed on a composite plate structure. The maximum localization error is less than 2 cm, which shows good performance of the multi-damage imaging method. Compared with the existing spatial-wavenumber filter based damage evaluation methods, the proposed method requires no more than the multi-damage scattering signal and can be performed without depending on any wavenumber modeling or measuring. Besides, this method locates multiple damages by imaging instead of the geometric method, which helps to improve the signal-to-noise ratio. Thus, it can be easily applied to on-line multi-damage monitoring of aircraft composite structures.

  13. Use of MODIS satellite images for detailed lake morphometry: Application to basins with large water level fluctuations

    Science.gov (United States)

    Ovakoglou, George; Alexandridis, Thomas K.; Crisman, Thomas L.; Skoulikaris, Charalampos; Vergos, George S.

    2016-09-01

    Lake morphometry is essential for managing water resources and limnetic ecosystems. For reservoirs that receive high sediment loads, frequent morphometric mapping is necessary to define both the effective life of the reservoir and its water storage capacity for irrigation, power generation, flood control and domestic water supply. The current study presents a methodology for updating the digital depth model (DDM) of lakes and reservoirs with wide intra and interannual fluctuations of water levels using satellite remote sensing. A time series of Terra MODIS satellite images was used to map shorelines formed during the annual water level change cycle, and were validated with concurrent Landsat ETM+ satellite images. The shorelines were connected with in-situ observation of water levels and were treated as elevation contours to produce the DDM using spatial interpolation. The accuracy of the digitized shorelines is within the mapping accuracy of the satellite images, while the resulting DDM is validated using in-situ elevation measurements. Two versions of the DDM were produced to assess the influence of seasonal water fluctuation. Finally, the methodology was applied to Lake Kerkini (Greece) to produce an updated DDM, which was compared with the last available bathymetric survey (1991) and revealed changes in sediment distribution within the lake.

  14. Computed tomography:the details.

    Energy Technology Data Exchange (ETDEWEB)

    Doerry, Armin Walter

    2007-07-01

    Computed Tomography (CT) is a well established technique, particularly in medical imaging, but also applied in Synthetic Aperture Radar (SAR) imaging. Basic CT imaging via back-projection is treated in many texts, but often with insufficient detail to appreciate subtleties such as the role of non-uniform sampling densities. Herein are given some details often neglected in many texts.

  15. Detailed in situ laser calibration of the infrared imaging video bolometer for the JT-60U tokamak

    Science.gov (United States)

    Parchamy, H.; Peterson, B. J.; Konoshima, S.; Hayashi, H.; Seo, D. C.; Ashikawa, N.; JT-60U Team

    2006-10-01

    The infrared imaging video bolometer (IRVB) in JT-60U includes a single graphite-coated gold foil with an effective area of 9 × 7 cm 2 and a thickness of 2.5 μ m . The thermal images of the foil resulting from the plasma radiation are provided by an IR camera. The calibration technique of the IRVB gives confidence in the absolute levels of the measured values of the plasma radiation. The in situ calibration is carried out in order to obtain local foil properties such as the thermal diffusivity κ and the product of the thermal conductivity k and the thickness t f of the foil. These quantities are necessary for solving the two-dimensional heat diffusion equation of the foil which is used in the experiments. These parameters are determined by comparing the measured temperature profiles (for k t f ) and their decays (for κ ) with the corresponding results of a finite element model using the measured HeNe laser power profile as a known radiation power source. The infrared camera (Indigo/Omega) is calibrated by fitting the temperature rise of a heated plate to the resulting camera data using the Stefan-Boltzmann law.

  16. Detailed Geophysical Imaging in San Pablo Bay Reveals a New Strand of the Hayward-Rodgers Creek Fault Zone

    Science.gov (United States)

    Watt, J. T.; Ponce, D. A.; Hart, P. E.; Denton, K. M.; Parsons, T.; Graymer, R. W.

    2015-12-01

    High-resolution chirp seismic-reflection and marine magnetic data collected in San Pablo Bay reveal a new strand of the Hayward fault that helps constrain the geometry and connectivity of the Hayward-Rodgers Creek fault zone, one of the most hazardous faults in California. Over 1,200 km of marine magnetic data were collected in San Pablo Bay along NE-trending traverses spaced 200-m apart, and approximately 200 km of chirp data were collected along similarly oriented profiles spaced 1-km apart. Data were acquired using a 0.7-12 kHz sweep with a 20 ms length fired at 6 times per second. Due to attenuation of the acoustic signal by bay muds and persistent natural gas layers in San Pablo Bay, chirp data are only able to image the upper 2 to 5 meters of the sub-seafloor. Offset and warping of near-surface reflections delineates a previously unrecognized NW-trending strand of the Hayward fault that extends across San Pablo Bay, from Point Pinole to Lower Tubbs Island. Vertical offset along the fault varies in both direction and magnitude, with some indication of increasing offset with depth. The fault imaged in the chirp data corresponds to gravity, magnetic, and tomographic gradients in the bay. Relocated seismicity is aligned with the surface trace of the fault and repeating earthquakes along this trend suggest this strand of the Hayward fault is creeping. A northwestward onshore projection of this fault is coincident with gravity and topographic gradients that align with a SSE-trending splay of the Rodgers Creek Fault, suggesting the Hayward and Rodgers Creek faults may connect directly rather than through a wide step-over zone. Even if the faults do not directly connect, these new data indicate that the faults are much closer together (2 km vs 4 km) than previously thought, making a through-going rupture more plausible.

  17. Development of an online radiology case review system featuring interactive navigation of volumetric image datasets using advanced visualization techniques

    Energy Technology Data Exchange (ETDEWEB)

    Yang, Hyun Kyung; Kim, Boh Kyoung; Jung, Ju Hyun; Kang, Heung Sik; Lee, Kyoung Ho [Dept. of Radiology, Seoul National University Bundang Hospital, Seongnam (Korea, Republic of); Woo, Hyun Soo [Dept. of Radiology, SMG-SNU Boramae Medical Center, Seoul (Korea, Republic of); Jo, Jae Min [Dept. of Computer Science and Engineering, Seoul National University, Seoul (Korea, Republic of); Lee, Min Hee [Dept. of Radiology, Soonchunhyang University Bucheon Hospital, Bucheon (Korea, Republic of)

    2015-11-15

    To develop an online radiology case review system that allows interactive navigation of volumetric image datasets using advanced visualization techniques. Our Institutional Review Board approved the use of the patient data and waived the need for informed consent. We determined the following system requirements: volumetric navigation, accessibility, scalability, undemanding case management, trainee encouragement, and simulation of a busy practice. The system comprised a case registry server, client case review program, and commercially available cloud-based image viewing system. In the pilot test, we used 30 cases of low-dose abdomen computed tomography for the diagnosis of acute appendicitis. In each case, a trainee was required to navigate through the images and submit answers to the case questions. The trainee was then given the correct answers and key images, as well as the image dataset with annotations on the appendix. After evaluation of all cases, the system displayed the diagnostic accuracy and average review time, and the trainee was asked to reassess the failed cases. The pilot system was deployed successfully in a hands-on workshop course. We developed an online radiology case review system that allows interactive navigation of volumetric image datasets using advanced visualization techniques.

  18. Social image of students who shop and don't shop online.

    Science.gov (United States)

    Lammers, H Bruce; Curren, Mary T; Cours, Deborah; Lammers, Marilyn L

    2003-06-01

    A descriptive survey of a stratified random sample of 326 undergraduates from a large, diverse university in Los Angeles was conducted to assess whether resistance to online shopping might be, in part, related to negative social perceptions of those who shop online. Indirect questioning showed that students perceived online student shoppers as more lazy and less likely to fear for the safety and security of others but also as more trustworthy, attractive, successful, and smart. Differences in social perceptions were not related to these students' own online spending.

  19. A before and after study of the impact of academic detailing on the use of diagnostic imaging for shoulder complaints in general practice

    Science.gov (United States)

    Broadhurst, Norm A; Barton, Christopher A; Rowett, Debra; Yelland, Lisa; Matin, David K; Gialamas, Angela; Beilby, Justin J

    2007-01-01

    Background The aim of this study was to assess the impact that Academic Detailing (AD) had on General Practitioners' use of diagnostic imaging for shoulder complaints in general practice and their knowledge and confidence to manage shoulder pain. Methods One-to-one Academic Detailing (AD) for management of shoulder pain was delivered to 87 General Practitioners (GPs) in metropolitan Adelaide, South Australia, together with locally developed clinical guidelines and a video/DVD on how to examine the shoulder. Three months after the initial AD a further small group or an individual follow up session was offered. A 10-item questionnaire to assess knowledge about the shoulders was administered before, immediately after, and 3 months after AD, together with questions to assess confidence to manage shoulder complaints. The number of requests for plain film (X-ray) and ultrasound (US) imaging of the shoulder was obtained for the intervention group as well as a random comparison group of 90 GP's from the same two Divisions. The change in the rate of requests was assessed using a log Poisson GEE with adjustment for clustering at the practice level. A linear mixed effects model was used to analyse changes in knowledge. Results In an average week 54% of GPs reported seeing fewer than 6 patients with shoulder problems. Mean (SD) GP knowledge score before, immediately after and 3-months after AD, was 6.2/10 (1.5); 8.6/10 (0.96) and; 7.2/10 (1.5) respectively (p < 0.0001). Three months after AD, GPs reported feeling able to take a more meaningful history, more confident managing shoulder pain, and felt their management of shoulder pain had improved. Requests for ultrasound imaging were approximately 43.8% higher in the period 2 years before detailing compared to six months after detailing (p < 0.0001), but an upward trend toward baseline was observed in the period 6 months to 1 year after AD. There was no statistically significant change in the rate of requests from before to

  20. Label-free and highly sensitive optical imaging of detailed microcirculation within meninges and cortex in mice with the cranium left intact

    Science.gov (United States)

    Jia, Yali; An, Lin; Wang, Ruikang K.

    2010-05-01

    We demonstrate for the first time that the detailed blood flow distribution within intracranial dura mater and cortex can be visualized by an ultrahigh sensitive optical microangiography (UHS-OMAG). The study uses an UHS-OMAG system operating at 1310 nm with an imaging speed at 150 frames per second that requires ~10 s to complete one 3-D scan of ~2.5×2.5 mm2. The system is sensitive to blood flow with a velocity ranging from ~4 μm/s to ~23 mm/s. We show superior performance of UHS-OMAG in providing functional images of capillary level microcirculation within meninges in mice with the cranium left intact, the results of which correlate well with the standard dural histopathology.

  1. Automated Critical Test Findings Identification and Online Notification System Using Artificial Intelligence in Imaging.

    Science.gov (United States)

    Prevedello, Luciano M; Erdal, Barbaros S; Ryu, John L; Little, Kevin J; Demirer, Mutlu; Qian, Songyue; White, Richard D

    2017-07-03

    Purpose To evaluate the performance of an artificial intelligence (AI) tool using a deep learning algorithm for detecting hemorrhage, mass effect, or hydrocephalus (HMH) at non-contrast material-enhanced head computed tomographic (CT) examinations and to determine algorithm performance for detection of suspected acute infarct (SAI). Materials and Methods This HIPAA-compliant retrospective study was completed after institutional review board approval. A training and validation dataset of noncontrast-enhanced head CT examinations that comprised 100 examinations of HMH, 22 of SAI, and 124 of noncritical findings was obtained resulting in 2583 representative images. Examinations were processed by using a convolutional neural network (deep learning) using two different window and level configurations (brain window and stroke window). AI algorithm performance was tested on a separate dataset containing 50 examinations with HMH findings, 15 with SAI findings, and 35 with noncritical findings. Results Final algorithm performance for HMH showed 90% (45 of 50) sensitivity (95% confidence interval [CI]: 78%, 97%) and 85% (68 of 80) specificity (95% CI: 76%, 92%), with area under the receiver operating characteristic curve (AUC) of 0.91 with the brain window. For SAI, the best performance was achieved with the stroke window showing 62% (13 of 21) sensitivity (95% CI: 38%, 82%) and 96% (27 of 28) specificity (95% CI: 82%, 100%), with AUC of 0.81. Conclusion AI using deep learning demonstrates promise for detecting critical findings at noncontrast-enhanced head CT. A dedicated algorithm was required to detect SAI. Detection of SAI showed lower sensitivity in comparison to detection of HMH, but showed reasonable performance. Findings support further investigation of the algorithm in a controlled and prospective clinical setting to determine whether it can independently screen noncontrast-enhanced head CT examinations and notify the interpreting radiologist of critical findings

  2. Imaging the Alpine Fault: preliminary results from a detailed 3D-VSP experiment at the DFDP-2 drill site in Whataroa, New Zealand

    Science.gov (United States)

    Lay, Vera; Bodenburg, Sascha; Buske, Stefan; Townend, John; Kellett, Richard; Savage, Martha; Schmitt, Douglas; Constantinou, Alexis; Eccles, Jennifer; Lawton, Donald; Hall, Kevin; Bertram, Malcolm; Gorman, Andrew

    2017-04-01

    The plate-bounding Alpine Fault in New Zealand is an 850 km long transpressive continental fault zone that is late in its earthquake cycle. The Deep Fault Drilling Project (DFDP) aims to deliver insight into the geological structure of this fault zone and its evolution by drilling and sampling the Alpine Fault at depth. Previously analysed 2D reflection seismic data image the main Alpine Fault reflector at a depth of 1.5-2.2 km with a dip of approximately 48° to the southeast below the DFDP-2 borehole. Additionally, there are indications of a more complex 3D fault structure with several fault branches which have not yet been clearly imaged in detail. For that reason we acquired a 3D-VSP seismic data set at the DFDP-2 drill site in January 2016. A zero-offset VSP and a walk-away VSP survey were conducted using a Vibroseis source. Within the borehole, a permanently installed "Distributed Acoustic Fibre Optic Cable" (down to 893 m) and a 3C Sercel slimwave tool (down to 400 m) were used to record the seismic wavefield. In addition, an array of 160 three-component receivers with a spacing of 10 m perpendicular and 20 m parallel to the main strike of the Alpine Fault was set up and moved successively along the valley to record reflections from the main Alpine Fault zone over a broad depth range and to derive a detailed 3D tomographic velocity model in the hanging wall. We will show a detailed 3D velocity model derived from first-arrival traveltime tomography. Subsets of the whole data set were analysed separately to estimate the corresponding ray coverage and the reliability of the observed features in the obtained velocity model. By testing various inversion parameters and starting models, we derived a detailed near-surface velocity model that reveals the significance of the old glacial valley structures. Hence, this new 3D model improves the velocity model derived previously from a 2D seismic profile line in that area. Furthermore, processing of the dense 3C data

  3. Online pretreatment verification of high-dose rate brachytherapy using an imaging panel

    Science.gov (United States)

    Fonseca, Gabriel P.; Podesta, Mark; Bellezzo, Murillo; Van den Bosch, Michiel R.; Lutgens, Ludy; Vanneste, Ben G. L.; Voncken, Robert; Van Limbergen, Evert J.; Reniers, Brigitte; Verhaegen, Frank

    2017-07-01

    Brachytherapy is employed to treat a wide variety of cancers. However, an accurate treatment verification method is currently not available. This study describes a pre-treatment verification system that uses an imaging panel (IP) to verify important aspects of the treatment plan. A detailed modelling of the IP was only possible with an extensive calibration performed using a robotic arm. Irradiations were performed with a high dose rate (HDR) 192Ir source within a water phantom. An empirical fit was applied to measure the distance between the source and the detector so 3D Cartesian coordinates of the dwell positions can be obtained using a single panel. The IP acquires 7.14 fps to verify the dwell times, dwell positions and air kerma strength (Sk). A gynecological applicator was used to create a treatment plan that was registered with a CT image of the water phantom used during the experiments for verification purposes. Errors (shifts, exchanged connections and wrong dwell times) were simulated to verify the proposed verification system. Cartesian source positions (panel measurement plane) have a standard deviation of about 0.02 cm. The measured distance between the source and the panel (z-coordinate) have a standard deviation up to 0.16 cm and maximum absolute error of  ≈0.6 cm if the signal is close to sensitive limit of the panel. The average response of the panel is very linear with Sk. Therefore, Sk measurements can be performed with relatively small errors. The measured dwell times show a maximum error of 0.2 s which is consistent with the acquisition rate of the panel. All simulated errors were clearly identified by the proposed system. The use of IPs is not common in brachytherapy, however, it provides considerable advantages. It was demonstrated that the IP can accurately measure Sk, dwell times and dwell positions.

  4. Image quality performance of liquid crystal display systems: influence of display resolution, magnification and window settings on contrast-detail detection.

    Science.gov (United States)

    Bacher, Klaus; Smeets, Peter; De Hauwere, An; Voet, Tony; Duyck, Philippe; Verstraete, Koenraad; Thierens, Hubert

    2006-06-01

    The aim of this study was to investigate the combined effects of liquid crystal display (LCD) resolution, image magnification and window/level adjustment on the low-contrast performance in soft-copy image interpretation in digital radiography and digital mammography. In addition, the effect of a new LCD noise reduction mechanism on the low-contrast detectability was studied. Digital radiographs and mammograms of two dedicated contrast-detail phantoms (CDRAD 2.0 and CDMAM 3.4) were scored on five LCD devices with varying resolutions (1-3- and 5-megapixel) and one dedicated 5-megapixel cathode ray tube monitor. Two 5-megapixel LCDs were included. The first one was a standard 5-megapixel LCD and the second had a new (Per Pixel Uniformity) noise reduction mechanism. A multi-variate analysis of variance revealed a significant influence of LCD resolution, image magnification and window/level adjustment on the image quality performance assessed with both the CDRAD 2.0 and the CDMAM 3.4 phantoms. The interactive adjustment of brightness and contrast of digital images did not affect the reading time, whereas magnification to full resolution resulted in a significantly slower soft-copy interpretation. For digital radiography applications, a 3-megapixel LCD is comparable with a 5-megapixel CRT monitor in terms of low-contrast performance as well as in reading time. The use of a 2-megapixel LCD is only warranted when radiographs are analysed in full resolution and when using the interactive window/level adjustment. In digital mammography, a 5-megapixel monitor should be the first choice. In addition, the new PPU noise reduction system in the 5-megapixel LCD devices provides significantly better results for mammography reading as compared to a standard 5-magapixel LCD or CRT. If a 3-megapixel LCD is used in mammography setting, a very time-consuming magnification of the digital mammograms would be necessary.

  5. Image quality performance of liquid crystal display systems: Influence of display resolution, magnification and window settings on contrast-detail detection

    Energy Technology Data Exchange (ETDEWEB)

    Bacher, Klaus [Department of Medical Physics and Radiation Protection, Ghent University, Proeftuinstraat 86, B-9000 Gent (Belgium)]. E-mail: klaus.bacher@ugent.be; Smeets, Peter [Department of Radiology, Ghent University Hospital, De Pintelaan 185, B-9000 Gent (Belgium); De Hauwere, An [Department of Medical Physics and Radiation Protection, Ghent University, Proeftuinstraat 86, B-9000 Gent (Belgium); Voet, Tony [Department of Radiology, Ghent University Hospital, De Pintelaan 185, B-9000 Gent (Belgium); Duyck, Philippe [Department of Radiology, Ghent University Hospital, De Pintelaan 185, B-9000 Gent (Belgium); Verstraete, Koenraad [Department of Radiology, Ghent University Hospital, De Pintelaan 185, B-9000 Gent (Belgium); Thierens, Hubert [Department of Medical Physics and Radiation Protection, Ghent University, Proeftuinstraat 86, B-9000 Gent (Belgium)

    2006-06-15

    The aim of this study was to investigate the combined effects of liquid crystal display (LCD) resolution, image magnification and window/level adjustment on the low-contrast performance in soft-copy image interpretation in digital radiography and digital mammography. In addition, the effect of a new LCD noise reduction mechanism on the low-contrast detectability was studied. Digital radiographs and mammograms of two dedicated contrast-detail phantoms (CDRAD 2.0 and CDMAM 3.4) were scored on five LCD devices with varying resolutions (1-3- and 5-megapixel) and one dedicated 5-megapixel cathode ray tube monitor. Two 5-megapixel LCDs were included. The first one was a standard 5-megapixel LCD and the second had a new (Per Pixel Uniformity) noise reduction mechanism. A multi-variate analysis of variance revealed a significant influence of LCD resolution, image magnification and window/level adjustment on the image quality performance assessed with both the CDRAD 2.0 and the CDMAM 3.4 phantoms. The interactive adjustment of brightness and contrast of digital images did not affect the reading time, whereas magnification to full resolution resulted in a significantly slower soft-copy interpretation. For digital radiography applications, a 3-megapixel LCD is comparable with a 5-megapixel CRT monitor in terms of low-contrast performance as well as in reading time. The use of a 2-megapixel LCD is only warranted when radiographs are analysed in full resolution and when using the interactive window/level adjustment. In digital mammography, a 5-megapixel monitor should be the first choice. In addition, the new PPU noise reduction system in the 5-megapixel LCD devices provides significantly better results for mammography reading as compared to a standard 5-magapixel LCD or CRT. If a 3-megapixel LCD is used in mammography setting, a very time-consuming magnification of the digital mammograms would be necessary.

  6. A before and after study of the impact of academic detailing on the use of diagnostic imaging for shoulder complaints in general practice

    Directory of Open Access Journals (Sweden)

    Gialamas Angela

    2007-03-01

    Full Text Available Abstract Background The aim of this study was to assess the impact that Academic Detailing (AD had on General Practitioners' use of diagnostic imaging for shoulder complaints in general practice and their knowledge and confidence to manage shoulder pain. Methods One-to-one Academic Detailing (AD for management of shoulder pain was delivered to 87 General Practitioners (GPs in metropolitan Adelaide, South Australia, together with locally developed clinical guidelines and a video/DVD on how to examine the shoulder. Three months after the initial AD a further small group or an individual follow up session was offered. A 10-item questionnaire to assess knowledge about the shoulders was administered before, immediately after, and 3 months after AD, together with questions to assess confidence to manage shoulder complaints. The number of requests for plain film (X-ray and ultrasound (US imaging of the shoulder was obtained for the intervention group as well as a random comparison group of 90 GP's from the same two Divisions. The change in the rate of requests was assessed using a log Poisson GEE with adjustment for clustering at the practice level. A linear mixed effects model was used to analyse changes in knowledge. Results In an average week 54% of GPs reported seeing fewer than 6 patients with shoulder problems. Mean (SD GP knowledge score before, immediately after and 3-months after AD, was 6.2/10 (1.5; 8.6/10 (0.96 and; 7.2/10 (1.5 respectively (p Conclusion These results provide evidence that AD together with education materials and guidelines can improve GPs' knowledge and confidence to manage shoulder problems and reduce the use of imaging, at least in the short term.

  7. Multimodal Imaging Techniques for the Extraction of Detailed Geometrical and Physiological Information for Use in Multi-Scale Models of Colorectal Cancer and Treatment of Individual Patients

    Directory of Open Access Journals (Sweden)

    Joe Pitt-Francis

    2006-01-01

    Full Text Available A vast array of mathematical models have been proposed for all stages of cancer formation across a wide range of spatio–temporal scales. Attention is now turning to coupling these models across scales and building models of “virtual tumours” for use in in silico testing of novel drugs and treatment regimes. This leads naturally to the requirement for detailed knowledge of the underlying geometry and physiological properties of individual tumours for use in: (i multi-scale mathematical models of in vivo tumour growth and development; (ii fusion of multi-scale, multimodal medical imaging techniques to improve the diagnosis and treatment of individual patients; and (iii training of cancer specialists and surgeons.

  8. Real time and online dynamic speckle assessment of growing bacteria using the method of motion history image

    Science.gov (United States)

    Ansari, Mohammad Zaheer; Ramírez-Miquet, Evelio E.; Otero, Isabel; Rodríguez, Dania; Darias, Juan G.

    2016-06-01

    This paper reports the application of the motion history image (MHI) method for biospeckle processing of a bacterial growth. The method avoids the complexity as well as the large computation in sequence-matching-based methods and detects whether the speckle structure has changed or not. Encouraging experimental results on the real-time evolution of the growing bacteria during 12 h demonstrate the effectiveness of the proposed method. The MHI presented an online result without loss of resolution and definition. In turn, the MHI also presented the ability to provide a close answer to the traditional offline method of generalized differences.

  9. ["Second opinion" in online radiology via Internet: report on implementation and analysis of reliability of findings in sectional images].

    Science.gov (United States)

    Ricke, J; van der Donk, E; Wolf, M; Ostendorf, B; Hosten, N; Zielinski, C; Liebig, T; Stroszczinski, C; Lopez-Hänninen, E; Lemke, A J; Gillessen, C; Gürvit, O; Amthauer, H; Kleinholz, L; Bartelink, H; Felix, R

    1997-01-01

    Numerous medical on-line services have already been established in the world-wide internet. In connection with the Information service TELESCAN, sponsored by the EU, a pilot project has been initiated which offers a radiological "second opinion" via the transmission of radiological findings and images that have been previously rendered anonymous. In addition to a description of the basic implementation, tests of the diagnostic certainty of the transmitted cranial computed tomographs have been performed. The CT images were digitized with a document camera, transmitted over the Internet, and then evaluated on the receiver's monitor. Both the transfer of originally generated digital image files (in ACR-NEMA or DICOM) as well as graphic files after digitization of X-ray films, for example by a document camera, is possible via electronic post (e-mail). Visualization by the receiver requires the use of current proprietary software for special medical image formats, while standard graphic formats such as GIFF or JPEG can be visualized with the usual Internet software. In an ROC analysis, 56 individual images of cranial computed tomographs, half with pathological findings such as space-occupying lesions, infarcts, or brain edema, were tested with regard to the diagnostic certainty after digitization and transmission. In comparison with the original film findings, there was a slight but statistically not significant reduction in diagnostic certainty of the images evaluated on screen after transfer via the Internet. We believe that this result is due to the low local resolution, low dynamic range, the high image noise and of CT arising from the window technique. The same parameters are probably valid for MRI. The result cannot be applied to conventional radiography including mammography because, in comparison to the mentioned image techniques, their local resolution is high and image noise is considerably lower.

  10. Huntington's disease mouse models online: high-resolution MRI images with stereotaxic templates for computational neuroanatomy.

    Directory of Open Access Journals (Sweden)

    Stephen J Sawiak

    Full Text Available Magnetic resonance imaging (MRI has proved to be an ideal modality for non-destructive and highly detailed assessment of structural morphology in biological tissues. Here we used MRI to make a dataset of ex vivo brains from two different rodent models of Huntington's disease (HD, the R6/2 line and the YAC 128 mouse. We are making the whole dataset (399 transgenic HD and wildtype (WT brains, from mice aged 9-80 weeks publicly available. These data will be useful, not only to investigators interested in the study of HD, but also to researchers of computational neuroanatomy who may not have access to such large datasets from mouse models. Here we demonstrate a number of uses of such data, for example to produce maps of grey and white matter and cortical thickness. As an example of how the library might provide insights in mouse models of HD, we calculated whole brain grey matter volumes across different age groups with different numbers of cytosine-adenine-guanine (CAG repeats in a fragment of the gene responsible for HD in humans. (The R6/2 dataset was obtained from an allelic series of R6/2 mice carrying a range of CAG repeat lengths between 109 and 464. This analysis revealed different trajectories for each fragment length. In particular there was a gradient of decreasing pathology with longer CAG repeat lengths, reflecting our previous findings with behavioural and histological studies. There will be no constraints placed on the use of the datasets included here. The original data will be easily and permanently accessible via the University of Cambridge data repository (http://www.dspace.cam.ac.uk/handle/1810/243361.

  11. X-MIME: An Imaging X-ray Spectrometer for Detailed Study of Jupiter's Icy Moons and the Planet's X-ray Aurora

    Science.gov (United States)

    Elsner, R. F.; Ramsey, B. D.; Waite, J. H.; Rehak, P.; Johnson, R. E.; Cooper, J. F.; Swartz, D. A.

    2004-01-01

    Remote observations with the Chandra X-ray Observatory and the XMM-Newton Observatory have shown that the Jovian system is a source of x-rays with a rich and complicated structure. The planet's polar auroral zones and its disk are powerful sources of x-ray emission. Chandra observations revealed x-ray emission from the Io Plasma Torus and from the Galilean moons Io, Europa, and possibly Ganymede. The emission from these moons is certainly due to bombardment of their surfaces of highly energetic protons, oxygen and sulfur ions from the region near the Torus exciting atoms in their surfaces and leading to fluorescent x-ray emission lines. Although the x-ray emission from the Galilean moons is faint when observed from Earth orbit, an imaging x-ray spectrometer in orbit around these moons, operating at 200 eV and above with 150 eV energy resolution, would provide a detailed mapping (down to 40 m spatial resolution) of the elemental composition in their surfaces. Such maps would provide important constraints on formation and evolution scenarios for the surfaces of these moons. Here we describe the characteristics of X-MIME, an imaging x-ray spectrometer under going a feasibility study for the JIMO mission, with the ultimate goal of providing unprecedented x-ray studies of the elemental composition of the surfaces of Jupiter's icy moons and Io, as well as of Jupiter's auroral x-ray emission.

  12. A highly detailed FEM volume conductor model based on the ICBM152 average head template for EEG source imaging and TCS targeting.

    Science.gov (United States)

    Haufe, Stefan; Huang, Yu; Parra, Lucas C

    2015-08-01

    In electroencephalographic (EEG) source imaging as well as in transcranial current stimulation (TCS), it is common to model the head using either three-shell boundary element (BEM) or more accurate finite element (FEM) volume conductor models. Since building FEMs is computationally demanding and labor intensive, they are often extensively reused as templates even for subjects with mismatching anatomies. BEMs can in principle be used to efficiently build individual volume conductor models; however, the limiting factor for such individualization are the high acquisition costs of structural magnetic resonance images. Here, we build a highly detailed (0.5mm(3) resolution, 6 tissue type segmentation, 231 electrodes) FEM based on the ICBM152 template, a nonlinear average of 152 adult human heads, which we call ICBM-NY. We show that, through more realistic electrical modeling, our model is similarly accurate as individual BEMs. Moreover, through using an unbiased population average, our model is also more accurate than FEMs built from mismatching individual anatomies. Our model is made available in Matlab format.

  13. MRBrainS Challenge : Online Evaluation Framework for Brain Image Segmentation in 3T MRI Scans

    NARCIS (Netherlands)

    Mendrik, Adriënne M.; Vincken, Koen L.; Kuijf, Hugo J.; Breeuwer, Marcel; Bouvy, Willem H.; De Bresser, Jeroen; Alansary, Amir; De Bruijne, Marleen; Carass, Aaron; El-Baz, Ayman; Jog, Amod; Katyal, Ranveer; Khan, Ali R.; Van Der Lijn, Fedde; Mahmood, Qaiser; Mukherjee, Ryan; Van Opbroek, Annegreet; Paneri, Sahil; Pereira, Sérgio; Persson, Mikael; Rajchl, Martin; Sarikaya, Duygu; Smedby, Örjan; Silva, Carlos A.; Vrooman, Henri A.; Vyas, Saurabh; Wang, Chunliang; Zhao, Liang; Biessels, Geert Jan; Viergever, Max A.

    2015-01-01

    Many methods have been proposed for tissue segmentation in brain MRI scans. The multitude of methods proposed complicates the choice of one method above others. We have therefore established the MRBrainS online evaluation framework for evaluating (semi)automatic algorithms that segment gray matter (

  14. MRBrainS Challenge: Online Evaluation Framework for Brain Image Segmentation in 3T MRI Scans

    NARCIS (Netherlands)

    A. Mendrik (Adrienne); K.L. Vincken (Koen); H.J. Kuijf (Hugo J.); M. Breeuwer; W.H. Bouvy (Willem H.); J. de Bresser (Jeroen); A. Alansary (Amir); M. de Bruijne (Marleen); A. Carass (Aaron); A. El-Baz (Ayman); A. Jog (Amod); R. Katyal (Ranveer); A.R. Khan (Ali R.); F. van der Lijn (Fedde); Q. Mahmood (Qaiser); R. Mukherjee (Ryan); A. van Opbroek (Annegreet); S. Paneri (Sahil); S. Pereira (Sérgio); M. Persson (Mikael); M. Rajchl (Martin); D. Sarikaya (Duygu); O. Smedby; C.A. Silva (Carlos A.); H.A. Vrooman (Henri); S. Vyas (Saurabh); C. Wang (Chunliang); L. Zhao (Liang); G.J. Biessels (Geert Jan); M.A. Viergever (Max)

    2015-01-01

    textabstractMany methods have been proposed for tissue segmentation in brain MRI scans. The multitude of methods proposed complicates the choice of one method above others. We have therefore established the MRBrainS online evaluation framework for evaluating (semi)automatic algorithms that segment g

  15. Investigation of optimal display size for viewing T1-weighted MR images of the brain using a digital contrast-detail phantom.

    Science.gov (United States)

    Fujita, Hideki; Kuwahata, Nao; Hattori, Hiroyuki; Kinoshita, Hiroshi; Fukuda, Haruyuki

    2016-01-08

    We clarified the relationship between the display size of MRI images and observer performance using a digital contrast-detail (d-CD) phantom. The d-CD phantom was developed using Microsoft Visual Basic 2010 Express. It had a 512 × 512 matrix in size and a total of 100 holes, whose diameter increased stepwise from 4 to 40 pixels with a 4-pixel interval in the vertical direction; the contrast varied stepwise in the horizontal direction. The digital driving level (DDL) of the back-ground, the width of the DDL, and the contrast were adjustable. These parameters were determined on the basis of the actual T1-weighted magnetic resonance (MR) images of the brain. In this study, the DDL, width, and contrast were set to 85, 20, and 1, respectively. The observer performance study was performed for three different display sizes (30 cm × 30 cm as the enlarged size, 16 cm × 16 cm as the original size, and 10 cm × 10 cm as the reduced size) using a 2-megapixel color liquid crystal display monitor, and it was analyzed using Friedman and Wilcoxon statistical tests. The observer performances for the original display (p sizes (p size, whereas there was no significant difference between the original display and reduced display sizes (p = 0.31). Evaluation with the digital phantom simulating MR imaging also revealed that the original and reduced display sizes were superior to the enlarged display size in observer performance. The d-CD phantom enables a short-term evaluation of observer performance and is useful in analyzing relation-ship between display size and observer performance.

  16. Online monitoring of gas-solid two-phase flow using projected CG method in ECT image reconstruction

    Institute of Scientific and Technical Information of China (English)

    Qi wang; Chengyi Yang; Huaxiang Wang; Ziqiang Cui; Zhentao Gao

    2013-01-01

    Electrical capacitance tomography (ECT) is a promising technique for multi-phase flow measurement due to its high speed,low cost and non-intrusive sensing.Image reconstruction for ECT is an inverse problem of finding the permittivity distribution of an object by measuring the electrical capacitances between sets of electrodes placed around its periphery.The conjugate gradient (CG) method is a popular image reconstruction method for ECT,in spite of its low convergence rate.In this paper,an advanced version of the CG method,the projected CG method,is used for image reconstruction of an ECT system.The solution space is projected into the Krylov subspace and the inverse problem is solved by the CG method in a low-dimensional specific subspace.Both static and dynamic experiments were carried out for gas-solid two-phase flows.The flow regimes are identified using the reconstructed images obtained with the projected CG method.The results obtained indicate that the projected CG method improves the quality of reconstructed images and dramatically reduces computation time,as compared to the traditional sensitivity,Landweber,and CG methods.Furthermore,the projected CG method was also used to estimate the important parameters of the pneumatic conveying process,such as the volume concentration,flow velocity and mass flow rate of the solid phase.Therefore,the projected CG method is considered suitable for online gas-solid two-phase flow measurement.

  17. VizieR Online Data Catalog: mm continuum and line images of G0.253+0.016 (Johnston+, 2014)

    Science.gov (United States)

    Johnston, K. G.; Beuther, H.; Linz, H.; Schmiedeke, A.; Ragan, S. E.; Henning, T.

    2014-06-01

    Observations of G0.253+0.016 were conducted on 9 June 2012 with the SMA in its compact array configuration. The two 4GHz sidebands were placed at 218.9 and 230.9GHz (1.37 and 1.30mm). Observations were also carried out on 16 and 22 October 2012 using the Eight MIxer Receiver (EMIR) installed on the IRAM 30m telescope on Pico Veleta, Spain. We also made use of archival data from the Herschel satellite. FITS images corresponding to Figs. 2, 4, 10 and 11. Figure 2 presents 1.37 and 1.3mm continuum images taken with the Submillimeter Array (SMA). Fig. 4 contains an SMA 1.3mm continuum image combined with a model of the larger-scale 1.3mm continuum emission derived from an 450micron continuum image taken by the Submillimetre Common-User Bolometer Array (SCUBA). Figure 10 displays integrated maps derived from: a combined SMA and IRAM 30m 13CO image cube, and SMA C18O, CH3OH 4(2,2) - 3(1,2)-E, SiO, HNCO and H2CO 3(0,3) - 2(0,2) image cubes. Figure 11 displays the channel maps of the combined SMA and IRAM 30m 13CO image cube mentioned above. Further details of the observations which produced these images are given in Section 2 of the paper. (2 data files).

  18. VizieR Online Data Catalog: Arp 220 LOFAR radio images at 150MHz (Varenius+, 2016)

    Science.gov (United States)

    Varenius, E.; Conway, J. E.; Marti-Vidal, I.; Aalto, S.; Barcos-Munoz, L.; Koenig, S.; Perez-Torres, M. A.; Deller, A. T.; Moldon, J.; Gallagher, J. S.; Yoast-Hull, T. M.; Horellou, C.; Morabito, L. K.; Alberdi, A.; Jackson, N.; Beswick, R.; Carozzi, T. D.; Wucknitz, O.; Ramirez-Olivencia, N.

    2016-07-01

    The 1.4GHz FITS image was obtained by combining data from the Very Large Array (VLA) and the Multi-Element Radio Linked Interferometer Network (MERLIN) arrays. The 150MHz image was obtained from data taken by the International LOFAR telescope, and image using the Multi-Frequency-Synthesis algorithm as implemented in the task CLEAN in CASA 4.5.2 using 2 Taylor terms, which also produced a spectral index map and a spectral index error map. These two FITS images are also included in addition to the continuum image. Using these four FITS images, as well as the CO(1-0) and CO(2-1) maps in Konig et al. (2012ApJ...754...58K) and 6GHz and 33GHz images in Barcos-Munoz et al. (2015. Cat. J/ApJ/799/10), it is possible to reproduce the figures in the paper. (2 data files).

  19. Online advertising by three commercial breast imaging services: message takeout and effectiveness.

    Science.gov (United States)

    Johnson, Rebecca; Jalleh, Geoffrey; Pratt, Iain S; Donovan, Robert J; Lin, Chad; Saunders, Christobel; Slevin, Terry

    2013-10-01

    Mammography is widely acknowledged to be the most cost-effective technique for population screening for breast cancer. Recently in Australia, imaging modalities other than mammography, including thermography, electrical impedance, and computerised breast imaging, have been increasingly promoted as alternative methods of breast cancer screening. This study assessed the impact of three commercial breast imaging companies' promotional material upon consumers' beliefs about the effectiveness of the companies' technology in detecting breast cancer, and consumers' intentions to seek more information or consider having their breasts imaged by these modalities. Results showed 90% of respondents agreed that the companies' promotional material promoted the message that the advertised breast imaging method was effective in detecting breast cancer, and 80% agreed that the material promoted the message that the imaging method was equally or more effective than a mammogram. These findings have implications for women's preference for and uptake of alternative breast imaging services over mammography. Copyright © 2013 Elsevier Ltd. All rights reserved.

  20. Investigation of feedback on neutron kinetics and thermal hydraulics from detailed online fuel behavior modeling during a boron dilution transient in a PWR with the two-way coupled code system DYN3D-TRANSURANUS

    Energy Technology Data Exchange (ETDEWEB)

    Holt, L., E-mail: lars.holt@tuev-sued.de [TÜV SÜD Energietechnik GmbH Baden-Württemberg, Gottlieb-Daimler-Str. 7, 70794 Filderstadt (Germany); Technical University München, Department of Nuclear Engineering, Boltzmannstr. 15, D-85748 Garching bei München (Germany); Rohde, U.; Kliem, S.; Baier, S. [Helmholtz-Zentrum Dresden—Rossendorf, Reactor Safety Division, PO Box 510119, D-01314 Dresden (Germany); Seidl, M. [E.ON Kernkraft GmbH, Tresckowstr. 5, D-30457 Hannover (Germany); Van Uffelen, P. [European Commission, Joint Research Centre, Institute for Transuranium Elements, Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen (Germany); Macián-Juan, R. [Technical University München, Department of Nuclear Engineering, Boltzmannstr. 15, D-85748 Garching bei München (Germany)

    2016-02-15

    Highlights: • General coupling interface was developed for the fuel performance code TRANSURANUS. • With this new tool simplified fuel behavior models in codes can be replaced. • The reactor dynamics code DYN3D was coupled to TRANSURANUS at assembly level. • The feedback from detailed online fuel behavior modeling is analyzed for reactivity initiated accident (RIA). • The thermal hydraulics can be affected strongly even in fresh fuel assemblies. - Abstract: Recently the reactor dynamics code DYN3D (including an internal fuel behavior model) was coupled to the fuel performance code TRANSURANUS at assembly level. The coupled code system applies the new general TRANSURANUS coupling interface, hence it can be used for one-way or two-way coupling. In the coupling, DYN3D provides process time, time-dependent rod power and thermal hydraulics conditions to TRANSURANUS, which in case of the two-way coupling approach replaces completely the internal DYN3D fuel behavior model and transfers parameters like radial fuel temperature distribution and cladding temperature back to DYN3D. For the first time results of the coupled code system are presented for a post-critical-heat-flux heat transfer. The corresponding heat transfer regime is mostly film boiling, where the cladding temperature can rise several hundreds of degrees. The simulated boron dilution transient assumed an injection of a 36 m{sup 3} slug of under-borated coolant into a German pressurized water reactor (PWR) core initiated from a sub-critical reactor state (extreme reactivity initiated accident (RIA) conditions). The feedback from detailed fuel behavior modeling was found negligible on the neutron kinetics and thermal hydraulics during the first power rise. In a later phase of the transient, the node injected energy can differ 25 J/g, even still around 20 J/g for nodes without film boiling. Furthermore, the thermal hydraulics can be affected strongly even in fresh fuel assemblies, where film boiling

  1. Detailed Debunking of Denial

    Science.gov (United States)

    Enting, I. G.; Abraham, J. P.

    2012-12-01

    The disinformation campaign against climate science has been compared to a guerilla war whose tactics undermine the traditional checks and balances of science. One comprehensive approach has to been produce archives of generic responses such as the websites of RealClimate and SkepticalScience. We review our experiences with an alternative approach of detailed responses to a small number of high profile cases. Our particular examples were Professor Ian Plimer and Christopher Monckton, the Third Viscount Monckton of Brenchley, each of whom has been taken seriously by political leaders in our respective countries. We relate our experiences to comparable examples such as John Mashey's analysis of the Wegman report and the formal complaints about Lomborg's "Skeptical Environmentalist" and Durkin's "Great Global Warming Swindle". Our two approaches used contrasting approaches: an on-line video of a lecture vs an evolving compendium of misrepresentations. Additionally our approaches differed in the emphasis. The analysis of Monckton concentrated on the misrepresentation of the science, while the analysis of Plimer concentrated on departures from accepted scientific practice: fabrication of data, misrepresentation of cited sources and unattributed use of the work of others. Benefits of an evolving compendium were the ability to incorporate contributions from members of the public who had identified additional errors and the scope for addressing new aspects as they came to public attention. `Detailed debunking' gives non-specialists a reference point for distinguishing non-science when engaging in public debate.

  2. Detecting the Online Image of “Average” Restaurants on TripAdvisor

    OpenAIRE

    Hrvoje Jakopović

    2016-01-01

    Collective intelligence can be interpreted as the actions of individuals that provide collective effects. In online spaces, the more user comments about a matter of discussion, the higher the potential that certain repeated points of view will be used as a story frame. This observation can be a very useful explanation for the value of user comments, reviews and the ratings in the field of public relations. Nowadays, it has become noticeable that many indecisive people who are thinking of buyi...

  3. Main: Clone Detail [KOME

    Lifescience Database Archive (English)

    Full Text Available Clone Detail Mapping Pseudomolecule data detail Detail information Mapping to the TIGR japonica Pseudomolecu...les kome_mapping_pseudomolecule_data_detail.zip kome_mapping_pseudomolecule_data_detail ...

  4. Group-based single image super-resolution with online dictionary learning

    Science.gov (United States)

    Lu, Xuan; Wang, Dingwen; Shi, Wenxuan; Deng, Dexiang

    2016-12-01

    Recently, sparse representation has been successfully used in single image super-resolution reconstruction. Unlike the traditional single image super-resolution methods such as image interpolation, the super-resolution with sparse representation reconstructs image with one or several constant dictionaries learned from external databases. However, the contents can vary significantly across different patches in a single image, and the fixed dictionaries cannot suit for every patch. This paper presents a novel approach for single image super-resolution based on sparse representation, which uses group as the basic unit, and trains dictionary with external database and the input low-resolution image itself for each group to ensure that the dictionary is suitable for the patches in the group. Simultaneous sparse coding algorithm is used to accelerate the processing and improve the result. Extensive experiments on natural images show that our method achieves better results than some state-of-the-art algorithms in terms of both objective and human visual evaluations.

  5. VizieR Online Data Catalog: eta Car velocity-resolved imaging (Weigelt+, 2016)

    Science.gov (United States)

    Weigelt, G.; Hofmann, K.-H.; Schertl, D.; Clementel, N.; Corcoran, M. F.; Damineli, A.; de Wit, W.-J.; Grellmann, R.; Groh, J.; Guieu, S.; Gull, T.; Heininger, M.; Hillier, D. J.; Hummel, C. A.; Kraus, S.; Madura, T.; Mehner, A.; Merand, A.; Millour, F.; Moffat, A. F. J.; Ohnaka, K.; Patru, F.; Petrov, R. G.; Rengaswamy, S.; Richardson, N. D.; Rivinius, T.; Schoeller, M.; Teodoro, M.; Wittkowski, M.

    2016-09-01

    We present the reconstructed images from Fig. 4 of the paper. The interferometric data were taken with the ESO VLTI and the AMBER instrument with high spectral resolution (R=12000) in many spectral channels across the Brackett Gamma line at 2.166 micron. 96 images were reconstructed at velocity channels from -663km/s to 520km/s. The velocity of each channel is coded into the filename. Plate scale is 0.781mas/pixel. North is up, and east to the left. FOV is 50mas. The resolution of the images is ~6 mas. (2 data files).

  6. Public foetal images and the regulation of middle-class pregnancy in the online media: a view from South Africa.

    Science.gov (United States)

    Macleod, Catriona; Howell, Simon

    2015-01-01

    Ultrasonography images and their derivatives have been taken up in a range of 'public' spaces, including medical textbooks, the media, anti-abortion material, advertising, the Internet and public health facilities. Feminists have critiqued the personification of the foetus, the bifurcation of the woman's body and the reduction of the pregnant woman to a disembodied womb. What has received less attention is how these images frequently intersect with race, class, gender and heteronormativity in the creation of idealised and normative understandings of pregnancy. This paper focuses on the discursive positioning of pregnant women as 'mothers' and foetuses as 'babies' in online media targeted at a South African audience, where race and class continue to intersect in complex ways. We show how the ontologically specific understandings of 'mummies' and 'babies' emerge through the use of foetal images to construct specific understandings of the 'ideal' pregnancy. In the process, pregnant women are made responsible for ensuring that their pregnancy conforms to these ideals, which includes the purchasing of the various goods advertised by the websites. Not only does this point to a commodification of pregnancy, but also serves to reinforce a cultural understanding of White, middle-class pregnancy as constituting the normative 'correct' form of pregnancy.

  7. SarcOptiM for ImageJ: high-frequency online sarcomere length computing on stimulated cardiomyocytes.

    Science.gov (United States)

    Pasqualin, Côme; Gannier, François; Yu, Angèle; Malécot, Claire O; Bredeloux, Pierre; Maupoil, Véronique

    2016-08-01

    Accurate measurement of cardiomyocyte contraction is a critical issue for scientists working on cardiac physiology and physiopathology of diseases implying contraction impairment. Cardiomyocytes contraction can be quantified by measuring sarcomere length, but few tools are available for this, and none is freely distributed. We developed a plug-in (SarcOptiM) for the ImageJ/Fiji image analysis platform developed by the National Institutes of Health. SarcOptiM computes sarcomere length via fast Fourier transform analysis of video frames captured or displayed in ImageJ and thus is not tied to a dedicated video camera. It can work in real time or offline, the latter overcoming rotating motion or displacement-related artifacts. SarcOptiM includes a simulator and video generator of cardiomyocyte contraction. Acquisition parameters, such as pixel size and camera frame rate, were tested with both experimental recordings of rat ventricular cardiomyocytes and synthetic videos. It is freely distributed, and its source code is available. It works under Windows, Mac, or Linux operating systems. The camera speed is the limiting factor, since the algorithm can compute online sarcomere shortening at frame rates >10 kHz. In conclusion, SarcOptiM is a free and validated user-friendly tool for studying cardiomyocyte contraction in all species, including human.

  8. WE-AB-BRA-09: Sensitivity of Plan Re-Optimization to Errors in Deformable Image Registration in Online Adaptive Image-Guided Radiation Therapy

    Energy Technology Data Exchange (ETDEWEB)

    McClain, B; Olsen, J; Green, O; Yang, D; Santanam, L; Olsen, L; Zhao, T; Rodriguez, V; Wooten, H; Mutic, S; Kashani, R [Washington University School of Medicine, St. Louis, Missouri (United States); Victoria, J; Dempsey, J [ViewRay Incorporated, Oakwood Village, OH (United States)

    2015-06-15

    Purpose: Online adaptive therapy (ART) relies on auto-contouring using deformable image registration (DIR). DIR’s inherent uncertainties require user intervention and manual edits while the patient is on the table. We investigated the dosimetric impact of DIR errors on the quality of re-optimized plans, and used the findings to establish regions for focusing manual edits to where DIR errors can Result in clinically relevant dose differences. Methods: Our clinical implementation of online adaptive MR-IGRT involves using DIR to transfer contours from CT to daily MR, followed by a physicians’ edits. The plan is then re-optimized to meet the organs at risk (OARs) constraints. Re-optimized abdomen and pelvis plans generated based on physician edited OARs were selected as the baseline for evaluation. Plans were then re-optimized on auto-deformed contours with manual edits limited to pre-defined uniform rings (0 to 5cm) around the PTV. A 0cm ring indicates that the auto-deformed OARs were used without editing. The magnitude of the variations caused by the non-deterministic optimizer was quantified by repeat re-optimizations on the same geometry to determine the mean and standard deviation (STD). For each re-optimized plan, various volumetric parameters for the PTV, the OARs were extracted along with DVH and isodose evaluation. A plan was deemed acceptable if the variation from the baseline plan was within one STD. Results: Initial results show that for abdomen and pancreas cases, a minimum of 5cm margin around the PTV is required for contour corrections, while for pelvic and liver cases a 2–3 cm margin is sufficient. Conclusion: Focusing manual contour edits to regions of dosimetric relevance can reduce contouring time in the online ART process while maintaining a clinically comparable plan. Future work will further refine the contouring region by evaluating the path along the beams, dose gradients near the target and OAR dose metrics.

  9. On-line MR imaging for dose validation of abdominal radiotherapy

    NARCIS (Netherlands)

    Glitzner, M; Crijns, S P M; de Senneville, B Denis; Kontaxis, C; Prins, F M; Lagendijk, J J W; Raaymakers, B W

    2015-01-01

    For quality assurance and adaptive radiotherapy, validation of the actual delivered dose is crucial.Intrafractional anatomy changes cannot be captured satisfactorily during treatment with hitherto available imaging modalitites. Consequently, dose calculations are based on the assumption of static an

  10. VizieR Online Data Catalog: NGC 5523 H-band image (Fulmer+, 2017)

    Science.gov (United States)

    Fulmer, L. M.; Gallagher, J. S. Iii; Kotulla, R.

    2016-10-01

    ngc5523ellipseanalysis.fits (ellipse Output file from the Ellipse analysis described in Tables 2 and 3 and shown in Figure 1(c). Contents for each column may be found at http://stsdas.stsci.edu/cgi-bin/gethelp.cgi?ellipse. The input image for this analysis was a sky-subtracted 3.6-micron Spitzer Space Telescope image of NGC 5523 with a sky value of 0.03. Tables 2 and 3 outline the initial parameters of the Ellipse analysis. ngc5523smaobservedmag.fits (smamag.dat): Data used to make Figure 3, "Observed Magnitude vs. SMA for the inner and outer disks of NGC 5523", based on the Ellipse analysis shown in Figure 1(c). The first three columns (row, SMA, MAG) come directly from the Ellipse analysis output, found in ngc5523ellipseanalysis.fits. The fourth column (OBS_MAG) contains the observed magnitude of NGC 5523 at increasingly large sma, calculated by adding 18.89 to column three (MAG). 18.89 is the conversion factor from absolute magnitude to observed magnitude, based on the distance 20.6Mpc to NGC 5523. ngc5523coloranalysis.fits (color.dat): In performing the color analysis, Ellipse fits were obtained for SDSS g and r images, then colors were calculated as the difference between the g and r AB magnitudes from their respective Ellipse fits. The file ngc5523coloranalysis.fits contains both the Ellipse analysis for the SDSS g image, as well as the (g-r) color analysis. Contents for each column may be found at http://stsdas.stsci.edu/cgi-bin/gethelp.cgi?ellipse. The last column, entitled '(g-r)' contains the color analysis data. ngc5523smagrcolor.fits (smacolor.dat): Data used to make Figure 4, "Color analysis of NGC 5523 from SDSS (g-r) images". The first three columns (row, SMAarcsecg, (g-r)) come directly from the Ellipse and color analyses of SDSS g and r images, found in ngc5523coloranalysis.fits. The fourth column (sma_kpc) contains the conversion of the SMA of NGC 5523 from arcsec to kpc, based on the distance 20.6Mpc. Archival images: Sky-subtracted Spitzer Space

  11. Dosimetric and geometric evaluation of a hybrid strategy of offline adaptive planning and online image guidance for prostate cancer radiotherapy

    Energy Technology Data Exchange (ETDEWEB)

    Liu Han; Wu Qiuwen, E-mail: Qiuwen.Wu@Duke.edu [Department of Radiation Oncology, Duke University Medical Center, Durham, NC 27710 (United States)

    2011-08-07

    For prostate cancer patients, online image-guided (IG) radiotherapy has been widely used in clinic to correct the translational inter-fractional motion at each treatment fraction. For uncertainties that cannot be corrected online, such as rotation and deformation of the target volume, margins are still required to be added to the clinical target volume (CTV) for the treatment planning. Offline adaptive radiotherapy has been implemented to optimize the treatment for each individual patient based on the measurements at early stages of treatment process. It has been shown that offline adaptive radiotherapy can effectively reduce the required margin. Recently a hybrid strategy of offline adaptive replanning and online IG was proposed and the geometric evaluation was performed. It was found that the planning margins can further be reduced by 1-2 mm compared to online IG only strategy. The purpose of this study was to investigate the dosimetric benefits of such a hybrid strategy on the target and organs at risk. A total of 420 repeated helical computed tomography scans from 28 patients were included in the study. Both low-risk patients (LRP, CTV = prostate) and intermediate-risk patients (IRP, CTV = prostate + seminal vesicles, SV) were included in the simulation. Two registration methods, based on center-of-mass shift of prostate only and prostate plus SV, were performed for IRP. The intensity-modulated radiotherapy was used in the simulation. Criteria on both cumulative and fractional doses were evaluated. Furthermore, the geometric evaluation was extended to investigate the optimal number of fractions necessary to construct the internal target volume (ITV) for the hybrid strategy. The dosimetric margin improvement was smaller than its geometric counterpart and was in the range of 0-1 mm. The optimal number of fractions necessary for the ITV construction is 2 for LRPs and 3-4 for IRPs in a hypofractionation protocol. A new cumulative index of target volume was proposed

  12. Dosimetric and geometric evaluation of a hybrid strategy of offline adaptive planning and online image guidance for prostate cancer radiotherapy

    Science.gov (United States)

    Liu, Han; Wu, Qiuwen

    2011-08-01

    For prostate cancer patients, online image-guided (IG) radiotherapy has been widely used in clinic to correct the translational inter-fractional motion at each treatment fraction. For uncertainties that cannot be corrected online, such as rotation and deformation of the target volume, margins are still required to be added to the clinical target volume (CTV) for the treatment planning. Offline adaptive radiotherapy has been implemented to optimize the treatment for each individual patient based on the measurements at early stages of treatment process. It has been shown that offline adaptive radiotherapy can effectively reduce the required margin. Recently a hybrid strategy of offline adaptive replanning and online IG was proposed and the geometric evaluation was performed. It was found that the planning margins can further be reduced by 1-2 mm compared to online IG only strategy. The purpose of this study was to investigate the dosimetric benefits of such a hybrid strategy on the target and organs at risk. A total of 420 repeated helical computed tomography scans from 28 patients were included in the study. Both low-risk patients (LRP, CTV = prostate) and intermediate-risk patients (IRP, CTV = prostate + seminal vesicles, SV) were included in the simulation. Two registration methods, based on center-of-mass shift of prostate only and prostate plus SV, were performed for IRP. The intensity-modulated radiotherapy was used in the simulation. Criteria on both cumulative and fractional doses were evaluated. Furthermore, the geometric evaluation was extended to investigate the optimal number of fractions necessary to construct the internal target volume (ITV) for the hybrid strategy. The dosimetric margin improvement was smaller than its geometric counterpart and was in the range of 0-1 mm. The optimal number of fractions necessary for the ITV construction is 2 for LRPs and 3-4 for IRPs in a hypofractionation protocol. A new cumulative index of target volume was proposed

  13. High Resolution Seismic Survey off the Pacific Shore of Costa Rica - Detailed Imaging of Deformational Patterns, Fluid Venting and Carbonate Mounds

    Science.gov (United States)

    Fekete, N.; Spiess, V.; Heidersdorf, F.; v. Lom, H.; Zuehlsdorff, L.; Denil, D.; Huguen, C.; Schnabel, M.

    2003-04-01

    R/V METEOR Research Cruise M54/1 in summer 2002 from Balboa (Panama) to Caldera (Costa Rica) aimed at imaging the near sea floor sedimentary structures of both the continental and oceanic plates of the Costa Rican Subduction Zone with the high resolution seismic method. The cruise evolved from a cooperation of the Marine Seismics Group of the University of Bremen with the DFG funded Special Research Project 574 - Fluids and Volatiles in Subduction Zones - and is intended to supplement the marine geophysical, geological and geochemical as well as oceanographic data collected during R/V SONNE cruises in the area, as well as subsequent R/V METEOR cruises M54/2 and /3. The objectives of SFB 574 are the investigation of shallow and deep processes in subduction zones through near surface sampling of fluid vent sites and gas hydrate occurrences, as well as through detailed seismic and acoustic imaging of related structures. The main objectives of the cruise were to study 1) the volatile and material input into the sedimentary system on the oceanic plate, 2) the distribution of gas hydrates within the sediments, and 3) possible pathways and resulting structures of fluid/gas escape. Several working areas were selected, which had been identified as highly fractured sediment packages above subducting seamounts (Jaco Scar, Parrita Scar, Rio Bongo, Hongo area), areas of pronounced decollement reflection, major slump masses (Nicoya slide), regions of major fracturing of the oceanic crust, or carbonate mounds (Hongo area, Mound Culebra) during previous cruises. For calibration of seismic data, survey lines were also shot in the vicinity of ODP Leg 170 drill sites. Several seismic examples from various survey sites will be shown. Closely spaced profiles, allowing the acquisition of 3D and 2.5D seismic data in the Hongo area and near Mound Culebra, respectively, reveal the complex internal structure of fluid pathways, the distribution of gas hydrates, and the tectonic framework of

  14. Detailing the relation between renal T2* and renal tissue pO2 using an integrated approach of parametric magnetic resonance imaging and invasive physiological measurements.

    Science.gov (United States)

    Pohlmann, Andreas; Arakelyan, Karen; Hentschel, Jan; Cantow, Kathleen; Flemming, Bert; Ladwig, Mechthild; Waiczies, Sonia; Seeliger, Erdmann; Niendorf, Thoralf

    2014-08-01

    This study was designed to detail the relation between renal T2* and renal tissue pO2 using an integrated approach that combines parametric magnetic resonance imaging (MRI) and quantitative physiological measurements (MR-PHYSIOL). Experiments were performed in 21 male Wistar rats. In vivo modulation of renal hemodynamics and oxygenation was achieved by brief periods of aortic occlusion, hypoxia, and hyperoxia. Renal perfusion pressure (RPP), renal blood flow (RBF), local cortical and medullary tissue pO2, and blood flux were simultaneously recorded together with T2*, T2 mapping, and magnetic resonance-based kidney size measurements (MR-PHYSIOL). Magnetic resonance imaging was carried out on a 9.4-T small-animal magnetic resonance system. Relative changes in the invasive quantitative parameters were correlated with relative changes in the parameters derived from MRI using Spearman analysis and Pearson analysis. Changes in T2* qualitatively reflected tissue pO2 changes induced by the interventions. T2* versus pO2 Spearman rank correlations were significant for all interventions, yet quantitative translation of T2*/pO2 correlations obtained for one intervention to another intervention proved not appropriate. The closest T2*/pO2 correlation was found for hypoxia and recovery. The interlayer comparison revealed closest T2*/pO2 correlations for the outer medulla and showed that extrapolation of results obtained for one renal layer to other renal layers must be made with due caution. For T2* to RBF relation, significant Spearman correlations were deduced for all renal layers and for all interventions. T2*/RBF correlations for the cortex and outer medulla were even superior to those between T2* and tissue pO2. The closest T2*/RBF correlation occurred during hypoxia and recovery. Close correlations were observed between T2* and kidney size during hypoxia and recovery and for occlusion and recovery. In both cases, kidney size correlated well with renal vascular conductance

  15. Detailed imaging of the normal anatomy and pathologic conditions of the cavernous region at 3 Tesla using a contrast-enhanced MR angiography

    Energy Technology Data Exchange (ETDEWEB)

    Linn, Jennifer; Peters, Friederike; Lummel, Nina; Brueckmann, Hartmut; Yousry, Indra [University Hospital Munich, Department of Neuroradiology, Munich (Germany); Schankin, Christoph [University Hospital Munich, Department of Neurology, Munich (Germany); Rachinger, Walter [University Hospital Munich, Department of Neurosurgery, Munich (Germany)

    2011-12-15

    The purpose of this study was to evaluate the potential of a high-resolution contrast-enhanced magnetic resonance angiography (CE-MRA) at 3 Tesla for the delineation of the cavernous sinus (CS) anatomy both under normal and under pathological conditions. Fifteen patients without pathologies in the CS and ten patients with pituitary adenomas were included. The CE-MRA was performed on a 3-Tesla scanner and analyzed collaboratively by two readers. The cranial nerves (CNs) within the CS, namely CNIII, CNIV, CNV1, CNV2, and CNVI, were identified in both patient groups. In the adenoma patients it was also assessed whether and to which extend the adenoma invaded the CS and the spatial relationship between tumor and CNs was determined. In the patients with normal CS anatomy, CNIII could be identified in 100%, CNIV in 86.7%, and CNV1, CNV2, as well as CNVI in 100% of analyzed sides. Pituitary adenomas invaded the CS unilaterally (right side) in four patients, and bilaterally in six patients. In patients with adenomas, the CN could be identified and differentiated from the tumor in the following percentages: CNIII in 100%, CNIV in 70%, both CNV1 and CNV2 in 90%, and CNVI in 100%. In all these cases, the tumor-nerve spatial relationship could be visualized. 3-Tesla CE-MRA allows detailed imaging of the complex anatomy of the CS and its structures. In adenoma patients, it clearly visualizes the spatial relationship between tumor and CNs, and thus might be helpful to optimize presurgical planning. (orig.)

  16. Magnetic resonance imaging reveals detailed spatial and temporal distribution of iron-based nanoparticles transported through water-saturated porous media

    Science.gov (United States)

    Cuny, Laure; Herrling, Maria Pia; Guthausen, Gisela; Horn, Harald; Delay, Markus

    2015-11-01

    The application of engineered nanoparticles (ENP) such as iron-based ENP in environmental systems or in the human body inevitably raises the question of their mobility. This also includes aspects of product optimization and assessment of their environmental fate. Therefore, the key aim was to investigate the mobility of iron-based ENP in water-saturated porous media. Laboratory-scale transport experiments were conducted using columns packed with quartz sand as model solid phase. Different superparamagnetic iron oxide nanoparticles (SPION) were selected to study the influence of primary particle size (dP = 20 nm and 80 nm) and surface functionalization (plain, -COOH and -NH2 groups) on particle mobility. In particular, the influence of natural organic matter (NOM) on the transport and retention behaviour of SPION was investigated. In our approach, a combination of conventional breakthrough curve (BTC) analysis and magnetic resonance imaging (MRI) to non-invasively and non-destructively visualize the SPION inside the column was applied. Particle surface properties (surface functionalization and resulting zeta potential) had a major influence while their primary particle size turned out to be less relevant. In particular, the mobility of SPION was significantly increased in the presence of NOM due to the sorption of NOM onto the particle surface resulting in a more negative zeta potential. MRI provided detailed spatially resolved information complementary to the quantitative BTC results. The approach can be transferred to other porous systems and contributes to a better understanding of particle transport in environmental porous media and porous media in technical applications.

  17. Online Image-based Monitoring of Soft-tissue Displacements for Radiation Therapy of the Prostate

    Energy Technology Data Exchange (ETDEWEB)

    Schlosser, Jeffrey [Department of Mechanical Engineering, Stanford University, Stanford, CA (United States); Department of Bioengineering, Stanford University, Stanford, CA (United States); Salisbury, Kenneth [Department of Computer Science, Stanford University, Stanford, CA (United States); Department of Surgery, Stanford University, Stanford, CA (United States); Hristov, Dimitre, E-mail: dhristov@stanford.edu [Department of Radiation Oncology, Stanford University, Stanford, CA (United States)

    2012-08-01

    Purpose: Emerging prolonged, hypofractionated radiotherapy regimens rely on high-dose conformality to minimize toxicity and thus can benefit from image guidance systems that continuously monitor target position during beam delivery. To address this need we previously developed, as a potential add-on device for existing linear accelerators, a novel telerobotic ultrasound system capable of real-time, soft-tissue imaging. Expanding on this capability, the aim of this work was to develop and characterize an image-based technique for real-time detection of prostate displacements. Methods and Materials: Image processing techniques were implemented on spatially localized ultrasound images to generate two parameters representing prostate displacements in real time. In a phantom and five volunteers, soft-tissue targets were continuously imaged with a customized robotic manipulator while recording the two tissue displacement parameters (TDPs). Variations of the TDPs in the absence of tissue displacements were evaluated, as was the sensitivity of the TDPs to prostate translations and rotations. Robustness of the approach to probe force was also investigated. Results: With 95% confidence, the proposed method detected in vivo prostate displacements before they exceeded 2.3, 2.5, and 2.8 mm in anteroposterior, superoinferior, and mediolateral directions. Prostate pitch was detected before exceeding 4.7 Degree-Sign at 95% confidence. Total system time lag averaged 173 ms, mostly limited by ultrasound acquisition rate. False positives (FPs) (FP) in the absence of displacements did not exceed 1.5 FP events per 10 min of continuous in vivo imaging time. Conclusions: The feasibility of using telerobotic ultrasound for real-time, soft-tissue-based monitoring of target displacements was confirmed in vivo. Such monitoring has the potential to detect small clinically relevant intrafractional variations of the prostate position during beam delivery.

  18. VizieR Online Data Catalog: Imaging and spectroscopy in Lynx W (Jorgensen+, 2014)

    Science.gov (United States)

    Jorgensen, I.; Chiboucas, K.; Toft, S.; Bergmann, M.; Zirm, A.; Schiavon, R. P.; Grutzbauch, R.

    2017-01-01

    Ground-based imaging of RX J0848.6+4453 was obtained primarily to show the performance gain provided by replacing the original E2V charge-coupled devices (E2V CCDs) in Gemini Multi-Object Spectrograph on Gemini North (GMOS-N) with E2V Deep Depletion CCDs (E2V DD CCDs). This replacement was done in 2011 October. Imaging of RX J0848.6+4453 was obtained with the original E2V CCDs in 2011 October (UT 2011 Oct 1 to 2011 Oct 2; Program ID: GN-2011B-DD-3) and repeated with the E2V DD CCDs in 2011 November. The imaging was done in the z' filter. For the observations with the original E2V CCDs the total exposure time was 60 minutes (obtained as 12 five-minute exposures) and the co-added image had an image quality of FWHM=0.52'' measured from point sources in the field. For the E2V DD CCDs a total exposure time of 55 minutes was obtained and the resulting image quality was FWHM=0.51''. Imaging of RX J0848.6+4453 was also obtained with Hubble Space Telescope /Advanced Camera for Surveys (HST/ACS using the filters F775W and F850LP) under the program ID 9919. The spectroscopic observations were obtained in multi-object spectroscopic (MOS) mode with GMOS-N (UT 2011 Nov 24 to 2012 Jan 4, Program ID: GN-2011B-DD-5; UT 2013 Mar 9 to 2013 May 18, Program ID: GN-2013A-Q-65). Table10 lists the photometric parameters for the spectroscopic sample as derived from the HST/ACS observations in F850LP and F775W. Tables 11 and 12 list the results from the template fitting and the derived line strengths, respectively. (3 data files).

  19. VizieR Online Data Catalog: Near-infrared imaging polarimetry of GGD 27 (Kwon+, 2016)

    Science.gov (United States)

    Kwon, J.; Tamura, M.; Hough, J. H.; Nagata, T.; Kusakabe, N.; Saito, H.

    2016-08-01

    Observations in the direction of GGD 27 IRS were carried out using the SIRPOL imaging polarimeter at the Infrared Survey Facility (IRSF) 1.4m telescope at SAAO in South Africa. The Facility enables deep wide-field (7.7'x7.7' at a scale of 0.453"/pixel) simultaneous imaging polarimetry in the JHKs bands. Linear polarimetry was performed on the night of 2006 March 14. Circular polarimetry observations of the GGD 27 IRS regions were made on the nights of 2008 July 24 and 2014 March 21. (2 data files).

  20. A new field-of-view autotracking method based on back-projected ray image cross-correlation for online tomography reconstruction.

    Science.gov (United States)

    Tomonaga, Sachihiko; Baba, Misuzu; Baba, Norio

    2014-11-01

    In general, a tomogram cannot be observed immediately after the acquisition of a series of specimen tilt images, but is instead observed after the post-processing of the tilt series alignment, which often requires a substantial amount of time. Moreover, for general specimens, the automatic acquisition of the tilt series is difficult because field-of-view tracking frequently fails as the tilt angle or specimen thickness increases.In this study, we focus on the improvement of the field-of-view autotracking technique for the purpose of online tomography reconstruction and propose a new alternative technique [1,2]. The method we proposed uses a so-called 'back-projected ray image' instead of a specimen tilt image. The back-projected ray image is a cross-section image calculated from each projection image only during reconstruction. As a result of a study on 'ray images', the quality and accuracy of the cross-correlation between a pair of neighboring ray images among the tilt series were observed to be very high compared with those between a pair of projection images. We observed that a back projected ray image reliably cross-correlates with other neighboring ray images at the position of an existing three-dimensional object. The proposed method can therefore consistently track the field-of-view, overcoming the weakness of a conventional image-matching-based method. In addition, the present method is simple, and high speed processing is expected to be achieved because fast Fourier transform (FFT) and inverse fast Fourier transform (IFFT) algorithms can be used.We applied this method to real specimens in online experiments using a TEM and thereby demonstrated its successful performance. Online autotracking experiments with thin-section samples were used to demonstrate the effectiveness of the proposed method. The field-of-view was automatically tracked with high accuracy through a tilt angle range. Furthermore, online tomograms were obtained immediately after the last

  1. Development of a Hyperspectral Imaging System for Online Quality Inspection of Pickling Cucumbers

    Science.gov (United States)

    This paper reports on the development of a hyperspectral imaging prototype for evaluation of external and internal quality of pickling cucumbers. The prototype consisted of a two-lane round belt conveyor, two illumination sources (one for reflectance and one for transmittance), and a hyperspectral i...

  2. Online Learning a Binary Classifier for Improving Go ogle Image Search Results

    Institute of Scientific and Technical Information of China (English)

    WAN Yu-Chai; LIU Xia-Bi; HAN Fei-Fei; TONG Kun-Qi; LIU Yu

    2014-01-01

    It is promising to improve web image search results through exploiting the results0 visual contents for learning a binary classifier which is used to refine the results0 relevance degrees to the given query. This paper proposes an algorithm framework as a solution to this problem and investigates the key issue of training data selection under the framework. The training data selection process is divided into two stages: initial selection for triggering the classifier learning and dynamic selection in the iterations of classifier learning. We investigate two main ways of initial training data selection, including clustering based and ranking based, and compare automatic training data selection schemes with manual manner. Furthermore, support vector machines and the max-min pseudo-probability (MMP) based Bayesian classifier are employed to support image classification, respectively. By varying these factors in the framework, we implement eight algorithms and tested them on keyword based image search results from Google search engine. The experimental results confirm that how to select the training data from noisy search results is really a key issue in the problem considered in this paper and show that the proposed algorithm is effective to improve Google search results, especially at top ranks, thus is helpful to reduce the user labor in finding the desired images by browsing the ranking in depth. Even so, it is still worth meditative to make automatic training data selection scheme better towards perfect human annotation.

  3. VizieR Online Data Catalog: Malin 1 images at 6 wavelengths (Boissier+, 2016)

    Science.gov (United States)

    Boissier, S.; Boselli, A.; Ferrarese, L.; Cote, P.; Roehlly, Y.; Gwyn, S. D. J.; Cuillandre, J.-C.; Roediger, J.; Koda, J.; Munos Mateos, J. C.; Gil de, Paz A.; Madore, B. F.

    2016-10-01

    Six images of Malin 1 are provided in fits format, using the same pixel scale. The original data are taken from the GUViCS and NGVS surveys. Units and calibration are kept as in the standard products from these survey (i.e. GALEX FUV and NUV, and CFHT MegaCam u, g, i z. (2 data files).

  4. Building the Government Image from the Perspective of Online Public Relations%网络公共关系视角下的政府形象塑造

    Institute of Scientific and Technical Information of China (English)

    翟年祥; 张炜婕

    2014-01-01

    With the rapid development of informatization and e-government affairs, the online government public relation (PR) becomes a significant method to administrate national affairs for the government. At first, this paper introduces the definition and features of the online government PR. Then, it illustrates the meanings of online government PRs to three aspects: building efficient government image, service-oriented government image, and democratic government image. Subsequently, it analyzes the three general problems existing in current online government PR going against building the government image: formalism, improper resolutions to crisis incidents, and unclear functional orientation. At last, it raises four approaches to maintain the government image based on improving online PRs.%政府网络公关对于塑造高效政府形象、服务型政府形象和民主政府形象具有重要意义;当前我国政府网络公关存在形式主义、危机事件处理不当以及功能定位模糊等问题,不利于政府形象的塑造;应将政府网络公关纳入制度化、正规化的轨道,加强政府公关人才队伍建设,使政府网络公关工作更加专业化,建立有效的公共危机政府网络公关处理预案,进一步加强电子政务的建设,保障政府网络公关的实体资源。

  5. VizieR Online Data Catalog: CFHT r- and z-band images 28 Planck sources (van der Burg+, 2016)

    Science.gov (United States)

    van der Burg, R. F. J.; Aussel, H.; Pratt, G. W.; Arnaud, M.; Melin, J.-B.; Aghanim, N.; Barrena, R.; Dahle, H.; Douspis, M.; Ferragamo, A.; Fromenteau, S.; Herbonnet, R.; Hurier, G.; Pointecouteau, E.; Rubino-Martin, J. A.; Streblyanska, A.

    2016-02-01

    Reduced CFHT MegaCam r-, and z-band FITS images of the 28 Planck candidates studied in the paper. WCS information (calibrated w.r.t. USNO-B1) is included. Exposure times are 2000 seconds in each filter. Magnitude zero points are calibrated w.r.t. SDSS (where there is overlap), or else using the Universal stellar locus in combination with WISE Channel 1, as detailed on in the accompanying paper. The MAGZP keywords correspond to the best estimates (with uncertainty ~0.05), in the AB magnitude system. Images are centred on the Planck SZ position, and have a size (15'x15') that is several times larger than the Planck beam, to allow for a study of optical counterparts to the SZ detections. (3 data files).

  6. MRBrainS Challenge: Online Evaluation Framework for Brain Image Segmentation in 3T MRI Scans

    Directory of Open Access Journals (Sweden)

    Adriënne M. Mendrik

    2015-01-01

    Full Text Available Many methods have been proposed for tissue segmentation in brain MRI scans. The multitude of methods proposed complicates the choice of one method above others. We have therefore established the MRBrainS online evaluation framework for evaluating (semiautomatic algorithms that segment gray matter (GM, white matter (WM, and cerebrospinal fluid (CSF on 3T brain MRI scans of elderly subjects (65–80 y. Participants apply their algorithms to the provided data, after which their results are evaluated and ranked. Full manual segmentations of GM, WM, and CSF are available for all scans and used as the reference standard. Five datasets are provided for training and fifteen for testing. The evaluated methods are ranked based on their overall performance to segment GM, WM, and CSF and evaluated using three evaluation metrics (Dice, H95, and AVD and the results are published on the MRBrainS13 website. We present the results of eleven segmentation algorithms that participated in the MRBrainS13 challenge workshop at MICCAI, where the framework was launched, and three commonly used freeware packages: FreeSurfer, FSL, and SPM. The MRBrainS evaluation framework provides an objective and direct comparison of all evaluated algorithms and can aid in selecting the best performing method for the segmentation goal at hand.

  7. Online survey system for image-based clinical guideline studies using the Delphi method.

    Science.gov (United States)

    Harper, Todd M; Teng, Chia-Chi

    2011-01-01

    The increasing use of health information technology (HIT) is due to a rising interest in improving the quality of health care. HIT has the potential to reduce cost and transform services. Proper clinical support systems will contribute to the meaningful use of HIT systems by providing a wide array of data to clinicians for the diagnosis and treatments. Clinical guidelines, created by a consensus of experts, can be put in place to assist physicians in making clinical decisions. Delphi methods are commonly used to create consensus from surveys completed by a team of experts. Image based studies could create guidelines that standardize severity, deformity or other clinical classifications. As these studies were traditionally conducted using paper based media, the cost and time requirement often make the process impractical. Ware proposing a web based system to aid medical researchers in conducting image based Delphi studies for improved clinical guidelines and decision support.

  8. A semantically-aided approach for online annotation and retrieval of medical images.

    Science.gov (United States)

    Kyriazos, George K; Gerostathopoulos, Ilias Th; Kolias, Vassileios D; Stoitsis, John S; Nikita, Konstantina S

    2011-01-01

    The need for annotating the continuously increasing volume of medical image data is recognized from medical experts for a variety of purposes, regardless if this is medical practice, research or education. The rich information content latent in medical images can be made explicit and formal with the use of well-defined ontologies. Evolution of the Semantic Web now offers a unique opportunity of a web-based, service-oriented approach. Remote access to FMA and ICD-10 reference ontologies provides the ontological annotation framework. The proposed system utilizes this infrastructure to provide a customizable and robust annotation procedure. It also provides an intelligent search mechanism indicating the advantages of semantic over keyword search. The common representation layer discussed facilitates interoperability between institutions and systems, while semantic content enables inference and knowledge integration.

  9. VizieR Online Data Catalog: Kepler follow-up observation program. I. Imaging (Furlan+, 2017)

    Science.gov (United States)

    Furlan, E.; Ciardi, D. R.; Everett, M. E.; Saylors, M.; Teske, J. K.; Horch, E. P.; Howell, S. B.; van Belle, G. T.; Hirsch, L. A.; Gautier, T. N.; Adams, E. R.; Barrado, D.; Cartier, K. M. S.; Dressing, C. D.; Dupree, A. K.; Gilliland, R. L.; Lillo-Box, J.; Lucas, P. W.; Wang, J.

    2017-07-01

    We present results from six years of follow-up imaging observations of KOI host stars, including work done by teams from the Kepler Community Follow-up Observation Program (CFOP; https://exofop.ipac.caltech.edu/cfop.php) and by other groups. Several observing facilities were used to obtain high-resolution images of KOI host stars. Table1 lists the various telescopes, instruments used, filter bandpasses, typical Point Spread Function (PSF) widths, number of targets observed, and main references for the published results. The four main observing techniques employed are adaptive optics (Keck, Palomar, Lick, MMT), speckle interferometry (Gemini North, WIYN, DCT), lucky imaging (Calar Alto), and imaging from space with HST. A total of 3557 KOI host stars were observed at 11 facilities with 9 different instruments, using filters from the optical to the near-infrared. In addition, 10 of these stars were also observed at the 8m Gemini North telescope by Ziegler et al. 2016 (AJ accepted, arXiv:1605.03584) using laser guide star adaptive optics. The largest number of KOI host stars (3320) were observed using Robo-AO at the Palomar 1.5m telescope (Baranec et al. 2014ApJ...790L...8B; Baranec et al. 2016, Cat. J/AJ/152/18; Law et al. 2014, Cat. J/ApJ/791/35; Ziegler et al. 2016, AJ accepted, arXiv:1605.03584). A total of 8332 observations were carried out from 2009 September to 2015 October covering 3557 stars. We carried out observations at the Keck, Palomar, and Lick Observatory using the facility adaptive optics systems and near-infrared cameras from 2009 to 2015. At Keck, we observed with the 10m Keck II telescope and Near-Infrared Camera, second generation (NIRC2). The pixel scale of NIRC2 was 0.01''/pixel, resulting in a field of view of about 10''*10''. We observed our targets in a narrow K-band filter, Brγ, which has a central wavelength of 2.1686μm. In most cases, when a companion was detected, we also observed the target in a narrow-band J filter, Jcont, which is

  10. Use of an Online Education Platform to Enhance Patients' Knowledge About Radiation in Diagnostic Imaging.

    Science.gov (United States)

    Steele, Joseph R; Jones, A Kyle; Clarke, Ryan K; Shiao, Sue J; Wei, Wei; Shoemaker, Stowe; Parmar, Simrit

    2017-03-01

    The aim of this study was to compare the impact of a digital interactive education platform and standard paper-based education on patients' knowledge regarding ionizing radiation. Beginning in January 2015, patients at a tertiary cancer center scheduled for diagnostic imaging procedures were randomized to receive information about ionizing radiation delivered through a web-based interactive education platform (interactive education group), the same information in document format (document education group), or no specialized education (control group). Patients who completed at least some education and control group patients were invited to complete a knowledge assessment; interactive education patients were invited to provide feedback about satisfaction with their experience. A total of 2,226 patients participated. Surveys were completed by 302 of 745 patients (40.5%) participating in interactive education, 488 of 993 (49.1%) participating in document education, and 363 of 488 (74.4%) in the control group. Patients in the interactive education group were significantly more likely to say that they knew the definition of ionizing radiation, outperformed the other groups in identifying which imaging examinations used ionizing radiation, were significantly more likely to identify from a list which imaging modality had the highest radiation dose, and tended to perform better when asked about the tissue effects of radiation in diagnostic imaging, although this difference was not significant. In the interactive education group, 84% of patients were satisfied with the experience, and 79% said that they would recommend the program. Complex information on a highly technical subject with personal implications for patients may be conveyed more effectively using electronic platforms, and this approach is well accepted. Copyright © 2016 American College of Radiology. Published by Elsevier Inc. All rights reserved.

  11. PVOL: The Planetary Virtual Observatory & Laboratory. An online database of the Outer Planets images.

    Science.gov (United States)

    Morgado, A.; Sánchez-Lavega, A.; Rojas, J. F.; Hueso, R.

    2005-08-01

    The collaboration between amateurs astronomers and the professional community has been fruitful on many areas of astronomy. The development of the Internet has allowed a better than ever capability of sharing information worldwide and access to other observers data. For many years now the International Jupiter Watch (IJW) Atmospheric discipline has coordinated observational efforts for long-term studies of the atmosphere of Jupiter. The International Outer Planets Watch (IOPW) has extended its labours to the four Outer Planets. Here we present the Planetary Virtual Observatory & Laboratory (PVOL), a website database where we integer IJW and IOPW images. At PVOL observers can submit their data and professionals can search for images under a wide variety of useful criteria such as date and time, filters used, observer, or central meridian longitude. PVOL is aimed to grow as an organized easy to use database of amateur images of the Outer Planets. The PVOL web address is located at http://www.pvol.ehu.es/ and coexists with the traditional IOPW site: http://www.ehu.es/iopw/ Acknowledgements: This work has been funded by Spanish MCYT PNAYA2003-03216, fondos FEDER and Grupos UPV 15946/2004. R. Hueso acknowledges a post-doc fellowship from Gobierno Vasco.

  12. Review of interdisciplinary online-image-databases and their usability in medical education

    Directory of Open Access Journals (Sweden)

    Kammerer, Ferdinand J.

    2006-11-01

    Full Text Available Images play a significant role in medical teaching. They can get prospective physicians acquainted with specific pathological changes as early as possible and they support training their diagnostic eye. The latest improvements in Web-Based-Training offer extensive features for cost-effective studying adjustable to the individual student's requirements. However, many web-sites provide only qualitatively heterogeneous data and a limited inventory of images. This generally complicates any systematic access to the information the student requires.During the last years, several projects were initiated trying to overcome these difficulties. Web-Portals should provide access to large sets of images in a centralized manner while encompassing several medical subjects. For five of these portals their applicability for medical education was investigated considering structure, navigation and search mechanisms. Some notable approaches to implementing the various search functions were observed. However, some sites have room for improvement concerning quality of content as well as clarity of presentation and navigation. Based on the problems discovered and the approaches found, a catalogue of requirements was compiled for creating a Web-Portal to optimally support medical education.

  13. A charismatic new species of green lacewing discovered in Malaysia (Neuroptera, Chrysopidae: the confluence of citizen scientist, online image database and cybertaxonomy

    Directory of Open Access Journals (Sweden)

    Shaun Winterton

    2012-08-01

    Full Text Available An unusual new species of green lacewing (Neuroptera: Chrysopidae: Semachrysa jade sp. n. is described from Selangor (Malaysia as a joint discovery by citizen scientist and professional taxonomists. The incidental nature of this discovery is underscored by the fact that the species was initially photographed and then released, with images subsequently posted to an online image database. It was not until the images in the database were randomly examined by the professional taxonomists that it was determined that the species was in fact new. A subsequent specimen was collected at the same locality and is described herein along with another specimen identified from nearby Sabah.

  14. A charismatic new species of green lacewing discovered in Malaysia (Neuroptera, Chrysopidae): the confluence of citizen scientist, online image database and cybertaxonomy.

    Science.gov (United States)

    Winterton, Shaun L; Guek, Hock Ping; Brooks, Stephen J

    2012-01-01

    An unusual new species of green lacewing (Neuroptera: Chrysopidae: Semachrysa jadesp. n.) is described from Selangor (Malaysia) as a joint discovery by citizen scientist and professional taxonomists. The incidental nature of this discovery is underscored by the fact that the species was initially photographed and then released, with images subsequently posted to an online image database. It was not until the images in the database were randomly examined by the professional taxonomists that it was determined that the species was in fact new. A subsequent specimen was collected at the same locality and is described herein along with another specimen identified from nearby Sabah.

  15. VizieR Online Data Catalog: Imaging observations of iPTF 13ajg (Vreeswijk+, 2014)

    Science.gov (United States)

    Vreeswijk, P. M.; Savaglio, S.; Gal-Yam, A.; De Cia, A.; Quimby, R. M.; Sullivan, M.; Cenko, S. B.; Perley, D. A.; Filippenko, A. V.; Clubb, K. I.; Taddia, F.; Sollerman, J.; Leloudas, G.; Arcavi, I.; Rubin, A.; Kasliwal, M. M.; Cao, Y.; Yaron, O.; Tal, D.; Ofek, E. O.; Capone, J.; Kutyrev, A. S.; Toy, V.; Nugent, P. E.; Laher, R.; Surace, J.; Kulkarni, S. R.

    2017-08-01

    iPTF 13ajg was imaged with the Palomar 48 inch (P48) Oschin iPTF survey telescope equipped with a 12kx8k CCD mosaic camera (Rahmer et al. 2008SPIE.7014E..4YR) in the Mould R filter, the Palomar 60 inch and CCD camera (Cenko et al. 2006PASP..118.1396C) in Johnson B and Sloan Digital Sky Survey (SDSS) gri, the 2.56 m Nordic Optical Telescope (on La Palma, Canary Islands) with the Andalucia Faint Object Spectrograph and Camera (ALFOSC) in SDSS ugriz, the 4.3 m Discovery Channel Telescope (at Lowell Observatory, Arizona) with the Large Monolithic Imager (LMI) in SDSS r, and with LRIS (Oke et al. 1995PASP..107..375O) and the Multi-Object Spectrometer for Infrared Exploration (MOSFIRE; McLean et al. 2012SPIE.8446E..0JM), both mounted on the 10 m Keck-I telescope (on Mauna Kea, Hawaii), in g and Rs with LRIS and J and Ks with MOSFIRE. (1 data file).

  16. VizieR Online Data Catalog: Kepler planet host candidates imaging (Lillo-Box+, 2014)

    Science.gov (United States)

    Lillo-Box, J.; Barrado, D.; Bouy, H.

    2014-09-01

    We applied the lucky imaging technique to the selected targets to achieve diffraction-limited resolution. We used the AstraLux North instrument located at the 2.2m telescope at the Calar Alto Observatory (Almeria, Spain). The targets were observed along three visibility windows of the Kepler field during 2011, 2012, and 2013. The results regarding the non-isolated KOIs of observations on 2011 were published in Lillo-Box et al. (2012A&A...546A..10L, Cat. J/A+A/546/A10). In the present work, we report the results concerning the isolated candidates observed in 2011 and the new results for the 2012-2013 observing runs. (6 data files).

  17. SU-E-T-582: On-Line Dosimetric Verification of Respiratory Gated Volumetric Modulated Arc Therapy Using the Electronic Portal Imaging Device

    Energy Technology Data Exchange (ETDEWEB)

    Schaly, B; Gaede, S [London Regional Cancer Program, London, ON (United Kingdom); Department of Medical Biophysics, Western University, London, ON (United Kingdom); Department of Oncology, Western University, London, ON (United Kingdom); Xhaferllari, I [London Regional Cancer Program, London, ON (United Kingdom); Department of Medical Biophysics, Western University, London, ON (United Kingdom)

    2015-06-15

    Purpose: To investigate the clinical utility of on-line verification of respiratory gated VMAT dosimetry during treatment. Methods: Portal dose images were acquired during treatment in integrated mode on a Varian TrueBeam (v. 1.6) linear accelerator for gated lung and liver patients that used flattening filtered beams. The source to imager distance (SID) was set to 160 cm to ensure imager clearance in case the isocenter was off midline. Note that acquisition of integrated images resulted in no extra dose to the patient. Fraction 1 was taken as baseline and all portal dose images were compared to that of the baseline, where the gamma comparison and dose difference were used to measure day-to-day exit dose variation. All images were analyzed in the Portal Dosimetry module of Aria (v. 10). The portal imager on the TrueBeam was calibrated by following the instructions for dosimetry calibration in service mode, where we define 1 calibrated unit (CU) equal to 1 Gy for 10×10 cm field size at 100 cm SID. This reference condition was measured frequently to verify imager calibration. Results: The gamma value (3%, 3 mm, 5% threshold) ranged between 92% and 100% for the lung and liver cases studied. The exit dose can vary by as much as 10% of the maximum dose for an individual fraction. The integrated images combined with the information given by the corresponding on-line soft tissue matched cone-beam computed tomography (CBCT) images were useful in explaining dose variation. For gated lung treatment, dose variation was mainly due to the diaphragm position. For gated liver treatment, the dose variation was due to both diaphragm position and weight loss. Conclusion: Integrated images can be useful in verifying dose delivery consistency during respiratory gated VMAT, although the CBCT information is needed to explain dose differences due to anatomical changes.

  18. Quality online personalisation

    NARCIS (Netherlands)

    T. Li (Ting); T. Unger (Till)

    2012-01-01

    textabstractWhen done right, personalisation online can be an effective way to enhance the buying or consuming experience, thus stimulating purchasing. However, it can also rely heavily on customers’ private details, a very sensitive and currently hot issue. So, how do online marketeers deal with th

  19. Quality online personalisation

    NARCIS (Netherlands)

    T. Li (Ting); T. Unger (Till)

    2012-01-01

    textabstractWhen done right, personalisation online can be an effective way to enhance the buying or consuming experience, thus stimulating purchasing. However, it can also rely heavily on customers’ private details, a very sensitive and currently hot issue. So, how do online marketeers deal

  20. On-Line GIS Analysis and Image Processing for Geoportal Kielce/poland Development

    Science.gov (United States)

    Hejmanowska, B.; Głowienka, E.; Florek-Paszkowski, R.

    2016-06-01

    GIS databases are widely available on the Internet, but mainly for visualization with limited functionality; very simple queries are possible i.e. attribute query, coordinate readout, line and area measurements or pathfinder. A little more complex analysis (i.e. buffering or intersection) are rare offered. Paper aims at the concept of Geoportal functionality development in the field of GIS analysis. Multi-Criteria Evaluation (MCE) is planned to be implemented in web application. OGC Service is used for data acquisition from the server and results visualization. Advanced GIS analysis is planned in PostGIS and Python programming. In the paper an example of MCE analysis basing on Geoportal Kielce is presented. Other field where Geoportal can be developed is implementation of processing new available satellite images free of charge (Sentinel-2, Landsat 8, ASTER, WV-2). Now we are witnessing a revolution in access to the satellite imagery without charge. This should result in an increase of interest in the use of these data in various fields by a larger number of users, not necessarily specialists in remote sensing. Therefore, it seems reasonable to expand the functionality of Internet's tools for data processing by non-specialists, by automating data collection and prepared predefined analysis.

  1. Characterization of the Mucor circinelloides life cycle by on-line image analysis

    DEFF Research Database (Denmark)

    Lübbehüsen, Tina Louise; Nielsen, Jens; Mcintyre, Mhairi

    2003-01-01

    Aims: The life cycle of the dimorphic fungus Mucor circinelloides was studied in a temperature-controlled flow-through cell, which constitutes an ideal tool when following the development of individual cells, with a view to understanding the growth and differentiation processes occurring in and b......Aims: The life cycle of the dimorphic fungus Mucor circinelloides was studied in a temperature-controlled flow-through cell, which constitutes an ideal tool when following the development of individual cells, with a view to understanding the growth and differentiation processes occurring...... in and between the different morphological forms of the organism.Methods and Results: Mycelial growth and the transformation of hyphae into chains of arthrospores were characterized by image analysis techniques and described quantitatively. The influence of the nature (glucose and xylose) and concentration...... of the carbon source on specific growth rate and hyphal growth unit length were studied. The organism branched more profusely on xylose than on glucose while the specific growth rates determined were rather similar. Methods were developed to study the yeast-like growth phase of M. circinelloides in the flow...

  2. [Practical method for six-dimensional online correction system with image guided radiation therapy].

    Science.gov (United States)

    Nakaguchi, Yuji; Araki, Fujio; Kouno, Tomohiro; Maruyama, Masato

    2012-01-01

    In this study, we developed a correction method for coordinate transformation errors that are produced in combination with the ExacTrac X-ray system (BrainLAB) and HexaPOD (Elekta) in image guided radiation therapy (IGRT). The positional accuracy of the correction method was compared between the ExacTrac Robotics (BrainLAB) and no correction. We tried to correct iBeam evo couch top (Elekta) by operating two steps drive like ExacTrac Robotics. No correction for HexaPOD showed a maximal error of 4.52 mm, and the couch did not move to the correct position. However, our correction method for HexaPOD showed the positional accuracy within 1 mm. Our method has no significant difference with ExacTrac Robotics (paired t-test, P>0.1). But, when the correction values for the rotatory directions were large, the positional accuracy tended to be poor. The smallest setup errors for the rotatory directions are important for IGRT.

  3. Online 3D terrain visualisation using Unity 3D game engine: A comparison of different contour intervals terrain data draped with UAV images

    Science.gov (United States)

    Hafiz Mahayudin, Mohd; Che Mat, Ruzinoor

    2016-06-01

    The main objective of this paper is to discuss on the effectiveness of visualising terrain draped with Unmanned Aerial Vehicle (UAV) images generated from different contour intervals using Unity 3D game engine in online environment. The study area that was tested in this project was oil palm plantation at Sintok, Kedah. The contour data used for this study are divided into three different intervals which are 1m, 3m and 5m. ArcGIS software were used to clip the contour data and also UAV images data to be similar size for the overlaying process. The Unity 3D game engine was used as the main platform for developing the system due to its capabilities which can be launch in different platform. The clipped contour data and UAV images data were process and exported into the web format using Unity 3D. Then process continue by publishing it into the web server for comparing the effectiveness of different 3D terrain data (contour data) draped with UAV images. The effectiveness is compared based on the data size, loading time (office and out-of-office hours), response time, visualisation quality, and frame per second (fps). The results were suggest which contour interval is better for developing an effective online 3D terrain visualisation draped with UAV images using Unity 3D game engine. It therefore benefits decision maker and planner related to this field decide on which contour is applicable for their task.

  4. Online patient dosimetry and an image quality audit system in digital radiology; Auditoria en tiempo real de dosis a los pacientes y claidad de imagen en radiologia digital

    Energy Technology Data Exchange (ETDEWEB)

    Fernandez, J. M.; Vano, E.; Ten, J. I.; Prieto, C.; Martinez, D.

    2006-07-01

    The present work describes an online patient dosimetry and an image quality audit system in digital radiology. the system allows auditing of different parameters depending on contents of DICOM (Digital Imaging and Communication in Medicine) header. For the patient dosimetry audit, current mean values of entrance surface dose (ESD) were compared with local and national reference values (RVs) for the specific examination type evaluated. Mean values exceeding the RV trigger an alarm signal and then an evaluation of the technical parameters, operational practice and image quality starts, using data available in the DICOM header to derive any abnormal settings or performance to obtain the image. the X-ray tube output for different kVp values is measured periodically, allowing for the automatic calculation of the ESD. The system also allows for image quality audit linking it with the dose imparted and other technical parameters if the alarm condition if produced. Results and advantages derived from this online quality control are discussed. (Author) 5 refs.

  5. Application of image texture analysis for online determination of curd moisture and whey solids in a laboratory-scale stirred cheese vat.

    Science.gov (United States)

    Fagan, C C; Du, C J; O'Donnell, C P; Castillo, M; Everard, C D; O'Callaghan, D J; Payne, F A

    2008-08-01

    A noninvasive technology, which could be employed online to monitor syneresis, would facilitate the production of higher quality and more consistent cheese products. Computer vision techniques such as image texture analysis have been successfully established as rapid, consistent, and nondestructive tools for determining the quality of food products. In this study, the potential of image texture analysis to monitor syneresis of cheese curd in a stirred vat was studied. A fully randomized 2-factor (milk pH and stirring speed), 2-level factorial design was carried out in triplicate. During syneresis, images of the surface of the stirred curd-whey mixture were captured using a computer vision system. The images were subjected to 5 image texture analysis methods by which 109 image texture features were extracted. Significant correlations were observed between a number of image texture features and curd moisture and whey solids. Multiscale analysis techniques of fractal dimension and wavelet transform were demonstrated to be the most useful for predicting syneresis indices. Fractal dimension features predicted curd moisture and whey solids during syneresis with standard errors of prediction of 1.03% (w/w) and 0.58 g/kg, respectively. It was concluded that syneresis indices were most closely related to the image texture features of multiscale representation. The results of this study indicate that image texture analysis has potential for monitoring syneresis.

  6. Detailed imaging and genetic analysis reveal a secondary BRAF(L) (505H) resistance mutation and extensive intrapatient heterogeneity in metastatic BRAF mutant melanoma patients treated with vemurafenib

    NARCIS (Netherlands)

    Hoogstraat, Marlous; Gadellaa-van Hooijdonk, Christa G; Ubink, Inge; Besselink, Nicolle J M; Pieterse, Mark; Veldhuis, Wouter; van Stralen, Marijn; Meijer, Eelco F J; Willems, Stefan M; Hadders, Michael A; Kuilman, Thomas; Krijgsman, Oscar; Peeper, Daniel S; Koudijs, Marco J; Cuppen, Edwin; Voest, Emile E; Lolkema, Martijn P

    2015-01-01

    Resistance to treatment is the main problem of targeted treatment for cancer. We followed ten patients during treatment with vemurafenib, by three-dimensional imaging. In all patients, only a subset of lesions progressed. Next-generation DNA sequencing was performed on sequential biopsies in four pa

  7. Preliminary study of a new gamma imager for on-line proton range monitoring during proton radiotherapy

    Science.gov (United States)

    Bennati, P.; Dasu, A.; Colarieti-Tosti, M.; Lönn, G.; Larsson, D.; Fabbri, A.; Galasso, M.; Cinti, M. N.; Pellegrini, R.; Pani, R.

    2017-05-01

    We designed and tested new concept imaging devices, based on a thin scintillating crystal, aimed at the online monitoring of the range of protons in tissue during proton radiotherapy. The proposed crystal can guarantee better spatial resolution and lower sensitivity with respect to a thicker one, at the cost of a coarser energy resolution. Two different samples of thin crystals were coupled to a position sensitive photo multiplier tube read out by 64 independent channels electronics. The detector was equipped with a knife-edge Lead collimator that defined a reasonable field of view of about 10 cm in the target. Geant4 Monte Carlo simulations were used to optimize the design of the experimental setup and assess the accuracy of the results. Experimental measurements were carried out at the Skandion Clinic, the recently opened proton beam facility in Uppsala, Sweden. PMMA and water phantoms studies were performed with a first prototype based on a round 6.0 mm thick Cry019 crystal and with a second detector based on a thinner 5 × 5 cm2, 2.0 mm thick LFS crystal. Phantoms were irradiated with mono-energetic proton beams whose energy was in the range between 110 and 160 MeV. According with the simulations and the experimental data, the detector based on LFS crystal seems able to identify the peak of prompt-gamma radiation and its results are in fair agreement with the expected shift of the proton range as a function of energy. The count rate remains one of the most critical limitations of our system, which was able to cope with only about 20% of the clinical dose rate. Nevertheless, we are confident that our study might provide the basis for developing a new full-functional system.

  8. Research of Image Filtering Algorithm Based on Adaptive Detail Preserving%自适应保细节的图像滤波算法研究

    Institute of Scientific and Technical Information of China (English)

    王志; 汪青

    2016-01-01

    本文利用Matlab软件,结合多尺度和多方向模板,提出了一种新的自适应保细节滤波算法,提高了图像信噪比。本文介绍了数字图像处理的方法和常用的去噪模型并给出了一种改进的中值滤波的特征与描述。%This paper used Matlab software, combining with multi-scale and multi-direction template, a new adaptive filtering algorithm was proposed, which improved the image signal to noise ratio.In this paper, we introduced the method of digital image processing and the commonly used denoising model and gave an im-proved median filter.

  9. Observation of online communities

    DEFF Research Database (Denmark)

    Nørskov, Sladjana V.; Rask, Morten

    2011-01-01

    This paper addresses the application of observation to online settings with a special focus on observer roles. It draws on a study of online observation of a virtual community, i.e. an open source software (OSS) community. The paper examines general and specific advantages and disadvantages...... of the observer roles in online settings by relating these roles to the same roles assumed in offline settings. The study suggests that under the right circumstances online and offline observation may benefit from being combined as they complement each other well. Quality issues and factors important to elicit...... trustworthy observational data from online study settings, such as OSS communities, are discussed. A proposition is made concerning how threats to credibility and transferability in relation to online observation (i.e. lack of richness and detail, risk of misunderstandings) can be diminished, while...

  10. NCI Visuals Online

    Science.gov (United States)

    NCI Visuals Online contains images from the collections of the National Cancer Institute's Office of Communications and Public Liaison, including general biomedical and science-related images, cancer-specific scientific and patient care-related images, and portraits of directors and staff of the National Cancer Institute.

  11. Mastery with Meaning: Access to Mathematics Online

    Science.gov (United States)

    Kennedy, Paul; Ellis, Wade; Oien, Janet; Benoit, Steven

    2007-01-01

    Mastery approaches with online Internet platforms have been shown to alleviate many students' deficiencies and open the door to higher mathematics. This paper details some current programs using online learning for precalculus courses, and detail how the research affected the design, development, and implementation of a new online approach…

  12. Mastery with Meaning: Access to Mathematics Online

    Science.gov (United States)

    Kennedy, Paul; Ellis, Wade; Oien, Janet; Benoit, Steven

    2007-01-01

    Mastery approaches with online Internet platforms have been shown to alleviate many students' deficiencies and open the door to higher mathematics. This paper details some current programs using online learning for precalculus courses, and detail how the research affected the design, development, and implementation of a new online approach…

  13. A Detailed Gravitational Lens Model Based on Submillimeter Array and Keck Adaptive Optics Imaging of a Herschel-ATLAS Sub-millimeter Galaxy at z=4.243

    CERN Document Server

    Bussmann, R S; Fu, Hai; Smith, D J B; Dye, S; Auld, R; Baes, M; Baker, A J; Bonfield, D; Cava, A; Clements, D L; Cooray, A; Coppin, K; Dannerbauer, H; Dariush, A; De Zotti, G; Dunne, L; Eales, S; Fritz, J; Hopwood, R; Ibar, E; Ivison, R J; Jarvis, M J; Kim, S; Leeuw, L L; Maddox, S; Michalowski, M J; Negrello, M; Pascale, E; Pohlen, M; Riechers, D A; Rigby, E; Scott, Douglas; Temi, P; Van der Werf, P P; Verma, A; Wardlow, J; Wilner, D

    2012-01-01

    We present high-spatial resolution imaging obtained with the Submillimeter Array (SMA) at 880um and the Keck Adaptive Optics (AO) system at Ks-band of a gravitationally lensed sub-millimeter galaxy (SMG) at z=4.243 discovered in the Herschel-Astrophysical Terahertz Large Area Survey. The SMA data (angular resolution ~0.6") resolve the dust emission into multiple lensed images, while the Keck AO Ks-band data (angular resolution ~0.1") resolve the lens into a pair of galaxies separated by 0.3". We present an optical spectrum of the foreground lens obtained with the Gemini-South telescope that provides a lens redshift of z_lens = 0.595 +/- 0.005. We develop and apply a new lens modeling technique in the visibility plane that shows that the SMG is magnified by a factor of mu = 4.1 +/- 0.2 and has an intrinsic infrared (IR) luminosity of L_IR = (2.1 +/- 0.2) x 10^13 Lsun. We measure a half-light radius of the background source of r_s = 4.4 +/- 0.5 kpc which implies an IR luminosity surface density of Sigma_IR = (3...

  14. A DETAILED GRAVITATIONAL LENS MODEL BASED ON SUBMILLIMETER ARRAY AND KECK ADAPTIVE OPTICS IMAGING OF A HERSCHEL-ATLAS SUBMILLIMETER GALAXY AT z = 4.243 {sup ,} {sup ,}

    Energy Technology Data Exchange (ETDEWEB)

    Bussmann, R. S.; Gurwell, M. A. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Fu Hai; Cooray, A. [Department of Physics and Astronomy, University of California, Irvine, CA 92697 (United States); Smith, D. J. B.; Bonfield, D.; Dunne, L. [Centre for Astrophysics, Science and Technology Research Institute, University of Hertfordshire, Hatfield, Herts AL10 9AB (United Kingdom); Dye, S.; Eales, S. [School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD (United Kingdom); Auld, R. [Cardiff University, School of Physics and Astronomy, Queens Buildings, The Parade, Cardiff CF24 3AA (United Kingdom); Baes, M.; Fritz, J. [Sterrenkundig Observatorium, Universiteit Gent, Krijgslaan 281 S9, B-9000 Gent (Belgium); Baker, A. J. [Department of Physics and Astronomy, Rutgers, the State University of New Jersey, 136 Frelinghuysen Road, Piscataway, NJ 08854-8019 (United States); Cava, A. [Departamento de Astrofisica, Facultad de CC. Fisicas, Universidad Complutense de Madrid, E-28040 Madrid (Spain); Clements, D. L.; Dariush, A. [Imperial College London, Blackett Laboratory, Prince Consort Road, London SW7 2AZ (United Kingdom); Coppin, K. [Department of Physics, McGill University, Ernest Rutherford Building, 3600 Rue University, Montreal, Quebec, H3A 2T8 (Canada); Dannerbauer, H. [Universitaet Wien, Institut fuer Astronomie, Tuerkenschanzstrasse 17, 1180 Wien, Oesterreich (Austria); De Zotti, G. [Universita di Padova, Dipto di Astronomia, Vicolo dell' Osservatorio 2, IT 35122, Padova (Italy); Hopwood, R., E-mail: rbussmann@cfa.harvard.edu [Department of Physics and Astronomy, Open University, Walton Hall, Milton Keynes, MK7 6AA (United Kingdom); and others

    2012-09-10

    We present high-spatial resolution imaging obtained with the Submillimeter Array (SMA) at 880 {mu}m and the Keck adaptive optics (AO) system at the K{sub S}-band of a gravitationally lensed submillimeter galaxy (SMG) at z = 4.243 discovered in the Herschel Astrophysical Terahertz Large Area Survey. The SMA data (angular resolution Almost-Equal-To 0.''6) resolve the dust emission into multiple lensed images, while the Keck AO K{sub S}-band data (angular resolution Almost-Equal-To 0.''1) resolve the lens into a pair of galaxies separated by 0.''3. We present an optical spectrum of the foreground lens obtained with the Gemini-South telescope that provides a lens redshift of z{sub lens} = 0.595 {+-} 0.005. We develop and apply a new lens modeling technique in the visibility plane that shows that the SMG is magnified by a factor of {mu} = 4.1 {+-} 0.2 and has an intrinsic infrared (IR) luminosity of L{sub IR} = (2.1 {+-} 0.2) Multiplication-Sign 10{sup 13} L{sub Sun }. We measure a half-light radius of the background source of r{sub s} = 4.4 {+-} 0.5 kpc which implies an IR luminosity surface density of {Sigma}{sub IR} (3.4 {+-} 0.9) Multiplication-Sign 10{sup 11} L{sub Sun} kpc{sup -2}, a value that is typical of z > 2 SMGs but significantly lower than IR luminous galaxies at z {approx} 0. The two lens galaxies are compact (r{sub lens} Almost-Equal-To 0.9 kpc) early-types with Einstein radii of {theta}{sub E1} 0.57 {+-} 0.01 and {theta}{sub E2} = 0.40 {+-} 0.01 that imply masses of M{sub lens1} = (7.4 {+-} 0.5) Multiplication-Sign 10{sup 10} M{sub Sun} and M{sub lens2} = (3.7 {+-} 0.3) Multiplication-Sign 10{sup 10} M{sub Sun }. The two lensing galaxies are likely about to undergo a dissipationless merger, and the mass and size of the resultant system should be similar to other early-type galaxies at z {approx} 0.6. This work highlights the importance of high spatial resolution imaging in developing models of strongly lensed galaxies

  15. Comparison between results of detailed tectonic studies on borehole core vs microresistivity images of borehole wall from gas-bearing shale complexes, Baltic Basin, Poland.

    Science.gov (United States)

    Bobek, Kinga; Jarosiński, Marek; Pachytel, Radomir

    2017-04-01

    Structural analysis of borehole core and microresistivity images yield an information about geometry of natural fracture network and their potential importance for reservoir stimulation. Density of natural fractures and their orientation in respect to the maximum horizontal stress has crucial meaning for hydraulic fractures propagation in unconventional reservoirs. We have investigated several hundred meters of continuous borehole core and corresponding microresistivity images (mostly XRMI) from six boreholes in the Pomeranian part of the Early Paleozoic Baltic Basin. In general, our results challenge the question about representatives of statistics based on structural analyses on a small shale volume represented by borehole core or borehole wall images and credibility of different sets of data. Most frequently, fractures observed in both XRMI and cores are steep, small strata-bound fractures and veins with minor mechanical aperture (0,1 mm in average). These veins create an orthogonal joint system, locally disturbed by fractures associated with normal or by gently dipping thrust faults. Mean fractures' height keeps in a range between 30-50 cm. Fracture density differs significantly among boreholes and Consistent Lithological Units (CLUs) but the most frequent means falls in a range 2-4 m-1. We have also payed an attention to bedding planes due to their expected coupling with natural fractures and their role as structural barriers for vertical fracture propagation. We aimed in construction for each CLU the so-called "mean brick", which size is limited by an average distance between two principal joint sets and between bedding fractures. In our study we have found out a discrepancy between structural profiles based on XRMI and core interpretation. For some CLUs joint fractures densities, are higher in cores than in XRMI. In this case, numerous small fractures were not recorded due to the limits of XRMI resolution. However, the most veins with aperture 0,1 mm

  16. Study on Edge Extraction Methods for Image-based Icing On-line Monitoring on Overhead Transmission Lines%输电线路覆冰图像边缘提取方法研究

    Institute of Scientific and Technical Information of China (English)

    王小朋; 胡建林; 吴彬

    2008-01-01

    A new method of measuring the icing thickness of transmission lines on-line is proposed in this paper. In this method, the pictures of transmission lines which are photoed by the camera on the iron tower are processed immediately to extract the edges of the transmission line conductor and transmission line insulators. The icing thickness can be gained by comparing the edges of the iced transmission line and the uniced one. Two icing image edge extraction methods are described in detail, that is, a method based on the combination of the wavelet transform and the floating threshold method and a method based on the combination of the optimal threshold method and the mathematical morphology transform. The icing images from the artificial climatic chamber and transmission lines are used to test the methods above. The results show that the method based on the wavelet transform and the floating threshold method does well in the extraction of relatively smooth edges, such as glaze icing on conductor and icing on the insulator;meanwhile, the method based on the optimal threshold method and the mathematical morphology transform does well in the edge extraction of icing on the conductor, especially the opaque rime icing on the conductor with complicated edges.

  17. Visual overview, oral detail

    DEFF Research Database (Denmark)

    Hertzum, Morten; Simonsen, Jesper

    2015-01-01

    and with the coordinating nurse, who is the main keeper of the whiteboard. On the basis of observations, we find that coordination is accomplished through a highly intertwined process of technologically mediated visual overview combined with orally communicated details. The oral details serve to clarify and elaborate...

  18. LOCKE Detailed Specification Tables

    CERN Document Server

    Menezo, Lucia G; Gregorio, Jose-Angel

    2012-01-01

    This document shows the detailed specification of LOCKE coherence protocol for each cache controller, using a table-based technique. This representation provides clear, concise visual information yet includes sufficient detail (e.g., transient states) arguably lacking in the traditional, graphical form of state diagrams.

  19. Detail and survey radioautographs

    Energy Technology Data Exchange (ETDEWEB)

    Wainwright, Wm.W.

    1949-04-19

    The much used survey or contact type of radioautograph is indispensible for a study of the gross distribution of radioactive materials. A detail radioautograph is equally indispensible. The radioautograph makes possible the determination of plutonium with respect to cells. Outlines of survey and detail techniques are given.

  20. Framing Service, Benefit, and Credibility Through Images and Texts: A Content Analysis of Online Promotional Messages of Korean Medical Tourism Industry.

    Science.gov (United States)

    Jun, Jungmi

    2016-07-01

    This study examines how the Korean medical tourism industry frames its service, benefit, and credibility issues through texts and images of online brochures. The results of content analysis suggest that the Korean medical tourism industry attempts to frame their medical/health services as "excellence in surgeries and cancer care" and "advanced health technology and facilities." However, the use of cost-saving appeals was limited, which can be seen as a strategy to avoid consumers' association of lower cost with lower quality services, and to stress safety and credibility.

  1. Calibration and Validation of a Detailed Architectural Canopy Model Reconstruction for the Simulation of Synthetic Hemispherical Images and Airborne LiDAR Data

    Directory of Open Access Journals (Sweden)

    Magnus Bremer

    2017-02-01

    Full Text Available Canopy density measures such as the Leaf Area Index (LAI have become standardized mapping products derived from airborne and terrestrial Light Detection And Ranging (aLiDAR and tLiDAR, respectively data. A specific application of LiDAR point clouds is their integration into radiative transfer models (RTM of varying complexity. Using, e.g., ray tracing, this allows flexible simulations of sub-canopy light condition and the simulation of various sensors such as virtual hemispherical images or waveform LiDAR on a virtual forest plot. However, the direct use of LiDAR data in RTMs shows some limitations in the handling of noise, the derivation of surface areas per LiDAR point and the discrimination of solid and porous canopy elements. In order to address these issues, a strategy upgrading tLiDAR and Digital Hemispherical Photographs (DHP into plausible 3D architectural canopy models is suggested. The presented reconstruction workflow creates an almost unbiased virtual 3D representation of branch and leaf surface distributions, minimizing systematic errors due to the object–sensor relationship. The models are calibrated and validated using DHPs. Using the 3D models for simulations, their capabilities for the description of leaf density distributions and the simulation of aLiDAR and DHP signatures are shown. At an experimental test site, the suitability of the models, in order to systematically simulate and evaluate aLiDAR based LAI predictions under various scan settings is proven. This strategy makes it possible to show the importance of laser point sampling density, but also the diversity of scan angles and their quantitative effect onto error margins.

  2. Detailed Soils 24K

    Data.gov (United States)

    Kansas Data Access and Support Center — This data set is a digital soil survey and is the most detailed level of soil geographic data developed by the National Cooperative Soil Survey. The information was...

  3. Assessment and treatment planning of lateral intracranial dural arteriovenous fistulas in 3 T MRI and DSA: A detailed analysis under consideration of time-resolved imaging of contrast kinetics (TRICKS) and ce-MRA sequences

    Energy Technology Data Exchange (ETDEWEB)

    Ertl, L.; Brueckmann, H.; Patzig, M.; Brem, C.; Forbrig, R.; Fesl, G. [Ludwig-Maximilians-University, Grosshadern Campus, Department of Neuroradiology, Institute of Clinical Radiology, Munich (Germany); Kunz, M. [Ludwig-Maximilians-University, Grosshadern Campus, Department of Neurosurgery, Munich (Germany)

    2016-12-15

    The current gold standard in the assessment of lateral intracranial dural arteriovenous fistulas (LDAVF) is digital subtraction angiography (DSA). However, magnetic resonance imaging (MRI) is a non-invasive emerging tool for the evaluation of such lesions. The aim of our study was to compare the DSA to our 3 T MR-imaging protocol including a highly spatial resolved (ce-MRA) and a temporal resolved (''time-resolved imaging of contrast kinetics'', TRICKS) contrast-enhanced MR angiography to evaluate if solely DSA can remain the gold-standard imaging modality for the treatment planning of LDAVF. We retrospectively reviewed matched pairs of DSA and 3 T MRI examinations of 24 patients with LDAVF (03/2008-04/2014) by the same list of relevant criteria for an endovascular LDAVF treatment planning. In particular, we determined intermodality agreement for the Cognard classification, the identifeication of arterial feeders, and the detailed assessment of each venous drainage pattern. Intermodality agreement for the Cognard classification was excellent (k = 1.0). Whereas MRI failed in identifying small arterial feeders, it was superior to the DSA in the assessment of the sinus and the venous drainage pattern. The combination of MRI and DSA is the new gold standard in LDAVF treatment planning. (orig.)

  4. Creation of a Reference Image with Monte Carlo Simulations for Online EPID Verification of Daily Patient Setup

    Energy Technology Data Exchange (ETDEWEB)

    Descalle, M-A; Chuang, C; Pouliot, J

    2002-01-30

    Patient positioning accuracy remains an issue for external beam radiotherapy. Currently, kilovoltage verification images are used as reference by clinicians to compare the actual patient treatment position with the planned position. These images are qualitatively different from treatment-time megavoltage portal images. This study will investigate the feasibility of using PEREGRINE, a 3D Monte Carlo calculation engine, to create reference images for portal image comparisons. Portal images were acquired using an amorphous-silicon flat-panel EPID for (1) the head and pelvic sections of an anthropomorphic phantom with 7-8 mm displacements applied, and (2) a prostate patient on five treatment days. Planning CT scans were used to generate simulated reference images with PEREGRINE. A correlation algorithm quantified the setup deviations between simulated and portal images. Monte Carlo simulated images exhibit similar qualities to portal images, the phantom slabs appear clearly. Initial positioning differences and applied displacements were detected and quantified. We find that images simulated with Monte Carlo methods can be used as reference images to detect and quantify set-up errors during treatment.

  5. Learning a sparse representation from multiple still images for on-line face recognition in an unconstrained environment

    NARCIS (Netherlands)

    Tangelder, Johan; Schouten, Ben

    2006-01-01

    In a real-world environment a face detector can be applied to extract multiple face images from multiple video streams without constraints on pose and illumination. The extracted face images will have varying image quality and resolution. Moreover, also the detected faces will not be precisely align

  6. Online Gaming

    Directory of Open Access Journals (Sweden)

    Kevin Curran

    2005-01-01

    Full Text Available Computer gaming is a medium by which we can entertain ourselves, a medium that has expanded to the online worldwide market as part as globalization. The growth of online gaming has close ties with the use of broadband, as a good online gaming experience requires a broadband connection. Through online gaming, people can play and communicate with each other freely in almost any country, at any given time. This paper examines the phenomenon of online gaming.

  7. Three Latin Phonological Details

    DEFF Research Database (Denmark)

    Olsen, Birgit Anette

    2006-01-01

    The present paper deals with three minor details of Latin phonology: 1) the development of the initial sequence *u¿l¿-, where it is suggested that an apparent vacillation between ul- and vol-/vul- represents sandhi variants going back to the proto-language, 2) the adjectives ama¯rus ‘bitter' and ...

  8. Determinants of image quality of rotational angiography for on-line assessment of frame geometry after transcatheter aortic valve implantation.

    Science.gov (United States)

    Rodríguez-Olivares, Ramón; El Faquir, Nahid; Rahhab, Zouhair; Maugenest, Anne-Marie; Van Mieghem, Nicolas M; Schultz, Carl; Lauritsch, Guenter; de Jaegere, Peter P T

    2016-07-01

    To study the determinants of image quality of rotational angiography using dedicated research prototype software for motion compensation without rapid ventricular pacing after the implantation of four commercially available catheter-based valves. Prospective observational study including 179 consecutive patients who underwent transcatheter aortic valve implantation (TAVI) with either the Medtronic CoreValve (MCS), Edward-SAPIEN Valve (ESV), Boston Sadra Lotus (BSL) or Saint-Jude Portico Valve (SJP) in whom rotational angiography (R-angio) with motion compensation 3D image reconstruction was performed. Image quality was evaluated from grade 1 (excellent image quality) to grade 5 (strongly degraded). Distinction was made between good (grades 1, 2) and poor image quality (grades 3-5). Clinical (gender, body mass index, Agatston score, heart rate and rhythm, artifacts), procedural (valve type) and technical variables (isocentricity) were related with the image quality assessment. Image quality was good in 128 (72 %) and poor in 51 (28 %) patients. By univariable analysis only valve type (BSL) and the presence of an artefact negatively affected image quality. By multivariate analysis (in which BMI was forced into the model) BSL valve (Odds 3.5, 95 % CI [1.3-9.6], p = 0.02), presence of an artifact (Odds 2.5, 95 % CI [1.2-5.4], p = 0.02) and BMI (Odds 1.1, 95 % CI [1.0-1.2], p = 0.04) were independent predictors of poor image quality. Rotational angiography with motion compensation 3D image reconstruction using a dedicated research prototype software offers good image quality for the evaluation of frame geometry after TAVI in the majority of patients. Valve type, presence of artifacts and higher BMI negatively affect image quality.

  9. The radiological `second opinion` online through the Internet. Report on implementation and analysis of the diagnostic certainty of transmitted images; Die `Zweite Meinung` in der Radiologie Online ueber das Internet. Bericht ueber die Implementierung und Analyse der Befundungssicherheit von Schnittbildern

    Energy Technology Data Exchange (ETDEWEB)

    Ricke, J. [Strahlenklinik und Poliklinik, Virchow-Klinikum, Medizinische Fakultaet, Humboldt Univ., Berlin (Germany); Donk, E. van der [Het Nederlands Kanker Inst. Antoni van Leeuwenhoekhuis, Amsterdam (Netherlands). Biometrics Dept.; Wolf, M. [Strahlenklinik und Poliklinik, Virchow-Klinikum, Medizinische Fakultaet, Humboldt Univ., Berlin (Germany); Ostendorf, B. [Duesseldorf Univ. (Germany). Rheumazentrum; Hosten, N. [Strahlenklinik und Poliklinik, Virchow-Klinikum, Medizinische Fakultaet, Humboldt Univ., Berlin (Germany); Zielinski, C. [Strahlenklinik und Poliklinik, Virchow-Klinikum, Medizinische Fakultaet, Humboldt Univ., Berlin (Germany); Liebig, T. [Strahlenklinik und Poliklinik, Virchow-Klinikum, Medizinische Fakultaet, Humboldt Univ., Berlin (Germany); Stroszczinski, C. [Strahlenklinik und Poliklinik, Virchow-Klinikum, Medizinische Fakultaet, Humboldt Univ., Berlin (Germany); Loez-Haenninen, E. [Strahlenklinik und Poliklinik, Virchow-Klinikum, Medizinische Fakultaet, Humboldt Univ., Berlin (Germany); Lemke, A.J. [Strahlenklinik und Poliklinik, Virchow-Klinikum, Medizinische Fakultaet, Humboldt Univ., Berlin (Germany); Gillessen, C. [Strahlenklinik und Poliklinik, Virchow-Klinikum, Medizinische Fakultaet, Humboldt Univ., Berlin (Germany); Guervit, Oe. [Strahlenklinik und Poliklinik, Virchow-Klinikum, Medizinische Fakultaet, Humboldt Univ., Berlin (Germany); Amthauer, H. [Strahlenklinik und Poliklinik, Virchow-Klinikum, Medizinische Fakultaet, Humboldt Univ., Berlin (Germany); Kleinholz, L. [Strahlenklinik und Poliklinik, Virchow-Klinikum, Medizinische Fakultaet, Humboldt Univ., Berlin (Germany); Bartelink, H. [Het Nederlands Kanker Inst. Antoni van Leeuwenhoekhuis, Amsterdam (Netherlands). Dept. of Radiotherapy; Felix, R. [Strahlenklinik und Poliklinik, Virchow-Klinikum, Medizinische Fakultaet, Humboldt Univ., Berlin (Germany)

    1997-01-01

    Numerous medical on-line services have already been established in the world-wide Internet. In connection with the Information service TELESCAN, sponsored by the EU, a pilot project has been initiated which offers a radiological `second opinion` via the transmission of radiological findings and images that have been previously rendered anonymous. In addition to a description of the basic implementation, tests of the diagnostic certainty of the transmitted over the Internet, and then evaluated on the receiver`s monitor. Both the transfer of originally generated digital image files (in ACR-NEMA or DICOM) as well as graphic files after digitization of X-ray films, for example by a document camera, is possible via e-mail. Visualization by the receiver requires the use of current proprietary software for special medical image formats, while standard graphic formats such as GIFF or JPEG can be visualized with the usual Internet software. In an ROC analysis, 56 individual images of cranial computed tomographs, half with pathological findings such as space-occupying lesions, infarcts, or brain edema, were tested with regard to the diagnostic certainty after digitization and transmission. In comparison with the original film findings, there was a slight but statistically not significant reduction in diagnostic certainty of the images evaluated on screen after transfer via the Internet. We believe that this result is due to the low local resolution, low dynamic range, the high image noise and of CT arising from the window technique. The same parameters are probably valid for MRI. (orig.) [Deutsch] Im Internet hat sich bereits eine Vielzahl medizinischer Online-Dienstleistungen etabliert. In Verbindung mit dem EU-gefoerderten Informationsdienst TELESCAN wurde ein Pilotprojekt initiiert, das eine radiologische `Zweite Meinung` durch Versenden von anonymisierten radiologischen Bildern und Befunden anbietet. Neben der Beschreibung der Implementierungsgrundlagen wurde die

  10. Processing and Recall of Seductive Details in Scientific Text

    Science.gov (United States)

    Lehman, Stephen; Schraw, Gregory; McCrudden, Matthew T.; Hartley, Kendall

    2007-01-01

    This study examined how seductive details affect on-line processing of a technical, scientific text. In Experiment 1, each sentence from the experimental text was rated for interest and importance. Participants rated seductive details as being more interesting but less important than main ideas. In Experiment 2, we examined the effect of seductive…

  11. Online reklama

    OpenAIRE

    Švarc, Ondřej

    2016-01-01

    This thesis is thematically focused on online advertising. The paper describes the history of online advertising and its advantages and disadvantages compared to other media types. There are mentioned standards of online advertising on the Czech Internet and ways to optimize the different types for better performance. Next we go over the characteristics of selected tools for assessing the success and management of online campaigns. We also compare the advertising possibilities ...

  12. 基于 Web 的遥感影像在线分类实现技术研究%Implementation of Online Remote Sensing Image Classification

    Institute of Scientific and Technical Information of China (English)

    杨会元; 冯钟葵; 李山山

    2015-01-01

    With the growing demand for social service of remote sensing image,how to provide users professional products and services of remote sensing image processing and applications through the internet has become a hot issue.Based on Web RS,advanced network technology and parallel processing technology,this paper presents a technical solution for the implementation of web-based remote sensing image classification,which is not only an useful attempt to explore the concept of Web RS and the value of online services of remote sensing image,but also can help open up new model for remote sensing data sharing and improve the level of social services of remote sensing image.%随着遥感数据的社会化服务需求日益增长,如何以 Web 的方式向用户提供专业遥感影像处理及应用的产品服务成为一个研究的热点问题。本文基于 Web RS 概念,以及先进的网络技术与并行处理技术,提出了基于 Web 的遥感影像在线分类实现技术的解决方案。本研究是探索 Web RS 概念和遥感影像在线服务价值的一次有益尝试,可对于开拓我国遥感数据共享服务新型模式及提高社会化服务水平提供借鉴和支撑。

  13. Determinants of image quality of rotational angiography for on-line assessment of frame geometry after transcatheter aortic valve implantation

    NARCIS (Netherlands)

    R. Rodríguez-Olivares (Ramón); N. El Faquir (Nahid); Z. Rahhab (Zouhair); A.M. Maugenest; N.M. van Mieghem (Nicolas); C. Schultz (Carl); G. Lauritsch (Guenter); P.P.T. de Jaegere (Peter)

    2016-01-01

    textabstractTo study the determinants of image quality of rotational angiography using dedicated research prototype software for motion compensation without rapid ventricular pacing after the implantation of four commercially available catheter-based valves. Prospective observational study including

  14. Investigating Pre-Service Candidates' Images of Mathematical Reasoning: An In-Depth Online Analysis of Common Core Mathematics Standards

    Science.gov (United States)

    Davis, C. E.; Osler, James E.

    2013-01-01

    This paper details the outcomes of a qualitative in-depth investigation into teacher education mathematics preparation. This research is grounded in the notion that mathematics teacher education students (as "degree seeking candidates") need to develop strong foundations of mathematical practice as defined by the Common Core State…

  15. Global detailed gravimetric geoid

    Science.gov (United States)

    Vincent, S.; Marsh, J. G.

    1974-01-01

    A global detailed gravimetric geoid has been computed by combining the Goddard Space Flight Center GEM-4 gravity model derived from satellite and surface gravity data and surface 1 x 1-deg mean free-air gravity anomaly data. The accuracy of the geoid is plus or minus 2 meters on continents, 5 to 7 meters in areas where surface gravity data are sparse, and 10 to 15 meters in areas where no surface gravity data are available. Comparisons have been made with the astrogeodetic data provided by Rice (United States), Bomford (Europe), and Mather (Australia). Comparisons have also been carried out with geoid heights derived from satellite solutions for geocentric station coordinates in North America, the Caribbean, Europe and Australia.

  16. Consider the details

    DEFF Research Database (Denmark)

    Rasmussen, Rasmus; Hertzum, Morten

    2013-01-01

    levels of distance in our study. For revision time, the electronic whiteboard is slower on one subtask but there is no difference on another subtask. Participants prefer the electronic whiteboard. Given the font size of the electronic whiteboard, the inferior reading accuracy is unsurprising......Electronic whiteboards are replacing dry-erase whiteboards in many contexts. In this study we compare electronic and dry-erase whiteboards in emergency departments (EDs) with respect to reading distance and revision time. We find inferior reading accuracy for the electronic whiteboard at all three...... but the reduced possibilities for acquiring information at a glance when clinicians pass the whiteboard may adversely affect their overview. Conversely, the similar revision times for one subtask show that logon may be done quickly. We discuss how details such as font size and logon may impact the high-level...

  17. Template Assembly for Detailed Urban Reconstruction

    KAUST Repository

    Nan, Liangliang

    2015-05-04

    We propose a new framework to reconstruct building details by automatically assembling 3D templates on coarse textured building models. In a preprocessing step, we generate an initial coarse model to approximate a point cloud computed using Structure from Motion and Multi View Stereo, and we model a set of 3D templates of facade details. Next, we optimize the initial coarse model to enforce consistency between geometry and appearance (texture images). Then, building details are reconstructed by assembling templates on the textured faces of the coarse model. The 3D templates are automatically chosen and located by our optimization-based template assembly algorithm that balances image matching and structural regularity. In the results, we demonstrate how our framework can enrich the details of coarse models using various data sets.

  18. Crowdsourcing detailed flood data

    Science.gov (United States)

    Walliman, Nicholas; Ogden, Ray; Amouzad*, Shahrzhad

    2015-04-01

    Over the last decade the average annual loss across the European Union due to flooding has been 4.5bn Euros, but increasingly intense rainfall, as well as population growth, urbanisation and the rising costs of asset replacements, may see this rise to 23bn Euros a year by 2050. Equally disturbing are the profound social costs to individuals, families and communities which in addition to loss of lives include: loss of livelihoods, decreased purchasing and production power, relocation and migration, adverse psychosocial effects, and hindrance of economic growth and development. Flood prediction, management and defence strategies rely on the availability of accurate information and flood modelling. Whilst automated data gathering (by measurement and satellite) of the extent of flooding is already advanced it is least reliable in urban and physically complex geographies where often the need for precise estimation is most acute. Crowdsourced data of actual flood events is a potentially critical component of this allowing improved accuracy in situations and identifying the effects of local landscape and topography where the height of a simple kerb, or discontinuity in a boundary wall can have profound importance. Mobile 'App' based data acquisition using crowdsourcing in critical areas can combine camera records with GPS positional data and time, as well as descriptive data relating to the event. This will automatically produce a dataset, managed in ArcView GIS, with the potential for follow up calls to get more information through structured scripts for each strand. Through this local residents can provide highly detailed information that can be reflected in sophisticated flood protection models and be core to framing urban resilience strategies and optimising the effectiveness of investment. This paper will describe this pioneering approach that will develop flood event data in support of systems that will advance existing approaches such as developed in the in the UK

  19. Detailed IR aperture measurements

    CERN Document Server

    Bruce, Roderik; Garcia Morales, Hector; Giovannozzi, Massimo; Hermes, Pascal Dominik; Mirarchi, Daniele; Quaranta, Elena; Redaelli, Stefano; Rossi, Carlo; Skowronski, Piotr Krzysztof; Wretborn, Sven Joel; CERN. Geneva. ATS Department

    2016-01-01

    MD 1673 was carried out on October 5 2016, in order to investigate in more detail the available aperture in the LHC high-luminosity insertions at 6.5 TeV and β∗=40 cm. Previous aperture measurements in 2016 during commissioning had shown that the available aperture is at the edge of protection, and that the aperture bottleneck at β∗=40 cm in certain cases is found in the separation plane instead of in the crossing plane. Furthermore, the bottlenecks were consistently found in close to the upstream end of Q3 on the side of the incoming beam, and not in Q2 on the outgoing beam as expected from calculations. Therefore, this MD aimed at measuring IR1 and IR5 separately (at 6.5 TeV and β∗=40 cm, for 185 µrad half crossing angle), to further localize the bottlenecks longitudinally using newly installed BLMs, investigate the difference in aperture between Q2 and Q3, and to see if any aperture can be gained using special orbit bumps.

  20. M.mode.ify: A Free Online Tool to Generate Post Hoc M-Mode Images From Any Ultrasound Clip.

    Science.gov (United States)

    Smith, Benjamin C; Avila, Jacob

    2016-02-01

    We present a software tool designed to generate an M-mode image post hoc from any B-mode ultrasound clip, along any possible axis. M.mode.ify works by breaking down an ultrasound clip into individual frames. It then rotates and crops these frames by using a user-selected M-mode line. The post hoc M-mode image is created by splicing these frames together. Users can measure time and distance after proper calibration through the M.mode.ify interface. This tool opens up new possibilities for clinical application, quality assurance, and research. It is available free for public use at http://www.ultrasoundoftheweek.com/M.mode.ify/.

  1. Monitoring tumor motion with on-line mega-voltage cone-beam computed tomography imaging in a cine mode

    Energy Technology Data Exchange (ETDEWEB)

    Reitz, Bodo [Department of Radiation Oncology, Allegheny General Hospital, Pittsburgh, Pennsylvania 15212 (United States); Gayou, Olivier [Department of Radiation Oncology, Allegheny General Hospital, Pittsburgh, Pennsylvania 15212 (United States); Parda, David S [Department of Radiation Oncology, Allegheny General Hospital, Pittsburgh, Pennsylvania 15212 (United States); Miften, Moyed [Department of Radiation Oncology, Allegheny General Hospital, Pittsburgh, Pennsylvania 15212 (United States)

    2008-02-21

    Accurate daily patient localization is becoming increasingly important in external-beam radiotherapy (RT). Mega-voltage cone-beam computed tomography (MV-CBCT) utilizing a therapy beam and an on-board electronic portal imager can be used to localize tumor volumes and verify the patient's position prior to treatment. MV-CBCT produces a static volumetric image and therefore can only account for inter-fractional changes. In this work, the feasibility of using the MV-CBCT raw data as a fluoroscopic series of portal images to monitor tumor changes due to e.g. respiratory motion was investigated. A method was developed to read and convert the CB raw data into a cine. To improve the contrast-to-noise ratio on the MV-CB projection data, image post-processing with filtering techniques was investigated. Volumes of interest from the planning CT were projected onto the MV-cine. Because of the small exposure and the varying thickness of the patient depending on the projection angle, soft-tissue contrast was limited. Tumor visibility as a function of tumor size and projection angle was studied. The method was well suited in the upper chest, where motion of the tumor as well as of the diaphragm could be clearly seen. In the cases of patients with non-small cell lung cancer with medium or large tumor masses, we verified that the tumor mass was always located within the PTV despite respiratory motion. However for small tumors the method is less applicable, because the visibility of those targets becomes marginal. Evaluation of motion in non-superior-inferior directions might also be limited for small tumor masses. Viewing MV-CBCT data in a cine mode adds to the utility of MV-CBCT for verification of tumor motion and for deriving individualized treatment margins.

  2. Monitoring tumor motion with on-line mega-voltage cone-beam computed tomography imaging in a cine mode

    Science.gov (United States)

    Reitz, Bodo; Gayou, Olivier; Parda, David S.; Miften, Moyed

    2008-02-01

    Accurate daily patient localization is becoming increasingly important in external-beam radiotherapy (RT). Mega-voltage cone-beam computed tomography (MV-CBCT) utilizing a therapy beam and an on-board electronic portal imager can be used to localize tumor volumes and verify the patient's position prior to treatment. MV-CBCT produces a static volumetric image and therefore can only account for inter-fractional changes. In this work, the feasibility of using the MV-CBCT raw data as a fluoroscopic series of portal images to monitor tumor changes due to e.g. respiratory motion was investigated. A method was developed to read and convert the CB raw data into a cine. To improve the contrast-to-noise ratio on the MV-CB projection data, image post-processing with filtering techniques was investigated. Volumes of interest from the planning CT were projected onto the MV-cine. Because of the small exposure and the varying thickness of the patient depending on the projection angle, soft-tissue contrast was limited. Tumor visibility as a function of tumor size and projection angle was studied. The method was well suited in the upper chest, where motion of the tumor as well as of the diaphragm could be clearly seen. In the cases of patients with non-small cell lung cancer with medium or large tumor masses, we verified that the tumor mass was always located within the PTV despite respiratory motion. However for small tumors the method is less applicable, because the visibility of those targets becomes marginal. Evaluation of motion in non-superior-inferior directions might also be limited for small tumor masses. Viewing MV-CBCT data in a cine mode adds to the utility of MV-CBCT for verification of tumor motion and for deriving individualized treatment margins.

  3. Online Advertising

    OpenAIRE

    Goldfarb, Avi; Tucker, Catherine Elizabeth

    2011-01-01

    This chapter explores what makes online advertising different from traditional advertising channels. We argue that online advertising differs from traditional advertising channels in two important ways: measurability and targetability. Measurability is higher because the digital nature of online advertising means that responses to ads can be tracked relatively easily. Targetability is higher because data can be automatically tracked at an individual level, and it is relatively easy to show di...

  4. Determination of Bingham Rheological Parameters of SCC using On-line Video Image Analysis of Automatic Slump Flow Testing

    DEFF Research Database (Denmark)

    Thrane, Lars Nyholm; Pade, Claus

    2005-01-01

    A “touch one bottom” prototype system for estimation of Bingham rheological parameters of SCC has been developed. Video image analysis is used to obtain a series of corresponding values of concrete spread versus time during an automatic slump flow test. The spread versus time curve is subsequentl...... used to estimate the Bingham rheological parameters by a least square search into a database. It takes less than 120 seconds from the start of the slump flow test to the SCC’s Bingham rheological parameters appear on the system’s PC....

  5. VizieR Online Data Catalog: A 1689 HAWK-I J-band image (Petrushevska+, 2016)

    Science.gov (United States)

    Petrushevska, T.; Amanullah, R.; Goobar, A.; Fabbro, S.; Johansson, J.; Kjellsson, T.; Lidman, C.; Paech, K.; Richard, J.; Dahle, H.; Ferretti, R.; Kneib, J. P.; Limousin, M.; Nordin, J.; Stanishev, V.

    2016-10-01

    The NIR data were obtained with the High Acuity Wide field K-band imager mounted on the VLT (Programmes ID 082.A-0431, 0.83.A-0398, 090.A-0492, 091.A-0108, P.I. Goobar). The HAWK-I has an array of four 2048x2048 HgCdTe detectors covering a total area of 7.5'x7.5' with a sampling of 0.106"/pix per pixel. The chips are separated by a 15" gap. (2 data files).

  6. Image Segmentation via Online Encoding Based Spectral Clustering%在线编码谱聚类及图像分割方法

    Institute of Scientific and Technical Information of China (English)

    管涛; 段莹; 刘宁

    2013-01-01

    Currently, spectral clustering is a state-of-art technique in image segmentation. However, the O( n3) complexity of spectral clustering its application in image segmentation. Based on the online multiscale compeittive learning, this paper proposes a new rapid spectral clustering algorithm for segmenting of images. This algorithm uses m (monline competitive learning to approximate the distribution of data and then groups prototypes by multiscale spectral clustering. With the approximate complexity O[mn+m2), our algorithm shows high performance and segmentation quality for large scale images. Our algorithm is tested on three data sets. On first data set, our algorithm shows correct grouping of data while NJW algorithm does not. Second, we compute the time consumption of our algorithm and NJW, and present the compression ratios in our algorithm. Results have shown our algorithm behavior better than NJW. At last the segmentation results on standard images of our algorithm take advantage of NJW and Kmeans algorithms and sampling based Nystrom grouping method.%目前,谱聚类已经成为图像分割领域的研究热点,但是,常见谱聚类算法具有0(n3)的复杂度,在图像分割的应用受到限制.基于在线的多尺度竞争学习,文中提出了一种基于在线编码的多尺度谱聚类算法,并应用于图像分割.首先,算法通过在线竞争学习算法构造m(m≤n)个原型来编码原始数据.然后,利用多尺度谱聚类对原型进行分组,标注样本并得到最终的聚类结果.算法的复杂度近似为O(mn十m2),因而,较好地提高了谱聚类在图像分割上的效率.在三组数据上开展了实验:在非凸数据集上的结果表明,文中算法具有良好的多尺度性质.在合成的高斯数据集上进行了效率对比分析,说明文中算法能有效压缩样本量,提高效率.在标准的图像上的分割效率优于通常的NJW谱聚类算法和在分割质量上优于k-means

  7. VizieR Online Data Catalog: K2 LC of HD 3167 and Robo-AO image (Vanderburg+, 2016)

    Science.gov (United States)

    Vanderburg, A.; Bieryla, A.; Duev, D. A.; Jensen-Clem, R.; Latham, D. W.; Mayo, A. W.; Baranec, C.; Berlind, P.; Kulkarni, S.; Law, N. M.; Nieberding, M. N.; Riddle, R.; Maissa, S.

    2016-11-01

    Kepler observed HD 3167 between 2016 January 3 and March 23 during Campaign 8 of its K2 mission. We observed HD 3167 with the Tillinghast Reflector Echelle Spectrograph (TRES) on the 1.5m telescope at the Fred L. Whipple Observatory on Mt. Hopkins, AZ. We acquired one spectrum with a spectral resolving power of R=44000 on 2016 July 11. We observed HD 3167 with the Robo-AO adaptive optics system installed at the 2.1m telescope at Kitt Peak National Observatory. We observed HD 3167 with an i'-band filter on 2016 July 11, taking images at a rate of 8.6Hz for a total of 120s. (2 data files).

  8. Online newspapers as newspapers online - extending the concept of 'newspaper'

    DEFF Research Database (Denmark)

    Falkenberg, Vidar

    2007-01-01

    Online newspapers may be easy to identify, but are difficult to define. This paper discusses how to define the online newspaper and proposes a definition that includes online newspapers with or without printed editions. The definition is based on the functions of a newspaper rather than on who...... the publisher is, and may be seen as extending the concept of the printed newspaper. A planned typology of online newspapers in Denmark will draw on this definition, and this paper explains the methodology that will be used. The two-tiered definition has on the first level a general wording that includes...... a large group of publications, and on the second level, several optional elements are formulated, creating a framework for a detailed typology of online newspapers....

  9. Online newspapers as newspapers online - extending the concept of 'newspaper'

    DEFF Research Database (Denmark)

    Falkenberg, Vidar

    2007-01-01

    Online newspapers may be easy to identify, but are difficult to define. This paper discusses how to define the online newspaper and proposes a definition that includes online newspapers with or without printed editions. The definition is based on the functions of a newspaper rather than on who...... the publisher is, and may be seen as extending the concept of the printed newspaper. A planned typology of online newspapers in Denmark will draw on this definition, and this paper explains the methodology that will be used. The two-tiered definition has on the first level a general wording that includes...... a large group of publications, and on the second level, several optional elements are formulated, creating a framework for a detailed typology of online newspapers....

  10. Images

    Data.gov (United States)

    National Aeronautics and Space Administration — Images for the website main pages and all configurations. The upload and access points for the other images are: Website Template RSW images BSCW Images HIRENASD...

  11. Online Tracking

    Science.gov (United States)

    ... Making Money Privacy, Identity & Online Security Blog Video & Media Scam Alerts ... Feed Facebook YouTube Twitter The Federal Trade Commission (FTC) is the nation’s consumer protection agency. ...

  12. Online dictionaries

    DEFF Research Database (Denmark)

    Tarp, Sven

    2012-01-01

    This article initially provides a panoramic overview and a preliminary typologization of present and future online dictionaries based upon their application of the available technologies and suggests that the future of lexicography will be the development of highly sophisticated tools which may......, need, consultation, and data. The article then proceeds to the discussion of some advanced information science techniques that may contribute to the desired individualization. Upon this basis, it finally discusses the interaction between online dictionaries and external sources like the Internet...

  13. Online marketing

    OpenAIRE

    Zrůst, Daniel

    2013-01-01

    The aim of this thesis is to evaluate pay per click marketing as suitable marketing tool for promotion and distribution of a given product. The paper describes basic vocabulary related to PPC advertising, common metrics, tools used by online marketers, and logic of running PPC campaigns. The paper also tries to quantify impact of Internet on economies. The second part applies the theory to analysis of consumers' conversion path while searching online in common search engines where PPC marketi...

  14. The manipulation of online newspapers

    OpenAIRE

    CONSTANTIN SCHIFIRNEŢ

    2008-01-01

    The paper studies the manipulation on comments from generalist online newspapers. It is analysed the contexts of interactivity between online media and public. The forums media are an alternative to tendencies of manipulation exerted by media. At the same time, some comments create an image or argument that favours their particular interests. The tactics of commentators may include the use of logical fallacies and propaganda techniques.They promote a manipulation of opinions, atitudes and be...

  15. Improving 4D plan quality for PBS-based liver tumour treatments by combining online image guided beam gating with rescanning.

    Science.gov (United States)

    Zhang, Ye; Knopf, Antje-Christin; Weber, Damien Charles; Lomax, Antony John

    2015-10-21

    Pencil beam scanned (PBS) proton therapy has many advantages over conventional radiotherapy, but its effectiveness for treating mobile tumours remains questionable. Gating dose delivery to the breathing pattern is a well-developed method in conventional radiotherapy for mitigating tumour-motion, but its clinical efficiency for PBS proton therapy is not yet well documented. In this study, the dosimetric benefits and the treatment efficiency of beam gating for PBS proton therapy has been comprehensively evaluated. A series of dedicated 4D dose calculations (4DDC) have been performed on 9 different 4DCT(MRI) liver data sets, which give realistic 4DCT extracting motion information from 4DMRI. The value of 4DCT(MRI) is its capability of providing not only patient geometries and deformable breathing characteristics, but also includes variations in the breathing patterns between breathing cycles. In order to monitor target motion and derive a gating signal, we simulate time-resolved beams' eye view (BEV) x-ray images as an online motion surrogate. 4DDCs have been performed using three amplitude-based gating window sizes (10/5/3 mm) with motion surrogates derived from either pre-implanted fiducial markers or the diaphragm. In addition, gating has also been simulated in combination with up to 19 times rescanning using either volumetric or layered approaches. The quality of the resulting 4DDC plans has been quantified in terms of the plan homogeneity index (HI), total treatment time and duty cycle. Results show that neither beam gating nor rescanning alone can fully retrieve the plan homogeneity of the static reference plan. Especially for variable breathing patterns, reductions of the effective duty cycle to as low as 10% have been observed with the smallest gating rescanning window (3 mm), implying that gating on its own for such cases would result in much longer treatment times. In addition, when rescanning is applied on its own, large differences between volumetric

  16. Online Citation and Reference Management Tools

    OpenAIRE

    Das, Anup-Kumar

    2015-01-01

    This Unit is on online citation and reference management tools. The tools discussed are Mendeley, CiteULike, Zotero, Google Scholar Library, and EndNote Basic. The features of all the management tools have been discussed with figures, tables, and text boxes. This Unit discusses in details aspects of different Online Citation and Reference Management Tools. Published in the Open Access for Researchers > Module 4: Research Evaluation Metrics > Unit 4: Online Citation and Reference Management T...

  17. Dynamic Images Used in the Online Media Design StudyFor Example to AdobeFlash%动态图像应用于网络媒体设计之研究——以AdobeFIash为例

    Institute of Scientific and Technical Information of China (English)

    万凯

    2011-01-01

    随着网络技术的发展,Adobe Flash在网络上的应用比重越来越大,而动态图像在网络媒体上表现手法成为了吸引浏览者眼球不可缺少的元素,随着人们对网络设计的需求,Flash不仅在网络媒体上被广泛应用,而且也不断的渗透到了其他的领域,如网络游戏、网络课件、网路广告等等。本文就Adobe Flash的功能及其在网络媒体中的应用进行研究。%With the development of network technology, Adobe Flash applications on the network share in a growing,dynamic image on the performance of the technique in online media to attract visitors to become an indispensable element of the eye,as people demand network design,Flash media,not only in the network is widely used,but also constantly penetrated into other areas,such as online games,online courseware,online advertising,and so on.In this paper, the functions and Adobe Flash media applications in network research.

  18. Concentrating on Affective Feedforward in Online Tutoring

    Science.gov (United States)

    Chen, Ya-Ting; Chou, Yung-Hsin; Cowan, John

    2014-01-01

    With considerable input from the student voice, the paper centres on a detailed account of the experiences of Western academic, tutoring Eastern students online to develop their critical thinking skills. From their online experiences together as tutor and students, the writers present a considered case for the main emphasis in facilitative online…

  19. Out Online

    DEFF Research Database (Denmark)

    Raun, Tobias

    Trans people are increasingly stepping out of the shadow of pathologization and secretiveness to tell their life stories, share information and to connect with like-minded others, using YouTube as a platform. "Out Online: Trans Self-Representation and Community Building on YouTube" explores...... on the ways in which the video blog (or ’vlog’) as a multimodal medium enables trans people to tell their stories with the use of sound, text, music, and pictures - thus offering new ways to construct and archive bodily changes, and to revise the story endlessly. A groundbreaking study of the intersection...... between trans identity and technology, "Out Online" explores the transformative and therapeutic potential of the video blog as a means by which trans vloggers can emerge and develop online, using the vlog as a site for creation, intervention, community building and resistance. As such, it will appeal...

  20. Online Innovation

    DEFF Research Database (Denmark)

    Vujovic, Sladjana; Ulhøi, John Parm

    2008-01-01

    ways of communicating, cooperating and coordinating during the innovation and product development process. Moreover, it challenges the traditional business model in that it forces the actors involved to shift the focus from the innovation itself to the identification of new supporting services higher...... implications for existing software manufacturers. The paper therefore includes the case of IBM, a company which has successfully integrated this new and more open way of collaboration into its business model. Findings - The paper concludes that online computer-based innovation fundamentally challenges current......  Purpose - The aim of this paper is to investigate the role of online networking during the innovation process, including its role(s) in communication, cooperation and coordination. The paper neither implicitly assumes that online computer-based networking is a prerequisite for the innovation...

  1. Online safety

    CERN Document Server

    Healey, Justin

    2015-01-01

    Australians are increasingly connecting online through computers, mobile phones and other electronic devices to access the internet and social media. In the process, young people in particular are becoming more at risk of being exposed to fraud, identity theft, unauthorised access to personal information, stalking, harassment and exposure to illicit or offensive materials. This book presents a range of cybersafety tips to arm readers with an informed awareness of the risks online and offer advice on how to stay protected. A chapter in the book is specifically dedicated to understanding and dea

  2. Online Communities

    DEFF Research Database (Denmark)

    Sørensen, Henrik; Lassen, Astrid Heidemann; Gorm Hansen, Katrine

    Online Communities” er et medie for brugere og fagfolk, hvor de kan mødes digitalt for at dele erfaringer, og dette kan anvendes som inspiration indenfor Brugerdreven Innovation. Via ”desk research” kan virksomheder opnå adgang til varierende mængder af brugere på en forholdsvist enkelt måde. I...... denne rapport beskrives eksperimentets opbygning, resultater og mulige værdi. Vi håber hermed på at kunne give praktisk indsigt i, hvorledes virksomheder fra byggematerialeindustrien kan agere i online communities....

  3. Online 1990.

    Science.gov (United States)

    Goldstein, Morris

    This paper examines the co-existence of online and CD-ROM technologies in terms of their existing pricing structures, marketing strategies, functionality, and future roles. "Fixed Price Unlimited Usage" (FPUU) pricing and flat-rate pricing are discussed as viable alternatives to current pricing practices. In addition, it is argued that the…

  4. Online dictionaries

    DEFF Research Database (Denmark)

    Tarp, Sven

    2012-01-01

    , need, consultation, and data. The article then proceeds to the discussion of some advanced information science techniques that may contribute to the desired individualization. Upon this basis, it finally discusses the interaction between online dictionaries and external sources like the Internet...

  5. Phonetic Detail in American English

    Institute of Scientific and Technical Information of China (English)

    Ray Freeze

    1987-01-01

    @@ In the course of teaching general phonetics and phonological analysis in the psat few years,l have found some phonetic detail which some native speakers as well as non-native speakers were unaware of. This subtle detail will be the focus of this presentation. Som e of this detail many of you will already be aware of because of your experience in learning, teaching, and thinking about English. If anything is new to you, I hope you might enjoy hearing about it even if it turns out not to be useful in your work.

  6. Online stock trading platform

    Directory of Open Access Journals (Sweden)

    Ion LUNGU

    2006-01-01

    Full Text Available The Internet is the perfect tool that can assure the market’s transparency for any user who wants to trade on the stock market. The investor can have access to the market news, financial calendar or the press releases of the issuers. A good online trading platform also provides real-time intraday quotes, trading history and technical analysis giving the investor a clearer view of the supply and demand in the market. All this information provides the investor a good image of the market and encourages him to trade. This paper wishes to draft the pieces of an online trading platform and to analyze the impact of developing and implementing one in a brokerage firm.

  7. Euroscepticism Online

    DEFF Research Database (Denmark)

    Dutceac Segesten, Anamaria; Bossetta Jr, Michael Joseph

    -criticism between Sweden and Denmark? Methodologically we combine quantitative and qualitative content analysis of the forum discussions pertaining to the EU critique taking place on the two platforms respectively. Our focus is thus not on the republished content originated in traditional media channels...... states, leading to numerous street protests. The internet is another site where EU contestation takes place.In the present paper we propose to compare two online platform consisting of user-generated content, where the exchange of ideas and opinions is unfiltered and largely unmoderated. Flashback...... is the leading online discussion forum in Sweden and one of the most popular sites of interaction for those euroskeptic voices coming from the right side of the political spectrum. 180grader is its Danish equivalent. Our research question is: Are there any differences in the discourse surrounding EU...

  8. Euroscepticism Online

    DEFF Research Database (Denmark)

    Dutceac Segesten, Anamaria; Bossetta Jr, Michael Joseph

    -criticism between Sweden and Denmark? Methodologically we combine quantitative and qualitative content analysis of the forum discussions pertaining to the EU critique taking place on the two platforms respectively. Our focus is thus not on the republished content originated in traditional media channels...... states, leading to numerous street protests. The internet is another site where EU contestation takes place.In the present paper we propose to compare two online platform consisting of user-generated content, where the exchange of ideas and opinions is unfiltered and largely unmoderated. Flashback...... and nationalism as the two poles on a continuum of attitudes coming out of the discourses. We discuss finally the consequences of the expected Swedish-Danish divergence of online debate content for the idea of a unified European public sphere....

  9. Online kinship

    DEFF Research Database (Denmark)

    Andreassen, Rikke

    2016-01-01

    The article shows how the technology of social media sites facilitates new kinds of kinship. It ana-lyzes how ‘donor families’ – i.e., families in which the children are conceived via sperm and/or egg donations – negotiate kinship, family formations and gender when connecting with each other online....... Family formation and parenting are closely connected with gender and gender norms, and online donor families, therefore, offer an opportunity for understanding gender and gender for-mations in contemporary times and contemporary media. By analyzing commentary threads of a Facebook group connecting donor...... families as well as interviews with users of this Facebook group, the article shows how the affordances of social media, especially the Facebook application for smart phones, are central to the formation and maintenance of new kinship relations. Furthermore, the article illustrates how conventional...

  10. online-osa festivalil / Tiia Johannson

    Index Scriptorium Estoniae

    Johannson, Tiia, 1965-2002

    1998-01-01

    Prantsusmaa, Balti ja Põhjamaade video ja uue meedia festival "offline@online" Eesti Kunstiakadeemias. Ka eesti netikunstist, festivali korralduslikust küljest, tulevikuplaanidest. Erilist äramärkimist leidis sloveenia kunstniku Vuk Cosici töö "ascii history of moving images", online-presentatsioonide osas Lev Manovichi teoreetiline loeng "Uue meedia keel". Aadress festivali netikunsti vaatamiseks

  11. online-osa festivalil / Tiia Johannson

    Index Scriptorium Estoniae

    Johannson, Tiia, 1965-2002

    1998-01-01

    Prantsusmaa, Balti ja Põhjamaade video ja uue meedia festival "offline@online" Eesti Kunstiakadeemias. Ka eesti netikunstist, festivali korralduslikust küljest, tulevikuplaanidest. Erilist äramärkimist leidis sloveenia kunstniku Vuk Cosici töö "ascii history of moving images", online-presentatsioonide osas Lev Manovichi teoreetiline loeng "Uue meedia keel". Aadress festivali netikunsti vaatamiseks

  12. A vision system for the online quality monitoring of industrial manufacturing

    Science.gov (United States)

    Di Leo, Giuseppe; Liguori, Consolatina; Pietrosanto, Antonio; Sommella, Paolo

    2017-02-01

    The design of an image based measurement system for the online inspection of electromechanical parts is described. A two-camera architecture is introduced in order to highlight all the required details involved in the measurements. The design takes into account both the interfacing and the real-time issues that assure an effective online operation. The description of the measurement system and the corresponding installation on the production line points out a methodological approach to the design of these kinds of measurement systems. The paper provides details about the algorithms for the localization and the measurement of the required quantities, as well as the calibration procedure and the error correction. Experimental tests for the performance evaluation are presented and discussed in terms of timing and accuracy.

  13. A 5' online tutorial about 'how to prepare for a 5' online tutorial'

    CERN Document Server

    CERN. Geneva

    2016-01-01

    This 4' video summarises our experience from short online tutorial recordings for the last 6 months. It contains important points for speakers' preparation and things to observe during the online tutorial recordings. For more details, check out our e-learning twiki.

  14. Developing and Teaching an Online MBA Marketing Research Class: Implications for Online Learning Effectiveness

    Science.gov (United States)

    Sun, Qin; Ganesh, Gopala

    2014-01-01

    The authors intend to describe the experience of developing and teaching an online marketing research class for master of business administration students. The class has been taught for four fall semesters. Each time, the class also completed an online survey, analyzed the resulting data, and wrote a detailed report for a real client. The course…

  15. Developing and Teaching an Online MBA Marketing Research Class: Implications for Online Learning Effectiveness

    Science.gov (United States)

    Sun, Qin; Ganesh, Gopala

    2014-01-01

    The authors intend to describe the experience of developing and teaching an online marketing research class for master of business administration students. The class has been taught for four fall semesters. Each time, the class also completed an online survey, analyzed the resulting data, and wrote a detailed report for a real client. The course…

  16. Three-dimensional Imaging, Visualization, and Display

    CERN Document Server

    Javidi, Bahram; Son, Jung-Young

    2009-01-01

    Three-Dimensional Imaging, Visualization, and Display describes recent developments, as well as the prospects and challenges facing 3D imaging, visualization, and display systems and devices. With the rapid advances in electronics, hardware, and software, 3D imaging techniques can now be implemented with commercially available components and can be used for many applications. This volume discusses the state-of-the-art in 3D display and visualization technologies, including binocular, multi-view, holographic, and image reproduction and capture techniques. It also covers 3D optical systems, 3D display instruments, 3D imaging applications, and details several attractive methods for producing 3D moving pictures. This book integrates the background material with new advances and applications in the field, and the available online supplement will include full color videos of 3D display systems. Three-Dimensional Imaging, Visualization, and Display is suitable for electrical engineers, computer scientists, optical e...

  17. Review of Ship Structural Details

    Science.gov (United States)

    1977-01-01

    8 4.3 Knee and Beam Brackets 4-11 4.3.1 Brackets for Girders and Deep Webs 4-11 4.3.2 Brackets Connecting Rolled Sections 4-15 4.4 Tripping...are shell stringers penetrating deep web frames and longitudinal girders penetrating deep transverses. This is not a common detail. If double...34. 3-76 ^"SECTION ’’.’(-K PLAJ iNG * S v *^ 4Fb^:TH»r.KNF.^ SAME AS FLAMGE ► BULKHFADQR DEEP WEB SS- 9 Detail Type: STANCHION END

  18. Detail in architecture: Between arts

    Directory of Open Access Journals (Sweden)

    Dulencin Juraj

    2016-06-01

    Full Text Available Architectural detail represents an important part of architecture. Not only can it be used as an identifier of a specific building but at the same time enhances the experience of the realized project. Within it lie the signs of a great architect and clues to understanding his or her way of thinking. It is therefore the central topic of a seminar offered to architecture students at the Brno University of Technology. During the course of the semester-long class the students acquaint themselves with atypical architectural details of domestic and international architects by learning to read them, understand them and subsequently draw them by creating architectural blueprints. In other words, by general analysis of a detail the students learn theoretical thinking of its architect who, depending on the nature of the design, had to incorporate a variety of techniques and crafts. Students apply this analytical part to their own architectural detail design. The methodology of the seminar consists of experiential learning by project management and is complemented by a series of lectures discussing a diversity of details as well as materials and technologies required to implement it. The architectural detail design is also part of students’ bachelors thesis, therefore, the realistic nature of their blueprints can be verified in the production process of its physical counterpart. Based on their own documentation the students choose the most suitable manufacturing process whether it is supplied by a specific technology or a craftsman. Students actively participate in the production and correct their design proposals in real scale with the actual material. A student, as a future architect, stands somewhere between a client and an artisan, materializes his or her idea and adjusts the manufacturing process so that the final detail fulfills aesthetic consistency and is in harmony with its initial concept. One of the very important aspects of the design is its

  19. Transformative Dynamics in Detailed Planning

    DEFF Research Database (Denmark)

    Quitzau, Maj-Britt; Poulsen, Naja; Gustavsson, Ted

    that the translation process relies heavily on integration of impositions in the detailed plan, although this has clear limitations, since some sustainable strategies are more difficult to impose than others. It also shows how strategic navigation may represent an alternative translation strategy to promote more...... difficult sustainable strategies that address the project design more directly. In conclusion, the paper argues that strategic navigation represents a stronger mediator of change compared to the detailed plan, but that especially timing issues in the coordination between formal planning and design processes...

  20. Using Digital Earth to create online scientific reality tourist guides to tourist attractions in Taiwan, China

    Science.gov (United States)

    Ding, Yea-Chung

    2010-11-01

    In recent years national parks worldwide have introduced online virtual tourism, through which potential visitors can search for tourist information. Most virtual tourism websites are a simulation of an existing location, usually composed of panoramic images, a sequence of hyperlinked still or video images, and/or virtual models of the actual location. As opposed to actual tourism, a virtual tour is typically accessed on a personal computer or an interactive kiosk. Using modern Digital Earth techniques such as high resolution satellite images, precise GPS coordinates and powerful 3D WebGIS, however, it's possible to create more realistic scenic models to present natural terrain and man-made constructions in greater detail. This article explains how to create an online scientific reality tourist guide for the Jinguashi Gold Ecological Park at Jinguashi in northern Taiwan, China. This project uses high-resolution Formosat 2 satellite images and digital aerial images in conjunction with DTM to create a highly realistic simulation of terrain, with the addition of 3DMAX to add man-made constructions and vegetation. Using this 3D Geodatabase model in conjunction with INET 3D WebGIS software, we have found Digital Earth concept can greatly improve and expand the presentation of traditional online virtual tours on the websites.

  1. DAGAL: Detailed Anatomy of Galaxies

    Science.gov (United States)

    Knapen, Johan H.

    2017-03-01

    The current IAU Symposium is closely connected to the EU-funded network DAGAL (Detailed Anatomy of Galaxies), with the final annual network meeting of DAGAL being at the core of this international symposium. In this short paper, we give an overview of DAGAL, its training activities, and some of the scientific advances that have been made under its umbrella.

  2. DAGAL: Detailed Anatomy of Galaxies

    CERN Document Server

    Knapen, Johan H

    2016-01-01

    The current IAU Symposium is closely connected to the EU-funded network DAGAL (Detailed Anatomy of Galaxies), with the final annual network meeting of DAGAL being at the core of this international symposium. In this short paper, we give an overview of DAGAL, its training activities, and some of the scientific advances that have been made under its umbrella.

  3. On Detailing in Contemporary Architecture

    DEFF Research Database (Denmark)

    Kristensen, Claus; Kirkegaard, Poul Henning

    2010-01-01

    / tactility can blur the meaning of the architecture and turn it into an empty statement. The present paper will outline detailing in contemporary architecture and discuss the issue with respect to architectural quality. Architectural cases considered as sublime piece of architecture will be presented...

  4. 傅里叶变换红外成像光谱仪非均匀性在线定标与校正研究%Study on Nonuniformity Online Calibration and Correction of Fourier Transform Infrared Imaging Spectrometer

    Institute of Scientific and Technical Information of China (English)

    殷世民; 应小凡; 陈洪波; 陈真诚; 相里斌

    2014-01-01

    Due to the particular structure of Fourier transform infrared imaging spectrometer, its nonuniformity online calibration and correction is always a technical problem that has not been solved in engineering. Based on brief review to the principle and algorithm of nonuniformity correction of IRFPA, through in-depth analysis of principle and structure of time modulation, space modulation type and time and space combined modulation type Fourier transform infrared imaging spectrometer, it is given that online method for non-uniformity calibration and correction of three types of Fourier transform infrared imaging spectrometer, which should establish a good technical foundation to on-orbit nonuniformity calibration and correction for Fourier transform infrared imaging spectrometer on satellite.%由于傅里叶变换红外成像光谱仪结构的特殊性,其非均匀性在线定标与校正在工程上一直没有得到有效解决。首先对IRFPA非均匀性校正的原理与算法进行了简要阐述,在此基础上,通过对时间调制型、空间调制型及时间空间联合调制型傅里叶变换红外成像光谱仪原理结构的深入分析,针对这三种制式的光谱仪,分别研究出了相应的非均匀性在线定标与校正的方法,为星载傅里叶变换红外成像光谱仪非均匀性的在轨定标奠定了良好的技术基础。

  5. Gorging Online

    Institute of Scientific and Technical Information of China (English)

    Pride; Phiri

    2011-01-01

    MY introduction to social networking came in my first year of university.I had never been online before then nor used a computer extensively. The archaic machines at my high school had been good for a few rounds of solitaire and nothing more.Growing up in Zimbabwe at the turn of the century where even cell phones were a novelty,the Internet was just something you read about and then added to the list of things that while nice to have,didn’t really factor into everyday life.

  6. The STAR Online Control System

    Science.gov (United States)

    Gilkes, M. L.; Chrin, J.; Olchanski, K.; Pruneau, C. A.; Stone, N. T. B.; Wenaus, T.

    1998-10-01

    The STAR Online Software Group has designed and built a complete control system for the STAR experiment. We support SUN Solaris and Windows NT, and utilize commercial software packages including Orbix (C++) for CORBA IPC, Objectivity/DB (C++) for the configuration database, Borland JBuilder for Java GUI development, EPICS and CDEV for hardware interfacing, and RogueWave libraries (STL, Tools.h++, Threads.h++, Net.h++). The system embodies a unified object-oriented approach to experiment control. Device-specific details are encapsulated in a single server unique to each subsystem (i.e. DAQ, Trigger, sub-detectors). Key online system features include management of subsystem states, configuration management, CORBA messaging, arbitration and synchronization of multiple runs, participation of subsystems in multiple runs, a user interface incorporating ROOT and its C++ interpreter for scripting, JAVA control GUIs with automatic logging, and an online event pool from which consumers can interactively select events.

  7. Design and Implementation of Real-time Image Monitoring System for Online Exam%一种在线考试中实时图像监考系统的设计与实现

    Institute of Scientific and Technical Information of China (English)

    黄志威; 宋鸿陟; 司国东

    2015-01-01

    针对在线考试中一些常规的作弊行为以及当前视频监控方法存在的问题,提出一种基于图像的在线考试监考方案,设计并实现一个实时图像监考系统。该系统通过WebRTC技术调用PC的摄像设备定时对考生拍照,使用WebSocket技术实现图像数据实时传输,综合利用基于AdaBoost算法的人脸检测和基于Fisherfaces方法的人脸识别技术自动发现他人替考、多人作答、擅自离开、中途换人,及时保存证据并通知监考教师。通过仿真测试验证该系统的有效性,为在线考试的监控工作提供可行的辅助手段。%Aiming at some conventional cheatings in online exam and the problems of current video monitoring method, presents the image based in-vigilation scheme. Designs and implements a real-time image based monitoring system for online exam. To realize taking photos regularly for examinees and images data real-time transmission, uses Web real-time technology such WebRTC and WebSocket. To auto discover the cheatings such as replaced by other, multiple answers, leave the seat, substitute examinee in midway, the AdaBoost based face detec-tion and the Fisherfaces based face recognition are utilized comprehensively. Validates the feasibility of the system by simulation test.

  8. First Clinical Release of an Online, Adaptive, Aperture-Based Image-Guided Radiotherapy Strategy in Intensity-Modulated Radiotherapy to Correct for Inter- and Intrafractional Rotations of the Prostate

    Energy Technology Data Exchange (ETDEWEB)

    Deutschmann, Heinz, E-mail: h.deutschmann@salk.at [University Clinic for Radiotherapy and Radio-Oncology, Salzburg (Austria); radART Institute for Research and Development of Advanced Radiation Technologies, Paracelsus Medical University, Salzburg (Austria); Kametriser, Gerhard [University Clinic for Radiotherapy and Radio-Oncology, Salzburg (Austria); Steininger, Philipp [radART Institute for Research and Development of Advanced Radiation Technologies, Paracelsus Medical University, Salzburg (Austria); Scherer, Philipp; Schoeller, Helmut [University Clinic for Radiotherapy and Radio-Oncology, Salzburg (Austria); Gaisberger, Christoph [University Clinic for Radiotherapy and Radio-Oncology, Salzburg (Austria); radART Institute for Research and Development of Advanced Radiation Technologies, Paracelsus Medical University, Salzburg (Austria); Mooslechner, Michaela [radART Institute for Research and Development of Advanced Radiation Technologies, Paracelsus Medical University, Salzburg (Austria); Mitterlechner, Bernhard; Weichenberger, Harald [University Clinic for Radiotherapy and Radio-Oncology, Salzburg (Austria); radART Institute for Research and Development of Advanced Radiation Technologies, Paracelsus Medical University, Salzburg (Austria); Fastner, Gert; Wurstbauer, Karl [University Clinic for Radiotherapy and Radio-Oncology, Salzburg (Austria); Jeschke, Stephan [University Clinic for Urology and Andrology, Salzburg (Austria); Forstner, Rosemarie [University Clinic for Radiology, Salzburg (Austria); Sedlmayer, Felix [University Clinic for Radiotherapy and Radio-Oncology, Salzburg (Austria); radART Institute for Research and Development of Advanced Radiation Technologies, Paracelsus Medical University, Salzburg (Austria)

    2012-08-01

    Purpose: We developed and evaluated a correction strategy for prostate rotations using direct adaptation of segments in intensity-modulated radiotherapy (IMRT). Method and Materials: Implanted fiducials (four gold markers) were used to determine interfractional translations, rotations, and dilations of the prostate. We used hybrid imaging: The markers were automatically detected in two pretreatment planar X-ray projections; their actual position in three-dimensional space was reconstructed from these images at first. The structure set comprising prostate, seminal vesicles, and adjacent rectum wall was transformed accordingly in 6 degrees of freedom. Shapes of IMRT segments were geometrically adapted in a class solution forward-planning approach, derived within seconds on-site and treated immediately. Intrafractional movements were followed in MV electronic portal images captured on the fly. Results: In 31 of 39 patients, for 833 of 1013 fractions (supine, flat couch, knee support, comfortably full bladder, empty rectum, no intraprostatic marker migrations >2 mm of more than one marker), the online aperture adaptation allowed safe reduction of margins clinical target volume-planning target volume (prostate) down to 5 mm when only interfractional corrections were applied: Dominant L-R rotations were found to be 5.3 Degree-Sign (mean of means), standard deviation of means {+-}4.9 Degree-Sign , maximum at 30.7 Degree-Sign . Three-dimensional vector translations relative to skin markings were 9.3 {+-} 4.4 mm (maximum, 23.6 mm). Intrafractional movements in 7.7 {+-} 1.5 min (maximum, 15.1 min) between kV imaging and last beam's electronic portal images showed further L-R rotations of 2.5 Degree-Sign {+-} 2.3 Degree-Sign (maximum, 26.9 Degree-Sign ), and three-dimensional vector translations of 3.0 {+-}3.7 mm (maximum, 10.2 mm). Addressing intrafractional errors could further reduce margins to 3 mm. Conclusion: We demonstrated the clinical feasibility of an online

  9. Paarberatung online

    Directory of Open Access Journals (Sweden)

    Josef Lang

    2005-09-01

    Full Text Available Auf dem Hintergrund der Fragestellungen und der Entwicklung von Beratungsangeboten im Internet generell wird das Spezifische der Paarberatung im Internet dargestellt. Die bekanntesten Angebote in deutscher Sprache werden vorgestellt. In einem Schwerpunkt wird das Konzept von „www.paarberatung.ch“ skizziert. Angebote unterscheiden sich in ihren Zielsetzungen, die auf die unterschiedlichen Erwartungen der Ratsuchenden ausgerichtet sind und auf jede Anfrage zugeschnitten werden. Methodische Leitlinien sind aus der Beratungspsychologie mit Blick auf das Medium Internet abgeleitet.Der Autor bevorzugt den systemischen Ansatz, integriert Methoden des kognitiv-verhaltenstherapeutischen Beratungsansatzes und plädiert dafür, die personspezifischen Elemente einer Anfrage für die Antwort zu nutzen. Grundsätzliches zur Psychologie der Paarberatung und zur Textinterpretation bei einer E-Mail-Beratung wird veranschaulicht mit einem konkreten Beispiel aus der Online-praxis und einer kurzen Beschreibung der Population der Ratsuchenden.

  10. Online Innovation

    DEFF Research Database (Denmark)

    Vujovic, Sladjana; Ulhøi, John Parm

    2008-01-01

    on proprietary knowledge. Design/methodology/approach - The paper borrows from the theory of communities-of-practice, which takes into account social relations, contacts, and the transfer and incorporation of knowledge. Open source innovation is not the exclusive preserve of computer nerds, but also has...... implications for existing software manufacturers. The paper therefore includes the case of IBM, a company which has successfully integrated this new and more open way of collaboration into its business model. Findings - The paper concludes that online computer-based innovation fundamentally challenges current...... for practitioners directly involved in innovation and product development. Originality/value - This paper develops a conceptual framework for understanding product development based on non-proprietary knowledge, which cannot be adequately accounted for by traditional corporate innovation theory alone....

  11. [Imaging].

    Science.gov (United States)

    Chevrot, A; Drapé, J L; Godefroy, D; Dupont, A M; Pessis, E; Sarazin, L; Minoui, A

    1997-01-01

    The panoply of imaging techniques useful in podology is essentially limited to X-rays. Standard "standing" and "lying" X-rays furnish most of the required information. Arthrography is sometimes performed, in particular for trauma or tumour of the ankle. CT scan and MRI make a decisive contribution in difficult cases, notably in fractures and in small fractures without displacement. The two latter techniques are useful in tendon, ligament and muscular disorders, where echography is also informative. Rigorous analysis of radiographies and a good knowledge of foot disorders make these imaging techniques efficacious.

  12. On-Line Acquisitions by LOLITA

    Directory of Open Access Journals (Sweden)

    Frances G. Spigai

    1970-12-01

    Full Text Available The on-line acquisition program (LOLITA in use at the Oregon State University Library is described in terms of development costs, equipment requirements, and overall design philosophy. In particular, the record format and content of records in the on-order file, and the on-line processing of these records (input, search, correction, output using a cathode ray tube display terminal are detailed.

  13. Morphological details in bloodstain particles.

    Science.gov (United States)

    De Wael, K; Lepot, L

    2015-01-01

    During the commission of crimes blood can be transferred to the clothing of the offender or on other crime related objects. Bloodstain particles are sub-millimetre sized flakes that are lost from dried bloodstains. The nature of these red particles is easily confirmed using spectroscopic methods. In casework, bloodstain particles showing highly detailed morphological features were observed. These provided a rationale for a series of experiments described in this work. It was found that the "largest" particles are shed from blood deposited on polyester and polyamide woven fabrics. No particles are lost from the stains made on absorbent fabrics and from those made on knitted fabrics. The morphological features observed in bloodstain particles can provide important information on the substrates from which they were lost. Copyright © 2014 Elsevier Ireland Ltd. All rights reserved.

  14. A Generalized Detailed Balance Relation

    Science.gov (United States)

    Ruelle, David

    2016-08-01

    Given a system M in a thermal bath we obtain a generalized detailed balance relation for the ratio r=π _τ (K→ J)/π _τ (J→ K) of the transition probabilities M:J→ K and M:K→ J in time τ . We assume an active bath, containing solute molecules in metastable states. These molecules may react with M and the transition J→ K occurs through different channels α involving different reactions with the bath. We find that r=sum p^α r^α , where p^α is the probability that channel α occurs, and r^α depends on the amount of heat (more precisely enthalpy) released to the bath in channel α.

  15. A generalized detailed balance relation

    CERN Document Server

    Ruelle, David

    2015-01-01

    Given a system $M$ in a thermal bath we obtain a generalized detailed balance relation for the ratio $r=\\pi_\\tau(K\\to J)/\\pi_\\tau(J\\to K)$ of the transition probabilities $M:J\\to K$ and $M:K\\to J$ in time $\\tau$. We assume an active bath, containing solute molecules in metastable states. These molecules may react with $M$ and the transition $J\\to K$ occurs through different channels $\\alpha$ involving different reactions with the bath. We find that $r=\\sum p^\\alpha r^\\alpha$, where $p^\\alpha$ is the probability that channel $\\alpha$ occurs, and $r^\\alpha$ depends on the amount of heat (more precisely enthalpy) released to the bath in channel $\\alpha$.

  16. Thirty Meter Telescope Detailed Science Case: 2015

    Science.gov (United States)

    Skidmore, Warren; TMT International Science Development Teams; Science Advisory Committee, TMT

    2015-12-01

    The TMT Detailed Science Case describes the transformational science that the Thirty Meter Telescope will enable. Planned to begin science operations in 2024, TMT will open up opportunities for revolutionary discoveries in essentially every field of astronomy, astrophysics and cosmology, seeing much fainter objects much more clearly than existing telescopes. Per this capability, TMT's science agenda fills all of space and time, from nearby comets and asteroids, to exoplanets, to the most distant galaxies, and all the way back to the very first sources of light in the universe. More than 150 astronomers from within the TMT partnership and beyond offered input in compiling the new 2015 Detailed Science Case. The contributing astronomers represent the entire TMT partnership, including the California Institute of Technology (Caltech), the Indian Institute of Astrophysics (IIA), the National Astronomical Observatories of the Chinese Academy of Sciences (NAOC), the National Astronomical Observatory of Japan (NAOJ), the University of California, the Association of Canadian Universities for Research in Astronomy (ACURA) and US associate partner, the Association of Universities for Research in Astronomy (AURA). Cover image: artist's rendition of the TMT International Observatory on Mauna Kea opening in the late evening before beginning operations.

  17. Archaeological Fish Bones Online: a digital archive of Sydney fishes

    Directory of Open Access Journals (Sweden)

    Sarah Colley

    2010-12-01

    Full Text Available The article presents the Archaeological Fish Bone Images sustainable digital archive and XTF-based image search and presentation tools developed with University of Sydney Library. The archive contains over 500 images of modern and archaeological fish remains and was developed as part of an archaeological research project into colonial and traditional Aboriginal fishing practices in Sydney, New South Wales, Australia from c.3000 years ago to the late 19th century. Links are provided to research information about fish ecology and fishing, the cultural and historical significance of fish taxa and details of taxonomic and anatomical nomenclature. Archaeological fish-bone images at the University of Sydney The article explains how and why the archive was developed, and identifies and discusses the research implications of significant gaps in current fish reference collections. Archive content is useful to researchers who need to identify and interpret fish remains of the same or similar biological taxa from Sydney or elsewhere. The design of the archive and online tools is relevant to other applications that use digital images to aid identification and interpretation of archaeological and other collections.

  18. #fitspo on Instagram: A mixed-methods approach using Netlytic and photo analysis, uncovering the online discussion and author/image characteristics.

    Science.gov (United States)

    Santarossa, Sara; Coyne, Paige; Lisinski, Carly; Woodruff, Sarah J

    2016-11-15

    The #fitspo 'tag' is a recent trend on Instagram, which is used on posts to motivate others towards a healthy lifestyle through exercise/eating habits. This study used a mixed-methods approach consisting of text and network analysis via the Netlytic program (N = 10,000 #fitspo posts), and content analysis of #fitspo images (N = 122) was used to examine author and image characteristics. Results suggest that #fitspo posts may motivate through appearance-mediated themes, as the largest content categories (based on the associated text) were 'feeling good' and 'appearance'. Furthermore, #fitspo posts may create peer influence/support as personal (opposed to non-personal) accounts were associated with higher popularity of images (i.e. number of likes/followers). Finally, most images contained posed individuals with some degree of objectification.

  19. University Student Online Plagiarism

    Science.gov (United States)

    Wang, Yu-mei

    2008-01-01

    This article reports a study investigating university student online plagiarism. The following questions are investigated: (a) What is the incidence of student online plagiarism? (b) What are student perceptions regarding online plagiarism? (c) Are there any differences in terms of student perceptions of online plagiarism and print plagiarism? (d)…

  20. Online Organic Chemistry

    Science.gov (United States)

    Janowicz, Philip A.

    2010-01-01

    This is a comprehensive study of the many facets of an entirely online organic chemistry course. Online homework with structure-drawing capabilities was found to be more effective than written homework. Online lecture was found to be just as effective as in-person lecture, and students prefer an online lecture format with shorter Webcasts. Online…

  1. University Student Online Plagiarism

    Science.gov (United States)

    Wang, Yu-mei

    2008-01-01

    This article reports a study investigating university student online plagiarism. The following questions are investigated: (a) What is the incidence of student online plagiarism? (b) What are student perceptions regarding online plagiarism? (c) Are there any differences in terms of student perceptions of online plagiarism and print plagiarism? (d)…

  2. On-Line Long-Exposure Phase Diversity: a Powerful Tool for Sensing Quasi-Static Aberrations of Extreme Adaptive Optics Imaging Systems

    CERN Document Server

    Mugnier, L M; Fusco, T; Cornia, A; Dandy, S

    2008-01-01

    The phase diversity technique is a useful tool to measure and pre-compensate for quasi-static aberrations, in particular non-common path aberrations, in an adaptive optics corrected imaging system. In this paper, we propose and validate by simulations an extension of the phase diversity technique that uses long exposure adaptive optics corrected images for sensing quasi-static aberrations during the scientific observation, in particular for high-contrast imaging. The principle of the method is that, for a sufficiently long exposure time, the residual turbulence is averaged into a convolutive component of the image and that phase diversity estimates the sole static aberrations of interest. The advantages of such a procedure, compared to the processing of short-exposure image pairs, are that the separation between static aberrations and turbulence-induced ones is performed by the long-exposure itself and not numerically, that only one image pair must be processed, that the estimation benefits from the high SNR ...

  3. Magnetic Resonance Imaging (MRI) -- Head

    Medline Plus

    Full Text Available ... are clearer and more detailed than other imaging methods. This exam does not use ionizing radiation and ... clearer and more detailed than with other imaging methods. This detail makes MRI an invaluable tool in ...

  4. Magnetic Resonance Imaging (MRI) -- Head

    Medline Plus

    Full Text Available ... are clearer and more detailed than other imaging methods. This exam does not use ionizing radiation and ... clearer and more detailed than with other imaging methods. This detail makes MRI an invaluable tool in ...

  5. Attitudes toward buying online.

    Science.gov (United States)

    Yang, Bijou; Lester, David

    2004-02-01

    A survey of 11 positive features and 10 discouraging features of online shopping was carried out on 180 students and identified certain behavioral patterns for online shoppers versus non-shoppers. It was found that online shoppers have consistently stronger positive feelings about online shopping than do non-shoppers. On the other hand, non-shoppers have more negative feelings about online shopping than do shoppers, but not consistently so. Online shoppers are aware of some of the discouraging features of online shopping, but these features do not deter them from shopping online. The implication for marketers is that they should focus on making the experience of online shopping more accommodating and more user-friendly since the positive features of online shopping ("convenience" and "efficiency") appear to be more important than the negative features ("effort/impersonality").

  6. Interaction in online interprofessional education case discussions.

    Science.gov (United States)

    Waterston, Rosemary

    2011-07-01

    This study investigated online interaction within a curriculum unit at the University of Toronto, Canada that included an interprofessional case study discussion in a mixed-mode (face-to-face and online) format. Nine of the 81 teams that completed the four-day curriculum were selected for detailed review based on the attitudes students expressed on a survey about the value of collaborating online for enhancing their appreciation of other health care professions. Five of the teams selected were 'positive' and four were 'negative'. The responses to other survey items by members of these teams were then compared, as well as their message posting patterns and the content of their online discussions. Differences between the two sets were situated within a theoretical framework drawn from the contact theory, social interdependence theory, and the Community of Inquiry model. Institutional support in the form of facilitator involvement, individual predispositions to online and group learning, the group composition, the learning materials, task and assignment, and technical factors all affected the levels of participation online. Discourse and organizational techniques were identified that related to interactivity within the online discussions. These findings can help curriculum planners design interprofessional case studies that encourage the interactivity required for successful online discussions.

  7. Online Archives

    Directory of Open Access Journals (Sweden)

    Julian D. Richards

    2004-01-01

    Full Text Available Online archives are of increasing importance in Archaeological Informatics, but like any new genre they prompt a number of questions. What is their relationship to publication? What should go in them? How should they be delivered and indexed? Can they be preserved? Whilst their delivery requires technology, we must also consider how that technology should best be employed in the service of our discipline. This article attempts to address some of these questions but it need not be read from start to finish. The links from this summary provide one fairly linear route through the text but each section is self-contained and can also be accessed directly from the Contents page. The problems posed by effective publication of archaeological fieldwork have exercised the profession for many decades. The issues raised go to the core of discussion of whether preservation by record is a valid concept, and indeed whether archaeological data exist. There are different schools of thought about the relationship between publication and archiving, but hopefully we can accept that data are recorded observations but still agree that they have a re-use value for re-examination and re-interpretation. Since the 1960s archaeology has experienced a publication crisis point. The scenario is familiar. Excavation is destruction; it is an unrepeatable experiment and the archaeologist has a professional obligation to make a full and accessible record of his/her observations. Yet full publication is increasingly expensive and difficult, and excavation monographs are read by few people, and bought by even fewer. In England the development of post-PPG16 fieldwork has exacerbated the problem by creating a mountain of unpublished grey literature and making the work of synthesis even harder; a similar situation exists in other countries. Meanwhile museum archives are also reaching breaking point; most are running out of storage space, few can provide facilities for access, and

  8. Online Shopping Behavior

    OpenAIRE

    Shahzad, Hashim

    2015-01-01

    Online shopping is a very much developed phenomena in Scandinavian countries. Different online factors impact online consumers’ behavior differently depending on the environment of different regions. Sweden is one of the developed and technologically advanced countries. To see the impact of different factors on consumers’ online shopping behavior, the purpose of this study is to analyse the factors that influence consumers’ online shopping behavior in Sweden’s context. One of the objectives o...

  9. Online Marketing Trends

    OpenAIRE

    Horecká, Ivana

    2015-01-01

    This thesis deals with online marketing trends. Its main goal is to define the latest online marketing trends, create a website with the free online marketing trends, and analyse their effectiveness. The theoretical part brings a thorough description of the latest online marketing trends. Moreover, it provides an insight into the latest trends in the website development. The chosen online marketing trends defined in the theoretical part are subsequently applied on a newly created website. All...

  10. Interactive online brain shape visualization

    Directory of Open Access Journals (Sweden)

    Anisha Keshavan

    2017-02-01

    Full Text Available The open-source Mindboggle package improves the labeling and morphometry estimates of brain imaging data. At the 2015 Brainhack event, we developed a web-based, interactive, brain shape visualization of Mindboggle outputs. The application links a 3D brain visualization with boxplots that describe shape measures across a selected cortical label. The code is freely available at http://www.github.com/akeshavan/roygbiv and a demo is online at http://roygbiv.mindboggle.info.

  11. Online fingerprint verification.

    Science.gov (United States)

    Upendra, K; Singh, S; Kumar, V; Verma, H K

    2007-01-01

    As organizations search for more secure authentication methods for user access, e-commerce, and other security applications, biometrics is gaining increasing attention. With an increasing emphasis on the emerging automatic personal identification applications, fingerprint based identification is becoming more popular. The most widely used fingerprint representation is the minutiae based representation. The main drawback with this representation is that it does not utilize a significant component of the rich discriminatory information available in the fingerprints. Local ridge structures cannot be completely characterized by minutiae. Also, it is difficult quickly to match two fingerprint images containing different number of unregistered minutiae points. In this study filter bank based representation, which eliminates these weakness, is implemented and the overall performance of the developed system is tested. The results have shown that this system can be used effectively for secure online verification applications.

  12. Web-based Factors Affecting Online Purchasing Behaviour

    Science.gov (United States)

    Ariff, Mohd Shoki Md; Sze Yan, Ng; Zakuan, Norhayati; Zaidi Bahari, Ahamad; Jusoh, Ahmad

    2013-06-01

    The growing use of internet and online purchasing among young consumers in Malaysia provides a huge prospect in e-commerce market, specifically for B2C segment. In this market, if E-marketers know the web-based factors affecting online buyers' behaviour, and the effect of these factors on behaviour of online consumers, then they can develop their marketing strategies to convert potential customers into active one, while retaining existing online customers. Review of previous studies related to the online purchasing behaviour in B2C market has point out that the conceptualization and empirical validation of the online purchasing behaviour of Information and Communication Technology (ICT) literate users, or ICT professional, in Malaysia has not been clearly addressed. This paper focuses on (i) web-based factors which online buyers (ICT professional) keep in mind while shopping online; and (ii) the effect of web-based factors on online purchasing behaviour. Based on the extensive literature review, a conceptual framework of 24 items of five factors was constructed to determine web-based factors affecting online purchasing behaviour of ICT professional. Analysis of data was performed based on the 310 questionnaires, which were collected using a stratified random sampling method, from ICT undergraduate students in a public university in Malaysia. The Exploratory factor analysis performed showed that five factors affecting online purchase behaviour are Information Quality, Fulfilment/Reliability/Customer Service, Website Design, Quick and Details, and Privacy/Security. The result of Multiple Regression Analysis indicated that Information Quality, Quick and Details, and Privacy/Security affect positively online purchase behaviour. The results provide a usable model for measuring web-based factors affecting buyers' online purchase behaviour in B2C market, as well as for online shopping companies to focus on the factors that will increase customers' online purchase.

  13. An overview of nuclear medicine imaging procedures.

    Science.gov (United States)

    Hogg, Peter; Lawson, Richard

    2015-11-25

    Nuclear medicine imaging is not generally well understood by nurses who work outside this area. Consequently, nurses can find themselves unable to answer patients' questions about nuclear medicine imaging procedures or give them proper information before they attend for a test. This article aims to explain what is involved in some common diagnostic nuclear medicine imaging procedures so that nurses are able to discuss this with patients. It also addresses some common issues about radiation protection that nurses might encounter in their usual working routine. The article includes links to videos showing some typical nuclear medicine imaging procedures from a patient's point of view and links to an e-Learning for Healthcare online resource that provides detailed information for nurses.

  14. Learning Trajectory for Transforming Teachers' Knowledge for Teaching Mathematics and Science with Digital Image and Video Technologies in an Online Learning Experience

    Science.gov (United States)

    Niess, Margaret L.; Gillow-Wiles, Henry

    2014-01-01

    This qualitative cross-case study explores the influence of a designed learning trajectory on transforming teachers' technological pedagogical content knowledge (TPACK) for teaching with digital image and video technologies. The TPACK Learning Trajectory embeds tasks with specific instructional strategies within a social metacognitive…

  15. The Moderating Effects of Corporate Image on the Relationship between Perceived Justice Dimensions and Consumer Attitudes and Repurchase Intentions from Online Shopping in Iran

    Directory of Open Access Journals (Sweden)

    Kamal Ghalandari

    2013-01-01

    Full Text Available The purpose of this study is to investigate the effects of perceived justice dimensions on consumer attitude (Satisfaction with the recovery, overall firm satisfaction and trust and repurchase intentions by considering the role of corporate image. Totally, 400 questionnaires were distributed to university students, that 380 questionnaires were used for the final analysis, which the results from analysis of them based on simple linear regression and multiple hierarchical regression show that distributive justice has a positive influence on satisfaction with the recovery and consumers’ trust; Procedural justice has a positive influence on satisfaction with the recovery, overall firm satisfaction and repurchase intentions; Interactional justice has a positive influence on satisfaction with the recovery, consumers’ trust and repurchase intentions; Satisfaction with the recovery has a positive influence on consumers’ trust, overall firm satisfaction and repurchase intentions; Consumers’ trust has a positive influence on repurchase intentions; Overall firm satisfaction has a positive influence on repurchase intentions. The study also showed that corporate image plays a moderating role in the relationship between perceived justice dimensions and overall firm satisfaction, consumers’ trust and repurchase intentions; also corporate image plays a moderating role in the relationship between interactional justice and satisfaction with the recovery. However, the moderating role of corporate image was not found in the relationship between distributive justice, procedural justice and satisfaction with the recovery.

  16. Image enhancement using thermal-visible fusion for human detection

    Science.gov (United States)

    Zaihidee, Ezrinda Mohd; Hawari Ghazali, Kamarul; Zuki Saleh, Mohd

    2017-09-01

    An increased interest in detecting human beings in video surveillance system has emerged in recent years. Multisensory image fusion deserves more research attention due to the capability to improve the visual interpretability of an image. This study proposed fusion techniques for human detection based on multiscale transform using grayscale visual light and infrared images. The samples for this study were taken from online dataset. Both images captured by the two sensors were decomposed into high and low frequency coefficients using Stationary Wavelet Transform (SWT). Hence, the appropriate fusion rule was used to merge the coefficients and finally, the final fused image was obtained by using inverse SWT. From the qualitative and quantitative results, the proposed method is more superior than the two other methods in terms of enhancement of the target region and preservation of details information of the image.

  17. The Growth, Characteristics, and Future of Online CME

    Science.gov (United States)

    Harris, John M., Jr.; Sklar, Bernard M.; Amend, Robert W.; Novalis-Marine, Cheryl

    2010-01-01

    Introduction: Physician use of online continuing medical education (CME) is growing, but there are conflicting data on the uptake of online CME and few details on this market. Methods: Analyses of 11 years of data from the Accreditation Council for Continuing Medical Education (ACCME) and a survey of 272 publicly available CME Web sites. …

  18. A European Drought Reference Database: Design and Online Implementation

    NARCIS (Netherlands)

    Stagge, J.H.; Tallaksen, L.M.; Kohn, I.; Stahl, K.; Loon, van A.

    2013-01-01

    This report presents the structure and status of the online European Drought Reference (EDR) database. This website provides detailed historical information regarding major historical European drought events. Each drought event is summarized using climatological drought indices, hydrological drought

  19. Nursing student perceptions of community in online learning.

    Science.gov (United States)

    Gallagher-Lepak, Susan; Reilly, Janet; Killion, Cheryl M

    2009-01-01

    Nursing faculty need to understand the unique aspects of online learning environments and develop new pedagogies for teaching in the virtual classroom. The concept of community is important in online learning and a strong sense of community can enhance student engagement and improve learning outcomes in online courses. Student perceptions of community in online learning environments were explored in this study. Five focus group sessions were held and online nursing students were asked to give examples of experiences related to sense of community. Fifteen major themes emerged: class structure, required participation, teamwork, technology, becoming, commonalities, disconnects, mutual exchange, online etiquette, informal discussions, aloneness, trepidation, unknowns, nonverbal communication and anonymity. Themes sorted into the categories of structural, processual and emotional factors. Theme descriptions show how sense of community can be enhanced and/or diminished in online courses. This study adds depth and detail to the limited body of research on sense of community in distance education in nursing courses.

  20. Differentiation in online retailing

    DEFF Research Database (Denmark)

    Kellner, Julian; Wagner, Gerhard; Zielke, Stephan;

    Due to the highly competitive nature of the online retail environment, differentiation strategies are of importance for online retailers to gain competitive advantages and to achieve a unique positioning in the market. However, little is known about perceptual dimensions used by consumers to make...... a distinction between online retailers. The present study addresses this research gap by using a repertory grid approach to identify points of difference between online retailers from a consumer’s perspective. The results have important implications for positioning strategies of online retailers and research...... on online store formats....

  1. volBrain: an online MRI brain volumetry system

    Directory of Open Access Journals (Sweden)

    Jose V. Manjon

    2016-07-01

    Full Text Available The amount of medical image data produced in clinical and research settings is rapidly growing resulting in vast amount of data to analyze. Automatic and reliable quantitative analysis tools, including segmentation, allow to analyze brain development and to understand specific patterns of many neurological diseases. This field has recently experienced many advances with successful techniques based on non-linear warping and label fusion. In this work we present a novel and fully automatic pipeline for volumetric brain analysis based on multi-atlas label fusion technology that is able to provide accurate volumetric information at different levels of detail in a short time. This method is available through the volBrain online web interface (http://volbrain.upv.es, which is publically and freely accessible to the scientific community. Our new framework has been compared with current state-of-the-art methods showing very competitive results.

  2. Radiometry Using Thermal Images. Part 2. Technical Details.

    Science.gov (United States)

    1987-09-01

    A schematic illustrating the optical path is given in figure 1. Attached to the front of the scanner is a focussing telescope which determines the...Field of View of the instrument. The three telescopes , with focal lengths 33 mm, 99 mm and 191 mm, for both SWB and LWB systems are all rated as f/1.8...by mounting the scanner with lens attached to a motorised pan and tilt head with angular read out to an accuracy of ±.5’ of arc (±0.145 mrad). A high

  3. Detailed Seismic Reflection Images of the Central American Volcanic Arc

    Science.gov (United States)

    McIntosh, K. D.; Fulthorpe, C. S.

    2005-12-01

    New high-resolution seismic reflection profiles across the Central American volcanic arc (CAVA) reveal an asymmetric deformation pattern with large-scale folding and uplift of basinal strata in the forearc contrasted by intrusive bodies, normal faults, and possible strikes-slip faults in the backarc. Since Miocene times the CAVA has migrated seaward, apparently impinging on the Sandino forearc basin and creating or modifying the low-lying Nicaragua depression, which contains the backarc and much of the arc. However the structural nature of the depression and its possible relationship to forearc sliver movement is poorly known. In November-December 2004 we recorded a large, high-resolution, seismic reflection dataset largely on the Pacific shelf (forearc) area of Central America, extending from NW Costa Rica to the SE edge of El Salvador's territorial waters. We seized an opportunity to study the nature of the CAVA by recording data into the Gulf of Fonseca, a large embayment at the intersection of Nicaragua, Honduras, and El Salvador. With 3 GI airguns and a 2100 m streamer we recorded data with typical penetration of 2-3 seconds in the Sandino basin and frequency content of ~10-250 Hz (at shallow levels). Penetration was limited over the arc summit with high velocity volcanic rocks encountered at depths as shallow as a few hundred meters. To the NE the edge of the Nicaragua depression occurs abruptly; our data show a well-developed sedimentary basin 1.5-3 km thick separated by numerous steeply-dipping faults. The broadband signal and good penetration of this dataset will help us determine the chronology of arc development in this position and the styles of deformation in the forearc, arc, and backarc areas. In turn, this will help us understand the regional tectonic and stratigraphic development of this margin due to the profound affects of the arc.

  4. Development of an on-line image analysis for assessment of pyrite liberation. Technical report, December 1, 1992--February 28, 1993

    Energy Technology Data Exchange (ETDEWEB)

    Yen, M.S.C.; Chu, P.T.C. [Southern Illinois Univ., Carbondale, IL (United States); Ho, K. [Illinois Clean Coal Inst., Carterville, IL (United States)

    1993-05-01

    An automation procedure based on the principles of image processing is proposed to perform the analysis of pyrite/minerals liberation of coal. To make the automated image analysis system possible, a data base of the light reflectance characteristics of different coal constituents must be established. Characterization of coal images through the analysis of their histogram was conducted. In general, it was found that the distinction of coal particles or particle groups may be accomplished by determining the gray levels of zero pixel or by taking average gray level of each particle. In particular, when the gray level averaging is applied, the spread of gray levels of a given maceral becomes smaller. In other words, the spread in gray level among different maceral group becomes larger. This has led to a distinct boundary between different material group of coal. Two computer programs based on these findings are being developed. The implementation of these criteria will cover most of the coal samples that are previously analyzed. Consideration of special cases will require additional data analysis of histogram.

  5. Vulnerabilities to misinformation in online pharmaceutical marketing.

    Science.gov (United States)

    De Freitas, Julian; Falls, Brian A; Haque, Omar S; Bursztajn, Harold J

    2013-05-01

    Given the large percentage of Internet users who search for health information online, pharmaceutical companies have invested significantly in online marketing of their products. Although online pharmaceutical marketing can potentially benefit both physicians and patients, it can also harm these groups by misleading them. Indeed, some pharmaceutical companies have been guilty of undue influence, which has threatened public health and trust. We conducted a review of the available literature on online pharmaceutical marketing, undue influence and the psychology of decision-making, in order to identify factors that contribute to Internet users' vulnerability to online pharmaceutical misinformation. We find five converging factors: Internet dependence, excessive trust in the veracity of online information, unawareness of pharmaceutical company influence, social isolation and detail fixation. As the Internet continues to change, it is important that regulators keep in mind not only misinformation that surrounds new web technologies and their contents, but also the factors that make Internet users vulnerable to misinformation in the first place. Psychological components are a critical, although often neglected, risk factor for Internet users becoming misinformed upon exposure to online pharmaceutical marketing. Awareness of these psychological factors may help Internet users attentively and safely navigate an evolving web terrain.

  6. Dosimetric effect of intrafraction motion and residual setup error for hypofractionated prostate intensity-modulated radiotherapy with online cone beam computed tomography image guidance.

    LENUS (Irish Health Repository)

    Adamson, Justus

    2012-02-01

    PURPOSE: To quantify the dosimetric effect and margins required to account for prostate intrafractional translation and residual setup error in a cone beam computed tomography (CBCT)-guided hypofractionated radiotherapy protocol. METHODS AND MATERIALS: Prostate position after online correction was measured during dose delivery using simultaneous kV fluoroscopy and posttreatment CBCT in 572 fractions to 30 patients. We reconstructed the dose distribution to the clinical tumor volume (CTV) using a convolution of the static dose with a probability density function (PDF) based on the kV fluoroscopy, and we calculated the minimum dose received by 99% of the CTV (D(99)). We compared reconstructed doses when the convolution was performed per beam, per patient, and when the PDF was created using posttreatment CBCT. We determined the minimum axis-specific margins to limit CTV D(99) reduction to 1%. RESULTS: For 3-mm margins, D(99) reduction was <\\/=5% for 29\\/30 patients. Using post-CBCT rather than localizations at treatment delivery exaggerated dosimetric effects by ~47%, while there was no such bias between the dose convolved with a beam-specific and patient-specific PDF. After eight fractions, final cumulative D(99) could be predicted with a root mean square error of <1%. For 90% of patients, the required margins were <\\/=2, 4, and 3 mm, with 70%, 40%, and 33% of patients requiring no right-left (RL), anteroposterior (AP), and superoinferior margins, respectively. CONCLUSIONS: For protocols with CBCT guidance, RL, AP, and SI margins of 2, 4, and 3 mm are sufficient to account for translational errors; however, the large variation in patient-specific margins suggests that adaptive management may be beneficial.

  7. The Online Underworld.

    Science.gov (United States)

    Scrogan, Len

    1988-01-01

    Discusses some of the misuses of telecommunicating using school computers, including online piracy, hacking, phreaking, online crime, and destruction boards. Suggests ways that schools can deal with these problems. (TW)

  8. Adaptive skin detection based on online training

    Science.gov (United States)

    Zhang, Ming; Tang, Liang; Zhou, Jie; Rong, Gang

    2007-11-01

    Skin is a widely used cue for porn image classification. Most conventional methods are off-line training schemes. They usually use a fixed boundary to segment skin regions in the images and are effective only in restricted conditions: e.g. good lightness and unique human race. This paper presents an adaptive online training scheme for skin detection which can handle these tough cases. In our approach, skin detection is considered as a classification problem on Gaussian mixture model. For each image, human face is detected and the face color is used to establish a primary estimation of skin color distribution. Then an adaptive online training algorithm is used to find the real boundary between skin color and background color in current image. Experimental results on 450 images showed that the proposed method is more robust in general situations than the conventional ones.

  9. On-line multi-slice computed tomography interactive overlay with conventional X-ray: a new and advanced imaging fusion concept.

    Science.gov (United States)

    Garcia, Joel A; Bhakta, Shyam; Kay, Joseph; Chan, Kak-Chen; Wink, Onno; Ruijters, Danny; Carroll, John D

    2009-04-17

    Computed tomography (CT) has revolutionized noninvasive cardiovascular evaluations. Complicated percutaneous procedures require precise imaging guidance that conventional X-ray is often unable to provide. By combining X-ray imaging with real-time, interactive, CT-based landmarks, interventional procedures could be facilitated. We describe two cases using the first CT/Live X-ray overlay in which this technology shows its potential. A 31-year-old male with an anatomically complicated atrial septal defect (ASD) was referred for percutaneous closure. Transesophageal echocardiography (TEE) revealed an inferior location of the ASD complicated by it's proximity to a prominent Eustachian ridge. The CT was used to create a patient-specific physical model in preparation for the procedure and an in-lab real-time CT overlay allowing successful closure. A second case of a 41-year-old male with coronary artery disease status-post coronary artery bypass, aortic valve replacement (AVR), and aortic root replacement with an abnormal coronary computed tomography angiogram (CTA). In a prior procedure years ago the saphenous vein graft (SVG) to the left anterior descending artery (LAD) could not be cannulated during invasive angiography, given the patient's complicated and unusual anatomy. Using CT overlay, the superiorly and anteriorly located SVG was cannulated successfully. CT/Live X-ray overlay provided an adequate anatomical intra-procedural ASD evaluation, defect sizing, and guidance in one case and localization of an anatomically challenging graft ostium in the other case. Adding the CT landmarks as an overlay to traditional X-ray techniques provides a revolutionary and advanced imaging fusion concept that should improve procedural success.

  10. Implementing Online Physical Education

    Science.gov (United States)

    Mohnsen, Bonnie

    2012-01-01

    Online physical education, although seemingly an oxymoron, appears to be the wave of the future at least for some students. The purpose of this article is to explore research and options for online learning in physical education and to examine a curriculum, assessment, and instructional model for online learning. The article examines how physical…

  11. Performance marketing online

    OpenAIRE

    Hamaďáková, Markéta

    2012-01-01

    This thesis discusses the online performance marketing business practices. The theoretical part contains the definition of performance marketing and presents its main components, which include the key performance indicators, the targeting of users, the pricing models of online advertising and affiliate marketing. The second part of the thesis analyzes the performance of online marketing operations for the website FFFFLASH.com.

  12. Ethics in Online Publications.

    Science.gov (United States)

    Vervaart, Peter

    2014-10-01

    Journals have been publishing the results of scientific investigations since the founding of Philosophical Transactions in 1665. Since then we have witnessed a massive expansion in the number of journals to the point that there are now approximately 28,000 active, peer reviewed journals collectively publishing more than 1.8 million articles per year. Before the mid-1990s, these journals were only available on paper but by the end of the 20th century, most journals had moved to online platforms. Online publication has also served as the impetus for the move to 'open-access' to the information contained in journals. The fact that a publication is 'on-line' and 'open-access' does not negate the responsibility of the author and the publisher to publish in an ethical way. [1] The document produced by the IFCC Ethics Task Force (TF-E) on publication ethics states that 'Ethics in Science at its broadest level encompasses research ethics, medical ethics, publication ethics, conflicts of interest, ethical responsibilities as educator, plus many other areas.' Thus publication ethics is a continuum from the first step of research design through to the information being read by the reader. In general terms 'publication ethics' includes the ethical behaviour of the authors in writing and submitting a scientific manuscript to a publisher for the purpose of publication, thus any discussion of publication ethics must include the role of the authors, referees, publisher and reader and the issues of authorship (and the use of 'ghosts'), plagiarism, duplicate publication (including in different languages), image manipulation (particularly in the era of digitisation), and conflict of interest [2]. To aid the authors, and others involved in the process of publication, a number of resources are now available particularly those from the Committee on Publication Ethics (COPE) [3] and the World Association of Medical Editors (WAME) [4]. More recently the issue of 'publisher ethics' has

  13. A PET imaging system dedicated to mammography

    CERN Document Server

    Varela, J

    2007-01-01

    The imaging system Clear-PEM for positron emission mammography, under development within the framework of the Crystal Clear Collaboration at CERN, is presented. The detector is based on pixelized LYSO crystals optically coupled to avalanche photodiodes (APD) and readout by a fast low-noise electronic system. A dedicated digital trigger and data acquisition system is used for on-line selection of coincidence events with high efficiency, large bandwidth and negligible dead-time. The detector module performance was characterized in detail.

  14. Internet prevention messages: targeting the right online behaviors.

    Science.gov (United States)

    Ybarra, Michele L; Mitchell, Kimberly J; Finkelhor, David; Wolak, Janis

    2007-02-01

    Internet safety programs urge youth to avoid sharing personal information and talking with "strangers" online. To examine whether sharing personal information and talking with strangers online or other behaviors are associated with the greatest odds for online interpersonal victimization. The Second Youth Internet Safety Survey was a cross-sectional random digit-dial telephone survey. United States. A total of 1500 youth aged 10 to 17 years who had used the Internet at least once a month for the previous 6 months. Online behavior, including disclosure of personal information, aggressive behavior, talking with people met online, sexual behavior, and downloading images using file-sharing programs. Online interpersonal victimization (ie, unwanted sexual solicitation or harassment). Aggressive behavior in the form of making rude or nasty comments (adjusted odds ratio [AOR], 2.3; Pchild's online behaviors globally in addition to focusing on specific types of behaviors.

  15. Monte Carlo methods beyond detailed balance

    NARCIS (Netherlands)

    Schram, Raoul D.; Barkema, Gerard T.

    2015-01-01

    Monte Carlo algorithms are nearly always based on the concept of detailed balance and ergodicity. In this paper we focus on algorithms that do not satisfy detailed balance. We introduce a general method for designing non-detailed balance algorithms, starting from a conventional algorithm satisfying

  16. Teaching Online: An Integrated Approach

    Science.gov (United States)

    Thomas, Christian

    2012-03-01

    Teaching online is becoming more popular and many web-based tools are available for both traditional and online courses. Web applets, videos, hi-resolution images, c. are available to illustrate and reinforce content. Most are generally used as separate material in the classroom or from a separate web page, not tied directly to the course text. Web pages amalgamate resources based on topics, but are generally not directly linked to the material covered in a textbook. Some textbooks come with separate CDROMs containing extra materials, but these are an add-on. I will present an example of an integrated course text with materials linked directly into the text. This method allows students to look at the illustration at the appropriate time --- when it is relevant to the material they are reading. I will also discuss the benefits of using these materials in an introductory astronomy course.

  17. Online Cake Cutting

    CERN Document Server

    Walsh, Toby

    2010-01-01

    We propose an online form of the cake cutting problem. This models situations where players arrive and depart during the process of dividing a resource. We show that well known fair division procedures like cut-and-choose and the Dubins-Spanier moving knife procedure can be adapted to apply to such online problems. We propose some desirable properties that online cake cutting procedures might possess like online forms of proportionality and envy-freeness, and identify which properties are in fact possessed by the different online cake procedures.

  18. Differentiation in online retailing

    DEFF Research Database (Denmark)

    Kellner, Julian; Wagner, Gerhard; Zielke, Stephan

    Due to the highly competitive nature of the online retail environment, differentiation strategies are of importance for online retailers to gain competitive advantages and to achieve a unique positioning in the market. However, little is known about perceptual dimensions used by consumers to make...... a distinction between online retailers. The present study addresses this research gap by using a repertory grid approach to identify points of difference between online retailers from a consumer’s perspective. The results have important implications for positioning strategies of online retailers and research...

  19. 论认知视域下格式塔意象的细节构建机制--以《浮生六记》英译本为例%On the Constructive Mechanism of the Details of Image-Gestalt in the Cognitive Perspective---A Case Study of English Translation of Six Chapters of a Floating Life

    Institute of Scientific and Technical Information of China (English)

    李文琼

    2014-01-01

    Gestalt psychology is widely used in numerous fields of humanities and social sciences due to its universal effect. In the study of literary translation , Nida, Holmes and Bell successively raise disparate transformation patterns between two languages , directing the research orientation of translation to the operating mechanism of the translator’s psychological cognition. Based on previous studies, Jiang Qiuxia puts forward the transformation schema of image -gestalt dominated by aesthetic connotation. Though the transformation schema of image-gestalt realizes the perfect combination between gestalt psychology and translation aesthetics for the very first time , the relevant details of implementation fails to be specified. This paper dissects Six Chapters of a Floating Life translated by Lin Yutang with multiple perspectives and finds out that the reconstruction of image-gestalt involves aesthetic mentality of the audiences and the cognitive structure of the translator. Moreover, the restoration degree of gestalt quality in the source text closely relates to the language rhythm, the dynamic balance of cultural distance as well as the equivalent transformation of the integral image. This paper finally concludes that the cognitive description towards image-gestalt is feasible and effective.%姜秋霞提出的“格式塔意象”语言转换模式虽然实现了格式塔心理学与翻译美学的完美结合,却没有规定格式塔意象图式的具体构建细节。通过对林语堂《浮生六记》的英译本进行多角度的细致剖析,笔者发现格式塔意象的再造过程涉及受众主体的审美心理和译者自身的认知结构,源文本格式塔质的还原程度与语言节奏的审美功能、文化距离的动态平衡及整体意象的对等转换密切相关,从认知层面对格式塔意象进行细节描述具有可行性和有效性。

  20. Experimental investigation of countercurrent flow limitation (CCFL) in a large-diameter hot-leg geometry: A detailed description of CCFL mechanisms, flow patterns and high-quality HSC imaging of the interfacial structure in a 1/3.9 scale of PWR geometry

    Energy Technology Data Exchange (ETDEWEB)

    Al Issa, S., E-mail: salissa.email@gmail.com; Macian-Juan, R.

    2014-12-15

    Highlights: • Countercurrent flow limitation is experimentally investigated in a large-diameter hot-leg pipe geometry (D{sub in} = 190 mm, ∼1/3.9 scale of a PWR hot-leg). • High-speed and high-quality imaging was implemented to study the interfacial structure and flow patterns during flooding and deflooding. • Two main mechanisms were identified and described in details: bend-CCFL and ADE-CCFL. Four regions were recognized for j{sub water,in}{sup *0.5}=0.085−0.305.. • Experimental curves of the onset of CCFL, and deflooding were discussed. High-quality images provide valuable validation data for CFD. • Form a safety point of view: onset of ADE-CCFL precedes the onset of bend-CCFL and its influence cannot be neglected for j{sub water,in}{sup *0.5}>0.27.. - Abstract: Countercurrent flow limitation (CCFL) is experimentally investigated in large-diameter hot-leg geometry. COLLIDER test facility consists of reactor vessel simulator (RVs), hot-leg pipe, and a steam generator simulator (SGs) and was constructed to be a 1/3.9 scale model of a real PWR geometry. The facility is completely transparent providing excellent conditions for optical observation of the gas/liquid interface. Experiments were performed at atmospheric pressure using air/distilled water as flow mediums. High-quality high speed recording (HSC) was implemented to acquire the air/water interface which provided a unique and detailed look into the interface structure within the entire hot-leg geometry. This allowed a precise and a high-qualitative identification and description of the flow patterns and mechanisms by which the onset of CCFL occurs. A systematic experimental investigation of the onset of CCFL and deflooding was carried out for water inlet velocities in the range J{sub w,in}{sup *0.5}=0.085−0.305,ΔJ{sub w,in}{sup *0.5}=0.01. Air velocity was increased and decreased stepwise to identify the onset of CCFL and deflooding limits precisely. Two onset of CCFL mechanisms were

  1. Exergaming for Physical Activity in Online Physical Education

    Science.gov (United States)

    Kooiman, Brian J.; Sheehan, Dwayne P.; Wesolek, Michael; Reategui, Eliseo

    2016-01-01

    For many the thought of students taking an online course conjures up images of students sitting at a computer desk. Students taking online physical education (OLPE) at home may lack opportunities for competitive or cooperative physical activity that are available to students in a traditional setting. Active video games (exergames) can be played…

  2. A Document Imaging Technique for Implementing Electronic Loan Approval Process

    Directory of Open Access Journals (Sweden)

    J. Manikandan

    2015-04-01

    Full Text Available The image processing is one of the leading technologies of computer applications. Image processing is a type of signal processing, the input for image processor is an image or video frame and the output will be an image or subset of image [1]. Computer graphics and computer vision process uses an image processing techniques. Image processing systems are used in various environments like medical fields, computer-aided design (CAD, research fields, crime investigation fields and military fields. In this paper, we proposed a document image processing technique, for establishing electronic loan approval process (E-LAP [2]. Loan approval process has been tedious process, the E-LAP system attempts to reduce the complexity of loan approval process. Customers have to login to fill the loan application form online with all details and submit the form. The loan department then processes the submitted form and then sends an acknowledgement mail via the E-LAP to the requested customer with the details about list of documents required for the loan approval process [3]. The approaching customer can upload the scanned copies of all required documents. All this interaction between customer and bank take place using an E-LAP system.

  3. Theory and practice of specialised online dictionaries

    DEFF Research Database (Denmark)

    Fuertes-Olivera, Pedro A.; Tarp, Sven

    The book deals with various aspects of specialised lexicography: the discipline and its academic status; the function theory and the various arguments against it; competing theories, especially theories of terminography; various aspects of methodology; special problems related to online...... lexicography; and criticism of a number of existing specialised online dictionaries. Finally, the ideas put forward are exemplified by means of a detailed description of a specialised dictionary project from the planning phase to its publication, as well as recommendations for other types of specialised...

  4. NASA Image Exchange (NIX)

    Data.gov (United States)

    National Aeronautics and Space Administration — NASA Technical Reports Server (NTRS) provides access to aerospace-related citations, full-text online documents, and images and videos. The types of information...

  5. Assessing Emergent Readers' Knowledge about Online Reading

    Science.gov (United States)

    Kervin, Lisa; Mantei, Jessica

    2016-01-01

    The ability to ask questions is essential to learning, reasoning, and understanding. This column introduces a sequence of activities that incorporate the use of digital images and online texts into intentional opportunities for even the youngest learners to work with their teachers and classmates as they wonder, anticipate, explore, and think…

  6. On-line Tools for Solar Data Compiled at the Debrecen Observatory and Their Extensions with the Greenwich Sunspot Data

    Science.gov (United States)

    Baranyi, T.; Győri, L.; Ludmány, A.

    2016-08-01

    The primary task of the Debrecen Heliophysical Observatory (DHO) has been the most detailed, reliable, and precise documentation of the solar photospheric activity since 1958. This long-term effort resulted in various solar catalogs based on ground-based and space-borne observations. A series of sunspot databases and on-line tools were compiled at DHO: the Debrecen Photoheliographic Data (DPD, 1974 -), the dataset based on the Michelson Doppler Imager (MDI) of the Solar and Heliospheric Observatory (SOHO) called SOHO/MDI-Debrecen Data (SDD, 1996 - 2010), and the dataset based on the Helioseismic and Magnetic Imager (HMI) of the Solar Dynamics Observatory (SDO) called SDO/HMI-Debrecen Data (HMIDD, 2010 - ). User-friendly web-presentations and on-line tools were developed to visualize and search data. As a last step of the compilation, the revised version of Greenwich Photoheliographic Results (GPR, 1874 - 1976) catalog was converted to DPD format, and a homogeneous sunspot database covering more than 140 years was created. The database of images for the GPR era was completed with the full-disc drawings of the Hungarian historical observatories Ógyalla and Kalocsa (1872 - 1919) and with the polarity drawings of Mount Wilson Observatory. We describe the main characteristics of the available data and on-line tools.

  7. On-line Tools for Solar Data Compiled at the Debrecen Observatory and Their Extensions with the Greenwich Sunspot Data

    Science.gov (United States)

    Baranyi, T.; Győri, L.; Ludmány, A.

    2016-11-01

    The primary task of the Debrecen Heliophysical Observatory (DHO) has been the most detailed, reliable, and precise documentation of the solar photospheric activity since 1958. This long-term effort resulted in various solar catalogs based on ground-based and space-borne observations. A series of sunspot databases and on-line tools were compiled at DHO: the Debrecen Photoheliographic Data (DPD, 1974 -), the dataset based on the Michelson Doppler Imager (MDI) of the Solar and Heliospheric Observatory (SOHO) called SOHO/MDI-Debrecen Data (SDD, 1996 - 2010), and the dataset based on the Helioseismic and Magnetic Imager (HMI) of the Solar Dynamics Observatory (SDO) called SDO/HMI-Debrecen Data (HMIDD, 2010 - ). User-friendly web-presentations and on-line tools were developed to visualize and search data. As a last step of the compilation, the revised version of Greenwich Photoheliographic Results (GPR, 1874 - 1976) catalog was converted to DPD format, and a homogeneous sunspot database covering more than 140 years was created. The database of images for the GPR era was completed with the full-disc drawings of the Hungarian historical observatories Ógyalla and Kalocsa (1872 - 1919) and with the polarity drawings of Mount Wilson Observatory. We describe the main characteristics of the available data and on-line tools.

  8. Memory for contextual details: effects of emotion and aging.

    Science.gov (United States)

    Kensinger, Elizabeth A; Piguet, Olivier; Krendl, Anne C; Corkin, Suzanne

    2005-06-01

    When individuals are confronted with a complex visual scene that includes some emotional element, memory for the emotional component often is enhanced, whereas memory for peripheral (nonemotional) details is reduced. The present study examined the effects of age and encoding instructions on this effect. With incidental encoding instructions, young and older adults showed this pattern of results, indicating that both groups focused attention on the emotional aspects of the scene. With intentional encoding instructions, young adults no longer showed the effect: They were just as likely to remember peripheral details of negative images as of neutral images. The older adults, in contrast, did not overcome the attentional bias: They continued to show reduced memory for the peripheral elements of the emotional compared with the neutral scenes, even with the intentional encoding instructions.

  9. Nabokov's Details: Making Sense of Irrational Standards

    OpenAIRE

    2012-01-01

    Vladimir Nabokov's passion for detail is well-known, central to our very idea of the "Nabokovian." Yet Nabokov's most important claims for detail pose a challenge for the reader who would take them seriously. Startlingly extreme and deliberately counterintuitive -- Nabokov called them his "irrational standards" -- these claims push the very limits of reason and belief. Nabokov's critics have tended to treat his more extravagant claims for detail -- including his assertion that the "capacity t...

  10. Clinical professional governance for detailed clinical models.

    Science.gov (United States)

    Goossen, William; Goossen-Baremans, Anneke

    2013-01-01

    This chapter describes the need for Detailed Clinical Models for contemporary Electronic Health Systems, data exchange and data reuse. It starts with an explanation of the components related to Detailed Clinical Models with a brief summary of knowledge representation, including terminologies representing clinic relevant "things" in the real world, and information models that abstract these in order to let computers process data about these things. Next, Detailed Clinical Models are defined and their purpose is described. It builds on existing developments around the world and accumulates in current work to create a technical specification at the level of the International Standards Organization. The core components of properly expressed Detailed Clinical Models are illustrated, including clinical knowledge and context, data element specification, code bindings to terminologies and meta-information about authors, versioning among others. Detailed Clinical Models to date are heavily based on user requirements and specify the conceptual and logical levels of modelling. It is not precise enough for specific implementations, which requires an additional step. However, this allows Detailed Clinical Models to serve as specifications for many different kinds of implementations. Examples of Detailed Clinical Models are presented both in text and in Unified Modelling Language. Detailed Clinical Models can be positioned in health information architectures, where they serve at the most detailed granular level. The chapter ends with examples of projects that create and deploy Detailed Clinical Models. All have in common that they can often reuse materials from earlier projects, and that strict governance of these models is essential to use them safely in health care information and communication technology. Clinical validation is one point of such governance, and model testing another. The Plan Do Check Act cycle can be applied for governance of Detailed Clinical Models

  11. Turismo on line, identidad virtual y explotación sexual/ Online tourism, virtual identity and sexual exploitation

    National Research Council Canada - National Science Library

    N C Castillo Murillejo; G Cárdenas; H Rodríguez

    2015-01-01

    .... The literature available on the three variables of study -online tourism, virtual identity and sexual exploitation- was examined in details to systematise fragmented knowledge and identify the...

  12. Displaying of Details in Subvoxel Accuracy

    Institute of Scientific and Technical Information of China (English)

    蔡文立; 陈天洲; 等

    1996-01-01

    Under the volume segmentation in voxel space,a lot of details,some fine and thin objects,are ignored.In order to accurately display these details,this paper has developed a methodology for volume segmentation in subvoxel space.In the subvoxel space,most of the “bridges”between adjacent layers are broken down.Based on the subvoxel space,an automatic segmentation algorithm reserving details is discussed.After segmentation,volume data in subvoxel space are reduced to original voxel space.Thus,the details with width of only one or several voxels are extracted and displayed.

  13. SECONDARY ONLINE EDUCATION: A Review and Synthesis of Central Elements

    Directory of Open Access Journals (Sweden)

    Thomas G. RYAN

    2009-01-01

    Full Text Available In this paper the authors illuminate the distance education field of endeavor to point out that online education can now be found at most educational levels (elementary, secondary, post-secondary globally. This enterprise requires a multitude of traits which are detailed herein in order to alert the new online educator and remind the veteran educator of the essential elements required to achieve desired outcomes. To instruct online clearly requires informed goal setting, clear processes, and predictable outcomes, from the onset. As well designers need to examine current research, conduct online research, and listen to feedback from online students to maintain and nurture both the program and the students. Some key factors of online education are laid out which include strategic intent (planning, content (curriculum, and pedagogy (incorporating current learning theories into delivery models. As well several underpinning qualities are described that must be present such as the teacher’s quality of online instruction, and level of expertise in distance learning. All online educators need to be aware of the student (profile of successful online learners, interaction, assessment/evaluation (rigorous, comparable and authentic, support (student support and training on using the technology, technical infrastructure, and the need to review program frequently which is key to the development and maintenance of successful online education efforts.

  14. Online Detection of Abnormal Events in Video Streams

    Directory of Open Access Journals (Sweden)

    Tian Wang

    2013-01-01

    an image descriptor and online nonlinear classification method. We introduce the covariance matrix of the optical flow and image intensity as a descriptor encoding moving information. The nonlinear online support vector machine (SVM firstly learns a limited set of the training frames to provide a basic reference model then updates the model and detects abnormal events in the current frame. We finally apply the method to detect abnormal events on a benchmark video surveillance dataset to demonstrate the effectiveness of the proposed technique.

  15. Video-based facial animation with detailed appearance texture

    Institute of Scientific and Technical Information of China (English)

    2006-01-01

    Facial shape transformation described by facial animation parameters (FAPs) involves the dynamic movement or deformation of eyes, brows, mouth, and lips, while detailed facial appearance concerns the facial textures such as creases, wrinkles, etc.Video-based facial animation exhibits not only facial shape transformation but also detailed appearance updates. In this paper, a novel algorithm for effectively extracting FAPs from video is proposed. Our system adopts the ICA-enforced direct appearance model (DAM) to track faces from video sequences; and then, FAPs are extracted from every frame of the video based on an extended model of Wincandidate 3.1. Facial appearance details are transformed from each frame by mapping an expression ratio image to the original image. We adopt wavelet to synthesize expressive details by combining the low-frequency signals of the original face and high-frequency signals of the expressive face from each frame of the video. Experimental results show that our proposed algorithm is suitable for reproducing realistic, expressive facial animations.

  16. ONLINE PUBLISHING CURRENT SCENARIO

    Directory of Open Access Journals (Sweden)

    Balasubramanian Thiagarajan

    2012-12-01

    Full Text Available This article attempts to unravel the current scenario in online publishing. Advent of internet has brought with it tremendous changes in the publishing industry. What was hither to an industry dominated by publisher has been thrown open to one and sundry. Online publishing has brought with it a reach which was hitherto never been imagined. In the normal course it would take at least a year to publish a manuscript. Online publishing has managed to bring this time down to a few weeks / at most a month. This article attempts to discusses the positives and perils of online publishing scenario.

  17. Online shopping hesitation.

    Science.gov (United States)

    Cho, Chang-Hoan; Kang, Jaewon; Cheon, Hongsik John

    2006-06-01

    This study was designed to understand which factors influence consumer hesitation or delay in online product purchases. The study examined four groups of variables (i.e., consumer characteristics, contextual factors perceived uncertainty factors, and medium/channel innovation factors) that predict three types of online shopping hesitation (i.e., overall hesitation, shopping cart abandonment, and hesitation at the final payment stage). We found that different sets of delay factors are related to different aspects of online shopping hesitation. The study concludes with suggestion for various delay-reduction devices to help consumers close their online decision hesitation.

  18. Observation of online communities

    DEFF Research Database (Denmark)

    Nørskov, Sladjana V.; Rask, Morten

    2011-01-01

    This paper addresses the application of observation to online settings with a special focus on observer roles. It draws on a study of online observation of a virtual community, i.e. an open source software (OSS) community. The paper examines general and specific advantages and disadvantages...... of the observer roles in online settings by relating these roles to the same roles assumed in offline settings. The study suggests that under the right circumstances online and offline observation may benefit from being combined as they complement each other well. Quality issues and factors important to elicit...

  19. Online Shopping Woes

    Institute of Scientific and Technical Information of China (English)

    Hou Weili

    2011-01-01

    AS a frequent online shopper,Zhou Fangjie,a 28-year-old white-collar worker,was annoyed when she could not open Hanyidushe,an online shop selling Korean-style clothing on Taobao Mall.Her experience resulted from the online protest initiated by small vendors on Taobao Mall,China's largest business to consumer online platform.Thousands of small vendors started the protest against larger established vendors by discrediting them through False orders,forming an anti-Taobao Union and setting up a chat room to devise ways to disrupt operations on Taobao Mall.

  20. Online organic chemistry

    Science.gov (United States)

    Janowicz, Philip A.

    This is a comprehensive study of the many facets of an entirely online organic chemistry course. Online homework with structure-drawing capabilities was found to be more effective than written homework. Online lecture was found to be just as effective as in-person lecture, and students prefer an online lecture format with shorter Webcasts. Online office hours were found to be effective, and discussion sessions can be placed online as well. A model was created that explains 36.1% of student performance based on GPA, ACT Math score, grade in previous chemistry course, and attendance at various forms of discussion. Online exams have been created which test problem-solving skills and is instantly gradable. In these exams, students can submit answers until time runs out for different numbers of points. These facets were combined effectively to create an entirely online organic chemistry course which students prefer over the in-person alternative. Lastly, there is a vision for where online organic chemistry is going and what can be done to improve education for all.

  1. Detailed Analysis of Motor Unit Activity

    DEFF Research Database (Denmark)

    Nikolic, Mile; Sørensen, John Aasted; Dahl, Kristian

    1997-01-01

    System for decomposition of EMG signals intotheir constituent motor unit potentials and their firing patterns.The aim of the system is detailed analysis ofmotor unit variability.......System for decomposition of EMG signals intotheir constituent motor unit potentials and their firing patterns.The aim of the system is detailed analysis ofmotor unit variability....

  2. Stiilne detail vanalinnas / Jüri Kuuskemaa

    Index Scriptorium Estoniae

    Kuuskemaa, Jüri, 1942-

    2000-01-01

    Näitus Rotermanni soolalaos "Stiilne detail vanalinnas" esitab detaile, mis on ilmestanud Tallinna siluetti (tuulelipud), tänavapilti (lukusiltidest ja uksekoputitest pühakuorvakujudeni) ja tubasid (akna käepidemest ahjukahlite, põrandaplaatide, toauste, stukk- ja kivireljeefideni). Kuraator J. Kuuskemaa, kujundaja M. Agabush.

  3. Detailed Analysis of Motor Unit Activity

    DEFF Research Database (Denmark)

    Nikolic, Mile; Sørensen, John Aasted; Dahl, Kristian

    1997-01-01

    System for decomposition of EMG signals intotheir constituent motor unit potentials and their firing patterns.The aim of the system is detailed analysis ofmotor unit variability.......System for decomposition of EMG signals intotheir constituent motor unit potentials and their firing patterns.The aim of the system is detailed analysis ofmotor unit variability....

  4. Understanding brains: details, intuition, and big data.

    Directory of Open Access Journals (Sweden)

    Eve Marder

    2015-05-01

    Full Text Available Understanding how the brain works requires a delicate balance between the appreciation of the importance of a multitude of biological details and the ability to see beyond those details to general principles. As technological innovations vastly increase the amount of data we collect, the importance of intuition into how to analyze and treat these data may, paradoxically, become more important.

  5. Magnetic Resonance Imaging (MRI) -- Head

    Medline Plus

    Full Text Available ... produce detailed pictures of the brain and other cranial structures that are clearer and more detailed than ... cases. MR images of the brain and other cranial structures are clearer and more detailed than with ...

  6. Photothermal imaging

    Science.gov (United States)

    Lapotko, Dmitry; Antonishina, Elena

    1995-02-01

    An automated image analysis system with two imaging regimes is described. Photothermal (PT) effect is used for imaging of a temperature field or absorption structure of the sample (the cell) with high sensitivity and spatial resolution. In a cell study PT-technique enables imaging of live non-stained cells, and the monitoring of the cell shape/structure. The system includes a dual laser illumination unit coupled to a conventional optical microscope. A sample chamber provides automated or manual loading of up to 3 samples and cell positioning. For image detection a 256 X 256 10-bit CCD-camera is used. The lasers, scanning stage, and camera are controlled by PC. The system provides optical (transmitted light) image, probe laser optical image, and PT-image acquisition. Operation rate is 1 - 1.5 sec per cell for a cycle: cell positioning -- 3 images acquisition -- image parameters calculation. A special database provides image/parameters storage, presentation, and cell diagnostic according to quantitative image parameters. The described system has been tested during live and stained blood cell studies. PT-images of the cells have been used for cell differentiation. In experiments with the red blood cells (RBC) that originate from normal and anaemia blood parameters for disease differentiation have been found. For white blood cells in PT-images the details of cell structure have found that absent in their optical images.

  7. Imaging Biomarkers or Biomarker Imaging?

    Directory of Open Access Journals (Sweden)

    Markus Mitterhauser

    2014-06-01

    Full Text Available Since biomarker imaging is traditionally understood as imaging of molecular probes, we highly recommend to avoid any confusion with the previously defined term “imaging biomarkers” and, therefore, only use “molecular probe imaging (MPI” in that context. Molecular probes (MPs comprise all kinds of molecules administered to an organism which inherently carry a signalling moiety. This review highlights the basic concepts and differences of molecular probe imaging using specific biomarkers. In particular, PET radiopharmaceuticals are discussed in more detail. Specific radiochemical and radiopharmacological aspects as well as some legal issues are presented.

  8. Consumers' Online Brand Endorsements

    NARCIS (Netherlands)

    Bernritter, S.F.; Verlegh, P.W.J.; Smit, E.G.; De Pelsmacker, P.

    2016-01-01

    Abstract Purpose and Approach This Chapter has three central goals: First, it aims to introduce the concept of consumers’ online brand endorsements, which we define as consumers’ intentional, public, and positive online affiliations with brands (e.g., liking a brand page on Facebook). Second, it pro

  9. Framework for online teaching

    DEFF Research Database (Denmark)

    Strobel, Bjarne W.

    2014-01-01

    The following framework for online teaching is a guidance to inspire you on how to to use e-learning in your teaching. Maybe you want to make a whole online course (distance learning) or maybe you want to use e-learning as a part of a course (blended learning). If you want to go further or have...

  10. StuDIY Online

    DEFF Research Database (Denmark)

    2015-01-01

    StuDIY Online er kurser i akademisk argumentation, problemformulering, analyse og akademisk sprog. Kurserne er frit tilgængelige for alle via Blackboard på AU......StuDIY Online er kurser i akademisk argumentation, problemformulering, analyse og akademisk sprog. Kurserne er frit tilgængelige for alle via Blackboard på AU...

  11. Consumers' Online Brand Endorsements

    NARCIS (Netherlands)

    Bernritter, S.F.; Verlegh, P.W.J.; Smit, E.G.; De Pelsmacker, P.

    2016-01-01

    Purpose and Approach This Chapter has three central goals: First, it aims to introduce the concept of consumers’ online brand endorsements, which we define as consumers’ intentional, public, and positive online affiliations with brands (e.g., liking a brand page on Facebook). Second, it provides an

  12. Online Reading Test Evaluation

    Institute of Scientific and Technical Information of China (English)

    雷鸣

    2011-01-01

    Language test has been used as a scientific assessment tool in providing valuable information for teaching and learning. In fact,lots of online reading tests are not designed with validity. This paper analyzes those online reading tests from the aspects o

  13. Online consumer contracts

    NARCIS (Netherlands)

    Luzak, J.

    2014-01-01

    The new Consumer Rights Directive introduced some changes to the level of consumers’ protection online. However, just like with its predecessor, the Distance Selling Directive, the main focus of the protection that consumers have been granted online is to provide them with transparent and salient

  14. Consumers' Online Brand Endorsements

    NARCIS (Netherlands)

    Bernritter, S.F.; Verlegh, P.W.J.; Smit, E.G.; De Pelsmacker, P.

    2016-01-01

    Purpose and Approach This Chapter has three central goals: First, it aims to introduce the concept of consumers’ online brand endorsements, which we define as consumers’ intentional, public, and positive online affiliations with brands (e.g., liking a brand page on Facebook). Second, it provides an

  15. Online Readiness Rijscholen 2013

    NARCIS (Netherlands)

    Weltevreden, J.W.J.; Boels, D.H.H.

    2013-01-01

    In dit onderzoek is de online readiness van rijscholen in 2013 in kaart gebracht. In totaal hebben 115 rijscholen deelgenomen aan het onderzoek. Het onderzoek is uitgevoerd door het lectoraat Online Ondernemen samen met studenten van de minor Marketing Tomorrow van de Hogeschool van Amsterdam.

  16. Framework for online teaching

    DEFF Research Database (Denmark)

    Strobel, Bjarne W.

    2014-01-01

    The following framework for online teaching is a guidance to inspire you on how to to use e-learning in your teaching. Maybe you want to make a whole online course (distance learning) or maybe you want to use e-learning as a part of a course (blended learning). If you want to go further or have...

  17. Online Advertising in Social Networks

    Science.gov (United States)

    Bagherjeiran, Abraham; Bhatt, Rushi P.; Parekh, Rajesh; Chaoji, Vineet

    Online social networks offer opportunities to analyze user behavior and social connectivity and leverage resulting insights for effective online advertising. This chapter focuses on the role of social network information in online display advertising.

  18. ONLINE READING COMPREHENSION: CHALLENGES AND OPPORTUNITIES

    Directory of Open Access Journals (Sweden)

    Julie Coiro/

    2014-12-01

    Full Text Available This paper details a number of challenges and opportunities for today’s learners when reading for information on the Internet. After defining online reading comprehension from a new literacies perspective and how it appears to be different than offline reading comprehension, I highlight details about four of the biggest challenges for today’s learners. These include 1 understanding and becoming proficient with the new literacy skills and practices needed for online research; 2 developing a special kind of digital wisdom that focuses on learning how to learn with the Internet; 3 taking on new roles in a digital culture that expects learners to actively participate and contribute with new knowledge as a member of their community; and 4 developing positive attitudes toward using the Internet for academic work. The second part of the paper shares examples of how skilled online readers can use the steps of online inquiry to think more deeply about topics that interest them; develop a personal voice as they share ideas with others; and work collaboratively to build meaning and new digital products that enable them to make a difference in their world, or matter. You can explore the research and resources from this presentation in more depth at .

  19. ONLINE PORNOGRAPHY AND SEXUALITY: SOME RESULTS OF EU KIDS ONLINE SURVEY II IN THE ROMANIAN CASE

    Directory of Open Access Journals (Sweden)

    VALENTINA MARINESCU

    2014-05-01

    Full Text Available The present article intends to analyze the exposure of Romanian children and teens to sexually explicit message and the so-called „sexting” activities they perform in the online environment. The main research topic to which we try to find some answers is: are young people more exposed to risks because they view sexually explicit content online and send sexual messages to others? Our results validate the risk migration hypothesis, the blurring boundaries between the online and offline worlds enabling the migration of risk from the real world to the internet and the reverse. At the same time, the date of EU Kinds Online II validate the vulnerability hypothesis, according to which the harm declared by the children following the exposure to sexually explicit images and the receiving the sexual messages is the result of their socio-demographic vulnerabilities

  20. Post Entitlement Management Information - Detail Database

    Data.gov (United States)

    Social Security Administration — Contains data that supports the detailed and aggregate receipt, pending and clearance data, as well as other strategic and tactical MI for many Title II and Title...

  1. On detailed 3D reconstruction of large indoor environments

    Science.gov (United States)

    Bondarev, Egor

    2015-03-01

    In this paper we present techniques for highly detailed 3D reconstruction of extra large indoor environments. We discuss the benefits and drawbacks of low-range, far-range and hybrid sensing and reconstruction approaches. The proposed techniques for low-range and hybrid reconstruction, enabling the reconstruction density of 125 points/cm3 on large 100.000 m3 models, are presented in detail. The techniques tackle the core challenges for the above requirements, such as a multi-modal data fusion (fusion of a LIDAR data with a Kinect data), accurate sensor pose estimation, high-density scanning and depth data noise filtering. Other important aspects for extra large 3D indoor reconstruction are the point cloud decimation and real-time rendering. In this paper, we present a method for planar-based point cloud decimation, allowing for reduction of a point cloud size by 80-95%. Besides this, we introduce a method for online rendering of extra large point clouds enabling real-time visualization of huge cloud spaces in conventional web browsers.

  2. Online Sellers’ Website Quality Influencing Online Buyers’ Purchase Intention

    Science.gov (United States)

    Shea Lee, Tan; Ariff, Mohd Shoki Md; Zakuan, Norhayati; Sulaiman, Zuraidah; Zameri Mat Saman, Muhamad

    2016-05-01

    The increase adoption of Internet among young users in Malaysia provides high prospect for online seller. Young users aged between 18 and 25 years old are important to online sellers because they are actively involved in online purchasing and this group of online buyers is expected to dominate future online market. Therefore, examining online sellers’ website quality and online buyers’ purchase intention is crucial. Based on the Theory of planned behavior (TPB), a conceptual model of online sellers’ website quality and purchase intention of online buyers was developed. E-tailQ instrument was adapted in this study which composed of website design, reliability/fulfillment, security, privacy & trust, and customer service. Using online questionnaire and convenience sampling procedure, primary data were obtained from 240 online buyers aged between 18 to 25 years old. It was discovered that website design, website reliability/fulfillment, website security, privacy & trust, and website customer service positively and significantly influence intention of online buyers to continuously purchase via online channels. This study concludes that online sellers’ website quality is important in predicting online buyers’ purchase intention. Recommendation and implication of this study were discussed focusing on how online sellers should improve their website quality to stay competitive in online business.

  3. PlanetServer: Innovative approaches for the online analysis of hyperspectral satellite data from Mars

    Science.gov (United States)

    Oosthoek, J. H. P.; Flahaut, J.; Rossi, A. P.; Baumann, P.; Misev, D.; Campalani, P.; Unnithan, V.

    2014-06-01

    PlanetServer is a WebGIS system, currently under development, enabling the online analysis of Compact Reconnaissance Imaging Spectrometer (CRISM) hyperspectral data from Mars. It is part of the EarthServer project which builds infrastructure for online access and analysis of huge Earth Science datasets. Core functionality consists of the rasdaman Array Database Management System (DBMS) for storage, and the Open Geospatial Consortium (OGC) Web Coverage Processing Service (WCPS) for data querying. Various WCPS queries have been designed to access spatial and spectral subsets of the CRISM data. The client WebGIS, consisting mainly of the OpenLayers javascript library, uses these queries to enable online spatial and spectral analysis. Currently the PlanetServer demonstration consists of two CRISM Full Resolution Target (FRT) observations, surrounding the NASA Curiosity rover landing site. A detailed analysis of one of these observations is performed in the Case Study section. The current PlanetServer functionality is described step by step, and is tested by focusing on detecting mineralogical evidence described in earlier Gale crater studies. Both the PlanetServer methodology and its possible use for mineralogical studies will be further discussed. Future work includes batch ingestion of CRISM data and further development of the WebGIS and analysis tools.

  4. Sexual Problems among Japanese Women: Data from an Online Helpline

    Directory of Open Access Journals (Sweden)

    Yumi Ozaki, MD, PhD

    2015-12-01

    Conclusion: Sexual aversion was the most common sexual problem among Japanese women who sought help via the online helpline. Family structure was related to sexual problems. More detailed assessments of family structure may be important in better identifying the triggering causes of the reported sexual problems. Ozaki Y, Nagao K, Saigo R, Tai T, Tanaka N, Kobayashi H, Nakajima K, and Takahashi Y. Sexual problems among Japanese women: Data from an online helpline. Sex Med 2015;3:289–295.

  5. Developing Online Oceanography at UCSB

    Science.gov (United States)

    Prothero, W. A.; Dodson, H.

    2001-12-01

    Oceanography at UCSB is an introductory general education science course taken by up to 200 students per quarter. The emphasis is on learning science process by engaging in authentic science activities that use real earth data. Recently, to increase student motivation, the course has been modified to include an Earth Summit framework. The online support being developed for this course is the first step in the creation of a completely online oceanography class. Foundation software was first tested in the class during Spring 2001. Online activities that are supported are writing and instructor feedback, online threaded discussion with live chat and graphics, automatically graded homeworks and games, auto graded quizzes with questions randomly selected from a database, and thought problems graded by the instructor(s). Future plans include integration with commercial course management software. To allow choice of assignments, all course activities totaled110%. Since grades were based on A=90-100, B=80-90, C= 70-80, etc, it was possible to get a better than A grade. Students see the effect (on their grade) of each assignment by calculating their current course grade. Course activities included (most of which are automatically graded): weekly lab homeworks, weekly mini-quizzes (10 multiple choice questions selected at random from a topic database), weekly thought questions (graded by the TA), 3 written assignments, and "Question of the Day" from lecture (credit given for handing it in), The online writing software allowed students to enter their writing, edit and link to graphic images, print the paper, and electronically hand it in. This has the enormous advantage of allowing the instructor and TA's convenient access to all student papers. At the end of the course, students were asked how effective each of the course activities were in learning the course material. On a five point scale, ranging from highest contribution to lowest, the percentage of students giving

  6. Cortical thickness abnormalities in late adolescence with online gaming addiction.

    Directory of Open Access Journals (Sweden)

    Kai Yuan

    Full Text Available Online gaming addiction, as the most popular subtype of Internet addiction, had gained more and more attention from the whole world. However, the structural differences in cortical thickness of the brain between adolescents with online gaming addiction and healthy controls are not well unknown; neither was its association with the impaired cognitive control ability. High-resolution magnetic resonance imaging scans from late adolescence with online gaming addiction (n = 18 and age-, education- and gender-matched controls (n = 18 were acquired. The cortical thickness measurement method was employed to investigate alterations of cortical thickness in individuals with online gaming addiction. The color-word Stroop task was employed to investigate the functional implications of the cortical thickness abnormalities. Imaging data revealed increased cortical thickness in the left precentral cortex, precuneus, middle frontal cortex, inferior temporal and middle temporal cortices in late adolescence with online gaming addiction; meanwhile, the cortical thicknesses of the left lateral orbitofrontal cortex (OFC, insula, lingual gyrus, the right postcentral gyrus, entorhinal cortex and inferior parietal cortex were decreased. Correlation analysis demonstrated that the cortical thicknesses of the left precentral cortex, precuneus and lingual gyrus correlated with duration of online gaming addiction and the cortical thickness of the OFC correlated with the impaired task performance during the color-word Stroop task in adolescents with online gaming addiction. The findings in the current study suggested that the cortical thickness abnormalities of these regions may be implicated in the underlying pathophysiology of online gaming addiction.

  7. Cortical thickness abnormalities in late adolescence with online gaming addiction.

    Science.gov (United States)

    Yuan, Kai; Cheng, Ping; Dong, Tao; Bi, Yanzhi; Xing, Lihong; Yu, Dahua; Zhao, Limei; Dong, Minghao; von Deneen, Karen M; Liu, Yijun; Qin, Wei; Tian, Jie

    2013-01-01

    Online gaming addiction, as the most popular subtype of Internet addiction, had gained more and more attention from the whole world. However, the structural differences in cortical thickness of the brain between adolescents with online gaming addiction and healthy controls are not well unknown; neither was its association with the impaired cognitive control ability. High-resolution magnetic resonance imaging scans from late adolescence with online gaming addiction (n = 18) and age-, education- and gender-matched controls (n = 18) were acquired. The cortical thickness measurement method was employed to investigate alterations of cortical thickness in individuals with online gaming addiction. The color-word Stroop task was employed to investigate the functional implications of the cortical thickness abnormalities. Imaging data revealed increased cortical thickness in the left precentral cortex, precuneus, middle frontal cortex, inferior temporal and middle temporal cortices in late adolescence with online gaming addiction; meanwhile, the cortical thicknesses of the left lateral orbitofrontal cortex (OFC), insula, lingual gyrus, the right postcentral gyrus, entorhinal cortex and inferior parietal cortex were decreased. Correlation analysis demonstrated that the cortical thicknesses of the left precentral cortex, precuneus and lingual gyrus correlated with duration of online gaming addiction and the cortical thickness of the OFC correlated with the impaired task performance during the color-word Stroop task in adolescents with online gaming addiction. The findings in the current study suggested that the cortical thickness abnormalities of these regions may be implicated in the underlying pathophysiology of online gaming addiction.

  8. Bayesian online compressed sensing

    Science.gov (United States)

    Rossi, Paulo V.; Kabashima, Yoshiyuki; Inoue, Jun-ichi

    2016-08-01

    In this paper, we explore the possibilities and limitations of recovering sparse signals in an online fashion. Employing a mean field approximation to the Bayes recursion formula yields an online signal recovery algorithm that can be performed with a computational cost that is linearly proportional to the signal length per update. Analysis of the resulting algorithm indicates that the online algorithm asymptotically saturates the optimal performance limit achieved by the offline method in the presence of Gaussian measurement noise, while differences in the allowable computational costs may result in fundamental gaps of the achievable performance in the absence of noise.

  9. The Truth About the Internet and Online Predators

    CERN Document Server

    Dingwell, Heath; Peterson, Fred L

    2011-01-01

    To help readers avoid and recognize risky behaviors, The Truth About the Internet and Online Predators explains many of the dangers associated with the Internet. The A-to-Z entries detail the social, legal, and personal risks of Internet use, while personal testimonies and question-and-answer sections provide readers with an inside look at common issues online. Entries include:. Bullies and cyberbullying. Characteristics of online predators. Chat rooms and instant messaging. Internet safety. Parental control. Peers and peer pressure. Phishing and pharming. Privacy issues. Social networking Web

  10. Unwanted online sexual solicitation and online sexual risk behavior

    NARCIS (Netherlands)

    Baumgartner, S.E.; Valkenburg, P.M.; Peter, J.; Yan, Z.

    2012-01-01

    In recent years, there have been growing concerns about online sexual solicitations and online sexual risk behaviors. Recent studies suggest that only a minority of adolescents is confronted with online sexual solicitations or engages in online sexual risk behavior. Whereas more girls encounter

  11. Online Learning Community and its Application in the Occupational Training of College Teachers

    Directory of Open Access Journals (Sweden)

    Huang Xiu Guo

    2016-01-01

    Full Text Available Object: The analysis of established online learning community, and its structural elements and creation strategies can shed light on the effect of the application of online learning community in the occupational training of college teachers. Methods: detailed analysis of the existing successful online Teacher learning communities like the Wired for Learning and the online learning community established by Beijing Normal University. Conclusion: Traditional learning community took place in a specific physical environment, whose members and resources are limited by the physical environment. Online learning community can help solve many of the existing problems in traditional training and opened new possibilities for occupational training

  12. Making detailed predictions makes (some) predictions worse

    Science.gov (United States)

    Kelly, Theresa F.

    In this paper, we investigate whether making detailed predictions about an event makes other predictions worse. Across 19 experiments, 10,895 participants, and 415,960 predictions about 724 professional sports games, we find that people who made detailed predictions about sporting events (e.g., how many hits each baseball team would get) made worse predictions about more general outcomes (e.g., which team would win). We rule out that this effect is caused by inattention or fatigue, thinking too hard, or a differential reliance on holistic information about the teams. Instead, we find that thinking about game-relevant details before predicting winning teams causes people to give less weight to predictive information, presumably because predicting details makes information that is relatively useless for predicting the winning team more readily accessible in memory and therefore incorporated into forecasts. Furthermore, we show that this differential use of information can be used to predict what kinds of games will and will not be susceptible to the negative effect of making detailed predictions.

  13. DETAILED MODELLING OF CHARGING BEHAVIOUR OF SMART SOLAR TANKS

    DEFF Research Database (Denmark)

    Fan, Jianhua; Andersen, Elsa; Furbo, Simon

    2010-01-01

    The charging behaviour of smart solar tanks for solar combisystems for one-family houses is investigated with detailed Computational Fluid Dynamics (CFD) modelling and Particle Image Velocimetry (PIV) measurements. The smart solar tank can be charged with a variable auxiliary volume fitted...... to the expected future energy demand. Therefore the heat loss from the tank is decreased and the thermal performance of the solar heating system is increased compared to a traditional system with a fixed auxiliary volume. The solar tank can be charged either by an electric heating element situated in the tank...... or by an electric heating element in a side-arm mounted on the side of the tank. Detailed CFD models of the smart tanks are built with different mesh densities in the tank and in the side-arm. The thermal conditions of the tank during charging are calculated with the CFD models. The fluid flow and temperature...

  14. DETAILED MODELLING OF CHARGING BEHAVIOUR OF SMART SOLAR TANKS

    DEFF Research Database (Denmark)

    Fan, Jianhua; Andersen, Elsa; Furbo, Simon

    The charging behaviour of smart solar tanks for solar combisystems for one-family houses is investigated with detailed Computational Fluid Dynamics (CFD) modelling and Particle Image Velocimetry (PIV) measurements. The smart solar tank can be charged with a variable auxiliary volume fitted...... to the expected future energy demand. Therefore the heat loss from the tank is decreased and the thermal performance of the solar heating system is increased compared to a traditional system with a fixed auxiliary volume. The solar tank can be charged either by an electric heating element situated in the tank...... or by an electric heating element in a side-arm mounted on the side of the tank. Detailed CFD models of the smart tanks are built with different mesh densities in the tank and in the side-arm. The thermal conditions of the tank during charging are calculated with the CFD models. The fluid flow and temperature...

  15. Fatigue-Prone Details in Steel Bridges

    Directory of Open Access Journals (Sweden)

    Mohsen Heshmati

    2012-11-01

    Full Text Available This paper reviews the results of a comprehensive investigation including more than 100 fatigue damage cases, reported for steel and composite bridges. The damage cases are categorized according to types of detail. The mechanisms behind fatigue damage in each category are identified and studied. It was found that more than 90% of all reported damage cases are of deformation-induced type and generated by some kind of unintentional or otherwise overlooked interaction between different load-carrying members or systems in the bridge. Poor detailing, with unstiffened gaps and abrupt changes in stiffness at the connections between different members were also found to contribute to fatigue cracking in many details.

  16. Memory for details with self-referencing.

    Science.gov (United States)

    Serbun, Sarah J; Shih, Joanne Y; Gutchess, Angela H

    2011-11-01

    Self-referencing benefits item memory, but little is known about the ways in which referencing the self affects memory for details. Experiment 1 assessed whether the effects of self-referencing operate only at the item, or general, level or whether they also enhance memory for specific visual details of objects. Participants incidentally encoded objects by making judgements in reference to the self, a close other (one's mother), or a familiar other (Bill Clinton). Results indicate that referencing the self or a close other enhances both specific and general memory. Experiments 2 and 3 assessed verbal memory for source in a task that relied on distinguishing between different mental operations (internal sources). The results indicate that self-referencing disproportionately enhances source memory, relative to conditions referencing other people, semantic, or perceptual information. We conclude that self-referencing not only enhances specific memory for both visual and verbal information, but can also disproportionately improve memory for specific internal source details.

  17. Theatrically Digital: Education and Online Identity

    Directory of Open Access Journals (Sweden)

    Nastaran Khoshsabk

    2017-08-01

    Full Text Available The dramaturgical aspects of using social media are applied in this study from a sociological perspective (Goffman, 1959 to describe the process of gaining a sense of self through learning in online-environments. The exploration of data in this qualitative case study sheds light on the theatrical dimension of virtual self-presentation which can encourage individuals to become engaged in interacting online and, in the process of doing so, learn actively though using social media via its unique audio-visual digital content. Social media tools provide a space for information sharing to fill the gaps when students are unwilling to communicate in face-to-face classrooms because of a particular socio-cultural context. The codes and themes from six months’ Facebook analysis of adult social media users were analysed based on the self-representation of the digital self with relation to their language and cultural background and its influence on the formation of identity. The ‘actual self’, as described in interviews, was being manipulated by individuals for different reasons such as its influence on their social/cultural identity and the development of the self-image. Increasingly, educators in all educational domains are using online social media platforms to support engagement in teaching and learning. It is hoped that this research, by offering increased understanding of the importance of online-communities, will have implications for learning from online contexts, particularly in contexts with socio-cultural boundaries.

  18. System for Online Conference Discussion on Medical Images and Data%用于医学影像和数据的远程医学会诊系统

    Institute of Scientific and Technical Information of China (English)

    DIMITER C. Dimitrov

    2007-01-01

    A system for on-line conference discussion on medical images and data is described in the paper. It can be used not only for real distance medical consultations in the area of eHealth, but for distance education and self-testing-eLearning in information engineering and medicine, too. The program realization is on Java language,which transfers this software in independent platform. To use this product, a platform with Java virtual machine,connected in LAN or INTERNET, is required. It means that the possibilities of usage are on computers, which work with one of the operating systems: Windows 3.1, Windows 9x, Windows NT, Windows 2000, Windows XP, MacOS, OS/2, HPUX, Hitachi OS, AIX, Irix, Solaris, UnixWare, Linux, Non-Stop Kernel, NetWare 4.0 or MVS.The main results are connected with software realization.%描述了一种用于医学图像和数据的在线会议讨论系统.该系统不仅可用于电子健康(eHealth)领域中的实时远距离医学会诊,还可用于信息工程和医学中的远程教育和自测试在线学习(eLearning).该软件的实现是基于独立于操作平台的JAVA语言,使用这个产品只要在系统平台上安装有连接到局域网(LAN)和INTERNET的JAVA虚拟机,这也就意味着它允许在装有操作系统Windows 3.1,Windows 9x,Windows NT,Windows 2000,Windows XP,MacOS,OS/2,HPUX,Hitachi OS,AIX,Irix,Solaris,UnixWare,Linux,Non-Stop Kernel,NetWare 4.0或者MVS的计算机上使用.文章的主要结果是完成该系统软件实现.

  19. The Online Bookstore

    Directory of Open Access Journals (Sweden)

    Zhai Yunkai

    2017-01-01

    Full Text Available Nowadays, the network plays an import role in people’s life. In the process of the improvement of the people’s living standard, people’s demands of the life’s quality and efficiency is more higher, the traditional bookstore’s inconvenience gradually emerge, and the online bookstore has gradually be used in public. The online bookstore is a revolution of book industry. The traditional bookstores’ operation time, address and space is limited, so the types of books and books to find received a degree of restriction. But the online bookstore broke the management mode of traditional bookstore, as long as you have a computer, you can buy the book anywhere, saving time and effort, shortening the time of book selection link effectively. The online bookstore system based on the principle of provides convenience and service to people.

  20. Online learning for all.

    Science.gov (United States)

    Doherty, Simon

    2015-05-30

    Last year, Simon Doherty, president of the North of Ireland Veterinary Association and the BVA's NI Branch, completed a number of MOOCs (massive open online courses) having read about them in Vet Record Careers; here, he describes his experiences.

  1. Varieties of online gatekeeping

    DEFF Research Database (Denmark)

    Nielsen, Rasmus Kleis

    News media organizations like newspapers and broadcasters have long functioned as gatekeepers between news and audiences, but with the rise of digital media, the search engines and social networking sites that are central to how most people navigate online increasingly complement news media......) and where non-journalistic actors too serve as gates between news and audiences. In this paper, I adopt such a broader approach and outline three varieties of online gatekeeping that each integrate different technologies in the gatekeeping process, but do so in different ways and for different purposes...... media websites remain amongst the most important gateways to news online. But they are increasingly supplemented by other, second-order online gatekeepers like search engines and social networking sites that, while rarely producing original content defined as “news”, increasingly serve as alternative...

  2. Conserveermiddelen on-line

    NARCIS (Netherlands)

    Top, J.L.; Ketelaars, N.J.J.P.; Hulzebos, J.L.

    2004-01-01

    Antimicrobials Online is een Engelstalige database die wetenschappelijke informatie over natuurlijke conserveermiddelen via internet beschikbaar stelt aan de levensmiddelenindustrie. Het project is uitgevoerd door Wageningen UR-Agrotechnology & Food Innovations. Er volgt uitbreiding met traditio

  3. Doing recovery online.

    Science.gov (United States)

    Mudry, Tanya E; Strong, Tom

    2013-03-01

    Although problem gambling is becoming more prevalent, research shows that many problem gamblers do not seek help. Online social support forums have become an increasingly popular option for receiving support for problem gambling. Few researchers have explored how participants within these forums interact, or what is supportive about participation in online communities. Melding netnography (ethnographic approaches online), discourse analysis, and ethnomethodology, we analyzed the discursive interactions of self-identified problem gamblers on an online forum. We report on the characteristics of this unique setting, the common discourses that members used, and how they discursively accomplished various interactional tasks, including constructing identities, and negotiating membership, legitimacy, and support. We conclude with recommendations for practitioners and researchers interested in better understanding people trying to overcome problem gambling and other behavioral concerns.

  4. Exploring Online Purchasing.

    Science.gov (United States)

    Fickes, Michael

    2001-01-01

    Examines the setup of American University's electronic procurement system and explains how it works and the benefits it brings to the school. Cautionary advice on setting up an online purchasing system is also offered. (GR)

  5. Conserveermiddelen on-line

    NARCIS (Netherlands)

    Top, J.L.; Ketelaars, N.J.J.P.; Hulzebos, J.L.

    2004-01-01

    Antimicrobials Online is een Engelstalige database die wetenschappelijke informatie over natuurlijke conserveermiddelen via internet beschikbaar stelt aan de levensmiddelenindustrie. Het project is uitgevoerd door Wageningen UR-Agrotechnology & Food Innovations. Er volgt uitbreiding met

  6. Detail in architecture: Between arts & crafts

    Science.gov (United States)

    Dulencin, Juraj

    2016-06-01

    Architectural detail represents an important part of architecture. Not only can it be used as an identifier of a specific building but at the same time enhances the experience of the realized project. Within it lie the signs of a great architect and clues to understanding his or her way of thinking. It is therefore the central topic of a seminar offered to architecture students at the Brno University of Technology. During the course of the semester-long class the students acquaint themselves with atypical architectural details of domestic and international architects by learning to read them, understand them and subsequently draw them by creating architectural blueprints. In other words, by general analysis of a detail the students learn theoretical thinking of its architect who, depending on the nature of the design, had to incorporate a variety of techniques and crafts. Students apply this analytical part to their own architectural detail design. The methodology of the seminar consists of experiential learning by project management and is complemented by a series of lectures discussing a diversity of details as well as materials and technologies required to implement it. The architectural detail design is also part of students' bachelors thesis, therefore, the realistic nature of their blueprints can be verified in the production process of its physical counterpart. Based on their own documentation the students choose the most suitable manufacturing process whether it is supplied by a specific technology or a craftsman. Students actively participate in the production and correct their design proposals in real scale with the actual material. A student, as a future architect, stands somewhere between a client and an artisan, materializes his or her idea and adjusts the manufacturing process so that the final detail fulfills aesthetic consistency and is in harmony with its initial concept. One of the very important aspects of the design is its economic cost, an

  7. Local address and emergency contact details

    CERN Multimedia

    2013-01-01

    The HR Department would like to remind members of the personnel that they are responsible for ensuring that their personal data concerning local address and preferred emergency contact details remains valid and up-to-date.   Both are easily accessible via the links below: Local address: https://edh.cern.ch/Document/Personnel/LocalAddressChange   Emergency contacts: https://edh.cern.ch/Document/Personnel/EC   Please take a few minutes to check your details and modify if necessary. Thank you in advance. HR Department Head Office

  8. TU Delft en online media

    NARCIS (Netherlands)

    Speekenbrink, R.J.H.

    2013-01-01

    Dit boek behandelt een visie op online media bij Nederlandse universiteiten. Daarbij beperk ik me tot die aspecten waarin online communicatie en/of online marketing een rol speelt. Dit boek behandelt niet de onderwijsgerelateerde aspecten van online media. Elektronische leeromgevingen, sociale medi

  9. TU Delft en online media

    NARCIS (Netherlands)

    Speekenbrink, R.J.H.

    2013-01-01

    Dit boek behandelt een visie op online media bij Nederlandse universiteiten. Daarbij beperk ik me tot die aspecten waarin online communicatie en/of online marketing een rol speelt. Dit boek behandelt niet de onderwijsgerelateerde aspecten van online media. Elektronische leeromgevingen, sociale medi

  10. TU Delft en online media

    NARCIS (Netherlands)

    Speekenbrink, R.J.H.

    2013-01-01

    Dit boek behandelt een visie op online media bij Nederlandse universiteiten. Daarbij beperk ik me tot die aspecten waarin online communicatie en/of online marketing een rol speelt. Dit boek behandelt niet de onderwijsgerelateerde aspecten van online media. Elektronische leeromgevingen, sociale

  11. Using online tone generators

    Science.gov (United States)

    2017-04-01

    Online tone generators are free, user friendly, and can make for engaging and meaningful study of many topics in the areas of interference, waves, and the physics of music. By using a website such as OnlineToneGenerator.com, and through opening multiple windows simultaneously, students can immediately perform several experiments. In this article, I highlight five lesson ideas that come naturally from these types of websites.

  12. Building online worlds

    DEFF Research Database (Denmark)

    Toft-Nielsen, Claus

    2013-01-01

    The fantasy genre has proven to be extremely durable in creating blockbuster successes across multiple media platforms, such as books, films, tabletop and especially online computer games. Currently 85 % of all Massively Multiplayer Online Role-Playing Games (MMORPGs) are situated in fantasy univ....... This paper will examine the genre function of fantasy drawing on both literary theory and computer game theory, through both textual analysis and reception analysis....

  13. Online Digital Trading

    Directory of Open Access Journals (Sweden)

    Felician Alecu

    2013-09-01

    Full Text Available This paper summarizes the main options a digital content creator has in order to obtain money by online trading of digital works. There are multiple ways to get paid for the digital products, like licensing, for example, however this article tries to present the most successful business models targeting the online market. The exclusive rights stated by the copyright laws are helping the authors to maximize to potential advantages coming from their digital creations.

  14. Suicidality, psychopathology, and the internet: Online time vs. online behaviors.

    Science.gov (United States)

    Harris, Keith M; Starcevic, Vladan; Ma, Jing; Zhang, Wei; Aboujaoude, Elias

    2017-09-01

    This study investigated whether several psychopathology variables, including suicidality, could predict the time people spend using the internet (hours online). Next, we examined a specific at-risk population (suicidal individuals) by their online behaviors, comparing suicidal individuals who went online for suicide-related purposes with suicidal individuals who did not go online for suicide-related purposes. An anonymous online sample of 713 (aged 18-71) reported hours online, psychiatric histories, and completed several standardized scales. After accounting for age and education, hierarchical regression modeling showed that the assessed psychopathology variables, including suicidality, did not explain significant variance in hours online. Hours online were better predicted by younger age, greater willingness to develop online relationships, higher perceived social support, higher curiosity, and lower extraversion. Suicidal participants, who did or did not go online for suicide-related purposes, did not differ on hours online. Multiple regression modeling showed that those who went online for suicide-related purposes were likely to be younger, more suicidal, and more willing to seek help from online mental health professionals. These findings revealed that hours online are not a valid indicator of psychopathology. However, studying online behaviors of specific at-risk groups could be informative and useful, including for suicide prevention efforts. Copyright © 2017. Published by Elsevier B.V.

  15. Gigantic Cosmic Corkscrew Reveals New Details About Mysterious Microquasar

    Science.gov (United States)

    2004-10-01

    Making an extra effort to image a faint, gigantic corkscrew traced by fast protons and electrons shot out from a mysterious microquasar paid off for a pair of astrophysicists who gained new insights into the beast's inner workings and also resolved a longstanding dispute over the object's distance. Microquasar SS 433 VLA Image of Microquasar SS 433 CREDIT: Blundell & Bowler, NRAO/AUI/NSF (Click on Image for Larger Version) The astrophysicists used the National Science Foundation's Very Large Array (VLA) radio telescope to capture the faintest details yet seen in the plasma jets emerging from the microquasar SS 433, an object once dubbed the "enigma of the century." As a result, they have changed scientists' understanding of the jets and settled the controversy over its distance "beyond all reasonable doubt," they said. SS 433 is a neutron star or black hole orbited by a "normal" companion star. The powerful gravity of the neutron star or black hole draws material from the stellar wind of its companion into an accretion disk of material tightly circling the dense central object prior to being pulled onto it. This disk propels jets of fast protons and electrons outward from its poles at about a quarter of the speed of light. The disk in SS 433 wobbles like a child's top, causing its jets to trace a corkscrew in the sky every 162 days. The new VLA study indicates that the speed of the ejected particles varies over time, contrary to the traditional model for SS 433. "We found that the actual speed varies between 24 percent to 28 percent of light speed, as opposed to staying constant," said Katherine Blundell, of the University of Oxford in the United Kingdom. "Amazingly, the jets going in both directions change their speeds simultaneously, producing identical speeds in both directions at any given time," Blundell added. Blundell worked with Michael Bowler, also of Oxford. The scientists' findings have been accepted by the Astrophysical Journal Letters. SS 433 New VLA

  16. New details emerge from the Einstein files

    CERN Multimedia

    Overbye, D

    2002-01-01

    For many years the FBI spied on Einstein. New details of this surveilance are emerging in "The Einstein File: J. Edgar Hoover's Secret War Against the World's Most Famous Scientist," by Fred Jerome, who sued the government with the help of the Public Citizen Litigation Group to obtain a less censored version of the file (1 page).

  17. Detailed Balancing and the Structure of Proton

    CERN Document Server

    Zhang, Y Z

    2001-01-01

    The protons are taken as an ensemble of Fock states. Using detailed balancing principle, ensemble density metrix on the basis of the number of partons is calculated, and so some information about intrinsic gluons and intrinsic sea quarks are gained without any parameter.

  18. Detailed numerical simulations of laser cooling processes

    Science.gov (United States)

    Ramirez-Serrano, J.; Kohel, J.; Thompson, R.; Yu, N.

    2001-01-01

    We developed a detailed semiclassical numerical code of the forces applied on atoms in optical and magnetic fields to increase the understanding of the different roles that light, atomic collisions, background pressure, and number of particles play in experiments with laser cooled and trapped atoms.

  19. Constructing Overview + Detail Dendrogram-Matrix Views

    Science.gov (United States)

    Chen, Jin; MacEachren, Alan M.; Peuquet, Donna J.

    2011-01-01

    A dendrogram that visualizes a clustering hierarchy is often integrated with a reorderable matrix for pattern identification. The method is widely used in many research fields including biology, geography, statistics, and data mining. However, most dendrograms do not scale up well, particularly with respect to problems of graphical and cognitive information overload. This research proposes a strategy that links an overview dendrogram and a detail-view dendrogram, each integrated with a re-orderable matrix. The overview displays only a user-controlled, limited number of nodes that represent the “skeleton” of a hierarchy. The detail view displays the sub-tree represented by a selected meta-node in the overview. The research presented here focuses on constructing a concise overview dendrogram and its coordination with a detail view. The proposed method has the following benefits: dramatic alleviation of information overload, enhanced scalability and data abstraction quality on the dendrogram, and the support of data exploration at arbitrary levels of detail. The contribution of the paper includes a new metric to measure the “importance” of nodes in a dendrogram; the method to construct the concise overview dendrogram from the dynamically-identified, important nodes; and measure for evaluating the data abstraction quality for dendrograms. We evaluate and compare the proposed method to some related existing methods, and demonstrating how the proposed method can help users find interesting patterns through a case study on county-level U.S. cervical cancer mortality and demographic data. PMID:19834151

  20. Gender Differences in the Factors Explaining Risky Behavior Online.

    Science.gov (United States)

    Sasson, Hagit; Mesch, Gustavo

    2016-05-01

    In searching for the social and cognitive antecedents of risky online behaviors, some studies have relied on the theory of planned behavior. According to the theory, three components serve as predictors of a given behavior-attitudes toward the behavior (beliefs that people hold about a given behavior), subjective norms (perceptions of what significant others think about the behavior) and perceived behavior control (perceptions about the ease or difficulty of engaging in a particular behavior). However, none of these studies considered the possibility that these factors work differently for boys and girls. We constructed models of the possible antecedents (attitudes, subjective norms and perceived behavior control) of risky behavior online and tested them using a representative sample of 495 sixth to eleventh grade students (46 % female) in a large city in Israel. We measured risky behavior online with items indicating the frequency of posting personal details, sending an insulting message and meeting face-to-face with a stranger met online. Structural equation modeling revealed that peers' subjective norms (beliefs that friends approve of engaging in risky online behaviors), parents' subjective norms (beliefs that parents accept involvement in risky online behaviors) and perceived behavior control were related to boys' risky behavior online, whereas for girls, only parents' subjective norms had such an association. Expanding the models to include other factors underscored that family factors were most strongly associated with girls' risky behavior online.

  1. A Prototype Design for Enhancing Customer Trust in Online Payments

    Directory of Open Access Journals (Sweden)

    Thair A. Dala’in

    2009-01-01

    Full Text Available Problem statement: The adoption of mobile device technology can contribute significantly to enhance customers trust in online payment systems. Approach: The perceptions and preferences of online shoppers are influenced by several key factors which serve to both enhance and compromise this trust and in turn affect a customer intentions and behavior in relation to use online payment systems. The first part of the research was a quantitative study to investigate these factors. In the second part of this research, a mobile payment model for online payment systems was proposed. In this model, the customers do not need to trust merchants during the transaction because merchants will not act as an intermediary between customers and the acquirer. Customers can therefore send their financial details without concern of disclosure, or potential misuse by the merchant. Results: In this study, the key factors influencing to adopt mobile payment systems were identify. The proposed model was developed and an analysis of the model architecture against conventional online payment systems was discussed. Conclusion/Recommendations: The significance of this research comes from providing a practical mobile payment model as a possible step towards increasing customer acceptance of online shopping and increasing their trust in online payment systems. The new model focuses on enhancing the feeling of security of the use of an online payment system and satisfying the security requirements.

  2. REMARKS ABOUT ONLINE ADVERTISING - A QUALITATIVE RESEARCH AMONG ROMANIAN PROFESSIONALS

    Directory of Open Access Journals (Sweden)

    Acatrinei Carmen

    2015-07-01

    Full Text Available In the online environment, the users have more control regarding what they want to see and this affects the advertising they are exposed to (due to the profiles created by the websites they have visited. Organizations can personalize the advertising campaigns designed at a higher level, to better meet the needs of the consumers. This paper offers an in-depth view about online advertising from 12 Romanian experts, who represent companies or digital advertising agencies and who employ this tool in order to promote themselves or to develop campaigns for their clients. The empirical research undertaken has a qualitative nature, semi-structured detailed interviews with the professionals have taken place in February-March 2015, in Bucharest. Online advertising was mostly defined by the specialists as being dynamic; and some of the attributes that characterizes this domain are measurability and personalization. Clear objectives settled, correct targeting of users, a well-established strategy and planning are the key elements that would lead to a successful online advertising campaign. The Romanian agencies offer integrated online advertising services, from research and market analysis to implementation and results’ assessment of the campaigns. The formats they have been using are: search, display, video, social media advertising, affiliated marketing and sponsorship. Most of the representatives interviewed suggest that their companies’ offers might / will change due to the dynamics of the medium. Online advertising helps the other online marketing tools perform better and develop the online presence of the companies. All the respondents have confirmed that following the introduction and great use of smartphones, their companies have adjusted the online advertising campaigns to better target the potential customers that use mobile devices. Most of the companies that invest in online advertising campaigns come from sectors such as: retail, telecom

  3. Degradative encryption: An efficient way to protect SPIHT compressed images

    Science.gov (United States)

    Xiang, Tao; Qu, Jinyu; Yu, Chenyun; Fu, Xinwen

    2012-11-01

    Degradative encryption, a new selective image encryption paradigm, is proposed to encrypt only a small part of image data to make the detail blurred but keep the skeleton discernible. The efficiency is further optimized by combining compression and encryption. A format-compliant degradative encryption algorithm based on set partitioning in hierarchical trees (SPIHT) is then proposed, and the scheme is designed to work in progressive mode for gaining a tradeoff between efficiency and security. Extensive experiments are conducted to evaluate the strength and efficiency of the scheme, and it is found that less than 10% data need to be encrypted for a secure degradation. In security analysis, the scheme is verified to be immune to cryptographic attacks as well as those adversaries utilizing image processing techniques. The scheme can find its wide applications in online try-and-buy service on mobile devices, searchable multimedia encryption in cloud computing, etc.

  4. 基于鲁棒信息滤波器的图像雅可比矩阵在线估计%Online Estimation of Image Jacobian Matrix Based on Robust Information Filter

    Institute of Scientific and Technical Information of China (English)

    张捷; 刘丁

    2011-01-01

    This paper reviews present mainstream uncalibrated estimations of image Jacobian matrix (UM) , and analyzes methods based on Kalman Filter, Fuzzy Adaptive Kalman Filter and Particle Filter, as well as their advantages and disadvantages in detail. In order to improve system estimation precision in unknown environment, this paper selects the estimation framework based on filtering theory, adjusts the system model, utilizes Robust Information Filter (RIF) to estimate IJM, and realizes moving-object-tracking accurately in simulation and industrial robot system respectively. RIF is robust to bounded noise with any distribution, both simulation and experimental results verify the effectiveness of the introduced method.%针对现有的图像雅可比矩阵无标定求解方法,分析了基于Kalman滤波、模糊自适应Kalman滤波和粒子滤波的图像雅可比矩阵在线估计的优缺点.为了进一步提高未知环境下的系统估计精度,选择基于滤波理论的估计框架,对系统模型进行调整,用鲁棒信息滤波器在线估计图像雅可比矩阵,该滤波算法对任意分布的有界噪声都具有较强的鲁棒性.仿真和实验结果表明,在未知系统噪声的情况下,该算法仍可以实现图像雅可比矩阵的精确估计.

  5. Manufacturing details by Neutron Radiography of Archaeological Pottery

    Energy Technology Data Exchange (ETDEWEB)

    Bernedo, Alfredo Victor Bellido; Latini, Rose Mary [Universidade Federal Fluminense (UFF), Niteroi, RJ (Brazil); Souza, Maria Ines Silvani; Vinagre Filho, Ubirajara Maribondo [Instituto de Engenharia Nuclear (IEN/CNEN-RJ), Rio de Janeiro, RJ (Brazil)

    2011-07-01

    Full text: The aim of the present work was to investigate manufacturing details of archaeological pot-sherds ceramics by Neutron Radiography. Pottery is perhaps the most important artefact found in excavation. Its archaeological importance relies on the fact that it can reveal cultural traditions and commercial influences in ancient communities. These pottery was recently discovered in archaeological earth circular structures sites in Acre state Brazil and the characteristics of clay used in their manufacture have been studied by modern scientific techniques such as Instrumental Neutron Activation Analysis (INAA), Thermoluminescence Dating and Moessbauer Spectroscopy. Different fragments of pottery were submitted to a neutron flux of the order of 10{sup 5}n.cm{sup -2}2:s{sup -1} for 3 minutes in the research reactor Argonauta at the Instituto de Engenharia Nuclear/CNEN. Digital processing techniques using imaging plate were applied to the image of the selected sample. The Neutrongraphy shows two different manufacturing details: palette and rollers. The fragment made by the technique of palette show a homogeneous mass and the neutrongraphy of ceramic fragments made by the technique of the rollers, pottery funeral, can be seen horizontal traces of the junction of rollers, overlapping, forming layers supported on each other. This technique allows you to create more stable structures. Thus, both the technique of the pallet as the roller can be characterized by Neutron Radiography. (author)

  6. Online self-disclosure and wellbeing of adolescents: A systematic literature review

    OpenAIRE

    Mubarak, Sameera; Rahamathulla, Mubarak Ali

    2016-01-01

    The present research investigated the extent of online self-disclosure (SD) of adolescents through a systematic decadal literature review. This review identified three major areas of research focus, with studies categorized mainly as: (1) factors contributing to online SD of adolescents; (2) risks and consequences of online SD; and (3) future directions of research and practical interventions to address the problems. A detailed examination of the variables covered by the studies indicated tha...

  7. Detailed gravimetric geoid computations in North America

    Science.gov (United States)

    Marsh, J. G.; Chang, E. S.

    1976-01-01

    A detailed gravimetric geoid has been computed for the Eastern United States and the Northwestern Atlantic Ocean by combining the Goddard Space Flight Center GEM-8 earth gravity model with the available 15 x 15 arcmin and 1 x 1 deg mean free air surface gravity observations. The short wavelength undulations were computed by applying Stokes' formula to the 15 x 15 arcmin and 1 x 1 deg surface data. The long wavelength undulations were provided by the GEM-8 model. The gravimetric geoid has been compared with Geoceiver derived and astrogeodetically determined geoid heights in the United States and the rms agreement is on the order of 1.5 meters. Excellent agreement in shape has been found between the detailed geoid and geoidal profiles derived from GEOS-III altimeter data in the Northwest Atlantic Ocean.

  8. Thirty Meter Telescope Detailed Science Case: 2015

    CERN Document Server

    Skidmore, Warren; Fukugawa, Misato; Goswami, Aruna; Hao, Lei; Jewitt, David; Laughlin, Greg; Steidel, Charles; Hickson, Paul; Simard, Luc; Schöck, Matthias; Treu, Tommaso; Cohen, Judith; Anupama, G C; Dickinson, Mark; Harrison, Fiona; Kodama, Tadayuki; Lu, Jessica R; Macintosh, Bruce; Malkan, Matt; Mao, Shude; Narita, Norio; Sekiguchi, Tomohiko; Subramaniam, Annapurni; Tanaka, Masaomi; Tian, Feng; A'Hearn, Michael; Akiyama, Masayuki; Ali, Babar; Aoki, Wako; Bagchi, Manjari; Barth, Aaron; Bhalerao, Varun; Bradac, Marusa; Bullock, James; Burgasser, Adam J; Chapman, Scott; Chary, Ranga-Ram; Chiba, Masashi; Cooray, Asantha; Crossfield, Ian; Currie, Thayne; Das, Mousumi; Dewangan, G C; de Grijs, Richard; Do, Tuan; Dong, Subo; Evslin, Jarah; Fang, Taotao; Fang, Xuan; Fassnacht, Christopher; Fletcher, Leigh; Gaidos, Eric; Gal, Roy; Ghez, Andrea; Giavalisco, Mauro; Grady, Carol A; Greathouse, Thomas; Gogoi, Rupjyoti; Guhathakurta, Puragra; Ho, Luis; Hasan, Priya; Herczeg, Gregory J; Honda, Mitsuhiko; Imanishi, Masa; Inanmi, Hanae; Iye, Masanori; Kamath, U S; Kane, Stephen; Kashikawa, Nobunari; Kasliwal, Mansi; Kirby, Vishal KasliwalEvan; Konopacky, Quinn M; Lepine, Sebastien; Li, Di; Li, Jianyang; Liu, Junjun; Liu, Michael C; Lopez-Rodriguez, Enrigue; Lotz, Jennifer; Lubin, Philip; Macri, Lucas; Maeda, Keiichi; Marchis, Franck; Marois, Christian; Marscher, Alan; Martin, Crystal; Matsuo, Taro; Max, Claire; McConnachie, Alan; McGough, Stacy; Melis, Carl; Meyer, Leo; Mumma, Michael; Muto, Takayuki; Nagao, Tohru; Najita, Joan R; Navarro, Julio; Pierce, Michael; Prochaska, Jason X; Oguri, Masamune; Ojha, Devendra K; Okamoto, Yoshiko K; Orton, Glenn; Otarola, Angel; Ouchi, Masami; Packham, Chris; Padgett, Deborah L; Pandey, Shashi Bhushan; Pilachowsky, Catherine; Pontoppidan, Klaus M; Primack, Joel; Puthiyaveettil, Shalima; Ramirez-Ruiz, Enrico; Reddy, Naveen; Rich, Michael; Richter, Matthew J; Schombert, James; Sen, Anjan Ananda; Shi, Jianrong; Sheth, Kartik; Srianand, R; Tan, Jonathan C; Tanaka, Masayuki; Tanner, Angelle; Tominaga, Nozomu; Tytler, David; U, Vivian; Wang, Lingzhi; Wang, Xiaofeng; Wang, Yiping; Wilson, Gillian; Wright, Shelley; Wu, Chao; Wu, Xufeng; Xu, Renxin; Yamada, Toru; Yang, Bin; Zhao, Gongbo; Zhao, Hongsheng

    2015-01-01

    The TMT Detailed Science Case describes the transformational science that the Thirty Meter Telescope will enable. Planned to begin science operations in 2024, TMT will open up opportunities for revolutionary discoveries in essentially every field of astronomy, astrophysics and cosmology, seeing much fainter objects much more clearly than existing telescopes. Per this capability, TMT's science agenda fills all of space and time, from nearby comets and asteroids, to exoplanets, to the most distant galaxies, and all the way back to the very first sources of light in the Universe. More than 150 astronomers from within the TMT partnership and beyond offered input in compiling the new 2015 Detailed Science Case. The contributing astronomers represent the entire TMT partnership, including the California Institute of Technology (Caltech), the Indian Institute of Astrophysics (IIA), the National Astronomical Observatories of the Chinese Academy of Sciences (NAOC), the National Astronomical Observatory of Japan (NAOJ),...

  9. Reserving by detailed conditioning on individual claim

    Science.gov (United States)

    Kartikasari, Mujiati Dwi; Effendie, Adhitya Ronnie; Wilandari, Yuciana

    2017-03-01

    The estimation of claim reserves is an important activity in insurance companies to fulfill their liabilities. Recently, reserving method of individual claim have attracted a lot of interest in the actuarial science, which overcome some deficiency of aggregated claim method. This paper explores the Reserving by Detailed Conditioning (RDC) method using all of claim information for reserving with individual claim of liability insurance from an Indonesian general insurance company. Furthermore, we compare it to Chain Ladder and Bornhuetter-Ferguson method.

  10. Metastability for Markov processes with detailed balance.

    Science.gov (United States)

    Larralde, Hernán; Leyvraz, François

    2005-04-29

    We present a definition for metastable states applicable to arbitrary finite state Markov processes satisfying detailed balance. In particular, we identify a crucial condition that distinguishes metastable states from other slow decaying modes and which allows us to show that our definition has several desirable properties similar to those postulated in the restricted ensemble approach. The intuitive physical meaning of this condition is simply that the total equilibrium probability of finding the system in the metastable state is negligible.

  11. Shading-based Surface Detail Recovery under General Unknown Illumination.

    Science.gov (United States)

    Xu, Di; Duan, Qi; Zheng, Jianmin; Zhang, Juyong; Cai, Jianfei; Cham, Tat-Jen

    2017-02-17

    Reconstructing the shape of a 3D object from multi-view images under unknown, general illumination is a fundamental problem in computer vision and high quality reconstruction is usually challenging especially when fine detail is needed and the albedo of the object is non-uniform. This paper introduces vertex overall illumination vectors to model the illumination effect and presents a total variation (TV) based approach for recovering surface details using shading and multi-view stereo (MVS). Behind the approach are the two important observations: (1) the illumination over the surface of an object often appears to be piece wise smooth and (2) the recovery of surface orientation is not sufficient for reconstructing the surface, which was often overlooked previously. Thus we propose to use TV to regularize the overall illumination vectors and use visual hull to constrain partial vertices. The reconstruction is formulated as a constrained TV-minimization problem that simultaneously treats the shape and illumination vectors as unknowns. An augmented Lagrangian method is proposed to quickly solve the TV-minimization problem. As a result, our approach is robust, stable and is able to efficiently recover high quality of surface details even when starting with a coarse model obtained using MVS. These advantages are demonstrated by extensive experiments on the state-of-the-art MVS database, which includes challenging objects with varying albedo.

  12. Structural concepts and details for seismic design

    Energy Technology Data Exchange (ETDEWEB)

    1991-09-01

    This manual discusses building and building component behavior during earthquakes, and provides suggested details for seismic resistance which have shown by experience to provide adequate performance during earthquakes. Special design and construction practices are also described which, although they might be common in some high-seismic regions, may not be common in low and moderate seismic-hazard regions of the United States. Special attention is given to describing the level of detailing appropriate for each seismic region. The UBC seismic criteria for all seismic zones is carefully examined, and many examples of connection details are given. The general scope of discussion is limited to materials and construction types common to Department of Energy (DOE) sites. Although the manual is primarily written for professional engineers engaged in performing seismic-resistant design for DOE facilities, the first two chapters, plus the introductory sections of succeeding chapters, contain descriptions which are also directed toward project engineers who authorize, review, or supervise the design and construction of DOE facilities. 88 refs., 188 figs.

  13. Online Schooling in the United States: A Response to Saultz and Fusarelli

    Science.gov (United States)

    Beck, Dennis; LaFrance, Jason

    2017-01-01

    In this paper, we discuss some concerns and recommendations of Saultz and Fusarelli (2017), offering nuanced and detailed views of online schooling from a different perspective. This includes addressing challenges regarding online learning such as fluctuating enrollments, financial concerns, quality assurance, and accountability. In addition, we…

  14. Mapping student online actions

    DEFF Research Database (Denmark)

    Bruun, Jesper; Jensen, Pia; Udby, Linda

    The Virtual Neutrons for Teaching project (vnt.nmi3.org) has converted traditional text book material into a wiki-style online text book that contains the same text and equations as the traditionally styled text book but has added features due to the online nature. Two of these features...... are hypertext navigability (in-text and navigation bar) and socalled wiki-problems some of which have associated hints and solutions. For these problems, students actively choose whether and when to show problem hints and solutions during problem solving. Students might also navigate the page as part...... their problem solving strategy. In this study, we use web analytics software to track student online behavior by recording what particular objects on particular web-pages students click on and when each click occurs. For each recorded session, we create networks based on student clicks: A directed link between...

  15. Online Law Dictionaries

    DEFF Research Database (Denmark)

    Nielsen, Sandro

    2012-01-01

    Online dictionaries that assist users in writing legal texts in English as a foreign language are important lexicographic tools. They can help law students bridge the factual and linguistic gaps between the two legal universes involved. However, existing online law dictionaries with English...... as the target language primarily focus on terms, but students also need to write the remainder of the texts in factually and linguistically correct English. It is therefore important to have a sound theoretical foundation before embarking on a dictionary project that aims to help law students communicate...... by containing the types of data that can best satisfy the needs of students at the three stages of legal text production: draft writing, revising and editing. The theoretical aspects discussed are supported by examples from the online CISG Dictionary, which is a lexicographic tool developed to help Danish law...

  16. Online health information seeking

    DEFF Research Database (Denmark)

    Synnot, Anneliese J.; Hill, Sophie J.; Garner, Kerryn A.

    2016-01-01

    Background and objective: The Internet is increasingly prominent as a source of health information for people with multiple sclerosis (MS). But there has been little exploration of the needs, experiences and preferences of people with MS for integrating treatment information into decision making......, in the context of searching on the Internet. This was the aim of our study. Design: Sixty participants (51 people with MS; nine family members) took part in a focus group or online forum. They were asked to describe how they find and assess reliable treatment information (particularly online) and how...... this changes over time. Thematic analysis was underpinned by a coding frame. Results: Participants described that there was both too much information online and too little that applied to them. They spoke of wariness and scepticism but also empowerment. The availability of up-to-date and unbiased treatment...

  17. Tutoring Executives Online

    DEFF Research Database (Denmark)

    Bignoux, Stephane; Sund, Kristian J.

    2016-01-01

    Studies of learning and student satisfaction in the context of online university programs have largely neglected programs catering specifically to business executives. Such executives have typically been away from higher education for a number of years, and have collected substantial practical...... experience in the subject matters they are taught. Their expectations in terms of both content and delivery may therefore be different from non-executive students. We explore perceptions of the quality of tutoring in the context of an online executive MBA program through participant interviews. We find...... that in addition to some of the tutor behaviors already discussed in the literature, executive students look specifically for practical industry knowledge and experience in tutors, when judging how effective a tutor is. This has implications for both the recruitment and training of online executive MBA tutors....

  18. Online Correlation Clustering

    CERN Document Server

    Mathieu, Claire; Schudy, Warren

    2010-01-01

    We study the online clustering problem where data items arrive in an online fashion. The algorithm maintains a clustering of data items into similarity classes. Upon arrival of v, the relation between v and previously arrived items is revealed, so that for each u we are told whether v is similar to u. The algorithm can create a new cluster for v and merge existing clusters. When the objective is to minimize disagreements between the clustering and the input, we prove that a natural greedy algorithm is O(n)-competitive, and this is optimal. When the objective is to maximize agreements between the clustering and the input, we prove that the greedy algorithm is .5-competitive; that no online algorithm can be better than .834-competitive; we prove that it is possible to get better than 1/2, by exhibiting a randomized algorithm with competitive ratio .5+c for a small positive fixed constant c.

  19. Online social support networks.

    Science.gov (United States)

    Mehta, Neil; Atreja, Ashish

    2015-04-01

    Peer support groups have a long history and have been shown to improve health outcomes. With the increasing familiarity with online social networks like Facebook and ubiquitous access to the Internet, online social support networks are becoming popular. While studies have shown the benefit of these networks in providing emotional support or meeting informational needs, robust data on improving outcomes such as a decrease in health services utilization or reduction in adverse outcomes is lacking. These networks also pose unique challenges in the areas of patient privacy, funding models, quality of content, and research agendas. Addressing these concerns while creating patient-centred, patient-powered online support networks will help leverage these platforms to complement traditional healthcare delivery models in the current environment of value-based care.

  20. Varieties of online gatekeeping

    DEFF Research Database (Denmark)

    Nielsen, Rasmus Kleis

    of gatekeeping (the operating principle behind how social networking sites like Facebook determine what information to display in users’ news feed). Journalists, often working in legacy news media organizations, still play a key gatekeeping role in terms of defining what information constitutes “news”, and news......News media organizations like newspapers and broadcasters have long functioned as gatekeepers between news and audiences, but with the rise of digital media, the search engines and social networking sites that are central to how most people navigate online increasingly complement news media...... media websites remain amongst the most important gateways to news online. But they are increasingly supplemented by other, second-order online gatekeepers like search engines and social networking sites that, while rarely producing original content defined as “news”, increasingly serve as alternative...

  1. Online Law Dictionaries

    DEFF Research Database (Denmark)

    Nielsen, Sandro

    2012-01-01

    Online dictionaries that assist users in writing legal texts in English as a foreign language are important lexicographic tools. They can help law students bridge the factual and linguistic gaps between the two legal universes involved. However, existing online law dictionaries with English...... as the target language primarily focus on terms, but students also need to write the remainder of the texts in factually and linguistically correct English. It is therefore important to have a sound theoretical foundation before embarking on a dictionary project that aims to help law students communicate...... by containing the types of data that can best satisfy the needs of students at the three stages of legal text production: draft writing, revising and editing. The theoretical aspects discussed are supported by examples from the online CISG Dictionary, which is a lexicographic tool developed to help Danish law...

  2. User Types in Online Applications

    Directory of Open Access Journals (Sweden)

    Ion IVAN

    2011-08-01

    Full Text Available Online applications are presented in the context of information society. Online applications characteristics are analyzed. Quality characteristics are presented in relation to online applications users. Types of users for AVIO application are presented. Use cases for AVIO application are identified. The limitations of AVIO application are defined. Types of users in online applications are identified. The threedimensional matrix of access to the online application resources is built. The user type-oriented database is structured. Access management of the fields related to the database tables is analyzed. The classification of online applications users is done.

  3. VizieR Online Data Catalog: Young stellar structures in NGC 6503 (Gouliermis+, 2015)

    Science.gov (United States)

    Gouliermis, D. A.; Thilker, D.; Elmegreen, B. G.; Elmegreen, D. M.; Calzetti, D.; Lee, J. C.; Adamo, A.; Aloisi, A.; Cignoni, M.; Cook, D. O.; Dale, D. A.; Gallagher, J. S. Iii; Grasha, K.; Grebel, E. K.; Davo, A. H.; Hunter, D. A.; Johnson, K. E.; Kim, H.; Nair, P.; Nota, A.; Pellerin, A.; Ryon, J.; Sabbi, E.; Sacchi, E.; Smith, L. J.; Tosi, M.; Ubeda, L.; Whitmore, B.

    2016-03-01

    LEGUS is an HST panchromatic stellar survey of 50 nearby star-forming dwarf and spiral galaxies with an emphasis on UV-enabled science applications. Images in a wide waveband coverage from the near-UV (NUV) to the I band are being collected with WFC3 and ACS in parallel, and combined with archival optical ACS data. The survey, its scientific objectives and the data reduction are described in Calzetti et al. (2015AJ....149...51C). We present a detailed clustering analysis of the young blue stellar population identified with LEGUS across the star-forming ring galaxy NGC 6503. We construct stellar surface density maps and apply a contour-based analysis technique to identify the stellar complexes' population of the galaxy. We identify 244 distinct structures at various stellar density (significance) levels. The complete catalogue of 244 structures is available online at LEGUS site https://legus.stsci.edu/. (1 data file).

  4. A layered modulation method for pixel matching in online phase measuring profilometry

    Science.gov (United States)

    Li, Hongru; Feng, Guoying; Bourgade, Thomas; Yang, Peng; Zhou, Shouhuan; Asundi, Anand

    2016-10-01

    An online phase measuring profilometry with new layered modulation method for pixel matching is presented. In this method and in contrast with previous modulation matching methods, the captured images are enhanced by Retinex theory for better modulation distribution, and all different layer modulation masks are fully used to determine the displacement of a rectilinear moving object. High, medium and low modulation masks are obtained by performing binary segmentation with iterative Otsu method. The final shifting pixels are calculated based on centroid concept, and after that the aligned fringe patterns can be extracted from each frame. After performing Stoilov algorithm and a series of subsequent operations, the object profile on a translation stage is reconstructed. All procedures are carried out automatically, without setting specific parameters in advance. Numerical simulations are detailed and experimental results verify the validity and feasibility of the proposed approach.

  5. Medical imaging technology

    CERN Document Server

    Haidekker, Mark A

    2013-01-01

    Biomedical imaging is a relatively young discipline that started with Conrad Wilhelm Roentgen’s discovery of the x-ray in 1885. X-ray imaging was rapidly adopted in hospitals around the world. However, it was the advent of computerized data and image processing that made revolutionary new imaging modalities possible. Today, cross-sections and three-dimensional reconstructions of the organs inside the human body is possible with unprecedented speed, detail and quality. This book provides an introduction into the principles of image formation of key medical imaging modalities: X-ray projection imaging, x-ray computed tomography, magnetic resonance imaging, ultrasound imaging, and radionuclide imaging. Recent developments in optical imaging are also covered. For each imaging modality, the introduction into the physical principles and sources of contrast is provided, followed by the methods of image formation, engineering aspects of the imaging devices, and a discussion of strengths and limitations of the modal...

  6. NASA's online machine aided indexing system

    Science.gov (United States)

    Silvester, June P.; Genuardi, Michael T.; Klingbiel, Paul H.

    1993-01-01

    This report describes the NASA Lexical Dictionary, a machine aided indexing system used online at the National Aeronautics and Space Administration's Center for Aerospace Information (CASI). This system is comprised of a text processor that is based on the computational, non-syntactic analysis of input text, and an extensive 'knowledge base' that serves to recognize and translate text-extracted concepts. The structure and function of the various NLD system components are described in detail. Methods used for the development of the knowledge base are discussed. Particular attention is given to a statistically-based text analysis program that provides the knowledge base developer with a list of concept-specific phrases extracted from large textual corpora. Production and quality benefits resulting from the integration of machine aided indexing at CASI are discussed along with a number of secondary applications of NLD-derived systems including on-line spell checking and machine aided lexicography.

  7. Refugee and Forced Migration Studies Online

    DEFF Research Database (Denmark)

    Andersson, Vibeke

    the research, instruction, whether tradition, hybrid or online, and policy practice in the field of refugee and forced migration studies. The Roundtable will feature the principal collaborators of the ORTT & PF who will outline how they have utilize this new open source website in their research and courses...... developments in communications technologies and the Internet and the proliferation of websites such as the CARFMS – Online Research and Teaching Tool and Practitioners Forum (ORTT & PF) and the Refugee Research Network (RRN), as examples, have contributed to the accessibility of information, knowledge...... and the convergence of expertise amongst practitioners has transformed the nature of both research, teaching and policy-making in the field of refugee and forced migration studies. The amassing of concentrations of detailed information sources on the Internet or “the cloud” has created new modes and methods...

  8. Towards a detailed soot model for internal combustion engines

    Energy Technology Data Exchange (ETDEWEB)

    Mosbach, Sebastian; Celnik, Matthew S.; Raj, Abhijeet; Kraft, Markus [Department of Chemical Engineering and Biotechnology, University of Cambridge, Pembroke Street, Cambridge CB2 3RA (United Kingdom); Zhang, Hongzhi R. [Department of Chemical Engineering, University of Utah, 1495 East 100 South, Kennecott Research Building, Salt Lake City, UT 84112 (United States); Kubo, Shuichi [Frontier Research Center, Toyota Central R and D Labs., Inc., Nagakute, Aichi 480-1192 (Japan); Kim, Kyoung-Oh [Higashifuji Technical Center, Toyota Motor Corporation, Mishuku 1200, Susono, Shizuoka 480-1193 (Japan)

    2009-06-15

    In this work, we present a detailed model for the formation of soot in internal combustion engines describing not only bulk quantities such as soot mass, number density, volume fraction, and surface area but also the morphology and chemical composition of soot aggregates. The new model is based on the Stochastic Reactor Model (SRM) engine code, which uses detailed chemistry and takes into account convective heat transfer and turbulent mixing, and the soot formation is accounted for by SWEEP, a population balance solver based on a Monte Carlo method. In order to couple the gas-phase to the particulate phase, a detailed chemical kinetic mechanism describing the combustion of Primary Reference Fuels (PRFs) is extended to include small Polycyclic Aromatic Hydrocarbons (PAHs) such as pyrene, which function as soot precursor species for particle inception in the soot model. Apart from providing averaged quantities as functions of crank angle like soot mass, volume fraction, aggregate diameter, and the number of primary particles per aggregate for example, the integrated model also gives detailed information such as aggregate and primary particle size distribution functions. In addition, specifics about aggregate structure and composition, including C/H ratio and PAH ring count distributions, and images similar to those produced with Transmission Electron Microscopes (TEMs), can be obtained. The new model is applied to simulate an n-heptane fuelled Homogeneous Charge Compression Ignition (HCCI) engine which is operated at an equivalence ratio of 1.93. In-cylinder pressure and heat release predictions show satisfactory agreement with measurements. Furthermore, simulated aggregate size distributions as well as their time evolution are found to qualitatively agree with those obtained experimentally through snatch sampling. It is also observed both in the experiment as well as in the simulation that aggregates in the trapped residual gases play a vital role in the soot

  9. Tutoring Executives Online

    DEFF Research Database (Denmark)

    Bignoux, Stephane; Sund, Kristian J.

    2016-01-01

    Studies of learning and student satisfaction in the context of online university programs have largely neglected programs catering specifically to business executives. Such executives have typically been away from higher education for a number of years, and have collected substantial practical...... that in addition to some of the tutor behaviors already discussed in the literature, executive students look specifically for practical industry knowledge and experience in tutors, when judging how effective a tutor is. This has implications for both the recruitment and training of online executive MBA tutors....

  10. Cooperative Online Education

    Directory of Open Access Journals (Sweden)

    Morten Flate Paulsen

    2008-07-01

    Full Text Available Cooperative learning seeks to develop virtual learning environments that allow students to have optimal individual freedom within online learning communities. The pedagogical and administrative challenges with regard to accommodating both individual freedom and cooperation are explained in the Theory of Cooperative Freedom. This article shows that cooperative learning can be implemented successfully through a set of instruments or means. To illustrate this with current examples, the article presents NKI Distance Education’s surveys and experiences with cooperative learning. The article also discusses how issues such as web 2.0, transparency, learning partners and individual progression plans relate to cooperative online education.

  11. Alt. Publicidad Online

    OpenAIRE

    Gómez Benavent, Elena

    2014-01-01

    Treball Final de Grau en Publicitat i Relacions Públiques. Codi: PU0932. Curs: 2013-2014 Alt Publicidad Online es un proyecto de gestión de redes sociales para pequeñas y medianas empresas que apuestan por el mundo online como herramienta esencial para sus negocios. El objetivo principal del trabajo de fin de grado es mostrar la capacidad de las PYMES de hacerse grandes y crecer frente a sus competidores gracias a la calidad y la innovación. Las redes sociales se inician ...

  12. Image registration

    CERN Document Server

    Goshtasby, A Ardeshir

    2012-01-01

    This book presents a thorough and detailed guide to image registration, outlining the principles and reviewing state-of-the-art tools and methods. The book begins by identifying the components of a general image registration system, and then describes the design of each component using various image analysis tools. The text reviews a vast array of tools and methods, not only describing the principles behind each tool and method, but also measuring and comparing their performances using synthetic and real data. Features: discusses similarity/dissimilarity measures, point detectors, feature extr

  13. Detailed modeling of mountain wave PSCs

    Directory of Open Access Journals (Sweden)

    S. Fueglistaler

    2003-01-01

    Full Text Available Polar stratospheric clouds (PSCs play a key role in polar ozone depletion. In the Arctic, PSCs can occur on the mesoscale due to orographically induced gravity waves. Here we present a detailed study of a mountain wave PSC event on 25-27 January 2000 over Scandinavia. The mountain wave PSCs were intensively observed by in-situ and remote-sensing techniques during the second phase of the SOLVE/THESEO-2000 Arctic campaign. We use these excellent data of PSC observations on 3 successive days to analyze the PSCs and to perform a detailed comparison with modeled clouds. We simulated the 3-dimensional PSC structure on all 3 days with a mesoscale numerical weather prediction (NWP model and a microphysical box model (using best available nucleation rates for ice and nitric acid trihydrate particles. We show that the combined mesoscale/microphysical model is capable of reproducing the PSC measurements within the uncertainty of data interpretation with respect to spatial dimensions, temporal development and microphysical properties, without manipulating temperatures or using other tuning parameters. In contrast, microphysical modeling based upon coarser scale global NWP data, e.g. current ECMWF analysis data, cannot reproduce observations, in particular the occurrence of ice and nitric acid trihydrate clouds. Combined mesoscale/microphysical modeling may be used for detailed a posteriori PSC analysis and for future Arctic campaign flight and mission planning. The fact that remote sensing alone cannot further constrain model results due to uncertainities in the interpretation of measurements, underlines the need for synchronous in-situ PSC observations in campaigns.

  14. Students’ online purchasing behavior in Malaysia: Understanding online shopping attitude

    OpenAIRE

    Marzieh Zendehdel; Laily Hj Paim; Syuhaily Bint Osman

    2015-01-01

    Studies examining the factors that affect the online purchasing behavior of consumers are rare, despite the prospective advance of e-commerce in Malaysia. The present study examines particular factors that influence the attitude of potential consumers to purchase online by using the attributes from the diffusion of innovations theory of Rogers, the attribute of perception of risk, and the subjective norms toward online purchasing. Consumers’ perceived risks of online shopping have become a vi...

  15. Detailed measurement on a HESCO diffuser

    DEFF Research Database (Denmark)

    Jensen, Rasmus Lund; Holm, Dorte; Nielsen, Peter V.

    2007-01-01

    the inlet velocity is a very important boundary condition both in CFD calculation and general flow measurements. If only the volume flow and the geometrical area are used, a relatively large error in the inlet velocity may result. From the detailed measurements it was possible to establish an expression......This paper focuses on measuring the inlet velocity from a HESCO diffuser used in the IEA Annex 20 work as a function of the volume flow it provides. The aim of the present work is to establish a relation between the inlet velocity, the effective area and the airflow. This is important because...

  16. Academic detailing to teach aging and geriatrics.

    Science.gov (United States)

    Duckett, Ashley; Cuoco, Theresa; Pride, Pamela; Wiley, Kathy; Iverson, Patty J; Marsden, Justin; Moran, William; Caton, Cathryn

    2015-01-01

    Geriatric education is a required component of internal medicine training. Work hour rules and hectic schedules have challenged residency training programs to develop and utilize innovative teaching methods. In this study, the authors examined the use of academic detailing as a teaching intervention in their residents' clinic and on the general medicine inpatient wards to improve clinical knowledge and skills in geriatric care. The authors found that this teaching method enables efficient, directed education without disrupting patient care. We were able to show improvements in medical knowledge as well as self-efficacy across multiple geriatric topics.

  17. A detailed phylogeny for the Methanomicrobiales

    Science.gov (United States)

    Rouviere, P.; Mandelco, L.; Winker, S.; Woese, C. R.

    1992-01-01

    The small subunit rRNA sequence of twenty archaea, members of the Methanomicrobiales, permits a detailed phylogenetic tree to be inferred for the group. The tree confirms earlier studies, based on far fewer sequences, in showing the group to be divided into two major clusters, temporarily designated the "methanosarcina" group and the "methanogenium" group. The tree also defines phylogenetic relationships within these two groups, which in some cases do not agree with the phylogenetic relationships implied by current taxonomic names--a problem most acute for the genus Methanogenium and its relatives. The present phylogenetic characterization provides the basis for a consistent taxonomic restructuring of this major methanogenic taxon.

  18. A detailed phylogeny for the Methanomicrobiales

    Science.gov (United States)

    Rouviere, P.; Mandelco, L.; Winker, S.; Woese, C. R.

    1992-01-01

    The small subunit rRNA sequence of twenty archaea, members of the Methanomicrobiales, permits a detailed phylogenetic tree to be inferred for the group. The tree confirms earlier studies, based on far fewer sequences, in showing the group to be divided into two major clusters, temporarily designated the "methanosarcina" group and the "methanogenium" group. The tree also defines phylogenetic relationships within these two groups, which in some cases do not agree with the phylogenetic relationships implied by current taxonomic names--a problem most acute for the genus Methanogenium and its relatives. The present phylogenetic characterization provides the basis for a consistent taxonomic restructuring of this major methanogenic taxon.

  19. ID-Check: Online Concealed Information Test Reveals True Identity.

    Science.gov (United States)

    Verschuere, Bruno; Kleinberg, Bennett

    2016-01-01

    The Internet has already changed people's lives considerably and is likely to drastically change forensic research. We developed a web-based test to reveal concealed autobiographical information. Initial studies identified a number of conditions that affect diagnostic efficiency. By combining these moderators, this study investigated the full potential of the online ID-check. Participants (n = 101) tried to hide their identity and claimed a false identity in a reaction time-based Concealed Information Test. Half of the participants were presented with personal details (e.g., first name, last name, birthday), whereas the others only saw irrelevant details. Results showed that participants' true identity could be detected with high accuracy (AUC = 0.98; overall accuracy: 86-94%). Online memory detection can reliably and validly detect whether someone is hiding their true identity. This suggests that online memory detection might become a valuable tool for forensic applications.

  20. A detailed study of the enigmatic cluster M82F

    CERN Document Server

    Bastian, N; Smith, L J; Trancho, G; Westmoquette, M S; Gallagher, J S

    2007-01-01

    We present a detailed study of the stellar cluster M82F, using multi-band high resolution HST imaging and deep ground based optical slit and integral field spectroscopy. Using the imaging we create colour maps of the cluster and surrounding region in order to search for substructure. We find a large amount of substructure, which we interpret as the result of differential extinction across the projected face of the cluster. With this interpretation, we are able to construct a spatially resolved extinction map across the cluster which is used to derive the intrinsic flux distribution. Fitting cluster profiles (King and EFF) to the intrinsic images we find that the cluster is 15-30% larger than previous estimates, and that no strong evidence of mass segregation in this cluster exists. Using the optical spectra, we find that the age of M82F is 60-80 Myr and from its velocity conclude that the cluster is not physically associated with a large HII region that it is projected upon, both in agreement with previous st...

  1. Library Services Online: Introducing Library Services for Online MBA Classes

    Science.gov (United States)

    Slavin, Laura C.

    2015-01-01

    In this article, a librarian at Lincoln Memorial University creates library services for an MBA program offered entirely online that is in the early stages of development. The library services include a subject guide and 4 tutorials that will be added to the MBA online orientation. Other services include offering online office hours and…

  2. Online Support Service Quality, Online Learning Acceptance, and Student Satisfaction

    Science.gov (United States)

    Lee, Jung-Wan

    2010-01-01

    This paper examines potential differences between Korean and American students in terms of their perception levels regarding online education support service quality, online learning acceptance, and satisfaction. Eight hundred and seventy-two samples, which were collected from students in online classes in the United States and Korea, were…

  3. Introducing Online Bibliographic Service to its Users: The Online Presentation

    Science.gov (United States)

    Crane, Nancy B.; Pilachowski, David M.

    1978-01-01

    A description of techniques for introducing online services to new user groups includes discussion of terms and their definitions, evolution of online searching, advantages and disadvantages of online searching, production of the data bases, search strategies, Boolean logic, costs and charges, "do's and don'ts," and a user search questionnaire. (J…

  4. Online Support Service Quality, Online Learning Acceptance, and Student Satisfaction

    Science.gov (United States)

    Lee, Jung-Wan

    2010-01-01

    This paper examines potential differences between Korean and American students in terms of their perception levels regarding online education support service quality, online learning acceptance, and satisfaction. Eight hundred and seventy-two samples, which were collected from students in online classes in the United States and Korea, were…

  5. Collective Information Literacy in Massively Multiplayer Online Games

    Science.gov (United States)

    Martin, Crystle; Steinkuehler, Constance

    2010-01-01

    This article explores the forms of information literacy that arise in commercial entertainment games like "World of Warcraft." Using examples culled from eight months of online ethnographic data, the authors detail the forms of information literacy that arise as a regular part of in-game social interaction, emphasizing (ironically) the…

  6. Suggested Guidelines for Screen Layouts and Design of Online Catalogs.

    Science.gov (United States)

    Matthews, Joseph R.

    1987-01-01

    Presents detailed guidelines based on the literature for screen layout and design of online catalogs, and discusses the potential advantages in terms of number of transactions per hour and user satisfaction. Further research questions are suggested and an extensive bibliography is provided. (CLB)

  7. LHC@home online tutorial for Windows users - recording

    CERN Document Server

    CERN. Geneva

    2016-01-01

    A step-by-step online tutorial about LHC@home for Windows users by Karolina Bozek. It contains detailed instructions on how-to-join this volunteer computing project.  This 5' video is linked from http://lhcathome.web.cern.ch/join-us Also from the CDS e-learning category.

  8. LHC@home online tutorial for Linux users - recording

    CERN Document Server

    CERN. Geneva

    2016-01-01

    A step-by-step online tutorial for LHC@home by Karolina Bozek It contains detailed instructions for Linux users on how-to-join this volunteer computing project.  This 5' linked from http://lhcathome.web.cern.ch/join-us CLICK Here to see the commands to copy/paste for installing BOINC and the VirtualBox.

  9. Online Language Learning Histories Exchange: Hong Kong and German Perspectives

    Science.gov (United States)

    Chik, Alice; Breidbach, Stephan

    2011-01-01

    Advocating dialogue between language teachers and learners has been an area of growing exploration, particularly in the area of reflective practice in second language teacher education. In this brief report, the authors detail the conceptualization and procedures of two online exchange projects conducted in 2008 and 2009, in which they tried to…

  10. VLBA Movies Reveal New Details of Cosmic Jets

    Science.gov (United States)

    2008-01-01

    Astronomers have known for decades that supermassive black holes at the cores of galaxies can shoot out jets of subatomic particles at tremendous speeds. However, details about the physics of such jets, including how they are generated, how the high-speed flows are shaped into jets, and how fast the particles are moving, among many others, have remained elusive. An international team of researchers now is making an unprecedented long-term study of the motions of these giant jets, using the super-sharp imaging capabilities of the National Science Foundation's Very Long Baseline Array (VLBA). "We're making images of 200 galactic jets at regular intervals, tracking their motions and studying their magnetic-field properties. This is making major contributions to our understanding of such jets," said Matthew Lister, of Purdue University. MOJAVE Poster Click image for high-resolution file (11.9 MB) The research team has produced time-lapse movies of 100 of the jets, allowing measurement of the speed and direction of motion. "The results of these VLBA observations are going into a rich and still-growing set of data that is available to the entire astronomical research community as a tool for understanding the many unresolved questions we have about these jets," Lister said. The jet study is called MOJAVE -- Monitoring Of Jets in Active galactic nuclei with VLBA Experiments -- and began in 2002. It is a successor to an earlier VLBA study that regularly made images of nearly 200 jets from 1994 to 2002. The jets are powered by the gravitational energy of black holes containing hundreds of millions times more mass than the Sun. Black holes are concentrations of mass so dense that not even light can escape them. As these monsters draw material toward them, the material falls into a circular disk orbiting the black hole. The jets are propelled outward along the poles of the disk. The MOJAVE movies have given astronomers some surprises and also have spurred follow-on studies of

  11. Forming 'Forbidden' Identities Online: Atheism in Indonesia

    Directory of Open Access Journals (Sweden)

    Saskia Schäfer

    2016-12-01

    Full Text Available This article discusses the online activism of Indonesian atheists. While most of the little existent scholarship on atheism in Indonesia views the controversial cases in the light of the violation of Western-style rights to free speech and religious liberty, a closer look at the public discourses both online and offline reveals a more complex picture. The article embeds atheist activism and the well-known case of Alexander An in the changing landscape of religion and state in post-Suharto Indonesia. It points at the intricate relationship between atheism and blasphemy and shows how activists not only carve a space for themselves online, but also seek to counter the negative and anti-religious image that decades-long campaigning has created for atheists. Activists use Facebook, Twitter, messaging systems, and forums such as Quora, both to become visible and yet allow for anonymity. Their online communication and activism is often coupled with offline meetings. In this way, atheists allow for a thriving ‘community’, and also present atheism positively in public. However, to defend atheism this way also has its downsides, as it aligns Indonesian atheists with an international network of mainly Western-funded human rights activists and thus runs the risk of further alienating them from a nation that strongly defines itself along religious identity.

  12. Aesthetic quality inference for online fashion shopping

    Science.gov (United States)

    Chen, Ming; Allebach, Jan

    2014-03-01

    On-line fashion communities in which participants post photos of personal fashion items for viewing and possible purchase by others are becoming increasingly popular. Generally, these photos are taken by individuals who have no training in photography with low-cost mobile phone cameras. It is desired that photos of the products have high aesthetic quality to improve the users' online shopping experience. In this work, we design features for aesthetic quality inference in the context of online fashion shopping. Psychophysical experiments are conducted to construct a database of the photos' aesthetic evaluation, specifically for photos from an online fashion shopping website. We then extract both generic low-level features and high-level image attributes to represent the aesthetic quality. Using a support vector machine framework, we train a predictor of the aesthetic quality rating based on the feature vector. Experimental results validate the efficacy of our approach. Metadata such as the product type are also used to further improve the result.

  13. The emergence of online learning in PN Education.

    Science.gov (United States)

    Hopkins, David D

    2008-01-01

    For the fifth year in a row the online learning sector outpaced growth rates of the traditional classroom. Online learning continues to garner increasing levels of positive support from administrators, employers, and students who value the option of online education at increasingly greater levels. PN Education has largely remained on the sidelines of this revolution. However, with the nursing crisis growing, students, governments, and institutions demanding more access and convenience to educational options, and the emergence of the Millennial Generation making up the majority of the students, the time has come for PN programs to embrace the potential of online learning. With its diverse mix of didactic, clinical, and lab requirements, PN education is ideally suited for the newest evolution of online delivery-Blended Learning 2.0. This paper will analyze in detail the overall state of affairs of online learning, especially as it pertains to educating the next generation of practical nurses, and finally to provide an overview of the key components of a quality online program in PN Education.

  14. A Detailed Chemical Kinetic Model for TNT

    Energy Technology Data Exchange (ETDEWEB)

    Pitz, W J; Westbrook, C K

    2005-01-13

    A detailed chemical kinetic mechanism for 2,4,6-tri-nitrotoluene (TNT) has been developed to explore problems of explosive performance and soot formation during the destruction of munitions. The TNT mechanism treats only gas-phase reactions. Reactions for the decomposition of TNT and for the consumption of intermediate products formed from TNT are assembled based on information from the literature and on current understanding of aromatic chemistry. Thermodynamic properties of intermediate and radical species are estimated by group additivity. Reaction paths are developed based on similar paths for aromatic hydrocarbons. Reaction-rate constant expressions are estimated from the literature and from analogous reactions where the rate constants are available. The detailed reaction mechanism for TNT is added to existing reaction mechanisms for RDX and for hydrocarbons. Computed results show the effect of oxygen concentration on the amount of soot precursors that are formed in the combustion of RDX and TNT mixtures in N{sub 2}/O{sub 2} mixtures.

  15. Bolivia-Brazil gas line route detailed

    Energy Technology Data Exchange (ETDEWEB)

    1992-05-11

    This paper reports that state oil companies of Brazil and Bolivia have signed an agreement outlining the route for a 2,270 km pipeline system to deliver natural gas from Bolivian fields to Southeast Brazil. The two sides currently are negotiating details about construction costs as well as contract volumes and prices. Capacity is projected at 283-565 MMcfd. No official details are available, but Roberto Y. Hukai, a director of the Sao Paulo engineering company Jaako Poyry/Technoplan, estimates transportation cost of the Bolivian gas at 90 cents/MMBTU. That would be competitive with the price of gas delivered to the Sao Paulo gas utility Comgas, he the. Brazil's Petroleos Brasileiro SA estimates construction of the pipeline on the Brazilian side alone with cost $1.2-1.4 billion. Bolivia's Yacimientos Petroliferos Fiscales Bolivianos (YPFB) is negotiating with private domestic and foreign investors for construction of the Bolivian portion of the project.

  16. Motivation of Online Buyer Behavior

    National Research Council Canada - National Science Library

    Veronika Svatosová

    2013-01-01

    .... The subject matter of this article is an analysis of the features of online buyer behavior compared to the general regularities of buyer behavior, definition of the main motives of online shopping...

  17. Should Online Businesses Be Taxed?

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    From July 1,people running businesses or offering services online in China are required to register their identities with trading platform operators. The real-name registration system for online businesses under

  18. Aggregated Computational Toxicology Online Resource

    Data.gov (United States)

    U.S. Environmental Protection Agency — Aggregated Computational Toxicology Online Resource (AcTOR) is EPA's online aggregator of all the public sources of chemical toxicity data. ACToR aggregates data...

  19. Simultaneous structure and geometry detail completion based on interactive user sketches

    Institute of Scientific and Technical Information of China (English)

    YANG Shen; QI Yue; QIN Hong

    2012-01-01

    We articulate a novel approach to geometric model completion via interactive sketches in this paper.First,the initial incomplete model (with holes) is decomposed into a base model and a high-frequency component,which represents global rough shape and geometric details,respectively.We then repair the base model via smooth hole-filling,and compute the geometry detail image using high frequency information.One novel element of our approach is that we allow users to interactively sketch a few structural curves that span across hole regions,with a goal to repair both local geometric details and global structure.With the help of local parameterization,we convert detailed geometry into gradient-domain images which can propagate along user-specified sketches.By integrating recovered gradient-domain images and base shape,we can generate a complete model that faithfully recovers both global structure and local details.The salient contribution of this paper is the unified approach for user interaction,global structure,and geometry details towards high-fidelity model completion.We demonstrate our new approach using a number of examples that exhibit salient global structure as well as local geometry details.

  20. Online Proactive Reviews

    DEFF Research Database (Denmark)

    Kolbæk, Ditte

    The aim of this study is to explore online, collaborative learning when it takes place in the context of work. The study is based on an educational design of collaborative learning called Proactive Reviews (PR). A PR is the point of departure for an organisational learning process involving...

  1. Stanford's Online Strategy

    Science.gov (United States)

    Waters, John K.

    2013-01-01

    Stanford University (CA) is MOOC Central. While the school may not have launched the first massive open online course (MOOC), its efforts have propelled the concept to the forefront of higher education in a matter of months. Starting with Sebastian Thrun's Introduction to Artificial Intelligence course, which enrolled 160,000 students, Stanford…

  2. Managing your online reputation.

    Science.gov (United States)

    Segal, Jeffrey

    2012-01-01

    Doctor review sites now populate the Internet. Such posts are often anonymous. Doctors cannot respond because of HIPAA. And the information rarely addresses matters such as patient safety and clinical outcomes. Nonetheless, a doctor's online reputation can positively or negatively impact a doctor's business. By following a number of rules, a doctor can proactively manage his or her reputation.

  3. Practical Online Retrieval Evaluation

    NARCIS (Netherlands)

    Radlinski, F.; Hofmann, K.

    2013-01-01

    Online evaluation allows the assessment of information retrieval (IR) techniques based on how real users respond to them. Because this technique is directly based on observed user behavior, it is a promising alternative to traditional offline evaluation, which is based on manual relevance assessment

  4. Online Civic Cultures?

    DEFF Research Database (Denmark)

    Uldam, Julie; Askanius, Tina

    2013-01-01

    This article explores the potential of video activism on YouTube to form a communicative space for deliberation and dissent. It asks how commenting on activist videos can help sustain civic cultures that allow for both antagonism and inclusive political debate. Drawing on a case study of online...

  5. Foraging Online Social Networks

    NARCIS (Netherlands)

    Koot, G.; Huis in ’t Veld, M.A.A.; Hendricksen, J.; Vries, A. de; Broek, E.L. van den

    2014-01-01

    A concise and practical introduction is given on Online Social Networks (OSN) and their application in law enforcement, including a brief survey of related work. Subsequently, a tool is introduced that can be used to search OSN in order to generate user profiles. Both its architecture and processing

  6. African Journals Online: Religion

    African Journals Online (AJOL)

    Items 1 - 6 of 6 ... AFRICAN JOURNALS ONLINE (AJOL) · Journals · Advanced Search · USING AJOL · RESOURCES ... View Journal | Current Issue | Register This Journal is Open Access ... Ilorin Journal of Religious Studies is a peer-reviewed academic ... of Religion in Southern Africa as a forum for scholarly contributions of ...

  7. African Journals Online: Philosophy

    African Journals Online (AJOL)

    Items 1 - 7 of 7 ... AFRICAN JOURNALS ONLINE (AJOL) · Journals · Advanced Search · USING AJOL · RESOURCES ... Ilorin Journal of Religious Studies is a peer-reviewed academic ... View Journal | Current Issue | Register This Journal is Open Access ... and to broaden contributions to include writers from other African, ...

  8. Online Literacies at Work.

    Science.gov (United States)

    Searle, Jean

    1999-01-01

    Uses examples drawn from research across several sites in tourism and hospitality in which employees are required to interact with technology, in order to highlight issues relating to new online literacies that are now required for efficient work practices and to discuss implications for practice. (Adjunct ERIC Clearinghouse for ESL Literacy…

  9. African Journals Online: Health

    African Journals Online (AJOL)

    Items 1 - 50 of 167 ... Papers relating to impact, care, prevention and social planning, as well as ... all fields within the Biomedical Sciences including the allied health fields. ... is to serve as a conduit for academic and professional media, covering all research ... The African Journal of Health Professions Education is an online, ...

  10. Online archives of Science

    CERN Multimedia

    GS Department

    2009-01-01

    CERN Library has enabled till 26th June 2009 a trial access to the online archives of Science, starting in 1880. You are welcome to test this resource at http://www.sciencemag.org/archive/ Please contact mailto:Anne.Gentil-Beccot@cern.ch, for any feedback to share.

  11. Oh No! It's Online!

    Science.gov (United States)

    Hoskins, Barbara J.

    2012-01-01

    During the last issue of this journal (Volume 60, Number 2), readers were introduced to Dr. Kelly McGyver. Her department head asked her to teach the 820 course when a colleague faced unexpected medical issues. The department head also requested her to redesign the biennial graduate-level course as an online course two months before the beginning…

  12. MIS On-Line.

    Science.gov (United States)

    Thomson, Nancy S.; Echeverria, Donna Rose; Mills, Bob

    This paper describes the resources, processes and outcomes involved in the development of an introductory Management Information Systems (MIS) course designed to utilize as many of the technologies as possible to redefine the teaching/learning paradigm. The MIS-Online project at Northwest Missouri State University encompasses the available campus…

  13. Online Sourcing - Take Precautions

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    @@ IN the past few years, the development of online B2B platforms has made international trade much easier.Today, buyers from all over the world just need a few clicks of the mouse to find suppliers through these websites.

  14. Foraging Online Social Networks

    NARCIS (Netherlands)

    Koot, G.; Huis in ’t Veld, M.A.A.; Hendricksen, J.; Vries, A. de; Broek, E.L. van den

    2014-01-01

    A concise and practical introduction is given on Online Social Networks (OSN) and their application in law enforcement, including a brief survey of related work. Subsequently, a tool is introduced that can be used to search OSN in order to generate user profiles. Both its architecture and processing

  15. African Journals Online: Education

    African Journals Online (AJOL)

    Items 1 - 35 of 35 ... The African Journal of Chemical Education (AJCE) is a biannual online journal of the ... to the scholarship of teaching and learning in higher education. .... of disease and disability; Community oriented primary care; Education and .... It includes a variety of research genres; conference reviews and keynote ...

  16. Practical Online Retrieval Evaluation

    NARCIS (Netherlands)

    Radlinski, F.; Hofmann, K.

    2013-01-01

    Online evaluation allows the assessment of information retrieval (IR) techniques based on how real users respond to them. Because this technique is directly based on observed user behavior, it is a promising alternative to traditional offline evaluation, which is based on manual relevance

  17. Foraging online social networks

    NARCIS (Netherlands)

    Koot, Gijs; Huis in ’t Veld, Mirjam; Hendricksen, Joost; Kaptein, Rianne; Vries, Arnout; Broek, van den Egon L.; Hengst, den M.; Israël, M.; Zeng, D.; Veenman, C.; Wang, A.

    2014-01-01

    A concise and practical introduction is given on Online Social Networks (OSN) and their application in law enforcement, including a brief survey of related work. Subsequently, a tool is introduced that can be used to search OSN in order to generate user profiles. Both its architecture and processing

  18. Evaluation of Online Searches.

    Science.gov (United States)

    Blood, Richard W.

    Based on an analysis of online search evaluation forms collected from all types of U.S. libraries, and a pilot test of a draft evaluation form in selected federal research libraries, this report presents the work of the American Library Association's (ALA's) Machine-Assisted Reference Section (MARS) Committee on Measurement and Evaluation. The…

  19. African Journals Online (AJOL)

    African Journals Online (AJOL)

    African Journals OnLine (AJOL) is the world's largest and pre-eminent collection of ... this, so that African-origin research output is available to Africans and to the rest of the world. ... International Journal of Biological and Chemical Sciences.

  20. Mastering the Online MBA

    Science.gov (United States)

    Schaffhauser, Dian

    2011-01-01

    Kenan-Flagler Business School at the University of North Carolina at Chapel Hill plans to launch an online-only MBA program this July. The school has forged a unique partnership with 2tor, a for-profit company led by John Katzman, the same person who founded "The Princeton Review." Katzman has become an educational reformer of sorts. With 2tor, he…