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Sample records for acquisition technique tpat

  1. Rapid MR assessment of left ventricular systolic function after acute myocardial infarction using single breath-hold cine imaging with the temporal parallel acquisition technique (TPAT) and 4D guide-point modelling analysis of left ventricular function

    Energy Technology Data Exchange (ETDEWEB)

    Eberle, Holger C.; Jensen, Christoph J.; Sabin, Georg V.; Naber, Christoph K.; Bruder, Oliver [Elisabeth Hospital, Department of Cardiology and Angiology, Essen (Germany); Nassenstein, Kai; Schlosser, Thomas [University of Duisburg-Essen, Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, Essen (Germany)

    2010-01-15

    We compared four-dimensional guide-point modelling left ventricular function analysis (4DVF) results of cine images in four short-axis and two long-axis slices acquired in a single breath-hold, obtained with the temporal parallel acquisition technique (TPAT), with standard left ventricular function (LVF) analysis results determined by the summation of discs method, in patients who had recently suffered myocardial infarction. Despite wall motion abnormalities, 4DVF yields results for left ventricular ejection fractions and end-diastolic and end-systolic volumes that are in excellent agreement with standard LVF analysis results in these patients. A shortened cardiac magnetic resonance (CMR) protocol using single breath-hold cine image acquisition could facilitate the assessment of left ventricular function soon after myocardial infarction in critically ill patients who are unable to comply with the multiple breath-holds required for standard LVF analysis. (orig.)

  2. 78 FR 30934 - Agency Information Collection Activities: Customs-Trade Partnership Against Terrorism (C-TPAT)

    Science.gov (United States)

    2013-05-23

    ... Partnership Against Terrorism (C-TPAT) AGENCY: U.S. Customs and Border Protection (CBP), Department of... requirement concerning the Customs-Trade Partnership Against Terrorism (C-TPAT). This request for comment is...: Customs-Trade Partnership Against Terrorism (C-TPAT). OMB Number: 1651-0077. Form Number: None. Abstract...

  3. 75 FR 6678 - Agency Information Collection Activities: Customs and Trade Partnership Against Terrorism (C-TPAT)

    Science.gov (United States)

    2010-02-10

    ... Partnership Against Terrorism (C-TPAT) AGENCY: U.S. Customs and Border Protection (CBP), Department of... requirement concerning the Customs and Trade Partnership Against Terrorism (C-TPAT). This request for comment...: Title: Customs and Trade Partnership Against Terrorism (C-TPAT). OMB Number: 1651-0077. Form Number...

  4. 78 FR 44961 - Agency Information Collection Activities; Customs-Trade Partnership Against Terrorism (C-TPAT)

    Science.gov (United States)

    2013-07-25

    ... Partnership Against Terrorism (C-TPAT) AGENCY: U.S. Customs and Border Protection, Department of Homeland... Paperwork Reduction Act: Customs-Trade Partnership Against Terrorism (C-TPAT). This is a proposed extension... Against Terrorism (C-TPAT). OMB Number: 1651-0077. Form Number: None. Abstract: The Customs-Trade...

  5. Data acquisition techniques using PC

    CERN Document Server

    Austerlitz, Howard

    1991-01-01

    Data Acquisition Techniques Using Personal Computers contains all the information required by a technical professional (engineer, scientist, technician) to implement a PC-based acquisition system. Including both basic tutorial information as well as some advanced topics, this work is suitable as a reference book for engineers or as a supplemental text for engineering students. It gives the reader enough understanding of the topics to implement a data acquisition system based on commercial products. A reader can alternatively learn how to custom build hardware or write his or her own software.

  6. Variation and Acquisition of Complex Techniques: Pancreaticoduodenectomy.

    Science.gov (United States)

    Davidson, Stuart J; Rojnica, Marko; Matthews, Jeffrey B; Langerman, Alexander J

    2016-12-01

    Background Complex procedures often have numerous acceptable approaches; it is unclear how surgical fellows choose between techniques. We used pancreaticoduodenectomy as a model to catalogue variability between surgeons and investigate factors that affect fellows' acquisition of techniques. Materials and methods Semistructured interviews and operative note analysis were conducted to determine techniques of 5 attending surgeons, and these data were mapped to identify variations. Identical interviews and questioning were completed with 4 fellowship graduates whose practice includes pancreaticoduodenectomy. Results All surgeons performed a different operation, both in order and techniques employed. Based on minor variations, there were 21 surgical step data points that differed. Of 5 surgeons, 4 were unable to identify colleagues' techniques. Fellows reported adopting techniques from mentors who had regimented techniques, teaching styles they related to, and with whom they frequently operated. Residency training did not strongly influence their choice of technique; however, senior partners after fellowship did influence technique. Conclusions The number of variants of pancreaticoduodenectomy based on granular, step-by-step differences is larger than previously described. Results hint that variation may be furthered by the fact that surgeons are not aware of the techniques used by colleagues. Fellows choose techniques based on factors not directly related to their own outcomes but rather mentor factors. Whether fellows adopt techniques that will be optimal given their abilities is worthy of further investigation, as are changes in technique over time. Better codification of variation is needed to facilitate these investigations as well as matching of technical variations to patient outcomes. © The Author(s) 2016.

  7. 78 FR 37690 - Federal Acquisition Regulation; Price Analysis Techniques

    Science.gov (United States)

    2013-06-21

    ... Federal Acquisition Regulation; Price Analysis Techniques AGENCY: Department of Defense (DoD), General... clarify and give a precise reference in the use of a price analysis technique in order to establish a fair... reference used in FAR 15.404-1(b)(2)(i). FAR 15.404-1(b)(2) addresses various price analysis techniques and...

  8. 77 FR 40552 - Federal Acquisition Regulation; Price Analysis Techniques

    Science.gov (United States)

    2012-07-10

    ... Federal Acquisition Regulation; Price Analysis Techniques AGENCY: Department of Defense (DoD), General... clarify the use of a price analysis technique in order to establish a fair and reasonable price. DATES....404-1(b)(2) addresses various price analysis techniques and procedures the Government may use to...

  9. A novel time stamping technique for distributed data acquisition systems.

    Science.gov (United States)

    Subramaniam, E T

    2012-12-01

    In this paper, we discuss the design and implementation of a synchronizing technique for data acquisition systems, which can effectively use the normal, standard local area network cables to provide a time stamp, with a range up to 32 days, resolution of 10 ns, and synchronization within ± 5 ns. This system may be used to synchronize data being collected by independent heterogeneous data acquisition modules, that acquire events independently. Such distributed systems are generally designed with a tree-like structure or independent self-triggered acquisition boxes. These leaf edges are connected through branches to the root node, via non-bus based inter-connecting links. The present system has been tested with a set of self-triggered digital signal processing based data acquisition engines, having a 100 MHz analog to digital converter front end.

  10. Psycholinguistic Techniques and Resources in Second Language Acquisition Research

    Science.gov (United States)

    Roberts, Leah

    2012-01-01

    In this article, a survey of current psycholinguistic techniques relevant to second language acquisition (SLA) research is presented. I summarize many of the available methods and discuss their use with particular reference to two critical questions in current SLA research: (1) What does a learner's current knowledge of the second language (L2)…

  11. Psycholinguistic Techniques and Resources in Second Language Acquisition Research

    Science.gov (United States)

    Roberts, Leah

    2012-01-01

    In this article, a survey of current psycholinguistic techniques relevant to second language acquisition (SLA) research is presented. I summarize many of the available methods and discuss their use with particular reference to two critical questions in current SLA research: (1) What does a learner's current knowledge of the second language (L2)…

  12. In search of the best technique for vocabulary acquisition

    Directory of Open Access Journals (Sweden)

    Mohammad Mohseni-Far

    2008-05-01

    Full Text Available Teade plagiaadi kohta / Report of an Act of Plagiarism (6. mai 2012 / 6 May, 2012ERÜ aastaraamatus 4 (2008 lk 121–138 ilmunud Mohammad Mohseni-Far'i artikli "In Search of the Best Technique for Vocabulary Acquisition" näol on tegemist iseenda plagiaadiga. Sama artikkel on 2008. a ilmunud lisaks ERÜ aastaraamatule veel KAKS KORDA ligilähedases sõnastuses ning ligilähedase pealkirjaga. Kuna autor on tegelnud sõnastuse muutmisega, siis järelikult on tegemist teadliku plagiaadiga. Vt ka Check for Plagiarism On the Web.We are sorry to inform that Mohammad Mohseni-Far, the author of 'In Search of the Best Technique for Vocabulary Acquisition' published in ERÜ aastaraamat / EAAL yearbook, Vol. 4 (2008 pp. 121–138, has published the same article TWICE in another journal just by changing the title and a few wordings. The plagiarism is verified, using the Check for Plagiarism On the Web.A Cognitively-oriented Encapsulation of Strategies Utilized for Lexical Development: In search of a flexible and highly interactive curriculum. – Porta Linguarum 9 (2008, 35–42. Techniques and Strategies Utilized for Vocabulary Acquisition: the necessity to design a multifaceted framework with an instructionally wise equilibrium. – Porta Linguarum 8 (2007, 137–152.ERÜ aastaraamatu toimetus / Editors of the EAAL yearbook***The present study is intended to critically examine vocabulary learning/acquisition techniques within second/foreign language context. Accordingly, the purpose of this survey is to concentrate particularly on the variables connected with lexical knowledge and establish a fairly all-inclusive framework which comprises and expounds on the most significant strategies and relevant factors within the vocabulary acquisition context. At the outset, the study introduces four salient variables; learner, task and strategy serve as a general structure of inquiry (Flavell’s cognitive model, 1992. Besides, the variable of context

  13. Data acquisition and preprocessing techniques for remote sensing field research

    Science.gov (United States)

    Biehl, L. L.; Robinson, B. F.

    1983-01-01

    A crops and soils data base has been developed at Purdue University's Laboratory for Applications of Remote Sensing using spectral and agronomic measurements made by several government and university researchers. The data are being used to (1) quantitatively determine the relationships of spectral and agronomic characteristics of crops and soils, (2) define future sensor systems, and (3) develop advanced data analysis techniques. Researchers follow defined data acquisition and preprocessing techniques to provide fully annotated and calibrated sets of spectral, agronomic, and meteorological data. These procedures enable the researcher to combine his data with that acquired by other researchers for remote sensing research. The key elements or requirements for developing a field research data base of spectral data that can be transported across sites and years are appropriate experiment design, accurate spectral data calibration, defined field procedures, and through experiment documentation.

  14. Signal sampling techniques for data acquisition in process control

    NARCIS (Netherlands)

    Laan, Marten Derk van der

    1995-01-01

    In computing sytems employed for data acquisition and process control, communication with the controlled processes is mainly taking place via analog signal lines. In this situation, the quality of data acquired by A/D-converters and the generation of analog control signals by D/A-converters is of

  15. Faster Acquisition Technique for Software-defined GPS Receivers

    Directory of Open Access Journals (Sweden)

    M. Venu Gopala Rao

    2015-03-01

    Full Text Available Acquisition is a most important process and a challenge task for identifying visible satellites, coarse values of carrier frequency, and code phase of the satellite signals in designing software defined Global positioning system (GPS receiver. This paper presents a new, simple, efficient and faster GPS acquisition via sub-sampled fast Fourier transform (ssFFT. The proposed algorithm exploits the recently developed sparse FFT (or sparse IFFT that computes in sub-linear time. Further it uses the property of fourier transforms (FT: Aliasing a signal in the time domain corresponds to sub-sampling it in the frequency domain, and vice versa. The ssFFT is an FFT algorithm that computes sub-sampled version of the data by an integer factor ‘d’, and hence, the computational complexity is proportionately reduced by a factor of ‘d log d’ compared to conventional FFT-based algorithms for any length of the input GPS signal. The simulation results show that the proposed ssFFT based GPS acquisition computation is 8.5571 times faster than the conventional FFT-based acquisition computation time. The implementation of this method in an FPGA provides very fast processing of incoming GPS samples that satisfies real-time positioning requirements.Defence Science Journal, Vol. 65, No. 1, January 2015, pp.5-11, DOI:http://dx.doi.org/10.14429/dsj.65.5579

  16. Signal sampling techniques for data acquisition in process control

    OpenAIRE

    Laan, Marten Derk van der

    1995-01-01

    In computing sytems employed for data acquisition and process control, communication with the controlled processes is mainly taking place via analog signal lines. In this situation, the quality of data acquired by A/D-converters and the generation of analog control signals by D/A-converters is of major importance for the overall performance of a system. ... Zie: Summary

  17. Signal sampling techniques for data acquisition in process control

    NARCIS (Netherlands)

    Laan, Marten Derk van der

    1995-01-01

    In computing sytems employed for data acquisition and process control, communication with the controlled processes is mainly taking place via analog signal lines. In this situation, the quality of data acquired by A/D-converters and the generation of analog control signals by D/A-converters is of ma

  18. A Markov chain technique for determining the acquisition behavior of a digital tracking loop

    Science.gov (United States)

    Chadwick, H. D.

    1972-01-01

    An iterative procedure is presented for determining the acquisition behavior of discrete or digital implementations of a tracking loop. The technique is based on the theory of Markov chains and provides the cumulative probability of acquisition in the loop as a function of time in the presence of noise and a given set of initial condition probabilities. A digital second-order tracking loop to be used in the Viking command receiver for continuous tracking of the command subcarrier phase was analyzed using this technique, and the results agree closely with experimental data.

  19. Spacing Techniques in Second Language Vocabulary Acquisition: Short-Term Gains vs. Long-Term Memory

    Science.gov (United States)

    Schuetze, Ulf

    2015-01-01

    This article reports the results of two experiments using the spacing technique (Leitner, 1972; Landauer & Bjork, 1978) in second language vocabulary acquisition. In the past, studies in this area have produced mixed results attempting to differentiate between massed, uniform and expanded intervals of spacing (Balota, Duchek, & Logan,…

  20. Spacing Techniques in Second Language Vocabulary Acquisition: Short-Term Gains vs. Long-Term Memory

    Science.gov (United States)

    Schuetze, Ulf

    2015-01-01

    This article reports the results of two experiments using the spacing technique (Leitner, 1972; Landauer & Bjork, 1978) in second language vocabulary acquisition. In the past, studies in this area have produced mixed results attempting to differentiate between massed, uniform and expanded intervals of spacing (Balota, Duchek, & Logan,…

  1. Use of software engineering techniques in the design of the ALEPH data acquisition system

    Energy Technology Data Exchange (ETDEWEB)

    Charity, T.; McClatchey, R.; Harvey, J.

    1987-08-01

    The SASD methodology is being used to provide a rigorous design framework for various components of the ALEPH data acquisition system. The Entity-Relationship data model is used to describe the layout and configuration of the control and acquisition systems and detector components. State transition diagrams are used to specify control applications such as run control and resource management and data flow diagrams assist in decomposing software tasks and defining interfaces between processes. These techniques encourage rigorous software design leading to enhanced functionality and reliability. Improved documentation and communication ensures continuity over the system life-cycle and simplifies project management.

  2. 3D Image Acquisition System Based on Shape from Focus Technique

    Directory of Open Access Journals (Sweden)

    Pierre Gouton

    2013-04-01

    Full Text Available This paper describes the design of a 3D image acquisition system dedicated to natural complex scenes composed of randomly distributed objects with spatial discontinuities. In agronomic sciences, the 3D acquisition of natural scene is difficult due to the complex nature of the scenes. Our system is based on the Shape from Focus technique initially used in the microscopic domain. We propose to adapt this technique to the macroscopic domain and we detail the system as well as the image processing used to perform such technique. The Shape from Focus technique is a monocular and passive 3D acquisition method that resolves the occlusion problem affecting the multi-cameras systems. Indeed, this problem occurs frequently in natural complex scenes like agronomic scenes. The depth information is obtained by acting on optical parameters and mainly the depth of field. A focus measure is applied on a 2D image stack previously acquired by the system. When this focus measure is performed, we can create the depth map of the scene.

  3. Reliable Wireless Data Acquisition and Control Techniques within Nuclear Hot Cell Facilities

    Energy Technology Data Exchange (ETDEWEB)

    Kurtz, J.L.; Tulenko, J.

    2000-09-20

    On this NEER project the University of Florida has investigated and applied advanced communications techniques to address data acquisition and control problems within the Fuel Conditioning Facility (FCF) of Argonne National Laboratory-West (ANL-W) in Idaho Falls. The goals of this project have been to investigate and apply wireless communications techniques to solve the problem of communicating with and controlling equipment and systems within a nuclear hot cell facility with its attendant high radiation levels. Different wireless techniques, including radio frequency, infrared and power line communications were reviewed. For each technique, the challenges of radiation-hardened implementation were addressed. In addition, it has been a project goal to achieve the highest level of system reliability to ensure safe nuclear operations. Achievement of these goals would allow the eventual elimination of through-the-wall, hardwired cabling that is currently employed in the hot cell, along wit h all of the attendant problems that limit measurement mobility and flexibility.

  4. Phase lock acquisition for sampled data PLLs using the sweep technique

    Science.gov (United States)

    Aguirre, S.; Brown, D. H.; Hurd, W. J.

    1986-01-01

    Simulation results of the swept-acquisition performance of residual carrier phase-locked loops (PLLs) are reported. The loops investigated are sampled data counterparts of the continuous time type II and III loops currently in use in Deep Space Network receivers. It was found that sweep rates of 0.2 B(sub L)(2) to 0.4 B(sub L)(2) Hz/s can be used, depending on the loop parameters and loop signal-to-noise ratio (SNR), where B(sub L) is the one-sided loop noise bandwidth. Type III loops are shown to be not as reliable as type II loops for acquisition using this technique, especially at low SNRs.

  5. A Programmed Training Technique That Uses Reinforcement to Facilitate Acquisition and Retention in Brain-Damaged Patients

    Science.gov (United States)

    Dolan, Michael P.; Norton, James C.

    1977-01-01

    Hospitalized brain-damaged patients were Ss in a study designed to evaluate the effectiveness of a treatment technique used with contingent reinforcement to facilitate acquisition and retention of environmentally relevant information. (Editor)

  6. Contrast-enhanced MR angiography utilizing parallel acquisition techniques in renal artery stenosis detection

    Energy Technology Data Exchange (ETDEWEB)

    Slanina, Martin, E-mail: slaninajicin@seznam.c [Department of Radiology, Charles University Prague, Medical Faculty and Teaching Hospital in Hradec Kralove, Sokolska 581, Hradec Kralove 500 05 (Czech Republic); Zizka, Jan; Klzo, Ludovit; Lojik, Miroslav [Department of Radiology, Charles University Prague, Medical Faculty and Teaching Hospital in Hradec Kralove, Sokolska 581, Hradec Kralove 500 05 (Czech Republic)

    2010-07-15

    Significant renal artery stenosis (RAS) is a potentially curable cause of renovascular hypertension and/or renal impairment. It is caused by either atherosclerosis or fibromuscular dysplasia. Correct and timely diagnosis remains a diagnostic challenge. MR angiography (MRA) as a minimally invasive method seems to be suitable for RAS detection, however, its diagnostic value widely differs in the literature (sensitivity 62-100% and specificity 75-100%). The aim of our prospective study was to compare the diagnostic value of contrast-enhanced MRA utilizing parallel acquisition techniques in the detection of significant RAS with digital subtraction angiography (DSA). A total of 78 hypertensive subjects with suspected renal artery stenosis were examined on a 1.5 Tesla MR system using a body array coil. Bolus tracking was used to monitor the arrival of contrast agent to the abdominal aorta. The MRA sequence parameters were as follows: TR 3.7 ms; TE 1.2 ms; flip angle 25{sup o}; acquisition time 18 s; voxel size 1.1 mm x 1.0 mm x 1.1 mm; centric k-space sampling; parallel acquisition technique with acceleration factor of 2 (GRAPPA). Renal artery stenosis of 60% and more was considered hemodynamically significant. The results of MRA were compared to digital subtraction angiography serving as a standard of reference. Sensitivity and specificity of MRA in the detection of hemodynamically significant renal artery stenosis were 90% and 96%, respectively. Prevalence of RAS was 39% in our study population. Contrast-enhanced MRA with high spatial resolution offers sufficient sensitivity and specificity for screening of RAS.

  7. Diffusion MRI of the neonate brain: acquisition, processing and analysis techniques

    Energy Technology Data Exchange (ETDEWEB)

    Pannek, Kerstin [University of Queensland, Centre for Clinical Research, Brisbane (Australia); University of Queensland, School of Medicine, Brisbane (Australia); University of Queensland, Centre for Advanced Imaging, Brisbane (Australia); Guzzetta, Andrea [IRCCS Stella Maris, Department of Developmental Neuroscience, Calambrone Pisa (Italy); Colditz, Paul B. [University of Queensland, Centre for Clinical Research, Brisbane (Australia); University of Queensland, Perinatal Research Centre, Brisbane (Australia); Rose, Stephen E. [University of Queensland, Centre for Clinical Research, Brisbane (Australia); University of Queensland, Centre for Advanced Imaging, Brisbane (Australia); University of Queensland Centre for Clinical Research, Royal Brisbane and Women' s Hospital, Brisbane (Australia)

    2012-10-15

    Diffusion MRI (dMRI) is a popular noninvasive imaging modality for the investigation of the neonate brain. It enables the assessment of white matter integrity, and is particularly suited for studying white matter maturation in the preterm and term neonate brain. Diffusion tractography allows the delineation of white matter pathways and assessment of connectivity in vivo. In this review, we address the challenges of performing and analysing neonate dMRI. Of particular importance in dMRI analysis is adequate data preprocessing to reduce image distortions inherent to the acquisition technique, as well as artefacts caused by head movement. We present a summary of techniques that should be used in the preprocessing of neonate dMRI data, and demonstrate the effect of these important correction steps. Furthermore, we give an overview of available analysis techniques, ranging from voxel-based analysis of anisotropy metrics including tract-based spatial statistics (TBSS) to recently developed methods of statistical analysis addressing issues of resolving complex white matter architecture. We highlight the importance of resolving crossing fibres for tractography and outline several tractography-based techniques, including connectivity-based segmentation, the connectome and tractography mapping. These techniques provide powerful tools for the investigation of brain development and maturation. (orig.)

  8. Effects of various event building techniques on data acquisition system architectures

    Energy Technology Data Exchange (ETDEWEB)

    Barsotti, E.; Booth, A.; Bowden, M.

    1990-04-01

    The preliminary specifications for various new detectors throughout the world including those at the Superconducting Super Collider (SSC) already make it clear that existing event building techniques will be inadequate for the high trigger and data rates anticipated for these detectors. In the world of high-energy physics many approaches have been taken to solving the problem of reading out data from a whole detector and presenting a complete event to the physicist, while simultaneously keeping deadtime to a minimum. This paper includes a review of multiprocessor and telecommunications interconnection networks and how these networks relate to event building in general, illustrating advantages of the various approaches. It presents a more detailed study of recent research into new event building techniques which incorporate much greater parallelism to better accommodate high data rates. The future in areas such as front-end electronics architectures, high speed data links, event building and online processor arrays is also examined. Finally, details of a scalable parallel data acquisition system architecture being developed at Fermilab are given. 35 refs., 31 figs., 1 tab.

  9. Integration and comparison of different acquisition techniques for landslide monitoring: Cancia landslide case study

    Science.gov (United States)

    Masiero, Andrea; Fissore, Francesca; Degetto, Massimo; Piermattei, Livia; Guarnieri, Alberto; Mezzomo, Rizieri; Gregoretti, Carlo; Piragnolo, Marco; Pirotti, Francesco; Vettore, Antonio

    2017-04-01

    Terrain instability, landslides and other phenomena mostly caused by hydrogeological risk, often cause damages to human infrastructures, roads and other transport lines: given the recent developments in surveying, electronics and mobile instrumentation, the quest for automated or semi-automated early warning systems is continuously increasing in order to provide reliable technological solutions to reduce risks for both human lives and human building and infrastructures. This work deals with the monitoring a specific area of interest, a landslide located in Cancia (Belluno, Italy). This case study is characterized by the presence of several roads close to the landslide area: in particular, one of them intersects with the landslide. The closeness between landslide and human used areas (e.g. roads) motivate the interest of public authorities in order to reduce risks related to the landslide. To this aim, "Provincia di Belluno, Servizio Difesa del Suolo" actively contributed to this work by providing aerial imagery data of the region of interest. Accessing a reliable reconstruction of certain landslides can be complex due to the difficulty for humans to reach certain areas: often only part of the area of interest can be acquired with highly accurate ground surveying (e.g. terrestrial laser scanning (TLS)), whereas other methods should be considered in order to obtain estimates of the remaining parts of the landslide. Recently, the spread of low cost drones is leading to a growing interest in the choice of unmanned aerial vehicles (UAVs) to acquire aerial imagery, hence enabling low cost photogrammetric reconstruction of the area. Despite being an attractive solution because of the clear convenience in terms of cost and acquisition time, its accuracy has typically not reached that of TLS surveying so far. This paper considers the possibility of comparing and integrating different acquisition techniques (TLS, aerial and close-range photogrammetry) in order to reach the

  10. Application of Chang's attenuation correction technique for single-photon emission computed tomography partial angle acquisition of Jaszczak phantom

    Directory of Open Access Journals (Sweden)

    Krishnendu Saha

    2016-01-01

    Full Text Available The acquisition and processing of the Jaszczak phantom is a recommended test by the American College of Radiology for evaluation of gamma camera system performance. To produce the reconstructed phantom image for quality evaluation, attenuation correction is applied. The attenuation of counts originating from the center of the phantom is greater than that originating from the periphery of the phantom causing an artifactual appearance of inhomogeneity in the reconstructed image and complicating phantom evaluation. Chang's mathematical formulation is a common method of attenuation correction applied on most gamma cameras that do not require an external transmission source such as computed tomography, radionuclide sources installed within the gantry of the camera or a flood source. Tomographic acquisition can be obtained in two different acquisition modes for dual-detector gamma camera; one where the two detectors are at 180° configuration and acquire projection images for a full 360°, and the other where the two detectors are positioned at a 90° configuration and acquire projections for only 180°. Though Chang's attenuation correction method has been used for 360° angle acquisition, its applicability for 180° angle acquisition remains a question with one vendor's camera software producing artifacts in the images. This work investigates whether Chang's attenuation correction technique can be applied to both acquisition modes by the development of a Chang's formulation-based algorithm that is applicable to both modes. Assessment of attenuation correction performance by phantom uniformity analysis illustrates improved uniformity with the proposed algorithm (22.6% compared to the camera software (57.6%.

  11. Development and application of a high speed digital data acquisition technique to study steam bubble collapse using particle image velocimetry

    Energy Technology Data Exchange (ETDEWEB)

    Schmidl, W.D.

    1992-08-01

    The use of a Particle Image Velocimetry (PIV) method, which uses digital cameras for data acquisition, for studying high speed fluid flows is usually limited by the digital camera's frame acquisition rate. The velocity of the fluid under study has to be limited to insure that the tracer seeds suspended in the fluid remain in the camera's focal plane for at least two consecutive images. However, the use of digital cameras for data acquisition is desirable to simplify and expedite the data analysis process. A technique was developed which will measure fluid velocities with PIV techniques using two successive digital images and two different framing rates simultaneously. The first part of the method will measure changes which occur to the flow field at the relatively slow framing rate of 53.8 ms. The second part will measure changes to the same flow field at the relatively fast framing rate of 100 to 320 [mu]s. The effectiveness of this technique was tested by studying the collapse of steam bubbles in a subcooled tank of water, a relatively high speed phenomena. The tracer particles were recorded and velocity vectors for the fluid were obtained far from the steam bubble collapse.

  12. Development and application of a high speed digital data acquisition technique to study steam bubble collapse using particle image velocimetry

    Energy Technology Data Exchange (ETDEWEB)

    Schmidl, W.D.

    1992-08-01

    The use of a Particle Image Velocimetry (PIV) method, which uses digital cameras for data acquisition, for studying high speed fluid flows is usually limited by the digital camera`s frame acquisition rate. The velocity of the fluid under study has to be limited to insure that the tracer seeds suspended in the fluid remain in the camera`s focal plane for at least two consecutive images. However, the use of digital cameras for data acquisition is desirable to simplify and expedite the data analysis process. A technique was developed which will measure fluid velocities with PIV techniques using two successive digital images and two different framing rates simultaneously. The first part of the method will measure changes which occur to the flow field at the relatively slow framing rate of 53.8 ms. The second part will measure changes to the same flow field at the relatively fast framing rate of 100 to 320 {mu}s. The effectiveness of this technique was tested by studying the collapse of steam bubbles in a subcooled tank of water, a relatively high speed phenomena. The tracer particles were recorded and velocity vectors for the fluid were obtained far from the steam bubble collapse.

  13. Combined acquisition technique (CAT for neuroimaging of multiple sclerosis at low specific absorption rates (SAR.

    Directory of Open Access Journals (Sweden)

    Armin Biller

    Full Text Available PURPOSE: To compare a novel combined acquisition technique (CAT of turbo-spin-echo (TSE and echo-planar-imaging (EPI with conventional TSE. CAT reduces the electromagnetic energy load transmitted for spin excitation. This radiofrequency (RF burden is limited by the specific absorption rate (SAR for patient safety. SAR limits restrict high-field MRI applications, in particular. MATERIAL AND METHODS: The study was approved by the local Medical Ethics Committee. Written informed consent was obtained from all participants. T2- and PD-weighted brain images of n = 40 Multiple Sclerosis (MS patients were acquired by CAT and TSE at 3 Tesla. Lesions were recorded by two blinded, board-certificated neuroradiologists. Diagnostic equivalence of CAT and TSE to detect MS lesions was evaluated along with their SAR, sound pressure level (SPL and sensations of acoustic noise, heating, vibration and peripheral nerve stimulation. RESULTS: Every MS lesion revealed on TSE was detected by CAT according to both raters (Cohen's kappa of within-rater/across-CAT/TSE lesion detection κCAT = 1.00, at an inter-rater lesion detection agreement of κLES = 0.82. CAT reduced the SAR burden significantly compared to TSE (p<0.001. Mean SAR differences between TSE and CAT were 29.0 (± 5.7 % for the T2-contrast and 32.7 (± 21.9 % for the PD-contrast (expressed as percentages of the effective SAR limit of 3.2 W/kg for head examinations. Average SPL of CAT was no louder than during TSE. Sensations of CAT- vs. TSE-induced heating, noise and scanning vibrations did not differ. CONCLUSION: T2-/PD-CAT is diagnostically equivalent to TSE for MS lesion detection yet substantially reduces the RF exposure. Such SAR reduction facilitates high-field MRI applications at 3 Tesla or above and corresponding protocol standardizations but CAT can also be used to scan faster, at higher resolution or with more slices. According to our data, CAT is no more uncomfortable than TSE scanning.

  14. Magnetic resonance imaging acquisition techniques intended to decrease movement artefact in paediatric brain imaging: a systematic review

    Energy Technology Data Exchange (ETDEWEB)

    Woodfield, Julie [University of Edinburgh, Child Life and Health, Edinburgh (United Kingdom); Kealey, Susan [Western General Hospital, Department of Neuroradiology, Edinburgh (United Kingdom)

    2015-08-15

    Attaining paediatric brain images of diagnostic quality can be difficult because of young age or neurological impairment. The use of anaesthesia to reduce movement in MRI increases clinical risk and cost, while CT, though faster, exposes children to potentially harmful ionising radiation. MRI acquisition techniques that aim to decrease movement artefact may allow diagnostic paediatric brain imaging without sedation or anaesthesia. We conducted a systematic review to establish the evidence base for ultra-fast sequences and sequences using oversampling of k-space in paediatric brain MR imaging. Techniques were assessed for imaging time, occurrence of movement artefact, the need for sedation, and either image quality or diagnostic accuracy. We identified 24 relevant studies. We found that ultra-fast techniques had shorter imaging acquisition times compared to standard MRI. Techniques using oversampling of k-space required equal or longer imaging times than standard MRI. Both ultra-fast sequences and those using oversampling of k-space reduced movement artefact compared with standard MRI in unsedated children. Assessment of overall diagnostic accuracy was difficult because of the heterogeneous patient populations, imaging indications, and reporting methods of the studies. In children with shunt-treated hydrocephalus there is evidence that ultra-fast MRI is sufficient for the assessment of ventricular size. (orig.)

  15. Magnetic resonance imaging acquisition techniques intended to decrease movement artefact in paediatric brain imaging: a systematic review.

    Science.gov (United States)

    Woodfield, Julie; Kealey, Susan

    2015-08-01

    Attaining paediatric brain images of diagnostic quality can be difficult because of young age or neurological impairment. The use of anaesthesia to reduce movement in MRI increases clinical risk and cost, while CT, though faster, exposes children to potentially harmful ionising radiation. MRI acquisition techniques that aim to decrease movement artefact may allow diagnostic paediatric brain imaging without sedation or anaesthesia. We conducted a systematic review to establish the evidence base for ultra-fast sequences and sequences using oversampling of k-space in paediatric brain MR imaging. Techniques were assessed for imaging time, occurrence of movement artefact, the need for sedation, and either image quality or diagnostic accuracy. We identified 24 relevant studies. We found that ultra-fast techniques had shorter imaging acquisition times compared to standard MRI. Techniques using oversampling of k-space required equal or longer imaging times than standard MRI. Both ultra-fast sequences and those using oversampling of k-space reduced movement artefact compared with standard MRI in unsedated children. Assessment of overall diagnostic accuracy was difficult because of the heterogeneous patient populations, imaging indications, and reporting methods of the studies. In children with shunt-treated hydrocephalus there is evidence that ultra-fast MRI is sufficient for the assessment of ventricular size.

  16. A Study of the Techniques of Automatic Abstracting and Knowledge Acquisition Systems

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    . However, the application of LADIES is limited for its knowledge bases. And it is difficult to use in other fields because the knowledge bases are setup manually. So we investigate the techniques of automatic knowledge acquisition in order to solve the above problems to some extent. In the second part, we introduce the basic ideas of AKA and some Machine Learning (ML) methods which AKA applies. Then we propose a comprehensive dictionary model that contains grammar, semantic and pragmatic information of words. And we investigate a strategy of automatic learning pragmatic information for words. Also we put forward another strategy of automatic learning rule of salience sentences in texts and based on it, we establish an AA system LADIES-NEW. Eventually, we suggest a AKA-based AA system model called hierarchical feature extracting AA system model.

  17. The Role and Nature of Anti-Tamper Techniques in U.S. Defense Acquisition

    Science.gov (United States)

    1999-01-01

    derial systernr" protection plan that affords adequate that a broader acquisition program protection. The pro- interpretation of gram protection plan...Ildentify critall Idntf the 111 IdNtf the1 1 Idnt1 atakL Jentify ImpactsL~b Identify new technologies r threats f lulnerabilitiesl 1 scenario Iŕ if...time through means available on the open second step is to recpurenam’f shold market. select a prelimi- r bca.-- In contrast, consider the case of

  18. Design techniques for developing a computerized instrumentation test plan. [for wind tunnel test data acquisition system

    Science.gov (United States)

    Burnett, S. Kay; Forsyth, Theodore J.; Maynard, Everett E.

    1987-01-01

    The development of a computerized instrumentation test plan (ITP) for the NASA/Ames Research Center National Full Scale Aerodynamics Complex (NFAC) is discussed. The objective of the ITP program was to aid the instrumentation engineer in documenting the configuration and calibration of data acquisition systems for a given test at any of four low speed wind tunnel facilities (Outdoor Aerodynamic Research Facility, 7 x 10, 40 x 80, and 80 x 120) at the NFAC. It is noted that automation of the ITP has decreased errors, engineering hours, and setup time while adding a higher level of consistency and traceability.

  19. Low frequency noise elimination technique for 24-bit Σ-Δ data acquisition systems

    Science.gov (United States)

    Qu, Shao-Bo; Robert, Olivier; Lognonné, Philippe; Zhou, Ze-Bing; Yang, Shan-Qing

    2015-03-01

    Low frequency 1/f noise is one of the key limiting factors of high precision measurement instruments. In this paper, digital correlated double sampling is implemented to reduce the offset and low frequency 1/f noise of a data acquisition system with 24-bit sigma delta (Σ-Δ) analog to digital converter (ADC). The input voltage is modulated by cross-coupled switches, which are synchronized to the sampling clock, and converted into digital signal by ADC. By using a proper switch frequency, the unwanted parasitic signal frequencies generated by the switches are avoided. The noise elimination processing is made through the principle of digital correlated double sampling, which is equivalent to a time shifted subtraction for the sampled voltage. The low frequency 1/f noise spectrum density of the data acquisition system is reduced to be flat down to the measurement frequency lower limit, which is about 0.0001 Hz in this paper. The noise spectrum density is eliminated by more than 60 dB at 0.0001 Hz, with a residual noise floor of (9 ± 2) nV/Hz1/2 which is limited by the intrinsic white noise floor of the ADC above its corner frequency.

  20. Clinical applications of quantitative proteomics using targeted and untargeted data-independent acquisition techniques.

    Science.gov (United States)

    Meyer, Jesse G; Schilling, Birgit

    2017-05-01

    While selected/multiple-reaction monitoring (SRM or MRM) is considered the gold standard for quantitative protein measurement, emerging data-independent acquisition (DIA) using high-resolution scans have opened a new dimension of high-throughput, comprehensive quantitative proteomics. These newer methodologies are particularly well suited for discovery of biomarker candidates from human disease samples, and for investigating and understanding human disease pathways. Areas covered: This article reviews the current state of targeted and untargeted DIA mass spectrometry-based proteomic workflows, including SRM, parallel-reaction monitoring (PRM) and untargeted DIA (e.g., SWATH). Corresponding bioinformatics strategies, as well as application in biological and clinical studies are presented. Expert commentary: Nascent application of highly-multiplexed untargeted DIA, such as SWATH, for accurate protein quantification from clinically relevant and disease-related samples shows great potential to comprehensively investigate biomarker candidates and understand disease.

  1. Austempered Ductile Iron Manufacturing Data Acquisition Process with the Use of Semantic Techniques

    Directory of Open Access Journals (Sweden)

    Wilk-Kołodziejczyk D.

    2016-12-01

    Full Text Available The aim of this work was to propose a methodology supporting the task of collecting the comparative data on studies of the mechanical properties of ADI. Collecting of research data is an important step in the process of finding the optimum design solutions for newly made products - experimental data allow us properly calibrate the manufacturing process of ADI to let the final product achieve the required properties. Parameters of the ADI production process, i.e. the time and temperature of austenitising and austempering, as well as the alloying elements added to ductile iron affect the ADI properties. The design process can use research data collected, among others, from the Web. As stated in the article, the process of data acquisition can be supported by semantic technologies, including ontologies which are descriptive logic formalism.

  2. A novel anthropomorphic flow phantom for the quantitative evaluation of prostate DCE-MRI acquisition techniques

    Science.gov (United States)

    Knight, Silvin P.; Browne, Jacinta E.; Meaney, James F.; Smith, David S.; Fagan, Andrew J.

    2016-10-01

    A novel anthropomorphic flow phantom device has been developed, which can be used for quantitatively assessing the ability of magnetic resonance imaging (MRI) scanners to accurately measure signal/concentration time-intensity curves (CTCs) associated with dynamic contrast-enhanced (DCE) MRI. Modelling of the complex pharmacokinetics of contrast agents as they perfuse through the tumour capillary network has shown great promise for cancer diagnosis and therapy monitoring. However, clinical adoption has been hindered by methodological problems, resulting in a lack of consensus regarding the most appropriate acquisition and modelling methodology to use and a consequent wide discrepancy in published data. A heretofore overlooked source of such discrepancy may arise from measurement errors of tumour CTCs deriving from the imaging pulse sequence itself, while the effects on the fidelity of CTC measurement of using rapidly-accelerated sequences such as parallel imaging and compressed sensing remain unknown. The present work aimed to investigate these features by developing a test device in which ‘ground truth’ CTCs were generated and presented to the MRI scanner for measurement, thereby allowing for an assessment of the DCE-MRI protocol to accurately measure this curve shape. The device comprised a four-pump flow system wherein CTCs derived from prior patient prostate data were produced in measurement chambers placed within the imaged volume. The ground truth was determined as the mean of repeat measurements using an MRI-independent, custom-built optical imaging system. In DCE-MRI experiments, significant discrepancies between the ground truth and measured CTCs were found for both tumorous and healthy tissue-mimicking curve shapes. Pharmacokinetic modelling revealed errors in measured K trans, v e and k ep values of up to 42%, 31%, and 50% respectively, following a simple variation of the parallel imaging factor and number of signal averages in the acquisition

  3. A Contrastive Lexical Approach to Second Language Acquisition: A Theoretical Framework and Related Techniques

    Science.gov (United States)

    Maftoon, Parviz; Ziafar, Meisam

    2014-01-01

    Despite criticisms set against methods by postmethodologists who believe that teaching methods must be cast aside, new methods can be proposed that better meet learners' needs as a continuation of the chain of former methods introduced in the past. The present study proposes some language teaching techniques after introducing the theoretical…

  4. Construction of Network Fault Simulation Platform and Event Samples Acquisition Techniques for Event Correlation

    Institute of Scientific and Technical Information of China (English)

    2001-01-01

    Event correlation is one key technique in network fault management. For the event sample acqui sition problem in event correlation, a novel approach is proposed to collect the samples by constructing net work simtmulation platform. The platform designed can set kinds of network faults according to user's demand and generate a lot of network fault events, which will benefit the research on efficient event correlation tech niques.

  5. Two-dimensional radial acquisition technique with density adaption in sodium MRI.

    Science.gov (United States)

    Konstandin, Simon; Nagel, Armin M; Heiler, Patrick M; Schad, Lothar R

    2011-04-01

    Conventional 2D radial projections suffer from losses in signal-to-noise ratio efficiency because of the nonuniform k-space sampling. In this study, a 2D projection reconstruction method with variable gradient amplitudes is presented to cover the k-space uniformly. The gradient is designed to keep the average sampling density constant. By this, signal-to-noise ratio is increased, and the linear form of the radial trajectory is kept. The simple gradient design and low hardware requirements in respect of slew rate allow an easy implementation at MR scanners. Measurements with the density-adapted 2D radial trajectory were compared with the conventional projection reconstruction method. It is demonstrated that the density-adapted 2D radial trajectory technique provides higher signal-to-noise ratio (up to 28% in brain tissue), less blurring, and fewer artifacts in the presence of magnetic field inhomogeneities than imaging with the conventional 2D radial trajectory scheme. The presented sequence is well-suited for electrocardiographically gated sodium heart MRI and other applications with short relaxation times. Copyright © 2010 Wiley-Liss, Inc.

  6. Technique for real-time frontal face image acquisition using stereo system

    Science.gov (United States)

    Knyaz, Vladimir A.; Vizilter, Yuri V.; Kudryashov, Yuri I.

    2013-04-01

    Most part of existing systems for face recognition is usually based on two-dimensional images. And the quality of recognition is rather high for frontal images of face. But for other kind of images the quality decreases significantly. It is necessary to compensate for the effect of a change in the posture of a person (the camera angle) for correct operation of such systems. There are methods of transformation of 2D image of the person to the canonical orientation. The efficiency of these methods depends on the accuracy of determination of specific anthropometric points. Problems can arise for cases of partly occlusion of the person`s face. Another approach is to have a set of person images for different view angles for the further processing. But a need for storing and processing a large number of two-dimensional images makes this method considerably time-consuming. The proposed technique uses stereo system for fast generation of person face 3D model and obtaining face image in given orientation using this 3D model. Real-time performance is provided by implementing and graph cut methods for face surface 3D reconstruction and applying CUDA software library for parallel calculation.

  7. Sinusoidal echo-planar imaging with parallel acquisition technique for reduced acoustic noise in auditory fMRI.

    Science.gov (United States)

    Zapp, Jascha; Schmitter, Sebastian; Schad, Lothar R

    2012-09-01

    To extend the parameter restrictions of a silent echo-planar imaging (sEPI) sequence using sinusoidal readout (RO) gradients, in particular with increased spatial resolution. The sound pressure level (SPL) of the most feasible configurations is compared to conventional EPI having trapezoidal RO gradients. We enhanced the sEPI sequence by integrating a parallel acquisition technique (PAT) on a 3 T magnetic resonance imaging (MRI) system. The SPL was measured for matrix sizes of 64 × 64 and 128 × 128 pixels, without and with PAT (R = 2). The signal-to-noise ratio (SNR) was examined for both sinusoidal and trapezoidal RO gradients. Compared to EPI PAT, the SPL could be reduced by up to 11.1 dB and 5.1 dB for matrix sizes of 64 × 64 and 128 × 128 pixels, respectively. The SNR of sinusoidal RO gradients is lower by a factor of 0.96 on average compared to trapezoidal RO gradients. The sEPI PAT sequence allows for 1) increased resolution, 2) expanded RO frequency range toward lower frequencies, which is in general beneficial for SPL, or 3) shortened TE, TR, and RO train length. At the same time, it generates lower SPL compared to conventional EPI for a wide range of RO frequencies while having the same imaging parameters. Copyright © 2012 Wiley Periodicals, Inc.

  8. Software Acquisition Program Dynamics

    Science.gov (United States)

    2011-10-24

    techniques to avoid these problems The Objective • Improve acquisition program staff decision-making, and thus improve acquisition program outcomes...classroom training, eLearning , certification, and more—to serve the needs of customers and partners worldwide.

  9. Estimation of organ-absorbed radiation doses during 64-detector CT coronary angiography using different acquisition techniques and heart rates: a phantom study

    Energy Technology Data Exchange (ETDEWEB)

    Matsubara, Kosuke; Koshida, Kichiro; Kawashima, Hiroko (Dept. of Quantum Medical Technology, Faculty of Health Sciences, Kanazawa Univ., Kanazawa (Japan)), email: matsuk@mhs.mp.kanazawa-u.ac.jp; Noto, Kimiya; Takata, Tadanori; Yamamoto, Tomoyuki (Dept. of Radiological Technology, Kanazawa Univ. Hospital, Kanazawa (Japan)); Shimono, Tetsunori (Dept. of Radiology, Hoshigaoka Koseinenkin Hospital, Hirakata (Japan)); Matsui, Osamu (Dept. of Radiology, Faculty of Medicine, Kanazawa Univ., Kanazawa (Japan))

    2011-07-15

    Background: Though appropriate image acquisition parameters allow an effective dose below 1 mSv for CT coronary angiography (CTCA) performed with the latest dual-source CT scanners, a single-source 64-detector CT procedure results in a significant radiation dose due to its technical limitations. Therefore, estimating the radiation doses absorbed by an organ during 64-detector CTCA is important. Purpose: To estimate the radiation doses absorbed by organs located in the chest region during 64-detector CTCA using different acquisition techniques and heart rates. Material and Methods: Absorbed doses for breast, heart, lung, red bone marrow, thymus, and skin were evaluated using an anthropomorphic phantom and radiophotoluminescence glass dosimeters (RPLDs). Electrocardiogram (ECG)-gated helical and ECG-triggered non-helical acquisitions were performed by applying a simulated heart rate of 60 beats per minute (bpm) and ECG-gated helical acquisitions using ECG modulation (ECGM) of the tube current were performed by applying simulated heart rates of 40, 60, and 90 bpm after placing RPLDs on the anatomic location of each organ. The absorbed dose for each organ was calculated by multiplying the calibrated mean dose values of RPLDs with the mass energy coefficient ratio. Results: For all acquisitions, the highest absorbed dose was observed for the heart. When the helical and non-helical acquisitions were performed by applying a simulated heart rate of 60 bpm, the absorbed doses for heart were 215.5, 202.2, and 66.8 mGy for helical, helical with ECGM, and non-helical acquisitions, respectively. When the helical acquisitions using ECGM were performed by applying simulated heart rates of 40, 60, and 90 bpm, the absorbed doses for heart were 178.6, 139.1, and 159.3 mGy, respectively. Conclusion: ECG-triggered non-helical acquisition is recommended to reduce the radiation dose. Also, controlling the patients' heart rate appropriately during ECG-gated helical acquisition with

  10. THE EFFECT OF VARIOUS TRAINING TECHNIQUES ON THE ACQUISITION OF THE CONCEPT OF CONSERVATION OF SUBSTANCE. FINAL REPORT.

    Science.gov (United States)

    MERMELSTEIN, EGON; AND OTHERS

    THE STUDY ASCERTAINED WHETHER VARIOUS TRAINING PROCEDURES CAN INFLUENCE THE ACQUISITION OF THE "PIAGETIAN" CONCEPT OF CONSERVATION OF SUBSTANCE. EQUAL NUMBERS OF MALE AND FEMALE, CAUCASIAN, KINDERGARTEN CHILDREN WERE RANDOMLY ASSIGNED TO FOUR EXPERIMENTAL AND TWO CONTROL GROUPS. THE TRAINING CONDITIONS WERE COGNITIVE CONFLICT, LANGUAGE…

  11. MR assessment of left ventricular function: quantitative comparison of fast imaging employing steady-state acquisition (FIESTA) with fast gradient echo cine technique.

    Science.gov (United States)

    Li, Wei; Stern, Jessica S; Mai, Vu M; Pierchala, Linda N; Edelman, Robert R; Prasad, Pottumarthi V

    2002-11-01

    To evaluate the agreement of fast imaging employing steady-state acquisition (FIESTA) cine technique with segmented k-space fast gradient echo (GRE) cine technique when using them for assessment of cardiac function. Eleven MR cine studies were performed on six healthy volunteers and five patients, using FIESTA and fast GRE techniques. The quantitative measurements of ventricular function obtained from the two techniques were compared. The data analysis was performed by two observers independently. Compared to fast GRE cine technique, FIESTA cine technique consistently resulted in higher end-diastolic volume (10.2%) and end-systolic volume (21.6%), but lower myocardial mass of left ventricle (19.2%) and ejection fraction (9.9%). The stroke volume obtained from the two techniques was very close. The primary explanation for this variability is that the two techniques have different mechanisms on establishing signal contrast. Compared to fast GRE technique, FIESTA provides significantly different results when using it for assessment of left ventricular function. It is important to consider this difference in the assessment of cardiac function. Copyright 2002 Wiley-Liss, Inc.

  12. Measurement of eye lens dose for Varian On-Board Imaging with different cone-beam computed tomography acquisition techniques.

    Science.gov (United States)

    Deshpande, Sudesh; Dhote, Deepak; Thakur, Kalpna; Pawar, Amol; Kumar, Rajesh; Kumar, Munish; Kulkarni, M S; Sharma, S D; Kannan, V

    2016-01-01

    The objective of this work was to measure patient eye lens dose for different cone-beam computed tomography (CBCT) acquisition protocols of Varian's On-Board Imaging (OBI) system using optically stimulated luminescence dosimeter (OSLD) and to study the variation in eye lens dose with patient geometry and distance of isocenter to the eye lens. During the experimental measurements, OSLD was placed on the patient between the eyebrows of both eyes in line of nose during CBCT image acquisition to measure eye lens doses. The eye lens dose measurements were carried out for three different cone-beam acquisition protocols (standard dose head, low-dose head [LDH], and high-quality head [HQH]) of Varian OBI. Measured doses were correlated with patient geometry and distance between isocenter and eye lens. Measured eye lens doses for standard head and HQH protocols were in the range of 1.8-3.2 mGy and 4.5-9.9 mGy, respectively. However, the measured eye lens dose for the LDH protocol was in the range of 0.3-0.7 mGy. The measured data indicate that eye lens dose to patient depends on the selected imaging protocol. It was also observed that eye lens dose does not depend on patient geometry but strongly depends on distance between eye lens and treatment field isocenter. However, undoubted advantages of imaging system should not be counterbalanced by inappropriate selection of imaging protocol, especially for very intense imaging protocol.

  13. Whole-heart cine MRI in a single breath-hold. A compressed sensing accelerated 3D acquisition technique for assessment of cardiac function

    Energy Technology Data Exchange (ETDEWEB)

    Wech, T.; Koestler, H. [Wuerzburg Univ. (Germany). Inst. of Radiology; Wuerzburg Univ. (Germany). Comprehensive Heart Failure Center; Pickl, W.; Tran-Gia, J.; Ritter, C.; Hahn, D. [Wuerzburg Univ. (Germany). Inst. of Radiology; Beer, M. [Wuerzburg Univ. (Germany). Inst. of Radiology; Graz Univ. (Austria). University Hospital Radiology

    2014-01-15

    Purpose: The aim of this study was to perform functional MR imaging of the whole heart in a single breath-hold using an undersampled 3 D trajectory for data acquisition in combination with compressed sensing for image reconstruction. Materials and Methods: Measurements were performed using an SSFP sequence on a 3 T whole-body system equipped with a 32-channel body array coil. A 3 D radial stack-of-stars sampling scheme was utilized enabling efficient undersampling of the k-space and thereby accelerating data acquisition. Compressed sensing was applied for the reconstruction of the missing data. A validation study was performed based on a fully sampled dataset acquired by standard Cartesian cine imaging of 2 D slices on a healthy volunteer. The results were investigated with regard to systematic errors and resolution losses possibly introduced by the developed reconstruction. Subsequently, the proposed technique was applied for in-vivo functional cardiac imaging of the whole heart in a single breath-hold of 27 s. The developed technique was tested on three healthy volunteers to examine its reproducibility. Results: By means of the results of the simulation (temporal resolution: 47 ms, spatial resolution: 1.4 x 1.4 x 8 mm, 3 D image matrix: 208 x 208 x 10), an overall acceleration factor of 10 has been found where the compressed sensing reconstructed image series shows only very low systematic errors and a slight in-plane resolution loss of 15 %. The results of the in-vivo study (temporal resolution: 40.5 ms, spatial resolution: 2.1 x 2.1 x 8 mm, 3 D image matrix: 224 x 224 x 12) performed with an acceleration factor of 10.7 confirm the overall good image quality of the presented technique for undersampled acquisitions. Conclusion: The combination of 3 D radial data acquisition and model-based compressed sensing reconstruction allows high acceleration factors enabling cardiac functional imaging of the whole heart within only one breath-hold. The image quality in the

  14. Measurement of eye lens dose for Varian On-Board Imaging with different cone-beam computed tomography acquisition techniques

    Directory of Open Access Journals (Sweden)

    Sudesh Deshpande

    2016-01-01

    Full Text Available The objective of this work was to measure patient eye lens dose for different cone-beam computed tomography (CBCT acquisition protocols of Varian′s On-Board Imaging (OBI system using optically stimulated luminescence dosimeter (OSLD and to study the variation in eye lens dose with patient geometry and distance of isocenter to the eye lens. During the experimental measurements, OSLD was placed on the patient between the eyebrows of both eyes in line of nose during CBCT image acquisition to measure eye lens doses. The eye lens dose measurements were carried out for three different cone-beam acquisition protocols (standard dose head, low-dose head [LDH], and high-quality head [HQH] of Varian OBI. Measured doses were correlated with patient geometry and distance between isocenter and eye lens. Measured eye lens doses for standard head and HQH protocols were in the range of 1.8-3.2 mGy and 4.5-9.9 mGy, respectively. However, the measured eye lens dose for the LDH protocol was in the range of 0.3-0.7 mGy. The measured data indicate that eye lens dose to patient depends on the selected imaging protocol. It was also observed that eye lens dose does not depend on patient geometry but strongly depends on distance between eye lens and treatment field isocenter. However, undoubted advantages of imaging system should not be counterbalanced by inappropriate selection of imaging protocol, especially for very intense imaging protocol.

  15. Magnetic resonance imaging of the brain in children with headache: the clinical relevance with modern acquisition techniques.

    Science.gov (United States)

    Streibert, Phillipp Fridolin; Piroth, Werner; Mansour, Michael; Haage, Patrick; Langer, Thorsten; Borusiak, Peter

    2011-12-01

    The aim of this study was to evaluate the frequency of abnormal findings in magnetic resonance imaging (MRI) in children with headache, the clinical relevance of these findings, and whether more sophisticated technologies also result in more relevant abnormal findings. The MRIs of 1004 children with age ranging from 1 to 17 years were retrospectively analyzed. Children who were investigated with established sequences (n = 419) were compared with those examined with state-of-the-art MRI acquisition technology (n = 585). In 216/1004 investigations, MRI was performed because of headache (74/216 with established sequences, 142/216 with state-of-the-art acquisition technology). In 114/216 (52.8%) patients with headache, the MRI was abnormal with relevant findings in 23/114 patients and findings without clinical relevance in 91/114 children. A higher incidence of abnormal findings than in previous reports was found but there was only limited clinical gain of information using modern sequences in children with headache.

  16. Quantitative analysis of the breath-holding half-Fourier acquisition single-shot turbo spin-echo technique in abdominal MRI

    Science.gov (United States)

    Dong, Kyung-Rae; Goo, Eun-Hoe; Lee, Jae-Seung; Chung, Woon-Kwan

    2013-01-01

    A consecutive series of 50 patients (28 males and 22 females) who underwent hepatic magnetic resonance imaging (MRI) from August to December 2011 were enrolled in this study. The appropriate parameters for abdominal MRI scans were determined by comparing the images (TE = 90 and 128 msec) produced using the half-Fourier acquisition single-shot turbo spin-echo (HASTE) technique at different signal acquisition times. The patients consisted of 15 normal patients, 25 patients with a hepatoma and 10 patients with a hemangioma. The TE in a single patient was set to either 90 msec or 128 msec. This was followed by measurements using the four normal rendering methods of the biliary tract system and the background signal intensity using the maximal signal intensity techniques in the liver, spleen, pancreas, gallbladder, fat, muscles and hemangioma. The signal-to-noise and the contrast-to-noise ratios were obtained. The image quality was assessed subjectively, and the results were compared. The signal-to-noise and the contrast-to-noise ratios were significantly higher at TE = 128 msec than at TE = 90 when diseases of the liver, spleen, pancreas, gallbladder, and fat and muscles, hepatocellular carcinomas and hemangiomas, and rendering the hepatobiliary tract system based on the maximum signal intensity technique were involved (p < 0.05). In addition, the presence of artifacts, the image clarity and the overall image quality were excellent at TE = 128 msec (p < 0.05). In abdominal MRI, the breath-hold half-Fourier acquisition single-shot turbo spin-echo (HASTE) was found to be effective in illustrating the abdominal organs for TE = 128 msec. Overall, the image quality at TE = 128 msec was better than that at TE = 90 msec due to the improved signal-to-noise (SNR) and contrast-to-noise (CNR) ratios. Overall, the HASTE technique for abdominal MRI based on a high-magnetic field (3.0 T) at a TE of 128 msec can provide useful data.

  17. Machine-assisted verification of latent fingerprints: first results for nondestructive contact-less optical acquisition techniques with a CWL sensor

    Science.gov (United States)

    Hildebrandt, Mario; Kiltz, Stefan; Krapyvskyy, Dmytro; Dittmann, Jana; Vielhauer, Claus; Leich, Marcus

    2011-11-01

    A machine-assisted analysis of traces from crime scenes might be possible with the advent of new high-resolution non-destructive contact-less acquisition techniques for latent fingerprints. This requires reliable techniques for the automatic extraction of fingerprint features from latent and exemplar fingerprints for matching purposes using pattern recognition approaches. Therefore, we evaluate the NIST Biometric Image Software for the feature extraction and verification of contact-lessly acquired latent fingerprints to determine potential error rates. Our exemplary test setup includes 30 latent fingerprints from 5 people in two test sets that are acquired from different surfaces using a chromatic white light sensor. The first test set includes 20 fingerprints on two different surfaces. It is used to determine the feature extraction performance. The second test set includes one latent fingerprint on 10 different surfaces and an exemplar fingerprint to determine the verification performance. This utilized sensing technique does not require a physical or chemical visibility enhancement of the fingerprint residue, thus the original trace remains unaltered for further investigations. No particular feature extraction and verification techniques have been applied to such data, yet. Hence, we see the need for appropriate algorithms that are suitable to support forensic investigations.

  18. The Use of Biofeedback to Augment the Acquisition of Skills in Performing Joint Mobilization Techniques among Physical Therapy Students

    Science.gov (United States)

    Timmerberg, Jean Fitzpatrick

    2011-01-01

    Despite the frequent use of joint mobilizations and the available evidence of its effectiveness as a treatment for various musculoskeletal disorders, it is a technique that has been shown to have great variability within and between raters. This variability is believed to occur because of differences between therapists' ability to perceive…

  19. Problem Based Learning Technique and Its Effect on Acquisition of Linear Programming Skills by Secondary School Students in Kenya

    Science.gov (United States)

    Nakhanu, Shikuku Beatrice; Musasia, Amadalo Maurice

    2015-01-01

    The topic Linear Programming is included in the compulsory Kenyan secondary school mathematics curriculum at form four. The topic provides skills for determining best outcomes in a given mathematical model involving some linear relationship. This technique has found application in business, economics as well as various engineering fields. Yet many…

  20. Minimum SNR and acquisition for bias-free estimation of fractional anisotropy in diffusion tensor imaging - a comparison of two analytical techniques and field strengths.

    Science.gov (United States)

    Seo, Youngseob; Wang, Zhiyue J; Morriss, Michael C; Rollins, Nancy K

    2012-10-01

    Although it is known that low signal-to-noise ratio (SNR) can affect tensor metrics, few studies reporting disease or treatment effects on fractional anisotropy (FA) report SNR; the implicit assumption is that SNR is adequate. However, the level at which low SNR causes bias in FA may vary with tissue FA, field strength and analytical methodology. We determined the SNR thresholds at 1.5 T vs. 3 T in regions of white matter (WM) with different FA and compared FA derived using manual region-of-interest (ROI) analysis to tract-based spatial statistics (TBSS), an operator-independent whole-brain analysis tool. Using ROI analysis, SNR thresholds on our hardware-software magnetic resonance platforms were 25 at 1.5 T and 20 at 3 T in the callosal genu (CG), 40 at 1.5 and 3 T in the anterior corona radiata (ACR), and 50 at 1.5 T and 70 at 3 T in the putamen (PUT). Using TBSS, SNR thresholds were 20 at 1.5 T and 3 T in the CG, and 35 at 1.5 T and 40 at 3 T in the ACR. Below these thresholds, the mean FA increased logarithmically, and the standard deviations widened. Achieving bias-free SNR in the PUT required at least nine acquisitions at 1.5 T and six acquisitions at 3 T. In the CG and ACR, bias-free SNR was achieved with at least three acquisitions at 1.5 T and one acquisition at 3 T. Using diffusion tensor imaging (DTI) to study regions of low FA, e.g., basal ganglia, cerebral cortex, and WM in the abnormal brain, SNR should be documented. SNR thresholds below which FA is biased varied with the analytical technique, inherent tissue FA and field strength. Studies using DTI to study WM injury should document that bias-free SNR has been achieved in the region of the brain being studied as part of quality control. Copyright © 2012 Elsevier Inc. All rights reserved.

  1. [Consensus document on ultrasound training in Intensive Care Medicine. Care process, use of the technique and acquisition of professional skills].

    Science.gov (United States)

    Ayuela Azcárate, J M; Clau-Terré, F; Vicho Pereira, R; Guerrero de Mier, M; Carrillo López, A; Ochagavia, A; López Pérez, J M; Trenado Alvarez, J; Pérez, L; Llompart-Pou, J A; González de Molina, F J; Fojón, S; Rodríguez Salgado, A; Martínez Díaz, M C; Royo Villa, C; Romero Bermejo, F J; Ruíz Bailén, M; Arroyo Díez, M; Argueso García, M; Fernández Fernández, J L

    2014-01-01

    Ultrasound has become an essential tool in assisting critically ill patients. His knowledge, use and instruction requires a statement by scientific societies involved in its development and implementation. Our aim are to determine the use of the technique in intensive care medicine, clinical situations where its application is recommended, levels of knowledge, associated responsibility and learning process also implement the ultrasound technique as a common tool in all intensive care units, similar to the rest of european countries. The SEMICYUC's Working Group Cardiac Intensive Care and CPR establishes after literature review and scientific evidence, a consensus document which sets out the requirements for accreditation in ultrasound applied to the critically ill patient and how to acquire the necessary skills. Training and learning requires a structured process within the specialty. The SEMICYUC must agree to disclose this document, build relationships with other scientific societies and give legal cover through accreditation of the training units, training courses and different levels of training.

  2. Data acquisition techniques for exploiting the uniqueness of the time-of-flight mass spectrometer: Application to sampling pulsed gas systems

    Science.gov (United States)

    Lincoln, K. A.

    1980-01-01

    Mass spectra are produced in most mass spectrometers by sweeping some parameter within the instrument as the sampled gases flow into the ion source. It is evident that any fluctuation in the gas during the sweep (mass scan) of the instrument causes the output spectrum to be skewed in its mass peak intensities. The time of flight mass spectrometer (TOFMS) with its fast, repetitive mode of operation produces spectra without skewing or varying instrument parameters and because all ion species are ejected from the ion source simultaneously, the spectra are inherently not skewed despite rapidly changing gas pressure or composition in the source. Methods of exploiting this feature by utilizing fast digital data acquisition systems, such as transient recorders and signal averagers which are commercially available are described. Applications of this technique are presented including TOFMS sampling of vapors produced by both pulsed and continuous laser heating of materials.

  3. Whole-organ perfusion of the pancreas using dynamic volume CT in patients with primary pancreas carcinoma: acquisition technique, post-processing and initial results

    Energy Technology Data Exchange (ETDEWEB)

    Kandel, Sonja; Kloeters, Christian; Meyer, Henning; Hein, Patrick; Rogalla, Patrik [Charite - Universitaetsmedizin Berlin, Department of Radiology, Campus Charite Mitte, Berlin (Germany); Hilbig, Andreas [Charite - University Medicine, Medical Clinic III - Hematology and Oncology, Campus Virchow Klinikum, Berlin (Germany)

    2009-11-15

    The purpose of this study was to evaluate a whole-organ perfusion protocol of the pancreas in patients with primary pancreas carcinoma and to analyse perfusion differences between normal and diseased pancreatic tissue. Thirty patients with primary pancreatic malignancy were imaged on a 320-slice CT unit. Twenty-nine cancers were histologically proven. CT data acquisition was started manually after contrast-material injection (8 ml/s, 350 mg iodine/ml) and dynamic density measurements in the right ventricle. After image registration, perfusion was determined with the gradient-relationship technique and volume regions-of-interest were defined for perfusion measurements. Contrast time-density curves and perfusion maps were generated. Statistical analysis was performed using the Kolmogorov-Smirnov test for analysis of normal distribution and Kruskal-Wallis test (nonparametric ANOVA) with Bonferroni correction for multiple stacked comparisons. In all 30 patients the entire pancreas was imaged, and registration could be completed in all cases. Perfusion of pancreatic carcinomas was significantly lower than of normal pancreatic tissue (P < 0.001) and could be visualized on colored perfusion maps. The 320-slice CT allows complete dynamic visualization of the pancreas and enables calculation of whole-organ perfusion maps. Perfusion imaging carries the potential to improve detection of pancreatic cancers due to the perfusion differences. (orig.)

  4. Single breath-hold assessment of cardiac function using an accelerated 3D single breath-hold acquisition technique - comparison of an intravascular and extravascular contrast agent

    Directory of Open Access Journals (Sweden)

    Makowski Marcus R

    2012-07-01

    Full Text Available Abstract Background Cardiovascular magnetic resonance (CMR is the current gold standard for the assessment of left ventricular (LV function. Repeated breath-holds are needed for standard multi-slice 2D cine steady-state free precession sequences (M2D-SSFP. Accelerated single breath-hold techniques suffer from low contrast between blood pool and myocardium. In this study an intravascular contrast agent was prospectively compared to an extravascular contrast agent for the assessment of LV function using a single-breath-hold 3D-whole-heart cine SSFP sequence (3D-SSFP. Methods LV function was assessed in fourteen patients on a 1.5 T MR-scanner (Philips Healthcare using 32-channel coil technology. Patients were investigated twice using a 3D-SSFP sequence (acquisition time 18–25 s after Gadopentetate dimeglumine (GdD, day 1 and Gadofosveset trisodium (GdT, day 2 administration. Image acquisition was accelerated using sensitivity encoding in both phase encoding directions (4xSENSE. CNR and BMC were both measured between blood and myocardium. The CNR incorporated noise measurements, while the BMC represented the coeffiancy between the signal from blood and myocardium [1]. Contrast to noise ratio (CNR, blood to myocardium contrast (BMC, image quality, LV functional parameters and intra-/interobserver variability were compared. A M2D-SSFP sequence was used as a reference standard on both days. Results All 3D-SSFP sequences were successfully acquired within one breath-hold after GdD and GdT administration. CNR and BMC were significantly (p vs. 23.7 and regression analysis showed a stronger correlation to the reference standard (R2 = 0.92 vs. R2 = 0.71, compared to 3D-SSFP with GdD. Conclusions A single-breath-hold 3D-whole-heart cine SSFP sequence in combination with 32-channel technology and an intravascular contrast agent allows for the accurate and fast assessment of LV function. Trial registration The study was approved by the local

  5. 基于中心频率检测的应答机载波捕获技术%Transponder carrier acquisition technique based on center frequency detection

    Institute of Scientific and Technical Information of China (English)

    张朝杰; 金小军; 姜建文; 金仲和

    2011-01-01

    In the condition of second order phase locked loop using perfect integrator loop filter, the loop center frequency drifts in response to thermal noise when no useful input signal presents. To avoid the problem of loop center frequency drift, the satellite on board transponder's carrier acquisition technique was studied. On the basis of all digital carrier recovery loop receiver architecture using I/Q sub-sampling technique, a center frequency detector was used to control the loop. This architectural solution allows to close the carrier recovery loop only when the uplink carrier signal is detected by the center frequency detector, thus avoiding the drift of center frequency in response to thermal noise at the receiver input. The design method of center frequency detector was given, and the relationship between the probability of missed detection and the probability of false alarm was analyzed. The detector parameter selection was given based on the result of analysis.%针对基于理想型积分环路滤波器的二阶锁相环在无信号输入时,环路中心频率会随热噪声发生漂移的问题,研究了卫星星载测控应答机的载波捕获技术.为解决无信号输入下的环路中心频率漂移问题,在基于正交欠采样技术及全数字载波恢复环的接收机结构基础上,通过一级中心频率检测器控制环路.当检测到上行信号时闭合环路,避免了接收机中心频率在无信号输入时随热噪声发生漂移.给出了中心频率检测器的设计方法,分析了检测器漏检概率和误判概率之间的关系,并在此基础上给出了检测器的具体参数选择依据.

  6. Prospectively ECG-triggered high-pitch spiral acquisition for coronary CT angiography using dual source CT: technique and initial experience

    Energy Technology Data Exchange (ETDEWEB)

    Lell, Michael; Anders, Katharina [University of Erlangen, Diagnostic Radiology, Erlangen (Germany); Marwan, Mohamed; Schepis, Tiziano; Pflederer, Tobias; Kuettner, Axel; Ropers, Dieter; Daniel, Werner G.; Achenbach, Stephan [University of Erlangen, Department of Cardiology, Erlangen (Germany); Flohr, Thomas [CT Division, Siemens Healthcare, Forchheim (Germany); Eberhard-Karls-University, Institute of Diagnostic Radiology, Tuebingen (Germany); Allmendinger, Thomas; Thierfelder, Carsten [CT Division, Siemens Healthcare, Forchheim (Germany); Kalender, Willi; Ertel, Dirk [University of Erlangen, Institute of Medical Physics, Erlangen (Germany)

    2009-11-15

    We evaluated radiation exposure and image quality of a new coronary CT angiography protocol, high-pitch spiral acquisition, using dual source CT (DSCT). Coronary CTA was performed in 25 consecutive patients with a stable heart rate of 60 bpm or less after premedication, using 2 x 128 0.6-mm sections, 38.4-mm collimation width and 0.28-s rotation time. Tube settings were 100 kV/320 mAs and 120 kV/400 mAs for patients below and above 100-kg weight, respectively. Data acquisition was prospectively ECG-triggered at 60% of the R-R interval using a pitch of 3.2 (3.4 for the last 10 patients). Images were reconstructed with 75-ms temporal resolution, 0.6-mm slice thickness and 0.3-mm increment. Image quality was evaluated using a four-point scale (1 = excellent, 4 = unevaluable). Mean range of data acquisition was 113 {+-} 22 mm, mean duration was 268 {+-} 23 ms. Of 363 coronary artery segments, 327 had an image quality score of 1, and only 2 segments were rated as ''unevaluable''. Mean dose-length product (DLP) was 71 {+-} 23 mGy cm, mean effective dose was 1.0 {+-} 0.3 mSv (range 0.78-2.1 mSv). For 21 patients with a body weight below 100 kg, mean DLP was 63 {+-} 5 mGy cm (0.88 {+-} 0.07 mSv; range 0.78-0.97 mSv). Prospectively ECG-triggered high-pitch spiral CT acquisition provides high and stable image quality at very low radiation dose. (orig.)

  7. Mergers + acquisitions.

    Science.gov (United States)

    Hoppszallern, Suzanna

    2002-05-01

    The hospital sector in 2001 led the health care field in mergers and acquisitions. Most deals involved a network augmenting its presence within a specific region or in a market adjacent to its primary service area. Analysts expect M&A activity to increase in 2002.

  8. Language Acquisition in Computers

    OpenAIRE

    Belzner, Megan; Colin-Ellerin, Sean; Roman, Jorge H.

    2012-01-01

    This project explores the nature of language acquisition in computers, guided by techniques similar to those used in children. While existing natural language processing methods are limited in scope and understanding, our system aims to gain an understanding of language from first principles and hence minimal initial input. The first portion of our system was implemented in Java and is focused on understanding the morphology of language using bigrams. We use frequency distributions and differ...

  9. Mergers & Acquisitions

    DEFF Research Database (Denmark)

    Fomcenco, Alex

    and functioning of provisions of European federal corporate law and internationally accepted principles of the law of obligations. This book, however, is not about clarification of the reasons that urge for M&A operations, nor is it about judging the outcome of the transactions. It is about synthesizing......MERGERS & ACQUISITIONS: Counseling and Choice of Method describes and analyzes the current state of law in Europe in regard to some relevant selected elements related to mergers and acquisitions, and the adviser’s counsel in this regard. The focus is aimed and maintained at application......, on the one hand, the methods of M&A and, on the other hand, several selected key elements. Any participating party - as well as their respective advisers - must be aware of these elements prior, throughout, and after the transaction: consideration, succession, taxes and fiscal neutrality, group...

  10. Three-dimensional seismic survey planning based on the newest data acquisition design technique; Saishin no data shutoku design ni motozuku sanjigen jishin tansa keikaku

    Energy Technology Data Exchange (ETDEWEB)

    Minehara, M.; Nakagami, K.; Tanaka, H. [Japan National Oil Corp., Tokyo (Japan). Technology Research Center

    1996-10-01

    Theory of parameter setting for data acquisition is arranged, mainly as to the seismic generating and receiving geometry. This paper also introduces an example of survey planning for three-dimensional land seismic exploration in progress. For the design of data acquisition, fundamental parameters are firstly determined on the basis of the characteristics of reflection records at a given district, and then, the layout of survey is determined. In this study, information through modeling based on the existing interpretation of geologic structures is also utilized, to reflect them for survey specifications. Land three-dimensional seismic survey was designed. Ground surface of the surveyed area consists of rice fields and hilly regions. The target was a nose-shaped structure in the depth about 2,500 m underground. A survey area of 4km{times}5km was set. Records in the shallow layers could not obtained when near offset was not ensured. Quality control of this distribution was important for grasping the shallow structure required. In this survey, the seismic generating point could be ensured more certainly than initially expected, which resulted in the sufficient security of near offset. 2 refs., 2 figs.

  11. 75 FR 57690 - Acquisition Regulation: Sustainable Acquisition

    Science.gov (United States)

    2010-09-22

    ... Parts 907, 923, 936, 952, and 970 RIN 1991-AB95 Acquisition Regulation: Sustainable Acquisition AGENCY... (DOE) is amending the Department of Energy Acquisition Regulation (DEAR) to implement Executive Order... to leverage agency acquisitions to foster markets for sustainable technologies and energy...

  12. Amplitudes, acquisition and imaging

    Energy Technology Data Exchange (ETDEWEB)

    Bloor, Robert

    1998-12-31

    Accurate seismic amplitude information is important for the successful evaluation of many prospects and the importance of such amplitude information is increasing with the advent of time lapse seismic techniques. It is now widely accepted that the proper treatment of amplitudes requires seismic imaging in the form of either time or depth migration. A key factor in seismic imaging is the spatial sampling of the data and its relationship to the imaging algorithms. This presentation demonstrates that acquisition caused spatial sampling irregularity can affect the seismic imaging and perturb amplitudes. Equalization helps to balance the amplitudes, and the dealing strategy improves the imaging further when there are azimuth variations. Equalization and dealiasing can also help with the acquisition irregularities caused by shot and receiver dislocation or missing traces. 2 refs., 2 figs.

  13. Mergers & Acquisitions

    DEFF Research Database (Denmark)

    Fomcenco, Alex

    This dissertation is a legal dogmatic thesis, the goal of which is to describe and analyze the current state of law in Europe in regard to some relevant selected elements related to mergers and acquisitions, and the adviser’s counsel in this regard. Having regard to the topic of the dissertation...... the focus is aimed and maintained at application and functioning of provisions of European federal corporate law and internationally accepted principles of the law of obligations. This study, however, is not about clarification of the reasons that urge for M&A operations, nor is it about judging the results...... of the transactions. This study is about synthesizing, on the one hand, the methods of M&A, and, on the other hand, several selected key elements, which any participating party, as well as their respective advisers, must be aware of, prior, throughout, and after the transaction: consideration, succession, taxes...

  14. Rapid acquisition of operant conditioning in 5-day-old rat pups: a new technique articulating suckling-related motor activity and milk reinforcement.

    Science.gov (United States)

    Arias, Carlos; Spear, Norman E; Molina, Juan Carlos; Molina, Agustin; Molina, Juan Carlos

    2007-09-01

    Newborn rats are capable of obtaining milk by attaching to a surrogate nipple. During this procedure pups show a gradual increase in head and forelimb movements oriented towards the artificial device that are similar to those observed during nipple attachment. In the present study the probability of execution of these behaviors was analyzed as a function of their contingency with intraoral milk infusion using brief training procedures (15 min). Five-day-old pups were positioned in a smooth surface having access to a touch-sensitive sensor. Physical contact with the sensor activated an infusion pump which served to deliver intraoral milk reinforcement (Paired group). Yoked controls received the reinforcer when Paired neonates touched the sensor. Paired pups trained under a continuous reinforcement schedule emitted significantly more responses than Yoked controls following two (Experiment 1) or one training session (Experiment 2). These differences were also observed during an extinction session conducted immediately after training. The level of maternal deprivation before training (3 or 6 hr) or the volume of milk delivered (1.0 or 1.5 microl per pulse) did not affect acquisition or extinction performances. In addition, it was observed that the rate of responding of Paired pups during the early phase of the extinction session significantly predicted subsequent levels of acceptance of the reinforcer. These results indicate that the frequency of suckling-related behaviors can be rapidly modified by means of associative operant processes. The operant procedure here described represents an alternative tool for the ontogenetic analysis of self-administration or behavior processes of seeking.

  15. MR-sialography: optimisation and evaluation of an ultra-fast sequence in parallel acquisition technique and different functional conditions of salivary glands; MR-Sialographie: Optimierung und Bewertung ultraschneller Sequenzen mit paralleler Bildgebung und oraler Stimulation

    Energy Technology Data Exchange (ETDEWEB)

    Habermann, C.R.; Cramer, M.C.; Aldefeld, D.; Weiss, F.; Kaul, M.G.; Adam, G. [Radiologisches Zentrum, Klinik und Poliklinik fuer Diagnostische und Interventionelle Radiologie, Universitaetsklinikum Hamburg-Eppendorf (Germany); Graessner, J. [Siemens Medical Systems, Hamburg (Germany); Reitmeier, F.; Jaehne, M. [Kopf- und Hautzentrum, Klinik und Poliklinik fuer Hals-, Nasen- und Ohrenheilkunde, Universitaetsklinikum Hamburg-Eppendorf (Germany); Petersen, K.U. [Zentrum fuer Psychosoziale Medizin, Klinik und Poliklinik fuer Psychiatrie und Psychotherapie, Universitaetsklinikum Hamburg-Eppendorf (Germany)

    2005-04-01

    Purpose: To optimise a fast sequence for MR-sialography and to compare a parallel and non-parallel acquisition technique. Additionally, the effect of oral stimulation regarding the image quality was evaluated. Material and Methods: All examinations were performed by using a 1.5-T superconducting system. After developing a sufficient sequence for MR-sialography, a single-shot turbo-spin-echo sequence (ss-TSE) with an acquisition time of 2.8 sec was used in transverse and oblique sagittal orientation in 27 healthy volunteers. All images were performed with and without parallel imaging technique. The assessment of the ductal system of the submandibular and parotid gland was performed using a 1 to 5 visual scale for each side separately. Images were evaluated by four independent experienced radiologists. For statistical evaluation, an ANOVA with post-hoc comparisons was used with an overall two-tailed significance level of P=.05. For evaluation of interobserver variability, an intraclass correlation was computed and correlation >.08 was determined to indicate a high correlation. Results: All parts of salivary excretal ducts could be visualised in all volunteers, with an overall rating for all ducts of 2.26 (SD{+-}1.09). Between the four observers a high correlation could be obtained with an intraclass correlation of 0.9475. A significant influence regarding the slice angulations could not be obtained (p=0.74). In all healthy volunteers the visibility of excretory ducts improved significantly after oral application of a Sialogogum (p<0.001; {eta}{sup 2}=0.049). The use of a parallel imaging technique did not lead to an improvement of visualisation, showing a significant loss of image quality compared to an acquistion technique without parallel imaging (p<0.001; {eta}{sup 2}=0.013). Conclusion: The optimised ss-TSE MR-sialography seems to be a fast and sufficient technique for visualisation of excretory ducts of the main salivary glands, with no elaborate post

  16. The Application of GPS-RTK Technique in the Land Acquisition Measurement of Highway%GPS-RTK技术在高速公路征地测量中的应用

    Institute of Scientific and Technical Information of China (English)

    刘家庆; 杨楠

    2012-01-01

    The article introduces the concept,component and character of the real-time dynamic phase difference technique of GPS-RTK global position system.It analyzes the problem exists in the traditional land acquisition measurement and discusses the preparation,field work and inside management of using GPS-RTK technique.Through comparison analysis,the article points out the advantages of using GPS-RTK technique in speed,accuracy,traceability,accounting and control ability.%文章介绍了GPS-RTK全球定位系统实时动态相位差分定位技术的概念、组成及特点,分析了传统征地测量方法存在的问题,阐述了利用GPS-RTK技术进行征地测量的前期准备工作、外业及内业工作内容,并通过对比分析,指出了GPS-RTK技术在速度、精度、可追溯性、审计、可控性方面的优势。

  17. 2017 NAIP Acquisition Map

    Data.gov (United States)

    Farm Service Agency, Department of Agriculture — Planned States for 2017 NAIP acquisition and acquisition status layer (updated daily). Updates to the acquisition seasons may be made during the season to...

  18. 2016 NAIP Acquisition Map

    Data.gov (United States)

    Farm Service Agency, Department of Agriculture — Planned States for 2016 NAIP acquisition and acquisition status layer (updated daily). Updates to the acquisition seasons may be made during the season to...

  19. Data Acquisition and Flux Calculations

    DEFF Research Database (Denmark)

    Rebmann, C.; Kolle, O; Heinesch, B;

    2012-01-01

    In this chapter, the basic theory and the procedures used to obtain turbulent fluxes of energy, mass, and momentum with the eddy covariance technique will be detailed. This includes a description of data acquisition, pretreatment of high-frequency data and flux calculation....

  20. 基于3S技术的农业信息采集监测系统研究%The Study of Agricultural Information Acquisition and Monitoring System Based on 3S Technique

    Institute of Scientific and Technical Information of China (English)

    于雅辉

    2012-01-01

    随着以遥感(RS)、全球定位系统(GPS)、地理信息系统(GIS)、网络技术和计算机集成技术为核心的高新技术的快速发展,使得大面积、快速、准确掌握和预报农业生产信息成为可能。本文介绍了利用上述高新技术建立农业信息采集监测系统的技术路线。%The rapid development of high technology with remote sensing,global positioning system,geographic information system,network technique and computer integrated technique at its core,makes it possible to master and forecast agricultural production information rapidly and accurately in a large area.This paper puts forward the technical route of establishing agricultural information acquisition and monitoring system using the high technology mentioned above.

  1. Wearable Intelligent Environment Parameters Acquisition System Based on Bluetooth Technique%基于蓝牙技术的可穿戴式智能环境参数采集系统

    Institute of Scientific and Technical Information of China (English)

    孙广维; 杨小天

    2015-01-01

    提出了一种基于蓝牙技术的无线可穿戴式环境参数获取系统,其采用智能手持终端(例如手机),实现了将个人用户周边环境信息的实时采集,融合了可穿戴式传感器、物联网技术以及智能终端等技术。系统集成了多种传感器,可检测温湿度、光照、气压、PM2.5等。另外,该系统很容易通过增加传感器种类和数目实现扩展,还可以与其他系统通过广域网进行无线组网,实现一个大型环境参数监测无线传感器网络,将会在环境监测、天气、自然灾害预警方面得到广泛发展。%This paper presents a wearable environment parameters acquisition system based on Bluetooth technique, which achieves the individual user environment information acquisition by using intelligent handheld terminal ( such as a mobile phone) , showing the fu-sion of technologies of wearable sensors, network of things and intelligent terminal. The system with many sensors integrated can detect the temperature and humidity, light, pressure, PM2. 5, etc. In addition, the system is very easy to achieve expansion by adding types and numbers of sensors, also form wireless network with other systems through wide area network. The realization of a large-scale wire-less sensor network of environment parameters monitoring will be widely developed in environmental monitoring, weather and natural disaster prediction.

  2. Syntax acquisition.

    Science.gov (United States)

    Crain, Stephen; Thornton, Rosalind

    2012-03-01

    Every normal child acquires a language in just a few years. By 3- or 4-years-old, children have effectively become adults in their abilities to produce and understand endlessly many sentences in a variety of conversational contexts. There are two alternative accounts of the course of children's language development. These different perspectives can be traced back to the nature versus nurture debate about how knowledge is acquired in any cognitive domain. One perspective dates back to Plato's dialog 'The Meno'. In this dialog, the protagonist, Socrates, demonstrates to Meno, an aristocrat in Ancient Greece, that a young slave knows more about geometry than he could have learned from experience. By extension, Plato's Problem refers to any gap between experience and knowledge. How children fill in the gap in the case of language continues to be the subject of much controversy in cognitive science. Any model of language acquisition must address three factors, inter alia: 1. The knowledge children accrue; 2. The input children receive (often called the primary linguistic data); 3. The nonlinguistic capacities of children to form and test generalizations based on the input. According to the famous linguist Noam Chomsky, the main task of linguistics is to explain how children bridge the gap-Chomsky calls it a 'chasm'-between what they come to know about language, and what they could have learned from experience, even given optimistic assumptions about their cognitive abilities. Proponents of the alternative 'nurture' approach accuse nativists like Chomsky of overestimating the complexity of what children learn, underestimating the data children have to work with, and manifesting undue pessimism about children's abilities to extract information based on the input. The modern 'nurture' approach is often referred to as the usage-based account. We discuss the usage-based account first, and then the nativist account. After that, we report and discuss the findings of several

  3. Data acquisition with direct memory access

    Directory of Open Access Journals (Sweden)

    Iu. Guzun

    1999-08-01

    Full Text Available This paper is concerned about using Direct Memory Access (DMA transfer for real-time data acquisitions from a plug-in data acquisition board Aquarius DSP-1. Since the conversion speed of the modern Analog to Digital Converters is increasevealy, the using of the interrupts for reading of the conversion results becomes impossible. For the data acquisition system, presented in this paper, this speed is up to 100 kS/s. This problem can be successfully solved using DMA technique. We subsequently describe the hardware of the data acquisition board, which has been used to acquire data. Next, have been presented the functions, in C programming language, for programming a data acquisition via DMA. Finally, we present some results obtained using this kind of data acquisitions, and some conclusions.

  4. Acquisition Support Program Overview

    Science.gov (United States)

    2016-06-30

    Principles of Effective Acquisition © 2006 by Carnegie Mellon University page 31 Summary The SEI, through the Acquisition Support Program , works directly...2006 by Carnegie Mellon University page 1 Acquisition Support Program Overview Brian Gallagher Director, Acquisition Support Program 9 March, 2006...MAR 2006 2. REPORT TYPE 3. DATES COVERED 00-00-2006 to 00-00-2006 4. TITLE AND SUBTITLE Acquisition Support Program Overview 5a. CONTRACT

  5. Speed in Acquisitions

    DEFF Research Database (Denmark)

    Meglio, Olimpia; King, David R.; Risberg, Annette

    2017-01-01

    The advantage of speed is often invoked by academics and practitioners as an essential condition during post-acquisition integration, frequently without consideration of the impact earlier decisions have on acquisition speed. In this article, we examine the role speed plays in acquisitions across...... the acquisition process using research organized around characteristics that display complexity with respect to acquisition speed. We incorporate existing research with a process perspective of acquisitions in order to present trade-offs, and consider the influence of both stakeholders and the pre......-deal-completion context on acquisition speed, as well as the organization’s capabilities to facilitating that speed. Observed trade-offs suggest both that acquisition speed often requires longer planning time before an acquisition and that associated decisions require managerial judgement. A framework for improving...

  6. Frequency acquisition techniques for phase locked loop

    CERN Document Server

    Talbot, Daniel

    2012-01-01

    Many good phaselocked loops (PLL) books exist. However, how to acquire the input frequency from an unlocked state is rarely covered. This book explores the methods for achieving this locked state for a variety of conditions. Using a minimum of mathematics, it introduces engineers to performance limitations of phase/frequency detector based PLL, the quadricorrelator method for both continuous and sampled mode, sawtooth ramp-and-sample phase detector, self-sweeping self-extinguishing topology, and sweep methods using quadrature mixer based lock detection. Digital implementations versus analog are also considered.

  7. Language Acquisition in Computers

    CERN Document Server

    Belzner, Megan; Roman, Jorge H

    2012-01-01

    This project explores the nature of language acquisition in computers, guided by techniques similar to those used in children. While existing natural language processing methods are limited in scope and understanding, our system aims to gain an understanding of language from first principles and hence minimal initial input. The first portion of our system was implemented in Java and is focused on understanding the morphology of language using bigrams. We use frequency distributions and differences between them to define and distinguish languages. English and French texts were analyzed to determine a difference threshold of 55 before the texts are considered to be in different languages, and this threshold was verified using Spanish texts. The second portion of our system focuses on gaining an understanding of the syntax of a language using a recursive method. The program uses one of two possible methods to analyze given sentences based on either sentence patterns or surrounding words. Both methods have been i...

  8. Language Acquisition without an Acquisition Device

    Science.gov (United States)

    O'Grady, William

    2012-01-01

    Most explanatory work on first and second language learning assumes the primacy of the acquisition phenomenon itself, and a good deal of work has been devoted to the search for an "acquisition device" that is specific to humans, and perhaps even to language. I will consider the possibility that this strategy is misguided and that language…

  9. Language Acquisition without an Acquisition Device

    Science.gov (United States)

    O'Grady, William

    2012-01-01

    Most explanatory work on first and second language learning assumes the primacy of the acquisition phenomenon itself, and a good deal of work has been devoted to the search for an "acquisition device" that is specific to humans, and perhaps even to language. I will consider the possibility that this strategy is misguided and that language…

  10. Calo trigger acquisition system

    CERN Multimedia

    Franchini, Matteo

    2016-01-01

    Calo trigger acquisition system - Evolution of the acquisition system from a multiple boards system (upper, orange cables) to a single board one (below, light blue cables) where all the channels are collected in a single board.

  11. Modelling live forensic acquisition

    CSIR Research Space (South Africa)

    Grobler, MM

    2009-06-01

    Full Text Available This paper discusses the development of a South African model for Live Forensic Acquisition - Liforac. The Liforac model is a comprehensive model that presents a range of aspects related to Live Forensic Acquisition. The model provides forensic...

  12. Playing at Serial Acquisitions

    NARCIS (Netherlands)

    J.T.J. Smit (Han); T. Moraitis (Thras)

    2010-01-01

    textabstractBehavioral biases can result in suboptimal acquisition decisions-with the potential for errors exacerbated in consolidating industries, where consolidators design serial acquisition strategies and fight escalating takeover battles for platform companies that may determine their future co

  13. 五号桩地区滩浅海高精度三维地震采集技术%3D high-precision seismic acquisition techniques in Wuhaozhuang beach and shallow sea area

    Institute of Scientific and Technical Information of China (English)

    邸志欣; 丁伟; 吕公河; 刘怀山; 段卫星; 刘斌

    2012-01-01

    Wuhaozhuang area is the key and old oil area of Shengli Oilfield for oil-gas exploration in beach and shallow sea. It has great potential on increase in oil reserve and production, but the energy in middle-deep layer of the existing seismic data is weak, and its signal-to-noise ratio is low, so it is hard to meet the requirements for further detailed structure interpretation and reservoir description. Aimed at the characteristics and difficulties of the complex surface and underground conditions, based on complex structure modeling and prestack imaging result analysis, we designed and proved high-precision geometries for seismic acquisition suitable for the beach and shallow sea in Wuhaozhuang area, which ensured seamless data acquisition in the land-beach-shallow-sea area. By studying 'high-efficient dynamite source and using the shooting techniques based on near-surface lithology layering and modeling, the shooting effect of intertidal zone was improved. By studying and testing air gun array parameters, we optimized airgun array mode and shooting depth with good wavelet characteristics and strong energy. The platelike long-tail cone geophone coupler was adopted to improve the seismic wave receiving effect in intertidal zone as well. Besides, the repositioning technology and counter measurements were utilized to improve the positioning accuracy of underwater hydrophone. By jointly using all the techniques and methods, we achieved high-quality seismic data and obvious geological effect in Wuhaozhuang area.%五号桩地区是胜利油田滩浅海油气勘探的重点老区,增储上产的潜力巨大,但以往地震资料中深层能量弱,信噪比较低,无法满足进一步精细构造解释和油藏描述要求.针对该区复杂的地表和地下特点及难点,基于复杂构造模型正演和叠前成像效果分析,设计论证了适合于该区滩浅海高精度地震采集的观测系统形式,确保了全区陆-滩-海资料的无缝连接采集;通过

  14. Through-casing Resistivity Logging Signal Acquisition and Processing Techniques%过套管电阻率测井信号采集与处理方法研究

    Institute of Scientific and Technical Information of China (English)

    严正国; 苏娟

    2012-01-01

    微弱信号检测技术是过套管电阻率测井仪器研制的关键技术难点.采用超低噪声前置放大器、过采样、取样积分/平均、数字相敏检波等技术,使微弱信号的检测精度达到30 nV.设计的前置放大器采用了浮地设计,低输入阻抗的超低噪声放大器具有尽可能低的1/f噪声拐点和良好的低频噪声抑制性能.对微弱信号检测采用过采样技术,用高达16.384 MHz的采样时钟对频率为0.1~10 Hz范围内的信号进行采样,采用delta-sigma技术的A/D转换器,达到了24 bit的采样精度、192 dB的输出信噪比和32 ksps的采样速率.过套管电阻率测井信号采集与处理技术已经应用到过套管电阻率模型机仪器研制中.室内刻度和现场实验结果证明,刻度电阻在0~100Ω范围变化时,测量精度在10%以内.%Weak signal detection is the key technique in developing through-casing resistivity logging tool. In this paper, ultra-low-noise preamplifier, oversampling method, sampling integration and sampling average method, digital phase-sensitive detection technique are applied in detecting logging signals and 30 nV is achieved. The designed preamplifier uses the technique shown in Fig. 2 Ultra-low-noise preamplifier with low input resistance has 1// noise inflection point as low as possible and better low frequency noice suppression ability. The oversampling method is used in weak signal detection, and 16. 384 MHz sampling clock ia used to pick up the signals within the range of 0.1 Hz to 10 Hz. With the delta-sigma A/D converter, the effective resolution is up to 24 bit, output signal-noise ratio 192 dB and sampling rate 32 ksps. The through-casing resistivity logging signal acquisition and processing technique has already been used in the development of the through-casing resistivity logging experiment model. The indoor calibration test and field experiment of the model with those weak signal detection techniques showed that its

  15. Technological Similarity, Post-acquisition R&D Reorganization, and Innovation Performance in Horizontal Acquisition

    DEFF Research Database (Denmark)

    Colombo, Massimo G.; Rabbiosi, Larissa

    2014-01-01

    &D personnel. We rely on PLS techniques to test our theoretical model using detailed information on 31 horizontal acquisitions in high- and medium-tech industries. Our results indicate that in horizontal acquisitions, technological similarity negatively affects post-acquisition innovation performance......This paper aims to disentangle the mechanisms through which technological similarity between acquiring and acquired firms influences innovation in horizontal acquisitions. We develop a theoretical model that links technological similarity to: (i) two key aspects of post-acquisition reorganization...... of acquired R&D operations – the rationalization of the R&D operations and the replacement of the R&D top manager, and (ii) two intermediate effects that are closely associated with the post-acquisition innovation performance of the combined firm – improvements in R&D productivity and disruptions in R...

  16. Dynamic Liver Magnetic Resonance Imaging in Free-Breathing: Feasibility of a Cartesian T1-Weighted Acquisition Technique With Compressed Sensing and Additional Self-Navigation Signal for Hard-Gated and Motion-Resolved Reconstruction.

    Science.gov (United States)

    Kaltenbach, Benjamin; Bucher, Andreas M; Wichmann, Julian L; Nickel, Dominik; Polkowski, Christoph; Hammerstingl, Renate; Vogl, Thomas J; Bodelle, Boris

    2017-06-16

    The aim of this study was to assess the feasibility of a free-breathing dynamic liver imaging technique using a prototype Cartesian T1-weighted volumetric interpolated breathhold examination (VIBE) sequence with compressed sensing and simultaneous acquisition of a navigation signal for hard-gated and motion state-resolved reconstruction. A total of 43 consecutive oncologic patients (mean age, 66 ± 11 years; 44% female) underwent free-breathing dynamic liver imaging for the evaluation of liver metastases from colorectal cancer using a prototype Cartesian VIBE sequence (field of view, 380 × 345 mm; image matrix, 320 × 218; echo time/repetition time, 1.8/3.76 milliseconds; flip angle, 10 degrees; slice thickness, 3.0 mm; acquisition time, 188 seconds) with continuous data sampling and additionally acquired self-navigation signal. Data were iteratively reconstructed using 2 different approaches: first, a hard-gated reconstruction only using data associated to the dominating motion state (CS VIBE, Compressed Sensing VIBE), and second, a motion-resolved reconstruction with 6 different motion states as additional image dimension (XD VIBE, eXtended dimension VIBE). Continuous acquired data were grouped in 16 subsequent time increments with 11.57 seconds each to resolve arterial and venous contrast phases. For image quality assessment, both CS VIBE and XD VIBE were compared with the patient's last staging dynamic liver magnetic resonance imaging including a breathhold (BH) VIBE as reference standard 4.5 ± 1.2 months before. Representative quality parameters including respiratory artifacts were evaluated for arterial and venous phase images independently, retrospectively and blindly by 3 experienced radiologists, with higher scores indicating better examination quality. To assess diagnostic accuracy, same readers evaluated the presence of metastatic lesions for XD VIBE and CS VIBE compared with reference BH examination in a second session. Compared with CS VIBE, XD VIBE

  17. Excessive acquisition in hoarding.

    Science.gov (United States)

    Frost, Randy O; Tolin, David F; Steketee, Gail; Fitch, Kristin E; Selbo-Bruns, Alexandra

    2009-06-01

    Compulsive hoarding (the acquisition of and failure to discard large numbers of possessions) is associated with substantial health risk, impairment, and economic burden. However, little research has examined separate components of this definition, particularly excessive acquisition. The present study examined acquisition in hoarding. Participants, 878 self-identified with hoarding and 665 family informants (not matched to hoarding participants), completed an Internet survey. Among hoarding participants who met criteria for clinically significant hoarding, 61% met criteria for a diagnosis of compulsive buying and approximately 85% reported excessive acquisition. Family informants indicated that nearly 95% exhibited excessive acquisition. Those who acquired excessively had more severe hoarding; their hoarding had an earlier onset and resulted in more psychiatric work impairment days; and they experienced more symptoms of obsessive-compulsive disorder, depression, and anxiety. Two forms of excessive acquisition (buying and free things) each contributed independent variance in the prediction of hoarding severity and related symptoms.

  18. Acquisition IT Integration

    DEFF Research Database (Denmark)

    Henningsson, Stefan; Øhrgaard, Christian

    2015-01-01

    The IT integration of acquisitions consists an important challenge for the many acquiring organizations. Complementing existing research, this paper searches for explanation to differences in acquirers’ abilities for acquisition IT integration in the external of the acquirer, by a study of the use...... of temporary agency workers. Following an analytic induction approach, theoretically grounded in the re-source-based view of the firm, we identify the complimentary and supplementary roles consultants can assume in acquisition IT integration. Through case studies of three acquirers, we investigate how...... of the acquisition IT integration team should consider the balance of these, in practice, commonly mutually excluding needs....

  19. 身体技术论视角下太极拳身体技术的习得--以日本千叶县太极拳教室的质性研究为例%The acquisition of Taijiquan body techniques from the perspectives of body technique theories--Taking the qualitative research of a Taijiquan classroom in Chiba prefecture of Japan for example

    Institute of Scientific and Technical Information of China (English)

    马晟

    2014-01-01

    研究以马塞尔·莫斯、皮埃尔·布尔迪、米歇尔·福柯等人的身体技术理论为基础,以质性研究方法为主要手段,采用参与观察与深度访谈,对日本千叶县太极拳教室中不同水平学员,在太极拳身体技术习得过程中的实际情况进行调查,以检验太极拳身体技术的习得与社会结构,以及与身体抵抗之间的关系。通过研究表明太极拳身体技术的习得不仅是通过权威的模仿、惯习的规则化、规训等社会结构来进行复制,而且还包括身体构造而引发的身体抵抗在内的诸多因素。%Based on body technique theories by MarcellMauss, Pierre Bourdieu and Michel Foucault etc, by using qualitative research methods as main means, and by means of participant observation and in-depth interview, the author investigated the actual conditions of students at different levels in a Taijiquan classroom in Chiba prefecture of Japan in the proves of Taijiquan technique acquisition, so as to test the relations between the acquisition of Tai-jiquan body techniques and social structure as well as body resistance. The author revealed that the acquisition of Taijiquan body techniques is not only copying via such social structures as authority imitation, habit regularization, discipline etc, but also including many factors (including body resistance induced by body structure).

  20. Acquisition Research Program Homepage

    OpenAIRE

    2015-01-01

    Includes an image of the main page on this date and compressed file containing additional web pages. Established in 2003, Naval Postgraduate School’s (NPS) Acquisition Research Program provides leadership in innovation, creative problem solving and an ongoing dialogue, contributing to the evolution of Department of Defense acquisition strategies.

  1. Coring Sample Acquisition Tool

    Science.gov (United States)

    Haddad, Nicolas E.; Murray, Saben D.; Walkemeyer, Phillip E.; Badescu, Mircea; Sherrit, Stewart; Bao, Xiaoqi; Kriechbaum, Kristopher L.; Richardson, Megan; Klein, Kerry J.

    2012-01-01

    A sample acquisition tool (SAT) has been developed that can be used autonomously to sample drill and capture rock cores. The tool is designed to accommodate core transfer using a sample tube to the IMSAH (integrated Mars sample acquisition and handling) SHEC (sample handling, encapsulation, and containerization) without ever touching the pristine core sample in the transfer process.

  2. Robotization in Seismic Acquisition

    NARCIS (Netherlands)

    Blacquière, G.; Berkhout, A.J.

    2013-01-01

    The amount of sources and detectors in the seismic method follows "Moore’s Law of seismic data acquisition", i.e., it increases approximately by a factor of 10 every 10 years. Therefore automation is unavoidable, leading to robotization of seismic data acquisition. Recently, we introduced a new

  3. Second language acquisition

    NARCIS (Netherlands)

    Kootstra, G.J.; Dijkstra, A.F.J.; Starren, M.B.P.

    2015-01-01

    This contribution provides an overview of second language acquisition research from a psycholinguistic perspective. The overview is mainly focused on cross-language interactions during word and sentence production and comprehension at different points in the second-language acquisition process. The

  4. A Survey of Commonsense Knowledge Acquisition

    Institute of Scientific and Technical Information of China (English)

    Liang-Jun Zang; Cong Cao; Ya-Nan Cao; Yu-Ming Wu; Cun-Gen CAO

    2013-01-01

    Collecting massive commonsense knowledge (CSK) for commonsense reasoning has been a long time standing challenge within artificial intelligence research.Numerous methods and systems for acquiring CSK have been developed to overcome the knowledge acquisition bottleneck.Although some specific commonsense reasoning tasks have been presented to allow researchers to measure and compare the performance of their CSK systems,we compare them at a higher level from the following aspects:CSK acquisition task (what CSK is acquired from where),technique used (how can CSK be acquired),and CSK evaluation methods (how to evaluate the acquired CSK).In this survey,we first present a categorization of CSK acquisition systems and the great challenges in the field.Then,we review and compare the CSK acquisition systems in detail.Finally,we conclude the current progress in this field and explore some promising future research issues.

  5. Mergers and Acquisitions

    DEFF Research Database (Denmark)

    Risberg, Annette

    , employee experiences and communication. Mergers and acquisitions remain one of the most common forms of growth, yet they present considerable challenges for the companies and management involved. The effects on stakeholders, including shareholders, managers and employees, must be considered as well......Introduction to the study of mergers and acquisitions. This book provides an understanding of the mergers and acquisitions process, how and why they occur, and also the broader implications for organizations. It presents issues including motives and planning, partner selection, integration...... by editorial commentaries and reflects the important organizational and behavioural aspects which have often been ignored in the past. By providing this in-depth understanding of the mergers and acquisitions process, the reader understands not only how and why mergers and acquisitions occur, but also...

  6. Language acquisition and implication for language change: A computational model.

    OpenAIRE

    Clark, Robert A.J.

    1997-01-01

    Computer modeling techniques, when applied to language acquisition problems, give an often unrealized insight into the diachronic change that occurs in language over successive generations. This paper shows that using assumptions about language acquisition to model successive generations of learners in a computer simulation, can have a drastic effect on the long term changes that occur in a language. More importantly, it shows that slight changes in the acquisition ...

  7. STIS target acquisition

    Science.gov (United States)

    Kraemer, Steve; Downes, Ron; Katsanis, Rocio; Crenshaw, Mike; McGrath, Melissa; Robinson, Rich

    1997-01-01

    We describe the STIS autonomous target acquisition capabilities. We also present the results of dedicated tests executed as part of Cycle 7 calibration, following post-launch improvements to the Space Telescope Imaging Spectrograph (STIS) flight software. The residual pointing error from the acquisitions are < 0.5 CCD pixels, which is better than preflight estimates. Execution of peakups show clear improvement of target centering for slits of width 0.1 sec or smaller. These results may be used by Guest Observers in planning target acquisitions for their STIS programs.

  8. Bootstrapping language acquisition.

    Science.gov (United States)

    Abend, Omri; Kwiatkowski, Tom; Smith, Nathaniel J; Goldwater, Sharon; Steedman, Mark

    2017-07-01

    The semantic bootstrapping hypothesis proposes that children acquire their native language through exposure to sentences of the language paired with structured representations of their meaning, whose component substructures can be associated with words and syntactic structures used to express these concepts. The child's task is then to learn a language-specific grammar and lexicon based on (probably contextually ambiguous, possibly somewhat noisy) pairs of sentences and their meaning representations (logical forms). Starting from these assumptions, we develop a Bayesian probabilistic account of semantically bootstrapped first-language acquisition in the child, based on techniques from computational parsing and interpretation of unrestricted text. Our learner jointly models (a) word learning: the mapping between components of the given sentential meaning and lexical words (or phrases) of the language, and (b) syntax learning: the projection of lexical elements onto sentences by universal construction-free syntactic rules. Using an incremental learning algorithm, we apply the model to a dataset of real syntactically complex child-directed utterances and (pseudo) logical forms, the latter including contextually plausible but irrelevant distractors. Taking the Eve section of the CHILDES corpus as input, the model simulates several well-documented phenomena from the developmental literature. In particular, the model exhibits syntactic bootstrapping effects (in which previously learned constructions facilitate the learning of novel words), sudden jumps in learning without explicit parameter setting, acceleration of word-learning (the "vocabulary spurt"), an initial bias favoring the learning of nouns over verbs, and one-shot learning of words and their meanings. The learner thus demonstrates how statistical learning over structured representations can provide a unified account for these seemingly disparate phenomena. Copyright © 2017 Elsevier B.V. All rights reserved.

  9. Acquisition Workforce Annual Report 2006

    Data.gov (United States)

    General Services Administration — This is the Federal Acquisition Institute's (FAI's) Annual demographic report on the Federal acquisition workforce, showing trends by occupational series, employment...

  10. Acquisition Workforce Annual Report 2008

    Data.gov (United States)

    General Services Administration — This is the Federal Acquisition Institute's (FAI's) Annual demographic report on the Federal acquisition workforce, showing trends by occupational series, employment...

  11. Cross-border Mergers and Acquisitions

    DEFF Research Database (Denmark)

    Wang, Daojuan

    This paper focuses on three topics in cross-border mergers and acquisitions (CBM&As) field: motivations for CBM&As, valuation techniques and CBM&A performance (assessment and the determinants). By taking an overview of what have been found so far in academic field and investigating...

  12. Auditory Processing Disorder and Foreign Language Acquisition

    Science.gov (United States)

    Veselovska, Ganna

    2015-01-01

    This article aims at exploring various strategies for coping with the auditory processing disorder in the light of foreign language acquisition. The techniques relevant to dealing with the auditory processing disorder can be attributed to environmental and compensatory approaches. The environmental one involves actions directed at creating a…

  13. Cross-border Mergers and Acquisitions

    DEFF Research Database (Denmark)

    Wang, Daojuan

    This paper focuses on three topics in cross-border mergers and acquisitions (CBM&As) field: motivations for CBM&As, valuation techniques and CBM&A performance (assessment and the determinants). By taking an overview of what have been found so far in academic field and investigating...

  14. Auditory Processing Disorder and Foreign Language Acquisition

    Science.gov (United States)

    Veselovska, Ganna

    2015-01-01

    This article aims at exploring various strategies for coping with the auditory processing disorder in the light of foreign language acquisition. The techniques relevant to dealing with the auditory processing disorder can be attributed to environmental and compensatory approaches. The environmental one involves actions directed at creating a…

  15. FWS Approved Acquisition Boundaries

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This data layer depicts the external boundaries of lands and waters that are approved for acquisition by the U.S. Fish and Wildlife Service (USFWS) in North America,...

  16. FWS Approved Acquisition Boundaries

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This data layer depicts the external boundaries of lands and waters that are approved for acquisition by the U.S. Fish and Wildlife Service (USFWS) in North...

  17. Acquisition IT Integration

    DEFF Research Database (Denmark)

    Henningsson, Stefan; Øhrgaard, Christian

    2015-01-01

    The IT integration of acquisitions consists an important challenge for the many acquiring organizations. Complementing existing research, this paper searches for explanation to differences in acquirers’ abilities for acquisition IT integration in the external of the acquirer, by a study of the use...... of temporary agency workers. Following an analytic induction approach, theoretically grounded in the re-source-based view of the firm, we identify the complimentary and supplementary roles consultants can assume in acquisition IT integration. Through case studies of three acquirers, we investigate how...... the acquirers appropriate the use of agency workers as part of its acquisition strategy. For the investigated acquirers, assigning roles to agency workers is contingent on balancing the needs of knowledge induction and knowledge retention, as well as experience richness and in-depth under-standing. Composition...

  18. FWS Approved Acquisition Boundaries

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — This data layer depicts the external boundaries of lands and waters that are approved for acquisition by the U.S. Fish and Wildlife Service (USFWS) in North America,...

  19. USB data acquisition solution

    Institute of Scientific and Technical Information of China (English)

    Serges Lemo; Zhu June

    2007-01-01

    @@ 1 Introduction In recent years, USB has evolved from a simple, low-speed peripheral bus for mice, keyboards, and other computer accessories to the bus of choice for more demanding applications, including data acquisition (DAQ).

  20. Knowledge Acquisition for Content Selection

    CERN Document Server

    Reiter, E R; Osman, L; Roff, Y; Reiter, Ehud; Cawsey, Alison; Osman, Liesl; Roff, Yvonne

    1997-01-01

    An important part of building a natural-language generation (NLG) system is knowledge acquisition, that is deciding on the specific schemas, plans, grammar rules, and so forth that should be used in the NLG system. We discuss some experiments we have performed with KA for content-selection rules, in the context of building an NLG system which generates health-related material. These experiments suggest that it is useful to supplement corpus analysis with KA techniques developed for building expert systems, such as structured group discussions and think-aloud protocols. They also raise the point that KA issues may influence architectural design issues, in particular the decision on whether a planning approach is used for content selection. We suspect that in some cases, KA may be easier if other constructive expert-system techniques (such as production rules, or case-based reasoning) are used to determine the content of a generated text.

  1. On the Performance of Code Acquisition in MIMO CDMA Systems

    Science.gov (United States)

    Kim, Sangchoon; An, Jinyoung

    This letter investigates the effects of using multiple transmit antennas on code acquisition for preamble search in the CDMA uplink when MIMO is used for signal transmission and reception. The performance of a ML code acquisition technique in the presence of MIMO channel is analyzed by considering the detection and miss probabilities. The acquisition performance is numerically evaluated on a frequency selective fading channel. It is found that the performance of code acquisition scheme for a SIMO system is better than that for the case of MIMO on the low thresholds in terms of detection performance and MAT.

  2. Post-Acquisition IT Integration

    DEFF Research Database (Denmark)

    Henningsson, Stefan; Yetton, Philip

    2013-01-01

    The extant research on post-acquisition IT integration analyzes how acquirers realize IT-based value in individual acquisitions. However, serial acquirers make 60% of acquisitions. These acquisitions are not isolated events, but are components in growth-by-acquisition programs. To explain how...... serial acquirers realize IT-based value, we develop three propositions on the sequential effects on post-acquisition IT integration in acquisition programs. Their combined explanation is that serial acquirers must have a growth-by-acquisition strategy that includes the capability to improve...... IT integration capabilities, to sustain high alignment across acquisitions and to maintain a scalable IT infrastructure with a flat or decreasing cost structure. We begin the process of validating the three propositions by investigating a longitudinal case study of a growth-by-acquisition program....

  3. Multimodal acquisition of articulatory data: Geometrical and temporal registration

    OpenAIRE

    Aron, Michaël; Berger, Marie-Odile; Kerrien, Erwan; Wrobel-Dautcourt, Brigitte; Potard, Blaise; Laprie, Yves

    2016-01-01

    International audience; Acquisition of dynamic articulatory data is of major importance for studying speech production. It turns out that one technique alone often is not enough to get a correct coverage of the whole vocal tract at a sufficient sampling rate. Ultrasound (US) imaging has been proposed as a good acquisition technique for the tongue surface because it offers a good temporal sampling, does not alter speech production, is cheap and widely available. However, it cannot be used alon...

  4. VERITAS Data Acquisition

    Science.gov (United States)

    Hays, E.

    VERITAS employs a multi-stage data acquisition chain that extends from the VME readout of custom 500 MHz flash ADC electronics to the construction of telescope events and ultimately the compilation of information from each telescope into array level data. These systems provide access to the programming of the channel level triggers and the FADCs. They also ensure the proper synchronization of event information across the array and provide the first level of data quality monitoring. Additionally, the data acquisition includes features to handle the readout of special trigger types and to monitor channel scaler rates. In this paper we describe the software and hardware components of the systems and the protocols used to communicate between the VME, telescope, and array levels. We also discuss the performance of the data acquisition for array operations.

  5. VERITAS Data Acquisition

    CERN Document Server

    Hays, E

    2007-01-01

    VERITAS employs a multi-stage data acquisition chain that extends from the VME readout of custom 500 MS/s flash ADC electronics to the construction of telescope events and ultimately the compilation of information from each telescope into array level data. These systems provide access to the programming of the channel level triggers and the FADCs. They also ensure the proper synchronization of event information across the array and provide the first level of data quality monitoring. Additionally, the data acquisition includes features to handle the readout of special trigger types and to monitor channel scaler rates. In this paper we describe the software and hardware components of the systems and the protocols used to communicate between the VME, telescope, and array levels. We also discuss the performance of the data acquisition for array operations.

  6. Knowledge Transfers following Acquisition

    DEFF Research Database (Denmark)

    Gammelgaard, Jens

    2001-01-01

    Prior relations between the acquiring firm and the target company pave the way for knowledge transfers subsequent to the acquisitions. One major reason is that through the market-based relations the two actors build up mutual trust and simultaneously they learn how to communicate. An empirical...... study of 54 Danish acquisitions taking place abroad from 1994 to 1998 demonstrated that when there was a high level of trust between the acquiring firm and the target firm before the take-over, then medium and strong tie-binding knowledge transfer mechanisms, such as project groups and job rotation...

  7. Web-based data acquisition

    Institute of Scientific and Technical Information of China (English)

    胡旭东; 俞红; 陈鹰

    2002-01-01

    The research work on Web-based long-distance data acquisition (DAQ) is valuable for application to tele-detection machine faults. With an expert system for machine fault detection, faults in a distantly located machine can be diagnosed through the internet. The distant user logs on to the expert system Web page, fills in the requirements, and starts-up the diagnose process. The system then connects to the DAQ server that is installed in the machine, samples data required for diagnoses through the internet, and sends back diagnose results. In such a long-distance system, Web-based DAQ plays an important role by automatic sampling and transferring of data through the internet. We have built an experimental data acquisition system using a National Instruments AT-MIO-16E-10 board running under Ch language environment. In this experimental example, the user can acquire data online. The principle of this experimental method is introduced in this paper. A detailed programming technique is described with an example.

  8. Merger and acquisition medicine.

    Science.gov (United States)

    Powell, G S

    1997-01-01

    This discussion of the ramifications of corporate mergers and acquisitions for employees recognizes that employee adaptation to the change can be a long and complex process. The author describes a role the occupational physician can take in helping to minimize the potential adverse health impact of major organizational change.

  9. Interaction and Language Acquisition

    Institute of Scientific and Technical Information of China (English)

    孙红叶

    2016-01-01

    Based on Long's Interaction Hypothesis (IH), the paper examines the aspects of interaction that might facilitate natu-ralistic language development and goes further to propose features of interaction that could encourage classroom second lan-guage acquisition, in the hope that improved classroom interation will enhance teaching effectiveness in language classroom.

  10. Second Language Acquisition.

    Science.gov (United States)

    McLaughlin, Barry; Harrington, Michael

    1989-01-01

    A distinction is drawn between representational and processing models of second-language acquisition. The first approach is derived primarily from linguistics, the second from psychology. Both fields, it is argued, need to collaborate more fully, overcoming disciplinary narrowness in order to achieve more fruitful research. (GLR)

  11. Competencies: requirements and acquisition

    NARCIS (Netherlands)

    Kuenn, A.C.; Meng, C.M.; Peters, Z.; Verhagen, A.M.C.

    2013-01-01

    Higher education is given the key task to prepare the highly talented among the young to fulfil highly qualified roles in the labour market. Successful labour market performance of graduates is generally associated with the acquisition of the correct competencies. Education as an individual investme

  12. Acquisition of Comparison Constructions

    Science.gov (United States)

    Hohaus, Vera; Tiemann, Sonja; Beck, Sigrid

    2014-01-01

    This article presents a study on the time course of the acquisition of comparison constructions. The order in which comparison constructions (comparatives, measure phrases, superlatives, degree questions, etc.) show up in English- and German-learning children's spontaneous speech is quite fixed. It is shown to be insufficiently determined by…

  13. Surviving mergers & acquisitions.

    Science.gov (United States)

    Dixon, Diane L

    2002-01-01

    Mergers and acquisitions are never easy to implement. The health care landscape is a minefield of failed mergers and uneasy alliances generating great turmoil and pain. But some mergers have been successful, creating health systems that benefit the communities they serve. Five prominent leaders offer their advice on minimizing the difficulties of M&As.

  14. 48 CFR 215.404-1 - Proposal analysis techniques.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Proposal analysis techniques. 215.404-1 Section 215.404-1 Federal Acquisition Regulations System DEFENSE ACQUISITION... Contract Pricing 215.404-1 Proposal analysis techniques. (1) Follow the procedures at PGI 215.404-1 for...

  15. RF merger and acquisition market

    Directory of Open Access Journals (Sweden)

    Evgeniya V. Vidishcheva

    2011-04-01

    Full Text Available The article gives brief characteristic of merger and acquisition market situation in Russia, brings in overview of bargains in 2009–2010. Russian merger and acquisition market is in early stage of development.

  16. RF merger and acquisition market

    OpenAIRE

    Evgeniya V. Vidishcheva; Merab S. Sichinava; Marina V. Kogan

    2011-01-01

    The article gives brief characteristic of merger and acquisition market situation in Russia, brings in overview of bargains in 2009–2010. Russian merger and acquisition market is in early stage of development.

  17. UC Merced NMR Instrumentation Acquisition

    Science.gov (United States)

    2015-06-18

    UC Merced NMR Instrumentation Acquisition For the UC Merced NMR Instrumentation Acquisition proposal, a new 400 MHz and an upgraded 500 MHz NMR ...UC Merced NMR Instrumentation Acquisition Report Title For the UC Merced NMR Instrumentation Acquisition proposal, a new 400 MHz and an upgraded 500...MHz NMR have been delivered, installed, and incorporated into research and two lab courses. While no results from these instruments have been

  18. Locative Terms and Warlpiri Acquisition.

    Science.gov (United States)

    Bavin, Edith L.

    1990-01-01

    Focuses on the influence of language specific properties in the acquisition of locative expressions. Some of the claims from literature on the acquisition of locative expressions are discussed and data from the acquisition of Warlpiri are presented and discussed in terms of these claims. (Author/CB)

  19. First Language Acquisition and Teaching

    Science.gov (United States)

    Cruz-Ferreira, Madalena

    2011-01-01

    "First language acquisition" commonly means the acquisition of a single language in childhood, regardless of the number of languages in a child's natural environment. Language acquisition is variously viewed as predetermined, wondrous, a source of concern, and as developing through formal processes. "First language teaching" concerns schooling in…

  20. First Language Acquisition and Teaching

    Science.gov (United States)

    Cruz-Ferreira, Madalena

    2011-01-01

    "First language acquisition" commonly means the acquisition of a single language in childhood, regardless of the number of languages in a child's natural environment. Language acquisition is variously viewed as predetermined, wondrous, a source of concern, and as developing through formal processes. "First language teaching" concerns schooling in…

  1. Is markerless acquisition of speech production accurate ?

    OpenAIRE

    Ouni, Slim; Dahmani, Sara

    2016-01-01

    International audience; In this study, the precision of markerless acquisition techniques have been assessed when used to acquire articulatory data for speech production studies. Two different markerless systems have been evaluated and compared to a marker-based one. The main finding is that both markerless systems provide reasonable result during normal speech and the quality is uneven during fast articulated speech. The quality of the data is dependent on the temporal resolution of the mark...

  2. Unsupervised Language Acquisition

    CERN Document Server

    De Marcken, C

    1996-01-01

    This thesis presents a computational theory of unsupervised language acquisition, precisely defining procedures for learning language from ordinary spoken or written utterances, with no explicit help from a teacher. The theory is based heavily on concepts borrowed from machine learning and statistical estimation. In particular, learning takes place by fitting a stochastic, generative model of language to the evidence. Much of the thesis is devoted to explaining conditions that must hold for this general learning strategy to arrive at linguistically desirable grammars. The thesis introduces a variety of technical innovations, among them a common representation for evidence and grammars, and a learning strategy that separates the ``content'' of linguistic parameters from their representation. Algorithms based on it suffer from few of the search problems that have plagued other computational approaches to language acquisition. The theory has been tested on problems of learning vocabularies and grammars from unse...

  3. Data acquisition instruments: Psychopharmacology

    Energy Technology Data Exchange (ETDEWEB)

    Hartley, D.S. III

    1998-01-01

    This report contains the results of a Direct Assistance Project performed by Lockheed Martin Energy Systems, Inc., for Dr. K. O. Jobson. The purpose of the project was to perform preliminary analysis of the data acquisition instruments used in the field of psychiatry, with the goal of identifying commonalities of data and strategies for handling and using the data in the most advantageous fashion. Data acquisition instruments from 12 sources were provided by Dr. Jobson. Several commonalities were identified and a potentially useful data strategy is reported here. Analysis of the information collected for utility in performing diagnoses is recommended. In addition, further work is recommended to refine the commonalities into a directly useful computer systems structure.

  4. Stock market driven acquisitions

    OpenAIRE

    Shleifer, Andrei; Vishny, Robert W.

    2003-01-01

    We present a model of mergers and acquisitions based on stock market misvaluations of the combining firms. The key ingredients of the model are the relative valuations of the merging firms and the market’s perception of the synergies from the combination. The model explains who acquires whom, the choice of the medium of payment, the valuation consequences of mergers, and merger waves. The model is consistent with available empirical findings about characteristics and returns of merging firms,...

  5. Stock Market Driven Acquisitions

    OpenAIRE

    Andrei Shleifer; Vishny, Robert W.

    2001-01-01

    We present a model of mergers and acquisitions based on stock market misvaluations of the combining firms. The key ingredients of the model are the relative valuations of the merging firms, the horizons of their respective managers, and the market's perception of the synergies from the combination. The model explains who acquirers whom, whether the medium of payment is cash or stock, what are the valuation consequences of mergers, and why there are merger waves. The model is consistent with a...

  6. Defense ADP Acquisition Study.

    Science.gov (United States)

    1981-11-30

    Government Operations Committee HOI - Headquarters Operating Tnstructions vii HOL - Higher Order Language HQ - Headquarters HW - Hardware I IFB...generates lengthy acquisition times, but rather, the basis for the delays is related to the Air Force acqusition process. -5- (2) The Current Air...information resources is stressed, the Senate language in the bill, and the specific wording in the law, dis- claim an expansion of GSA’s authority, as defined

  7. Second language acquisition

    OpenAIRE

    Indefrey, P; Davidson, D.

    2014-01-01

    This article reviews neurocognitive evidence on second language (L2) processing at speech sound, word, and sentence levels. Hemodynamic (functional magnetic resonance imaging and positron emission tomography) data suggest that L2s are implemented in the same brain structures as the native language but with quantitative differences in the strength of activation that are modulated by age of L2 acquisition and L2 proficiency. Electrophysiological data show a more complex pattern of first and L2 ...

  8. Second language acquisition

    OpenAIRE

    Indefrey, P.; Davidson, D.

    2014-01-01

    This article reviews neurocognitive evidence on second language (L2) processing at speech sound, word, and sentence levels. Hemodynamic (functional magnetic resonance imaging and positron emission tomography) data suggest that L2s are implemented in the same brain structures as the native language but with quantitative differences in the strength of activation that are modulated by age of L2 acquisition and L2 proficiency. Electrophysiological data show a more complex pattern of first and L2 ...

  9. Assessment of language acquisition.

    Science.gov (United States)

    de Villiers, Peter A; de Villiers, Jill G

    2010-03-01

    This review addresses questions of what should be assessed in language acquisition, and how to do it. The design of a language assessment is crucially connected to its purpose, whether for diagnosis, development of an intervention plan, or for research. Precise profiles of language strengths and weaknesses are required for clear definitions of the phenotypes of particular language and neurodevelopmental disorders. The benefits and costs of formal tests versus language sampling assessments are reviewed. Content validity, theoretically and empirically grounded in child language acquisition, is claimed to be centrally important for appropriate assessment. Without this grounding, links between phenomena can be missed, and interpretations of underlying difficulties can be compromised. Sensitivity and specificity of assessment instruments are often assessed using a gold standard of existing tests and diagnostic practices, but problems arise if that standard is biased against particular groups or dialects. The paper addresses the issues raised by the goal of unbiased assessment of children from diverse linguistic and cultural backgrounds, especially speakers of non-mainstream dialects or bilingual children. A variety of new approaches are discussed for language assessment, including dynamic assessment, experimental tools such as intermodal preferential looking, and training studies that assess generalization. Stress is placed on the need for measures of the process of acquisition rather than just levels of achievement. Copyright © 2010 John Wiley & Sons, Ltd. For further resources related to this article, please visit the WIREs website. Copyright © 2010 John Wiley & Sons, Ltd.

  10. Second language acquisition.

    Science.gov (United States)

    Juffs, Alan

    2011-05-01

    Second language acquisition (SLA) is a field that investigates child and adult SLA from a variety of theoretical perspectives. This article provides a survey of some key areas of concern including formal generative theory and emergentist theory in the areas of morpho-syntax and phonology. The review details the theoretical stance of the two different approaches to the nature of language: generative linguistics and general cognitive approaches. Some results of key acquisition studies from the two theoretical frameworks are discussed. From a generative perspective, constraints on wh-movement, feature geometry and syllable structure, and morphological development are highlighted. From a general cognitive point of view, the emergence of tense and aspect marking from a prototype account of inherent lexical aspect is reviewed. Reference is made to general cognitive learning theories and to sociocultural theory. The article also reviews individual differences research, specifically debate on the critical period in adult language acquisition, motivation, and memory. Finally, the article discusses the relationship between SLA research and second language pedagogy. Suggestions for further reading from recent handbooks on SLA are provided. WIREs Cogni Sci 2011 2 277-286 DOI: 10.1002/wcs.106 For further resources related to this article, please visit the WIREs website. Copyright © 2010 John Wiley & Sons, Ltd.

  11. Complexity in language acquisition.

    Science.gov (United States)

    Clark, Alexander; Lappin, Shalom

    2013-01-01

    Learning theory has frequently been applied to language acquisition, but discussion has largely focused on information theoretic problems-in particular on the absence of direct negative evidence. Such arguments typically neglect the probabilistic nature of cognition and learning in general. We argue first that these arguments, and analyses based on them, suffer from a major flaw: they systematically conflate the hypothesis class and the learnable concept class. As a result, they do not allow one to draw significant conclusions about the learner. Second, we claim that the real problem for language learning is the computational complexity of constructing a hypothesis from input data. Studying this problem allows for a more direct approach to the object of study--the language acquisition device-rather than the learnable class of languages, which is epiphenomenal and possibly hard to characterize. The learnability results informed by complexity studies are much more insightful. They strongly suggest that target grammars need to be objective, in the sense that the primitive elements of these grammars are based on objectively definable properties of the language itself. These considerations support the view that language acquisition proceeds primarily through data-driven learning of some form.

  12. Multispectral Acquisition of Large-Sized Pictorial Surfaces

    Directory of Open Access Journals (Sweden)

    Paviotti Anna

    2009-01-01

    Full Text Available Multispectral acquisition of artworks has recently received considerable attention in the image processing community. Quite understandably, so far this attention has mainly focused on paintings, given their predominant role in museum collections. It is worth pointing out that the instrumentation and procedures used for acquiring regular paintings are not suited for the multispectral acquisition of large-sized painted surfaces such as frescoed halls and great paintings. Given the relevance of such artifacts, and their widespread presence in churches or historical buildings due to their social function, the problem of finding suitable techniques for their acquisition is certainly worth addressing. This paper focuses on multispectral acquisition of large-sized pictorial surfaces, systematically addressing the practical issues related to the acquisition equipment and procedure. Given the crucial role played by the illumination in this application, special attention is given to this issue. The proposed approach is supported by experimental results.

  13. War-gaming application for future space systems acquisition: MATLAB implementation of war-gaming acquisition models and simulation results

    Science.gov (United States)

    Vienhage, Paul; Barcomb, Heather; Marshall, Karel; Black, William A.; Coons, Amanda; Tran, Hien T.; Nguyen, Tien M.; Guillen, Andy T.; Yoh, James; Kizer, Justin; Rogers, Blake A.

    2017-05-01

    The paper describes the MATLAB (MathWorks) programs that were developed during the REU workshop1 to implement The Aerospace Corporation developed Unified Game-based Acquisition Framework and Advanced Game - based Mathematical Framework (UGAF-AGMF) and its associated War-Gaming Engine (WGE) models. Each game can be played from the perspectives of the Department of Defense Acquisition Authority (DAA) or of an individual contractor (KTR). The programs also implement Aerospace's optimum "Program and Technical Baseline (PTB) and associated acquisition" strategy that combines low Total Ownership Cost (TOC) with innovative designs while still meeting warfighter needs. The paper also describes the Bayesian Acquisition War-Gaming approach using Monte Carlo simulations, a numerical analysis technique to account for uncertainty in decision making, which simulate the PTB development and acquisition processes and will detail the procedure of the implementation and the interactions between the games.

  14. Krashen's Second-Language Acquisition Theory and the Teaching of Edited American English.

    Science.gov (United States)

    Tricomi, Elizabeth Taylor

    1986-01-01

    Summarizes Stephen Krashen's work on second language acquisition (involving the distinction between language acquisition and language learning). Discusses several techniques for teaching "Edited American English" in light of Krashen's theory, including error-based exercises and guided editing. Indicates which techniques help or impede…

  15. Trimble LaserAce 1000 Accuracy Evaluation for Indoor Data Acquisition

    DEFF Research Database (Denmark)

    Jamali, Ali; Antón Castro, Francesc/François; Boguslawski, Pawel;

    2014-01-01

    paths). Currently, for indoor surveying, EDM and Terrestrial Laser Scanner (TLS) are mostly used. In this paper, several techniques for indoor 3D building data acquisition have been investigated. A rapid technique for indoor building data acquisition, with a special focus put on a rangefinder (a mobile...

  16. The Effects of Acquisitions on Firm Value, Evidence from Turkey

    Directory of Open Access Journals (Sweden)

    Fatma Büşra GÜNAY BENDAŞ

    2015-01-01

    Full Text Available Acquisitions are assumed to create value for both the target and the acquiring firm. This paper analyzes the sources of value creation in acquisitions and examines the domestic acquisitions that took place in Turkey in 2013. By taking the overall market considerations into account, I measure the degree of value creation over different periods of time. I use the standard market value technique to calculate abnormal returns in stock prices of the acquiring firms and find that the increase in firm value is statistically significant in the long run but not in the short run.

  17. Mergers and acquisitions: new arrangements in health care. Part 1.

    Science.gov (United States)

    Grant, E A

    1988-02-01

    Mergers and acquisitions are assuming a more important role in the healthcare industry today. These transactions require various issues be considered, such as valuation, capital planning, and so forth. In this article, the first in a five-part series on mergers and acquisitions, the fundamental methods and techniques of valuation are discussed. Some of these valuation methods, including comparative market transactions and free cash flow, are explained and examples are used to help potential purchasers and sellers to determine an organization's true value. Other articles in this series will include legal issues, tax implications, purchase investigations, and capital planning for mergers and acquisitions.

  18. VOCABULARY TEACHING AND LEARNING STRATEGIES IN SECOND LANGUAGE ACQUISITION

    OpenAIRE

    Adriana Teodorescu

    2011-01-01

    This paper aims at presenting various strategies and techniques used in vocabulary teaching and learning while reassessing the importance and role of vocabulary knowledge in second language acquisition. Lexical knowledge has proven to be central to communicative competence and to the acquisition of a second language. Besides, vocabulary knowledge involves much more than knowledge of single words, but knowledge of how words work together to achieve a communicative function.

  19. VOCABULARY TEACHING AND LEARNING STRATEGIES IN SECOND LANGUAGE ACQUISITION

    Directory of Open Access Journals (Sweden)

    Adriana Teodorescu

    2011-11-01

    Full Text Available This paper aims at presenting various strategies and techniques used in vocabulary teaching and learning while reassessing the importance and role of vocabulary knowledge in second language acquisition. Lexical knowledge has proven to be central to communicative competence and to the acquisition of a second language. Besides, vocabulary knowledge involves much more than knowledge of single words, but knowledge of how words work together to achieve a communicative function.

  20. VOCABULARY TEACHING AND LEARNING STRATEGIES IN SECOND LANGUAGE ACQUISITION

    Directory of Open Access Journals (Sweden)

    Adriana Teodorescu

    2011-10-01

    Full Text Available This paper aims at presenting various strategies and techniques used in vocabulary teaching and learning while reassessing the importance and role of vocabulary knowledge in second language acquisition. Lexical knowledge has proven to be central to communicative competence and to the acquisition of a second language. Besides, vocabulary knowledge involves much more than knowledge of single words, but knowledge of how words work together to achieve a communicative function.

  1. Results in Relating Quality Attributes to Acquisition Strategies

    Science.gov (United States)

    2014-02-01

    Contributing Methods and Techniques to the Proposed Alignment Method 26 CMU/SEI-2013-TN-026 | iv CMU/SEI-2013-TN-026 | v List of Tables Table 1...tion strategy in harmony or to pull them apart. By so doing, we intend to provide a method for organizations and project managers to avoid patterns...to aligning and mutually constraining acquisition strategy and software architecture. 8. A method that reconciles acquisition quality attributes and

  2. Software Acquisition Patterns of Failure and How to Recognize Them

    Science.gov (United States)

    2013-04-01

    business goals (e.g., split an acquisition that is conceptually a single system into multiple acquisitions to avoid a “ big bang ”) are in direct...of the six programs under study. In one program, the fear of a “ big bang ” approach led to splitting the intended large system into two separate...Program at the SEI. Recent projects include developing practices for engineering in an SoS context; the Service Migration and Reuse Technique

  3. The NUSTAR data acquisition

    Energy Technology Data Exchange (ETDEWEB)

    Loeher, B.; Toernqvist, H.T. [TU Darmstadt (Germany); GSI (Germany); Agramunt, J. [IFIC, CSIC (Spain); Bendel, M.; Gernhaeuser, R.; Le Bleis, T.; Winkel, M. [TU Muenchen (Germany); Charpy, A.; Heinz, A.; Johansson, H.T. [Chalmers University of Technology (Sweden); Coleman-Smith, P.; Lazarus, I.H.; Pucknell, V.F.E. [STFC Daresbury (United Kingdom); Czermak, A. [IFJ (Poland); Kurz, N.; Nociforo, C.; Pietri, S.; Schaffner, H.; Simon, H. [GSI (Germany); Scheit, H. [TU Darmstadt (Germany); Taieb, J. [CEA (France)

    2015-07-01

    The diversity of upcoming experiments within the NUSTAR collaboration, including experiments in storage rings, reactions at relativistic energies and high-precision spectroscopy, is reflected in the diversity of the required detection systems. A challenging task is to incorporate the different needs of individual detectors within the unified NUSTAR Data AcQuisition (NDAQ). NDAQ takes up this challenge by providing a high degree of availability via continuously running systems, high flexibility via experiment-specific configuration files for data streams and trigger logic, distributed timestamps and trigger information on km distances, all built on the solid basis of the GSI Multi-Branch System. NDAQ ensures interoperability between individual NUSTAR detectors and allows merging of formerly separate data streams according to the needs of all experiments, increasing reliability in NUSTAR data acquisition. An overview of the NDAQ infrastructure and the current progress is presented. The NUSTAR (NUclear STructure, Astrophysics and Reactions) collaboration represents one of the four pillars motivating the construction of the international FAIR facility. The diversity of NUSTAR experiments, including experiments in storage rings, reactions at relativistic energies and high-precision spectroscopy, is reflected in the diversity of the required detection systems. A challenging task is to incorporate the different needs of individual detectors and components under the umbrella of the unified NUSTAR Data AQuisition (NDAQ) infrastructure. NDAQ takes up this challenge by providing a high degree of availability via continuously running systems, high flexibility via experiment-specific configuration files for data streams and trigger logic, and distributed time stamps and trigger information on km distances, all built on the solid basis of the GSI Multi-Branch System (MBS). NDAQ ensures interoperability between individual NUSTAR detectors and allows merging of formerly separate

  4. First language acquisition.

    Science.gov (United States)

    Goodluck, Helen

    2011-01-01

    This article reviews current approaches to first language acquisition, arguing in favor of the theory that attributes to the child an innate knowledge of universal grammar. Such knowledge can accommodate the systematic nature of children's non-adult linguistic behaviors. The relationships between performance devices (mechanisms for comprehension and production of speech), non-linguistic aspects of cognition, and child grammars are also discussed. WIREs Cogn Sci 2011 2 47-54 DOI: 10.1002/wcs.95 For further resources related to this article, please visit the WIREs website. Copyright © 2010 John Wiley & Sons, Ltd.

  5. Multimodal acquisition of articulatory data: Geometrical and temporal registration.

    Science.gov (United States)

    Aron, Michaël; Berger, Marie-Odile; Kerrien, Erwan; Wrobel-Dautcourt, Brigitte; Potard, Blaise; Laprie, Yves

    2016-02-01

    Acquisition of dynamic articulatory data is of major importance for studying speech production. It turns out that one technique alone often is not enough to get a correct coverage of the whole vocal tract at a sufficient sampling rate. Ultrasound (US) imaging has been proposed as a good acquisition technique for the tongue surface because it offers a good temporal sampling, does not alter speech production, is cheap, and is widely available. However, it cannot be used alone and this paper describes a multimodal acquisition system which uses electromagnetography sensors to locate the US probe. The paper particularly focuses on the calibration of the US modality which is the key point of the system. This approach enables US data to be merged with other data. The use of the system is illustrated via an experiment consisting of measuring the minimal tongue to palate distance in order to evaluate and design Magnetic Resonance Imaging protocols well suited for the acquisition of three-dimensional images of the vocal tract. Compared to manual registration of acquisition modalities which is often used in acquisition of articulatory data, the approach presented relies on automatic techniques well founded from geometrical and mathematical points of view.

  6. Preoperative evaluation of the cystic duct for laparoscopic cholecystectomy: comparison of navigator-gated prospective acquisition correction- and conventional respiratory-triggered techniques at free-breathing 3D MR cholangiopancreatography

    Energy Technology Data Exchange (ETDEWEB)

    Itatani, Ryo [Kumamoto Chuo Hospital, Department of Radiology, Kumamoto (Japan); Kumamoto University, Department of Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto (Japan); Namimoto, Tomohiro; Sakamoto, Fumi; Yamashita, Yasuyuki [Kumamoto University, Department of Diagnostic Radiology, Graduate School of Medical Sciences, Kumamoto (Japan); Kajihara, Hiroo; Yoshimura, Akira; Katahira, Kazuhiro [Kumamoto Chuo Hospital, Department of Radiology, Kumamoto (Japan); Nasu, Jiro [Kumamoto Chuo Hospital, Department of Digestive Surgery, Kumamoto (Japan); Matsushita, Ikuo [Kumamoto Chuo Hospital, Department of Gastroenterological Medicine, Kumamoto (Japan); Kidoh, Masafumi [Amakusa Medical Center, Department of Diagnostic Radiology, Amakusa, Kumamoto (Japan)

    2013-07-15

    To evaluate the quality of magnetic resonance cholangiopancreatography (MRCP) images obtained with a three-dimensional navigator-gated (NG) technique and compare findings with conventional respiratory-triggered (RT) images in pre-laparoscopic cholecystectomy patients. Turbo-spin-echo (TSE) RT-MRCP (average 242 s) and balanced turbo-field-echo (bTFE) NG-MRCP (average 263 s) were acquired at 1.5-T MRI for 49 pre-laparoscopic cholecystectomy patients. Two radiologists independently assessed image quality, visibility of anatomical structures, common bile duct (CBD) stones, and signal-to-noise ratios (SNRs). Interobserver agreement was also evaluated. The anatomical details of the cystic duct were clearly demonstrated in 33 (67.3 %, reader A) and 35 (71.4 %, reader B) patients on RT-MRCP, and in 45 (91.8 %) and 44 (89.7 %) patients on NG-MRCP. On NG-MRCP, visualisation of the cystic duct (3.22/3.12), its origin (3.57/3.55), and the gallbladder(3.61/3.59) was statistically better than on RT-MRCP (2.90/2.78, 3.29/3.12, 2.98/2.88, respectively). The overall image quality was statistically better on NG-MRCP than RT-MRCP. Each technique identified the presence of CBD stones in all affected patients. The SNR was significantly higher on NG-MRCP (CHD 22.40, gallbladder 17.13) than RT-MRCP (CHD 17.05, gallbladder 9.30). Interobserver agreement was fair to perfect. Navigator-gated MRCP is more useful than respiratory-triggered MRCP for evaluating the gallbladder and cystic duct in patients scheduled for laparoscopic cholecystectomy. circle Magnetic resonance cholangiopancreatography (MRCP) provides important cystic duct information before laparoscopic cholecystectomy. (orig.)

  7. Unsupervised Language Acquisition

    Science.gov (United States)

    de Marcken, Carl

    1996-11-01

    This thesis presents a computational theory of unsupervised language acquisition, precisely defining procedures for learning language from ordinary spoken or written utterances, with no explicit help from a teacher. The theory is based heavily on concepts borrowed from machine learning and statistical estimation. In particular, learning takes place by fitting a stochastic, generative model of language to the evidence. Much of the thesis is devoted to explaining conditions that must hold for this general learning strategy to arrive at linguistically desirable grammars. The thesis introduces a variety of technical innovations, among them a common representation for evidence and grammars, and a learning strategy that separates the ``content'' of linguistic parameters from their representation. Algorithms based on it suffer from few of the search problems that have plagued other computational approaches to language acquisition. The theory has been tested on problems of learning vocabularies and grammars from unsegmented text and continuous speech, and mappings between sound and representations of meaning. It performs extremely well on various objective criteria, acquiring knowledge that causes it to assign almost exactly the same structure to utterances as humans do. This work has application to data compression, language modeling, speech recognition, machine translation, information retrieval, and other tasks that rely on either structural or stochastic descriptions of language.

  8. Data-acquisition systems

    Energy Technology Data Exchange (ETDEWEB)

    Cyborski, D.R.; Teh, K.M.

    1995-08-01

    Up to now, DAPHNE, the data-acquisition system developed for ATLAS, was used routinely for experiments at ATLAS and the Dynamitron. More recently, the Division implemented 2 MSU/DAPHNE systems. The MSU/DAPHNE system is a hybrid data-acquisition system which combines the front-end of the Michigan State University (MSU) DA system with the traditional DAPHNE back-end. The MSU front-end is based on commercially available modules. This alleviates the problems encountered with the DAPHNE front-end which is based on custom designed electronics. The first MSU system was obtained for the APEX experiment and was used there successfully. A second MSU front-end, purchased as a backup for the APEX experiment, was installed as a fully-independent second MSU/DAPHNE system with the procurement of a DEC 3000 Alpha host computer, and was used successfully for data-taking in an experiment at ATLAS. Additional hardware for a third system was bought and will be installed. With the availability of 2 MSU/DAPHNE systems in addition to the existing APEX setup, it is planned that the existing DAPHNE front-end will be decommissioned.

  9. Collection assessment and acquisitions budgets

    CERN Document Server

    Lee, Sul H

    2013-01-01

    This invaluable new book contains timely information about the assessment of academic library collections and the relationship of collection assessment to acquisition budgets. The rising cost of information significantly influences academic libraries'abilities to acquire the necessary materials for students and faculty, and public libraries'abilities to acquire material for their clientele. Collection Assessment and Acquisitions Budgets examines different aspects of the relationship between the assessment of academic library collections and the management of library acquisition budgets. Librar

  10. Comparison of voice acquisition methodologies in speech research.

    Science.gov (United States)

    Vogel, Adam P; Maruff, Paul

    2008-11-01

    The use of voice acoustic techniques has the potential to extend beyond work devoted purely to speech or vocal pathology. For this to occur, however, researchers and clinicians will require acquisition technologies that provide fast, accurate, and cost-effective methods for recording data. Therefore, the present study aimed to compare industry-standard techniques for acquiring high-quality acoustic signals (e.g., hard drive and solid-state recorder) with widely available and easy-to-use, computer-based (standard laptop) data-acquisition methods. Speech samples were simultaneously acquired from 15 healthy controls using all three methods and were analyzed using identical analysis techniques. Data from all three acquisition methods were directly compared using a variety of acoustic correlates. The results suggested that selected acoustic measures (e.g., f 0, noise-to-harmonic ratio, number of pauses) were accurately obtained using all three methods; however, minimum recording standards were required for widely used measures of perturbation.

  11. Advancements on Radar Polarization Information Acquisition and Processing

    Directory of Open Access Journals (Sweden)

    Dai Dahai

    2016-04-01

    Full Text Available The study on radar polarization information acquisition and processing has currently been one important part of radar techniques. The development of the polarization theory is simply reviewed firstly. Subsequently, some key techniques which include polarization measurement, polarization anti-jamming, polarization recognition, imaging and parameters inversion using radar polarimetry are emphatically analyzed in this paper. The basic theories, the present states and the development trends of these key techniques are presented and some meaningful conclusions are derived.

  12. Theories of language acquisition.

    Science.gov (United States)

    Vetter, H J; Howell, R W

    1971-03-01

    Prior to the advent of generative grammar, theoretical approaches to language development relied heavily upon the concepts ofdifferential reinforcement andimitation. Current studies of linguistic acquisition are largely dominated by the hypothesis that the child constructs his language on the basis of a primitive grammar which gradually evolves into a more complex grammar. This approach presupposes that the investigator does not impose his own grammatical rules on the utterances of the child; that the sound system of the child and the rules he employs to form sentences are to be described in their own terms, independently of the model provided by the adult linguistic community; and that there is a series of steps or stages through which the child passes on his way toward mastery of the adult grammar in his linguistic environment. This paper attempts to trace the development of human vocalization through prelinguistic stages to the development of what can be clearly recognized as language behavior, and then progresses to transitional phases in which the language of the child begins to approximate that of the adult model. In the view of the authors, the most challenging problems which confront theories of linguistic acquisition arise in seeking to account for structure of sound sequences, in the rules that enable the speaker to go from meaning to sound and which enable the listener to go from sound to meaning. The principal area of concern for the investigator, according to the authors, is the discovery of those rules at various stages of the learning process. The paper concludes with a return to the question of what constitutes an adequate theory of language ontogenesis. It is suggested that such a theory will have to be keyed to theories of cognitive development and will have to include and go beyond a theory which accounts for adult language competence and performance, since these represent only the terminal stage of linguistic ontogenesis.

  13. First and Second Language Acquisition

    Institute of Scientific and Technical Information of China (English)

    任海燕

    2007-01-01

    Though there are similarities between child first language acquisition and adult second language acquisition,this paper explores the differences between these two processes from several aspects and gives the suggestions that how we language teachers teach L2 students well in language teaching.

  14. Markedness and Second Language Acquisition.

    Science.gov (United States)

    Gil-Byeon, Ja

    1999-01-01

    Discusses whether markedness is at work in second-language acquisition in the same way it is in first-language acquisition when Korean speakers learn English as a second language and English speakers learn Korean as a second language. Results are discussed in terms of no access to universal grammar, partial access to universal grammar, and access…

  15. Universals of Second Language Acquisition.

    Science.gov (United States)

    Eckman, Fred R., Ed.; And Others

    Works on second language acquisition theories, affective variables and communicative competence, and interlanguage were compiled as a result of a symposium on universals of second language acquisition at the University of Wisconsin, Milwaukee. The papers include: "On the Variability of Interlangauge Systems" (Elaine Tarone); "Memory, Learning, and…

  16. Investment and Second Language Acquisition

    Science.gov (United States)

    Pittaway, Daniel S.

    2004-01-01

    The article argues that Norton Peirce's (1995) concept of a language learner's investment should figure centrally in how instructors address the needs of adult learners in ESL classrooms. Investment is discussed in relation to second language acquisition research that addresses the role of social factors in second language acquisition. The article…

  17. Language Acquisition, Pidgins and Creoles.

    Science.gov (United States)

    Wode, Henning

    1981-01-01

    Suggests that structural universals between different-based pidgins result from universal linguo-cognitive processing strategies which are employed in learning languages. Some of the strategies occur in all types of acquisition, and others are more applicable to L2 type acquisition. Past research is discussed, and some exemplary data are given.…

  18. 48 CFR 873.105 - Acquisition planning.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 5 2010-10-01 2010-10-01 false Acquisition planning. 873.105 Section 873.105 Federal Acquisition Regulations System DEPARTMENT OF VETERANS AFFAIRS DEPARTMENT... planning. (a) Acquisition planning is an indispensable component of the total acquisition process. (b) For...

  19. 32 CFR 644.88 - Other acquisition.

    Science.gov (United States)

    2010-07-01

    ... 32 National Defense 4 2010-07-01 2010-07-01 true Other acquisition. 644.88 Section 644.88 National... HANDBOOK Acquisition Acquisition by Purchase, Donation, and Transfer § 644.88 Other acquisition. (a) Acquisition from other Federal departments and agencies—(1) Transfers. Transfers will be obtained from...

  20. 23 CFR 710.501 - Early acquisition.

    Science.gov (United States)

    2010-04-01

    ... 23 Highways 1 2010-04-01 2010-04-01 false Early acquisition. 710.501 Section 710.501 Highways... REAL ESTATE Property Acquisition Alternatives § 710.501 Early acquisition. (a) Real property acquisition. The State may initiate acquisition of real property at any time it has the legal authority to...

  1. 48 CFR 234.004 - Acquisition strategy.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Acquisition strategy. 234..., DEPARTMENT OF DEFENSE SPECIAL CATEGORIES OF CONTRACTING MAJOR SYSTEM ACQUISITION 234.004 Acquisition strategy. (1) See 209.570 for policy applicable to acquisition strategies that consider the use of lead...

  2. 48 CFR 34.004 - Acquisition strategy.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 1 2010-10-01 2010-10-01 false Acquisition strategy. 34... CATEGORIES OF CONTRACTING MAJOR SYSTEM ACQUISITION General 34.004 Acquisition strategy. The program manager, as specified in agency procedures, shall develop an acquisition strategy tailored to the...

  3. 48 CFR 3034.004 - Acquisition strategy.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 7 2010-10-01 2010-10-01 false Acquisition strategy. 3034.004 Section 3034.004 Federal Acquisition Regulations System DEPARTMENT OF HOMELAND SECURITY, HOMELAND... Acquisition strategy. See (HSAR) 48 CFR 3009.570 for policy applicable to acquisition strategies that...

  4. DATA ACQUISITION (DAQ)

    CERN Multimedia

    Gerry Bauer

    The CMS Storage Manager System The tail-end of the CMS Data Acquisition System is the Storage Manger (SM), which collects output from the HLT and stages the data at Cessy for transfer to its ultimate home in the Tier-0 center. A SM system has been used by CMS for several years with the steadily evolving software within the XDAQ framework, but until relatively recently, only with provisional hardware. The SM is well known to much of the collaboration through the ‘MiniDAQ’ system, which served as the central DAQ system in 2007, and lives on in 2008 for dedicated sub-detector commissioning. Since March of 2008 a first phase of the final hardware was commissioned and used in CMS Global Runs. The system originally planned for 2008 aimed at recording ~1MB events at a few hundred Hz. The building blocks to achieve this are based on Nexsan's SATABeast storage array - a device  housing up to 40 disks of 1TB each, and possessing two controllers each capable of almost 200 MB/sec throughput....

  5. Factors affecting the Long-Term Post-Acquisition Performance of BRICS Firms Engaging in Cross-Border Mergers and Acquisitions

    Directory of Open Access Journals (Sweden)

    Damilola Oyetade

    2017-04-01

    Full Text Available The purpose of the paper is to examine factors that affect the long-term performance of listed firms from Brazil, Russia, India, China and South Africa (BRICS that engage in cross-border mergers and acquisitions. This paper adds to the existing literature on the performance of mergers and acquisitions from emerging economies by examining the performance of mergers and acquisitions activities on acquirers from individual BRICS countries and examining whether intra-BRICS acquisitions are more beneficial than non-BRICS acquisitions. The system generalised method of moments estimation technique was employed in order to control for unobservable heterogeneity and potential endogeneity problems using accounting data and merger deal information collected from the Bloomberg online database for the period January 2000 to December 2012.The results obtained indicate that there is persistence in the profits, suggesting that BRICS acquirers continue to profit as they engage in mergers and acquisitions, and firm size significantly impacts the profits of acquirers.

  6. SALT for Language Acquisition.

    Science.gov (United States)

    Bancroft, W. Jane

    1996-01-01

    Discusses Schuster's Suggestive-Accelerative Learning Techniques (SALT) Method, which combines Lozanov's Suggestopedia with such American methods as Asher's Total Physical Response and Galyean's Confluent Education. The article argues that students trained with the SALT Method have higher achievement scores and better attitudes than others. (14…

  7. SALT for Language Acquisition.

    Science.gov (United States)

    Bancroft, W. Jane

    1996-01-01

    Discusses Schuster's Suggestive-Accelerative Learning Techniques (SALT) Method, which combines Lozanov's Suggestopedia with such American methods as Asher's Total Physical Response and Galyean's Confluent Education. The article argues that students trained with the SALT Method have higher achievement scores and better attitudes than others. (14…

  8. Foreign Acquisition, Wages and Productivity

    DEFF Research Database (Denmark)

    Bandick, Roger

    This paper studies the effect of foreign acquisition on wages and total factor productivity (TFP) in the years following a takeover by using unique detailed firm-level data for Sweden for the period 1993-2002. The paper takes particular account of the potential endogeneity of the acquisition...... no effects on overall, skilled or less-skilled wage growth neither in targeted Swedish MNEs nor in targeted Swedish non-MNEs and neither if the acquisition was motivated by vertical or horizontal motives. However, the results indicate that both targeted Swedish MNEs and non-MNEs have better growth in TFP...

  9. Foreign Acquisition, Wages and Productivity

    DEFF Research Database (Denmark)

    Bandick, Roger

    2011-01-01

    This paper studies the effect of foreign acquisition on wages and total factor productivity (TFP) in the years following a takeover by using unique detailed firm-level data for Sweden for the period 1993-2002. The paper takes particular account of the potential endogeneity of the acquisition...... no effects on overall, skilled or less-skilled wage growth neither in targeted Swedish MNEs nor in targeted Swedish non-MNEs and neither if the acquisition was motivated by vertical or horizontal motives. However, the results indicate that both targeted Swedish MNEs and non-MNEs have better growth in TFP...

  10. Memory Forensics: Review of Acquisition and Analysis Techniques

    Science.gov (United States)

    2013-11-01

    Privacy. PTE Page Table Entry. PTI Page Table Index. RAM Random Access Memory. RPC Remote Procedure Call. SAN Storage Area Network. SATA Serial Advanced...speed improvements have been made through technologies such as Solid State Drives (SSDs), Serial Advanced Technology Attachment ( SATA ) Express

  11. Decision Making in the Acquisition Community: Survey and Techniques

    Science.gov (United States)

    1992-04-01

    comment on decisional weaknesses noted in supporting offices outside their direct responsibility. Question six marks a major change in the direction of...functions outside the program office that, according to the respondents experience, was decisionally deficient. In the cases where this blank was filled...R A(’NmoNTIi., wt1( 70 PM TBEAU-SD A 11.111SILI.II, Al..38 41.90 394 PM AU TOMA ID FL ) ET Al AI. LOG I SV r r’UDDN 1:[.)1n1P-500 FCORT LI1FF., VA

  12. Techniques for Developing an Acquisition Strategy by Profiling Software Risks

    Science.gov (United States)

    2006-08-01

    we want to thank our Carnegie Mellon® Software Engineering Institute (SEI) colleagues for their foundational research: Cecilia Albert, John Bergey ...data be migrated manually or will it be automated? How will the integrity of the data and the system operations be verified? Is the support...perform his or her task. This kind of training, the equivalent of reading the installation manual , user’s manual , or service manual for the product

  13. Environmental Life Cycle Techniques for New Weapons Acquisition Systems

    Science.gov (United States)

    2004-09-01

    2003). Ullmann’s Encyclopedia of Industrial Chemistry , Volume 5th ed.: John Wiley & Sons. Urbanski, T. (1984). Chemistry and technology of...September 2004 E1420 Sub area code 35 Environmental Studies Sub area code 2 Defence Analysis SE-172 90 Stockholm Author/ s (editor/ s ) Project...Övriga bibliografiska uppgifter Språk Engelska ISSN 1650-1942 Antal sidor: 60 s . Distribution enligt missiv Pris: Enligt prislista FO I1 00 4

  14. Skill acquisition of manual wheelchair propulsion: initial motor learning

    Directory of Open Access Journals (Sweden)

    HEJ VEEGER Dirkjan

    2011-12-01

    Full Text Available Changes in propulsion technique due to motor learning might account for a higher mechanical efficiency (ME, the ratio of internal power over external power. The changes in ME and propulsion technique were studied in a learning experiment, three times a week for eight minutes, with nine able-bodied subjects, simulating early rehabilitation. Instrumented wheels measured three-dimensional forces and torques on the handrim. During practice peak torques were reduced, work per cycle increased, while push frequency decreased, at a stable power output and speed of the treadmill. Over the three weeks of practice propulsion technique kept changing in combination with an increase of ME. Results suggest skill acquisition because of motor learning. The rise in ME seems logically related to propulsion technique, but is not yet fully understood. More insight in motor learning and skill acquisition will contribute to understanding and optimizing rehabilitation strategies in the light of wheelchair provision in early rehabilitation.

  15. Computed tomography: acquisition process, technology and current state

    Directory of Open Access Journals (Sweden)

    Óscar Javier Espitia Mendoza

    2016-02-01

    Full Text Available Computed tomography is a noninvasive scan technique widely applied in areas such as medicine, industry, and geology. This technique allows the three-dimensional reconstruction of the internal structure of an object which is lighted with an X-rays source. The reconstruction is formed with two-dimensional cross-sectional images of the object. Each cross-sectional is obtained from measurements of physical phenomena, such as attenuation, dispersion, and diffraction of X-rays, as result of their interaction with the object. In general, measurements acquisition is performed with methods based on any of these phenomena and according to various architectures classified in generations. Furthermore, in response to the need to simulate acquisition systems for CT, software dedicated to this task has been developed. The objective of this research is to determine the current state of CT techniques, for this, a review of methods, different architectures used for the acquisition and some of its applications is presented. Additionally, results of simulations are presented. The main contributions of this work are the detailed description of acquisition methods and the presentation of the possible trends of the technique.

  16. 3-D acquisition geometry analysis: Incorporating information from multiples

    NARCIS (Netherlands)

    Kumar, A.; Blacquiere, G.; Verschuur, D.J.

    2014-01-01

    Recent advances in survey design have led to conventional common-midpoint-based analysis being replaced by the subsurface-based seismic acquisition analysis and design, with the emphasis on advance techniques of illumination analysis. Amongst them are wave-equation-based seismic illumination analyse

  17. Agile Methods: Selected DoD Management and Acquisition Concerns

    Science.gov (United States)

    2011-10-01

    20, 40 or 100 (an adaptation of a Fibonacci series). Other Agile estimation techniques use similar scales. The spacing between the point values is...acquisition life cycle regulations that provides explicit guidance on contents and sequencing of technical milestones in a program using Agile would

  18. Individual Differences in Syntactic Priming in Language Acquisition

    Science.gov (United States)

    Kidd, Evan

    2012-01-01

    Although the syntactic priming methodology is a promising tool for language acquisition researchers, using the technique with children raises issues that are not problematic in adult research. The current paper reports on an individual differences study that addressed some of these outstanding issues. (a) Does priming purely reflect syntactic…

  19. Platform attitude data acquisition system

    Digital Repository Service at National Institute of Oceanography (India)

    Afzulpurkar, S.

    A system for automatic acquisition of underwater platform attitude data has been designed, developed and tested in the laboratory. This is a micro controller based system interfacing dual axis inclinometer, high-resolution digital compass...

  20. Portable Data Acquisition System Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Armstrong researchers have developed a portable data acquisition system (PDAT) that can be easily transported and set up at remote locations to display and archive...

  1. Schizophrenia and second language acquisition.

    Science.gov (United States)

    Bersudsky, Yuly; Fine, Jonathan; Gorjaltsan, Igor; Chen, Osnat; Walters, Joel

    2005-05-01

    Language acquisition involves brain processes that can be affected by lesions or dysfunctions in several brain systems and second language acquisition may depend on different brain substrates than first language acquisition in childhood. A total of 16 Russian immigrants to Israel, 8 diagnosed schizophrenics and 8 healthy immigrants, were compared. The primary data for this study were collected via sociolinguistic interviews. The two groups use language and learn language in very much the same way. Only exophoric reference and blocking revealed meaningful differences between the schizophrenics and healthy counterparts. This does not mean of course that schizophrenia does not induce language abnormalities. Our study focuses on those aspects of language that are typically difficult to acquire in second language acquisition. Despite the cognitive compromises in schizophrenia and the manifest atypicalities in language of speakers with schizophrenia, the process of acquiring a second language seems relatively unaffected by schizophrenia.

  2. An Analysis on the Importance of Motivation and Strategy in Postgraduates English Acquisition

    Science.gov (United States)

    Feng, Ruizhen; Chen, Hong

    2009-01-01

    Postgraduates' English acquisition is an intriguing but complex process. A lot of factors have contributed to the outcome of a learner's acquisition, among them, motivation and strategy are playing a crucial role. Motivation is the driving force to encourage the learner to learn, while strategy being the techniques or devices for a learner to use…

  3. English Acquisition in Classroom Teaching

    Institute of Scientific and Technical Information of China (English)

    周自强

    2013-01-01

    In the course of learning English in classroom, students cultivate their ability to use the language. But that ability does not mean they are able to acquire that language in a communicative way, because the acquisition of language in classroom is mainly for the purpose of learning. It starts and ends in a particular circumstance-the classroom. In that case, analyzed and dis-cussed is the universal feature of English acquisition in classroom and its effects on practical use respectively.

  4. Ecological Theory of Language Acquisition

    OpenAIRE

    Lacerda, Francisco; Klintfors, Eeva; Gustavsson, Lisa; Lagerkvist, Lisa; MARKLUND, ELLEN; Sundberg, Ulla

    2004-01-01

    This poster outlines an Ecological Theory of Language Acquisition (ETLA). The theory views the early phases of the language acquisition process as an emergent consequence of the interaction between the infant and its linguistic environment. The newborn infant is considered to be linguistically and phonetically naïve but endowed with the ability to register a wide range of multi-sensory inputs along with the ability to detect similarity between the multi-sensory stimuli it is exposed to. The i...

  5. Language Acquisition and Language Learning

    Institute of Scientific and Technical Information of China (English)

    蔡红

    2007-01-01

    Language is at the center of human life. This essay tries to seek similarities and differences between language acquisition and language learning from the theory achievements of some linguists. On this basis, it is pointed out that language acquisition is the effect of sub consciousness, while language learning is connected with conscious system. Thereby this paper analyzes the interaction between them and the influence on the present situation of foreign language teaching in China.

  6. Language Acquisition and Language Learning

    Institute of Scientific and Technical Information of China (English)

    蔡红

    2007-01-01

    Language is at the center of human life.This essay tries to seek similarities and differences between language acquisition and language learning from the theory achievements of some linguists.On this basis,it is pointed out that language acquisition is the effect of sub consciousness,while language learning is connected with conscious system.Thereby this paper analyzes the interaction between them and the influence on the present situation of foreign language teaching in China.

  7. Improving Tradecraft of Services Acquisition

    Science.gov (United States)

    2015-08-01

    Logistics Management Services , Equipment Related Services , Electronics and Communication Services , Medical Services , and Facilities Related Defense AT&L...Acquisition University (DAU) Service Acquisition Process for standardization. This seven step, team-focused approach relies on market research...detailed in BBP 3.0. Training and Tools BBP 1.0 and 2.0 rightly noted that services are required and overseen by DoD personnel that often are not

  8. 48 CFR 815.404-1 - Proposal analysis techniques.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 5 2010-10-01 2010-10-01 false Proposal analysis techniques. 815.404-1 Section 815.404-1 Federal Acquisition Regulations System DEPARTMENT OF VETERANS AFFAIRS... techniques. (a) Contracting officers are responsible for the technical and administrative sufficiency of the...

  9. Simultaneous multislice (SMS) imaging techniques

    NARCIS (Netherlands)

    Barth, M.; Breuer, F.; Koopmans, P.J.; Norris, David Gordon; Poser, B.A.

    2016-01-01

    Simultaneous multislice imaging (SMS) using parallel image reconstruction has rapidly advanced to become a major imaging technique. The primary benefit is an acceleration in data acquisition that is equal to the number of simultaneously excited slices. Unlike in-plane parallel imaging this can have

  10. Sustaining an Acquisition-based Growth Strategy

    DEFF Research Database (Denmark)

    Henningsson, Stefan; Toppenberg, Gustav; Shanks, Graeme

    complementarity, c) directing and governing the integration process, and d) post-acquisition evaluation of the achieved integration and proposing ways forward. Using the EA capability in the acquisition process improves Cisco’s ability to rapidly capture value from its acquisitions and to sustain its acquisition......-based growth strategy over time....

  11. 14 CFR 151.73 - Land acquisition.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 3 2010-01-01 2010-01-01 false Land acquisition. 151.73 Section 151.73... FEDERAL AID TO AIRPORTS Project Programming Standards § 151.73 Land acquisition. (a) The acquisition of... forth typical eligible and ineligible items of land acquisition as covered by this section....

  12. 32 CFR 644.7 - Acquisition lines.

    Science.gov (United States)

    2010-07-01

    ... 32 National Defense 4 2010-07-01 2010-07-01 true Acquisition lines. 644.7 Section 644.7 National... HANDBOOK Project Planning Civil Works § 644.7 Acquisition lines. (a) Tentative acquisition lines. As indicated in § 644.6(c)(1)(iii)(K), tentative acquisition lines are shown on maps which are part of the...

  13. Acquisition in USTRANSCOM: An Organizational Assessment

    Science.gov (United States)

    2009-12-01

    CRAF Civil Reserve Air Fleet DAPA Defense Acquisition Performance Assessment DAR Defense Acquisition Regulation DAS Defense Acquisition...ENVIRONMENT The current Defense Acquisition Environment consists of a triad between Congress, the Executive Branch, and Industry. The DoD Program...Manager (PM) fits directly in the middle of this triad and is constantly receiving and delivering information to the entities mentioned above

  14. 48 CFR 7.402 - Acquisition methods.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 1 2010-10-01 2010-10-01 false Acquisition methods. 7.402... ACQUISITION PLANNING Equipment Lease or Purchase 7.402 Acquisition methods. (a) Purchase method. (1) Generally, the purchase method is appropriate if the equipment will be used beyond the point in time...

  15. Unmanned Maritime Systems Incremental Acquisition Approach

    Science.gov (United States)

    2016-12-01

    NAVAL POSTGRADUATE SCHOOL MONTEREY, CALIFORNIA MBA PROFESSIONAL REPORT UNMANNED MARITIME SYSTEMS INCREMENTAL ACQUISITION...REPORT TYPE AND DATES COVERED MBA professional report 4. TITLE AND SUBTITLE UNMANNED MARITIME SYSTEMS INCREMENTAL ACQUISITION APPROACH 5. FUNDING...explore and understand the issues involved in the DOD’s acquisition process for Unmanned Maritime Systems (UMS) in order to recommend a new acquisition

  16. High-Speed Real-Time Data Acquisition System Realized by Interleaving/Multiplexing Technique%应用并行多数据采集通道复用技术实现高速实时采样系统

    Institute of Scientific and Technical Information of China (English)

    吕洁; 莫毅群; 罗伟雄

    2000-01-01

    The interleaving/multiplexing technique was used to realize a 200MHz real-time data acquisition system. Two 100MHz ADC modules worked parallelly and every ADC plays out data in ping-pang fashion. The design improved the system conversion rata to 200MHz and reduced the speed of data transporting and storing to 50MHz. The high-speed HDPLD and ECL logic parts were used to control system timing and the memory address. The multi-layer print board and the shield were used to decrease interference produced by the high-speed circuit. The system timing was designed carefully. The interleaving/multiplexing technique could improve the system conversion rata greatly while reducing the speed of external digital interfaces greatly. The design resolved the difficulties in high-speed system effectively. The experiment proved the data acquisition system is stable and accurate.%为了实现200MHz实时采样系统,采用了并行多数据采集通道复用技术.两个100MHz数据采集通道并行工作,两个通道均采用乒乓存储,这样系统采样率达到200MHz而数据的存储和传输速率只需要50MHz.系统设计中对于并行处理的各个部分给予了精心的时序配合设计,并针对高速数据采集的要求采用了ECL门电路以及高速的可编程逻辑器件实现存储器地址计数器以及系统控制电路,而且为减小高速电路中的干扰采用了多层板的设计并对系统和输入信号进行了屏蔽处理.实验证明采样系统性能稳定,采样数据符合精度要求.并行多数据采集通道复用技术既有效地提高了系统的采样率又减轻了数据存储和传输的压力.系统设计围绕高速数据采集的要求,并行处理的各个部分时序配合准确,并针对高速电路系统中所遇到的电磁反射和干扰等问题提出了有效的解决办法.

  17. BlackBerry’s acquisition by Samsung : mergers & acquisitions

    OpenAIRE

    Carmelino, José Diogo Leal

    2015-01-01

    The main purpose of this dissertation is to study a recent market rumor about BlackBerry’s acquisition by the rival company Samsung and whether this deal would be good for both parties. The main goal is not only to understand if they will have a higher value together but also to understand how this Merger & Acquisition (M&A) deal would affect the entire industry. In a recent past, Samsung was discussing with Apple the leadership of the market. They had big judicial fights related with pate...

  18. Acquisition Pros Keep the Gears Moving

    Science.gov (United States)

    2015-06-01

    program folks and team members throughout the entire acquisition process. Acquisition Reform Part of acquisition reform includes resupplying the...Acquisition requires us to be critical thinkers (remem- ber to be inquisitive) and to be self-motivated professionals. All customers want to feel they are...involvement and open dialogue with the customer and other members of the acquisition team increase the chances for an execution success because the

  19. 77 FR 181 - Federal Acquisition Regulation; Federal Acquisition Circular 2005-55; Introduction

    Science.gov (United States)

    2012-01-03

    ... Space Administration 48 CFR Chapter 1 Federal Acquisition Regulation; Final Rules #0;#0;Federal Register... Acquisition Regulation; Federal Acquisition Circular 2005-55; Introduction AGENCIES: Department of Defense (Do... Acquisition Regulation (FAR) rules agreed to by DoD, GSA, and NASA in this Federal Acquisition Circular...

  20. ESKAPE/CF: A Knowledge Acquisition Tool for Expert Systems Using Cognitive Feedback

    Science.gov (United States)

    1991-03-01

    model can capture all levels or types of expertise (Olson & Rueter 1987), careful evaluation cf available knowledgle acquisition tools and techniques i... careful evaluation of available knowledge acquisition tools and techniques is required to match the tool with the particular application (Kitto & Boose...and accuracy of the models would be of paramount concern. The system should be contrasted with existing automated tools such as Kitten and Aquinas

  1. Concept Acquisition and Experiential Change

    Directory of Open Access Journals (Sweden)

    William S. Robinson

    2014-12-01

    Full Text Available Many have held the Acquisition of Concepts Thesis (ACT that concept acquisition can change perceptual experience. This paper explains the close relation of ACT to ADT, the thesis that acquisition of dispositions to quickly and reliably recognize a kind of thing can change perceptual experience. It then states a highly developed argument given by Siegel (2010 which, if successful, would offer strong support for ADT and indirect support for ACT. Examination of this argument, however, reveals difficulties that undermine its promise. Distinctions made in this examination help to clarify an alternative view that denies ADT and ACT while accepting that long exposure to a class of materials may induce changes in phenomenology that lie outside perceptual experience itself.

  2. Computational models of syntactic acquisition.

    Science.gov (United States)

    Yang, Charles

    2012-03-01

    The computational approach to syntactic acquisition can be fruitfully pursued by integrating results and perspectives from computer science, linguistics, and developmental psychology. In this article, we first review some key results in computational learning theory and their implications for language acquisition. We then turn to examine specific learning models, some of which exploit distributional information in the input while others rely on a constrained space of hypotheses, yet both approaches share a common set of characteristics to overcome the learning problem. We conclude with a discussion of how computational models connects with the empirical study of child grammar, making the case for computationally tractable, psychologically plausible and developmentally realistic models of acquisition. WIREs Cogn Sci 2012, 3:205-213. doi: 10.1002/wcs.1154 For further resources related to this article, please visit the WIREs website.

  3. Sodium magnetic resonance imaging. Development of a 3D radial acquisition technique with optimized k-space sampling density and high SNR-efficiency; Natrium-Magnetresonanztomographie. Entwicklung einer 3D radialen Messtechnik mit optimierter k-Raum-Abtastdichte und hoher SNR-Effizienz

    Energy Technology Data Exchange (ETDEWEB)

    Nagel, Armin Michael

    2009-04-01

    A 3D radial k-space acquisition technique with homogenous distribution of the sampling density (DA-3D-RAD) is presented. This technique enables short echo times (TE<0.5 ms), that are necessary for {sup 23}Na-MRI, and provides a high SNR-efficiency. The gradients of the DA-3D-RAD-sequence are designed such that the average sampling density in each spherical shell of k-space is constant. The DA-3D-RAD-sequence provides 34% more SNR than a conventional 3D radial sequence (3D-RAD) if T{sub 2}{sup *}-decay is neglected. This SNR-gain is enhanced if T{sub 2}{sup *}-decay is present, so a 1.5 to 1.8 fold higher SNR is measured in brain tissue with the DA-3D-RAD-sequence. Simulations and experimental measurements show that the DA-3D-RAD sequence yields a better resolution in the presence of T{sub 2}{sup *}-decay and less image artefacts when B{sub 0}-inhomogeneities exist. Using the developed sequence, T{sub 1}-, T{sub 2}{sup *}- and Inversion-Recovery-{sup 23}Na-image contrasts were acquired for several organs and {sup 23}Na-relaxation times were measured (brain tissue: T{sub 1}=29.0{+-}0.3 ms; T{sub 2s}{sup *}{approx}4 ms; T{sub 2l}{sup *}{approx}31 ms; cerebrospinal fluid: T{sub 1}=58.1{+-}0.6 ms; T{sub 2}{sup *}=55{+-}3 ms (B{sub 0}=3 T)). T{sub 1}- und T{sub 2}{sup *}-relaxation times of cerebrospinal fluid are independent of the selected magnetic field strength (B0 = 3T/7 T), whereas the relaxation times of brain tissue increase with field strength. Furthermore, {sup 23}Na-signals of oedemata were suppressed in patients and thus signals from different tissue compartments were selectively measured. (orig.)

  4. Disentangling value creation mechanism in cross-border acquisitions

    DEFF Research Database (Denmark)

    Wang, Daojuan; Sørensen, Olav Jull; Moini, Hamid

    2016-01-01

    important strategic dimensions for realizing synergy and creating value in CBAs . Furthermore, mediation analysis shows that the two acquisition-based dynamic capabilities—value identification and resource reconfiguration—act as important mediators in how the joining firms’ resource base impacts acquisition......This study investigates the value creation mechanism in cross-border acquisitions ( CBAs ) by employing a structural equation modeling technique and surveying 103 CBAs performed by Nordic firms. The results reveal that resource possession, resource picking, and resource utilization are three...... outcomes. The results shed light on the mechanisms through which the constructs influence value creation in CBAs and highlight the procedural and dynamic character of these determinants. The results also indicate that an integrative and process perspective, such as the “input-process-output” model proposed...

  5. Data acquisition electronics for positron emission mammography (PEM) detectors

    Energy Technology Data Exchange (ETDEWEB)

    Martinez, J.D. [Digital Systems Design Group, Universidad Politecnica de Valencia, Camino de Vera s/n, 46022 Valencia (Spain)]. E-mail: jormarp1@doctor.upv.es; Sebastia, A. [Digital Systems Design Group, Universidad Politecnica de Valencia, Camino de Vera s/n, 46022 Valencia (Spain); Cerda, J. [Digital Systems Design Group, Universidad Politecnica de Valencia, Camino de Vera s/n, 46022 Valencia (Spain); Esteve, R. [Digital Systems Design Group, Universidad Politecnica de Valencia, Camino de Vera s/n, 46022 Valencia (Spain); Mora, F.J. [Digital Systems Design Group, Universidad Politecnica de Valencia, Camino de Vera s/n, 46022 Valencia (Spain); Toledo, J.F. [Digital Systems Design Group, Universidad Politecnica de Valencia, Camino de Vera s/n, 46022 Valencia (Spain); Benlloch, J.M. [Nuclear Medical Physics Group, Instituto de Fisica Corpuscular (CSIC-UV), Poligono de la Coma s/n, 46980 Paterna, Valencia (Spain); Gimenez, N. [Nuclear Medical Physics Group, Instituto de Fisica Corpuscular (CSIC-UV), Poligono de la Coma s/n, 46980 Paterna, Valencia (Spain); Gimenez, M. [Nuclear Medical Physics Group, Instituto de Fisica Corpuscular (CSIC-UV), Poligono de la Coma s/n, 46980 Paterna, Valencia (Spain); Lerche, Ch. W. [Nuclear Medical Physics Group, Instituto de Fisica Corpuscular (CSIC-UV), Poligono de la Coma s/n, 46980 Paterna, Valencia (Spain); Pavon, N. [Nuclear Medical Physics Group, Instituto de Fisica Corpuscular (CSIC-UV), Poligono de la Coma s/n, 46980 Paterna, Valencia (Spain); Sanchez, F. [Nuclear Medical Physics Group, Instituto de Fisica Corpuscular (CSIC-UV), Poligono de la Coma s/n, 46980 Paterna, Valencia (Spain)

    2005-01-21

    Positron emission mammography (PEM) is an innovative technique to increase sensitivity and overcome the main drawbacks of conventional X-ray screening. However, dedicated PET imaging systems demand specific hardware solutions for data acquisition and processing that can take advantage of the reduction in the number of channels. Data acquisition issues can affect PEM scanners performance and they should be exhaustively addressed in order to exploit the increment in the event count rate. This is crucial in order to reduce both the scanning time and the total injected dose. This paper presents the electronics for our PEM camera prototype that enables us to achieve very high-count rates and perform comprehensive online processing. Results about acquisition in our detector for a typical clinical setup are studied using Monte Carlo simulation of hot lesion phantoms.

  6. Experimental techniques; Techniques experimentales

    Energy Technology Data Exchange (ETDEWEB)

    Roussel-Chomaz, P. [GANIL CNRS/IN2P3, CEA/DSM, 14 - Caen (France)

    2007-07-01

    This lecture presents the experimental techniques, developed in the last 10 or 15 years, in order to perform a new class of experiments with exotic nuclei, where the reactions induced by these nuclei allow to get information on their structure. A brief review of the secondary beams production methods will be given, with some examples of facilities in operation or under project. The important developments performed recently on cryogenic targets will be presented. The different detection systems will be reviewed, both the beam detectors before the targets, and the many kind of detectors necessary to detect all outgoing particles after the reaction: magnetic spectrometer for the heavy fragment, detection systems for the target recoil nucleus, {gamma} detectors. Finally, several typical examples of experiments will be detailed, in order to illustrate the use of each detector either alone, or in coincidence with others. (author)

  7. A review of spelling acquisition

    DEFF Research Database (Denmark)

    Dich, Nadya; Cohn, Abigail C.

    2013-01-01

    This review article discusses how empirical data on the acquisition of spelling by children inform the question of the psycholinguistic validity of the phoneme, a concept central (at least implicitly) to most phonological theories. The paper reviews data on children's early spelling attempts...... literacy factors into modeling phonological knowledge. In this article, we show that the spelling acquisition data support and are best accounted for by models allowing for a hierarchy of representations, that learning to read and write has a profound effect on the phonological knowledge of an adult...

  8. Motivation in Second Language Acquisition

    Institute of Scientific and Technical Information of China (English)

    GAO Ya

    2015-01-01

    Second language acquisition is a complex process which involves various factors. The factors can be put into two cate⁃gories:social factors and learner factors. Each category includes a number of factors. The factors such as motivation, age, learning strategies and others such as personality, aptitude are also mutually related. Among all of those factors, motivation plays a very im⁃portant role in the second language acquisition. In this essay, the author will discuss the key factors that affect the outcome of the process.

  9. A random matrix approach to language acquisition

    Science.gov (United States)

    Nicolaidis, A.; Kosmidis, Kosmas; Argyrakis, Panos

    2009-12-01

    Since language is tied to cognition, we expect the linguistic structures to reflect patterns that we encounter in nature and are analyzed by physics. Within this realm we investigate the process of lexicon acquisition, using analytical and tractable methods developed within physics. A lexicon is a mapping between sounds and referents of the perceived world. This mapping is represented by a matrix and the linguistic interaction among individuals is described by a random matrix model. There are two essential parameters in our approach. The strength of the linguistic interaction β, which is considered as a genetically determined ability, and the number N of sounds employed (the lexicon size). Our model of linguistic interaction is analytically studied using methods of statistical physics and simulated by Monte Carlo techniques. The analysis reveals an intricate relationship between the innate propensity for language acquisition β and the lexicon size N, N~exp(β). Thus a small increase of the genetically determined β may lead to an incredible lexical explosion. Our approximate scheme offers an explanation for the biological affinity of different species and their simultaneous linguistic disparity.

  10. [First language acquisition research and theories of language acquisition].

    Science.gov (United States)

    Miller, S; Jungheim, M; Ptok, M

    2014-04-01

    In principle, a child can seemingly easily acquire any given language. First language acquisition follows a certain pattern which to some extent is found to be language independent. Since time immemorial, it has been of interest why children are able to acquire language so easily. Different disciplinary and methodological orientations addressing this question can be identified. A selective literature search in PubMed and Scopus was carried out and relevant monographies were considered. Different, partially overlapping phases can be distinguished in language acquisition research: whereas in ancient times, deprivation experiments were carried out to discover the "original human language", the era of diary studies began in the mid-19th century. From the mid-1920s onwards, behaviouristic paradigms dominated this field of research; interests were focussed on the determination of normal, average language acquisition. The subsequent linguistic period was strongly influenced by the nativist view of Chomsky and the constructivist concepts of Piaget. Speech comprehension, the role of speech input and the relevance of genetic disposition became the centre of attention. The interactionist concept led to a revival of the convergence theory according to Stern. Each of these four major theories--behaviourism, cognitivism, interactionism and nativism--have given valuable and unique impulses, but no single theory is universally accepted to provide an explanation of all aspects of language acquisition. Moreover, it can be critically questioned whether clinicians consciously refer to one of these theories in daily routine work and whether therapies are then based on this concept. It remains to be seen whether or not new theories of grammar, such as the so-called construction grammar (CxG), will eventually change the general concept of language acquisition.

  11. 76 FR 30362 - Federal Acquisition Regulation; Submission for OMB Review; Acquisition of Helium

    Science.gov (United States)

    2011-05-25

    ... ADMINISTRATION [OMB Control No. 9000-0113; Docket 2011-0079; Sequence 5] Federal Acquisition Regulation; Submission for OMB Review; Acquisition of Helium AGENCY: Department of Defense (DOD), General Services... approved information collection requirement concerning acquisition of helium. Public comments...

  12. Accelerated dynamic EPR imaging using fast acquisition and compressive recovery

    Science.gov (United States)

    Ahmad, Rizwan; Samouilov, Alexandre; Zweier, Jay L.

    2016-12-01

    Electron paramagnetic resonance (EPR) allows quantitative imaging of tissue redox status, which provides important information about ischemic syndromes, cancer and other pathologies. For continuous wave EPR imaging, however, poor signal-to-noise ratio and low acquisition efficiency limit its ability to image dynamic processes in vivo including tissue redox, where conditions can change rapidly. Here, we present a data acquisition and processing framework that couples fast acquisition with compressive sensing-inspired image recovery to enable EPR-based redox imaging with high spatial and temporal resolutions. The fast acquisition (FA) allows collecting more, albeit noisier, projections in a given scan time. The composite regularization based processing method, called spatio-temporal adaptive recovery (STAR), not only exploits sparsity in multiple representations of the spatio-temporal image but also adaptively adjusts the regularization strength for each representation based on its inherent level of the sparsity. As a result, STAR adjusts to the disparity in the level of sparsity across multiple representations, without introducing any tuning parameter. Our simulation and phantom imaging studies indicate that a combination of fast acquisition and STAR (FASTAR) enables high-fidelity recovery of volumetric image series, with each volumetric image employing less than 10 s of scan. In addition to image fidelity, the time constants derived from FASTAR also match closely to the ground truth even when a small number of projections are used for recovery. This development will enhance the capability of EPR to study fast dynamic processes that cannot be investigated using existing EPR imaging techniques.

  13. Essays on mergers and acquisitions

    NARCIS (Netherlands)

    Faelten, A.I.

    2016-01-01

    “Essays on Mergers and Acquisitions" tackles some of the most prominent business challenges related to M&A activity. The Introduction examines the reasons why deals fail through well-known case studies; Chapter 1 presents a new index measuring countries M&A maturity worldwide; Chapter 2 focus on the

  14. Acquisition streamlining: A cultural change

    Science.gov (United States)

    Stewart, Jesse

    1992-01-01

    The topics are presented in viewgraph form and include the following: the defense systems management college, educational philosophy, the defense acquisition environment, streamlining initiatives, organizational streamlining types, defense law review, law review purpose, law review objectives, the Public Law Pilot Program, and cultural change.

  15. Bilingualism and Third Language Acquisition.

    Science.gov (United States)

    Garate, Jose Valencia; Iragui, Jasone Cenoz

    A study investigated the role of bilingualism (Basque/Spanish) and motivation in third (English) language acquisition in Spain's Basque country. Subjects were 321 secondary school students in two programs, one with instruction primarily in Spanish and one with instruction primarily in Basque. The following independent variables were analyzed in…

  16. The SINQ data acquisition environment

    Energy Technology Data Exchange (ETDEWEB)

    Maden, D. [Paul Scherrer Inst. (PSI), Villigen (Switzerland)

    1996-11-01

    The data acquisition environment for the neutron scattering instruments supported by LNS at SINQ is described. The intention is to provide future users with the necessary background to the computing facilities on site rather than to present a user manual for the on-line system. (author) 5 figs., 6 refs.

  17. More Mergers,More Acquisitions

    Institute of Scientific and Technical Information of China (English)

    LAN XINZHEN

    2010-01-01

    @@ A new round of corporate mergers and acquisitions(M&As)is on the way.On September 6,the State Council announced that it would require companies in the automobile,iron and steel,cement,machinery manufacturing,electrolytic aluminum and rare earth industries to accelerate M&As.

  18. More Mergers,More Acquisitions

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    China aims to maintain sound development of the national economy through M&As Anew round of corporate mergers and acquisitions (M&As) is on the way. On September 6, the State Council announced that it would require companies in the automobile, iron and steel, cement, machinery manufacturing, electro- lytic aluminum and rare earth industries to accelerate M&As.

  19. Analog Input Data Acquisition Software

    Science.gov (United States)

    Arens, Ellen

    2009-01-01

    DAQ Master Software allows users to easily set up a system to monitor up to five analog input channels and save the data after acquisition. This program was written in LabVIEW 8.0, and requires the LabVIEW runtime engine 8.0 to run the executable.

  20. Soviet Studies in Language Acquisition

    Science.gov (United States)

    Smith, Paul R., Jr.

    1973-01-01

    Article surveys the special theories and empirical studies of language acquisition carried out by Soviet psychologists, especially in the period since 1950. The basic principles of materialism, historicism and social reference characteristic of Soviet Marxist psychology are placed in contrast to certain current tendencies in American linguistics.…

  1. Language Acquisition and Language Revitalization

    Science.gov (United States)

    O'Grady, William; Hattori, Ryoko

    2016-01-01

    Intergenerational transmission, the ultimate goal of language revitalization efforts, can only be achieved by (re)establishing the conditions under which an imperiled language can be acquired by the community's children. This paper presents a tutorial survey of several key points relating to language acquisition and maintenance in children,…

  2. Language Acquisition and Language Revitalization

    Science.gov (United States)

    O'Grady, William; Hattori, Ryoko

    2016-01-01

    Intergenerational transmission, the ultimate goal of language revitalization efforts, can only be achieved by (re)establishing the conditions under which an imperiled language can be acquired by the community's children. This paper presents a tutorial survey of several key points relating to language acquisition and maintenance in children,…

  3. SECOND LANGUAGE ACQUISITION: GRAMMAR CONSTRUCTION ...

    African Journals Online (AJOL)

    same general cognitive problem-solving mechanisms that are involved in the acquisition of .... teaching. 3. Structural differences between Afrikaans, English and French ..... emphasis was on vocabulary, reading and writing, and English was frequently ... in a story-telling task and a question task based on a picture sequence.

  4. Defense Acquisitions Acronyms and Terms

    Science.gov (United States)

    2012-12-01

    AMSDL Acquisition Management Systems Data List ANSI American National Standards Institute AO Operational Availability AoA Analysis of...Erasable Programmable Read-Only Memory EFA Engineering Field Activity EFD Engineering Field Division EI Enterprise Integration EIT External...Ground Intercept Point GNP Gross National Product GOCO Government-Owned, Contractor-Operated (Facility) GOGO Government-Owned, Government

  5. Input and Second Language Acquisition

    Institute of Scientific and Technical Information of China (English)

    周笑盈

    2011-01-01

    The behaviorist, the mentalist and the interactionist have different emphases on the role input in Second Language Acquisition. In order to protrude the importance of second language teaching, it is indispensible to discuss the characteristics of input and to explore its effects.

  6. Survey design for blended acquisition

    NARCIS (Netherlands)

    Blacquière, G.; Berkhout, A.J.; Verschuur, D.J.

    2009-01-01

    When designing an acquisition geometry for the case of source blending, it is important that the blended source arrays are capable of transmitting a wavefield with a large spatial and temporal bandwidth: the wavefield must be incoherent. We call this incoherent shooting. Furthermore, the array must

  7. Data Acquisition for Modular Biometric Monitoring System

    Science.gov (United States)

    Chmiel, Alan J. (Inventor); Humphreys, Bradley T. (Inventor); Grodsinsky, Carlos M. (Inventor)

    2014-01-01

    A modular system for acquiring biometric data includes a plurality of data acquisition modules configured to sample biometric data from at least one respective input channel at a data acquisition rate. A representation of the sampled biometric data is stored in memory of each of the plurality of data acquisition modules. A central control system is in communication with each of the plurality of data acquisition modules through a bus. The central control system is configured to collect data asynchronously, via the bus, from the memory of the plurality of data acquisition modules according to a relative fullness of the memory of the plurality of data acquisition modules.

  8. [Tomodensitometry: current technique and perspectives].

    Science.gov (United States)

    Bousquet, J C

    1994-10-01

    The inventors of computed tomography were rewarded by the Nobel Prize for Medicine in 1979. This apparatus, now used routinely, is based on the physical principle of attenuation of x-rays combined with computerised calculation to generate a tomographic image of the human body. This article describes the components of computed tomography, the mode of acquisition, calculation and image reconstruction and the criteria of image quality and artefacts. Continuous rotation of the x-ray tube, now available on the latest machines, allows rapid 3D acquisition of raw data, largely eliminating movement artefacts, particularly those related to respiration. It is also possible to reconstitute images in a different plane from the plane of acquisition and to obtain 3D representations of the volume studied. The advantages and disadvantages of this recent technique are discussed.

  9. Buffer Gas Acquisition and Storage

    Science.gov (United States)

    Parrish, Clyde F.; Lueck, Dale E.; Jennings, Paul A.; Callahan, Richard A.; Delgado, H. (Technical Monitor)

    2001-01-01

    The acquisition and storage of buffer gases (primarily argon and nitrogen) from the Mars atmosphere provides a valuable resource for blanketing and pressurizing fuel tanks and as a buffer gas for breathing air for manned missions. During the acquisition of carbon dioxide (CO2), whether by sorption bed or cryo-freezer, the accompanying buffer gases build up in the carbon dioxide acquisition system, reduce the flow of CO2 to the bed, and lower system efficiency. It is this build up of buffer gases that provide a convenient source, which must be removed, for efficient capture Of CO2 Removal of this buffer gas barrier greatly improves the charging rate of the CO2 acquisition bed and, thereby, maintains the fuel production rates required for a successful mission. Consequently, the acquisition, purification, and storage of these buffer gases are important goals of ISRU plans. Purity of the buffer gases is a concern e.g., if the CO, freezer operates at 140 K, the composition of the inert gas would be approximately 21 percent CO2, 50 percent nitrogen, and 29 percent argon. Although there are several approaches that could be used, this effort focused on a hollow-fiber membrane (HFM) separation method. This study measured the permeation rates of CO2, nitrogen (ND, and argon (Ar) through a multiple-membrane system and the individual membranes from room temperature to 193K and 10 kpa to 300 kPa. Concentrations were measured with a gas chromatograph that used a thermoconductivity (TCD) detector with helium (He) as the carrier gas. The general trend as the temperature was lowered was for the membranes to become more selective, In addition, the relative permeation rates between the three gases changed with temperature. The end result was to provide design parameters that could be used to separate CO2 from N2 and Ar.

  10. Buffer gas acquisition and storage

    Science.gov (United States)

    Parrish, Clyde F.; Lueck, Dale E.; Jennings, Paul A.

    2001-02-01

    The acquisition and storage of buffer gases (primarily argon and nitrogen) from the Mars atmosphere provides a valuable resource for blanketing and pressurizing fuel tanks and as a buffer gas for breathing air for manned missions. During the acquisition of carbon dioxide (CO2), whether by sorption bed or cryo-freezer, the accompanying buffer gases build up in the carbon dioxide acquisition system, reduce the flow of CO2 to the bed, and lower system efficiency. It is this build up of buffer gases that provide a convenient source, which must be removed, for efficient capture of CO2. Removal of this buffer gas barrier greatly improves the charging rate of the CO2 acquisition bed and, thereby, maintains the fuel production rates required for a successful mission. Consequently, the acquisition, purification, and storage of these buffer gases are important goals of ISRU plans. Purity of the buffer gases is a concern e.g., if the CO2 freezer operates at 140 K, the composition of the inert gas would be approximately 21 percent CO2, 50 percent nitrogen, and 29 percent argon. Although there are several approaches that could be used, this effort focused on a hollow-fiber membrane (HFM) separation method. This study measured the permeation rates of CO2, nitrogen (N2), and argon (Ar) through a multiple-membrane system and the individual membranes from room temperature to 193 K and 10 kPa to 300 kPa. Concentrations were measured with a gas chromatograph. The end result was data necessary to design a system that could separate CO2, N2, and Ar. .

  11. Matched-filter acquisition for BOLD fMRI.

    Science.gov (United States)

    Kasper, Lars; Haeberlin, Maximilian; Dietrich, Benjamin E; Gross, Simon; Barmet, Christoph; Wilm, Bertram J; Vannesjo, S Johanna; Brunner, David O; Ruff, Christian C; Stephan, Klaas E; Pruessmann, Klaas P

    2014-10-15

    We introduce matched-filter fMRI, which improves BOLD (blood oxygen level dependent) sensitivity by variable-density image acquisition tailored to subsequent image smoothing. Image smoothing is an established post-processing technique used in the vast majority of fMRI studies. Here we show that the signal-to-noise ratio of the resulting smoothed data can be substantially increased by acquisition weighting with a weighting function that matches the k-space filter imposed by the smoothing operation. We derive the theoretical SNR advantage of this strategy and propose a practical implementation of 2D echo-planar acquisition matched to common Gaussian smoothing. To reliably perform the involved variable-speed trajectories, concurrent magnetic field monitoring with NMR probes is used. Using this technique, phantom and in vivo measurements confirm reliable SNR improvement in the order of 30% in a "resting-state" condition and prove robust in different regimes of physiological noise. Furthermore, a preliminary task-based visual fMRI experiment equally suggests a consistent BOLD sensitivity increase in terms of statistical sensitivity (average t-value increase of about 35%). In summary, our study suggests that matched-filter acquisition is an effective means of improving BOLD SNR in studies that rely on image smoothing at the post-processing level. Copyright © 2014 Elsevier Inc. All rights reserved.

  12. 48 CFR 307.104-70 - Acquisition strategy.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 4 2010-10-01 2010-10-01 false Acquisition strategy. 307... AND ACQUISITION PLANNING ACQUISITION PLANNING Acquisition Planning 307.104-70 Acquisition strategy... designated by the HHS CIO, DASFMP, the CAO, or the cognizant HCA) shall prepare an acquisition strategy...

  13. Kellwood Company Finalizes Acquisition of ADAM

    Institute of Scientific and Technical Information of China (English)

    2010-01-01

    The Town and Country-based apparel company Kellwood Company announced its acquisition of ADAM according to Michael Kramer,Chief Executive Officer and President of Kellwood.This acquisition is the first in

  14. 48 CFR 434.004 - Acquisition strategy.

    Science.gov (United States)

    2010-10-01

    ... information technology systems are included in the USDA Information Technology Capital Planning and Investment... manager will develop, in coordination with the Acquisition Executive or Major Information Technology... approval of the Acquisition Executive or Major Information Technology Systems Executive, a project...

  15. Liforac - A Model For Live Forensic Acquisition

    CSIR Research Space (South Africa)

    Grobler, MM

    2009-10-01

    Full Text Available The candidate's research investigated the development of a model for Live Forensic Acquisition - Liforac. The Liforac model is a wide-ranging model that presents many of the most important aspects related to Live Forensic Acquisition, suggesting...

  16. An Annotated Bibliography on Second Language Acquisition

    Science.gov (United States)

    1994-06-01

    This report summarizes representative literature in second language acquisition and learning. Writings by the major theorists and researchers were...Summaries of the articles are provided. Second language acquisition , Retention, Foreign language, Language. Interlanguage,

  17. Offline synchronization of data acquisition systems using system identification

    Science.gov (United States)

    Maes, K.; Reynders, E.; Rezayat, A.; Roeck, G. De; Lombaert, G.

    2016-10-01

    This paper presents a technique for offline time synchronization of data acquisition systems. The technique can be applied when real-time synchronization of data acquisition systems is impossible or not sufficiently accurate. It allows for accurate synchronization based on the acquired dynamic response of the structure only, without requiring a common response or the use of a trigger signal. The synchronization is performed using the results obtained from system identification, and assumes linear dynamic behavior of the structure and proportional damping of the structural modes. A demonstration for a laboratory experiment on a cantilever steel beam shows that the proposed methodology can be used for accurate time synchronization, resulting in a significant improvement of the accuracy of the identified mode shapes.

  18. Conceptual knowledge acquisition in biomedicine: A methodological review.

    Science.gov (United States)

    Payne, Philip R O; Mendonça, Eneida A; Johnson, Stephen B; Starren, Justin B

    2007-10-01

    The use of conceptual knowledge collections or structures within the biomedical domain is pervasive, spanning a variety of applications including controlled terminologies, semantic networks, ontologies, and database schemas. A number of theoretical constructs and practical methods or techniques support the development and evaluation of conceptual knowledge collections. This review will provide an overview of the current state of knowledge concerning conceptual knowledge acquisition, drawing from multiple contributing academic disciplines such as biomedicine, computer science, cognitive science, education, linguistics, semiotics, and psychology. In addition, multiple taxonomic approaches to the description and selection of conceptual knowledge acquisition and evaluation techniques will be proposed in order to partially address the apparent fragmentation of the current literature concerning this domain.

  19. Corpus-Driven Knowledge Acquisition for Discourse Analysis

    CERN Document Server

    Soderland, S; Soderland, Stephen; Lehnert, Wendy

    1994-01-01

    The availability of large on-line text corpora provides a natural and promising bridge between the worlds of natural language processing (NLP) and machine learning (ML). In recent years, the NLP community has been aggressively investigating statistical techniques to drive part-of-speech taggers, but application-specific text corpora can be used to drive knowledge acquisition at much higher levels as well. In this paper we will show how ML techniques can be used to support knowledge acquisition for information extraction systems. It is often very difficult to specify an explicit domain model for many information extraction applications, and it is always labor intensive to implement hand-coded heuristics for each new domain. We have discovered that it is nevertheless possible to use ML algorithms in order to capture knowledge that is only implicitly present in a representative text corpus. Our work addresses issues traditionally associated with discourse analysis and intersentential inference generation, and de...

  20. Pidginization and Creolization as Language Acquisition.

    Science.gov (United States)

    Andersen, Roger W., Ed.

    Pidginization and creolization are addressed from a language acquisition perspective. The 18 collected papers are organized around four areas of inquiry: (1) simplification in input to pidginization and second language acquisition, (2) simplification in interlanguage, (3) creolization and language acquisition, and (4) decreolization and language…

  1. Neurobiological Mechanisms of Language Acquisition. Review Article.

    Science.gov (United States)

    Pulvermuller, Friedemann; Schumann, John H.

    1994-01-01

    Specifies language acquisition processes in terms of brain mechanisms to explain the variable success achieved by early and late learners and proposes a brain-based model for language acquisition on the basis of the literature. Two conditions for full acquisition of a language are motivation and grammatical ability. The neural underpinnings for…

  2. 23 CFR 710.309 - Acquisition.

    Science.gov (United States)

    2010-04-01

    ... 23 Highways 1 2010-04-01 2010-04-01 false Acquisition. 710.309 Section 710.309 Highways FEDERAL... ESTATE Project Development § 710.309 Acquisition. The process of acquiring real property includes... settlements, and condemnation. The State shall conduct acquisition and related relocation activities...

  3. 48 CFR 970.2301 - Sustainable acquisition.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 5 2010-10-01 2010-10-01 false Sustainable acquisition. 970.2301 Section 970.2301 Federal Acquisition Regulations System DEPARTMENT OF ENERGY AGENCY..., Renewable Energy Technologies, Occupational Safety and Drug-Free Work Place 970.2301 Sustainable...

  4. IT Consultants in Acquisition IT Integration

    DEFF Research Database (Denmark)

    Henningsson, Stefan; Øhrgaard, Christian

    2016-01-01

    model, depicting the use of external consultants in acquisition IT integration, contributes to the literature on acquisition IT integration by providing an explanation for IT-based value creation in acquisition that is rooted in the external of the acquirer. In addition to adding to the limited...

  5. Managing IT Integration Risk in Acquisitions

    DEFF Research Database (Denmark)

    Henningsson, Stefan; Kettinger, William J.

    2016-01-01

    The article discusses a framework for evaluating risk of information technology (IT) integration in acquisitions. Topics include the use of the experience of serial acquirer Trelleborg AB to show the merits of the framework for managing the risk and to determine low-risk acquisitions......, the importance of managing IT integration risk, and various risk areas for acquisition IT integration....

  6. Acquisition of HPLC-Mass Spectrometer

    Science.gov (United States)

    2015-08-18

    31-Jan-2015 Approved for Public Release; Distribution Unlimited Final Report: Acquisition of HPLC -Mass Spectrometer The views, opinions and/or findings...published in peer-reviewed journals: Final Report: Acquisition of HPLC -Mass Spectrometer Report Title The acquisition of the mass spectrometer has been a

  7. COOPERATIVE LEARNING AS AN ENVIRONMENT FOR FOREIGN LANGUAGE ACQUISITION

    OpenAIRE

    SERNIAK O.M.

    2012-01-01

    The article concentrates on ways of providing opportunities for meaningful interaction in foreign language classroom settings. The investigation deals with the analysis of cooperative learning as an environment for foreign language acquisition at a university level. The article explores several methods and activities that are for most part compatible with an interactional approach. Special techniques of implementation cooperative learning activities in foreign language classroom settings are ...

  8. Optimizing Department of Defense Acquisition Development Test and Evaluation Scheduling

    Science.gov (United States)

    2015-06-01

    Technique PMO program management office R&D research and development RCPSP resource-constrained project scheduling problem SME subject matter...Program Management Office ( PMO ) test personnel develop test schedules manually using time estimates and heuristic subject matter expert (SME) advice...on several SMEs and PMO test personnel to develop the initial test schedule for any new acquisition. This is used to establish an initial plan for

  9. Acquisition and sources. [documents for scientific and technical information systems

    Science.gov (United States)

    Eckert, P. F.

    1978-01-01

    Suggestions and ideas for acquiring documents or their surrogates for a planned or fledgling information system are offered. The problems of selectivity of documents or their surrogates, both in superabundant quantities, and duplicate checking are highlighted. Acquisitioning flow, a semiautomated duplicate search technique, and alerting methods for prospective documentation are described. Appendices include two category systems, selected definitions and acronyms, and a selected address list for document procurement.

  10. Conceptual Knowledge Acquisition in Biomedicine: A Methodological Review

    OpenAIRE

    Payne, Philip R.O.; Mendonça, Eneida A.; Johnson, Stephen B.; Starren, Justin B.

    2007-01-01

    The use of conceptual knowledge collections or structures within the biomedical domain is pervasive, spanning a variety of applications including controlled terminologies, semantic networks, ontologies, and database schemas. A number of theoretical constructs and practical methods or techniques support the development and evaluation of conceptual knowledge collections. This review will provide an overview of the current state of knowledge concerning conceptual knowledge acquisition, drawing f...

  11. Compressive Acquisition of Dynamic Scenes

    CERN Document Server

    Sankaranarayanan, Aswin C; Chellappa, Rama; Baraniuk, Richard G

    2012-01-01

    Compressive sensing (CS) is a new approach for the acquisition and recovery of sparse signals and images that enables sampling rates significantly below the classical Nyquist rate. Despite significant progress in the theory and methods of CS, little headway has been made in compressive video acquisition and recovery. Video CS is complicated by the ephemeral nature of dynamic events, which makes direct extensions of standard CS imaging architectures and signal models difficult. In this paper, we develop a new framework for video CS for dynamic textured scenes that models the evolution of the scene as a linear dynamical system (LDS). This reduces the video recovery problem to first estimating the model parameters of the LDS from compressive measurements, and then reconstructing the image frames. We exploit the low-dimensional dynamic parameters (the state sequence) and high-dimensional static parameters (the observation matrix) of the LDS to devise a novel compressive measurement strategy that measures only the...

  12. Photovoltaic module parameters acquisition model

    Science.gov (United States)

    Cibira, Gabriel; Koščová, Marcela

    2014-09-01

    This paper presents basic procedures for photovoltaic (PV) module parameters acquisition using MATLAB and Simulink modelling. In first step, MATLAB and Simulink theoretical model are set to calculate I-V and P-V characteristics for PV module based on equivalent electrical circuit. Then, limited I-V data string is obtained from examined PV module using standard measurement equipment at standard irradiation and temperature conditions and stated into MATLAB data matrix as a reference model. Next, the theoretical model is optimized to keep-up with the reference model and to learn its basic parameters relations, over sparse data matrix. Finally, PV module parameters are deliverable for acquisition at different realistic irradiation, temperature conditions as well as series resistance. Besides of output power characteristics and efficiency calculation for PV module or system, proposed model validates computing statistical deviation compared to reference model.

  13. The ALICE data acquisition system

    CERN Document Server

    Carena, F; Chapeland, S; Chibante Barroso, V; Costa, F; Dénes, E; Divià, R; Fuchs, U; Grigore, A; Kiss, T; Simonetti, G; Soós, C; Telesca, A; Vande Vyvre, P; Von Haller, B

    2014-01-01

    In this paper we describe the design, the construction, the commissioning and the operation of the Data Acquisition (DAQ) and Experiment Control Systems (ECS) of the ALICE experiment at the CERN Large Hadron Collider (LHC). The DAQ and the ECS are the systems used respectively for the acquisition of all physics data and for the overall control of the experiment. They are two computing systems made of hundreds of PCs and data storage units interconnected via two networks. The collection of experimental data from the detectors is performed by several hundreds of high-speed optical links. We describe in detail the design considerations for these systems handling the extreme data throughput resulting from central lead ions collisions at LHC energy. The implementation of the resulting requirements into hardware (custom optical links and commercial computing equipment), infrastructure (racks, cooling, power distribution, control room), and software led to many innovative solutions which are described together with ...

  14. A review of spelling acquisition

    DEFF Research Database (Denmark)

    Dich, Nadya; Cohn, Abigail C.

    2013-01-01

    literacy factors into modeling phonological knowledge. In this article, we show that the spelling acquisition data support and are best accounted for by models allowing for a hierarchy of representations, that learning to read and write has a profound effect on the phonological knowledge of an adult......This review article discusses how empirical data on the acquisition of spelling by children inform the question of the psycholinguistic validity of the phoneme, a concept central (at least implicitly) to most phonological theories. The paper reviews data on children's early spelling attempts...... as well as on the development of spelling proficiency. The evidence highlighted in the paper presents a number of challenges for many conceptions of the phoneme, which do not account for the complexity of the developmental data. A synthetic interpretation of the apparently contradictory evidence...

  15. DANSS Experiment Data Acquisition System

    CERN Document Server

    Hons, Zdenek

    2016-01-01

    DANSS (Detector of the reactor AntiNeutrino based on Solid Scintillator) is a project aiming to measure a spectrum of reactor antineutrinos using inverse beta decay (IBD) in a plastic scintillator. The detector is located close to an industrial nuclear reactor core and is covered by passive and active shielding. It is expected to detect about 15000 IBD events per day. Light from the detector is sensed by PMT and SiPM. This paper describes the data acquisition system used for data readout of the 50 detector PMT channels and active shielding. Theoretical approach to the data acquisition is described and two possible solutions using QDCs and digitizers are discussed. Also described are the results of the DAQ performance during routine data taking operation of the detector.

  16. Music and early language acquisition.

    Science.gov (United States)

    Brandt, Anthony; Gebrian, Molly; Slevc, L Robert

    2012-01-01

    Language is typically viewed as fundamental to human intelligence. Music, while recognized as a human universal, is often treated as an ancillary ability - one dependent on or derivative of language. In contrast, we argue that it is more productive from a developmental perspective to describe spoken language as a special type of music. A review of existing studies presents a compelling case that musical hearing and ability is essential to language acquisition. In addition, we challenge the prevailing view that music cognition matures more slowly than language and is more difficult; instead, we argue that music learning matches the speed and effort of language acquisition. We conclude that music merits a central place in our understanding of human development.

  17. Music and Early Language Acquisition

    Directory of Open Access Journals (Sweden)

    Anthony K. Brandt

    2012-09-01

    Full Text Available Language is typically viewed as fundamental to human intelligence. Music, while recognized as a human universal, is often treated as an ancillary ability—one dependent on or derivative of language. In contrast, we argue that it is more productive from a developmental perspective to describe spoken language as a special type of music. A review of existing studies presents a compelling case that musical hearing and ability is essential to language acquisition. In addition, the authors challenge the prevailing view that music cognition matures more slowly than language and is more difficult; instead, the authors present evidence that music learning matches the speed and effort of language acquisition. We conclude that music merits a central place in our understanding of human development.

  18. Music and Early Language Acquisition

    Science.gov (United States)

    Brandt, Anthony; Gebrian, Molly; Slevc, L. Robert

    2012-01-01

    Language is typically viewed as fundamental to human intelligence. Music, while recognized as a human universal, is often treated as an ancillary ability – one dependent on or derivative of language. In contrast, we argue that it is more productive from a developmental perspective to describe spoken language as a special type of music. A review of existing studies presents a compelling case that musical hearing and ability is essential to language acquisition. In addition, we challenge the prevailing view that music cognition matures more slowly than language and is more difficult; instead, we argue that music learning matches the speed and effort of language acquisition. We conclude that music merits a central place in our understanding of human development. PMID:22973254

  19. COLDEX New Data Acquisition Framework

    CERN Document Server

    Grech, Christian

    2015-01-01

    COLDEX (COLD bore EXperiment) is an experiment of the TE-VSC group installed in the Super Proton Synchrotron (SPS) which mimics a LHC type cryogenic vacuum system. In the framework of the High Luminosity upgrade of the LHC (HL-LHC project), COLDEX has been recommissioned in 2014 in order to validate carbon coatings performances at cryogenic temperature with LHC type beams. To achieve this mission, a data acquisition system is needed to retrieve and store information from the different experiment’s systems (vacuum, cryogenics, controls, safety) and perform specific calculations. This work aimed to completely redesign, implement, test and operate a brand new data acquisition framework based on communication with the experiment’s PLCs for the devices potentially available over network. The communication protocol to the PLCs is based on data retrieval both from CERN middleware infrastructures (CMW, JAPC) and on a novel open source Simatic S7 data exchange package over TCP/IP (libnodave).

  20. Data Acquisition and Mass Storage

    Science.gov (United States)

    Vande Vyvre, P.

    2004-08-01

    The experiments performed at supercolliders will constitute a new challenge in several disciplines of High Energy Physics and Information Technology. This will definitely be the case for data acquisition and mass storage. The microelectronics, communication, and computing industries are maintaining an exponential increase of the performance of their products. The market of commodity products remains the largest and the most competitive market of technology products. This constitutes a strong incentive to use these commodity products extensively as components to build the data acquisition and computing infrastructures of the future generation of experiments. The present generation of experiments in Europe and in the US already constitutes an important step in this direction. The experience acquired in the design and the construction of the present experiments has to be complemented by a large R&D effort executed with good awareness of industry developments. The future experiments will also be expected to follow major trends of our present world: deliver physics results faster and become more and more visible and accessible. The present evolution of the technologies and the burgeoning of GRID projects indicate that these trends will be made possible. This paper includes a brief overview of the technologies currently used for the different tasks of the experimental data chain: data acquisition, selection, storage, processing, and analysis. The major trends of the computing and networking technologies are then indicated with particular attention paid to their influence on the future experiments. Finally, the vision of future data acquisition and processing systems and their promise for future supercolliders is presented.

  1. The Cybersecurity Challenge in Acquisition

    Science.gov (United States)

    2016-04-30

    in turn introduce new vulnerabilities in the organization and must be managed by those acquisition specialists focused most on the supply chain ...which helps develop supply chain specific security risk mitigation implementation plans, ISO 2800-2700 (Specification for security management systems...entrusted to you by third parties) secured. The CPNI proposes that supply chain security risk be an extension of existing risk management processes. The

  2. Young Instrumentalists’ Music Literacy Acquisition

    OpenAIRE

    Blix, Hilde Synnøve

    2015-01-01

    ABSTRACT The aim of this article is to present and discuss the findings of a research project concerning music literacy acquisition among young beginners on music instruments. The reported project examines the learning strategies that young students use in order to make sense of notated music in the first year of training. Theories from the research field of language learning are applied to illuminate music literacy as a learning process. Observations and interviews were used to collect da...

  3. Algebraic learning for language acquisition

    Science.gov (United States)

    Farrell, Kevin R.; Mammone, Richard J.; Gorin, Allen

    1994-02-01

    This paper explores the application of new algorithms to the adaptive language acquisition model formulated by Gorin. The new methods consists of incremental approaches for the algebraic learning of statistical associations proposed by Tishby. The incremental methods are evaluated on a text-based natural language experiment, namely the inward call manager task. Performance is evaluated with respect to the alternative methods, namely the smooth mutual information method and the pseudo-inverse solution.

  4. Programmable fast data acquisition system

    Science.gov (United States)

    Montebugnoli, S.; Bianchi, G.; Zoni, L.

    The goal of this work is to investigate the possibility to install on modern radiotelescopes a fast and programmable backend instead of several backends, each dedicated to a single acquisition task. Such an approach could lower the costs and make available a more compact and flexible back end. Exploiting the state-of-the-art of the FPGAs (Field Programmable Gate Arrays) and innovative architectures, a programmable system might be conceived.

  5. 76 FR 12357 - Federal Acquisition Regulation; Information Collection; Acquisition of Helium

    Science.gov (United States)

    2011-03-07

    ...; Docket 2011-0079; Sequence 5] Federal Acquisition Regulation; Information Collection; Acquisition of... requirement concerning acquisition of helium. Public comments are particularly invited on: Whether this... cite OMB Control No. 9000-0113, Acquisition of Helium, in all correspondence. Dated: February 24,...

  6. 78 FR 80367 - Federal Acquisition Regulation; Federal Acquisition Circular 2005-72; Introduction

    Science.gov (United States)

    2013-12-31

    ...This document summarizes the Federal Acquisition Regulation (FAR) rules agreed to by the Civilian Agency Acquisition Council and the Defense Acquisition Regulations Council (Councils) in this Federal Acquisition Circular (FAC) 2005-72. A companion document, the Small Entity Compliance Guide (SECG), follows this FAC. The FAC, including the SECG, is available via the Internet at......

  7. Development of an operator`s mental model acquisition system. 1. Estimation of a physical mental model acquisition system

    Energy Technology Data Exchange (ETDEWEB)

    Ikeda, Mitsuru; Mizoguchi, Riichirou [Inst. of Scientific and Industrial Research, Osaka Univ., Ibaraki (Japan); Yoshikawa, Shinji; Ozawa, Kenji

    1997-03-01

    This report describes a technical survey of acquisition method of an operator`s understanding for functions and structures of his target nuclear plant. This method is to play a key role in the information processing framework to support on-training operators in forming their knowledge of the nuclear plants. This kind of technical framework is aiming at enhancing human operator`s ability to cope with anomaly plant situations which are difficult to expect from preceding experiences or engineering surveillance. In these cases, cause identifications and responding operation selections are desired to made not only empirically but also based on thoughts about possible phenomena to take place within the nuclear plant. This report focuses on a particular element technique, defined as `explanation-based knowledge acquisition`, as the candidate technique to potentially be extended to meet the requirement written above, and discusses about applicability to the learning support system and about necessary improvements, to identify future technical developments. (author)

  8. Language acquisition and language change.

    Science.gov (United States)

    Lightfoot, David

    2010-09-01

    Children acquire a mature language system and sometimes this system differs from that of their parents. This is a significant part of language change and understanding acquisition is key to understanding this kind of change in people's internal grammars. I outline one approach to language acquisition, based on children finding cues expressed in the input they are exposed to. This enables us to understand historical change in grammars: change in external language sometimes triggers a new internal grammar as cues come to be expressed differently. Work on language variation, acquisition, and change converges, and these three areas are mutually dependent; empirical work in one area may enrich understanding more generally, opening the way to new kinds of empirical work. Seen this way, language is a complex system and language change can be treated productively in the context of complexity science. Copyright © 2010 John Wiley & Sons, Ltd. For further resources related to this article, please visit the WIREs website. Copyright © 2010 John Wiley & Sons, Ltd.

  9. Data acquisition for sensor systems

    CERN Document Server

    Taylor, H Rosemary

    1997-01-01

    'Data acquisition' is concerned with taking one or more analogue signals and converting them to digital form with sufficient accu­ racy and speed to be ready for processing by a computer. The increasing use of computers makes this an expanding field, and it is important that the conversion process is done correctly because information lost at this stage can never be regained, no matter how good the computation. The old saying - garbage in, garbage out - is very relevant to data acquisition, and so every part of the book contains a discussion of errors: where do they come from, how large are they, and what can be done to reduce them? The book aims to treat the data acquisition process in depth with less detailed chapters on the fundamental principles of measure­ ment, sensors and signal conditioning. There is also a chapter on software packages, which are becoming increasingly popular. This is such a rapidly changing topic that any review of available pro­ grams is bound to be out of date before the book re...

  10. Selection of image acquisition methods

    Science.gov (United States)

    Donnelly, Joseph J.

    1991-05-01

    A comprehensive picture archiving and communications system (PACS), such as the medical diagnostic imaging support (MDIS) system, consists of several interrelated sub systems. The image acquisition subsystem is the means by which images are introduced into the system and as such it is analogous to the ''eyes'' of the system. Images from digital modalities such as computed tomography (CT) and magnetic resonance imaging (MRI) are readily transferable to a PACS since they are acquired in a digital format. Conventional film based analog images are particularly challenging since at no point in their production or display do they exist in an electronic form suitable for transfer to the MDIS system. In recent years, commercial high resolution film digitizers and computed radiology (CR) devices have become available. These devices now provide us with the means to capture conventional radiographic images in a format suitable for transfer to a PACS. Through the careful selection of acquisition devices we can now design an image acquisition subsystem tailored to meet our clinical needs.

  11. Confidence-Based Feature Acquisition

    Science.gov (United States)

    Wagstaff, Kiri L.; desJardins, Marie; MacGlashan, James

    2010-01-01

    Confidence-based Feature Acquisition (CFA) is a novel, supervised learning method for acquiring missing feature values when there is missing data at both training (learning) and test (deployment) time. To train a machine learning classifier, data is encoded with a series of input features describing each item. In some applications, the training data may have missing values for some of the features, which can be acquired at a given cost. A relevant JPL example is that of the Mars rover exploration in which the features are obtained from a variety of different instruments, with different power consumption and integration time costs. The challenge is to decide which features will lead to increased classification performance and are therefore worth acquiring (paying the cost). To solve this problem, CFA, which is made up of two algorithms (CFA-train and CFA-predict), has been designed to greedily minimize total acquisition cost (during training and testing) while aiming for a specific accuracy level (specified as a confidence threshold). With this method, it is assumed that there is a nonempty subset of features that are free; that is, every instance in the data set includes these features initially for zero cost. It is also assumed that the feature acquisition (FA) cost associated with each feature is known in advance, and that the FA cost for a given feature is the same for all instances. Finally, CFA requires that the base-level classifiers produce not only a classification, but also a confidence (or posterior probability).

  12. Foreign acquisition, plant survival, and employment growth

    DEFF Research Database (Denmark)

    Bandick, Roger; Görg, Holger

    2010-01-01

    endogeneity of acquisition using IV and propensity score matching approaches suggest that acquisition by foreign owners increases the lifetime of the acquired plants only if the plant was an exporter. The effect is robust to controlling for domestic acquisitions and differs between horizontal and vertical...... acquisitions. We find robust positive employment growth effects only for exporters and only if the takeover is vertical.......This paper analyzes the effect of foreign acquisition on survival and employment growth of targets using data on Swedish manufacturing plants.We separate targeted plants into those within Swedish MNEs, Swedish exporting non-MNEs, and purely domestic firms. The results, controlling for possible...

  13. [Software development of multi-element transient signal acquisition and processing with multi-channel ICP-AES].

    Science.gov (United States)

    Zhang, Y; Zhuang, Z; Wang, X; Zhu, E; Liu, J

    2000-02-01

    A software for multi-channel ICP-AES multi-element transient signal acquisition and processing were developed in this paper. It has been successfully applied to signal acquisition and processing in many transient introduction techniques on-line hyphenated with multi-channel ICP-AES.

  14. Improving Acquisition Outcomes with Contextual Ambidexterity

    DEFF Research Database (Denmark)

    Meglio, Olimpia; King, David R.; Risberg, Annette

    2015-01-01

    The results of research on mergers and acquisitions often point to a need to improve acquisition outcomes and lessen the organizational turmoil that can often follow integration efforts. We assert that viewing acquisition integration through the lens of contextual ambidexterity may improve...... acquisition outcomes in two ways: by providing an integrated solution to the economic and social tensions in acquisitions, and by enabling managers to effectively confront the competing needs of task and human integration. We also posit that by building on contextual ambidexterity, we can extend...... the possibilities for both research and practice regarding task and human integration in acquisitions. We also emphasize the role of an integration manager and integration mechanisms in enabling contextual ambidexterity for successful acquisition integration. Finally, we identify implications for research...

  15. Acquisitions by EMNCs in Developed Markets

    DEFF Research Database (Denmark)

    Rabbiosi, Larissa; Elia, Stefano; Bertoni, Fabio

    2012-01-01

    Building on an organisational learning perspective, we argue that emerging market firms’ international experience and home-country characteristics are core sources of learning. Furthermore, we argue that these factors constitute important determinants of emerging market firms’ acquisition behaviour...... in developed countries (south-north acquisitions). We test our hypotheses on a sample of 808 south-north acquisitions. The acquisitions were undertaken in Europe, Japan and North America (Canada and the US) between 1999 and 2008 by firms from the emerging economies of Brazil, Russia, India and China....... As suggested by the internationalisation process model, our results show that emerging market firms undertake acquisitions in developed countries in an incremental fashion. Acquisition experience in developed markets increases the likelihood of exploitative expansion, while acquisition experience in developing...

  16. Acquisition system for the CLIC Module

    CERN Document Server

    Vilalte, Sebastien

    2011-01-01

    The status of R&D activities for CLIC module acquisition are discussed [1]. LAPP is involved in the design of the local CLIC module acquisition crate, described in the document Study of the CLIC Module Front-End Acquisition and Evaluation Electronics [2]. This acquisition system is a project based on a local crate, assigned to the CLIC module, including several mother boards. These motherboards are foreseen to hold mezzanines dedicated to the different subsystems. This system has to work in radiation environment. LAPP is involved in the development of Drive Beam stripline position monitors read-out, described in the document Drive Beam Stripline BPM Electronics and Acquisition [3]. LAPP also develops a generic acquisition mezzanine that allows to perform all-around acquisition and components tests for drive beam stripline BPM read-out.

  17. Laser-induced photo emission detection: data acquisition based on light intensity counting

    Science.gov (United States)

    Yulianto, N.; Yudasari, N.; Putri, K. Y.

    2017-04-01

    Laser Induced Breakdown Detection (LIBD) is one of the quantification techniques for colloids. There are two ways of detection in LIBD: optical detection and acoustic detection. LIBD is based on the detection of plasma emission due to the interaction between particle and laser beam. In this research, the changing of light intensity during plasma formations was detected by a photodiode sensor. A photo emission data acquisition system was built to collect and transform them into digital counts. The real-time system used data acquisition device National Instrument DAQ 6009 and LABVIEW software. The system has been tested on distilled water and tap water samples. The result showed 99.8% accuracy by using counting technique in comparison to the acoustic detection with sample rate of 10 Hz, thus the acquisition system can be applied as an alternative method to the existing LIBD acquisition system.

  18. Methods for SWATH™: Data Independent Acquisition on TripleTOF Mass Spectrometers.

    Science.gov (United States)

    Holewinski, Ronald J; Parker, Sarah J; Matlock, Andrea D; Venkatraman, Vidya; Van Eyk, Jennifer E

    2016-01-01

    Data independent acquisition (DIA also termed SWATH) is an emerging technology in the field of mass spectrometry based proteomics. Although the concept of DIA has been around for over a decade, the recent advancements, in particular the speed of acquisition, of mass analyzers have pushed the technique into the spotlight and allowed for high-quality DIA data to be routinely acquired by proteomics labs. In this chapter we will discuss the protocols used for DIA acquisition using the Sciex TripleTOF mass spectrometers and data analysis using the Sciex processing software.

  19. Comparison of Super Resolution Reconstruction Acquisition Geometries for Use in Mouse Phenotyping

    Directory of Open Access Journals (Sweden)

    Niranchana Manivannan

    2013-01-01

    Full Text Available 3D isotropic imaging at high spatial resolution (30–100 microns is important for comparing mouse phenotypes. 3D imaging at high spatial resolutions is limited by long acquisition times and is not possible in many in vivo settings. Super resolution reconstruction (SRR is a postprocessing technique that has been proposed to improve spatial resolution in the slice-select direction using multiple 2D multislice acquisitions. Any 2D multislice acquisition can be used for SRR. In this study, the effects of using three different low-resolution acquisition geometries (orthogonal, rotational, and shifted on SRR images were evaluated and compared to a known standard. Iterative back projection was used for the reconstruction of all three acquisition geometries. The results of the study indicate that super resolution reconstructed images based on orthogonally acquired low-resolution images resulted in reconstructed images with higher SNR and CNR in less acquisition time than those based on rotational and shifted acquisition geometries. However, interpolation artifacts were observed in SRR images based on orthogonal acquisition geometry, particularly when the slice thickness was greater than six times the inplane voxel size. Reconstructions based on rotational geometry appeared smoother than those based on orthogonal geometry, but they required two times longer to acquire than the orthogonal LR images.

  20. Knowledge-sharing Behavior and Post-acquisition Integration Failure

    DEFF Research Database (Denmark)

    Gammelgaard, Jens; Husted, Kenneth; Michailova, Snejina

    2004-01-01

    AbstractNot achieving the anticipated synergy effects in the post-acquisition integration context is a serious causefor the high acquisition failure rate. While existing studies on failures of acquisitions exist fromeconomics, finance, strategy, organization theory, and human resources management...... important insights toexplaining the high failure rate in acquisitions.Descriptors: post-acquisition integration, acquisition failure, individual knowledge-sharing behavior...

  1. Language Change and Language Acquisition

    Directory of Open Access Journals (Sweden)

    Thorbjörg Hróarsdóttir

    2004-01-01

    Full Text Available The aim of this paper is to present diachronic changes in terms of the conditions of first language acquisition. Grammars, seen as mental organs, may change between two generations. A change is initiated when (a population of learners converge on a grammatical system which differs in at least one parameter value from the system internalized by the speakers of the previous generation. Learnability issues then connect to both language acquisition and language change, and understanding language changes depends on understanding how children acquire their native language. Acquisition is a process in which Universal Grammar (UG interacts with a context-specific set of Primary Linguistic Data (PLD: the linguistic input to the child-learner and uses these PLD as the source for triggers or cues that map the innate (preexperience knowledge to a mature grammar. If a certain phenomenon has survived through many generations, it must have been reflected clearly in the PLD. Then, if we note that it has changed, something in the language performance of the previous generation must have changed, and thereby paved the way for a new interpretation. Innovation leading to linguistic variation in the PLD and gradual changes in PLD play a central role in the explanation here: the immediate cause of a grammar change must lie in some alternation in the PLD. We will look at how the language spoken in a certain community (E-language may gradually become different from the language that originally served as the triggering experience. These changes in the E-language also mean changes in the input available to the child-learners of the next generation and a motivation for a different parameter setting has arisen.

  2. Software Switching for Data Acquisition

    CERN Document Server

    CERN. Geneva; Malone, David

    2016-01-01

    In this talk we discuss the feasibility of replacing telecom-class routers with a topology of commodity servers acting as software switches in data acquisition. We extend the popular software switch, Open vSwitch, with a dedicated, throughput-oriented buffering mechanism. We compare the performance under heavy many-to-one congestion to typical Ethernet switches and evaluate the scalability when building larger topologies, exploiting the integration with software-defined networking technologies. Please note that David Malone will speak on behalf of Grzegorz Jereczek.

  3. Employment effects of foreign acquisition

    DEFF Research Database (Denmark)

    Bandick, Roger; Karpaty, Patrik

    2011-01-01

    that the employment of skilled labor increasesmore than that of less-skilled labor. Our results indicate that the positive employment effects are more pronounced in acquired non-MNEs than in Swedish MNEs. Furthermore, we observe shifts in skill intensities toward higher shares of skilled labor in non-MNEs taken over......This paper investigates the employment effects of foreign acquisitions in acquired firms in Swedish manufacturing during the 1990s; a period characterized by a dramatic increase in foreign ownership. We find some evidence of positive employment effects in acquired firms and it seems...

  4. Sinopec to Accelerate Overseas Acquisition

    Institute of Scientific and Technical Information of China (English)

    2011-01-01

    As part of its strategic move to expand portfolio of overseas oil and gas reserves, Sinopec Group is now stepping up its efforts for acquisition of a Canadian oil and gas company. Daylight Energy Ltd. has recently agreed to be acquired by China's Sinopec International Petroleum Exploration and Production Corp. (SIPEPC) for about C$2.2 billion (US$2.1 billion). The deal for Calgary, Alberta-based Daylight is for C$10.08 per share.

  5. Two Axis Pointing System (TAPS) attitude acquisition, determination, and control

    Science.gov (United States)

    Azzolini, John D.; McGlew, David E.

    1990-12-01

    The Two Axis Pointing System (TAPS) is a 2 axis gimbal system designed to provide fine pointing of Space Transportation System (STS) borne instruments. It features center-of-mass instrument mounting and will accommodate instruments of up to 1134 kg (2500 pounds) which fit within a 1.0 by 1.0 by 4.2 meter (40 by 40 by 166 inch) envelope. The TAPS system is controlled by a microcomputer based Control Electronics Assembly (CEA), a Power Distribution Unit (PDU), and a Servo Control Unit (SCU). A DRIRU-II inertial reference unit is used to provide incremental angles for attitude propagation. A Ball Brothers STRAP star tracker is used for attitude acquisition and update. The theory of the TAPS attitude determination and error computation for the Broad Band X-ray Telescope (BBXRT) are described. The attitude acquisition is based upon a 2 star geometric solution. The acquisition theory and quaternion algebra are presented. The attitude control combines classical position, integral and derivative (PID) control with techniques to compensate for coulomb friction (bias torque) and the cable harness crossing the gimbals (spring torque). Also presented is a technique for an adaptive bias torque compensation which adjusts to an ever changing frictional torque environment. The control stability margins are detailed, with the predicted pointing performance, based upon simulation studies. The TAPS user interface, which provides high level operations commands to facilitate science observations, is outlined.

  6. Unconstrained Iris Acquisition and Recognition Using COTS PTZ Camera

    Directory of Open Access Journals (Sweden)

    Venugopalan Shreyas

    2010-01-01

    Full Text Available Abstract Uniqueness of iris patterns among individuals has resulted in the ubiquity of iris recognition systems in virtual and physical spaces, at high security facilities around the globe. Traditional methods of acquiring iris patterns in commercial systems scan the iris when an individual is at a predetermined location in front of the scanner. Most state-of-the-art techniques for unconstrained iris acquisition in literature use expensive custom equipment and are composed of a multicamera setup, which is bulky, expensive, and requires calibration. This paper investigates a method of unconstrained iris acquisition and recognition using a single commercial off-the-shelf (COTS pan-tilt-zoom (PTZ camera, that is compact and that reduces the cost of the final system, compared to other proposed hierarchical multicomponent systems. We employ state-of-the-art techniques for face detection and a robust eye detection scheme using active shape models for accurate landmark localization. Additionally, our system alleviates the need for any calibration stage prior to its use. We present results using a database of iris images captured using our system, while operating in an unconstrained acquisition mode at 1.5 m standoff, yielding an iris diameter in the 150–200 pixels range.

  7. Acquisition of English comparative adjectives.

    Science.gov (United States)

    Graziano-King, Janine; Cairns, Helen Smith

    2005-05-01

    Two experiments investigated the acquisition of English comparative adjective forms, Adj + er and more Adj. In Experiment 1, 72 children, four- and seven-years-old, indicated their preferences for the synthetic or periphrastic comparative form for 16 adjectives in a forced-choice judgement task; their responses were compared to those of a group of adults (Graziano-King, 2003). In Experiment 2, a group of 29 children, ranging in age from 5;1 to 10;9, and a group of 11 adults performed a forced-choice judgement task, similar to that of Experiment 1, and an elicited production task, responding to the same 32 adjectives for both tasks. The two studies together support an acquisition trajectory of three stages. In the first stage, children show no preference for either form of the comparative; in the second, they adopt a suffixation rule; and in the third, they abandon the general rule and become conservative learners, eventually reaching the adult target.

  8. Legality on the acquisition of

    Directory of Open Access Journals (Sweden)

    Adriana Dragone Silveira

    2011-10-01

    Full Text Available This article aims to reflect upon the acquisition of "private educational systems" by cities in the state of São Paulo, under the perspectives of the standards listed in the “Constituição Federal de 1988” (CF/88, “Lei de Diretrizes e Bases da Educação Nacional” (LDB/96 and in the “Estatuto da Criança e do Adolescente” (ECA and the actions that the Public Prosecutors Public Ministry have impetrated regarding to such acquisitions in the cities of São Bernardo do Campo and Barueri. The analysis of the normative principles indicates that the use of "private educational systems" interferes in the process of autonomy's pedagogical educational institution and also of the teachers and, in this way, restricts the principle of democratic management and the possibility of education to be taught from different pedagogical conceptions. From the analysis of the procedures instituted by the Public Prosecutors, it was observed that the actions were mainly concerned about Public Administration issues than educational legislation.

  9. Theories of early language acquisition.

    Science.gov (United States)

    Plunkett, K

    1997-07-01

    What features of brain processing and neural development support linguistic development in young children? To what extent is the profile and timing of linguistic development in young children determined by a pre-ordained genetic programme? Does the environment play a crucial role in determining the patterns of change observed in children growing up? Recent experimental, neuroimaging and computational studies of developmental change in children promise to contribute to a deeper understanding of how the brain becomes wired up for language. In this review, the muttidisciplinary perspectives of cognitive neuroscience, experimental psycholinguistics and neural network modelling are brought to bear on four distinct areas in the study of language acquisition: early speech perception, word recognition, word learning and the acquisition of grammatical inflections. It is suggested that each area demonstrates how linguistic development can be driven by the interaction of general learning mechanisms, highly sensitive to particular statistical regularities in the input, with a richly structured environment which provides the necessary ingredients for the emergence of linguistic representations that support mature language processing. Similar epigenetic principles, guiding the emergence of linguistic structure, apply to all these domains, offering insights into phenomena ranging from the precocity of young infant's sensitivity to speech contrasts to the complexities of the problem facing the young child learning the arabic plural.

  10. Review of L2 Vocabulary Acquisition Studies

    Institute of Scientific and Technical Information of China (English)

    周先军

    2014-01-01

    Vocabulary is important in language and language acquisition, but it did not catch as much attention as it deserved for a long time. In this thesis, I’ll go through changes of vocabulary studied in linguistics and language teaching as well as rise of L2 vocabulary acquisition studies. Several aspects of L2 vocabulary acquisition studies will then be reviewed.Issues that need to be further studied will at last be put forward.

  11. Lexicon acquisition in an interdisciplinary learning context

    Directory of Open Access Journals (Sweden)

    MARIA PAULA SANTOS SOARES DA SILVA LAGO

    2013-12-01

    Full Text Available This paper presents the questions that led to the field research, the theoretical frame, the subsequent methodology, and some of the results and conclusions. One of these conclusions is the need of specific tasks aimed at lexicon acquisition and of interdisciplinary work within that acquisition. Some strategies of minimizing failure and e learning enhancement will also be discussed, as well as the learning results achieved in the strict area of lexicon acquisition.

  12. Review of L2 Vocabulary Acquisition Studies

    Institute of Scientific and Technical Information of China (English)

    周先军

    2014-01-01

    Vocabulary is important in language and language acquisition, but it did not catch as much attention as it deserved for a long time. In this thesis, I’ll go through changes of vocabulary studied in linguistics and language teaching as well as rise of L2 vocabulary acquisition studies. Several aspects of L2 vocabulary acquisition studies will then be reviewed .Issues that need to be further studied will at last be put forward.

  13. On Vocabulary Acquisition by Chinese Learners

    Institute of Scientific and Technical Information of China (English)

    崔莉; 南二丽

    2006-01-01

    It is admitted that vocabulary acquisition, as the smallest unit in English leaning, is the most basic, decisive yet difficult part. Yet vocabulary acquisition has always obsessed and fascinated Chinese learners of English. This paper mainly presents a discussion of English vocabulary acquisition by Chinese learners in the respect of vocabulary size and correct use. Through the analysis of the problems existing in the present vocabulary learning and teaching, author also presents some learning strategies to expand vocabulary size.

  14. Towards a Theory of Language Acquisition

    OpenAIRE

    Kampen, Jacqueline van

    2008-01-01

    "We have seen at the workshop a diversity of measurements and a no less diverse amount of different phenomena. Shared areas were acquisition phenomena in Romance languages and more general: the beginnings for a true theory of language acquisition. I will not attempt to evaluate the various contributions here. All of this must get its time to sink in. Yet, the general point of our endeavors, - the theory of language acquisition -, may be underlined to gain a further outlook"

  15. State transition storyboards: A tool for designing the Goldstone solar system radar data acquisition system user interface software

    Science.gov (United States)

    Howard, S. D.

    1987-01-01

    Effective user interface design in software systems is a complex task that takes place without adequate modeling tools. By combining state transition diagrams and the storyboard technique of filmmakers, State Transition Storyboards were developed to provide a detailed modeling technique for the Goldstone Solar System Radar Data Acquisition System human-machine interface. Illustrations are included with a description of the modeling technique.

  16. 48 CFR 1631.203-70 - Allocation techniques.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 6 2010-10-01 2010-10-01 true Allocation techniques. 1631... PRINCIPLES AND PROCEDURES Contracts With Commercial Organizations 1631.203-70 Allocation techniques. (a... preferred allocation technique is one that shows the consumption of resources in performance of...

  17. 48 CFR 915.404-4-70-7 - Alternative techniques.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 5 2010-10-01 2010-10-01 false Alternative techniques... techniques. (a) Profit or fees to be paid on construction contracts and construction management contracts shall be determined in accordance with the applicable profit/fee technique for such contracts set forth...

  18. Filament Discharge Phenomena in Fingerprint Acquisition by Dielectric Barrier Discharge

    Institute of Scientific and Technical Information of China (English)

    WENG Ming; XU Weijun; LIU Qiang

    2007-01-01

    In this paper, the dielectric barrier discharge fingerprint acquisition technique is introduced. The filament discharge phenomena were observed in the process of fingerprint acquisition. The filament discharge reduced the quality of fingerprint images. Obviously, it was necessary to eliminate streamer discharges in order to get good fingerprint images. The streamer discharge was considered to be the cause of the filament discharge in the experiment. The relationship between the critical electric field and the discharge gap was calculated with the Raether's model of streamer discharge. The calculated results and our experiment proved that it would be difficult for the streamer discharge to occur when the discharge gap was narrow. With a narrow discharge gap, the discharge was homogeneous, and the fingerprint images were clear and large in area. The images obtained in the experiment are very suitable for fingerprint identification as they contain more information.

  19. Data Acquisition Protocol for Determining Embedded Sensitivity Functions.

    Science.gov (United States)

    Meyer, Janette J; Adams, Douglas E; Silvers, Janene

    2016-04-20

    The effectiveness of many structural health monitoring techniques depends on the placement of sensors and the location of input forces. Algorithms for determining optimal sensor and forcing locations typically require data, either simulated or measured, from the damaged structure. Embedded sensitivity functions provide an approach for determining the best available sensor location to detect damage with only data from the healthy structure. In this video and manuscript, the data acquisition procedure and best practices for determining the embedded sensitivity functions of a structure is presented. The frequency response functions used in the calculation of the embedded sensitivity functions are acquired using modal impact testing. Data is acquired and representative results are shown for a residential scale wind turbine blade. Strategies for evaluating the quality of the data being acquired are provided during the demonstration of the data acquisition process.

  20. Geofencing-Based Localization for 3d Data Acquisition Navigation

    Science.gov (United States)

    Nakagawa, M.; Kamio, T.; Yasojima, H.; Kobayashi, T.

    2016-06-01

    Users require navigation for many location-based applications using moving sensors, such as autonomous robot control, mapping route navigation and mobile infrastructure inspection. In indoor environments, indoor positioning systems using GNSSs can provide seamless indoor-outdoor positioning and navigation services. However, instabilities in sensor position data acquisition remain, because the indoor environment is more complex than the outdoor environment. On the other hand, simultaneous localization and mapping processing is better than indoor positioning for measurement accuracy and sensor cost. However, it is not easy to estimate position data from a single viewpoint directly. Based on these technical issues, we focus on geofencing techniques to improve position data acquisition. In this research, we propose a methodology to estimate more stable position or location data using unstable position data based on geofencing in indoor environments. We verify our methodology through experiments in indoor environments.

  1. Precise time synchronization data acquisition with remote systems

    Energy Technology Data Exchange (ETDEWEB)

    Berg, D.E.; Robertson, P.J.

    1998-08-01

    Researchers at the National Wind Technology Center have identified a need to acquire data on the rotor of an operating wind turbine at precisely the same time as other data is acquired on the ground or on a non-rotating part of the wind turbine. The researchers will analyze that combined data with statistical and correlation techniques to clearly establish phase information and loading paths and insights into the structural loading of wind turbines. A data acquisition unit has been developed to acquire the data from the rotating system at precise universal times specified by the user. The unit utilizes commercial data acquisition hardware, spread-spectrum radio modems, and a Global Positioning Satellite receiver as well as a custom-built programmable logic device. A prototype of the system is now operational, and initial field deployment is anticipated this summer.

  2. Consumption Skill Acquisition in Ski Schools

    DEFF Research Database (Denmark)

    Woermann, Niklas; Wieser, Verena

    2016-01-01

    Remedying the absence of a cultural theory of consumption skill acquisition, we use video data to explore how consumers learn in ski schools. We identify six modes of skill acquisition and theorize the interplay between the sensori-motor system, the conscious state of skillful coping, and the soc......Remedying the absence of a cultural theory of consumption skill acquisition, we use video data to explore how consumers learn in ski schools. We identify six modes of skill acquisition and theorize the interplay between the sensori-motor system, the conscious state of skillful coping...

  3. IT Consultants in Acquisition IT Integration

    DEFF Research Database (Denmark)

    Henningsson, Stefan; Øhrgaard, Christian

    2016-01-01

    ’s IT following a corporate acquisition, presents a difficult but crucial IT challenge for the many acquiring organizations. Through a comparative case study of four acquirers, theoretically grounded in the resource-based view of the firm, it is analyzed how acquirers draw on external consultants to realize...... model, depicting the use of external consultants in acquisition IT integration, contributes to the literature on acquisition IT integration by providing an explanation for IT-based value creation in acquisition that is rooted in the external of the acquirer. In addition to adding to the limited...

  4. JIEDDO Experience Provides Rapid Acquisition Insights

    National Research Council Canada - National Science Library

    James P Craft

    2015-01-01

    .... JIDA's rapid acquisition capabilities were preserved by transitioning the expedient organization that received supplemental funding into the Defense Department's newest combat support agency (CSA...

  5. Pragmatic Transfer in Second Language Acquisition

    Institute of Scientific and Technical Information of China (English)

    李婷

    2011-01-01

    Pragmatic.transfer is a common phenomenon that exists in Second Language Acquisition. It is an increasingly important .research of interlanguage pragmatics in the last two decades. Based on the characteristics , it plays an important role in the success of cultural communication and Second Language Acquisition. Based on presenting the concept of pragmatic transfer, this paper presents the concept of pragmatic transfer in second language acquisition and introduces the classification of pragmatic transfer. Then, this paper proposes some suggestions to avoid negative pragmatic transfer in second language acquisition. It is hoped that this paper can help second language learners to develop their communicative competence and avoid pragmatic failures in intercultural communication.

  6. Emerging Market Firms’ Acquisitions in Advanced Markets

    DEFF Research Database (Denmark)

    Stucchi, Tamara

    2012-01-01

    This study draws upon the resource-based view and the institution-based view of the firm to provide a comprehensive overview of how different resource-, institution- and industry-based antecedents affect the motivations guiding the acquisitions that emerging market firms undertake in advanced...... markets. These antecedents can influence emerging market firms’ capacities to absorb or exploit technological and/or marketing advantages in advanced markets. In order to be successful, emerging market firms have to undertake those upmarket acquisitions that best “fit” their antecedents. Four mutually...... exclusive acquisition strategies are derived, which are then illustrated using examples of Indian firms’ acquisitions in advanced markets....

  7. Acquisition in different and special subject areas

    CERN Document Server

    Katz, Linda S

    2013-01-01

    Learn how acquisitions librarians successfully serve specialized users! In this book, you'll find profiles, methods, and processes for acquisitions in specialized subject areas, such as local and regional poetry, oceanography, educational information in electronic formats, popular fiction, regional and ethnic materials, and more. Seasoned acquisitions librarians share their experiences in gathering the hard-to-find materials their libraries' highly specialized clients need to access. You'll also examine issues surrounding the acquisition of new reference tools that are vital in today's emergi

  8. Learning the manifold of quality ultrasound acquisition.

    Science.gov (United States)

    El-Zehiry, Noha; Yan, Michelle; Good, Sara; Fang, Tong; Zhou, S Kevin; Grady, Leo

    2013-01-01

    Ultrasound acquisition is a challenging task that requires simultaneous adjustment of several acquisition parameters (the depth, the focus, the frequency and its operation mode). If the acquisition parameters are not properly chosen, the resulting image will have a poor quality and will degrade the patient diagnosis and treatment workflow. Several hardware-based systems for autotuning the acquisition parameters have been previously proposed, but these solutions were largely abandoned because they failed to properly account for tissue inhomogeneity and other patient-specific characteristics. Consequently, in routine practice the clinician either uses population-based parameter presets or manually adjusts the acquisition parameters for each patient during the scan. In this paper, we revisit the problem of autotuning the acquisition parameters by taking a completely novel approach and producing a solution based on image analytics. Our solution is inspired by the autofocus capability of conventional digital cameras, but is significantly more challenging because the number of acquisition parameters is large and the determination of "good quality" images is more difficult to assess. Surprisingly, we show that the set of acquisition parameters which produce images that are favored by clinicians comprise a 1D manifold, allowing for a real-time optimization to maximize image quality. We demonstrate our method for acquisition parameter autotuning on several live patients, showing that our system can start with a poor initial set of parameters and automatically optimize the parameters to produce high quality images.

  9. Acquisition Management for System-of-Systems: Requirement Evolution and Acquisition Strategy Planning

    Science.gov (United States)

    2012-04-30

    Director, Office of Acquisition Resources and Analysis ( ARA )  Deputy Assistant Secretary of the Navy, Acquisition & Procurement  Director of Open...geographically distributed, heterogeneous , collaborative systems that demonstrate operational and managerial independences. The collaboration can be

  10. Data acquisition with a positron emission tomograph

    Energy Technology Data Exchange (ETDEWEB)

    Freifelder, R.; Karp, J.S. [Univ. of Pennsylvania, Philadelphia, PA (United States)

    1997-12-31

    Positron Emission Tomography (PET) is a clinical imaging modality used in Nuclear Medicine. PET measures functionality rather than anatomical features and is therefore invaluable in the treatment of diseases which are characterized by functional changes in organs rather than anatomical changes. Typical diseases for which PET is used are cancer, epilepsy, and heart disease. While the scanners are not very complex, the performance demands on the devices are high. Excellent spatial resolution, 4-5 mm, and high sensitivity are key to maintaining high image quality. Compensation or suppression of scattered radiation is also necessary for good image quality. The ability to acquire data under high counting rates is also necessary in order to minimize the injected dose to the patient, minimize the patient`s time in the scanner, and finally to minimize blurring due to patient motion. We have adapted various techniques in our data acquisition system which will be reported on in this talk. These include pulse clipping using lumped delay lines, flash ADCs with short sampling time, the use of a local positioning algorithm to limit the number of data words being used in subsequent second level software triggers and calculations, and finally the use of high speed dedicated calculator boards for on-line rebinning and reduction of the data. Modifications to the system to allow for transmission scanning will also be discussed.

  11. The Acquisition Experiences of Kazoil

    DEFF Research Database (Denmark)

    Minbaeva, Dana; Muratbekova-Touron, Maral

    2016-01-01

    This case describes two diverging post-acquisition experiences of KazOil, an oil drilling company in Kazakhstan, in the years after the dissolution of the Soviet Union. When the company was bought by the Canadian corporation Hydrocarbons Ltd in 1996, exposed to new human resource strategies...... and corporate culture and management style, it seemed to adapt more successfully than in 2005, when China Petrol acquired the assets. The case opens up with Nurlan - a company’s long-time employee - reflecting on the recently introduced changes by the Chinese management, wondering how he should adapt in order...... to ensure employee’s motivation despite the lack of corporate spirit. The case can be taught in a broad range of university level courses, covering the spectrum from pure strategy and human resources management to cross-cultural management courses. The lecturer should use this case to sharpen awareness...

  12. Optimality theory in phonological acquisition.

    Science.gov (United States)

    Barlow, J A; Gierut, J A

    1999-12-01

    This tutorial presents an introduction to the contemporary linguistic framework known as optimality theory (OT). The basic assumptions of this constraint-based theory as a general model of grammar are first outlined, with formal notation being defined and illustrated. Concepts unique to the theory, including "emergence of the unmarked," are also described. OT is then examined more specifically within the context of phonological acquisition. The theory is applied in descriptions of children's common error patterns, observed inter- and intrachild variation, and productive change over time. The particular error patterns of fronting, stopping, final-consonant deletion, and cluster simplification are considered from an OT perspective. The discussion concludes with potential clinical applications and extensions of the theory to the diagnosis and treatment of children with functional phonological disorders.

  13. Language acquisition is language change.

    Science.gov (United States)

    Crain, Stephen; Goro, Takuya; Thornton, Rosalind

    2006-01-01

    According to the theory of Universal Grammar, the primary linguistic data guides children through an innately specified space of hypotheses. On this view, similarities between child-English and adult-German are as unsurprising as similarities between cousins who have never met. By contrast, experience-based approaches to language acquisition contend that child language matches the input, with nonadult forms being simply less articulated versions of the forms produced by adults. This paper reports several studies that provide support for the theory of Universal grammar, and resist explanation on experience-based accounts. Two studies investigate English-speaking children's productions, and a third examines the interpretation of sentences by Japanese speaking children. When considered against the input children are exposed to, the findings of these and other studies are consistent with the continuity hypothesis, which supposes that child language can differ from the language spoken by adults only in ways that adult languages can differ from each other.

  14. Early passive acquisition in Inuktitut.

    Science.gov (United States)

    Allen, S E; Crago, M B

    1996-02-01

    Passive structures are typically assumed to be one of the later acquired constructions in child language. English-speaking children have been shown to produce and comprehend their first simple passive structures productively by about age four and to master more complex structures by about age nine. Recent crosslinguistic data have shown that this pattern may not hold across languages of varying structures. This paper presents data from four Inuit children aged 2;0 to 3;6 that shows relatively early acquisition of both simple and complex forms of the passive. Within this age range children are productively producing truncated, full, action and experiential passives. Some possible reasons for this precociousness are explored including adult input and language structure.

  15. CEBAF Distributed Data Acquisition System

    CERN Document Server

    Allison, Trent

    2005-01-01

    There are thousands of signals distributed throughout Jefferson Lab's Continuous Electron Beam Accelerator Facility (CEBAF) that are useful for troubleshooting and identifying instabilities. Many of these signals are only available locally or monitored by systems with small bandwidths that cannot identify fast transients. The Distributed Data Acquisition (Dist DAQ) system will sample and record these signals simultaneously at rates up to 40 Msps. Its primary function will be to provide waveform records from signals throughout CEBAF to the Experimental Physics and Industrial Control System (EPICS). The waveforms will be collected after the occurrence of an event trigger. These triggers will be derived from signals such as periodic timers or accelerator faults. The waveform data can then be processed to quickly identify beam transport issues, thus reducing down time and increasing CEBAF performance. The Dist DAQ system will be comprised of multiple standalone chassis distributed throughout CEBAF. They will be i...

  16. MOTIVATION IN FOREIGN LANGUAGE ACQUISITION

    Directory of Open Access Journals (Sweden)

    Laura BASEL

    2015-11-01

    Full Text Available This article deals with the problem of Foreign Language Acquisition and the role of a teacher in achieving the goal. The main attention is given to Motivation and strategies to foster students to study the language in enjoyable and productive way.MOTIVAREA ÎN ACHIZIŢIA UNEI LIMBI STRĂINE În articol este abordată problema privind însuşirea unei limbi străine şi rolul unui profesor în atingerea obiectivu-lui respectiv. Atenţia principală este acordată motivaţiei şi strategiilor de încurajare a studenţilor să studieze limba în mod plăcut şi productiv.

  17. Electric vehicle data acquisition system

    DEFF Research Database (Denmark)

    Svendsen, Mathias; Winther-Jensen, Mads; Pedersen, Anders Bro

    2014-01-01

    A data acquisition system for electric vehicles is presented. The system connects to the On-board Diagnostic port of newer vehicles, and utilizes the in-vehicle sensor network, as well as auxiliary sensors, to gather data. Data is transmitted continuously to a central database for academic...... and industrial applications, e.g. research in electric vehicle driving patterns, vehicle substitutability analysis and fleet management. The platform is based on a embedded computer running Linux, and features a high level of modularity and flexibility. The system operates independently of the make of the car......, by using the On-board Diagnostic port to identify car model and adapt its software accordingly. By utilizing on-board Global Navigation Satellite System, General Packet Radio Service, accelerometer, gyroscope and magnetometer, the system not only provides valuable data for research in the field of electric...

  18. Space Acquisitions: Challenges Facing DOD as it Changes Approaches to Space Acquisitions

    Science.gov (United States)

    2016-03-09

    management and development issues. • Third , leadership for space acquisitions is still fragmented, which will likely hamper the implementation of new... Third , leadership for space acquisitions is still fragmented, which may hamper the implementation of changes, especially those that stretch across... acquisition processes and acquisition oversight. In September 2015, we began a review based on language in the Senate Report accompanying a bill for the

  19. The Status of Functional Categories in Child Second Language Acquisition: Evidence from the Acquisition of CP.

    Science.gov (United States)

    Haznedar, Belma

    2003-01-01

    Examines the status of the functional categories in child second language (L2) acquisition of English. Results from longitudinally-collected data are reported, presenting counterevidence for recent hypotheses on early L2 acquisition that assume the following: (1) structure building approach according to which the acquisition of functional…

  20. 78 FR 13544 - Defense Federal Acquisition Regulation Supplement: Acquisition of Tents and Other Temporary...

    Science.gov (United States)

    2013-02-28

    ... Acquisition Regulation Supplement: Acquisition of Tents and Other Temporary Structures (DFARS Case 2012-D015... the National Defense Authorization Act for Fiscal Year 2012 that address the acquisition of tents and... contracts that provide the best value, when acquiring tents and other temporary structures, regardless...

  1. 75 FR 8272 - Defense Federal Acquisition Regulation Supplement; Acquisition Strategies To Ensure Competition...

    Science.gov (United States)

    2010-02-24

    ... Regulation Supplement; Acquisition Strategies To Ensure Competition Throughout the Life Cycle of Major... Reform Act of 2009, section 202, Acquisition Strategies to Ensure Competition throughout the Lifecycle of... requirements. Section 202 directs the Secretary of Defense (SECDEF) to ensure that the acquisition strategy...

  2. 77 FR 19975 - VA Acquisition Regulation: Simplified Acquisition Procedures for Health-Care Resources (Section...

    Science.gov (United States)

    2012-04-03

    ... acquisition of health-care resources, consisting of commercial services or the use of medical equipment or... Service (003A2A), Office of Acquisition, Logistics and Construction, Department of Veterans Affairs, 810... rule only applies to competitive acquisitions of commercial services or the use of medical equipment...

  3. 76 FR 44293 - Defense Acquisition Regulations System; Defense Federal Acquisition Regulation Supplement; Only...

    Science.gov (United States)

    2011-07-25

    ... presented by the Under Secretary of Defense for Acquisition, Technology, & Logistics in a memorandum dated... offered price. These provisions must also be used in acquisitions of commercial items conducted using part...--ACQUISITION OF COMMERCIAL ITEMS 4. Add new section 212.205 to read as follows: 212.205 Offers. (c) When...

  4. Instrumentation and data acquisition electronics for free-flight drop model testing

    Science.gov (United States)

    Carraway, Preston I., III

    1988-01-01

    This paper presents instrumentation and data acquisition electronics techniques used in free-flight drop model testing at the NASA Langley Research Center. Free-flight drop model testing is a technique for conducting complex aircraft controls research using reduced scale models of experimental aircraft. An introduction to the Free-Flight Drop Model Program is presented first. This is followed by a description of the recently upgraded airborne and ground based instrumentation and data acquisition electronics. Lastly current and future development efforts and opportunities are discussed.

  5. Semantics driven approach for knowledge acquisition from EMRs.

    Science.gov (United States)

    Perera, Sujan; Henson, Cory; Thirunarayan, Krishnaprasad; Sheth, Amit; Nair, Suhas

    2014-03-01

    Semantic computing technologies have matured to be applicable to many critical domains such as national security, life sciences, and health care. However, the key to their success is the availability of a rich domain knowledge base. The creation and refinement of domain knowledge bases pose difficult challenges. The existing knowledge bases in the health care domain are rich in taxonomic relationships, but they lack nontaxonomic (domain) relationships. In this paper, we describe a semiautomatic technique for enriching existing domain knowledge bases with causal relationships gleaned from Electronic Medical Records (EMR) data. We determine missing causal relationships between domain concepts by validating domain knowledge against EMR data sources and leveraging semantic-based techniques to derive plausible relationships that can rectify knowledge gaps. Our evaluation demonstrates that semantic techniques can be employed to improve the efficiency of knowledge acquisition.

  6. 16 CFR 801.4 - Secondary acquisitions.

    Science.gov (United States)

    2010-01-01

    ... corporation. B's voting securities are cancelled, and B's shareholders are to receive cash in return. Since S... acquired, by virtue of § 801.2(d)(2) “A” is an acquiring person only. The acquisition of the minority... thereby gains control of that subsidiary, B will make secondary acquisitions of any minority holdings...

  7. The Acquisition of L2 Phonology

    Science.gov (United States)

    Wojtaszek, Adam; Arabski, Janusz

    2011-01-01

    The Acquisition of L2 Phonology is a wide-ranging new collection which focuses on various aspects of the acquisition of an L2 phonological system. The authors are researchers and practitioners from five different countries. The volume has been divided into three major sections. Phonetic Analysis presents five studies of language learners in both…

  8. Towards a Theory of Language Acquisition

    NARCIS (Netherlands)

    Kampen, Jacqueline van

    2008-01-01

    "We have seen at the workshop a diversity of measurements and a no less diverse amount of different phenomena. Shared areas were acquisition phenomena in Romance languages and more general: the beginnings for a true theory of language acquisition. I will not attempt to evaluate the various contribut

  9. Child Language Acquisition: Contrasting Theoretical Approaches

    Science.gov (United States)

    Ambridge, Ben; Lieven, Elena V. M.

    2011-01-01

    Is children's language acquisition based on innate linguistic structures or built from cognitive and communicative skills? This book summarises the major theoretical debates in all of the core domains of child language acquisition research (phonology, word-learning, inflectional morphology, syntax and binding) and includes a complete introduction…

  10. Multilingual Language Acquisition in Canada and Germany.

    Science.gov (United States)

    Hufeisen, Britta

    1995-01-01

    Examines multilingual settings in Canada and Germany and explores the differentiation between second- and third-language acquisition as well as the differentiation between acquisition and learning. The article outlines priority areas for further research and presents the prospects for a greater recognition of multilingualism as a resource in…

  11. Data-Acquisition Systems for Fusion Devices

    NARCIS (Netherlands)

    van Haren, P. C.; Oomens, N. A.

    1993-01-01

    During the last two decades, computerized data acquisition systems (DASs) have been applied at magnetic confinement fusion devices. Present-day data acquisition is done by means of distributed computer systems and transient recorders in CAMAC systems. The development of DASs has been technology driv

  12. The Acquisition of English Pronunciation: Learners' Views.

    Science.gov (United States)

    Cenoz, Jasone; Lecumberri, Ma Luisa Garcia

    1999-01-01

    Describes English learners' views on the acquisition of the phonetic component of English by focusing on (1) their awareness of the difficulty and importance of English pronunciation, and (2) their beliefs about influential factors in the acquisition of pronunciation and their attitudes towards English accents. Examines differences in phonetic…

  13. The Acquisition of L2 Phonology

    Science.gov (United States)

    Wojtaszek, Adam; Arabski, Janusz

    2011-01-01

    The Acquisition of L2 Phonology is a wide-ranging new collection which focuses on various aspects of the acquisition of an L2 phonological system. The authors are researchers and practitioners from five different countries. The volume has been divided into three major sections. Phonetic Analysis presents five studies of language learners in both…

  14. Managing in a merger and acquisition era.

    Science.gov (United States)

    Holdren, R C

    1990-01-01

    Medical group administrators are quickly learning what big business has known for years-mergers and acquisitions represent a new and powerful option. If this option is to be employed successfully, however, group management has to understand the terms and be prepared well before merger or acquisition talk begins.

  15. EBT data acquisition and analysis system

    Energy Technology Data Exchange (ETDEWEB)

    Burris, R.D.; Greenwood, D.E.; Stanton, J.S.; Geoffroy, K.A.

    1980-10-01

    This document describes the design and implementation of a data acquisition and analysis system for the EBT fusion experiment. The system includes data acquisition on five computers, automatic transmission of that data to a large, central data base, and a powerful data retrieval system. The system is flexible and easy to use, and it provides a fully documented record of the experiments.

  16. Distributed multiprotocol acquisition network for environmental data

    Science.gov (United States)

    Barone, Fabrizio; De Rosa, Rosario; Milano, Leopoldo; Qipiani, Ketevan

    2003-03-01

    The acquisition and storage of large amount of data coming from distributed environmental sensors of different kind can be solved with the aid of a network between the acquisition subsystems, but problems can arise if they are not homogeneous. In this case the network should be as flexible as possible to ensure modularity and connectivity. In this work we describe the development and testing of a network based acquisition system. The network uses, where possible, commercial products, based on different standards, in order to increase the availability of its components, as well as its modularity. In addition it is completely independent from proprietary hardware and software products. In particular we tested an acquisition network based on multiple transmission protocol, like wireless and cabled RS232 and Fast Ethernet, which includes the acquisition, archiving and data analysis systems. Each acquisition subsystem can get time from satellite using GPS, and is able to monitor seismic activity, temperature, pressure, humidity and electromagnetic data. The sampling frequency and the dynamics of the acquired data can be matched to the characteristics of each probe. All the acquisition stations can use different platform as well as different operating systems. Tests have been performed to evaluate the capability of long acquisition periods and the fault tolerance of the whole system.

  17. Learning Strategies in Acquisition of Medical Vocabulary

    Institute of Scientific and Technical Information of China (English)

    田俊英; 蒋东坡

    2016-01-01

    Medical vocabulary consists of so many words and terms.Medical students are often terrified by large vocabulary.The paper aimed to analyze the problems lie in acquisition of medical vocabulary,review literature of learning strategies of medical vocabulary,and offers a few simple rules for students to follow to facilitate their acquisition of medical vocabulary.

  18. 40 CFR 35.2210 - Land acquisition.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 1 2010-07-01 2010-07-01 false Land acquisition. 35.2210 Section 35.2210 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY GRANTS AND OTHER FEDERAL ASSISTANCE STATE AND LOCAL ASSISTANCE Grants for Construction of Treatment Works § 35.2210 Land acquisition....

  19. Integration and Reuse in Cognitive Skill Acquisition

    Science.gov (United States)

    Salvucci, Dario D.

    2013-01-01

    Previous accounts of cognitive skill acquisition have demonstrated how procedural knowledge can be obtained and transformed over time into skilled task performance. This article focuses on a complementary aspect of skill acquisition, namely the integration and reuse of previously known component skills. The article posits that, in addition to…

  20. Gerber Technology Announces Acquisition of Yunique Solutions

    Institute of Scientific and Technical Information of China (English)

    2009-01-01

    On Dec.4, 2009, Gerber Technology, announced the strategic acquisition of Yunique Solutions, Inc., developer of the fashion industry’s top-ranked PLM solution. This acquisition will ensure that Gerber provides an innovative end-to-end solution with user productivity and enterprise connectivity at its core.

  1. Leading Nonferrous Enterprises Kicked Off Acquisitions Frequently

    Institute of Scientific and Technical Information of China (English)

    2015-01-01

    The huge adjustment in the stock market since June inadvertently opened another door:In the sluggish nonferrous industry,a number of"long stagnant"asset acquisition projects have kicked off.Recently,Xiamen Tungsten disclosed details of its acquisition of Jiangxi Tungsten assets,

  2. A Three—Stage Knowledge Acquisition Method

    Institute of Scientific and Technical Information of China (English)

    曹存根; 刘薇

    1995-01-01

    This paper presents and analyzes three fundamental problems in knowledge acquisition,and proposes a general method for tackling them.The method divides the whole process of knowledge acquisition into a set of almost independent pieces,each of which can be finished by knowledge engineers,experts and assistants,respectively.

  3. 32 CFR 21.605 - Acquisition.

    Science.gov (United States)

    2010-07-01

    ... 32 National Defense 1 2010-07-01 2010-07-01 false Acquisition. 21.605 Section 21.605 National Defense Department of Defense OFFICE OF THE SECRETARY OF DEFENSE DoD GRANT AND AGREEMENT REGULATIONS DoD GRANTS AND AGREEMENTS-GENERAL MATTERS Definitions § 21.605 Acquisition. The acquiring (by purchase,...

  4. 78 FR 35195 - Acquisition Regulations: Export Control

    Science.gov (United States)

    2013-06-12

    ... Parts 925, 952, and 970 RIN 1991-AB99 Acquisition Regulations: Export Control AGENCY: Department of... amend the Department of Energy Acquisition Regulation (DEAR) to add export control requirements... ``DEAR: Export Control and RIN 1991-AB99,'' by any of the following methods: Federal eRulemaking Portal...

  5. 78 FR 45168 - Acquisition Regulations: Export Control

    Science.gov (United States)

    2013-07-26

    ... Parts 925, 952 and 970 RIN 1991-AB99 Acquisition Regulations: Export Control AGENCY: Department of... Department of Energy Acquisition Regulation (DEAR) to add export control requirements applicable to the... business August 23, 2013. ADDRESSES: You may submit comments, identified by ``DEAR: Export Control and RIN...

  6. Risk Management Programs for Defense Acquisition Systems

    Science.gov (United States)

    2007-11-02

    The audit objective was to evaluate the effectiveness of risk management programs for Defense acquisition systems. Specifically, we determined whether DoD risk management policies and procedures for Defense acquisition systems were effectively implemented and what impact risk management programs bad on reducing program risks and costs. We also reviewed management controls as they applied to the audit objectives.

  7. Programmatic Ahistoricity in Second Language Acquisition Theory.

    Science.gov (United States)

    Thomas, Margaret

    1998-01-01

    Suggests that, despite some perceptions, second language acquisition theory has a history. Disputes arguments that might be formulated to support the notion that second language acquisition theory has no relevant earlier history, enumerates consequences of maintaining this belief, and speculates about benefits to the field that might accrue from…

  8. Input and Intake in Language Acquisition

    Science.gov (United States)

    Gagliardi, Ann C.

    2012-01-01

    This dissertation presents an approach for a productive way forward in the study of language acquisition, sealing the rift between claims of an innate linguistic hypothesis space and powerful domain general statistical inference. This approach breaks language acquisition into its component parts, distinguishing the input in the environment from…

  9. Child Language Acquisition: Contrasting Theoretical Approaches

    Science.gov (United States)

    Ambridge, Ben; Lieven, Elena V. M.

    2011-01-01

    Is children's language acquisition based on innate linguistic structures or built from cognitive and communicative skills? This book summarises the major theoretical debates in all of the core domains of child language acquisition research (phonology, word-learning, inflectional morphology, syntax and binding) and includes a complete introduction…

  10. Second Language Acquisition and Universal Grammar.

    Science.gov (United States)

    White, Lydia

    1990-01-01

    Discusses the motivation for Universal Grammar (UG), as assumed in the principles and parameters framework of generative grammar (Chomsky, 1981), focusing on the logical problem of first-language acquisition and the potential role of UG in second-language acquisition. Recent experimental research regarding the second-language status of the…

  11. Studies in First and Second Language Acquisition.

    Science.gov (United States)

    Eckman, Fred R., Ed.; Hastings, Ashley J., Ed.

    Papers presented at a 1977 symposium on language acquisition held at the University of Wisconsin/Milwaukee are included. Contents are as follows: "Assumptions, Methods and Goals in Language Acquisition Research" (Sheldon); "The Mother as LAD: Interaction between Order and Frequency of Parental Input and Child Production"…

  12. Child Second Language Acquisition of Syntax.

    Science.gov (United States)

    Lakshmanan, Usha

    1995-01-01

    Reviews recent research in universal grammar-based child second language acquisition (SLA) research, arguing that child SLA studies can better explore the role of biological factors in language acquisition and strengthen the links between SLA and linguistic theory. (129 references) (MDM)

  13. Input and Intake in Language Acquisition

    Science.gov (United States)

    Gagliardi, Ann C.

    2012-01-01

    This dissertation presents an approach for a productive way forward in the study of language acquisition, sealing the rift between claims of an innate linguistic hypothesis space and powerful domain general statistical inference. This approach breaks language acquisition into its component parts, distinguishing the input in the environment from…

  14. Multilingual Language Acquisition in Canada and Germany.

    Science.gov (United States)

    Hufeisen, Britta

    1995-01-01

    Examines multilingual settings in Canada and Germany and explores the differentiation between second- and third-language acquisition as well as the differentiation between acquisition and learning. The article outlines priority areas for further research and presents the prospects for a greater recognition of multilingualism as a resource in…

  15. Acquisitions and Real Options : The Greenfield Alternative

    NARCIS (Netherlands)

    Brouthers, Keith D.; Dikova, Desislava

    2010-01-01

    P>Although acquisitions are a popular way to enter new markets, empirical evidence tends to indicate few benefits accrue to acquiring firms. This might be the case because firms use acquisitions when they should be employing an alternative mode of expansion. Applying real options theory to this issu

  16. Acquisition Initiatives Review-Phase 2

    Science.gov (United States)

    2006-02-01

    Actions to Strengthen the TRA Process................................. II-9 III. Improving Acountability in the Acquisition Workforce A. Clear Command...BETTER ACOUNTABILITY IN THE ACQUISITION WORKFORCE In its simplest terms, the Packard Commission recommended that DoD implement an industry model with...evaluation staff. II-10 This page is intentionally left blank. III-1 III. IMPROVING ACOUNTABILITY IN THE

  17. Defense Acquisition Transformation: Report to Congress

    Science.gov (United States)

    2007-07-25

    acquisition and financial databases . The emphasis is on data integrity in a net-centric, authoritative environment and comprehensive, transparent...resources R&E planning documents, financial databases , and other R&E resources Defense Acquisition Management Information Retrieval (DAMIR): Leverages

  18. Webpage Segments Classification with Incremental Knowledge Acquisition

    Science.gov (United States)

    Guo, Wei; Kim, Yang Sok; Kang, Byeong Ho

    This paper suggests an incremental information extraction method for social network analysis of web publications. For this purpose, we employed an incremental knowledge acquisition method, called MCRDR (Multiple Classification Ripple-Down Rules), to classify web page segments. Our experimental results show that our MCRDR-based web page segments classification system successfully supports easy acquisition and maintenance of information extraction rules.

  19. Academic Listening: A Source of Vocabulary Acquisition?

    Science.gov (United States)

    Vidal, Karina

    2003-01-01

    Presents a study of the acquisition of English-as-a-Foreign-Language vocabulary through academic listening. Explored the effects of EFL proficiency and lecture comprehension on vocabulary acquisition as well as the relationship between vocabulary gain and the following factors: frequency of occurrence, types of word, type of word elaboration, and…

  20. Student Modelling for Second Language Acquisition.

    Science.gov (United States)

    Bull, Susan

    1994-01-01

    Describes the student model of an intelligent computer-assisted language learning (CALL) system that is based on current theories in the field of second-language acquisition. Highlights include acquisition order of the target rules; language learning strategies; language transfer; language awareness; and student reactions. (Contains seven…

  1. Application of Krashen's L2 Acquisition Hypothesis

    Institute of Scientific and Technical Information of China (English)

    范丽

    2008-01-01

    In the search for better approaches to teaching in China,Krashen's second language acquisition theory comes into their sight.In this essay some problems with existing teaching practice are first of all listed.Then Krmhen's second language acquisition theories are introduced.In the third part,a detailed instruction of the theory is given.

  2. Acquisition Cycle Time: Defining the Problem

    Science.gov (United States)

    2016-04-01

    prescribe appetite suppression and fiscal discipline . Still others diagnose inept management and excessive bureaucracy, and prescribe streamlined...complex the system, the higher this bound. • Software development consists of completing known work and discovering new work. There are fundamental ... taxonomy of acquisition risk categories, with corresponding development timelines. In that report, a low-risk acquisition is defined to be one that

  3. Risks of Mergers and Acquisitions Processes

    Directory of Open Access Journals (Sweden)

    Skitsko Volodymyr I.

    2017-06-01

    Full Text Available Despite structural changes both in the economies of individual countries and in the world at large, the size of the merger/acquisition market is not declining and is tending to grow further. However, uncertainty in the global environment increases the importance of proper analysis, assessment and risk management in merger/acquisition transactions. Using the relevant research and publications by various authors, we have built a general ranking of the significance of merger and acquisition risks according to phases of the indicated process, with comparison of individual risk ratings, based on the publications by authors from Central and Eastern Europe and other countries around the world. The ranking of risks and threats of mergers/acquisitions proposed in this work can be considered one of the most complete for today. Further research needs to focus on the analysis, evaluation, and modeling of merger/acquisition risks, which occupy the top of the ranking, presented by the article.

  4. Reinventing the Platform Core Through Acquisition

    DEFF Research Database (Denmark)

    Toppenberg, Gustav; Henningsson, Stefan; Eaton, Ben

    2016-01-01

    Digital platform leaders need to continuously innovate the platform core to drive the technological trajectory of the overall architecture and business system, of which the platform is a core element. This papers analyses the potential of and challenges to completing this task through...... the acquisition and integration of companies presenting innovative technologies of relevance to the platform core. Using a revelatory case study of Cisco Systems, we develop the explanatory notion of ‘coring acquisition’. In this type of acquisition value is created through the acquisition of companies...... that provide products external to the acquirer that can be assimilated into the platform core. This creates value through the transformational process that we term ‘coring’. We also analyze how the benefits of coring acquisitions are contingent on challenges concerning the integration of acquisitions offering...

  5. Antecedents of Cross-Border Acquisition Performance

    DEFF Research Database (Denmark)

    Wang, Daojuan; Moini, Hamid; Kuada, John Ernest

    2017-01-01

    This study investigates the impacts of main implementation activities on the success of cross-border acquisitions (CBAs), using survey data from a sample of 103 CBAs conducted by the companies in Nordic countries. The results of OLS regression analysis indicate that due diligence, integration...... impact on the success, while acquisition experience exerts negative effect. However, the evidence does not support that planning and coordination will contribute to CBA performance. Taking a process perspective, this study specially focuses on the main implementation activities during acquisition process......, with the aim to empirically investigate their relative importance and joint effect on the performance of cross-border acquisitions. Such integrative understanding of how and why these actions explain acquisition success also yields important implications for managers....

  6. 48 CFR 908.7101-3 - Direct acquisition.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 5 2010-10-01 2010-10-01 false Direct acquisition. 908.7101-3 Section 908.7101-3 Federal Acquisition Regulations System DEPARTMENT OF ENERGY COMPETITION ACQUISITION PLANNING REQUIRED SOURCES OF SUPPLIES AND SERVICES Acquisition of Special Items 908.7101-3...

  7. 48 CFR 208.7003-2 - Assignments under coordinated acquisition.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 3 2010-10-01 2010-10-01 false Assignments under coordinated acquisition. 208.7003-2 Section 208.7003-2 Federal Acquisition Regulations System DEFENSE ACQUISITION REGULATIONS SYSTEM, DEPARTMENT OF DEFENSE ACQUISITION PLANNING REQUIRED SOURCES OF SUPPLIES...

  8. 14 CFR 151.59 - Grant payments: Land acquisition.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 3 2010-01-01 2010-01-01 false Grant payments: Land acquisition. 151.59... Grant payments: Land acquisition. If an approved project includes land acquisition as an item of airport... costs of the acquisition, including any acquisition that is completed before executing the...

  9. 48 CFR 1825.1101 - Acquisition of supplies.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 6 2010-10-01 2010-10-01 true Acquisition of supplies. 1825.1101 Section 1825.1101 Federal Acquisition Regulations System NATIONAL AERONAUTICS AND SPACE ADMINISTRATION SOCIOECONOMIC PROGRAMS FOREIGN ACQUISITION Solicitation Provisions and Contract Clauses 1825.1101 Acquisition of supplies. (c)(1) NASA...

  10. [CT coronary angiography: indications, image acquisition, and interpretation].

    Science.gov (United States)

    Schoepf, U J; Thilo, C; Fernández, M J; Costello, P

    2008-01-01

    Intense scientific and clinical evaluation have brought about great improvements in cardiac CT. This is no longer merely an experimental technique, rather it has become a clinical application that is ready to fulfill its promise of replacing invasive cardiac catheterization in certain patient populations. Among the proven indications is the evaluation of patients with atypical chest pain, the morphological evaluation of the coronary arteries in cases of suspected congenital anomalies, and before surgical intervention, as well as the evaluation of coronary revascularizations. The use of CT angiography for the exhaustive evaluation of cardiac and non-cardiac pathology in patients with acute chest pain in the emergency department is currently being investigated. Because the heart is continuously moving, CT coronary angiography represents a greater technical challenge than other applications of CT. On the other hand, rapid technical development requires acquisition protocols to be adjusted constantly. However, users that know the general techniques of computed tomography can overcome these challenges. The aim of this article is to provide those interested and involved in CT angiography with a manual to enable them to follow our method step by step. We include considerations regarding the correct selection of patients, patient medication, radiological protection, contrast enhancement, acquisition and reconstruction parameters, image display, image analysis techniques, and the radiological report. Our recommendations are based on our experience, which runs from the evolution of multiple-row detector CT scanners for cardiac applications from its beginnings to the most modern presentations of advanced acquisition modalities, including dual-source CT, which we consider to be the precursor of this test in routine clinical practice.

  11. Rock fracture image acquisition with both visible and ultraviolet illuminations

    Science.gov (United States)

    Wang, Weixing; Hakami, Eva

    2006-02-01

    Swedish Nuclear Fuel and Waste Management Company (SKB) have identified the need for a better understanding of radionuclide transport and retention processes in fractured rock since 1994. In the study, the first hard problem is to obtain rock fracture images of a good quality, since rock surface is very rough, and composed of complicated and multiple fractures, as a result, image acquisition is the first important. As a cooperation project between Sweden and China, we sampled a number of rock specimens for analyzing rock fracture network by visible and ultraviolet image technique, in the field. The samples are resin injected, in which way; opened fractures can be seen clearly by means of UV light illumination, and the rock surface information can be obtained by using visible optical illumination. We used different digital cameras and microscope to take images by two illuminations. From the same samples; we found that UV illumination image gives the clear information of fracture opening or closing, and the visible optical illumination gives the information of the rock surface (e.g. filling materials inside of fractures). By applying this technique, the minimum width of rock fracture 0.01 mm can be analyzed. This paper presents: (1) Rock fracture image acquiring techniques; (2) Rock fracture image acquisition by using UV light illumination and visible optical illumination; and (3) Conclusions. The studied method can be used both in the field and a laboratory.

  12. Mobile field data acquisition in geosciences

    Science.gov (United States)

    Golodoniuc, Pavel; Klump, Jens; Reid, Nathan; Gray, David

    2016-04-01

    The Discovering Australia's Mineral Resources Program of CSIRO is conducting a study to develop novel methods and techniques to reliably define distal footprints of mineral systems under regolith cover in the Capricorn Orogen - the area that lies between two well-known metallogenic provinces of Pilbara and Yilgarn Cratons in Western Australia. The multidisciplinary study goes beyond the boundaries of a specific discipline and aims at developing new methods to integrate heterogeneous datasets to gain insight into the key indicators of mineralisation. The study relies on large regional datasets obtained from previous hydrogeochemical, regolith, and resistate mineral studies around known deposits, as well as new data obtained from the recent field sampling campaigns around areas of interest. With thousands of water, vegetation, rock and soil samples collected over the past years, it has prompted us to look at ways to standardise field sampling procedures and review the data acquisition process. This process has evolved over the years (Golodoniuc et al., 2015; Klump et al., 2015) and has now reached the phase where fast and reliable collection of scientific data in remote areas is possible. The approach is backed by a unified discipline-agnostic platform - the Federated Archaeological Information Management System (FAIMS). FAIMS is an open source framework for mobile field data acquisition, developed at the University of New South Wales for archaeological field data collection. The FAIMS framework can easily be adapted to a diverse range of scenarios, different kinds of samples, each with its own peculiarities, integration with GPS, and the ability to associate photographs taken with the device embedded camera with captured data. Three different modules have been developed so far, dedicated to geochemical water, plant and rock sampling. All modules feature automatic date and position recording, and reproduce the established data recording workflows. The rock sampling

  13. The COMPASS data acquisition system

    CERN Document Server

    Fischer, H; Grünemaier, A; Heinsius, F H; Hoffmann, M; Karstens, F; Kastaun, W; Königsmann, K C; Niebuhr, M; Risken, R; Schmidt, T; Schmitt, H; Schweimler, A; Hodenberg, M V; Urban, H J

    2002-01-01

    A fully pipelined and massively parallel data acquisition system has been developed for the COMPASS experiment at CERN. The main requirements are to read 250000 detector channels at a trigger rate of up to 100 kHz. Such high rates are only possible when using a hit selection mechanism on the front-end combined with dead-time free readout. For this purpose, a time-to-digital converter (TDC) chip has been developed and is used for all time measurement applications in COMPASS. Distributed, field programmable gate array (FPGA)-based readout-driver modules handle parallel front-end initialization, synchronous trigger and control-signal distribution, and local event building at a processing speed of 160 Mbyte/s. Each of the 160 readout-driver modules connects to 16 front-end boards through independent twisted pair cables (CAT 7, 600 MHz) or optical fibers using an industrial (ESCON), self synchronizing link at 40 Mbyte/s. Automatic configuration through unique module and link identification ensures the flexibility ...

  14. Intelligent FPGA Data Acquisition Framework

    Science.gov (United States)

    Bai, Yunpeng; Gaisbauer, Dominic; Huber, Stefan; Konorov, Igor; Levit, Dmytro; Steffen, Dominik; Paul, Stephan

    2017-06-01

    In this paper, we present the field programmable gate arrays (FPGA)-based framework intelligent FPGA data acquisition (IFDAQ), which is used for the development of DAQ systems for detectors in high-energy physics. The framework supports Xilinx FPGA and provides a collection of IP cores written in very high speed integrated circuit hardware description language, which use the common interconnect interface. The IP core library offers functionality required for the development of the full DAQ chain. The library consists of Serializer/Deserializer (SERDES)-based time-to-digital conversion channels, an interface to a multichannel 80-MS/s 10-b analog-digital conversion, data transmission, and synchronization protocol between FPGAs, event builder, and slow control. The functionality is distributed among FPGA modules built in the AMC form factor: front end and data concentrator. This modular design also helps to scale and adapt the DAQ system to the needs of the particular experiment. The first application of the IFDAQ framework is the upgrade of the read-out electronics for the drift chambers and the electromagnetic calorimeters (ECALs) of the COMPASS experiment at CERN. The framework will be presented and discussed in the context of this paper.

  15. CEBAF Distributed Data Acquisition System

    Energy Technology Data Exchange (ETDEWEB)

    Trent Allison; Thomas Powers

    2005-05-01

    There are thousands of signals distributed throughout Jefferson Lab's Continuous Electron Beam Accelerator Facility (CEBAF) that are useful for troubleshooting and identifying instabilities. Many of these signals are only available locally or monitored by systems with small bandwidths that cannot identify fast transients. The Distributed Data Acquisition (Dist DAQ) system will sample and record these signals simultaneously at rates up to 40 Msps. Its primary function will be to provide waveform records from signals throughout CEBAF to the Experimental Physics and Industrial Control System (EPICS). The waveforms will be collected after the occurrence of an event trigger. These triggers will be derived from signals such as periodic timers or accelerator faults. The waveform data can then be processed to quickly identify beam transport issues, thus reducing down time and increasing CEBAF performance. The Dist DAQ system will be comprised of multiple standalone chassis distributed throughout CEBAF. They will be interconnected via a fiber optic network to facilitate the global triggering of events. All of the chassis will also be connected directly to the CEBAF Ethernet and run EPICS locally. This allows for more flexibility than the typical configuration of a single board computer and other custom printed circuit boards (PCB) installed in a card cage.

  16. Acquired Techniques

    DEFF Research Database (Denmark)

    Lunde Nielsen, Espen; Halse, Karianne

    2013-01-01

    Acquired Techniques - a Leap into the Archive, at Aarhus School of Architecture. In collaboration with Karianne Halse, James Martin and Mika K. Friis. Following the footsteps of past travelers this is a journey into tools and techniques of the architectural process. The workshop will focus upon...... architectural production as a conglomerate of various analogue and digital methods, and provide the basics, the tips/tricks - and how the tool themselves becomes operational for spatial/thematic investigations. Eventually, this will become a city, exhibition and phamplet inhabited by the (by...

  17. Generation of High-Quality SWATH(®) Acquisition Data for Label-free Quantitative Proteomics Studies Using TripleTOF(®) Mass Spectrometers.

    Science.gov (United States)

    Schilling, Birgit; Gibson, Bradford W; Hunter, Christie L

    2017-01-01

    Data-independent acquisition is a powerful mass spectrometry technique that enables comprehensive MS and MS/MS analysis of all detectable species, providing an information rich data file that can be mined deeply. Here, we describe how to acquire high-quality SWATH(®) Acquisition data to be used for large quantitative proteomic studies. We specifically focus on using variable sized Q1 windows for acquisition of MS/MS data for generating higher specificity quantitative data.

  18. Embedded systems design for high-speed data acquisition and control

    CERN Document Server

    Di Paolo Emilio, Maurizio

    2015-01-01

    This book serves as a practical guide for practicing engineers who need to design embedded systems for high-speed data acquisition and control systems. A minimum amount of theory is presented, along with a review of analog and digital electronics, followed by detailed explanations of essential topics in hardware design and software development. The discussion of hardware focuses on microcontroller design (ARM microcontrollers and FPGAs), techniques of embedded design, high speed data acquisition (DAQ) and control systems. Coverage of software development includes main programming techniques, culminating in the study of real-time operating systems. All concepts are introduced in a manner to be highly-accessible to practicing engineers and lead to the practical implementation of an embedded board that can be used in various industrial fields as a control system and high speed data acquisition system.   • Describes fundamentals of embedded systems design in an accessible manner; • Takes a problem-solving ...

  19. Development and testing of neutron pulse time stamping data acquisition system for neutron noise experiment

    Energy Technology Data Exchange (ETDEWEB)

    Kumar, Rajeev [Reactor Physics Design Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400085 (India); Yakub Ali, M [Radio Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400085 (India); Degweker, S.B. [Theoretical Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400085 (India); Vishwasrao, S.C. [Product Development Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400085 (India); Jadhav, R.T. [Radio Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400085 (India)

    2015-01-11

    Statistical correlation techniques find applications in the analysis of zero power reactor noise and in passive neutron assay (PNA). A large number of apparently different techniques have been in use in these application areas and traditionally the electronics modules used for data acquisition and analysis is specific to the method used. In this paper we describe a data acquisition scheme developed by us, which is independent of the specific analysis method and can therefore be used for all of them. This is a neutron time stamping data acquisition system based on a timer card and an interface software to acquire and store the data in the required format. The system has been successfully tested with two statistically different types of neutron sources, namely a random Poisson source (Pu–Be) and a correlated source (a nuclear reactor)

  20. Translation Techniques

    Directory of Open Access Journals (Sweden)

    Marcia Pinheiro

    2015-05-01

    Full Text Available In this paper, we discuss three translation techniques: literal, cultural, and artistic. Literal translation is a well-known technique, which means that it is quite easy to find sources on the topic. Cultural and artistic translation may be new terms. Whilst cultural translation focuses on matching contexts, artistic translation focuses on matching reactions. Because literal translation matches only words, it is not hard to find situations in which we should not use this technique.  Because artistic translation focuses on reactions, judging the quality of an artistic translation work is one of the most difficult things one can do. We end up having a score of complexity and humanity for each one of the mentioned techniques: Literal translation would be the closest thing we have to the machines world and artistic translation would be the closest thing we have to the purely human world. By creating these classifications and studying the subtleties of each one of them, we are adding degrees of quality to our courses and to translation as a professional field. The main contribution of this paper is then the formalization of such a piece of knowledge. We, however, also lay the foundations for studies of this type.

  1. Experimental Techniques

    CERN Document Server

    Engelfried, J

    1999-01-01

    In this course we will give examples for experimental techniques used in particle physics experiments. After a short introduction, we will discuss applications in silicon microstrip detectors, wire chambers, and single photon detection in Ring Imaging Cherenkov (RICH) counters. A short discussion of the relevant physics processes, mainly different forms of energy loss in matter, is enclosed.

  2. Acquisition of speech rhythm in first language.

    Science.gov (United States)

    Polyanskaya, Leona; Ordin, Mikhail

    2015-09-01

    Analysis of English rhythm in speech produced by children and adults revealed that speech rhythm becomes increasingly more stress-timed as language acquisition progresses. Children reach the adult-like target by 11 to 12 years. The employed speech elicitation paradigm ensured that the sentences produced by adults and children at different ages were comparable in terms of lexical content, segmental composition, and phonotactic complexity. Detected differences between child and adult rhythm and between rhythm in child speech at various ages cannot be attributed to acquisition of phonotactic language features or vocabulary, and indicate the development of language-specific phonetic timing in the course of acquisition.

  3. SSC/BCD data acquisition system proposal

    Energy Technology Data Exchange (ETDEWEB)

    Barsotti, E.; Bowden, M.; Swoboda, C. [Fermilab, Batavia, IL (United States)

    1989-04-01

    The proposed new data acquisition system architecture takes event fragments off a detector over fiber optics and to a parallel event building switch. The parallel event building switch concept, taken from the telephone communications industry, along with expected technology improvements in fiber-optic data transmission speeds over the next few years, should allow data acquisition system rates to increase dramatically and exceed those rates needed for the SSC. This report briefly describes the switch architecture and fiber optics for a SSC data acquisition system.

  4. Foreign acquisition, plant survival, and employment growth

    DEFF Research Database (Denmark)

    Bandick, Roger; Görg, Holger

    This paper analyses the effect of foreign acquisition on survival probability and employment growth of target plant using data on Swedish manufacturing plants during the period 1993-2002.  An improvement over previous studies is that we take into account firm level heterogeneity by separating...... the targeted plants into those within Swedish MNEs, Swedish exporting non-MNEs, and purely domestic firms before foreign takeover. The results, controlling for possible endogeneity of the acquisition dummy using an IV and propensity score matching approach suggest that acquisition by foreign owners increases...

  5. IT-based Value Creation in Serial Acquisitions

    DEFF Research Database (Denmark)

    Henningsson, Stefan; Yetton, Philip

    2013-01-01

    The extant research on post-acquisition IT integration analyzes how acquirers realize IT-based value in individual acquisitions. However, serial acquirers make 60% of acquisitions. These acquisitions are not isolated events, but are components in growth-by-acquisition programs. To explain how...... serial acquirers realize IT-based value, we integrate and model the findings on individual acquisitions from the extant literature, and extend that model to explain the effects of sequential acquisitions in a growth-by-acquisition strategy. This extended model, drawing on the Resource-Based Theory...

  6. Manganese acquisition by Lactobacillus plantarum

    Energy Technology Data Exchange (ETDEWEB)

    Archibald, F.S.; Duong, M.N.

    1984-04-01

    Lactobacillus plantarum has an unusually high Mn(II) requirement for growth and accumulated over 30 mM intracellular Mn(II). The acquisition of Mn(II) by L. plantarum occurred via a specific active transport system powered by the transmembrane proton gradient. The Mn(II) uptake system has a K/sub m/ of 0.2 ..mu..M and a V/sub max/ of 24 nmol mg/sup -1/ of protein min/sup -1/. Above a medium Mn(II) concentration of 200 ..mu..M, the intracellular Mn(II) level was independent of the medium Mn(II) and unresponsive to oxygen stresses but was reduced by phosphate limitation. At a pH of 5.5, citrate, isocitrate, and cis-aconitate effectively promoted MN(II) uptake, although measurable levels of 1,5-(/sup 14/C)citrate were not accumulated. When cells were presented with equimolar Mn(II) and Cd(II), Cd(II) was preferentially taken up by the Mn(II) transport system. Both Mn(II) and Cd(II) uptake were greatly increased by Mn(II) starvation. Mn(II) uptake by Mn(II)-starved cells was subject to a negative feedback regulatory mechanism functioning less than 1 min after exposure of the cells to Mn(II) and independent of protein synthesis. When presented with a relatively large amount of exogenous Mn(II), Mn(II)-starved cells exhibited a measurable efflux of their internal Mn(II), but the rate was only a small fraction of the maximal Mn(II) uptake rate.

  7. Raman Imaging Techniques and Applications

    CERN Document Server

    2012-01-01

    Raman imaging has long been used to probe the chemical nature of a sample, providing information on molecular orientation, symmetry and structure with sub-micron spatial resolution. Recent technical developments have pushed the limits of micro-Raman microscopy, enabling the acquisition of Raman spectra with unprecedented speed, and opening a pathway to fast chemical imaging for many applications from material science and semiconductors to pharmaceutical drug development and cell biology, and even art and forensic science. The promise of tip-enhanced raman spectroscopy (TERS) and near-field techniques is pushing the envelope even further by breaking the limit of diffraction and enabling nano-Raman microscopy.

  8. Intensity techniques

    DEFF Research Database (Denmark)

    Jacobsen, Finn

    2008-01-01

    The Handbook of Signal Processing in Acoustics will compile the techniques and applications of signal processing as they are used in the many varied areas of Acoustics. The Handbook will emphasize the interdisciplinary nature of signal processing in acoustics. Each Section of the Handbook...... will present topics on signal processing which are important in a specific area of acoustics. These will be of interest to specialists in these areas because they will be presented from their technical perspective, rather than a generic engineering approach to signal processing. Non-specialists, or specialists...... from different areas, will find the self-contained chapters accessible and will be interested in the similarities and differences between the approaches and techniques used in different areas of acoustics....

  9. LWIR hyperspectral change detection for target acquisition and situation awareness in urban areas

    NARCIS (Netherlands)

    Dekker, R.J.; Schwering, P.B.W.; Benoist, K.W.; Pignatti, S.; Santini, F.; Friman, O.

    2013-01-01

    This paper studies change detection of LWIR (Long Wave Infrared) hyperspectral imagery. Goal is to improve target acquisition and situation awareness in urban areas with respect to conventional techniques. Hyperspectral and conventional broadband high-spatial-resolution data were collected during th

  10. A System for English Vocabulary Acquisition Based on Code-Switching

    Science.gov (United States)

    Mazur, Michal; Karolczak, Krzysztof; Rzepka, Rafal; Araki, Kenji

    2016-01-01

    Vocabulary plays an important part in second language learning and there are many existing techniques to facilitate word acquisition. One of these methods is code-switching, or mixing the vocabulary of two languages in one sentence. In this paper the authors propose an experimental system for computer-assisted English vocabulary learning in…

  11. Scaling Tennis Racquets During PE in Primary School to Enhance Motor Skill Acquisition.

    Science.gov (United States)

    Buszard, Tim; Reid, Machar; Masters, Rich S W; Farrow, Damian

    2016-12-01

    Research supporting the skill acquisition benefits of scaling sports equipment for children in a real-world setting where child-to-coach ratios are high is scarce. Thus, the aim of this study was to examine the influence of scaling the tennis racquet on children's skill acquisition in a primary school setting. Children aged 6 to 7 years old practiced for 5 weeks during physical education classes using either a small racquet (SR group; n = 23) or a large racquet (LR group; n = 23). Measures of hitting technique, hitting performance, and general hand-eye coordination were administered before and after the practice period. The high child-to-coach ratio (22:2) seemingly led to a small number of practice opportunities for children. Despite this finding, children in the SR group displayed greater improvements in hitting technique for the forehand and backhand. This finding did not translate to better hitting performance (i.e., skill outcome), however, with similar results found for both groups during the pretest and posttest. Conversely, the LR group showed greater improvements in the hand-eye coordination measure of bouncing the ball on the ground. Scaling equipment for children enhanced the acquisition of a more desirable technique in a real-world setting. We speculate that this technique acquisition would also lead to improved hitting performance following a longer practice period, whereby children are exposed to more practice opportunities.

  12. The Acquisition of Japanese Numeral Classifiers: Linkage between Grammatical Forms and Conceptual Categories.

    Science.gov (United States)

    Yamamoto, Kasumi; Keil, Frank

    2000-01-01

    Examines the acquisition of Japanese numeral classifiers in Japanese preschool children, with a primary emphasis on developing comprehension ability. Argues that different techniques and stimulus contrast sets reveal a much greater sensitivity to semantic relations in young children than was previously considered possible. (Author/VWL)

  13. Match filtering approach for signal acquisition in radio-pulsar navigation

    NARCIS (Netherlands)

    Heusdens, R.; Engelen, S.; Buist, P.J.; Noroozi, A.; Sundaramoorthy, P.P.; Verhoeven, C.J.M.; Bentum, M.; Gill, E.K.A.

    2012-01-01

    Pulsars with their periodic pulses and known positions are ideal beacons for navigation. The challenge, however, is the detection of the very weak pulsar signals that are submerged in noise. Radio based approaches allow the use of advanced techniques and methods for the detection and acquisition of

  14. Generative Research on Second Language Acquisition.

    Science.gov (United States)

    Eubank, Lynn

    1995-01-01

    Reviews recent trends in generative research on second language acquisition, focusing on the role of universal grammar, parameter resetting, and anaphoric binding. An annotated bibliography discusses five important works in the field. (61 references) (MDM)

  15. Low Cost Data Acquisition System for Students

    Directory of Open Access Journals (Sweden)

    Sachin Sharma Gaurav Kumar

    2011-12-01

    Full Text Available Today the engineering education in India is increasing, so the demand of quality projects and quality research at the students level is also increasing. To make good hardware projects most of the time we need to acquire real time data. This acquisition is done through the dedicated device which is called Data Acquisition Device. In India there are very less no. of companies which are making the Data Acquisition Devices and the available devices are very costly for the students. Hence, there is need to provide students a cost effective or low cost device which can suite according to their proposed work. In this paper we have designed and implemented a prototype of Data Acquisition Device (DAQ using AVR microcontroller. The software for the DAQ device has been mode on MATLAB and LabView and the device has been tested for different tasks and under different conditions

  16. Acoustic window planning for ultrasound acquisition.

    Science.gov (United States)

    Göbl, Rüdiger; Virga, Salvatore; Rackerseder, Julia; Frisch, Benjamin; Navab, Nassir; Hennersperger, Christoph

    2017-03-11

    Autonomous robotic ultrasound has recently gained considerable interest, especially for collaborative applications. Existing methods for acquisition trajectory planning are solely based on geometrical considerations, such as the pose of the transducer with respect to the patient surface.

  17. 75 FR 10567 - Commerce Acquisition Regulation (CAR)

    Science.gov (United States)

    2010-03-08

    ... acquisitions, research and development contracting, security processing, value engineering, and termination of..., Terms. 48 CFR Part 1303 Antitrust, Conflict of interests, Ethical conduct, Government procurement... Affirmative procurement program, Air pollution control, Drug abuse, Drug-free workplace, Energy conservation...

  18. Aircraft Nodal Data Acquisition System (ANDAS) Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Development of an Aircraft Nodal Data Acquisition System (ANDAS) is proposed. The proposed methodology employs the development of a very thin (135m) hybrid...

  19. Mergers and acquisitions: a most strategic decision.

    Science.gov (United States)

    Laine, Mike; Tyler, David

    2007-11-01

    Five steps are basic to successfully concluding (or deciding not to conclude) a merger or acquisition: Identify targets. Begin with the end in mind. Choose a transaction team. Perform due diligence. Commit to the deal--or to no deal.

  20. KNOWLEDGE ACQUISITION AMONG ENGINEERS IN MNCS

    National Research Council Canada - National Science Library

    Fakhrorazi Ahmad; Osman Mohamad; Hazril Izwar Ibrahim

    2013-01-01

      The objective of this paper is to investigate the relationship between individual's absorptive capacity and knowledge acquisition behavior among engineers in the electrical and electronic (E&E) sector in Malaysia...

  1. AcquisitionFootprintAttenuationDrivenbySeismicAttributes

    Directory of Open Access Journals (Sweden)

    Cuellar-Urbano Mayra

    2014-04-01

    Full Text Available Acquisition footprint, one of the major problems that PEMEX faces in seismic imaging, is noise highly correlated to the geometric array of sources and receivers used for onshore and offshore seismic acquisitions. It prevails in spite of measures taken during acquisition and data processing. This pattern, throughout the image, is easily confused with geological features and misguides seismic attribute computation. In this work, we use seismic data from PEMEX Exploración y Producción to show the conditioning process for removing random and coherent noise using linear filters. Geometric attributes used in a workflow were computed for obtaining an acquisition footprint noise model and adaptively subtract it from the seismic data.

  2. Technological Integration of Acquisitions in Digital Industries

    DEFF Research Database (Denmark)

    Henningsson, Stefan; Toppenberg, Gustav

    2015-01-01

    challenges in process and product integration. Through a case study of Network Solutions Corp. (NSC), a Fortune 500 company that has acquired more than 175 business units, we develop four propositions explaining how the benefits of platform core and complement acquisitions are differently contingent......Acquisitions have become essential tools to retain the technological edge in digital industries. This paper analyses the technological integration challenges in such acquisitions. Acquirers in digital industries are typically platform leaders in platform markets. They acquire (a) other platform...... providers to extend the platform core and to derive network effects by consolidating platform user groups, and (b) complement providers to create monopoly positions for the complements and for innovation complementarity. To enable these acquisition benefits, acquirers face technological integration...

  3. Aircraft Nodal Data Acquisition System (ANDAS) Project

    Data.gov (United States)

    National Aeronautics and Space Administration — Development of an Aircraft Nodal Data Acquisition System (ANDAS) based upon the short haul Zigbee networking standard is proposed. It employs a very thin (135 um)...

  4. Electrochemical Techniques

    Energy Technology Data Exchange (ETDEWEB)

    Chen, Gang; Lin, Yuehe

    2008-07-20

    Sensitive and selective detection techniques are of crucial importance for capillary electrophoresis (CE), microfluidic chips, and other microfluidic systems. Electrochemical detectors have attracted considerable interest for microfluidic systems with features that include high sensitivity, inherent miniaturization of both the detection and control instrumentation, low cost and power demands, and high compatibility with microfabrication technology. The commonly used electrochemical detectors can be classified into three general modes: conductimetry, potentiometry, and amperometry.

  5. Positron Emission Mammography with Multiple Angle Acquisition

    Energy Technology Data Exchange (ETDEWEB)

    Mark F. Smith; Stan Majewski; Raymond R. Raylman

    2002-11-01

    Positron emission mammography (PEM) of F-18 fluorodeoxyglucose (FbG) uptake in breast tumors with dedicated detectors typically has been accomplished with two planar detectors in a fixed position with the breast under compression. The potential use of PEM imaging at two detector positions to guide stereotactic breast biopsy has motivated us to use PEM coincidence data acquired at two or more detector positions together in a single image reconstruction. Multiple angle PEM acquisition and iterative image reconstruction were investigated using point source and compressed breast phantom acquisitions with 5, 9, 12 and 15 mm diameter spheres and a simulated tumor:background activity concentration ratio of 6:1. Image reconstruction was performed with an iterative MLEM algorithm that used coincidence events between any two detector pixels on opposed detector heads at each detector position. This present study compared two acquisition protocols: 2 angle acquisition with detector angular positions of -15 and +15 degrees and 11 angle acquisition with detector positions spaced at 3 degree increments over the range -15 to +15 degrees. Three-dimensional image resolution was assessed for the point source acquisitions, and contrast and signal-to-noise metrics were evaluated for the compressed breast phantom with different simulated tumor sizes. Radial and tangential resolutions were similar for the two protocols, while normal resolution was better for the 2 angle acquisition. Analysis is complicated by the asymmetric point spread functions. Signal- to-noise vs. contrast tradeoffs were better for 11 angle acquisition for the smallest visible 9 mm sphere, while tradeoff results were mixed for the larger and more easily visible 12 mm and 15 mm diameter spheres. Additional study is needed to better understand the performance of limited angle tomography for PEM. PEM tomography experiments with complete angular sampling are planned.

  6. Positron Emission Mammography with Multiple Angle Acquisition

    Energy Technology Data Exchange (ETDEWEB)

    Mark F. Smith; Stan Majewski; Raymond R. Raylman

    2002-11-01

    Positron emission mammography (PEM) of F-18 fluorodeoxyglucose (FDG) uptake in breast tumors with dedicated detectors typically has been accomplished with two planar detectors in a fixed position with the breast under compression. The potential use of PEM imaging at two detector positions to guide stereotactic breast biopsy has motivated us to use PEM coincidence data acquired at two or more detector positions together in a single image reconstruction. Multiple angle PEM acquisition and iterative image reconstruction were investigated using point source and compressed breast phantom acquisitions with 5, 9, 12 and 15 mm diameter spheres and a simulated tumor:background activity concentration ratio of 6:1. Image reconstruction was performed with an iterative MLEM algorithm that used coincidence events between any two detector pixels on opposed detector heads at each detector position. This present study compared two acquisition protocols: 2 angle acquisition with detector angular positions of -15 and +15 degrees and 11 angle acquisition with detector positions spaced at 3 degree increments over the range -15 to +15 degrees. Three- dimensional image resolution was assessed for the point source acquisitions, and contrast and signal-to-noise metrics were evaluated for the compressed breast phantom with different simulated tumor sizes. Radial and tangential resolutions were similar for the two protocols, while normal resolution was better for the 2 angle acquisition. Analysis is complicated by the asymmetric point spread functions. Signal- to-noise vs. contrast tradeoffs were better for 11 angle acquisition for the smallest visible 9 mm sphere, while tradeoff results were mixed for the larger and more easily visible 12 mm and 15 mm diameter spheres. Additional study is needed to better understand the performance of limited angle tomography for PEM. PEM tomography experiments with complete angular sampling are planned.

  7. DOD Acquisition Workforce Reduction Trends and Impacts

    Science.gov (United States)

    2016-06-07

    open competition to the maximum extent practicable. Further defining the requirements associated with market research is Federal Acquisition Regulation... operational testing; logistics operations ; maintenance depots, including "USMC [U.S. Marine Corps]; and S&T [Science and Technology]." Section 931(d) of...Organization Special Operations Command Acquisition Center Subtotal Department of the Army Army Materiel Command Army Information Systems Command3

  8. Serviceability of passenger trains during acquisition projects

    OpenAIRE

    Parada Puig, J.E.

    2015-01-01

    Acquiring assets that can be serviced cost effectively is a fundamental goal during large acquisition projects at NS, the largest railway company in the Netherlands. Buying passenger trains and providing their required services requires important strategic decisions involving both the trains and their technical service system. This thesis studies how serviceability is considered during acquisition projects in practice, and explores means to support decisions that intend to improve serviceabil...

  9. Skill Acquisition Curves and Military Training

    Science.gov (United States)

    1986-01-01

    group acquisition curves had one of two general shapes, either logarithmic (power function) or semi- logarithmic (exponential), including variants...is, so far as we aware, no inherent advantage to the use of equations in linear or logarithmic form other than that the display of fitted curves in...implications for the expected form of the acquisition curve . As Mazur and Hastie (1978) note, accumulation models yield the hyperbola (a power law

  10. An ecological theory of language acquisition

    OpenAIRE

    Francisco Lacerda; Ulla Sundberg

    2006-01-01

    An ecological approach to early language acquisition is presented in this article. The general view is that the ability of language communication must have arisen as an evolutionary adaptation to the representational needs of Homo sapiens and that about the same process is observed in language acquisition, although under different ecological settings. It is argued that the basic principles of human language communication are observed even in non-human species and that it is possible to accoun...

  11. Implementation Issues of Cross-border Acquisitions

    DEFF Research Database (Denmark)

    Wang, Daojuan; Moini, Hamid; Kuada, John

    This study investigates the impacts of main implementation activities on the success of cross-border acquisitions (CBAs) using the survey data from a sample of 103 CBAs conducted by the companies in Scandinavia. The results of regression analysis indicate that due diligence, integration extent......, while acquisition experience exerts negative effect. However, the evidence does not support that planning and coordination will contribute to CBA performance....

  12. Data acquisition and analysis for the energy-subtraction Compton scatter camera for medical imaging

    Science.gov (United States)

    Khamzin, Murat Kamilevich

    In response to the shortcomings of the Anger camera currently being used in conventional SPECT, particularly the trade-off between sensitivity and spatial resolution, a novel energy-subtraction Compton scatter camera, or the ESCSC, has been proposed. A successful clinical implementation of the ESCSC could revolutionize the field of SPECT. Features of this camera include utilization of silicon and CdZnTe detectors in primary and secondary detector systems, list-mode time stamping data acquisition, modular architecture, and post-acquisition data analysis. Previous ESCSC studies were based on Monte Carlo modeling. The objective of this work is to test the theoretical framework developed in previous studies by developing the data acquisition and analysis techniques necessary to implement the ESCSC. The camera model working in list-mode with time stamping was successfully built and tested thus confirming potential of the ESCSC that was predicted in previous simulation studies. The obtained data were processed during the post-acquisition data analysis based on preferred event selection criteria. Along with the construction of a camera model and proving the approach, the post-acquisition data analysis was further extended to include preferred event weighting based on the likelihood of a preferred event to be a true preferred event. While formulated to show ESCSC capabilities, the results of this study are important for any Compton scatter camera implementation as well as for coincidence data acquisition systems in general.

  13. Structural brain changes linked to delayed first language acquisition in congenitally deaf individuals.

    Science.gov (United States)

    Pénicaud, Sidonie; Klein, Denise; Zatorre, Robert J; Chen, Jen-Kai; Witcher, Pamela; Hyde, Krista; Mayberry, Rachel I

    2013-02-01

    Early language experience is essential for the development of a high level of linguistic proficiency in adulthood and in a recent functional Magnetic Resonance Imaging (fMRI) experiment, we showed that a delayed acquisition of a first language results in changes in the functional organization of the adult brain (Mayberry et al., 2011). The present study extends the question to explore if delayed acquisition of a first language also modulates the structural development of the brain. To this end, we carried out anatomical MRI in the same group of congenitally deaf individuals who varied in the age of acquisition of a first language, American Sign Language -ASL (Mayberry et al., 2011) and used a neuroanatomical technique, Voxel-Based Morphometry (VBM), to explore changes in gray and white matter concentrations across the brain related to the age of first language acquisition. The results show that delayed acquisition of a first language is associated with changes in tissue concentration in the occipital cortex close to the area that has been found to show functional recruitment during language processing in these deaf individuals with a late age of acquisition. These findings suggest that a lack of early language experience affects not only the functional but also the anatomical organization of the brain. Copyright © 2012 Elsevier Inc. All rights reserved.

  14. Fast and accurate simulations of diffusion-weighted MRI signals for the evaluation of acquisition sequences

    Science.gov (United States)

    Rensonnet, Gaëtan; Jacobs, Damien; Macq, Benoît.; Taquet, Maxime

    2016-03-01

    Diffusion-weighted magnetic resonance imaging (DW-MRI) is a powerful tool to probe the diffusion of water through tissues. Through the application of magnetic gradients of appropriate direction, intensity and duration constituting the acquisition parameters, information can be retrieved about the underlying microstructural organization of the brain. In this context, an important and open question is to determine an optimal sequence of such acquisition parameters for a specific purpose. The use of simulated DW-MRI data for a given microstructural configuration provides a convenient and efficient way to address this problem. We first present a novel hybrid method for the synthetic simulation of DW-MRI signals that combines analytic expressions in simple geometries such as spheres and cylinders and Monte Carlo (MC) simulations elsewhere. Our hybrid method remains valid for any acquisition parameters and provides identical levels of accuracy with a computational time that is 90% shorter than that required by MC simulations for commonly-encountered microstructural configurations. We apply our novel simulation technique to estimate the radius of axons under various noise levels with different acquisition protocols commonly used in the literature. The results of our comparison suggest that protocols favoring a large number of gradient intensities such as a Cube and Sphere (CUSP) imaging provide more accurate radius estimation than conventional single-shell HARDI acquisitions for an identical acquisition time.

  15. Whole left ventricular functional assessment from two minutes free breathing multi-slice CINE acquisition

    Science.gov (United States)

    Usman, M.; Atkinson, D.; Heathfield, E.; Greil, G.; Schaeffter, T.; Prieto, C.

    2015-04-01

    Two major challenges in cardiovascular MRI are long scan times due to slow MR acquisition and motion artefacts due to respiratory motion. Recently, a Motion Corrected-Compressed Sensing (MC-CS) technique has been proposed for free breathing 2D dynamic cardiac MRI that addresses these challenges by simultaneously accelerating MR acquisition and correcting for any arbitrary motion in a compressed sensing reconstruction. In this work, the MC-CS framework is combined with parallel imaging for further acceleration, and is termed Motion Corrected Sparse SENSE (MC-SS). Validation of the MC-SS framework is demonstrated in eight volunteers and three patients for left ventricular functional assessment and results are compared with the breath-hold acquisitions as reference. A non-significant difference (P > 0.05) was observed in the volumetric functional measurements (end diastolic volume, end systolic volume, ejection fraction) and myocardial border sharpness values obtained with the proposed and gold standard methods. The proposed method achieves whole heart multi-slice coverage in 2 min under free breathing acquisition eliminating the time needed between breath-holds for instructions and recovery. This results in two-fold speed up of the total acquisition time in comparison to the breath-hold acquisition.

  16. Fast single-element PN acquisition for the TDRSS MA system

    Science.gov (United States)

    Davisson, Lee D.; Flikkema, Paul G.

    1988-11-01

    A description is given and a performance analysis presented of a novel pseudonoise (PN) code acquisition approach for the tracking and data relay satellite system (TDRSS) multiaccess (MA) return subsystem. The MA subsystem uses a phased array onboard the TDRS with 30 elements whose received signals are each independently retransmitted to the ground for beam forming. In the current operational system, acquisition is performed by using a serial search of the possible PN epochs on the beam-formed 30-element signal. The approach performs acquisition on a single (arbitrary) element signal using a parallel (i.e., simultaneous) search of all possible PN epochs. Since only one element signal is used, no beam forming is required prior to PN acquisition. The approach is based on sampling and digital processing of the received signal and incorporates techniques which counteract the effects of Doppler and asynchronous data symboling. The probability of correct acquisition as a function of acquisition time, signal-to-noise ratio, data rate, and user satellite Doppler is analyzed.

  17. A DSP controlled data acquisition system for CELSIUS

    CERN Document Server

    Bengtsson, M; Ziemann, Volker

    2000-01-01

    We describe a data acquisition system based on two 10 MHz A/D-converters, a SHARC Digital Signal Processor (DSP), and a digital synthesizer used for triggering the A/D-converters. The temporal macrostructure of the data acquisition can be determined by external triggers or by timer interrupts from the DSP. In this way up to two million samples can be stored in DSP external memory. The samples are analyzed by directly fast Fourier transforming blocks of samples. In another mode we use software-based downmixing and filtering techniques to increase the resolution and zoom in on a small frequency band. Spectra of up to 5 MHz can be manipulated and displayed as waterfall plots or spectral maps on the host computer directly. Moreover, signals of up to 70 MHz can be analyzed by undersampling techniques. We use this system to analyze Schottky spectra from electron-cooled ion beams in CELSIUS and report drag rate measurements and observations of instabilities.

  18. A DSP controlled data acquisition system for CELSIUS

    Energy Technology Data Exchange (ETDEWEB)

    Bengtsson, M.; Lofnes, T.; Ziemann, V. E-mail: ziemann@tsl.uu.se

    2000-02-21

    We describe a data acquisition system based on two 10 MHz A/D-converters, a SHARC Digital Signal Processor (DSP), and a digital synthesizer used for triggering the A/D-converters. The temporal macrostructure of the data acquisition can be determined by external triggers or by timer interrupts from the DSP. In this way up to two million samples can be stored in DSP external memory. The samples are analyzed by directly fast Fourier transforming blocks of samples. In another mode we use software-based downmixing and filtering techniques to increase the resolution and zoom in on a small frequency band. Spectra of up to 5 MHz can be manipulated and displayed as waterfall plots or spectral maps on the host computer directly. Moreover, signals of up to 70 MHz can be analyzed by undersampling techniques. We use this system to analyze Schottky spectra from electron-cooled ion beams in CELSIUS and report drag rate measurements and observations of instabilities.

  19. The importance of post-acquisition integration for value creation and success of mergers and acquisitions

    OpenAIRE

    Savović, Slađana

    2012-01-01

    Companies often resort to mergers and acquisitions in order to gain access to new markets, introduce new products, expand their knowledge-base or improve the competitive advantage. Achieving success in mergers and acquisitions represents complex managerial challenges, as a great number of these transactions fail in creating value for shareholders. Post-acquisition integration is the most challenging phase during which value creation should be involved, but which may also involve numerous inte...

  20. Age of Acquisition Effects in Chinese EFL learners’ Delexicalized Verb and Collocation Acquisition

    OpenAIRE

    Miao Haiyan

    2015-01-01

    This paper investigates age of acquisition (AoA) effects and the acquisition of delexicalized verbs and collocations in Chinese EFL learners, and explores the underlying reasons from the connectionist model for these learners’ acquisition characteristics. The data were collected through a translation test consisted of delexialized verb information section and English-Chinese and Chinese-English collocation parts, aiming to focus on Chinese EFL learners’ receptive and productive abilities resp...

  1. Joystick acquisition in tufted capuchins (Cebus apella).

    Science.gov (United States)

    Leighty, Katherine A; Fragaszy, Dorothy M

    2003-09-01

    A number of nonhuman primate species have demonstrated the ability to use a joystick to control a cursor on a computer screen, yet the acquisition of this skill has not been the focus of systematic inquiry. Here, we examined joystick acquisition in four tufted capuchins under two directional relationships of joystick movement and resultant cursor displacement, isomorphic and inverted. To document the natural history of the acquisition of this skill, we recorded the development of visual tracking of the cursor and body tilting. Rates of acquisition were comparable between the two conditions. After mastering the task in one condition, subjects remastered the task at an accelerated rate in the opposing condition. All subjects significantly increased or maintained high proportions of cursor tracking throughout acquisition. All subjects demonstrated a postural tilt while moving the cursor from the mid-phase of acquisition through task mastery. In the isomorphic condition, all subjects tilted significantly more often in the direction of goal location than in the opposite direction. In three of the four series of tilting that were scored for subjects in the inverted condition, tilting occurred significantly more often toward the direction of goal location than the direction of required hand movement. Together these findings suggest that body tilting participates in the organization of directional movement of the cursor rather than reflecting merely the motoric requirements of the task (to manipulate a joystick).

  2. Review of advanced imaging techniques

    Directory of Open Access Journals (Sweden)

    Yu Chen

    2012-01-01

    Full Text Available Pathology informatics encompasses digital imaging and related applications. Several specialized microscopy techniques have emerged which permit the acquisition of digital images ("optical biopsies" at high resolution. Coupled with fiber-optic and micro-optic components, some of these imaging techniques (e.g., optical coherence tomography are now integrated with a wide range of imaging devices such as endoscopes, laparoscopes, catheters, and needles that enable imaging inside the body. These advanced imaging modalities have exciting diagnostic potential and introduce new opportunities in pathology. Therefore, it is important that pathology informaticists understand these advanced imaging techniques and the impact they have on pathology. This paper reviews several recently developed microscopic techniques, including diffraction-limited methods (e.g., confocal microscopy, 2-photon microscopy, 4Pi microscopy, and spatially modulated illumination microscopy and subdiffraction techniques (e.g., photoactivated localization microscopy, stochastic optical reconstruction microscopy, and stimulated emission depletion microscopy. This article serves as a primer for pathology informaticists, highlighting the fundamentals and applications of advanced optical imaging techniques.

  3. 48 CFR 852.273-71 - Alternative negotiation techniques.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 5 2010-10-01 2010-10-01 false Alternative negotiation....273-71 Alternative negotiation techniques. As prescribed in 873.110(b), insert the following provision: Alternative Negotiation Techniques (JAN 2003) The contracting officer may elect to use the...

  4. 48 CFR 9904.417-50 - Techniques for application.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 7 2010-10-01 2010-10-01 false Techniques for application... ACCOUNTING STANDARDS COST ACCOUNTING STANDARDS 9904.417-50 Techniques for application. (a) The cost of money... capitalized, such as the method used for financial accounting and reporting, may be used, provided...

  5. 48 CFR 9905.501-50 - Techniques for application.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 7 2010-10-01 2010-10-01 false Techniques for application... ACCOUNTING STANDARDS COST ACCOUNTING STANDARDS FOR EDUCATIONAL INSTITUTIONS 9905.501-50 Techniques for... practices used in estimating costs in pricing a proposal and in accumulating and reporting costs on...

  6. 48 CFR 9904.401-50 - Techniques for application.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 7 2010-10-01 2010-10-01 false Techniques for application... ACCOUNTING STANDARDS COST ACCOUNTING STANDARDS 9904.401-50 Techniques for application. (a) The standard... in estimating costs in pricing a proposal and in accumulating and reporting costs on the...

  7. Updated NGNP Fuel Acquisition Strategy

    Energy Technology Data Exchange (ETDEWEB)

    David Petti; Tim Abram; Richard Hobbins; Jim Kendall

    2010-12-01

    A Next Generation Nuclear Plant (NGNP) fuel acquisition strategy was first established in 2007. In that report, a detailed technical assessment of potential fuel vendors for the first core of NGNP was conducted by an independent group of international experts based on input from the three major reactor vendor teams. Part of the assessment included an evaluation of the credibility of each option, along with a cost and schedule to implement each strategy compared with the schedule and throughput needs of the NGNP project. While credible options were identified based on the conditions in place at the time, many changes in the assumptions underlying the strategy and in externalities that have occurred in the interim requiring that the options be re-evaluated. This document presents an update to that strategy based on current capabilities for fuel fabrication as well as fuel performance and qualification testing worldwide. In light of the recent Pebble Bed Modular Reactor (PBMR) project closure, the Advanced Gas Reactor (AGR) fuel development and qualification program needs to support both pebble and prismatic options under the NGNP project. A number of assumptions were established that formed a context for the evaluation. Of these, the most important are: • Based on logistics associated with the on-going engineering design activities, vendor teams would start preliminary design in October 2012 and complete in May 2014. A decision on reactor type will be made following preliminary design, with the decision process assumed to be completed in January 2015. Thus, no fuel decision (pebble or prismatic) will be made in the near term. • Activities necessary for both pebble and prismatic fuel qualification will be conducted in parallel until a fuel form selection is made. As such, process development, fuel fabrication, irradiation, and testing for pebble and prismatic options should not negatively influence each other during the period prior to a decision on reactor type

  8. 76 FR 31393 - Federal Acquisition Regulation; Federal Acquisition Circular 2005-52; Introduction

    Science.gov (United States)

    2011-05-31

    ... implement Executive Order 13514, Federal Leadership in Environmental, Energy, and Economic Performance, and... specified, all Federal Acquisition Regulation (FAR) ] and other directive material contained in FAC...

  9. Supply Chain Management/Strategic Acquisition: The Case for Professional Pay in the Army Acquisition Corps

    Science.gov (United States)

    2012-04-01

    Supply Chain Management/ Strategic Acquisition: The Case for Professional Pay in the Army Acquisition Corps COL John Lemondes, USA This article assesses the opinions of Army Acquisition Workforce members who will serve in or are competing for program manager/command, or other leadership positions within the Army Acquisition Corps (AAC) on the subject of professional pay. A survey by the author determined: (a) whether professional pay would reduce loss of Army officers at the LTC/20-year point, with a lesser emphasis on COL/26-year point;

  10. 16 CFR 801.32 - Conversion and acquisition.

    Science.gov (United States)

    2010-01-01

    ... 16 Commercial Practices 1 2010-01-01 2010-01-01 false Conversion and acquisition. 801.32 Section... and acquisition. A conversion is an acquisition within the meaning of the act. Example: Assume that... period before “A” completes the acquisition of the X common stock, unless exempted by Section 7A(c)...

  11. 14 CFR 152.211 - Grant payments: Land acquisition.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 3 2010-01-01 2010-01-01 false Grant payments: Land acquisition. 152.211... acquisition. If an approved project for airport development includes land acquisition as an item for which... allowable project costs of the acquisition, after— (a) The Administrator determines that the sponsor...

  12. 48 CFR 1845.7101-3 - Unit acquisition cost.

    Science.gov (United States)

    2010-10-01

    ... 48 Federal Acquisition Regulations System 6 2010-10-01 2010-10-01 true Unit acquisition cost. 1845.7101-3 Section 1845.7101-3 Federal Acquisition Regulations System NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CONTRACT MANAGEMENT GOVERNMENT PROPERTY Forms Preparation 1845.7101-3 Unit acquisition cost....

  13. A Research on Second Language Acquisition and College English Teaching

    Science.gov (United States)

    Li, Changyu

    2009-01-01

    It was in the 1970s that American linguist S.D. Krashen created the theory of "language acquisition". The theories on second language acquisition were proposed based on the study on the second language acquisition process and its rules. Here, the second language acquisition process refers to the process in which a learner with the…

  14. Intraoperative Evaluation of Laparoscopic Insufflation Technique for Quality Control in the OR

    OpenAIRE

    Jacobs, Volker R.; Morrison, John E.; Mundhenke, Christoph; Golombeck, Kirstin; Jonat, Walter

    2000-01-01

    Objective: With increasing technology and computerized systems in the OR, the physician's responsibility is growing. For intraoperative evaluation of insufflation techniques, a data acquisition model for quality control study of potential insufflation problems is necessary. Methods: A computer-based, online data acquisition model was designed with a Pentium notebook, PCMCIA data acquisition board PCI-460-P1 and a Visual Designer 3.0 measurement program (both Intelligent Instrumentation, Inc.,...

  15. Fast integrator based data acquisition system for the SST-1 Thomson scattering system

    Science.gov (United States)

    Patel, Kiran; Kumar, Ajai

    2010-04-01

    An operational transconductance amplifier based fast charge-integrating module (FCIM) is designed and developed for an easy acquisition of fast Thomson scattered and background signal. FCIM based data acquisition technique can be used for the measurement of charge pulses of <20 ns duration. The response of the module is tested using a standard pulsed charge-generating module. The measuring charge range of the module depends on the integrating capacitor. Comparison of the performance of FCIM to commercially available module shows that it has better dynamic range with higher sensitivity and less measurement error. The module is quite cost effective and has many new features.

  16. Fast integrator based data acquisition system for the SST-1 Thomson scattering system

    Energy Technology Data Exchange (ETDEWEB)

    Patel, Kiran; Kumar, Ajai [Institute for Plasma Research, Bhat, Gandhinagar 382 428 (India)

    2010-04-15

    An operational transconductance amplifier based fast charge-integrating module (FCIM) is designed and developed for an easy acquisition of fast Thomson scattered and background signal. FCIM based data acquisition technique can be used for the measurement of charge pulses of <20 ns duration. The response of the module is tested using a standard pulsed charge-generating module. The measuring charge range of the module depends on the integrating capacitor. Comparison of the performance of FCIM to commercially available module shows that it has better dynamic range with higher sensitivity and less measurement error. The module is quite cost effective and has many new features.

  17. Critical Thinking: A Missing Ingredient in DoD’s Acquisition (Education) System

    Science.gov (United States)

    2014-10-01

    ability to mentor their teams on sound critical, creative and analytical thinking techniques. Many of these changes counter DAU’s cost-per-training... Thinking : A Missing Ingredient in DoD’s Acquisition (Education) System 5a. CONTRACT NUMBER 5b. GRANT NUMBER 5c. PROGRAM ELEMENT NUMBER 6. AUTHOR(S) 5d...Rev. 8-98) Prescribed by ANSI Std Z39-18 Critical Thinking A Missing Ingredient in DoD’s Acquisition (Education) System Sean M. Frisbee n Scott

  18. Analysis of International Mergers and Acquisitions in the Pharmaceutical Industry

    Directory of Open Access Journals (Sweden)

    Božo Matić

    2011-07-01

    Full Text Available There are numerous researches which analyze mergers and acquisitions, but most of them do not focus on a certain industry, but their sample considers companies from different industries. This paper focuses on mergers and acquisitions in the pharmaceutical industry. It is assumed that pharmaceutical companies with no experience in mergers and acquisitions achieve better results in relatively small and domestic mergers and acquisitions while pharmaceutical companies with greater experience in mergers and acquisitions are successful even in bigger and international mergers and acquisitions. Bigger mergers and acquisitions and international mergers and acquisitions are more risky for the companies so lack of experience in mergers and acquisitions additionally increases risks during the process of mergers and acquisitions. On average, such increase of the risk results in lower returns for stock owners of pharmaceutical companies.

  19. Combinatorial techniques

    CERN Document Server

    Sane, Sharad S

    2013-01-01

    This is a basic text on combinatorics that deals with all the three aspects of the discipline: tricks, techniques and theory, and attempts to blend them. The book has several distinctive features. Probability and random variables with their interconnections to permutations are discussed. The theme of parity has been specially included and it covers applications ranging from solving the Nim game to the quadratic reciprocity law. Chapters related to geometry include triangulations and Sperner's theorem, classification of regular polytopes, tilings and an introduction to the Eulcidean Ramsey theory. Material on group actions covers Sylow theory, automorphism groups and a classification of finite subgroups of orthogonal groups. All chapters have a large number of exercises with varying degrees of difficulty, ranging from material suitable for Mathematical Olympiads to research.

  20. User-oriented data acquisition chain task planning algorithm for operationally responsive space satellite

    Institute of Scientific and Technical Information of China (English)

    Hao Chen; Jun Li; Ning Jing

    2016-01-01

    With the development of operational y responsive space (ORS) and on-board processing techniques, the end users can receive the observation data from the ORS satel ite directly. To satisfy the demand for reducing the requirements-tasking-effects cycle from one day to hours, the various resources of the whole data acquisition chain (including satel ites, ground stations, data processing centers, users, etc.) should be taken into an overal consideration, and the traditional batch task planning mode should be transformed into the user-oriented task planning mode. Con-sidering there are many approaches for data acquisition due to the new techniques of ORS satel ite, the data acquisition chain task planning problem for ORS satel ite can be seen as the multi-modal route planning problem. Thereby, a framework is presented using label-constrained shortest path technique with the conflict resolution. To apply this framework to solve the ORS satel ite task planning problem, the preprocessing and the conflict resolution strategies are discussed in detail. Based on the above work, the user-oriented data acquisition chain task planning algorithm for ORS satel ite is proposed. The exact solution can be obtained in polynomial time using the proposed algorithm. The simulation experiments validate the feasibility and the adaptability of the pro-posed approach.

  1. 77 FR 38734 - Defense Federal Acquisition Regulation Supplement; Acquisition of Tents and Other Temporary...

    Science.gov (United States)

    2012-06-29

    ... Regulation Supplement; Acquisition of Tents and Other Temporary Structures (DFARS Case 2012-D015) AGENCY... 2012 that address the acquisition of tents and other temporary structures. DATES: Effective date: June... the best value, when acquiring tents and other temporary structures, regardless of whether...

  2. Societal Responses to Adult Difficulties in L2 Acquisition: Toward an Evolutionary Perspective on Language Acquisition

    Science.gov (United States)

    Schumann, John H.

    2013-01-01

    It is generally accepted that second language (L2) acquisition becomes more difficult as one grows older and that success in adult L2 acquisition is highly variable. Nevertheless, humans in language contact situations have to cope with intergroup communication. This article examines the ways society has responded to this challenge. It describes…

  3. 77 FR 30365 - Defense Federal Acquisition Regulation Supplement: Report on Waiver of Prohibition on Acquisition...

    Science.gov (United States)

    2012-05-22

    ... Regulation Supplement: Report on Waiver of Prohibition on Acquisition From Communist Chinese Military... prohibition on acquisition of United States Munitions List items from Communist Chinese military companies... Chinese military companies. The prior requirement was for a report within 30 days after the date of the...

  4. Acquisition Management for System of Systems: Requirement Evolution and Acquisition Strategy Planning

    Science.gov (United States)

    2013-01-29

    inefficiencies and warranted the pursuit of better systems engineering practices to encompass SoS principles. The recognition of the need for improved...important for providing acquisition groups with the means of performing acquisition, integration, and development decision-making in the mist of evolving

  5. Differences between Children’s first Language Acquisition and Adults’ second Language Acquisition

    Institute of Scientific and Technical Information of China (English)

    杜燕燕

    2013-01-01

    Discuss the differences between children’s first language acquisition and adults’second language acquisition from four aspects: age, motivation, environment, learning process and content in order to help adults to learn L2 more efficiently by applying some of the knacks for L1 to L2.

  6. 78 FR 80381 - Federal Acquisition Regulation; Federal Acquisition Circular 2005-72; Small Entity Compliance Guide

    Science.gov (United States)

    2013-12-31

    ...This document is issued under the joint authority of DOD, GSA, and NASA. This Small Entity Compliance Guide has been prepared in accordance with section 212 of the Small Business Regulatory Enforcement Fairness Act of 1996. It consists of a summary of the rules appearing in Federal Acquisition Circular (FAC) 2005-72, which amends the Federal Acquisition Regulation (FAR). An asterisk (*) next......

  7. Iconicity and Sign Lexical Acquisition: A Review

    Science.gov (United States)

    Ortega, Gerardo

    2017-01-01

    The study of iconicity, defined as the direct relationship between a linguistic form and its referent, has gained momentum in recent years across a wide range of disciplines. In the spoken modality, there is abundant evidence showing that iconicity is a key factor that facilitates language acquisition. However, when we look at sign languages, which excel in the prevalence of iconic structures, there is a more mixed picture, with some studies showing a positive effect and others showing a null or negative effect. In an attempt to reconcile the existing evidence the present review presents a critical overview of the literature on the acquisition of a sign language as first (L1) and second (L2) language and points at some factor that may be the source of disagreement. Regarding sign L1 acquisition, the contradicting findings may relate to iconicity being defined in a very broad sense when a more fine-grained operationalisation might reveal an effect in sign learning. Regarding sign L2 acquisition, evidence shows that there is a clear dissociation in the effect of iconicity in that it facilitates conceptual-semantic aspects of sign learning but hinders the acquisition of the exact phonological form of signs. It will be argued that when we consider the gradient nature of iconicity and that signs consist of a phonological form attached to a meaning we can discern how iconicity impacts sign learning in positive and negative ways. PMID:28824480

  8. Women's beliefs concerning condom acquisition and use.

    Science.gov (United States)

    Libbus, K

    1995-10-01

    Condoms are a time-honored and reliable method of protection against pregnancy and sexually transmitted infections. However, their use, and thus their effectiveness, is determined by individual behavior. The purpose of this paper is to report attitudes and salient beliefs related to condom use in a sample of adult women. The study used Ajzen and Fishbein's Theory of Planned Behavior to identify modal, salient beliefs regarding condom acquisition and use as intentional behaviors. The study sample consisted of 58 community women who reported using condoms for contraceptive purposes within the last five years. In face-to-face, audiotaped interviews, open-ended questions were used to solicit beliefs regarding condom acquisition and use. All subject narratives were content-analyzed for recurrent themes. Women cited accessibility and effectiveness in preventing pregnancy and sexually transmitted diseases as both advantages and as factors contributing to the ease of acquisition and use. Disadvantages and factors that might deter condom acquisition and use included embarrassment, objections by male partner, and effect on spontaneity. Overall, subjects exhibited accurate knowledge regarding the benefits of condom acquisition and use. However, it is possible that expressed negative beliefs could take precedence in decision-making and reduce the probability of consistent condom use.

  9. Analysis of Rapid Acquisition Processes to Fulfill Future Urgent Needs

    Science.gov (United States)

    2015-12-01

    minimally expanded the language regarding rapid acquisition process to include “Evolutionary acquisition is the preferred DOD strategy for rapid...requirements for rapid acquisition of ACAT I & IA programs. Second, identify how DOD will fund rapid acquisition programs. Third , identify who in DOD will...directives is challenging but necessary. 40 Third , organizational structure must remain in place to support the rapid acquisition process, we must

  10. Learning the „Look-at-you-go” Moment in Corporate Governance Negotiation Techniques

    Directory of Open Access Journals (Sweden)

    Clara VOLINTIRU

    2015-06-01

    Full Text Available This article explores in an interdisciplinary manner the way concepts are learned or internalized, depending on the varying means of transmission, as well as on the sequencing in which the information is transmitted. In this sense, we build on the constructivist methodology framework in assessing concept acquisition in academic disciplines, at an advanced level. We also present the evolution of certain negotiation techniques, from traditional setting, to less predictable ones. This assessment is compared to a specific Pop Culture case study in which we find an expressive representation of negotiation techniques. Our methodology employs both focus groups and experimental design to test the relative positioning of theoretical concept acquisition (TCA as opposed to expressive concept-acquisition (ECA. Our findings suggest that while expressive concept acquisition (ECA via popular culture representations enhances the students understanding of negotiation techniques, this can only happen in circumstances in which a theoretical concept acquisition (TCA is pre-existent.

  11. Nanatsu-no-kata, Endō-no-kata, and Jōge-no-kata ―A pedagogical and qualitative biomechanical evaluation of Hirano Tokio’s kuzushi (unbalancing concept as part of skill acquisition for throwing techniques in Kōdōkan jūdō

    Directory of Open Access Journals (Sweden)

    Carl De Crée

    2014-06-01

    Full Text Available Hirano Tokio (1922-1993 was a talented jūdō champion who developed his own pedagogical approach towards teaching and practicing kuzushi (unbalancing and tsukuri (preparation, two critical skills for successfully applying jūdō throws. In his approach, Hirano emphasizes the use of rotational unbalancing preceded by strategic movements that mimic water waves. No biomechanical analysis of Hirano’s wave system has previously been attempted. The purpose of this paper is to provide a detailed survey of Hirano’s didactic system comparing it with traditional Kōdōkan teachings, and to assess its biomechanical foundations. The fluid dynamic modeling of the several kinds of waves proposed by Hirano is mathematically complicated and heavily relies on Boussinesq differential equations. Given the involvement of numerous parameters in determining the hydrodynamic behavior of water (depth, period of waves, saliency, temperatures, currents, shape of the coastal line, water density, wind which are absent in the surroundings of a pair of two jūdōka moving indoors on a tatami, Hirano’s system appears limited to a mere visualization and metaphysical interpretation of jūdō. The lack of empirical and experimental data available obtained in large groups of students taught according to Hirano’s approach make it so far impossible to conclude whether it facilitates kuzushi and tsukuri skill acquisition. Ultimately Hirano’s wave-based kuzushi/tsukuri does not alter the biomechanical analysis previously proposed by Sacripanti, as it still is all about general action invariants aimed to close the distance between both opponents, to break the opponent’s symmetry, and to apply one of the infinite options to achieve this.

  12. Astromaterials Acquisition and Curation Office (KT) Overview

    Science.gov (United States)

    Allen, Carlton

    2014-01-01

    The Astromaterials Acquisition and Curation Office has the unique responsibility to curate NASA's extraterrestrial samples - from past and forthcoming missions - into the indefinite future. Currently, curation includes documentation, preservation, physical security, preparation, and distribution of samples from the Moon, asteroids, comets, the solar wind, and the planet Mars. Each of these sample sets has a unique history and comes from a unique environment. The curation laboratories and procedures developed over 40 years have proven both necessary and sufficient to serve the evolving needs of a worldwide research community. A new generation of sample return missions to destinations across the solar system is being planned and proposed. The curators are developing the tools and techniques to meet the challenges of these new samples. Extraterrestrial samples pose unique curation requirements. These samples were formed and exist under conditions strikingly different from those on the Earth's surface. Terrestrial contamination would destroy much of the scientific significance of extraterrestrial materials. To preserve the research value of these precious samples, contamination must be minimized, understood, and documented. In addition, the samples must be preserved - as far as possible - from physical and chemical alteration. The elaborate curation facilities at JSC were designed and constructed, and have been operated for many years, to keep sample contamination and alteration to a minimum. Currently, JSC curates seven collections of extraterrestrial samples: (a)) Lunar rocks and soils collected by the Apollo astronauts, (b) Meteorites collected on dedicated expeditions to Antarctica, (c) Cosmic dust collected by high-altitude NASA aircraft,t (d) Solar wind atoms collected by the Genesis spacecraft, (e) Comet particles collected by the Stardust spacecraft, (f) Interstellar dust particles collected by the Stardust spacecraft, and (g) Asteroid soil particles collected

  13. Optimisation of acquisition time in bioluminescence imaging

    Science.gov (United States)

    Taylor, Shelley L.; Mason, Suzannah K. G.; Glinton, Sophie; Cobbold, Mark; Styles, Iain B.; Dehghani, Hamid

    2015-03-01

    Decreasing the acquisition time in bioluminescence imaging (BLI) and bioluminescence tomography (BLT) will enable animals to be imaged within the window of stable emission of the bioluminescent source, a higher imaging throughput and minimisation of the time which an animal is anaesthetised. This work investigates, through simulation using a heterogeneous mouse model, two methods of decreasing acquisition time: 1. Imaging at fewer wavelengths (a reduction from five to three); and 2. Increasing the bandwidth of filters used for imaging. The results indicate that both methods are viable ways of decreasing the acquisition time without a loss in quantitative accuracy. Importantly, when choosing imaging wavelengths, the spectral attenuation of tissue and emission spectrum of the source must be considered, in order to choose wavelengths at which a high signal can be achieved. Additionally, when increasing the bandwidth of the filters used for imaging, the bandwidth must be accounted for in the reconstruction algorithm.

  14. Optimization of Hierarchical System for Data Acquisition

    Directory of Open Access Journals (Sweden)

    V. Novotny

    2011-04-01

    Full Text Available Television broadcasting over IP networks (IPTV is one of a number of network applications that are except of media distribution also interested in data acquisition from group of information resources of variable size. IP-TV uses Real-time Transport Protocol (RTP protocol for media streaming and RTP Control Protocol (RTCP protocol for session quality feedback. Other applications, for example sensor networks, have data acquisition as the main task. Current solutions have mostly problem with scalability - how to collect and process information from large amount of end nodes quickly and effectively? The article deals with optimization of hierarchical system of data acquisition. Problem is mathematically described, delay minima are searched and results are proved by simulations.

  15. A Lossless Network for Data Acquisition

    CERN Document Server

    AUTHOR|(SzGeCERN)698154; The ATLAS collaboration; Lehmann Miotto, Giovanna

    2016-01-01

    The planned upgrades of the experiments at the Large Hadron Collider at CERN will require higher bandwidth networks for their data acquisition systems. The network congestion problem arising from the bursty many-to-one communication pattern, typical for these systems, will become more demanding. It is questionable whether commodity TCP/IP and Ethernet technologies in their current form will be still able to effectively adapt to the bursty traffic without losing packets due to the scarcity of buffers in the networking hardware. We continue our study of the idea of lossless switching in software running on commercial-off-the-shelf servers for data acquisition systems, using the ATLAS experiment as a case study. The flexibility of design in software, performance of modern computer platforms, and buffering capabilities constrained solely by the amount of DRAM memory are a strong basis for building a network dedicated to data acquisition with commodity hardware, which can provide reliable transport in congested co...

  16. Modelling for Industrial Land Acquisition for SEZ

    Directory of Open Access Journals (Sweden)

    Shatadru, Gupta

    2009-03-01

    Full Text Available Emergence of a new operational paradigm in the form of Special Economic Zone (SEZ and acquisition of industrial land therefore is one of the most controversial issues in India and a debatable issue in some parts in Asia in recent times. There is no doubt that it will lead to rapid industrial and economic growth. But the process of development is under question as local agitations against acquisition of land for the purpose have turned violent. Understanding the condition is important for the host country as well as the nations of Europe and the USA sourcing considerable amount of FDI flow. In this paper, we propose a model for industrial land acquisition which provides for rehabilitation of those displaced outside the perimeter of the SEZ, so that the appreciation of land price accrues to them and the land owner becomes a part of the prosperity that the project generates.

  17. Automatic acquisition of pattern collocations in GO

    Institute of Scientific and Technical Information of China (English)

    LIU Zhi-qing; DOU Qing; LI Wen-hong; LU Ben-jie

    2008-01-01

    The quality, quantity, and consistency of the knowledgeused in GO-playing programs often determine their strengths,and automatic acquisition of large amounts of high-quality andconsistent GO knowledge is crucial for successful GO playing.In a previous article of this subject, we have presented analgorithm for efficient and automatic acquisition of spatialpatterns of GO as well as their frequency of occurrence fromgame records. In this article, we present two algorithms, one forefficient and automatic acquisition of pairs of spatial patternsthat appear jointly in a local context, and the other for deter-mining whether the joint pattern appearances are of certainsignificance statistically and not just a coincidence. Results ofthe two algorithms include 1 779 966 pairs of spatial patternsacquired automatically from 16 067 game records of profess-sional GO players, of which about 99.8% are qualified as patterncollocations with a statistical confidence of 99.5% or higher.

  18. Experimental Techniques

    DEFF Research Database (Denmark)

    Wyer, Jean

    2013-01-01

    Gas-phase ion spectroscopy requires specialised apparatus, both when it comes to measuring photon absorption and light emission (fluorescence). The reason is much lower ion densities compared to solution-phase spectroscopy. In this chapter different setups are described, all based on mass spectro...... in data interpretation, and the advantages and disadvantages of the different techniques are clarified. New instrumental developments involving cryo-cooled storage rings, which show great promise for the future, are briefly touched upon.......Gas-phase ion spectroscopy requires specialised apparatus, both when it comes to measuring photon absorption and light emission (fluorescence). The reason is much lower ion densities compared to solution-phase spectroscopy. In this chapter different setups are described, all based on mass...... to circumvent this is discussed based on a chemical approach, namely tagging of ammonium groups by crown ether. Prompt dissociation can sometimes be identified from the total beam depletion differing from that due to statistical dissociation. Special emphasis in this chapter is on the limitations and pitfalls...

  19. Multispectral integral imaging acquisition and processing using a monochrome camera and a liquid crystal tunable filter.

    Science.gov (United States)

    Latorre-Carmona, Pedro; Sánchez-Ortiga, Emilio; Xiao, Xiao; Pla, Filiberto; Martínez-Corral, Manuel; Navarro, Héctor; Saavedra, Genaro; Javidi, Bahram

    2012-11-01

    This paper presents an acquisition system and a procedure to capture 3D scenes in different spectral bands. The acquisition system is formed by a monochrome camera, and a Liquid Crystal Tunable Filter (LCTF) that allows to acquire images at different spectral bands in the [480, 680]nm wavelength interval. The Synthetic Aperture Integral Imaging acquisition technique is used to obtain the elemental images for each wavelength. These elemental images are used to computationally obtain the reconstruction planes of the 3D scene at different depth planes. The 3D profile of the acquired scene is also obtained using a minimization of the variance of the contribution of the elemental images at each image pixel. Experimental results show the viability to recover the 3D multispectral information of the scene. Integration of 3D and multispectral information could have important benefits in different areas, including skin cancer detection, remote sensing and pattern recognition, among others.

  20. The Differences between Emergentism & Skill Acquisition Theory

    Directory of Open Access Journals (Sweden)

    Naeemeh Kharaghani

    2017-01-01

    Full Text Available Although both emergentism and skill acquisition theory developed in the same field (cognitive theories and as an attempt to replace Universal grammar-based approaches, there are some differences between these two theories. The differences lie under their different models of knowledge representation and their diverse degree of emphasis on the role of input. In addition, skill acquisition considers the process of learning while emergentism considers input and output, and what goes on in between has not been considered. Finally it should be mentioned that these two theories take different views towards the learning process. 

  1. Information Acquisition and Strategic Disclosure in Oligopoly

    DEFF Research Database (Denmark)

    Jansen, Jos

    2008-01-01

    I study the incentives of oligopolists to acquire and disclose information on a common demand intercept. Because firms may fail to acquire information even when they invest in information acquisition, firms can credibly conceal unfavorable news while disclosing favorable news. Firms may earn higher...... expected profits under such a selective disclosure regime than under the regimes where firms commit to share all or no information. In particular, this holds under both Cournot and Bertrand competition, if the firms have sufficiently flat information acquisition cost functions. For steeper cost functions...

  2. Memory-Based Lexical Acquisition and Processing

    CERN Document Server

    Daelemans, W

    1994-01-01

    Current approaches to computational lexicology in language technology are knowledge-based (competence-oriented) and try to abstract away from specific formalisms, domains, and applications. This results in severe complexity, acquisition and reusability bottlenecks. As an alternative, we propose a particular performance-oriented approach to Natural Language Processing based on automatic memory-based learning of linguistic (lexical) tasks. The consequences of the approach for computational lexicology are discussed, and the application of the approach on a number of lexical acquisition and disambiguation tasks in phonology, morphology and syntax is described.

  3. KNOWLEDGE ACQUISITION AMONG ENGINEEERS IN MNCS

    Directory of Open Access Journals (Sweden)

    Fakhrorazi Ahmad

    2013-06-01

    Full Text Available The objective of this paper is to investigate the relationship between individual’s absorptive capacity and knowledge acquisition behavior among engineers in the electrical and electronic (E&E sector in Malaysia. The study utilized survey method to collect the data. There were 305 responses for the survey. Partial least square (PLS properties of structural equation modeling (SEM were used to measure the relationships between the variables. The study found only partial support in absorptive capacity ability to influence knowledge acquisition behavior.

  4. Acquisition of Romani in a Bilingual Context

    Directory of Open Access Journals (Sweden)

    Kyuchukov Hristo

    2014-11-01

    Full Text Available The paper presents research findings from research on Roma children and their acquisition of different grammatical categories in the Romani language. Results from three different studies with Roma children from Bulgaria are discussed: acquisition of mental state verbs (MSV, Bates-MacArthur Communicative Development Inventories (CDI in Romani and subtests from DELV (Seymour, Roeper, & de Villiers, 2005. All the testing and research shows that Roma children follow the paths of normally developing children in their language development. Roma children are able to correctly use nouns, verbs, wh-questions and to assume different communicative roles.

  5. COS FUV Target Acquisition Algorithm Verification

    Science.gov (United States)

    Soderblom, David

    2009-07-01

    Verify the ability of the COS FSW to place an isolated point source at the center of the aperture, both for the BOA and PSA, using dispersed light from the object using the FUV gratings. The various options for target centering should be exercised and shown to work properly. This test is for acquisitions in dispersed-light mode only. This program is modeled from SMOV activity summary COS28.This program should be executed two or more weeks after visit 12 of 11469, and after the SIAF update, so that we have confirmed that NUV imaging acquisitions work properly with the BOA.

  6. New data acquisition system for AMS

    Energy Technology Data Exchange (ETDEWEB)

    Pfenninger, R. [Paul Scherrer Inst. (PSI), Villigen (Switzerland)

    1997-09-01

    A new data acquisition system based on a VME front-end computer, a Sun workstation and a PC has been installed. It is used for the acquisition of mainly AMS data, their graphical display, and storage of the data in a Oracle database. The measurement of magazines of 25 sample each is fully automated. Several data parameters such as transmission are regularly checked. In case of problems the operator is informed by optical and/or acoustical signals. Screens are updated automatically after every measurement cycle. (author) 1 fig.

  7. On Acculturation and Second Language Acquisition

    Institute of Scientific and Technical Information of China (English)

    刘翠萍

    2015-01-01

    Language is not just a carrier of culture, but also a part of culture.Culture has a great impact on language and language acquisition.Acculturation theory, which was established by Schumann in 1978, analyzes the important factors in learning a second language from two aspects of social distance and psychological distance, thus providing a methodological and epistemological guidance for the English language teaching in China as well as a theoretical guidance for L2 learners to further understand the SLA law and create favorable external and internal environment for second language acquisition.

  8. Greenfields and acquisitions: a comparative analysis

    Directory of Open Access Journals (Sweden)

    Nicolae MARINESCU

    2016-07-01

    Full Text Available This paper compares greenfields and acquisitions as foreign direct investment (FDI alternatives used by transnational corporations (TNCs. First, the determinants leading to the choice of companies between the two modes of entry into a foreign market are laid out. Then, specific features of each alternative are highlighted, by contrasting the advantages and disadvantages of both types of FDI. Based on this analysis, some conclusions are drawn in the end concerning the most important factors that influence the decision of a company whether to choose a greenfield investment or an acquisition.

  9. A computerised morphometric technique for the analysis of intimal hyperplasia.

    OpenAIRE

    Tennant, M; McGeachie, J K

    1991-01-01

    The aim of this study was to design, develop and employ a method for the acquisition of a significant data base of thickness measurements. The integration of standard histological techniques (step serial sectioning), modern computer technology and a personally developed software package (specifically designed for thickness measurement) produced a novel technique suitable for the task. The technique allowed the elucidation of a larger data set from tissue samples. Thus a detailed and accurate ...

  10. Dynamic MRI of the liver with parallel acquisition technique. Characterization of focal liver lesions and analysis of the hepatic vasculature in a single MRI session; Dynamische MRT der Leber mit paralleler Akquisitionstechnik. Charakterisierung fokaler Leberlaesionen und Analyse des Gefaessstatus in einem Untersuchungsgang

    Energy Technology Data Exchange (ETDEWEB)

    Heilmaier, C. [Inst. fuer Diagnostische und Interventionelle Radiologie und Neuroradiologie, Universitaetsklinikum Essen (Germany); Inst. fuer Diagnostische Radiologie, Universitaetsspital Zuerich (Switzerland); Sutter, R. [Inst. fuer Diagnostische Radiologie, Universitaetsspital Zuerich (Switzerland); Lutz, A.M.; Willmann, J.K. [Inst. fuer Diagnostische Radiologie, Universitaetsspital Zuerich (Switzerland); Dept. of Radiology, Stanford Univ. (United States); Seifert, B. [Abt. Biostatistik, Univ. Zuerich (Switzerland)

    2008-05-15

    Purpose: to retrospectively evaluate the performance of breath-hold contrast-enhanced 3D dynamic parallel gradient echo MRI (pMRT) for the characterization of focal liver lesions (standard of reference: histology) and for the analysis of hepatic vasculature (standard of reference: contrast-enhanced 64-detector row computed tomography; MSCT) in a single MRI session. Materials and method: two blinded readers independently analyzed preoperative pMRT data sets (1.5T-MRT) of 45 patients (23 men, 22 women; 28 - 77 years, average age, 48 years) with a total of 68 focal liver lesions with regard to image quality of hepatic arteries, portal and hepatic veins, presence of variant anatomy of the hepatic vasculature, as well as presence of portal vein thrombosis and hemodynamically significant arterial stenosis. In addition, both readers were asked to identify and characterize focal liver lesions. Imaging parameters of pMRT were: TR/TE/matrix/slice thickness/acquisition time: 3.1 ms/1.4 ms/384 x 224/4 mm/15 - 17 s. MSCT was performed with a pitch of 1.2, an effective slice thickness of 1 mm and a matrix of 512 x 512. Results: based on histology, the 68 liver lesions were found to be 42 hepatocellular carcinomas (HCC), 20 metastases, 3 cholangiocellular carcinomas (CCC) as well as 1 dysplastic nodule, 1 focal nodular hyperplasia (FNH) and 1 atypical hemangioma. Overall, the diagnostic accuracy was high for both readers (91 - 100%) in the characterization of these focal liver lesions with an excellent interobserver agreement ({kappa}-values of 0.89 [metastases], 0.97 [HCC] and 1 [CCC]). On average, the image quality of all vessels under consideration was rated good or excellent in 89% (reader 1) and 90% (reader 2). Anatomical variants of the hepatic arteries, hepatic veins and portal vein as well as thrombosis of the portal vein were reliably detected by pMRT. Significant arterial stenosis was found with a sensitivity between 86% and 100% and an excellent interobserver agreement

  11. Epic Dimensions: a Comparative Analysis of 3d Acquisition Methods

    Science.gov (United States)

    Graham, C. A.; Akoglu, K. G.; Lassen, A. W.; Simon, S.

    2017-08-01

    When it comes to capturing the geometry of a cultural heritage artifact, there is certainly no dearth of possible acquisition techniques. As technology has rapidly developed, the availability of intuitive 3D generating tools has increased exponentially and made it possible even for non-specialists to create many models quickly. Though the by-products of these different acquisition methods may be incongruent in terms of quality, these discrepancies are not problematic, as there are many applications of 3D models, each with their own set of requirements. Comparisons of high-resolution 3D models of an iconic Babylonian tablet, captured via four different closerange technologies discussed in this paper assess which methods of 3D digitization best suit specific intended purposes related to research, conservation and education. Taking into consideration repeatability, time and resource implications, qualitative and quantitative potential and ease of use, this paper presents a study of the strengths and weakness of structured light scanning, triangulation laser scanning, photometric stereo and close-range photogrammetry, in the context of interactive investigation, conditions monitoring, engagement, and dissemination.

  12. Modeling Resource Utilization of a Large Data Acquisition System

    CERN Document Server

    Santos, Alejandro; The ATLAS collaboration

    2017-01-01

    The ATLAS 'Phase-II' upgrade, scheduled to start in 2024, will significantly change the requirements under which the data-acquisition system operates. The input data rate, currently fixed around 150 GB/s, is anticipated to reach 5 TB/s. In order to deal with the challenging conditions, and exploit the capabilities of newer technologies, a number of architectural changes are under consideration. Of particular interest is a new component, known as the Storage Handler, which will provide a large buffer area decoupling real-time data taking from event filtering. Dynamic operational models of the upgraded system can be used to identify the required resources and to select optimal techniques. In order to achieve a robust and dependable model, the current data-acquisition architecture has been used as a test case. This makes it possible to verify and calibrate the model against real operation data. Such a model can then be evolved toward the future ATLAS Phase-II architecture. In this paper we introduce the current ...

  13. Modelling Resource Utilization of a Large Data Acquisition System

    CERN Document Server

    Santos, Alejandro; The ATLAS collaboration

    2017-01-01

    The ATLAS 'Phase-II' upgrade, scheduled to start in 2024, will significantly change the requirements under which the data-acquisition system operates. The input data rate, currently fixed around 150 GB/s, is anticipated to reach 5 TB/s. In order to deal with the challenging conditions, and exploit the capabilities of newer technologies, a number of architectural changes are under consideration. Of particular interest is a new component, known as the Storage Handler, which will provide a large buffer area decoupling real-time data taking from event filtering. Dynamic operational models of the upgraded system can be used to identify the required resources and to select optimal techniques. In order to achieve a robust and dependable model, the current data-acquisition architecture has been used as a test case. This makes it possible to verify and calibrate the model against real operation data. Such a model can then be evolved toward the future ATLAS Phase-II architecture. In this paper we introduce the current ...

  14. Acquisition of stereo panoramas for display in VR environments

    KAUST Repository

    Ainsworth, Richard A.

    2011-01-23

    Virtual reality systems are an excellent environment for stereo panorama displays. The acquisition and display methods described here combine high-resolution photography with surround vision and full stereo view in an immersive environment. This combination provides photographic stereo-panoramas for a variety of VR displays, including the StarCAVE, NexCAVE, and CORNEA. The zero parallax point used in conventional panorama photography is also the center of horizontal and vertical rotation when creating photographs for stereo panoramas. The two photographically created images are displayed on a cylinder or a sphere. The radius from the viewer to the image is set at approximately 20 feet, or at the object of major interest. A full stereo view is presented in all directions. The interocular distance, as seen from the viewer\\'s perspective, displaces the two spherical images horizontally. This presents correct stereo separation in whatever direction the viewer is looking, even up and down. Objects at infinity will move with the viewer, contributing to an immersive experience. Stereo panoramas created with this acquisition and display technique can be applied without modification to a large array of VR devices having different screen arrangements and different VR libraries.

  15. Automatic acquisition and validation of sub-sentential paraphrases : a bilingual study Étude bilingue de l'acquisition et de la validation automatiques de paraphrases sous-phrastiques

    Directory of Open Access Journals (Sweden)

    Houda Bouamor

    2012-11-01

    Full Text Available This work uses parallel monolingual corpora for a detailed study of the task of subsentential paraphrase acquisition. We argue that the scarcity of this type of resource is compensated by the fact that it is the most suited type for studies on paraphrasing. We propose a large exploration of this task with experiments on two languages with five different acquisition techniques, selected for their complementarity, and their combinations. We report a significant gain over all techniques by validating candidate paraphrases using a maximum entropy classifier. An important result of our study is the identification of difficult-to-acquire paraphrase pairs, which are classified and quantified in a bilingual typology.

  16. Effect of temporal acquisition parameters on image quality of strain time constant elastography.

    Science.gov (United States)

    Nair, Sanjay; Varghese, Joshua; Chaudhry, Anuj; Righetti, Raffaella

    2015-04-01

    Ultrasound methods to image the time constant (TC) of elastographic tissue parameters have been recently developed. Elastographic TC images from creep or stress relaxation tests have been shown to provide information on the viscoelastic and poroelastic behavior of tissues. However, the effect of temporal ultrasonic acquisition parameters and input noise on the image quality of the resultant strain TC elastograms has not been fully investigated yet. Understanding such effects could have important implications for clinical applications of these novel techniques. This work reports a simulation study aimed at investigating the effects of varying windows of observation, acquisition frame rate, and strain signal-to-noise ratio (SNR) on the image quality of elastographic TC estimates. A pilot experimental study was used to corroborate the simulation results in specific testing conditions. The results of this work suggest that the total acquisition time necessary for accurate strain TC estimates has a linear dependence to the underlying strain TC (as estimated from the theoretical strain-vs.-time curve). The results also indicate that it might be possible to make accurate estimates of the elastographic TC (within 10% error) using windows of observation as small as 20% of the underlying TC, provided sufficiently fast acquisition rates (>100 Hz for typical acquisition depths). The limited experimental data reported in this study statistically confirm the simulation trends, proving that the proposed model can be used as upper bound guidance for the correct execution of the experiments.

  17. Validation of new 3D post processing algorithm for improved maximum intensity projections of MR angiography acquisitions in the brain

    Energy Technology Data Exchange (ETDEWEB)

    Bosmans, H.; Verbeeck, R.; Vandermeulen, D.; Suetens, P.; Wilms, G.; Maaly, M.; Marchal, G.; Baert, A.L. [Louvain Univ. (Belgium)

    1995-12-01

    The objective of this study was to validate a new post processing algorithm for improved maximum intensity projections (mip) of intracranial MR angiography acquisitions. The core of the post processing procedure is a new brain segmentation algorithm. Two seed areas, background and brain, are automatically detected. A 3D region grower then grows both regions towards each other and this preferentially towards white regions. In this way, the skin gets included into the final `background region` whereas cortical blood vessels and all brain tissues are included in the `brain region`. The latter region is then used for mip. The algorithm runs less than 30 minutes on a full dataset on a Unix workstation. Images from different acquisition strategies including multiple overlapping thin slab acquisition, magnetization transfer (MT) MRA, Gd-DTPA enhanced MRA, normal and high resolution acquisitions and acquisitions from mid field and high field systems were filtered. A series of contrast enhanced MRA acquisitions obtained with identical parameters was filtered to study the robustness of the filter parameters. In all cases, only a minimal manual interaction was necessary to segment the brain. The quality of the mip was significantly improved, especially in post Gd-DTPA acquisitions or using MT, due to the absence of high intensity signals of skin, sinuses and eyes that otherwise superimpose on the angiograms. It is concluded that the filter is a robust technique to improve the quality of MR angiograms.

  18. Influence of different DXA acquisition modes on monitoring the changes in bone mineral density after hip resurfacing arthroplasty.

    Science.gov (United States)

    Hakulinen, Mikko A; Borg, Håkan; Häkkinen, Arja; Parviainen, Tapani; Kiviranta, Ilkka; Jurvelin, Jukka S

    2012-01-01

    Dual-energy X-ray absorptiometry (DXA) is a technique enabling the measurement of bone mineral density (BMD) around prostheses after hip resurfacing arthroplasty (HRA). In this study, we evaluated the consistency of different DXA acquisition modes with 33 patients who had undergone HRA. Patients were scanned with DXA immediately after surgery and at 3-, 6-, and 12-mo time points. All the patients were scanned with dual femur and orthopedic hip acquisition modes and analyzed using 10-region ROI model. With both acquisition modes, a statistically significant decrease (p<0.05, Wilcoxon's test) in BMD at 3mo was revealed in 3 ROIs, located to upper and lateral upper femur. Both acquisition modes detected similarly (p<0.01) preservation of the femoral bone stock within 12mo in all but 1 ROI. The applied acquisition protocols involved the use of different footplates for hip fixation. Because the differences between acquisition modes ranged between +1.6% and -7.1% and the reproducibility of BMD values can vary by as much as 28% due to hip rotation, it is proposed that both dual femur and orthopedic hip acquisition modes can be used to monitor the changes in BMD after HRA. However, the same hip rotation is recommended for all DXA measurements.

  19. United States Program for Technical assistance to IAEA Standards. Concept Paper: Knowledge Acquisition, Skills training for enhanced IAEA safeguards inspections

    Energy Technology Data Exchange (ETDEWEB)

    Morris, F.A.; Toquam, J.L.

    1993-11-01

    This concept paper explores the potential contribution of ``Knowledge Acquisition Skills`` in enhancing the effectiveness of international safeguards inspections by the International Atomic energy Agency (IAEA, or Agency) and identifies types of training that could be provided to develop or improve such skills. For purposes of this concept paper, Knowledge Acquisition Skills are defined broadly to include all appropriate techniques that IAEA safeguards inspectors can use to acquire and analyze information relevant to the performance of successful safeguards inspections. These techniques include a range of cognitive, analytic, judgmental, interpersonal, and communications skills that have the potential to help IAEA safeguards inspectors function more effectively.

  20. United States Program for Technical assistance to IAEA Standards. Concept Paper: Knowledge Acquisition, Skills training for enhanced IAEA safeguards inspections

    Energy Technology Data Exchange (ETDEWEB)

    Morris, F.A.; Toquam, J.L.

    1993-11-01

    This concept paper explores the potential contribution of ``Knowledge Acquisition Skills`` in enhancing the effectiveness of international safeguards inspections by the International Atomic energy Agency (IAEA, or Agency) and identifies types of training that could be provided to develop or improve such skills. For purposes of this concept paper, Knowledge Acquisition Skills are defined broadly to include all appropriate techniques that IAEA safeguards inspectors can use to acquire and analyze information relevant to the performance of successful safeguards inspections. These techniques include a range of cognitive, analytic, judgmental, interpersonal, and communications skills that have the potential to help IAEA safeguards inspectors function more effectively.