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Clinical otolaryngology: official journal of ENT-UK; official journal of Netherlands Society for Oto-Rhino-Laryngology & Cervico-Facial Surgery 04/2012; 37(2):163-4. · 2.39 Impact Factor
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R Fallows,
K McCoy,
J Hertza,
E Klosson,
B Estes,
I Stroescu,
Cm Salinas,
A Stringer,
S. Aronson,
W Macallister, [......],
T White,
J Gold,
A Vincent,
T Roebuck-Spencer,
A Bowles,
K Gilliland,
A Watts,
F Ahmed,
A Yon,
B Gordon
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ABSTRACT: Objective: The seminal paper on cerebellar cognitive affective syndrome by Schmahmann and Sherman (1998), and subsequent studies, has expanded our understanding of the role of the cerebellum beyond motor functioning to psychological and cognitive functioning. However, many of these studies have examined patients between 1 week and 5 years post-injury and have tended to exclude patients with prior neurological injuries. Thus, the objective of this case study was to examine cerebellar injury in the context of remote traumatic brain injury (TBI) and describe the long-term cognitive, psychological, and psychosocial sequelae of injury in a 33-year-old, right-handed, Caucasian veteran (S.M.). Method: At age 23, S.M. was referred for neuroimaging by psychiatry due to concern that a TBI from age 16 was the cause of recent onset aggressive behavior. Multiple neuroimaging studies showed no neuroanatomical sequelae of TBI, but revealed a right cerebellar arteriovenous malformation (AVM). Embolization resulted in >50% removal of the AVM, but uncovered an intranidal aneurysm. Repeat neuroimaging revealed a large hemorrhage within the cerebellum with the mass effect and hydrocephalus; subsequent treatment resulted in a complicated 5-month hospital stay. Results: Neuropsychological evaluation conducted 10 years after injury revealed deficits in basic attention, working memory, and information processing speed with relatively intact executive functioning and memory. Physical deficits, including ataxia, dysarthria, and spasticity, and psychological difficulties, including impulsivity and low frustration tolerance, were more prominent and caused significant psychosocial distress, impacting interpersonal relationships. Conclusions: This case highlights the cognitive residual of cerebellar injury and the potential long-term impact on psychological and social functioning.
Archives of Clinical Neuropsychology 09/2011; 26(6):470-567. · 2.18 Impact Factor
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R. Ball,
J.R. Beene,
Y. Benhammou,
M. Ben Moshe,
J.W. Chapman,
T. Dai,
E. Etzion,
C. Ferretti,
P.S. Friedman,
D.S. Levin,
Y. Silver,
G. Sherman,
R.L. Varner,
C. Weaverdyck, S. White,
J. Yu,
B. Zhou
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ABSTRACT: Plasma Display Panels (PDP), the underlying engine of panel plasma television displays, are being investigated for their utility as radiation detectors called Plasma Panel Sensors (PPS). The PPS a novel variant of a micropattern radiation detector, is intended to be a fast, high resolution detector comprised of an array of plasma discharge cells operating in a hermetically sealed gas mixture. We report on the PPS development effort, including recent laboratory measurements.
Nuclear Science Symposium Conference Record (NSS/MIC), 2010 IEEE; 12/2010
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ABSTRACT: Faculty invest considerable effort to provide students with formative feedback. Educational research has endorsed the value of a clearly articulated approach when providing student feedback known as `assessment for learning'. In order to ascertain whether claims associated with `assessment for learning' hold true in the engineering disciplines, a three-year study of the deployment of such approaches was undertaken. Preliminary research identified differences in perceptions between staff and students. They showed different understandings of what constitutes feedback, and different expectations of how feedback might be used.
Frontiers in Education Conference (FIE), 2010 IEEE; 11/2010
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ABSTRACT: It seems self-evident that life for teachers would be simplified if there existed a large corpus of relevant resources that was available for them to reuse and for inquisitive students to download. The learning object community has worked for the past decade and more to provide the necessary infrastructure, standards, and specifications to facilitate such beneficial activity, but the take-up has been disappointingly small, particularly in University and Higher Education, which is the subject of this research. The problem has been that practitioners have not deposited their teaching resources, or have not made them openly available, in the quantity that would achieve critical mass for uptake. EdShare and the Language Box are two initiatives that have concentrated on the issue of facilitating and improving the practice of sharing, the former in an institutional setting and the latter in a subject community of practice. This paper describes and analyzes the motivations for these projects, the design decisions they took in implementing their repositories, the approaches they took to change agency and practice within their communities, and the changes, in practice, that have so far been observed. The contribution of this paper is an improved understanding of how to encourage educational communities to share.
IEEE Transactions on Learning Technologies 07/2010; · 0.82 Impact Factor
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ABSTRACT: Nuclear materials that pose a homeland security threat typically have high atomic numbers (Z > 82). It is of vital importance to develop smart, efficient, and inexpensive systems to detect such high-Z materials without opening a container. Muon Tomography (MT) provides a non-invasive channel for such investigation. We have been investigating such muon scattering with numerical simulation with GEANT4 for some time [6]. In this article we report the development of an efficient clustering algorithm for detecting threat objects in a probed volume.
Nuclear Science Symposium Conference Record (NSS/MIC), 2009 IEEE; 12/2009
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ABSTRACT: The goal of this project is to develop a training system that can simulate the welding process in real-time and give feedback that avoids learning wrong motion patterns for beginning welders and can be used to analyze the process by the teacher afterwards. The system is based mainly on COTS components. A standard PC with a Dual-core CPU and a medium-end nVidia graphics card is sufficient. Input is done with a regular welding gun to allow realistic training. The gun is tracked by an OptiTrack system with 3 FLEX:V100 cameras. The same is also used to track a regular welding helmet to get accurate eye positions for display, which was chosen over glasses for robustness. The display itself is a Zalman Trimon stereo monitor that is laid out horizontally. The software is designed around a main simulation component for solving heat conduction on a grid of simulation points based on local GaussSeidel elimination.
Virtual Reality Conference, 2009. VR 2009. IEEE; 04/2009
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ABSTRACT: Shake menus are a novel method for activating, displaying, and selecting options presented relative to a tangible object or manipulator in a 3D user interface. They provide ready-to-hand interaction, including facile selection and placement of objects. We present the technique, several alternative methods for presenting shake menus (world-referenced, display-referenced, and object-referenced), and an evaluation of menu placement.
3D User Interfaces, 2009. 3DUI 2009. IEEE Symposium on; 04/2009
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ABSTRACT: Finding effective means of meeting students' varied needs during introductory programming classes is a perpetual challenge. Maintaining motivation and a sufficient level of engagement across an undergraduate group with diverse prior experience is not a simple task. Claims for successful approaches include forms of differentiated teaching and paired programming. Competitions run by professional bodies and the software industry are often used to provide further external motivation. This paper presents the outcomes of a collaborative initiative across four universities which drew on aspects of both these approaches. Academics in the partner institutions had already implemented specific practice to accommodate the variety of student needs. The TOPS project was designed to involve and extend students through the processes of devising and competing in an inter-university challenge. Analysis of the outcomes has enabled the development of further understanding and good practice in this important area.
Frontiers In Education Conference - Global Engineering: Knowledge Without Borders, Opportunities Without Passports, 2007. FIE '07. 37th Annual; 11/2007
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E. Myers,
K. Hess,
Zhizhang Yang,
Jiangtao Xu,
A. Wong,
D. Doyle,
J. Woolard, S. White,
Bang Le,
S. Gill,
G. Hovis
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ABSTRACT: VDatum is a software tool being developed by the National Ocean Service that allows users to vertically transform geospatial data among a variety of ellipsoidal, orthometric and tidal datums. This is important to coastal applications that rely on vertical accuracy in bathymetric, topographic, and coastline data sets. The VDatum software can be applied to a single point location or to a batch data file. Applying VDatum to an entire data set can be particularly useful when merging multiple data sources together, where they must first all be referenced to a common vertical datum. Contemporary technologies, such as lidar and kinematic GPS data collection, can also benefit from VDatum in providing new approaches for efficiently processing shoreline and bathymetric data with accurate vertical referencing. VDatum is currently available for Tampa Bay, New York Bight, Delaware Bay, Louisiana's Calcasieu River and Lake Charles, central California, Puget Sound, Strait of Juan de Fuca, and north/central North Carolina. In addition, VDatum development is near completion for Chesapeake Bay, Mobile Bay to Cape San Bias, Southern California, Long Island Sound and New York Harbor, and projects are also commencing for an area from New Orleans to Mobile Bay, the Gulf of Maine and the Pacific Northwest. Given the numerous applications that can benefit from having a vertical datum transformation tool, the goal is to develop a seamless nationwide VDatum utility that would facilitate more effective sharing of vertical data and also complement a vision of linking such data through national elevation and shoreline databases.
OCEANS 2007; 11/2007
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ABSTRACT: The dynamic nature of sediments, from rivers to estuaries and the sea, calls for a holistic approach to sediment management
that ensures that transport, quantity and quality are explicitly addressed throughout the framework. If sediments are hydrodynamically
connected, it makes sense to prioritize those that pose risk downstream, and to do this in a manner that considers the entire
sediment,contaminant and risk budget, from source to sink. Such an approach will provide insight into the highest impact potential
changes in agricultural, industrial and development practices that may reduce sediment and contaminant inputs, and hence the
cost of maintaining waterways and protecting the environment.Conceptual frameworks for basin-scale sediment management that
provide an approach for addressing the complexities inherent in managing sediments at both a basin-wide and site-specific
scale and their role in holistic European basin-scale sediment management decision making, are discussed.
05/2007: pages 85-96;
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ABSTRACT: Many different teaching methods are used to support learning in higher education. Research into the relationship between the knowledge traditions of fields of study and their most appropriate teaching methods identifies clear differences between the appropriate which are the most suitable in different disciplines. Increasingly, blended approaches to education are being introduced, integrating e-learning with face-to face methods. However, major influences on our understanding of the potential of e-learning have come from psychological and educational perspectives, which are not, of themselves, clearly associated with specific disciplinary needs. This paper identifies e-learning approaches which particularly suit specific disciplinary preferences. It surveys students to identify methods which they believe are particularly relevant to their studies. Their responses support the case for taking a disciplinary perspective when developing blended approaches
Frontiers in Education Conference, 36th Annual; 12/2006
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ABSTRACT: Magnetically Induced Motion Imaging (MIMI) uses an oscillating magnetic field and ultrasonic motion-tracking techniques to vibrate and identify brachytherapy seeds in situ. The efficacy of the technique relies on the ability to generate and detect seed vibration, and distinguish this vibration signal from other motion sources. The vibration of the seed depends on the torque generated by a ferromagnetic core in the seed. A design goal is to maximize the torque for the limited amount of core material that can be placed within a seed. We have developed 3D finite-element models for two seed core geometries, an ellipsoid and a rod capped by two semi-hemispheres. Both seed cores have identical volumes (7.4times10<sup>-10</sup>m<sup>3</sup> ), length (4mm), and permeability (mu<sub>r</sub>=4000). Calculation by the Maxwell Stress Tensor method yields a torque for the rod 1.4 times that of the ellipsoidal core, demonstrating the substantial sensitivity of torque on core geometry. The oscillating seeds act as dipole shear wave sources, with maximum vibration amplitude at the ends of the seed and a vibration minimum at the center of length. This gives rise to a characteristic vibration amplitude distribution in the surrounding tissue, with two lobes per seed. By taking advantage of the opposing phase of the seed ends, we demonstrate a method that links these lobes. A compounding technique for suppressing ring-down artifact is demonstrated. These methods are demonstrated on RF data acquired from seeds in beef muscle tissue. 3D vibration isosurface maps of seed vibration amplitude are presented and found to be in good agreement with previously reported simulations
Ultrasonics Symposium, 2006. IEEE; 11/2006
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G. Agarwal,
P. Belhumeur,
S. Feiner,
D. Jacobs,
W.J. Kress,
R. Ramamoorthi,
N.A. Bourg,
N. Dixit,
H. Ling,
D. Mahajan,
R. Russell,
S. Shirdhonkar,
K. Sunkavalli, S. White
Taxon. 08/2006; 55(3-55):597-610.
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B. Spence, S. White,
A. Jones,
J. Wachholz,
N. Wilder,
P. Cronin,
T. Gregory,
P. Barker,
T. Allmandinger,
N. Mardesich,
M. Piszczor,
P. Sharps,
N. Fatemi
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ABSTRACT: ATK space systems (ATK) in collaboration with the NASA Glenn Research Center (GRC), the Jet Propulsion Laboratory (JPL), and EMCORE Photovoltaics (EPV), is executing NASA's New Millennium Program (NMP) Space Technology 8 (ST8) Project Formulation Refinement Phase to develop and validate through spaceflight a state-of-the-art solar array system called UltraFlex-175. UltraFlex-175 is a highly evolved and scaled version of the previously flight qualified Mars 01-Lander UltraFlex and employs many advanced technologies. The UltraFlex-175 system promises very high specific power (175 W/g - 220 W/kg BOL), compact stowage volume (>33 kW/m<sup>3</sup>), high reliability, scalability beyond 7 kW wing sizes, and operational capability for standard, high voltage, multi A.U., and/or high temperature applications. Key technology maturation activities performed (deployment kinematics, deployed dynamics, and power production/survivability) that demonstrate TRL 5-6 achievement will be presented. Subsystem and system level design, development, experimental hardware builds, conducted testing and results, and analytical model correlation activities will be presented. Technology scale-up performance to 7 kW wing sizes and the planned UltraFlex-1 75 flight experiment will also be presented
Photovoltaic Energy Conversion, Conference Record of the 2006 IEEE 4th World Conference on; 06/2006
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B. Spence, S. White,
N. Wilder,
T. Gregory,
M. Douglas,
R. Takeda,
N. Mardesich,
T. Peterson,
B. Hillard,
P. Sharps,
N. Fatermi
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ABSTRACT: ABLE Engineering, Inc. (ABLE), in collaboration with the NASA Glenn Research Center (GRC), Jet Propulsion Laboratory (JPL), and EMCORE Photovoltaics (EPV), has been selected for the NASA New Millennium Program (NMP) Space Technology 8 (ST8) Study Phase project to develop and potentially flight validate a state-of-the-art solar array system called: "next generation UltraFlex" NGU is a highly evolved and scaled version of the previously flight qualified Mars 01-Lander UltraFlex and employs many advanced technologies. The NGU system promises very high specific power (175 W/g - 220 W/kg BOL), compact storage volume (>33 kW/m<sup>3</sup>), high reliability, scalability beyond 7 kW wing sizes, and operational capability for standard, high voltage, multi-A.U., and/or high temperature applications. Key technology maturation activities performed (deployment kinematics, deployed dynamics, and power production/survivability) that demonstrate TRL 4+ achievement will be presented. NGU design, development, analysis, and hardware activities are presented. NGU subsystem and system level experimental tests/results and model correlation will be presented. NGU technology scale-up performance to 7 kW wing sizes will also be addressed.
Photovoltaic Specialists Conference, 2005. Conference Record of the Thirty-first IEEE; 02/2005
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ABSTRACT: NOAA has recently significantly increased its commitment to promoting environmental literacy by adopting this effort as a strategic crosscutting priority, forming an Office of Education and Sustainable Development, and creating an Education Council. Another of NOAA’s strategic crosscutting priorities is integrating global environmental observations and data management. NOAA possesses a vast array of observing systems that monitor oceanic, atmospheric, and terrestrial parameters. The streaming data from these systems offers broad opportunities to create real-time visualizations of dynamic Earth processes and to capture rare and spectacular events that occur on regional or global geographic scales. Making these visualizations available and understandable by the general public is a tall task. The potential return on investment, however, is large. By enabling the public to observe environmental processes and long-term trends occurring in their “backyards” and demonstrating the link these “backyard” processes have to global processes, we can build an environmentally literate public that makes more informed decisions. Also, it is well known that the general public has a keen interest in rare or spectacular natural events. Significant learning can occur when we can capitalize on the public’s piqued interest about these phenomena. This curiosity-driven quest for information was made dramatically obvious with the Indonesian tsunami in 2004. NOAA’s Education Council realizes the educational potential that observing system data offer and has adopted Earth Observing Systems Education as a top priority.
OCEANS, 2005. Proceedings of MTS/IEEE; 02/2005
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ABSTRACT: As flexible thin film photovoltaic (FTFPV) cell technology is developed for space applications, integration into a viable solar array structure that optimizes the attributes of this cell technology is critical. An advanced version of ABLE's UltraFlex solar array platform represents a near-term, low-risk approach to demonstrating outstanding array performance with the implementation of FTFPV technology. Recent studies indicate that an advanced UltraFlex solar array populated with 15% efficient thin film cells can achieve over 250 W/kg BOL. An overview of the status of hardware development and the future potential of this technology is presented.
Photovoltaic Energy Conversion, 2003. Proceedings of 3rd World Conference on; 06/2003
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ABSTRACT: The objective of this study was to assess the potential of remote sensing from satellites for monitoring forest re danger in northern Canadian boreal forests. In Canada, daily forest re danger is rated by the Canadian Forest Fire Danger Rating System (CFFDRS). One of its components is the Fire Weather Index (FWI) system. FWI variables were computed from weather records of the 1994 re season. They were correlated to NDVI and cumulative NDVI (SNDVI) data computed from NOAA-AVHRR red and near-infrared bands in the case of coniferous stands located in the Northwest Territories, Canada. NDVI and SNDVI data were more strongly correlated to FWI variables corresponding to slow-drying fuels, i.e. duV moisture code (DMC), drought code (DC) and buildup index (BUI), than to those related to fast-drying fuels, i.e. ne fuel moisture code (FFMC) and re weather index (FWI). The correlations between spectral data and FWI variables were explained by the fact that both kinds of variables have a similar seasonal variation, but not by an eventual direct relationship between NDVI and fuel moisture conditions, since NDVI is more directly related to chlorophyllian activity of the vegetation than to droughtness conditions.
int. j. remote sensing. 01/2001; 22:2839-2846.
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ABSTRACT: Oil and gas pipelines often display a bulk magnetic easy magnetization direction, and this may influence results obtained during magnetic nondestructive evaluation. The origin of this magnetic easy axis is not well known. Earlier work [L. Clapham, C. Heald, T. Krause, and D. L. Atherton, J. Appl. Phys. 86, 1574 (1999)] speculated that it was a result of residual stresses introduced during pipeline manufacturing, specifically cold bending. This article reports a study in which a magnetic Barkhausen noise technique is used to follow the development of a magnetic easy axis in a steel plate sample subjected to progressive amounts of cold bending. © 2000 American Institute of Physics.
Journal of Applied Physics 09/2000; · 2.17 Impact Factor
