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Creator | Title | Description | Subject | Date |
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Sekercioglu, Cagan | A birders quide to Turkey | As I write, it is early December and the woods outside my window lay dusted with snow like a holiday card by Currier and Ives. A minute ago, I looked up and caught a glimpse of an adult Cooper's Hawk dashing swiftly through the trees. It swooped up, landed on a branch, then briefly shook its tail an... | | 2006-01-01 |
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Simpson, Jamesina J. | A novel ELF radar for major oil deposits | This letter proposes a novel extremely low frequency (ELF) radar for major oil deposits. Using our recently developed whole-Earth electromagnetic wave propagation model based upon the finite-difference time-domain method, we have determined that detection of the radial (vertical) component of the sc... | | 2006-01-01 |
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Martin, Jim | Aerodynamic drag area of cyclists determined with field-based measures | Aerodynamic drag is an important factor in the performance of competitive track and road cyclists. Recently we used wind-tunnel testing to validate a practical measure of aerodynamic drag derived from a field test. We present here instructions for performing the field test on a straight flat road or... | | 2006-01-01 |
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Regehr, John | Atomicity and visibility in tiny embedded systems | Visibility is a property of a programming language's memory model that determines when values stored by one concurrent computation become visible to other computations. Our work exploits the insight that in nesC, a C-like language with explicit atomicity, the traditional way of ensuring timely visib... | | 2006-01-01 |
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Mitchell, Joyce A. | Challenges and strategies of the Genetics Home Reference | Objective: This paper focuses on the first two years of operation of Genetics Home Reference (GHR), a Web-based resource <http://www.ghr.nlm.nih.gov> for the general public that helps to explain the health implications of findings from the Human Genome Project. Methods and Findings: Key challenges o... | | 2006-01-01 |
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Couldwell, William T. | Cholesteatoma of the clivus case report | Objective: Cholesteatomas (CNS epidermoids) can be found intradurally or extradurally in the central nervous system. Extradural intraosseous lesions are most commonly found in the petrous bone. Design: Case report Clinical Presentation: The authors describe a unique case of a clival cholesteatoma o... | | 2006-01-01 |
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Gerig, Guido | Closed and open source neuroimage analysis tools and libraries at UNC | The emergence of open-source libraries and development tools in the last decade has changed the process of academic software development in many ways. In medical image processing and visualization this change is especially evident, also because open source projects are actively furthered by grant fu... | | 2006-01-01 |
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Gerig, Guido | Computational anatomy to assess longitudinal trajectory of brain growth | This paper addresses the challenging problem of statistics on images by describing average and variability. We describe computational anatomy tools for building 3-D and spatio-temporal 4-D atlases of volumetric image data. The method is based on the previously published concept of unbiased atlas bui... | | 2006-01-01 |
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Hawkes, Kristen | The derived features of human life history | This chapter compares and contrasts the life histories of extant great apes in order to construct a hypothetical life history of the last common ancestor of all great apes and to identify features of human life history that have been derived during the evolution of our lineage. Data compiled from th... | | 2006-01-01 |
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Regehr, John | Deriving abstract transfer functions for analyzing embedded software | This paper addresses the problem of creating abstract transfer functions supporting dataflow analyses. Writing these functions by hand is problematic: transfer functions are difficult to understand, difficult to make precise, and difficult to debug. Bugs in transfer functions are particularly seriou... | | 2006-01-01 |
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Regehr, John | Efficient type and memory safety for tiny embedded systems | We report our experience in implementing type and memory safety in an efficient manner for sensor network nodes running TinyOS: tiny embedded systems running legacy, C-like code. A compiler for a safe language must often insert dynamic checks into the programs it produces; these generally make progr... | | 2006-01-01 |
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Simpson, Jamesina J. | ELF radar system proposed for localized D-region ionospheric anomalies | This letter proposes a novel extremely low frequency (ELF) radar for localized D-region (altitude < 95 km) ionospheric anomalies that have been generated by natural geophysical processes. The proposed system would use the former U.S. Navy Wisconsin Transmitting Facility as a distant well-characteriz... | | 2006-01-01 |
13 |
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Simpson, Jamesina J. | FDTD modeling of a novel ELF radar for major oil deposits using a three-dimensional geodesic grid of the earth-ionosphere waveguide | This paper reports the first application of an optimized geodesic, three-dimensional (3-D) finite-difference time-domain (FDTD) grid to model impulsive, extremely low-frequency (ELF) electromagnetic wave propagation within the entire Earth-ionosphere cavity. This new model, which complements our pre... | | 2006-01-01 |
14 |
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Gerig, Guido | Fiber tract-oriented statistics for quantitative diffusion tensor MRI analysis | Diffusion tensor imaging (DTI) has become the major modality to study properties of white matter and the geometry of fiber tracts of the human brain. Clinical studies mostly focus on regional statistics of fractional anisotropy (FA) and mean diffusivity (MD) derived from tensors. Existing analysis t... | Diffusion tensor interpolation, Diffusion tensor statistics, DTI analysis, Fiber tract modeling | 2006-01-01 |
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Regehr, John | From the editor: real-time and embedded systems--teaching reliability | Can we teach students to build reliable embedded software? Although it would be rash to say that a general agreement exists on how to teach embedded systems, there's certainly a growing understanding of the issues. For example, the excellent August 2005 issue of ACM Transactions on Embedded Computin... | | 2006-01-01 |
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Mitchell, Joyce A. | Fuzzy measures on the Gene Ontology for gene product similarity | One of the most important objects in bioinformatics is a gene product (protein or RNA). For many gene products, functional information is summarized in a set of Gene Ontology (GO) annotations. For these genes, it is reasonable to include similarity measures based on the terms found in the GO or othe... | | 2006-01-01 |
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Gerig, Guido | Group mean differences of voxel and surface objects via nonlinear averaging | Building of atlases representing average and variability of a population of images or of segmented objects is a key topic in application areas like brain mapping, deformable object segmentation and object classification. Recent developments in image averaging, i.e. constructing an image which is cen... | | 2006-01-01 |
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Gerig, Guido | Images in neuroscience: Fetal and Neonatal Brain Development | In the top row of longitudinal T1-weighted magnetic resonance images of the same child (and same scale), note the dramatic increase in total brain size as well as in white matter intensity over early development. In the bottom row of diffusion tensor images, white matter tractography of a neonate, o... | | 2006-01-01 |
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Hawkes, Kristen | Life history theory and human evolution : a chronicle of ideas and findings | Fertility ends at similar ages in women and female chimpanzees, but humans usually live longer and mature later. We also differ from our closest living relatives in weaning infants before they can feed themselves. The comparisons pose questions about when and why the distinctively human life history... | | 2006-01-01 |
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Harrison, Reid R.;Normann, Richard A. | Low-power integrated circuit for a wireless 100-electrode neural recording system | In the past decade, neuroscientists and clinicians have begun to use implantable MEMS multielectrode arrays (e.g., [1]) to observe the simultaneous activity of many neurons in the brain. By observing the action potentials, or "spikes," of many neurons in a localized region of the brain it is possibl... | Electrode; Multielectrode arrays (MEA); Neural recording; Low-power circuits; Wireless | 2006-01-01 |
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Furse, Cynthia M.; Harrison, Reid R. | Low-power STDR CMOS sensor for locating faults in aging aircraft wiring | A CMOS sensor used to locate intermittent faults on live aircraft wires is presented. A novel architecture was developed to implement the Sequence Time Domain Reflectometry method on a 0.5- m integrated circuit. The sensor locates short or open circuits on active wires with an accuracy of +/-1 ft w... | Aging aircraft wire; CMOS sensors; Fault detection; Pseudo-random noise; Reflectometry methods; Spread spectrum; Wire fault location | 2006-01-01 |
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Regehr, John | Memory safety and untrusted extensions for TinyOS | Sensor network applications should be reliable. However, TinyOS, the dominant sensor net OS, lacks basic building blocks for reliable software systems: memory protection, isolation, and safe termination. These features are typically found in general-purpose operating systems but are believed to be t... | | 2006-01-01 |
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Harrison, Reid R.; Tabib-Azar, Massood | Microcontroller-based wireless recording unit for neurodynamic studies in saltwater | This paper presents the design of a biocompatible implantable neural-recording unit for Aplysia californica, which is a common sea slug. Low-voltage extracellular neural signals (< 250 ?V) are recorded using a high-performance low-power low-noise preamplifier that is packaged with programmable digi... | Sea slug; Data acquisition; Implantable; Low-noise amplifier; Low-power circuits; Neural sensor; Telemetry | 2006-01-01 |
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Furse, Cynthia M. | Modeling and simulation of branched wiring network | The impact of antenna polarization on channel capacity is explored in multiple-input, multiple-output (MIMO) systems. An idealized polarization model involving branch power rations (BPR's) and channel cross-coupling is incorporated into channel-specific capacity calculations. Results are compared f... | | 2006-01-01 |
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Regehr, John | Pluggable abstract domains for analyzing embedded software | Many abstract value domains such as intervals, bitwise, constants, and value-sets have been developed to support dataflow analysis. Different domains offer alternative tradeoffs between analysis speed and precision. Furthermore, some domains are a better match for certain kinds of code than others. ... | | 2006-01-01 |