Filters: Date: "2004-01-01" Collection: ir_uspace
1 - 25 of 23
| Creator | Title | Description | Subject | Date | ||
|---|---|---|---|---|---|---|
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Gerig, Guido | Abnormal vessel tortuosity as a marker of treatment response of malignant gliomas: preliminary report | Despite multiple advances in medical imaging, noninvasive monitoring of therapeutic efficacy for malignant gliomas remains problematic. An underutilized observation is that malignancy induces characteristic abnormalities of vessel shape. These characteristic shape abnormalities affect both capillari... | 2004-01-01 | |
| 2 |
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Harrison, Reid R. | Analog MAP decoder for (8,4) hamming code in subthreshold CMOS | An all-MOS analog tail-biting MAP decoder is presented for an (8,4) Hamming code. The decoder implements a probability propagation algorithm using subthreshold CMOS networks. Physical results verify the expected behavior of the decoder and demonstrate robustness of analog decoding circuits. | MAP decoder; Hamming code; VLSI | 2004-01-01 |
| 3 |
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Kestle, John R. W. | Assessing the validity of the endoscopic shunt insertion trial: did surgical experience affect the results? | Object. Most surgical procedures are associated with a learning curve in which the success rate is lower early in the experience before mistakes have been identified and modifications made to the procedure. Negative results obtained early in a trial's learning curve may be a matter of timing rather ... | Endoscopic shunt insertion; Ventriculoperitoneal shunt; Pediatric neurosurgery; Surgical experience | 2004-01-01 |
| 4 |
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Khan, Faisal Habib | Commercial and industrial applications getting ready for direct-current power distribution | This paper describes design trends in several classes of power-electronic appliances that will increase the appeal for distributing dc power in buildings. In the commercial sector information technology (IT) power conversion architectures are moving from multi- to single-voltage supplies, initially... | Direct current power distribution; Commercial applications | 2004-01-01 |
| 5 |
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Simpson, Jamesina J. | Computational and experimental study of a microwave electromagnetic bandgap structure with waveguiding defect for potential use as a bandpass wireless interconnect | As clock rates continue to rise, problems with signal integrity, cross-coupling, and radiation may render impractical the baseband metallic interconnects presently used in computers. A potential means to address this problem is to use bandpass wireless interconnects operating at millimeter-wave cent... | 2004-01-01 | |
| 6 |
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Mitchell, Joyce A. | Design and evaluation of a personal digital assistant-based alerting service for clinicians | Purpose: This study describes the system architecture and user acceptance of a suite of programs that deliver information about newly updated library resources to clinicians' personal digital assistants (PDAs). Description: Participants received headlines delivered to their PDAs alerting them to new... | 2004-01-01 | |
| 7 |
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Regehr, John | Dynamic CPU management for real-time, middleware-based systems | Many real-world distributed, real-time, embedded (DRE) systems, such as multi-agent military applications, are built using commercially available operating systems, middleware, and collections of pre-existing software. The complexity of these systems makes it difficult to ensure that they maintain h... | 2004-01-01 | |
| 8 |
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Simpson, Jamesina J. | Efficient modeling of impulsive ELF antipodal propagation about the earth sphere using an optimized two-dimensional geodesic FDTD grid | This letter reports the initial application of a geodesic finite-difference time-domain (FDTD) grid to model impulsive extremely low frequency electromagnetic wave propagation about the Earth sphere. The two-dimensional transverse-magnetic grid is comprised entirely of hexagonal cells, except for a ... | 2004-01-01 | |
| 9 |
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Mitchell, Joyce A. | Evidence-based retrieval in evidence-based medicine | Objective: Clinical decisions based on a meta-analysis that is based on an ineffective retrieval strategy may have serious negative consequences for patients. The study objective was to investigate the extent to which meta-analyses report proof of their retrieval strategies' effectiveness. Methods: ... | 2004-01-01 | |
| 10 |
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Hawkes, Kristen | The grandmother effect | Why do women live long past the age of child-bearing? Contrary to common wisdom, this phenomenon is not new, and is not due to support for the elderly. Rather, grannies have a lot to offer their grandchildren. | 2004-01-01 | |
| 11 |
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Harrison, Reid R. | Local field potential measurement with low-power analog integrated circuit | Local field potentials (LFPs) in the brain are an important source of information for basic research and clinical (i.e., neuroprosthetic) applications. The energy contained in certain bands of LFPs in the 10-100 Hz range has been shown to correlate with specific arm movement parameters in nonhuman ... | Local field potentials; Neural recording; Low-power circuit design; Neural prosthesis; VLSI | 2004-01-01 |
| 12 |
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Harrison, Reid R. | Low-power analog VLSI visual collision detector | We have designed and tested a single-chip analog VLSI sensor that detects imminent collisions by measuring radially expansive optic flow. The design of the chip is based on a model proposed to explain leg-extension behavior in flies during landing approaches. A new elementary motion detector (EMD) c... | VLSI; Visual collision detection; Elementary motion detectors | 2004-01-01 |
| 13 |
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Harrison, Reid R. | Low-power FM transmitter for use in neural recording applications | We present a low power FM transmitter for use in neural recording telemetry. The transmitter consists of a low noise biopotential amplifier and a voltage controlled oscillator used to transmit the amplified neural signals at a frequency of 433 MHz. The circuit is powered through a transcutaneous,... | RF telemetry; Transmitter; Neural recording; Low power circuits; Multielectrode arrays; Voltage controlled oscillator (VCO) | 2004-01-01 |
| 14 |
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Harrison, Reid R. | MDAC synapse for analog neural networks | Efficient weight storage and multiplication are important design challenges which must be addressed in analog neural network implementations. Many schemes which treat storage and multiplication separately have been previously reported for implementation of synapses. We present a novel synapse c... | Multiplying digital-to-analog converter; MDAC synapse; Analog neural networks | 2004-01-01 |
| 15 |
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Broughton, John | Pristine benchmarks and indigenous conservation? Implications from California zooarchaeology | The superabundance of tame wildlife during the early historic period in California astonished European explorers. And the historic accounts of incredible animal densities, most notably artiodactyls, have influenced a long-held perception that California Indians lived in harmony with nature. However,... | 2004-01-01 | |
| 16 |
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Zhdanov, Michael | Quasi-analytical boundary condition for three-dimensional finite difference electromagnetic modeling | Numerical modeling of the quasi-static electromagnetic (EM) field in the frequency domain in a three-dimensional (3-D) inhomogeneous medium is a very challenging problem in computational physics. We present a new approach to the finite difference (FD) solution of this problem. The FD discretization ... | 2004-01-01 | |
| 17 |
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Furse, Cynthia M. | Robust multicarrier spread spectrum technique for data transmission over partially jammed channels | Multicarrier spread spectrum (MC-SS) is an altemative to the conventional spread spectrum (SS) techniques that behaves significantly better when the system is subject to narrow- or partial-band interference. However; successful implementation of the optimum detector requires knowledge of noise ... | Multicarrier spread spectrum; MC-SS; Jamming; Jammed channels | 2004-01-01 |
| 18 |
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Harrison, Reid R. | Single-chip CMOS visual orientation sensor | We present a single-chip, low-power vision sensor capable of measuring local edge orientation across a wide field of view. The sensor was fabricated in a 0.5-µm CMOS process. Quadratic spatial filters were implemented using differential pairs and an "antibump" circuit to give a current-mode out... | Low-power; Vision sensor; CMOS | 2004-01-01 |
| 19 |
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Freire, Juliana | Siphoning hidden-web data through keyword-based interfaces | In this paper, we study the problem of automating the retrieval of data hidden behind simple search interfaces that accept keyword-based queries. Our goal is to automatically retrieve all available results (or, as many as possible). We propose a new approach to siphon hidden data that automatically ... | 2004-01-01 | |
| 20 |
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Simpson, Jamesina J. | Three-dimensional FDTD modeling of impulsive ELF propagation about the earth-sphere | This paper reports the application of an efficient finite-difference time-domain (FDTD) algorithm to model impulsive extremely low frequency (ELF) propagation within the entire Earth-ionosphere cavity. Periodic boundary conditions are used in conjunction with a three-dimensional latitude-longitude F... | 2004-01-01 | |
| 21 |
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Gerig, Guido | Unbiased diffeomorphic atlas construction for computational anatomy | Construction of population atlases is a key issue in medical image analysis, and particularly in brain mapping. Large sets of images are mapped into a common coordinate system to study intra-population variability and inter-population differences, to provide voxel-wise mapping of functional sites, a... | 2004-01-01 | |
| 22 |
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Harrison, Reid R. | Validation of adaptive threshold spike detector for neural recording | We compare the performance of algorithms for automatic spike detection in neural recording applications. Each algorithm sets a threshold based on an estimate of the background noise level. The adaptive spike detection algorithm is suitable for implementation in analog VLSI; results from a proof-of-... | Spike detection; Neural recording; Ation potential; VLSI | 2004-01-01 |
| 23 |
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Harrison, Reid R.; Tabib-Azar, Massood | Wireless multi-channel sensor for neurodynamic studies | This paper presents the design of a bio-compatible, implantable neural recording device for Aplysia californica, a common sea slug. Low-voltage extracellular neural signals (<100 μV) are recorded using a high-performance, low-power, low-noise preamplifier that is integrated with programmable data a... | Implantable; Data acquisition; Neural recording; Neural signals; Telemetry; Low-power circuits; Low-noise amplifier; Sea slug | 2004-01-01 |
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