UScholar Works
 
Filters: Department: "Electrical & Computer Engineering" Collection: "ir_uspace"
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CreatorTitleDescriptionSubjectDate
251 Simpson, Jamesina J.Two-dimensional FDTD model of antipodal ELF propagation and schumann resonance of the earthThis letter reports the initial application of the finitedifference time-domain (FDTD) method to model extremely lowfrequency (ELF) propagation around the entire Earth. Periodic boundary conditions are used in conjunction with a variable-cell two-dimensional TM FDTD grid, which wraps around the comp...2002-01-01
252 Harrison, Reid R.CMOS imager with on-chip temporal filtering for motion pre-processingRobust motion detection algorithms such as the motion energy model require temporal filtering at the pixel level. We have designed and tested a CMOS imager with integrated, pixel-level temporal filtering necessary for motion detection. This temporal filtering enhances transients and provides a ...2002-01-01
253 Harrison, Reid R.Wide-linear-range subthreshold CMOS transconductor employing the back-gate effectWe present a CMOS circuit that utilizes the back-gate effect to extend the linear range of a subthreshold MOS transconductor. Previous designs of wide-linear-range transconductors using bipolar transistors employed multiple differential pairs with input offset voltages used to shift the individ...2002-01-01
254 Harrison, Reid R.Low-power, low-noise CMOS amplifier for neural recording applicationsThere is a need among scientists and clinicians for lownoise, low-power biosignal amplifiers capable of amplifying signals in the mHz to kHz range while rejecting large dc offsets generated at the electrode-tissue interface. The advent of fully-implantable multielectrode arrays has created the nee...2002-01-01
255 Stringfellow, Gerald B.Effect of surfactant Sb on carrier lifetime in GaInP epilayersSamples of Ga0.52In0.48P grown on (001) GaAs with small amounts of surfactant Sb were investigated using time-resolved photoluminescence. All samples show a luminescence that may be fit to a two-stage exponential decay with a fast and a slow lifetime. For growth without Sb (Sb/III(v)(0), the sample ...Semiconductor ternary alloys; Epitaxial layer; Microstructures2002-01-01
256 Furse, Cynthia M.Inexpensive distance measuring system for location of robotic vehiclesAn distance-measuring system based on a swept frequency reflectometer radar system was built and tested for application to navigation of robotic vehicles in a sealed room where GPS signals are not available. The final system built en masse would cost approximately $25. The system was simulated using...Swept frequency reflectometer radar system; Robotic vehicles2002-04-20
257 Stevens, KennethEnergy and performance models for clocked and asynchronous communicationParameterized first-order models for throughput, energy, and bandwidth are presented in this paper. Models are developed for many common pipeline methodologies, including clocked flopped, clocked time-borrowing latch protocols, asynchronous two-cycle, four-cycle, delay-insensitive, and source synch...2003
258 Tasdizen, Tolga; Whitaker, Ross T.Particle-based simulation of fluidsDue to our familiarity with how fluids move and interact, as well as their complexity, plausible animation of fluids remains a challenging problem. We present a particle interaction method for simulating fluids. The underlying equations of fluid motion are discretized using moving particles and th...2003
259 Tasdizen, Tolga; Whitaker, Ross T.Feature preserving variational smoothing of terrain dataIn this paper, we present a novel two-step, variational and feature preserving smoothing method for terrain data. The first step computes the field of 3D normal vectors from the height map and smoothes them by minimizing a robust penalty function of curvature. This penalty function favors piecewise ...2003
260 Myers, Chris J.Verification of timed circuits with failure directed abstractionsThis paper presents a method to address state explosion in timed circuit verification by using abstraction directed by the failure model. This method allows us to decompose the verification problem into a set of subproblems, each of which proves that a specific failure condition does not occur. To...2003
261 Mathews, V. John; Varner, Michael W.; Clark, Edward B.Robust estimation of fetal heart rate variability using doppler ultrasoundAbstract-This paper presents a new measure of heart rate variability (HRV) that can be estimated using Doppler ultrasound techniques and is robust to variations in the angle of incidence of the ultrasound beam and the measurement noise. This measure employs the multiple signal characterization (MUSI...2003
262 Stevens, KennethRelative timingAbstract-Relative timing (RT) is introduced as a method for asynchronous design. Timing requirements of a circuit are made explicit using relative timing. Timing can be directly added, removed, and optimized using this style. RT synthesis and verification are demonstrated on three example circuits,...2003
263 Myers, Chris J.Effcient verification of hazard-freedom in gate-level timed asynchronous circuitsThis paper presents an efficient method for verifying hazard freedom in timed asynchronous circuits. Timed circuits are a class of asynchronous circuits that utilize explicit timing information fur optimization throughout the entire design process. In asynchronous circuits, correct operation require...2003
264 Tasdizen, Tolga; Whitaker, Ross T.Curvature-based transfer functions for direct volume rendering: methods and applicationsDirect volume rendering of scalar fields uses a transfer function to map locally measured data properties to opacities and colors. The domain of the transfer function is typically the one-dimensional space of scalar data values. This paper advances the use of curvature information in multi-dimensio...2003
265 Furse, Cynthia M.Teaching and learning combined (TLC)Most professors have to lean a LOT. Every day, it seems, there IS something that we need that we don't know. So what do you do to lean this new information? Perhaps you hit the Web or the library, find a tutorial, a textbook, or a paper, and give it a little reading time in between a 12:00 class an...2003
266 Tasdizen, Tolga; Whitaker, Ross T.Anisotropic diffusion of surface normals for feature preserving surface reconstructionFor 3D surface reconstruction problems with noisy and incomplete range data measure d from complex scenes with arbitrary topologies, a low-level representation, such as level set surfaces, is used. Such surface reconstruction is typically accomplished by minimizing a weighted sum of data-model discr...2003
267 Mathews, V. John; Clark, Edward B.Robust estimation of fetal heart rate variability using doppler ultrasoundABSTRACT Heart rate variability (HRV) provides important information about the development of the cardiovascular system in fetuses. This paper presents a new measure of fetal HRV that can be estimated using Doppler ultrasound techniques. This measure employs the multiple signal characterization (MU...2003
268 Mathews, V. JohnBlind identification of bilinear systemsAbstract-This paper is concerned with the blind identification of a class of bilinear systems excited by non-Gaussian higher order white noise. The matrix of coefficients of mixed input-output terms of the bilinear system model is assumed to be triangular in this work. Under the additional assumptio...2003
269 Tasdizen, Tolga; Whitaker, Ross T.Anisotropic diffusion of surface normals for feature preserving surface reconstructionFor 3D surface reconstruction problems with noisy and incomplete range data measured from complex scenes with arbitrary topologies, a low-level representation, such as level set surfaces, is used. Such surface reconstruction is typically accomplished by minimizing a weighted sum of data-model discre...2003
270 Harrison, Reid R.Custom multielectrode array with integrated low-noise preamplifiersMultielectrode arrays (MEAs) have emerged as a leading technology for extracellular neural recording and stimulation. Their large number of recording sites promises to yield important insight into neural systems. As the density of recording sites increases, interfacing to each electrode becomes inc...Electrode; Multielectrode arrays (MEA); Neural recording; Extracellular recording; Low-noise2003-01-01
271 Harrison, Reid R.; Charles, Cameron TownleyFloating gate common mode feedback circuit for low noise amplifiersMost low noise amplifier designs focus on eliminating sources of noise that are intrinsic 1.0 the amplifier (thermal noise, Ilfnoise). As integrated (circuit design moves increasingly towards mixed signal implementations, the design of low-noise malog amplifiers must be re-evaluated to consider th...Floating gate; Common mode feedback circuit; Low noise amplifiers2003-01-01
272 Furse, Cynthia M.Non-destructive fault location on aging aircraft wiring networks, Part 2- live wires in flightAging aircraft wiring has been identified as an area of critical national concern. As the system ages, the wires become brittle and crack, break, or develop short circuits. Short circuits, in particular, have been implicated in a variety of smoke incidents, in-flight fires, and crashes. Some of thes...2003-01-01
273 Harrison, Reid R.Low-power integrated circuit for adaptive detection of action potentials in noisy signalsThe advent of microelectrode arrays allowing for the simultaneous recording of 100 or more neurons is leading to significant advances in science and medicine. However, the amount of data generated by these arrays presents a technical challenge if these systems are ever to be fully implanted for n...Low-power; Spike detection; Neural recording; Low-power circuit design; Neuroprosthesis; CMOS2003-01-01
274 Furse, Cynthia M.Frequency-domain reflectometery for on-board testing of aging aircraft wiringAging aircraft wiring poses a significant safety threat and has been implicated in losses of both military and commercial aircraft. This paper describes the conceptual design and function of a "smart wiring system" based on a low-cost frequency-domain reflectometer (FDR) that can be used to test th...Frequency domain reflectometry; Aging wiring; On board testing2003-05
275 Harrison, Reid R.Low-power low-noise CMOS amplifier for neural recording applicationsThere is a need among scientists and clinicians for low-noise low-power biosignal amplifiers capable of amplifying signals in the millihertz-to-kilohertz range while rejecting large dc offsets generated at the electrode-tissue interface. The advent of fully implantable multielectrode arrays has cre...Bioamplifier; Analog integrated circuits; Biosignal amplifier; Low noise; Low-power circuit design; Neural recordings; Neural amplifier; Noise efficiency factor; Subthreshold circuit design; Weak inversion2003-06
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