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1 Mathews, V. John; Clark, Edward B.A mathematical basis for the application of the modified geometric method to maximum frequency estimationAbstract-The application of ultrasound in assessing the fetal cardiovascular system often requires the accurate estimation of maximum blood flow velocity waveforms using Doppler measurements. The modified geometric method estimates the maximum Doppler frequency as the frequency at which the vertica...2004
2 Myers, Chris J.CMOS analog map decoder for (8,4) hamming codeAbstract-Design and test results for a fully integrated translinear tail-biting MAP error-control decoder are presented. Decoder designs have been reported for various applications which make use of analog computation, mostly for Viterbi-style decoders. MAP decoders are more complex, and are necess...2004
3 Stringfellow, Gerald B.; Rieth, Loren W.Effects of Br and Cl on organometallic vapor phase epitaxial growth and ordering in GaInPCuPt ordering in GaInP has significant effects on the electrical and optical properties. In fact, band gap reductions as large as 160 meV are potentially useful for devices. Thus, control of ordering is important. This has led to the investigation of surfactants that affect the surface processes d...Band gap reductions; Surfactants; Surface processes2004
4 Tasdizen, Tolga; Whitaker, Ross T.Higher-order nonlinear priors for surface reconstructionAbstract-For surface reconstruction problems with noisy and incomplete range data, a Bayesian estimation approach can improve the overall quality of the surfaces. The Bayesian approach to surface estimation relies on a likelihood term, which ties the surface estimate to the input data, and the prior...2004
5 Mathews, V. John; Clark, Edward B.Mean frequency estimation of narrowband signalsAbstract-This letter shows that the single frequency approximation for a narrowband lowpass signal embedded in white noise using the Pisarenko harmonic decomposition algorithm is approximately the power-weighted mean frequency of the signal. Experimental results indicate that this method is superio...2004
6 Furse, Cynthia M.New IEEE AP-S education web site: course/lab notes, scholarships, K-12 outreachGreetings from the Snowy West! This month I am pleased to announce a new effort on the part of the IEEE Antennas and Propagation Society Education Committee to collect course and laboratory links relevant to the AP-S community, and compile them in a central location where they can be easily accessed...IEEE AP-S; Education web site; Course notes; Lab notes; K-12 outreach2004
7 Stringfellow, Gerald B.Nitrogen surfactant effects in GaInPThe addition of surfactant nitrogen during the growth of GaInP on 001 GaAs substrates produces significant and interesting changes in the optical and morphological properties of GaInP. In particular, multiple peaks are seen in the low temperature photoluminescence (PL) spectra of GaInP/GaInP:N he...Surfactant nitrogen; Microscopy; Crystals2004
8 Mathews, V. JohnPilot embedding for channel estimation and tracking in OFDM systemsAbstract-We consider the problem of channel estimation and tracking in OFDM systems and explore the idea of adding pilot symbols to the data symbols as a means to conserve bandwidth. The term pilot embedding (PE) is used to refer to this scheme. Compared to the pilot insertion (PI) scheme, i.e., the...2004
9 Mathews, V. John; Varner, Michael W.; Clark, Edward B.Prediction of pregnancy-induced hypertension using coherence analysisABSTRACT This paper presents a novel method to predict hypertensive disorders in pregnancy using coherence analysis. Previous studies suggest that there is inadequate secondary trophoblast invasion in hypertensive pregnancies implying that there are differences in the functional relationships betwe...2004
10 Mathews, V. JohnStochastic mean-square performance analysis of an adaptive Hammerstein filterABSTRACT This paper presents an almost sure (a.s.) mean-square performance analysis of an adaptive Hammerstein filter for the case when the measurement noise in the desired response signal is a martingale difference sequence. The system model consists of a series connection of a memoryless nonlinea...2004
11 Myers, Chris J.Synthesis of speed independent circuits based on decompositionThis paper presents a decomposition method for speedindependent circuit design that is capable of significantly reducing the cost of synthesis. In particular, this method synthesizes each output individually. It begins by contracting the STG to include only transitions on the output of interest and ...2004
12 Stringfellow, Gerald B.Use of Nitrogen to disorder GaInPSignificant changes in microstructure, surface structure, and alloy composition have been observed in GaInP with the addition of nitrogen. These effects occur due to surface changes induced by small concentrations of nitrogen. Transmission electron microscopy and photoluminescence experiments indica...Nitrogen; Alloys; Transmission2004
13 Furse, Cynthia M.Design of implantable microstrip antenna for communication with medical implantsThe objective of this paper is to design a microstrip patch antenna for communication with medical implants in the 402-405-MHz Medical Implant Communications Services band. Microstrip antenna design parameters are evaluated using the finite-difference time-domain method, and are compared to measure...Biocompatible antenna; Medical Implant Communications Services; MICS; Pacemaker antenna; Medical implants2004-08
14 Furse, Cynthia M.Laboratory Project in Wireless FSK Receiver DesignThis paper describes a wireless local area network laboratory project that provides senior and first-year graduate students in microwave engineering courses the opportunity to design, build, and test several passive microstrip components and integrate them into a working system. Students design fil...Microwave engineering; Project-based education2004-02
15 Furse, Cynthia M.Take a Stand: Speaking about RF SafetyTell your students at the beginning of the semester that they need to prepare a speech and deliver it before an off-campus audience, and they will not exactly be leaping out of their seats with joy. Remind them a week in advance that their speech is coming up, and you will inevitably have a student ...Radio frequency safety; RF safety2004-12
16 Furse, Cynthia M.Take a stand: speaking about RF safetyTell your students at the beginning of the semester that they need to prepare a speech and deliver it before an off-campus audience, and they will not exactly be leaping out of their seats with joy. Remind them a week in advance that their speech is coming up, and you will inevitably have a student ...2004-12
17 Harrison, Reid R.Analog MAP decoder for (8,4) hamming code in subthreshold CMOSAn 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; VLSI2004-01-01
18 Khan, Faisal HabibCommercial and industrial applications getting ready for direct-current power distributionThis 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 applications2004-01-01
19 Simpson, Jamesina J.Computational and experimental study of a microwave electromagnetic bandgap structure with waveguiding defect for potential use as a bandpass wireless interconnectAs 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
20 Simpson, Jamesina J.Efficient modeling of impulsive ELF antipodal propagation about the earth sphere using an optimized two-dimensional geodesic FDTD gridThis 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
21 Harrison, Reid R.Local field potential measurement with low-power analog integrated circuitLocal 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; VLSI2004-01-01
22 Harrison, Reid R.Low-power analog VLSI visual collision detectorWe 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 detectors2004-01-01
23 Harrison, Reid R.Low-power FM transmitter for use in neural recording applicationsWe 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
24 Harrison, Reid R.MDAC synapse for analog neural networksEfficient 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 networks2004-01-01
25 Furse, Cynthia M.Robust multicarrier spread spectrum technique for data transmission over partially jammed channelsMulticarrier 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 channels2004-01-01
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