UScholar Works
 
Filters: Department: "Electrical & Computer Engineering" Collection: "ir_uspace"
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CreatorTitleDescriptionSubjectDate
1 Mathews, V. John; Dubow, JoelA stable adaptive Hammerstein filter employing partial orthogonalization of the input signalsAbstract This paper presents an algorithm that adapts the parameters of a Hammerstein system model. Hammerstein systems are nonlinear systems that contain a static nonlinearity cascaded with a linear system. In this work, the static nonlinearity is modeled using a polynomial system and the linear f...2002
2 Harrison, Reid R.; Myers, Chris J.; Schlegel, ChristianAnalog decoding of product codesA method is presented for analog softdecision decoding of block product codes (block turbo codes). Extrinsic information is exchanged as analog signals between component row and column decoders. The component MAP decoders use low-power analog computation in subthreshold CMOS circuits to implement th...2002
3 Myers, Chris J.; Harrison, Reid R.; Schlegel, ChristianAnalog decoding of product codesAbstract - A method is presented for analog softdecision decoding of block product codes (block turbo codes). Extrinsic information is exchanged as analog signals between component row and column decoders. The component MAP decoders use low-power analog computation in subthreshold CMOS circuits t...2002
4 Myers, Chris J.Automatic derivation of timing constraints by failure analyisAbstract. This work proposes a technique to automatically obtain timing constraints for a given timed circuit to operate correctly. A designated set of delay parameters of a circuit are first set to sufficiently large bounds, and verification runs followed by failure analysis are repeated. Each ver...2002
5 Harrison, Reid R.; Myers, Chris J.; Schlegel, ChristianCell library for automatic synthesis of analog error control decodersThis paper presents a cell library for automatic synthesis of analog error control decoders. By using some basic cells, analog ermr control decoders can be automatically synthesized. Also, using automatic synthesis based on this cell library, the circuit performance is not degraded and the circuit i...2002
6 Myers, Chris J.; Harrison, Reid R.; Schlegel, ChristianCell library for automatic synthesis of analog error control decodersThis paper presents a cell library for automatic synthesis of analog error control decoders. By using some basic cells, analog ermr control decoders can be automatically synthesized. Also, using automatic synthesis based on this cell library, the circuit performance is not degraded and the circuit i...2002
7 Harrison, Reid R.Fly-inspired VLSI vision sensorsEngineers have long looked to nature for inspiration. The diversity of life produced by five billion years of evolution provides countless existence proofs of organic machines with abilities that far surpass those of our own relatively crude automata. We have learned how to harness large amounts of ...2002
8 Tasdizen, Tolga; Whitaker, Ross T.Geometric surface smoothing via anisotropic diffusion of normalsThis paper introduces a method for smoothing complex, noisy surfaces, while preserving (and enhancing) sharp, geometric features. It has two main advantages over previous approaches to feature preserving surface smoothing. First is the use of level set surface models, which allows us to process ver...2002
9 Stringfellow, Gerald B.Influence of Sb, Bi, Tl, and B on the incorporation of N in GaAsGaAs:N is an interesting material for many devices due to its unique compositional variation of band gap. Small amounts of N lead to a strong decrease in band gap energy as well as lattice constant. The further addition of In or Sb leads to quaternary alloys with band gap energies below 1.4 eV latti...Antimony; Gallium Arsenide; Nitrogen2002
10 Stevens, KennethLazy transition systems and asynchronous circuit synthesis with relative timing assumptionsThis paper presents a design flow for timed asynchronous circuits. It introduces lazy transitions systems as a new computational model to represent the timing information required for synthesis. The notion of laziness explicitly distinguishes between the enabling and the firing of an event in a tr...2002
11 Myers, Chris J.Level oriented formal model for asynchronous circuit verification and its efficient analysis methodUsing a level-oriented model for verification of asynchronous circuits helps users to easily construct formal models with high readability or to naturally model datapath circuits. On the other hand, in order to use such a model on large circuits, techniques to avoid the state explosion problem must ...2002
12 Mathews, V. John; Clark, Edward B.Mean frequency estimation of narrowband signals and its application to doppler ultrasound blood velocity waveform estimationABSTRACT Many applications involving Doppler signals require the accurate estimation of the power-weighted mean frequency over short durations of the signal due to it's nonstationarity. This paper presents a novel algorithm for estimating mean frequencies using the eigenstructure of the covariance ...2002
13 Harrison, Reid R.Phonotaxis in crickets and robotsOver the past decade, we have built and tested several robot models to investigate a particular biological behavior, the sound localizing (phonotaxis) ability of the cricket. This work has had several purposes. One is to develop robotic technology, such as novel sensors and control systems, by copyi...Phonotaxis2002
14 Mathews, V. John; Clark, Edward B.Reconstruction of maximum blood velocity waveforms from doppler ultrasound measurementsAbsfauct -This paper presents a novel algorithm for the extraction of maximum blood flow velocity waveform from Doppler measurements. This method is based on the short-term integrated spectrum of the Doppler signal, and does not require a pre-selected threshold level to deal with the background nois...2002
15 Stevens, KennethRelative timing based verification of timed circuits and systemsAggressive timed circuits, including synchronous and asynchronous self-resetting circuits, are particularly challenging to design and verify due to complicated timing constraints that must hold to ensure correct operation. Identifying a small, sufficient, and easily verifiable set of relative timin...2002
16 Myers, Chris J.Synchronous interlocked pipelinesIn a circuit environment that is becoming increasingly sensitive to dynamic power dissipation and noise, and where cycle time available for control decisions continues to decrease, locality principles are becoming paramount in controlling advancement of data through pipelined systems. Achieving fine...2002
17 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
18 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
19 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
20 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
21 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
22 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
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