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1992 IEEE-SP International Symposium on Time-Frequency and Time-Scale Analysis

作者： Fang, J. Atlas, L. Bernard, G. Interactive Systems Design Laboratory Department of Electrical Engineering FT-10 University of Washington SeattleWA98195 United States Boeing Commercial Airplane Group P.O. Box 3707 M/S 5K-14 SeattleWA98 124-2207 United States

ISBN: (纸本)0780308050

Cascaded quadratic detectors are applied to manufacturing sensor signals. These detectors provide a technique which allows excellent frequency selectivity and noise suppression, without sacrificing temporal resolution. The authors demonstrate the applicability of these detectors with an example of manufacturing sensor data and show their advantages over conventional linear techniques. © 1992 IEEE.

关键词： Manufacture

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Quantitative Analysis of Organic Vapor Mixtures Using Non-Selective and Nonlinear Chemical Sensors with Artificial Neural Networks

Quantitative Analysis of Organic Vapor Mixtures Using Non-Se...

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IJCNN International Joint Conference on Neural Networks

作者： Jing Fang Xiaodong Wang Patrick Carey Sinclair Yee Interactive Systems Design Laboratory Department of Electrical Engineering FT-10 University of Washington SeattleWA 98195 Department of Electrical Engineering FT-10 Center for Process Analytical Chemistry University of Washington SeattleWA 98195

Non-selective and nonlinear response characteristics of chemical sensors is an important limitation to analyzing multicomponent chemical *** of the past research was focused on finding a close form to describe nonlinear sensor array systems,which required many unrealistic assumptions such as linear ***,we have used neural networks for nonlinear sensing process modeling without underlying *** demonstrated on two and three component organic vapor mixture analyses with eight non-selective and nonlinear gas sensors,the multilayer perceptrons performed more accurate predictions of the individual vapor concentrations in comparison with the commonly used linear techniques and nonlinear techniques.

关键词： PLS PPR Quantitative Analysis of Organic Vapor Mixtures Using Non-Selective and Nonlinear Chemical Sensors with Artificial Neural Networks

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Introducing the through-line deembedding procedure

Introducing the through-line deembedding procedure

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Microwave, MTT-S International Symposium

作者： M.B. Steer S.B. Goldberg G. Rinne P.D. Franzon I. Turlik J.S. Kasten High Frequency Electronics Laboratory and the Picosecond Digital Systems Laboratory Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA Microelectronics Center of North Carolina NC USA

The through-line (TL) method is introduced to replace the through-reflect-line (TRL) deembedding procedure. TL utilizes measurements of two lengths of line following approximate open-short-line calibration. TL accounts for the frequency-dependent characteristic impedance of the line and avoids the periodic glitches inherent in the TRL procedure.< >

关键词： Calibration Impedance measurement Fixtures Reflection Testing Frequency Transmission line measurements Laboratories Capacitance measurement Digital systems

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A component-invariant second-order switched-current sigma-delta modulator

A component-invariant second-order switched-current sigma-de...

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： P.J. Crawly G.W. Roberts Dept. of Electr. Eng. McGill Univ. Montreal Que. Canada Microelectronics and Computer Systems Laboratory Department of Electrical Engineering McGill University Canada

The authors present the building blocks and design procedure necessary for creating a component-invariant second-order switched current (SI) sigma-delta modulator ( Sigma Delta M). A novel SI second-order integrator block is paramount to the design. A voiceband (4-kHz) analog-to-digital (A/D) converter was designed and laid out in Northern Telecom's 1.2- mu m CMOS process. Final transistor level simulations on the netlist derived directly from the layout indicated a resolution of only 10 b, a result of excessive charge injection and clock feedthrough. The power and area requirements of the SI design are estimated to be 0.2 mW and 0.2 mm/sup 2/, respectively.< >

关键词： Delta-sigma modulation Switches Computer aided manufacturing CADCAM Circuits Voltage Telecommunication switching CMOS process Signal design Signal processing

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A comparative study of bearing designs and operational environments for harmonic side-drive micromotors

A comparative study of bearing designs and operational envir...

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IEEE International Conference on Micro Electro Mechanical systems

作者： V.R. Dhuler M. Mehregany S.M. Phillips J.H. Lang Electronics Design Center Department of Electrical Engineering & Applied Physics Case Western Reserve University Cleveland OH USA Laboratory of Electromagnetic & Electronic Systems Department of Electrical Engineering & Computer Science Massachusetts Institute of Technology Cambridge MA USA

The authors report the development of flange bearing harmonic side-drive (referred to as wobble) micromotors and the results from a comparative study of the operation of flange and center-pin bearing micromotors in different gas environments. Both the flange and center-pin wobble micromotors have been operated with excitation as low as 30 V across 1.5 mu m rotor/stator gaps. In contrast to the center-pin bearing wobble micromotors it was found that the performance of the flange bearing wobble micromotors is not significantly affected by the operational environment. A convenient experimental procedure to characterize friction in wobble micromotors has been developed. Additionally, the requisite wobble micromotor dynamic model for extracting the bearing and bushing/flange frictional parameters from the experimental data is discussed.< >

关键词： Micromotors Flanges Rotors Fabrication Insulators Gears Stators Contacts Friction Physics

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ANALYSIS OF 3-D MICROWAVE RESONATORS USING COVARIANT-PROJECTION ELEMENTS

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IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 1991年第11期39卷 1895-1899页

作者： WEBB, JP MINIOWITZ, R Computational Analysis and Design Laboratory Department of Electrical Engineering McGill University Montreal QUE Canada Electromagnetics Department RAFAEL Advanced Defense Systems Limited Haifa Israel

Three-dimensional microwave resonators of arbitrary shape can be analyzed with the finite element method using covariant-projection elements, curvilinear bricks which impose only tangential field continuity. The method produces no spurious modes, and works well even when sharp metal edges are present. The matrices involved, though large, are sparse;an appropriate sparse eigenvalue algorithm allows the method to run in modest amounts of memory. Results are presented for a number of test cases, including a rectangular microstrip resonator.

关键词： Finite element methods Magnetic resonance Shape Eigenvalues and eigenfunctions Microwave devices Magnetic fields Magnetic analysis Microwave theory and techniques Covariance matrix Sparse matrices

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NOVEL TEST STRUCTURE FOR THE MEASUREMENT OF ELECTROSTATIC DISCHARGE PULSES

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IEEE TRANSACTIONS ON SEMICONDUCTOR MANUFACTURING 1991年第3期4卷 213-218页

作者： LENDENMANN, H SCHRIMPF, RD BRIDGES, AD Integrated Systems Laboratory Swiss Federal Institute of Technology Zurich Switzerland Department of Electrical and Computer Engineering University of Arizona Tucson Tucson AZ USA AT and T Microelectronics Allentown PA USA

A test chip to measure electrostatic discharge (ESD) events was designed and fabricated. The structure for the measurement of the pulses was based on a floating-gate field-effect transistor. Experiments showed that the shift of the device characteristics following an ESD event can be used to measure ESD pulse magnitudes down to approximately 60 V.

关键词： Pulse measurements Testing Electrostatic measurements Electrostatic discharge Voltage Semiconductor device measurement Nonvolatile memory Electrons Bridge circuits FETs

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DEGREES OF CYCLOSTATIONARITY AND THEIR APPLICATION TO SIGNAL-DETECTION AND ESTIMATION

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SIGNAL PROCESSING 1991年第3期22卷 287-297页

作者： ZIVANOVIC, GD GARDNER, WA Computer Systems Design Laboratory “Boris Kidrič” Institute Vinča P.O. Box 522 11001 Belgrade Yugoslavia Signal Processing Group Department of Electrical Engineering & Computer Science University of California Davis CA 95616 USA

The problem of defining an appropriate measure of the degree of nonstationarity for stochastic processes that exhibit cyclostationarity is addressed. After discussing several candidate measures of degree of nonstationarity, one particularly promising measure is adopted. By decomposing this measure, several component measures are arrived at. Bounds on these measures are derived and their utility in applications involving signal detection and estimation is established. Examples are presented to illustrate the calculation of degrees of nonstationarity for several types of cyclostationary signals.

关键词： CYCLOSTATIONARY PROCESS DEGREE OF CYCLOSTATIONARITY INSTANTANEOUS SPECTRUM SPECTRAL CORRELATION

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Recurrent neural networks and time series prediction

Recurrent neural networks and time series prediction

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International Joint Conference on Neural Networks (IJCNN)

作者： J. Connor L. Atlas Interactive Systems Design Laboratory Department of Electrical Engineering University of Washington Seattle WA USA

Uses a parametric statistical framework to understand the effect of input representation on performance for nonlinear prediction of time series. In particular, considerations of input representation lead directly to choices between feedforward and recurrent neural networks. It is shown that feedforward networks are nonlinear autoregressive models and that recurrent networks can model a larger class of processes, including nonlinear autoregressive moving average models. For some processes, feedback allows recurrent networks to achieve better predictions than can be made with a feedforward network with a finite number of inputs. The results are confirmed on a problem in power system regional load forecasting.< >

关键词： Recurrent neural networks Autoregressive processes Power system modeling Load forecasting Stochastic processes Filters Linear approximation Interactive systems Power system analysis computing Time series analysis

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A theory of desirable properties for preprocessors for speech recognizers

A theory of desirable properties for preprocessors for speec...

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IEEE Pacific Rim Conference on Communications, Computers and Signal Processing

作者： L.E. Atlas P.J. Loughlin J.W. Pitton Interactive Systems Design Laboratory Department of Electrical Engineering FT-10 University of Washington Seattle WA USA

The design of preprocessors, or front-ends, for a speech recognition system is considered to be critical to the overall performance of the system. A design methodology, which is inspired by and, in some ways, formulated from the theory of time-frequency analysis, is presented. Examples of specific desirable properties for preprocessors are presented, and preliminary results supporting the need for a frequency transform are summarized. The authors propose eight properties for speech preprocessors. The last property, that of frequency analysis, was experimentally confirmed for single short segments of speaker-independent vowels. It is concluded that frequency transforms are needed for the simple case of speaker-independent vowel recognition.< >

关键词： Speech recognition Time frequency analysis Hidden Markov models design methodology Cepstral analysis Filter bank Fourier transforms Interactive systems Laboratories Acoustic waves

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