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TRANSIENT SCATTERING BY CONDUCTING CYLINDERS - TE CASE

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 1992年第9期40卷 1103-1107页

作者： VECHINSKI, DA RAO, SM Department of Electrical Engineering Aubum University Auburn AL USA

In this work, transient scattering (transverse electric (TE) case) by two-dimensional cylinders, both open and closed, is investigated using the marching-on-in-time (MOT) technique. A simple averaging scheme is also presented to control the late-time oscillations. Numerical results are presented for certain representative geometries and compared with inverse Fourier transform techniques. Good comparison is noted in each case.

关键词： Computer aided software engineering Antennas and propagation Fourier transforms Electromagnetic propagation Electromagnetic scattering message-oriented middleware Gradient methods Kernel Integral equations Tellurium

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Variational nature of Galerkin and non-Galerkin moment method solutions

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IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 1996年第4期44卷 500-503页

作者： Peterson, AF Wilton, DR Jorgenson, RE UNIV HOUSTON DEPT ELECT ENGNHOUSTONTX 77204 SANDIA NATL LABS ALBUQUERQUENM 87185

The variational aspects of secondary calculations based on a method of moments (MoM) solution are investigated. These calculations exhibit a type of second-order accuracy, regardless of whether or not the operator being discretized is self-adjoint, and regardless of whether or not testing functions are identical to the basis functions (Galerkin's method). Numerical results support these conclusions and suggest that the advantage of Galerkin's method in actual calculations is grossly overstated.

关键词： Moment methods message-oriented middleware Automatic testing Electromagnetic radiation Electromagnetic scattering Integral equations Current density Laboratories

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CAPACITORS FOR MICROWAVE APPLICATIONS

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IEEE TRANSACTIONS ON PARTS HYBRIDS AND PACKAGING 1976年第2期12卷 83-89页

作者： VELORIC, HS MITCHELL, J THERIAULT, GE CARR, LA RCA LABS DAVID SARNOFF RES CTR PRINCETONNJ 08540

The properties and design of a metal-oxide-metal (MOM) capacitor are reviewed and its performance is compared with that of conventional MOS and metalized ceramic capacitors. The MOM structure is fabricated by growing a high-performance dielectric such as SiO 2 or Si 3 N 4 on silicon and metalizing the dielectric with several mils of copper, after which the silicon "handle" is removed and replaced with copper. The MOM capacitor has the high capacitance density, low dielectric loss, and low temperature coefficient properties of thermally grown dielectrics. In addition, the resistive electrode loss is minimized by the replacement of the Iossy silicon with copper. The electrode loss for the MOS and MOM capacitors is evaluated as a function of frequency and is in good agreement with the loss estimated from the surface sheet resistance. The series resistance of an MOM capacitor is only 10 percent of that measured for a comparable MOS structure. MOM capacitors have been successfully soldered into circuits; these assemblies have been temperature cycled and high temperature stressed.

关键词： MOS capacitors message-oriented middleware Silicon Copper Dielectric losses Temperature Electrodes Frequency estimation Surface resistance Ceramics

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CHARACTERISTICS OF INTEGRATED MOM JUNCTIONS AT DC AND AT OPTICAL FREQUENCIES

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IEEE JOURNAL OF QUANTUM ELECTRONICS 1978年第3期14卷 159-169页

作者： HEIBLUM, M WANG, S WHINNERY, JR GUSTAFSON, TK UNIV CALIF BERKELEY ELECTR RES LAB BERKELEY CA 94720 USA

We present a new metal-oxide-metal device (Ni-NiO-Ni, "Edge MOM") which is stable, reproducibly fabricated, and with a 10 -10 -cm 2 tunneling area. Performing detection experiments, the device's nonlinear I-V characteristic is shown to be invariant at audio frequencies, 10.6, 3.39, and 0.6328 μm. Similar devices with 10 -8 -cm 2 tunneling areas perform as well as the Edge MOM's in the visible and the near-infrared range, but deteriorate in performance at the 10-μm range. A dominant competing effect is a thermal-induced signal, which increases with frequency and temperature. Coupling mechanisms at the various regimes are investigated. The device can serve as a broad-band detector and mixer, and might in the future be a basic element of broad-band amplifiers and oscillators.

关键词： message-oriented middleware Integrated optics Frequency Tunneling Nonlinear optical devices Nonlinear optics Temperature Detectors Optical amplifiers Oscillators

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INFERENCE OF A KNOWLEDGE SOURCE FOR THE RECOGNITION OF NASALS IN CONTINUOUS SPEECH

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IEEE TRANSACTIONS ON ACOUSTICS SPEECH AND SIGNAL PROCESSING 1979年第5期27卷 538-549页

作者： DEMORI, R GUBRYNOWICZ, R LAFACE, P POLITECN TORINO IST ELETTROTECNICA I-10129 TURIN ITALY POLISH ACAD SCI INST FUNDAMENTAL TECHNOL RES WARSAW 42 POLAND

A system for the automatic recognition of bilabial /m/ and alveolar /n/ in vowel-consonant-vowel utterances extracted from continuous speech is presented. It is based on a syntactic pattern recognition approach and the use of fuzzy relations for evaluating phonemic hypotheses. The knowledge source, based on very simple transition networks with associated simple semantic rules, is inferred from experiments. Results obtained for four male speakers are presented together with an acoustic-phonetic motivation of the approach used. These show how accounting for coarticulation effects gives substantially better performances than previous approaches.

关键词： Speech recognition Automatic speech recognition message-oriented middleware Pattern recognition Loudspeakers Character recognition Error analysis Acoustics Feature extraction

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FEATURE SELECTION AND CONCEPT OF IMMEDIATE NEIGHBORHOOD IN CONTEXT OF CLUSTERING TECHNIQUES

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PROCEEDINGS OF THE IEEE 1974年第4期62卷 529-530页

作者： DASARATHY, BV INDIAN INST SCI SCH AUTOM BANGALORE 560012 INDIA

The concept of feature selection in a nonparametric unsupervised learning environment is practically undeveloped because no true measure for the effectiveness of a feature exists in such an environment. The lack of a feature selection phase preceding the clustering process seriously affects the reliability of such learning. New concepts such as significant features, level of significance of features, and immediate neighborhood are introduced which result in meeting implicitly the need for feature slection in the context of clustering techniques.

关键词： Diodes Infrared detectors message-oriented middleware Metal-insulator structures Stability Tunneling Frequency measurement Impedance Microwave theory and techniques Rectifiers

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LIMIT-CYCLE BEHAVIOR OF PIPELINED RECURSIVE DIGITAL-FILTERS

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IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-ANALOG AND DIGITAL SIGNAL PROCESSING 1994年第5期41卷 351-355页

作者： CHANG, KH BLISS, WG Integrated Circuits Development Section Electronics and Telecommunications Research Institute Daejeon South Korea

The important new class of pipelined IIR filters, called Scattered Look-Ahead (SLA) filters, is analyzed for limit cycle behavior, including both overflow and quantization limit cycles. Direct Form (DF), Minimum RoundOff Noise (MRON) form and Apparent Direct Form (ADF) are selected as basis structures of SLA filters. The z-domain is extensively searched as a function of the number of pipelining stages for limit cycle free regions, which is transferred from analytic parameter space results. In consequence, the DF SLA structure is proved to have merits implementing high Q filters except at certain regions near the unit circle, where the structure is highly susceptible to RoundOff Noise (RON) and Coefficient Quantization Noise (CQN). DF and MRON based structures are compared for the purpose of reducing complexity or improving numerical performance.

关键词： Limit-cycles Digital filters Quantization Pipeline processing IIR filters Scattering Dynamic range Digital arithmetic Noise reduction message-oriented middleware

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SensorBus ‑ A Policy-Based middleware for Wireless Sensor Networks

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IEEE Latin America Transactions 2008年第7期6卷 647-654页

作者： Admilson de Ribamar Lima Ribeiro Lilian Coelho Freitas Carlos Renato Lisboa Frances Joao Crisostomo Weyl Albuquerque Costa Aluna de pós-graduação no Departamento de Engenharia Elétrica e Computação Universidade Federal do Pará Belem Para Brazil Departamento de Engenharia Elétrica e Computação Universidade Federal do Pará Belem Para Brazil Universidade Federal do Para Belem PA BR

The use of middleware to develop distributed applications liberates the programmer of the concerns (communication and coordination among software components) imposed by the distributed network environment. Besides these concerns, in wireless sensor networks are considered, also, their specific characteristics (address, mobility, amount and limited resources of the sensor nodes). This paper describes the implementation and performance evaluation of SensorBus, a message-oriented adaptive middleware for wireless sensor networks that uses policies to assist to the several characteristics of the wireless sensor networks. Policies are implemented in an application profile, through metadata, encoded in XML documents. Performance evaluation of SensorBus is made through their two main services: application and context. We used measurement techniques and simulation to carry out the experiments. Experiments show that using metadata to incorporate policies in the middleware does not imply undue overheads.

关键词： Wireless sensor networks Monitoring Application software Programming profession Sensor phenomena and characterization message-oriented middleware XML Context-aware services Measurement techniques Single event transient

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SIMPLE AND EFFICIENT NUMERICAL-METHODS FOR PROBLEMS OF ELECTROMAGNETIC-RADIATION AND SCATTERING FROM SURFACES

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IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 1980年第5期28卷 593-603页

作者： GLISSON, AW WILTON, DR Department of Electrical Engineering University of Mississippi MS USA

Simple and efficient numerical methods are developed for treating electromagnetic problems of scattering and radiation from surfaces. Special consideration is given to the treatment of edges so that rather arbitrary geometrical configurations may be handled. For the conducting body problems considered, an electric field integral formulation is used, and the method of moments is applied using pulse expansions to represent both the current and the charge. It is demonstrated that proper placement of the current and charge subdomains relative to edges not only is important in treating edges but also yields a convenient numerical procedure. A simple testing scheme is used which is almost as efficient as point-matching. Numerical results indicate that the approach is free of anomalies in the behavior of current near edges and of other previously observed numerical instabilities. Problems considered include conducting strips (both TM and TE), a bent rectangular plate, and both material and conducting bodies of revolution.

关键词： Electromagnetic radiation Electromagnetic scattering Surface treatment Sea surface Testing Conductors Moment methods message-oriented middleware Integral equations Strips

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THINNING TECHNIQUE FOR MOMENT-METHOD SOLUTIONS

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PROCEEDINGS OF THE IEEE 1983年第2期71卷 265-266页

作者： CHENG, DK LIANG, CH Electrical and Computer Engineering Department Syracuse University Syracuse NY USA

A general thinning technique in conjunction with the use of the method of moments is developed. Judicious applications of this technique will save much computation time without sacrificing the desired accuracy. Calcul... 详细信息

关键词： message-oriented middleware Matrices Moment methods Application software Integrodifferential equations Impedance Voltage Capacitance Capacitors Availability

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