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5th SBMO International Microwave Conference/Brazil, SBMO 1993

作者： Rokushima, K. Matsumoto, K. Yamakita, Jiro Department of Information Systems Engineering Osaka Sangyo University Daito Osaka574 Japan Department of Computer and Communication Science Okayama Prefectural University Soujya Okayama700 Japan

ISBN: (纸本)0780312880

A rigorous analysis of guided waves in dielectric waveguides with slanted gratings is presented for the general three-dimensional case of oblique propagation. The analysis is formulated in a unified matrix form so that guidance properties can be obtained accurately in any level by systematic matrix calculations. The numerical results clarify the efects of the slant angle and oblique propagation. © 1993 IEEE.

关键词： Guided electromagnetic wave propagation

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Application of neural networks to direct stability analysis of power systems

Application of neural networks to direct stability analysis ...

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International Forum on Applications of Neural Networks to Power systems

作者： D.B. Klapper H.A. Othman Y. Akimoto H. Tanaka J. Yoshizawa Power Systems Engineering Department General Electric Company Limited USA Computer & Communication Research Center Tokyo Electric Power Company Inc. Japan

The feasibility of designing neural networks capable of computing the critical clearing times of power system faults is explored. Two distinct approaches are investigated, the patter recognition approach and the optimization approach. The theory of direct stability analysis of power systems is utilized is designing he input features of the pattern recognition approach, and the structure of the Hopfield optimization approach.< >

关键词： Neural networks Stability analysis Power system analysis computing Power system stability Power system faults Hopfield neural networks computer networks Power engineering computing Pattern recognition Power system simulation

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CMOS sampler with 1 Gbit/s bandwidth and 25 ps resolution

CMOS sampler with 1 Gbit/s bandwidth and 25 ps resolution

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Custom Integrated Circuits Conference (CICC)

作者： W. van Noije C.T. Gray W. Liu T.A. Hughes R.K. Cavin W.J. Farlow LSI DEE EPUSP University Brazil Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA MIP Computer and Communication Systems USA IBM NC USA Department of Electrical Computer Engineering North Carolina State University Raleigh NC USA

A technique and circuitry for real-time high-resolution sampling of a digital waveform are presented. This circuitry has been fabricated in 1.2 /spl mu/m CMOS technology, and test results show a bandwidth of up to 1 Gbit/s for the digital data and a sampling resolution externally adjustable between 25 ps and 250 ps. The fabricated circuit has shown sampling stability, monotonicity, and uniformity in sampling resolution.

关键词： Bandwidth Sampling methods Clocks Latches Inverters Circuits Signal resolution CMOS technology Propagation delay Metastasis

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A multiprocessor communication architecture for high speed networks

A multiprocessor communication architecture for high speed n...

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IEEE Region 10 International Conference TENCON

作者： S. Iyengar N. Apte A.A. Roy S. Sanyal N.M. Singhi Wu Geng Feng Victoria Jubilee Tech. Inst. Bombay India Victoria Jubilee Technical Institute Bombay India Computer Systems and Communication Group School of Mathematics TIFR Bombay India Department of Electronics & Electrical Engineering. USTC Hefei Anhui China

Over the years, communication speed of networks has increased from a few Kbps to several Mbps, as also has the bandwidth demand. communication protocols, however, have not improved to that extent. With the advent of Wavelength Division Multiplexing (WDM), it is now possible to "tune" protocols to current and future demands. This paper, develops a High Speed Network architecture, which caters to the needs of bandwidth-consuming applications such as voice, video and high definition image transmission.< >

关键词： High-speed networks Bandwidth Protocols Wavelength division multiplexing High definition video Image communication Permission Routing computer architecture Mathematics

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ACCURACY REQUIREMENTS FOR MEASUREMENT systems WITH UNIFORM AND NORMAL ERRORS

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NAVAL ENGINEERS JOURNAL 1993年第1期105卷 66-69页

作者： SNOW, JM STUCKMAN, BE USHER, JS Jeffrey M. Snow:received his B.S. degree in mechanical engineering from the University of Washington in 1977. He has worked at Boeing Commercial Aircraft Company and Puget Sound Naval Shipyard. Since 1985 he has been at Naval Surface Warfare Center Crane Division (NSWCC). From 1987 to 1990 he was in charge of quality assurance configuration management and reliability for Aegis (SPY-1 and Mk-99) microwave tubes. He currently is in the Radar System Branch at NSWCC. He is a member of ASQC and ASME. His areas of interest include the use of statistics in process improvement efforts and objectively rating and rewarding suppliers for better quality. Bruce E. Stuckman:holds a Ph.D. degree in systems engineering from Oakland University where he also obtained M.S. and B.S. degrees in electrical and computer engineering. In 1992 Dr. Stuckman obtained his J.D. from the University of Louisville where he graduated cum laude. He is currently an associate in the patent and computer law department of Brooks & Kushman a law firm specializing in intellectual property and technology related causes. Prior to this he was an associate professor of both electrical engineering at the University of Louisville and a member of the Research Advisory Board of the South Central Bell Telecommunications Research Center. Dr. Stuckman is the author of over 75 published works in a variety of research areas including global optimization algorithms control systems communication and telecommunication systems and instrumentation electronics. He has served as a technical consultant to such organizations as Control Data Corporation General Electric General Motors Research Laboratories Gulf & Western AT&T Bell Laboratories ARCO Research and Technical Services and the U.S. Government and has been a frequent lecturer at national and international symposia. He is a senior member of IEEE and a member of ASNE Eta Kappa Nu Tau Beta Pi Sigma Xi and Phi Kappa Phi. John S. Usher Ph.D. P.E.:is an assistant professor of industrial engineering

Accuracy requirements are usually determined as a percentage of the specification range of the measured part or process. Setting accuracy requirements in this manner results in a wide and unpredictable range of false rejection and acceptance probabilities. This causes extra costs due to either: 1) over specification of measurement systems accuracy requirements;2) time, effort, retesting, and resolution of false rejections;or 3) system degradation caused by false acceptance of out-of-specification parts. Achieving a consistent and known risk of false acceptance is only possible by considering the measured process C(pk), the process's mean in relation to the center of the specification range, and the measurement system error distribution. This paper presents a method for calculating the probabilities of false rejection and false acceptance for a normal process which is measured with, alternately, uniform and normally distributed error. It is shown that under most conditions uniform error causes 20% to 30% higher false rejection and acceptance probabilities. Thus, knowledge of measurement error distribution could provide lower total production cost.

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Guest Editorial: Focus on Digital Signal Processing Techniques Applied to Space communications

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European Transactions on Telecommunications 1993年第1期4卷 9-10页

作者： Gaudenzi, Riccardo De Elia, Carlo Harris, Robert A. Rimrdo De Gaudend was born in Rosignano Mmo Italy in 1960. He received the Doctor En- gineer degree (cum Laude) in Electronic Engineering from the University of Pisa. Italy in 1985. From 1986 he was with the European Space Agency (ESA). Stsliow and Communications Engineering Department. Darmrtadt (RFA) where he was involved in satellite telecommunication ground systems design and testing. In particular he followed the development of two new ESA's satellite tracking systems. In 1988 be joined the ESA's Research and Technology Centre (ESTEC). Noordwijk. The Netherlands where is holding a position as releeommunication enginm in the Electrical System Department. He is presently responsible for the definition and development of advanced satellite communication systems. His mull intenst b ddyrducd with effacnt digital modulation and access techniques for fued and mobile wtdlite services synchronization topics and communication systems simulation techniques. Carlo Elia (S'89) was born in Trepuzzi. Italy in 1964. He received the Doctor Engineer degree in Electronic Engineering from Politecnico di Torino. Torino. Italy. in 1989. He his now attending a Doctorate program at PolitanieO di Torino. S i 1990. he has been with the Eurpean Space Agency (ESA) in the Electrical System Department as Tdeeommunications Syrtcm Engineer. His main areas of interest are related to rdvanccd digital modulation and access techniques and channel equalization. R.A. (Bob) Harris (S'69–M'70) received the PhD from the University of Southampton. England in 1971. In 1970 he joined the European Space Agency (then ESRO). based at the European Space Research and Technology Centre (ESTEC) Noordwijk. The Netherlandswas working on telemetry and telecommand systems. Since 1978 he has been Head of the Transmision Techniques Section in the Directorate of Telecom munications. He was involved in the transmission design of the OTS ECS Olympus and European Data Relay systems. He has worked on a wide range of analogue and digital transmission topics wit

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HYBRID CODERS WITH MOTION COMPENSATION

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MULTIDIMENSIONAL systems AND SIGNAL PROCESSING 1992年第2-3期3卷 241-266页

作者： CHEN, CF PANG, KK Video Communication Group Department of Electrical and Computer Systems Engineering Monash University Clayton Australia

This paper investigates analytically the effects of motion compensation in a coder based on the observed properties of motion-compensated frame difference (MCFD) signals. The AR(1) processes with a given pixel-to-pixel autocorrelation coefficient will be used to model the interframe images. For interframe motion, each image is allowed to have both moving and nonmoving parts, with the moving parts executing a range of translational motion. From this mathematical model, the statistical characteristics of MCFD signals am derived. Motion compensation gain, 2-D intraframe transform gain, and hybrid gain are next evaluated to ascertain their suitability for the coding process. Experimental results on the Trevor sequence seem to confirm the model and conform with its analytical results.

关键词： MOTION COMPENSATION MOTION ESTIMATION INTERFRAME CODING INTRAFRAME CODING HYBRID CODING CORRELATION MATRIX DISTORTION RATE FUNCTION

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Multidimensional fourier transforms by systolic architectures

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Journal of VLSI Signal Processing 1992年第4期4卷 343-354页

作者： Roziner, T.D. Karpovsky, M.G. Research Laboratory for Design and Testing of Computers and Communication Systems Department of Computer and Systems Engineering Boston University Boston 02215 Massachusetts 44 Cummington Street United States

In this paper, time-efficient systolic and semi-systolic architectures for the implementation of multidimensional DFTs are proposed that allow modularity and easy expansibility while keeping throughput independent of the dimension of the DFT. We shall call an array semi-systolic if the input data is to be preloaded into every cell of the array or if the output data can be calculated not only in the boundary cells of the array. DFT algorithms are represented by FORTRAN-like code, in order to explicitly display the suggested rotational transformations in the index space. After the transformation, multidimensional DFT algorithm can be mapped onto a systolic structure. The area-time² complexity of the proposed design is within log k factor of the lower bound for a k-point DFT (AT²=Ω(k² log²k)), i.e. equals 0(k² log³k)=0(N^{2 M} log³N) for k=N^{2 M} point DFT;A is the area complexity and T is the system throughput. © 1992 Kluwer Academic Publishers.

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Inter-channel Interference Cancellation technique for CDMA mobile/personal communication systems 3

Inter-channel Interference Cancellation technique for CDMA m...

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3rd IEEE International Symposium on Personal, Indoor and Mobile Radio communications, PIMRC 1992

作者： Kubota, Shuji Kato, Shuzo Feher, Kamilo NTT Radio Communication Systems Laboratories 1-2356 Take Yokosuka238-03 Japan Digital Communication Laboratory Department of Electrical and Computer Engineering University of California Davis United States

ISBN: (纸本)0780308417

In order to increase the channel capacity of CDMA (Code Division Multiple Access) mobile/personal communication systems, an Inter-channel Interference Cancellation (IIC) technique is proposed. By employing one or few additional interference cancellation circuits, it makes it possible to increase allowable error of the TXPC (Transmission Power Control) at the mobile/personal terminals. The experimental results show that by employing the proposed IIC scheme, Pe performance degradation due to a desired and an undesired signal power ratio of -20dB (20dB of TXPC control error) can be improved to only 1.5dB at Pe=10-3. © 1992 IEEE.

关键词： Code division multiple access

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Factors Affecting Pitch Accent Placement 2

Factors Affecting Pitch Accent Placement

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2nd International Conference on Spoken Language Processing, ICSLP 1992

作者： Ross, K. Ostendorf, M. Shattuck-Hufnagel, S. Electrical Computer and Systems Engineering Boston University BostonMA02215 United States Speech Communication RLE Massachusetts Institute of Technology CambridgeMA02139 United States

Correct pitch accent placement can substantially improve the naturalness of text-to-speech synthesis, and has been acknowledged as an important problem in synthesis research. This paper describes an empirical study of the factors that affect pitch accent placement based on the Boston University radio news corpus. Issues examined included accent placement on function words, relative importance of different influencing factors, early accent placement within the word, and variability across speakers. Incorporating the results of these four analyses into questions for decision-tree-based pitch accent prediction results in an algorithm with an accuracy of 95% on syllables marked in all of four read versions of a story and only 7% false assignment of pitch accent to syllables not marked by any of the speakers. © 1992 2nd International Conference on Spoken Language Processing, ICSLP 1992. All rights reserved.

关键词： Speech synthesis

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