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IEEE International Conference on Communications (ICC)

作者： P. Wei T. Soni J.R. Zeidler W.H. Ku P.K. Das Department of Electrical and Computer Engineering University of California San Diego La Jolla CA USA R.d.t. & E. Division Control and Ocean Surveillance Center San Diego CA USA Department of Electrical Computer Engineering University of California San Diego La Jolla CA USA

A number of different techniques for the suppression of narrowband interference due to overlay in code division multiple access (CDMA) systems have previously been studied. The relative performances of three such techniques for a fading channel, multi-user CDMA system are described. Personal communication network systems using suppression filters based on the transversal least mean square (LMS) and the lattice and transform domain algorithms are studied. Bit error rates are found by simulations for different suppression filters. The overlay signal is assumed to be narrowband binary phase shift keying (BPSK) and the performance of these systems is studied for varying BPSK carrier frequency offsets. Since both the lattice and LMS filters converge to the Wiener filter, their relative performance is also studied during the on/off transient of the interference. It is found that the LMS and recursive least square (RLS) perform similarly under stationary interference. The RLS is less susceptible to changes in the interference due to its faster convergence.< >

关键词： Interference suppression Multiaccess communication Personal communication networks Least squares approximation Wiener filter Binary phase shift keying Narrowband Transversal filters Lattices Resonance light scattering

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A network approach to parallel discrete event simulation

A network approach to parallel discrete event simulation

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Annual Conference of AI, Simulation, and Planning in High Autonomy Syslems

作者： S.T. Chang L.J. Peterson P.C.-Y. Sheu Department of Electrical and Computer Engineering Rutgers University Piscataway NJ USA RDT&E Division Naval Command Control and Ocean Surveillance Center San Diego CA USA

A network approach to parallel discrete event simulation is described. A set of production rules is used to describe the behavior of active objects in a simulation system so that production rules can be merged and evaluated collectively in a rule network. To maintain correctness and exploit all possible parallelism, each token is time-stamped and can be processed asynchronously. To handle rollbacks, a lazy cancellation approach is used.< >

关键词： Discrete event simulation Object oriented modeling Production systems computational modeling Constraint optimization Parallel processing Operating systems control system synthesis Oceans Surveillance

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ISAR imaging of an airborne DC-9 (aircraft)

ISAR imaging of an airborne DC-9 (aircraft)

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1993 IEEE International Conference on Acoustics, Speech, and Signal Processing

作者： M. Soumekh S. Nugroho S. Jones R. Rysdyk S. Tran Department of Electrical & Computer Engineering State University of New York University at Buffalo Amherst NY USA RDT&E Division Naval Command Control and Ocean Surveillance Center San Diego CA USA

The authors discuss the use of realistic ISAR (inverse synthetic aperture radar) data for an airborne DC-9 to exhibit some of the difficulties associated with processing ISAR data and interpretation of a reconstructed ISAR image. They consider methods to address these issues that are based on ISAR signature spectral properties of a moving target. In particular, they show the utility of spatial Doppler (slow-time Doppler) processing ISAR data in the target's velocity and acceleration estimation and its image formation. They present a method for reducing coherent speckle via separating the dominant reflector signature in the compressed ISAR signal. As a result, more details about the aircraft can be extracted from the ISAR data. Reconstruction results for various phases of the DC-9's flight path are presented.< >

关键词： Aircraft High-resolution imaging Synthetic aperture radar Image reconstruction Speckle Image databases Gold Acceleration Radar antennas Radar imaging

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A parallel VLSI implementation of Viterbi algorithm for accelerated word recognition

A parallel VLSI implementation of Viterbi algorithm for acce...

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Great Lakes Symposium on VLSI

作者： V. Upadhyaya S.J. Upadhyaya A. Kundu Dept. of Electr. & Comput. Eng. State Univ. of New York Buffalo NY USA Department of Electrical and Computer Engineering State University of New York University at Buffalo Buffalo NY USA Naval Command Control and Ocean Surveillance Center San Diego CA USA

A hardware VLSI implementation of the Viterbi algorithm is presented. The Viterbi algorithm is used to solve a word recognition problem using a hidden Markov model. In order to accelerate the speed of computation for real-time word recognition, the inherent parallelism in the recursion step of the algorithm is exploited. Details of the hardware implementation and experimental results are discussed.< >

关键词： Very large scale integration Viterbi algorithm Acceleration Hidden Markov models Handwriting recognition Hardware Parallel processing Tail Pipelines Text recognition

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An approach to the direct analysis of transient stability

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European Transactions on electrical Power 1993年第3期3卷 241-248页

作者： Djukanovic, M.B. Sobajic, D.J. Pao, Y.‐H. Miodrag B. Djukanovic (1959) received his B.S. M.Sc. and Ph.D. degrees in Electrical Engineering from the University of Belgrade/Yugoslavia in 1982 1985 and 1992 respectively specializing in electric power systems. In 1984 he joined the Electrical Engineering Institute “Nikola Tesla” in Belgrade where he was working on the scientific studies in the field of power systems planning operation and control. In 1985 and 1990 he was appointed as a research scholar at the Royal Institute of Technology Stockholm and Case Western Reserve University Cleveland Ohio. His major in- terests are in the area of power system analysis steady-state and dynamic security and application of neural networks in electric power systems. (Electrical Engineering Institute “Nicola Tesla” ul. Koste Glavinica 8A YU-11000 Belgrad T +3811/2351-619 Fax + 3811/2351-823) Dejan J. Sobajic (1949) received the B.S.E.E. and the M.S.E.E. degrees from the University of Belgrade/Yugoslavia in 1972 and 1976 respectively and the Ph.D. degree from Case Western Reserve University Cleveland Ohio in 1988. At present he is with the Department of Electrical Engineering and Applied Physics Case Western Reserve University Cleveland. He is also the Engineering Manager of A1 WARE Inc. Cleveland. His current research interests include power system operation and control neuralnet systems and adaptive control. He is a member of the IEEE Task Force on Neural-Network Applications in Power Systems and of the IEEE Intelligent Controls Committee. He is the Chairman of the International Neural-Networks Society Special Interest Group on Power Engineering. (Case Western Reserve University Department of Electrial Engineering and Computer Sciences Glennan Building Ohio 44 106 USA T + 1216/421-2380 Fax +1216/368-8776) Yoh-Han Pao (1922) has been a Professor of Electrical Engineering and Computer Science at Case Westem Reserve University (CWRU) Cleveland Ohio since 1967. He has served as chairman of the University's Electrical Engineering Department

The Transient Energy Function (TEF) method has been intensely investigated over the last decade as a reliable and accurate tool for transient stability assessment of multimachine power systems. In this paper we propose the Potential Energy Boundary Surface (PEBS) based method for direct analysis of transient stability. The critical value of transient energy and the Critical Clearing Time (T_CCT) are evaluated without the need for successive calculation and memorization of the system kinetic and potential energy values along the sustained fault trajectory. The method is used for determination of output features in the training phase of the neural‐net based transient security assessment. The proposed approach is tested on the well‐known ten‐generator New England test system demonstrating the validity and accuracy of obtained results. Copyright © 1993 John Wiley & Sons, Ltd.

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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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Backstepping Design of Robust controllers for a Class of Nonlinear Systems

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IFAC Proceedings Volumes 1992年第13期25卷 431-436页

作者： R.A. Freeman P.V. Kokotović Centre for Control Engineering and Computation Department of Electrical and Computer Engineering University of California Santa Barbara CA 93106 USA

We present a backstepping procedure for designing non-dynamic feedback compensators for a class of uncertain nonlinear systems. We assume knowledge of nonlinear growth bounds on the system uncertainties, and we require that these bounds satisfy a strict feedback condition (a condition much less restrictive than the matching condition). We develop two design procedures, one for systems whose uncertainties vanish at an equilibrium point (in which case we achieve global uniform asymptotic stability) and one for systems with more general types of uncertainties (in which case we achieve global uniform ultimate boundedness).

关键词： backstepping robust control nonlinear systems mismatched uncertainties global boundedness

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Field 24 amended in b/hAnalysis of mismatch sensitivity in a simulataneously latched CMOS sense amplifier

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IEEE Transactions on Circuits and Systems II: Analog and Digital Signal Processing 1992年第5期39卷 277-292页

作者： R. Sarpeshkar J.L. Wyatt N.C. Lu P.D. Gerber Department of Electrical Engineering and Computer Science Massachusetts Institute of Technology Cambridge MA USA Department of Computation and Neural Systems California Institute of Technology Pasadena CA USA IBM Research Division IBM Thomas J. Watson Research Center USA IBM Thomas J. Watson Research Center Yorktown Heights NY USA

A new formula for the sensitivity of a vertically matched CMOS sense amplifier, of the type used in DRAMs, to threshold voltage mismatch, parasitic capacitance mismatch, transconductance mismatch, and bitline load capacitance mismatch is derived. The mathematical methods used in the derivation of the formula are described in detail. The formula yields insight on the DRAM sensing operation. The perturbation approach used is novel and rigorous and yields an explicit closed-form solution. The formula agrees well with simulations. It is inherently slightly conservative and thus appropriate for use in design.< >

关键词： MOS devices Threshold voltage Parasitic capacitance Transconductance Differential amplifiers Random access memory Closed-form solution Signal restoration Fabrication Optimal control

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Broadcast with partial knowledge 91

Broadcast with partial knowledge

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10th Annual ACM Symposium on Principles of Distributed Computing, PODC 1991

作者： Awerbuch, Baruch Cidon, Israel Kutten, Shay Mansour, Yishay Peleg, David Dept. of Mathematics and Lab. for Computer Science M.I.T CambridgeMA02139 United States IBM T.J. Watson Research Center P.O. Box 704 Yorktown HeightsNY10598 United States Faculty of Electrical Engineering Technion Haifa32000 Israel Aiken Computation Laboratory Harvard University CambridgeMA02138 United States Department of Applied Mathematics and Computer Science Weizmann Institute Rehovot76100 Israel

ISBN: (纸本)0897914392

This work concerns the problem of broadcasting a large message efficiently when each processor has partial prior knowledge about the contents of the broadcast message. The partial information held by the processors might be out of date or otherwise erroneous, and consequently, different processors may hold conflicting information. Tight bounds are established for broadcast under such conditions, and applications of the broadcast protocol to other distributed computing problems are discussed. © 1991 ACM.

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An explicit model-matching approach to lateral-axis autopilot design

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IEEE control Systems Magazine 1990年第4期10卷 22-28页

作者： K.D. Minto J.H. Chow J.W. Beseler GECorporate Research and Development Center Schenectady Control Systems Laboratory NY USA Electrical Systems and Computer Engineering Department Rensselaer Polytechnic Institute Troy NY USA

The application of a linear multivariable control law design methodology to an autopilot design for large transport aircraft is described. The design method is an explicit model-matching approach, whereby compensator parameters are tuned via a least-squares optimization approach to minimize the error between the desired and the actual closed-loop frequency responses. This method incorporates some recent theoretical advances, including controller parameterization and plant factorization, and has been implemented within the ISICLE software package, a MATLAB-based control design toolbox. A desirable feature of the ISICLE design software is the capability to constrain the compensator dynamic order and structure, issues motivated by the necessity for low complexity implementations in order to simplify gain scheduling and limit protection.< >

关键词： Mathematical model Design methodology Aircraft Aerospace control Design optimization Frequency Software packages computer languages control design Software design

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