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Distributed algorithms: 5th International Workshop, WDAG '91 Delphi, Greece, October 7-9, 1991 Proceedings 5th

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5th International Workshop on Distributed Algorithms, WDAG 1991

作者： Toueg, Sam Spirakis, Paul G. Kirousis, Lefteris Dept. of Computer Science Cornell University 4106 Upson Hall IthacaNY14853 United States Dept. of Computer Science and Engineering and Computer Technology Institute Patras University P. O. Box 1122 Patras26110 Greece Dept. of Computer Engineering and Informatics Patras University P. O. Box 1045 Patras26110 Greece

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Optimal dynamic fitting and identification of aerobomb's fitting drag coefficient curve 1

Optimal dynamic fitting and identification of aerobomb's fit...

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1st IEEE Conference on Control Applications, CCA 1992

作者： Chen, Yangquan Lu, Deye Dou, Huifang Qing, Yingxiao Computer Application Research Group Dept. of Electrical Engineering Xi'in Inst. of Tech. Box 209 Xi'an710032 China Technical Support Center Baichen Proving Ground Baichen Jiling137001 China Mechatronics Research Group Dept. of Mechanical Engineering Xi'an Inst. of Tech. Xi'an710032 China PLA Lanzhou Airforce Xi'an710045 China

ISBN: (纸本)0780300475

Optimal dynamic fitting concept is proposed and applied to an aero-dynamic coefficient curve identification problem. Extracting aerobomb's optimal fitting drag coefficient curve Cdf(M) from 3-dimensional theolo-dite film data is reguarded as an optimal trucking control problem(OTCP) where Cdf(M) is control profile. From engineering application point of view, with some parametric description structure for Cdf(M), this functional minimization problem(OTCP) is converted to multivariable minimization problem. Cubic splines with deficiency 2 is employed to guarantee thecontinuity and fitting flexibility of Cdf(M). The quasi-Newton-Raphson iterative scheme is used to reduce the computational cost. The correction of initial states of trajectory eqations is discussed also. Practical test data reduction results of three bombing flight paths show that the optimal dynamic fitting concept has great applicable potentials in aerodynamic coefficient CURVE identification and in other similar application cases. The identified optimal fitting drag coefficient curve Cdf(M) can find its positive position in the applications like more accurate bombing table generation and mechanism studies about interference air flow field between aircraft and aerobombs etc.. © 1992 IEEE.

关键词： Data reduction

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Time-frequency fine structure of dolphin whistles

Time-frequency fine structure of dolphin whistles

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

作者： Tyack, P.L. Williams, W.J. Cunningham, G. Dept. of Biol. Woods Hole Oceanogr. Inst. Woods HoleMA02543 United States Department of Electrical Engineering and Computer Science University of Michigan Ann ArborMI48109 United States

ISBN: (纸本)0780308050

The analysis of marine mammal sounds has been a subject of considerable interest for a number of years. The tool of choice for revealing the timefrequency characteristics of these sounds has been the spectrogram (sonogram). The timefrequency resolution trade-offs inherent in the spectrogram do not permit the examination of both time and frequency fine structure, whereas the newer time-frequency distributions do provide a considerably improved result. Comparisons of spectrogram, Wigner distribution and RID results are presented in this paper. © 1992 IEEE.

关键词： Mammals

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PWM control and input characteristics of three-phase multi-level AC/DC converter

PWM control and input characteristics of three-phase multi-l...

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Annual IEEE Conference on Power Electronics Specialists (PESC)

作者： T. Takeshita N. Matsui Dept. of Electr. & Comput. Eng. Nagoya Inst. of Technol. Japan Department of Electrical and Computer Engineering Nagoya Institute of Technology Nagoya Japan

The authors discuss the current control and pulse width modulation (PWM) pattern generation of a multilevel power converter which is capable of producing three levels of phase voltage. In the proposed current control, fast response is realized by introducing a converter model in the control algorithm and the effect of parameter difference between the model and an actual system is compensated for through proportional-plus-integral control of current difference. In PWM pattern generation, the balance of two capacitor voltages is taken into account. For the same sampling period, the current distortion factor of the proposed system can be approximately reduced to 60% of that of a conventional two-level power converter. The prototype was made using a digital signal processor, and simulation and experimental results were compared.< >

关键词： Pulse width modulation Pulse width modulation converters Current control Power system modeling Proportional control Phase modulation Power generation Pulse generation Signal processing algorithms Capacitors

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Formal specification of fault management system using O-Estelle

Formal specification of fault management system using O-Este...

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International Conference on Communication Systems

作者： B. Prahbhakaran K. Vijayananda S.V. Raghavan Dept. of Comput. Sci. & Eng. Indian Inst. of Technol. Madras India Department of Computer Science & Engineering Indian Institute of Technology Madras India

The authors discuss the formal description of a real time application, viz a fault management system (FMS) for the OSI environment, using O-Estelle. O-Estelle is an object oriented specification language that has been proposed by the authors for describing real time applications (Prabhakaran and Ragahvan, 1990). O-Estelle is an Estelle based language with extended features. A distributed FMS is a set of fault managers running concurrently on several systems. It is the responsibility of the fault manager (FM) on each system to detect, isolate and possibly rectify the faults in the system. Management services are provided to the FM to perform its tasks and to communicate with FMs on other systems. The formal description of such a distributed application requires additional features in description languages like Estelle. O-Estelle description of the FMS can be used for protocol verification and semiautomatic generation of software for FMS.< >

关键词： Formal specifications Flexible manufacturing systems Fault detection computer network management computer errors Error analysis Real time systems Object oriented modeling Application software computer science

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A robust source/channel coding and modulation technique for bandwidth efficient transmission

A robust source/channel coding and modulation technique for ...

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IEEE Conference on Vehicular technology (VTC)

作者： G.E. Atkin B. Patel Dept. of Electr. & Comput. Eng. Illinois Inst. of Technol. Chicago IL USA Electrical and Computer Engineering Department Illinois Institute of Technology Chicago IL USA

A combined source encoding and modulation technique based on permutation codes is described. This combined system directly maps the source codewords into modulation symbols. This system offers improvement in terms of better overall fidelity, reduced encoding delay, and robustness. Nearly optimal codes for Gaussian and Laplacian sources in the presence of an AWGN channel are obtained. The performance of these codes and the combined system is evaluated and compared with other existing systems.< >

关键词： Robustness Channel coding Modulation coding Bandwidth Personal communication networks Distortion measurement Delay Bit rate Encoding Laplace equations

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Associating an image by network constraint analysis

Associating an image by network constraint analysis

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International Conference on Pattern Recognition

作者： S. Ishikawa K. Kato Department of Electrical Electronic and Computer Engineering Kyushu Institute of Technology Kitakyushu Japan Dept. of Electr. Electron. & Comput. Eng. Kyushu Inst. of Technol. Kitakyushu Japan

A technique for associating an image is described in terms of the network constraint analysis. Pixels and their gray-values are called units and labels, respectively, and a set of n pixels called the unit constraint set T provides the unit-label constraint set R for memorized images. Given an incomplete image X which can have occlusion, noise, distortion, etc., R receives screening by X to yield the reduced set R* (R* contained in R), since the elements of X constrain the elements in R. A dept. first search is then applied to the elements of R* to obtain consistent solutions, if any, which are associated images. The proposed technique is free from the interference among memorized images which other association techniques suffer from. An iterative technique is also proposed for speeding up the dept. first search. Performance of the proposed association technique is shown by the experiment employing 26 alphabetical letters.< >

关键词： Image analysis Pixel Image recognition computer networks Noise reduction Humans Neural networks Proposals Interference constraints Shape

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The development of a knowledge-based software fault localization system

The development of a knowledge-based software fault localiza...

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IEEE International Conference on Systems, Man and Cybernetics

作者： I. Burnstein N. Jani S. Mannina J. Tamsevicius M. Goldshteyn L. Lendi Computer Science Department Illinois Institute of Technology Chicago IL USA Dept. of Comput. Sci. Illinois Inst. of Technol. Chicago IL USA

A multifaceted approach to automation of the software fault localization process is proposed. The facets include the development of a conceptual process model derived from empirical studies; the implementation of a blackboard-based fault localization tool built on model underpinnings, and tool integration in a computer-aided software engineering (CASE) environment that will provide long term support for its functionality and expandability. The authors report on the progress in modeling studies and development of the tool architecture.< >

关键词： Software systems computer aided software engineering Programming profession Software tools Software debugging computer science Automation computer architecture Application software Knowledge engineering

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Optimal control of a hybrid system with pathwise average cost

Optimal control of a hybrid system with pathwise average cos...

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IEEE Conference on Decision and Control

作者： M.K. Ghosh A. Arapostathis S.I. Marcus Dept. of Math Indian Inst. of Sci. Bangalore India Department of Electrical and Computer Engineering University of Technology Austin TX USA Electrical Engineering Department and Systems Reseacrh Center University of Maryland College Park MD USA

The authors study the ergodic control problem of switching diffusions of representing a typical hybrid system that arises in numerous applications such as fault-tolerant control systems and flexible manufacturing systems. Under certain conditions, they establish the existence of a stable Markov nonrandomized policy which is almost certainly optimal for the pathwise long-run average cost criterion. They they study the corresponding Hamilton-Jacobi-Bellman (HJB) equation and establish the existence of a unique solution in a certain class. Using this, they characterize the optimal policy as a minimizing selector of the Hamiltonian associated with the HJB equations. They apply these results to a failure-prone manufacturing system and show that the optimal production rate is of the hedging point type.< >

关键词： Optimal control Cost function Control systems Equations Fault tolerant systems Flexible manufacturing systems Manufacturing systems Production systems

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Applying variations of the quantitative feedback technique (QFT) to unstable, non-minimum phase aircraft dynamics models

Applying variations of the quantitative feedback technique (...

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IEEE National Conference on Aerospace and Electronics (NAECON)

作者： M.A. McClure R.N. Paschalle Department of Electrical and Computer Engineering Air Force Institute of Technology OH USA Dept. of Electr. & Comput. Eng. Air Force Inst. of Technol. Wright-Patterson AFB OH USA

Variations of the quantitative feedback technique (QFT) are applied to a multi-input-multi-output (MIMO) flight control problem with unstable, nonminimum phase plants. The authors present specialized techniques that enable the designer to achieve acceptable results for effective plants which are both unstable and non-minimum phase. The weighting matrix function is discussed, and a method of developing frequency dependent compensation is presented. The longitudinal control system, defined as a single-input-single-output (SISO) system, is designed using the loop transmission function. The limitations imposed by right-half-plane poles and zeros are discussed as the design is presented. A straightforward approach to designing a prefilter is also presented. Singular-G and optimal blending methods are used to improve the achievable stability characteristics of the lateral-directional (MIMO) effective plant. A brief discussion of the design of prefilters for a MIMO system is included.< >

关键词： Feedback Aerospace control Aerodynamics State-space methods Aircraft propulsion Military aircraft MIMO Open loop systems Control systems Poles and zeros

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