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An effective uniform genetic algorithm for hard optimization problems

An effective uniform genetic algorithm for hard optimization...

引用

Proceedings of the 3th World Congress on Intelligent control and Automation

作者： Wang, Yuping Liu, Hailin Leung, Yiu-Wing Faculty of Science Xidian University Xi'an China Dept. of Automatic Control Eng. South China University of Technol. Guangzhou China Dept. of Computer Science Hong Kong Baptist University Hong Kong Hong Kong

Genetic algorithms are one of the effective algorithms for hard optimization problems. They can escape from the local minima, however, the amount of their computation is often large. To decrease the amount of the computation and enhance the algorithms, the uniform design is combined into the genetic algorithm. The new genetic operator has the local-search property similar to that in traditional optimization techniques and needs a minimal amount of computation in certain meaning. Thus the new genetic algorithm can generate a diversity of population and explore the search space effectively. Moreover, the new algorithm is globally convergent. The numerical results also show the effectiveness of the new algorithm with its less computation, higher convergent speed for all test functions.

关键词： Problem solving

来源：评论

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Fast algorithms for identification of rapidly fading channels

Fast algorithms for identification of rapidly fading channel...

引用

European Signal Processing Conference (EUSIPCO)

作者： Maciej Niedźwiecki Tomasz Kłaput Faculty of Electronics Telecommunications and Computer Science Department of Automatic Control Technical University of Gdańsk ul. Narutowicza 11/12 Gdańsk Poland

The problem of identification/tracking of rapidly fading communication channels is considered. When the channel coefficients vary rapidly with time the most frequently used weighted least squares (WLS) and least mean squares (LMS) algorithms are not capable of tracking the changes satisfactorily. To obtain good estimation results one has to use more specialized adaptive filters, such as the basis function (BF) algorithms which are based on explicit models of parameter changes. Unfortunately, estimators of this kind are numerically very demanding. The paper introduces a new class of recursive algorithms which combine low computational requirements, typical of WLS and LMS filters, with very good tracking capabilities, typical of BF filters.

关键词： Mean square error methods

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Fast recursive basis functions estimators for identification of time-varying processes

Fast recursive basis functions estimators for identification...

引用

International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： M. Niedzwiecki T. Klaput Faculty of Electronics Telecommunications and Computer Science Department of Automatic Control Technical University of Gdańsk Gdansk Poland Politechnika Gdanska Gdansk WojewÃ³dztwo pomorskie PL

When system parameters vary rapidly with time the weighted least squares filters are not capable of following the changes satisfactorily-some more elaborate estimation schemes, based on the method of basis functions, have to be used instead. The basis functions estimators have increased tracking capabilities but are computationally very demanding. The paper introduces a new class of adaptive filters, based on the concept of postfiltering, which have improved parameter tracking capabilities, typical of the basis functions algorithms, but, at the same time, have pretty low computational requirements, typical of the weighted least squares algorithms.

关键词： Recursive estimation Least squares approximation Least squares methods Finite impulse response filter Time varying systems computer science Adaptive filters Noise measurement White noise History

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An effective uniform genetic algorithm for hard optimization problems

An effective uniform genetic algorithm for hard optimization...

引用

World Congress on Intelligent control and Automation (WCICA)

作者： Wang Yuping Liu Hailin Yiu-Wing Leung Faculty of Science Xidian University Xi'an China Department of Automatic Control Engineering South China University of Technology Guangzhou China Department of Computer Scienc Hong Kong Baptist University Hong Kong China

Genetic algorithms are one of the effective algorithms for hard optimization problems. They can escape from the local minima, however, the amount of their computation is often large. To decrease the amount of the computation and enhance the algorithms, the uniform design is combined into the genetic algorithm. The new genetic operator has the local-search property similar to that in traditional optimization techniques and needs a minimal amount of computation in certain meanings. Thus the new genetic algorithm can generate a diversity of population and explore the search space effectively. Moreover, the new algorithm is globally convergent. The numerical results also show the effectiveness of the new algorithm with its less computation, and higher convergent speed for all test functions.

关键词： Genetic algorithms Algorithm design and analysis Space exploration Scattering Optimization methods automatic control Genetic engineering Testing Engineering management Operations research

来源：评论

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Robust CGPC design via simple Youla parameterisation

Robust CGPC design via simple Youla parameterisation

引用

1999 European control Conference, ECC 1999

作者： Kowalczuk, Z. Suchomski, P. Department of Automatic Control Faculty of Electronics Telecommunication and Computer Science Technical University of Gdańsk Narutowicza 11/12 Gdańsk80-952 Poland

ISBN: (纸本)9783952417355

The main objective of this contribution is a new development of the continuous-time generalised predictive control (CGPC) resulting in a Youla-based CGPC design procedure for both minimumphase and nonminimum-phase uncertain SISO systems. The derived design procedure consists of two steps. In the first step nominal stability and nominal performance of the control system are established by using a fully analytical design methodology, based on a collection of closed-loop prototype characteristics with definite time-domain specifications. In the second step, the primary structure of the CGPC controller is suitably enriched by 'Youla' blocks guaranteeing that the resulting CGPC control system has the required robustness properties, i.e. robust stability and robust performance. © 1999 EUCA.

关键词： Robust control

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Structure and performance evaluation of a replicated banyan network based ATM switch

Structure and performance evaluation of a replicated banyan ...

引用

IEEE Symposium on computers and Communications (ISCC)

作者： M.A. Youssef M.N. El-Derini H.H. Aly Department of Computer Science and Automatic Control Faculty of Engineering Alexandria University Egypt

Banyan networks are commonly used as interconnection structures in ATM switches. This paper is concerned with the replication technique which was applied to the standard banyan networks. We apply this technique to the plane interconnected parallel network (PIPN) which is a switch introduced previously as a better banyan-based interconnection structure. The normalized throughput of unbuffered and buffered replicated PIPN is analyzed analytically under uniform traffic model. We apply the simulation technique to verify the analytical results under the uniform traffic model and to study the performance of different heterogeneous traffic models. The performance is shown to increase significantly when the replicated PIPN is used which supports the idea of using this switch as a new high-performance ATM switch.

关键词： Asynchronous transfer mode Throughput Telecommunication traffic Traffic control Optical switches Bandwidth Very large scale integration computer science automatic control Analytical models

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Smart copying-a new approach to reconstruction of audio signals

Smart copying-a new approach to reconstruction of audio sign...

引用

IEEE International Symposium on Circuits and Systems (ISCAS)

作者： K. Cisowski M. Niedzwiecki Department of Automatic Control Faculty of Electronics Telecommunications and Computer Science Technical University Gdansk Poland Politechnika Gdanska Gdansk WojewÃ³dztwo pomorskie PL

The paper presents a new approach to reconstruction of audio signals. First, a general reconstruction formula is derived allowing one to estimate unknown samples from the known (neighboring) ones. Then it is shown that the unknown excitation appearing in the analytical reconstruction formula can be replaced with the natural excitation waveform extracted from the available portions of the signal.

关键词： Speech enhancement Acoustic noise Fading Implants White noise Speech synthesis computer science Signal analysis Signal processing Digital signal processing

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Adaptive decentralized vibration control of a cable-stayed bridge in the presence of seismic excitation

Adaptive decentralized vibration control of a cable-stayed b...

引用

ASME 1999 Design Engineering Technical Conferences, DETC 1999

作者： Luo, Ningsu Rodellar, Jose Sen, Manuel De La Veh, Josep Campus Montilivi P-ll Dept of Electronics Automatic Control and Computer Engineering University of Girona Girona17071 Spain Department of Applied Mathematics III School of Civil Engineering Technical University of Catalonia Barcelona08034 Spain Department of Electricity and Electronics Faculty of Science University of Basque Country Bizkaia Leioa48940 Spain

ISBN: (纸本)9780791819760

In this paper, an adaptive decentralized controller is presented to attenuate the transversal vibration of a flexible cablestayed bridge induced by seismic excitation, in which only local sensor information has been used to generate the control signal that is sent to the actuator. The dynamic behavior of the beam structure is characterized by a nonlinear mathematical model with interconnection terms, which was obtained by using technique of finite element. The controller design is made based on the principle of sliding mode such that a priori knowledge on the exact value of system parameters, structural disturbances and the seismiic excitation is not required. In particular, it is assumed that the upper and lower bounds for the seismic excitation are also unknown. The closed-loop robust stability has been achieved through the generation of a sliding motion in the system. Nu-merical simulation is done to illustrate the effectiveness of the proposed control scheme for a scaled model of the bridge subject to the Taft earthquake. © 1999 American Society of Mechanical Engineers (ASME). All rights reserved.

关键词： controllers

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Robust CGPC design via simple Youla parameterisation

Robust CGPC design via simple Youla parameterisation

引用

European control Conference (ECC)

作者： Z. Kowalczuk P. Suchomski Department of Automatic Control Faculty of Electronics Telecommunication and Computer Science Technical University of Gdańsk Narutowicza 11/12 P.O. Box 612 80-952 Gdańsk Poland

The main objective of this contribution is a new development of the continuous-time generalised predictive control (CGPC) resulting in a Youla-based CGPC design procedure for both minimumphase and nonminimum-phase uncertain SISO systems. The derived design procedure consists of two steps. In the first step nominal stability and nominal performance of the control system are established by using a fully analytical design methodology, based on a collection of closed-loop prototype characteristics with definite time-domain specifications. In the second step, the primary structure of the CGPC controller is suitably enriched by `Youla' blocks guaranteeing that the resulting CGPC control system has the required robustness properties, i.e. robust stability and robust performance.

关键词： Robustness Polynomials control systems Sensitivity Uncertainty Noise Observers

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Behavior of task scheduling algorithms with probabilistic module execution times

Behavior of task scheduling algorithms with probabilistic mo...

引用

IEEE Symposium on computers and Communications (ISCC)

作者： M. Kholief I. Awad M. El-Derini M. Nagi H. Ali Department of Computer Science Old Dominion University Norfolk VA USA Department of Computer Science and Automatic Control Faculty of Engineering Alexandria University Alexandria Egypt

Static task scheduling in distributed computing systems is a very complex problem and known to be NP-hard. This problem is even harder when the module execution times become probabilistic. In this paper we study the effect of probabilistic module execution times on the performance of task-scheduling algorithms. We show that in static task scheduling, for probabilistic module execution times, and in the existence of some factors there is no need to use an expensive task-scheduling algorithm. Given any two static task-scheduling algorithms that use deterministic module execution times in assigning task modules to the distributed system, the performance of these two algorithms will not remain the same when these module execution times become probabilistic rather than deterministic. We also study the effects of some factors an our results.

关键词： Scheduling algorithm Processor scheduling computer science automatic control Read only memory Distributed computing Heuristic algorithms State-space methods

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