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FDTD approach to time-domain inverse scattering problem for stratified lossy media

MICROWAVE AND OPTICAL technology LETTERS 1997年第5期16卷 292-296页

作者： Takenaka, T Tanaka, T Harada, H He, SL Department of Electrical Engineering and Computer Science Nagasaki University Nagasaki 852 Japan Department of Control Engineering Kagoshima National College of Technology Kagoshima 899-51 Japan Department of Electromagnetic Theory Royal Institute of Technology S-100 44 Stockholm Sweden

An iterative approach is developed for reconstructing electrical parameters of stratified lossy media using time-domain reflection and/or transmission data. The finite-difference time-domain (FDTD) method is used. Numerical simulations are performed to reconstruct the images of lossy dielectric slabs with high-contrast permittivity. (C) 1997 John Wiley & Sons, Inc.

关键词： inverse scattering problem time domain finite-difference time domain optimization stratified slab

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Immobilization of microorganisms using carrageenan gels coated with chitosan and application to biodegradation of 4-chlorophenol

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Journal of Environmental Sciences 1997年第3期9卷 30-34页

作者： Wang Jianlong Li Ping Shi Hanchang Qian Yi China Zhou Ding Environment Simulationand Pollution Control State Key Joint Laboratory Department of Environmental EngineeringTsinghua UniversityBeijing 100084 Department of Applied Chemistry Harbin Institute of TechnologyHarbin150001China

A new cell immobilization method based on the replacement of KCl by KCl+chitosan as the gelling agent was developed. The experimental results showed that through addition of chitosan into gelling agent, the mechanical strength and the thermal stability of the carrageenan gel were greatly improved. The new immobilization method was used to entrap a chlorophenol degrading microorganism. The immobilized microbial cells were applied for chlorophenol biodegradation. The experiments demonstrated that immobilized cells exhibit a higher bioactivity in the degradation of chlorophenol than free cells.

关键词： carrageenan chitosan immobilization 4 chlorophenol biodegradation.

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Improved LMS adaptive algorithm with varying stepsize

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Chinese Science Bulletin 1996年第18期41卷 1568-1571页

作者：朱贤阳李敬任朗汪文秉 Institute of Electromagnetic Theory & Microwave Technology Southwest Jiaotong UniversityChengdu 610031 China Department of Information & Control Engineering Xi'an Jiaotong University Xi'an 710049 China

In the field of system identification, the coefficients of a digital filter, which are used to illustrate the transfer function of a system, are often fixed by known input and output signal sequences. The least mean square (LMS) adaptive algorithm is often used for its small computational requirement and convergence ***, the input or the output signal sequence often contains directive current (DC) components. What is the effect of the DC component upon the adaptive algorithm? This is just the main objective of this note. Here we propose an improved LMS adaptive algorithm with varying stepsize, which is based on the DC components analyzing.

关键词： LMS adaptive algorithm system identification directive currents.

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A New CMAC Neural Network Model with Adaptive Quantization Input Layer

A New CMAC Neural Network Model with Adaptive Quantization I...

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1996 3rd International Conference on Signal Processing(ICSP’96)

作者： GAO Xiaozhi WANG Changhong X.M.Gao Seppo J.Ovaska Department of Control Engineering P.O.Box 329Harbin Institute of Technology

＜正＞In this paper,we first discuss the structure, principle and learning algorithm of CMAC neural network model.A new adaptive quantization method based on competitive learning is then proposed to quantimize the inputs of CMAC according to the degree of variations of the approximated *** analysis and simulation results show that with the input layer using this algorithm CMAC can approximate more accurately and efficiently than the original model using equal-size quantization method.

关键词： Neural networks Adaptive systems Quantization Signal processing algorithms Function approximation control engineering Laboratories Algorithm design and analysis Arithmetic Robots

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Generation of structured process models using genetic programming 3rd

Generation of structured process models using genetic progra...

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3rd Workshop on Artificial Intelligence and Simulation of Behaviour, AISB 1996

作者： Pohlheim, Hartmut Marenbaeh, Peter Daimler Benz AG Systems Technology Research Alt-Moabit 96a BerlinD-10559 Germany Darmstadt University of Technology Institute of Control Engineering Department of Systems Theory and Robotics Landgraf-Georg-Strare 4 DarmstadtD-64283 Germany

ISBN: (纸本)3540617493

The design of structured mathematical models of processes in a certain level of abstraction defined by the given task appears to be difficult and time consuming even for experienced experts. This paper reports on a new method for the design of structured process models based on the metaphor of Genetic Programming. This new methodology allows the automatic generation of non-linear process models in a self-organizing way. © Springer-Verlag Berlin Heidelberg 1996.

关键词： Genetic algorithms

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Simple connectivity of the D-stability domain and D-stability of polynomial families

Simple connectivity of the D-stability domain and D-stabilit...

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IEEE Conference on Decision and control

作者： Guang-Ren Duan Zhong-Xian Wang Department of Control Engineering Harbin Institute of Technology Harbin Heilongjiang China Department of Information and Decision Sciences Montclair State University NJ USA

ISBN: (纸本)0780335902

It is proved that all monic-polynomials of order n with roots lying in some open region on the complex plane forms a simply connected set in the polynomial parameter space. Based on this result, edge theorems for D-stability of general polyhedrons of polynomials and boundary theorems for D-stability of compact sets of polynomials are obtained. Different from previous ones, our edge theorems and boundary theorems do not require the convexity or the connectivity of the set of polynomials. Moreover, our boundary theorem for families of polynomials with dependent coefficients does not require the coefficient dependency relation to be affine.

关键词： Polynomials Space technology control engineering Stability analysis Vectors Erbium Hafnium Gold

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control system design for an ideal transient control performance - Proposal of simulator-based foresight control

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ELECTRICAL engineering IN JAPAN 1996年第5期116卷 107-117页

作者： Uchida, M Nakano, K Fukuoka Institute of Technology Fukuoka Japan 811-02 [?]Graduated from Kyushu University in 1958 and received his Dr. of Eng. degree from there. He joined Kyushu Electric Power Co. Inc. and there he engaged in the planning construction operation and maintenance of thermal power plants as the technical staffer section chief assistant manager and superintendent. Since 1994 he has been a Professor in the Department of Electrical Engineering Fukuoka Institute of Technology Japan. His main interest is in the application of modern control theory to actual plants. For his contribution to this field he was awarded the Okochi Memorial Technical Prize and SICE Technical Prize in 1980. He is a member of the Society of Institute of Instrument and Control Engineers of Japan (SICE).

A new concept to achieve an ideal transient control performance is described. It is also possible to examine control performance on the frequency domain. Generally speaking, better control performance will be realized by using more exact information on the plant. A simulator should be built that has both correct initial values of state variables and parameters on dominant parts of the plant. The internal states of the simulator are used to represent the internal states of the plant, and control input is synthesized with the internal states of the simulator and the plant output. Using information on the simulator allows an ideal control performance at a dominant frequency area to be obtained in spite of the existence of unmodeled dynamics at a higher frequency domain. This control system is called simulator-based foresight control (SFC), and is available for both nonlinear and time-varying plants.

关键词： small controller large-scale plant simulator-based foresight control nonlinear systems

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Methods for a Transparent Development and Optimization of Biotechnological Processes

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IFAC Proceedings Volumes 1996年第1期29卷 6768-6773页

作者： Peter Marenbach Kurt Dirk Bettenhausen Henning Tolle Darmstadt University of Technology Institute of Control Engineering Department of Control Systems Theory & Robotics Landgraf-Georg-Strasse 4 D-64283 Darmstadt Germany URL: http //www.rt.e-technik.th-darmstadt.de

The article at hand describes an integrating system for the intelligent control of complex bio technological processes including automatic modelling and model based control strategy generation. Starting with a summary of previously achieved results, some new approaches that provide better transparency to process engineers and operators are discussed. This includes aspects of self-organizing generation of structured dynamic nonlinear process models based upon the ideas of genetic programming as well as the transparent generation of fuzzy rules in a particular NeuroFuzzy approach. The latter is used for the classification of physiological states during batch and fed-batch fermentations and for the long time strategy generation to optimize the achievable product yield.

关键词： Biotechnology Process control Fuzzy systems Learning control Genetic algorithms

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A modified Elman neural network model with application to dynamical systems identification

A modified Elman neural network model with application to dy...

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IEEE International Conference on Systems, Man and Cybernetics

作者： X.Z. Gao X.M. Gao S.J. Ovaska Department of Control Engineering Harbin Institute of Technology Harbin China Laboratory of Telecommunications Technology Helsinki University of Technology Espoo Finland Laboratory of Electrical Drives and Power Electronics Helsinki University of Technology Espoo Finland

In this paper, an overview of the structure and learning algorithm of the Elman neural network is first presented. A modified Elman network is then proposed by adding new adjustable weights that connect the context nodes with output nodes. Convergence speed of the two network structures are compared. A parallel dynamic system identification scheme based on the modified Elman network is set up as well. Theoretical analysis and simulation results show that our improved neural network-based identification method has the advantage of identifying both linear and nonlinear dynamic systems without any prior knowledge of their orders and structures.

关键词： Neural networks System identification Nonlinear dynamical systems Laboratories Feedforward neural networks Feedforward systems control engineering Power electronics Analytical models Recurrent neural networks

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A new algorithm for transient analysis of electromagnetic wave systems

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ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS 1996年第5期79卷 48-57页

作者： Kuroiwa, T Hosono, T Department of Electrical Engineering College of Science and Technology Nihon University Japan Received his B.E. and M.E. degrees from the Department of Precision Mechanical Engineering Nihon University in 1987 and 1989 respectively. He received his Ph.D. degree in Electrical Engineering from Nihon University in 1995. In 1995 he became a Lecturer in the Department of Electrical Engineering. He has been engaged in research on control theory network theory and electromagnetic theory. Received his B.E. degree in 1946 from the Department of Electrical Engineering Nihon University. He was a special postgraduate student at Tokyo University where he received his Ph.D. degree in 1958. In 1960 he became a Professor at Nihon University. Since 1994 he has been Professor Emeritus. He was a Visiting Scholar at the University of Illinois and a Visiting Professor at Kuwait University. He was Chairman of Group on Electromagnetic Theory of the Institute of Electrical Engineers of Japan and Editorial Advisor of I.E.I.C.E. He is the author ofFundamentals of Information Engineering Fundamentals of linear Black Boxes Science of Entropy(Corona Publ.) Fundamentals of Electromagnetic Waves(Shokodo Publ.) andFast Inversion of Laplace Transform by BASIC(Kyoritsu Publ.). He is coauthor ofModern Analysis of Electromagnetic Fields(I.E.I.C.E.).

In the analysis of a general linear system including the electromagnetic wave transmission systems, it is often necessary to derive system functions such as the immittance function and the transfer function from the frequency characteristics. In solving these problems, it is possible to use the Herglotz-Cauer theorem for the immittance function and Hosono's theorem for the transfer function. In these theorems, it is necessary to calculate integrals on the frequency when the system function is derived. There are a limited number of cases that can be solved analytically. However, when Hosono's theorem is combined with the fast inversion of Laplace transform (FILT), it is predicted that such a combination is a powerful tool for analyzing the transient phenomena of the electromagnetic wave propagating in plasma, wave-guides, and optical fibers. To confirm such a prediction, the transient phenomena of the electromagnetic wave propagating in a plasma were analyzed as an example so that the effectiveness was supported.

关键词： Herglotz-Cauer theorem Hosono's theorem FILT electromagnetic wave transient phenomena

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