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A Novel Adaptive Control System for Raw Material Blending

IEEE Control Systems 2003年第1期23卷 87-96页

作者： Banyasz, Cs Keviczky, L. Vajk, Istvan Computer and Automation Research Institute Hungarian Academy of Sciences H-1111 Budapest Kende u 13-17 Hungary Department of Automation and Applied Informatics Budapest University of Technology and Economics H-1111 Budapest Hungary

We discuss a new generic optimal controller structure for raw material blending in the cement industry. We focus on an important phase of the proportioning-burning-grinding operation triplet that essentially determines the cement quality; namely, the composition control of the raw mill system. We begin by describing the application of a generic optimal controller structure to this important phase, followed by a discussion of the control engineering background and the design of the realized controller. Finally, the control algorithm is discussed in a technology-independent manner.

关键词： Adaptive control Raw materials Building materials Automation Material storage Optimal control Milling machines Production facilities Automatic control Proportional control

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A sleep-awake protocol for information propagation in smart dust networks

A sleep-awake protocol for information propagation in smart ...

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International Symposium on Parallel and Distributed Processing (IPDPS)

作者： I. Chatzigiannakis S. Nikoletseas Computer Engineering and Informatics Department University of Patras Patras Greece Computer Technology Institute Patras Greece

Smart dust is a set of a vast number of ultra-small fully autonomous computing and communication devices, with very restricted energy and computing capabilities, that co-operate to quickly and efficiently accomplish a large sensing task. Smart dust can be very useful in practice i.e. in the local detection of a remote crucial event and the propagation of data reporting its realization. In this work we continue our effort towards the research on smart dust from a basic algorithmic point of view. Under a simple but realistic model for smart dust we present an interesting problem, which is how to propagate efficiently information on an event detected locally. Then we present anew smart dust protocol, which we call the "Sleep-Awake" protocol, for information propagation that explicitly uses the energy saving features (i.e. the alteration of sleeping and awake time periods) of the smart dust particles. By using both some simple probabilistic analysis and extensive experiments, we provide some first concrete results for the success probability and the time and energy efficiency of the protocol, in terms of parameters of the smart dust network. We note that the study of the interplay of these parameters allows us to program the smart dust network characteristics accordingly.

关键词： Protocols Intelligent networks Intelligent sensors Vehicle dynamics Event detection Sensor systems computer networks Temperature sensors Sensor phenomena and characterization Remote monitoring

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A scalable, low-cost VoD server with multicast support

A scalable, low-cost VoD server with multicast support

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International Conference on Information technology: research and Education (ITRE)

作者： A. Papagiannis S. Egglezos D. Lioupis Department of Computer Engineering & Informatics University of Patras Patras Greece Computer Technology Institute Patras Greece

Undoubtedly, video-on-demand technology will play a catalytic role in future entertainment and e-learning systems. The key challenge in VoD domain is to provide interactive services in thousands of potential users at a reasonable cost. We present a scalable, high performance, high availability and low cost VoD system design, based on a cluster of personal computer. The scalability of this design is not restricted to cluster-level, but it can easily be applied to a greater MAN-level. The experimental measurements indicated that our design can support simultaneously 90, 170 or 240 high quality video streams for implementations with 1, 2 or 3 server nodes respectively. We show, using queuing theory analysis that these figures correspond to thousands of real users. We also present a multicast method that further enriches our design increasing its reliability in periods of high demand.

关键词： Scalability Switches Costs Availability Microcomputers Video on demand Control systems Load management Communication switching informatics

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Design conditions for Space Vector Modulated three-phase converter to avoid instability

Design conditions for Space Vector Modulated three-phase con...

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2003 IEEE Bologna PowerTech Conference

作者： Süto, Z. Nagy, I. Department of Automation and Applied Informatics Budapest University of Technology and Economics Budafoki út 8 Budapest H-1111 Hungary Computer and Automation Research Institute Hungarian Academy of Science Budapest Hungary

ISBN: (纸本)0780379675

The analysis, design aspects and numerical results of a current controlled three-phase Space Vector Modulated (SVM) Voltage Source Converter (VSC) are presented. The aim of the current controller of VSC is to track the balanced three-phase sinusoidal reference currents. The current controller includes a complex saturation function in order to avoid overmodulation in the SVM, Due to this strong nonlinearity the study leads to rather unexpected system states. An approximate Poincare map is derived using stroboscopic sampling with the modulation period of the SVM. Selecting eigenvalues of the system linearized around the desired fixed point is not sufficient to the proper operation. Other stable fixed points or limit cycles can appear. Chaotic states also can develop in the unstable region of the desired fixed point. The main objectives are to develop the tools for describing the nonlinear behavior, for designing the digital PI controller and to present numerical results. © 2003 IEEE.

关键词： Electric current control

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xDSL systems prototyping using a flexible emulation environment

xDSL systems prototyping using a flexible emulation environm...

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International Workshop on Rapid System Prototyping (RSP)

作者： N. Papandreou M. Varsamou T. Antonakopoulos Academic Research Computer Technology Institute Patras Greece Department of Electrical Engineering University of Patras Patras Greece

In this paper we describe the methodology and architecture of a flexible modular environment for prototyping data transmission systems and its application on xDSL systems. The development environment is based on custom and commercially available software tools and a custom hardware emulation platform for mapping the basic data-pump modules of xDSL systems into hardware/software functional modules. The road-map from a high-level xDSL system model to the actual prototype is based on the progressive substitution of high-level submodules of the initial model with their respective hardware/software counterparts, and their integration into a complete functional system. A library of custom blocks is used for data exchange and synchronization between the high-level model and the emulation platform, and for real-time visualization of the critical parameters of the emulated system as well. The application of the proposed development environment in the implementation and testing of an emulator of a bundle of DSL lines and of a centralized bit-loading algorithm for multicarrier ADSL systems is also described.

关键词： Prototypes Emulation Software prototyping Hardware Application software Software tools computer architecture Data communication Software libraries Real time systems

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Architecture template and design flow to support application parallelism on reconfigurable platforms

Architecture template and design flow to support application...

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13th International Conference on Field-Programmable Logic and Applications, FPL 2003

作者： Sawitzki, Sergei Spallek, Rainer G. Philips Research Laboratories Prof. Holstlaan 4 Eindhoven5656AA Netherlands Institute of Computer Engineering Department of Computer Science Dresden University of Technology Dresden01062 Germany

ISBN: (纸本)3540408223

This paper introduces the ReSArT (Reconfigurable Scalable Architecture Template). Based on a suitable design space model, Re- SArT is parametrizable, scalable, and able to support all levels of parallelism. To derive architecture instances from the template, a design environment called DEfInE (Design Environment for ReSArT Instance Generation) is used, which integrates some existing academic and industrial tools with ReSArT-specific components, developed as a part of this work. Different architecture instances were tested with a set of 10 benchmark applications as a proof of concept, achieving a maximum degree of parallelism of 30 and an average degree of parallelism of nearly 20 16-bit operations per cycle. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Benchmarking

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Determination of the optimal disassembly sequence using decision trees

Determination of the optimal disassembly sequence using deci...

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2003 IFAC Workshop on Intelligent Assembly and Disassembly, IAD 2003

作者： Duta, L. Filip, F.Gh. Henrioud, J.M. Computer Science Department Valahia State University 18-24 Unirii Bvd. Targoviste Romania Research Institute for Informatics 8-10 Maresal Averescu Bucharest Romania Automation Laboratory Institute of Production Engineering 25 Alain Savary Besançon France

Disassembly is the first stage in the process of valorization of the manufactured goods. Due to the degradations of the components, the disassembly of the product could be impossible. In order to maximize the outcome obtained considering the uncertainty of the disassembly process one has to decide the depth of this process. Applying the tools of the decision theory the authors have proposed a method and an application allowing the determination of the optimal disassembly sequence taking into account the considered criterion. © 2003 IFAC.

关键词： Forestry

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A Fuzzy Inference System for Identifying Tissue Elasticity Using Ultrasound

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Journal of Advanced Computational Intelligence and Intelligent informatics 2003年第1期7卷 31-39页

作者： Kimura, Tadashi Nagamune, Kouki Kobashi, Syoji Kondo, Katsuya Hata, Yötaka Taniguchi, Kazuhiko Computer Engineering Divi-sion Graduated of Engineering Himeji Institute of Technology 2167 Himeji671-2201 Japan Computer Engineering Division Graduate School of Engineering Himeji Institute of Technology 2167 Shosha Himeji671-2201 Japan Research and Development Department Kinden Corporation 34-1 Saganakadai Souraku District Kizu-Cho619-0223 Japan

This pmposes a fuzzy rule-based appmach mr identifying tissue elasticity using ultrasound. The pur-of this identifies automatically tissue elastic-ity. Int rmation of tissue elasticity helps us to diagnose several diseases. Elastography was able to estimate tis-sue elasticity Howeveg this measurement range is lim-ited due to the need of pressure. avoid this limitation, this paper pmp(ßes the identification system without prssure. This inference system consists of two stages. In the first stage, fuzzy membership functions are con-structed by known data of elasticity The second stage identifies elasticity of unknown data by using the mem-functions. We used five different phantoms (total 5 x 10 = 50) of elasticity as known data and applied this system into nine different phantoms (total 9 x 10 = of elasticity as unknown data. As a result, the correlation actual value and identified value was 0.789 and the ermr of mean was 0.646. This system thus acquired smaller ermr ratio than that of the statistical meth(Xl. © 2003 Fuji technology Press. All rights reserved.

关键词： Fuzzy inference

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Nonlinear model structure identification of complex biomedical data using a genetic programming based technique

Nonlinear model structure identification of complex biomedic...

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IEEE International Symposium on Intelligent Signal Processing

作者： G.N. Beligiannis L.V. Skarlas S.D. Likothanassis K. Perdikouri University of Patras Artificial Intelligence Research Center (U.P.A.I.R.C.) University of Patras Patras Greece Computer Technology Institute Patras Greece Department of Computer Engineering and Informatics University of Patras Patras Greece University of Patras Patras GR Dept. of Comput. Eng. & Informatics Patras Univ. Greece

In this contribution, a genetic programming based technique, which combines the ability of genetic programming to explore both automatically and effectively, the whole set of candidate model structures and the robustness of evolutionary multimodel partitioning filters, is presented. The method is applied to the nonlinear system identification problem of complex biomedical data. Simulation results show that the algorithm identifies the true model and the true values of the unknown parameters for each different model structure, thus assisting the genetic programming technique to converge more quickly to the (near) optimal model structure. The method has all the known advantages of the evolutionary multimodel partitioning filters, that is, it is not restricted to the Gaussian case, it is applicable to online/adaptive operation and is computationally efficient. Furthermore, it can be realized in a parallel processing fashion, a fact, which makes it amenable to VLSI implementation.

关键词： Bioinformatics Genetic programming Autoregressive processes Signal processing algorithms Nonlinear systems Mathematical model Biomedical signal processing Nonlinear dynamical systems Biomedical computing Biomedical engineering

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Array-rewriting P systems

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Natural Computing 2003年第3期2卷 229-249页

作者： Ceterchi, Rodica Mutyam, Madhu Pǎun, Gheorghe Subramanian, K.G. Research Group on Math. Linguistics Rovira i Virgili University 43005 Tarragona Pl. Imperial Tárraco 1 Spain Fac. of Mathematics/Computer Science University of Bucharest 70109 Bucureşti Str. Academiei 14 Romania Dept. of Computer Sci./Engineering Indian Institute of Technology Madras Chennai 600036 India Institute of Mathematics Romanian Academy 70700 Bucureşti P.O. Box 1-764 Romania Department of Mathematics Madras Christian College Tambaram Chennai 600059 India

We consider array languages (sets of pictures consisting of symbols placed in the lattice points of the 2D grid) and the possibility to handle them with P systems. After proving binary normal forms for array matrix grammars (which, even in the case when no appearance checking is used, are known to generate the array languages of arbitrary array grammars), we prove that the P systems with context-free rules (with three membranes and no control on the communication or the use of rules) are computationally universal, able to generate all computable array languages. Some open problems are also formulated. © 2003 Kluwer academic Publishers.

关键词： Array languages Matrix grammar Membrane computing P system Turing computability

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