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Abstraction and counterexample-guided refinement in model checking of hybrid systems

International Journal of Foundations of computer Science 2003年第4期14卷 583-604页

作者： Clarke, Edmund Fehnker, Ansgar Han, Zhi Krogh, Bruce Ouaknine, Joël Stursberg, Olaf Theobald, Michael Computer Science Department Carnegie Mellon University Pittsburgh PA 15213 United States Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA 15213 United States Process Control Lab (CT-AST) University of Dortmund 44221 Dortmund Germany

Hybrid dynamic systems include both continuous and discrete state variables. Properties of hybrid systems, which have an infinite state space, can often be verified using ordinary model checking together with a finite-state abstraction. Model checking can be inconclusive, however, in which case the abstraction must be refined. This paper presents a new procedure to perform this refinement operation for abstractions of hybrid systems. Following an approach originally developed for finite-state systems [11, 25], the refinement procedure constructs a new abstraction that eliminates a counterexample generated by the model checker. For hybrid systems, analysis of the counterexample requires the computation of sets of reachable states in the continuous state space. We show how such reachability computations with varying degrees of complexity can be used to refine hybrid system abstractions efficiently. Examples illustrate our counterexample-guided refinement procedure. Experimental results for a prototype implementation indicate significant advantages over existing methods. © 2003 World Scientific Publishing Company.

关键词： Abstraction hybrid systems infinite-state systems model checking refinement verification

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The MAMI Query-By-Voice Experiment: Collecting and annotating vocal queries for music information retrieval 4

The MAMI Query-By-Voice Experiment: Collecting and annotatin...

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4th International Symposium on Music Information Retrieval, ISMIR 2003

作者： Lesaffre, Micheline Tanghe, Koen Martens, Gaëtan Moelants, Dirk Leman, Marc De Baets, Bernard De Meyer, Hans Martens, Jean-Pierre IPEM Department of Musicology Ghent University Blandijnberg 2 Ghent9000 Belgium Department of Applied Mathematics and Computer Science Ghent University Belgium Department of Applied mathematics Biometrics and Process Control Ghent University Belgium Ghent University Belgium

The MIR research community requires coordinated strategies in dealing with databases for system development and experimentation. Manually annotated files can accelerate the development of accurate analysis tools for music information retrieval. This paper presents background information on an annotated database of vocal queries that is freely available on the Internet. First we outline the design and set up of the experiment through which the vocal queries were generated. Then attention is drawn to the manual annotation of the vocal queries. © 2003 Johns Hopkins University.

关键词： Structured Query Language

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Optimization of block-floating-point realizations for digital controllers with finite-word-length considerations

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2003年第6期4卷 30-36页

作者：吴俊胡协和陈生褚健 Department of Electronics and Computer Science Zhejiang University Southampton SO17 1BJ National Key Laboratory of Industrial Control Technology National Key Laboratory of Industrial Control Technology Institute of Advanced Process Control China Hangzhou 310027 UK University of Southampton

The closed loop stability issue of finite precision realizations was investigated for digital controllers implemented in block floating point format. The controller coefficient perturbation was analyzed resulting from using finite word length (FWL) block floating point representation scheme. A block floating point FWL closed loop stability measure was derived which considers both the dynamic range and precision. To facilitate the design of optimal finite precision controller realizations, a computationally tractable block floating point FWL closed loop stability measure was then introduced and the method of computing the value of this measure for a given controller realization was developed. The optimal controller realization is defined as the solution that maximizes the corresponding measure, and a numerical optimization approach was adopted to solve the resulting optimal realization problem. A numerical example was used to illustrate the design procedure and to compare the optimal controller realization with the initial realization.

关键词： Digital controller Finite word length Block floating point Closed loop stability Optimization

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Nonlinear observer design for robot manipulators. A survey

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IFAC Proceedings Volumes 2003年第17期36卷 229-234页

作者： A. Abdessameud M.F. Khelfi Laboratoire d'Automatique Appliquée Process Control Univ. of Boumerdes Algeria Computer Science Department - Sciences Faculty Univ. of Oran Es-Sénia Algeria

This paper deals with the nonlinear observation theory as it is applied to the class of rigid robot manipulator systems. A survey based on results and design approaches of non linear observers for this class of nonlinear systems is presented. We cannot make an analytic comparative study of the proposed methods since they are conceptually different. However, we try to provide the reader insight into the performance of each method based on experimental results found in literature, and through simulation analysis on a 2-DOF-robot.

关键词： Nonlinear Observers Rigid Robots High-gain observers Passivity approach Exponential Reduced-order observer

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Model-based coherent-structure control of turbulent shear flows using low-dimensional vortex models

Model-based coherent-structure control of turbulent shear fl...

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33rd AIAA Fluid Dynamics Conference and Exhibit 2003

作者： Pastoor, Mark King, Rudibert Noack, Bernd R. Dillmann, Andreas Tadmor, Gilead Measurement and Control Group Institute for Process and Plant Technology Technical University of Berlin P2-1 Hardenbergstraße 36a D-10623 Berlin Germany Hermann-Fottinger-lnstitute of Fluid Mechanics Technical University of Berlin HF1 Straße des 17. Juni 135 D-10623 Berlin Germany Department of Electrical and Computer Engineering Northeastern University 440 Dana Research Building Boston MA 02115 United States

ISBN: (纸本)9781624100956

In this study, a flow control strategy is presented for manipulating coherent shear-flow structures. As a benchmark problem, the transitional flow around a backward-facing step with local acoustic actuation at the upper edge is chosen. The strategy is based on a hierarchy of low-dimensional vortex models and targets the use of control-theory methods for control design. The hierarchy ranges from an one-vortex model which describes the vortex roll-up and shedding to a vortex-blob model which resolves the formation of Kelvin-Helmholtz vortices and the dynamics of the recirculation zone with a few hundred vortices. The higher-dimensional variants predict well the frequency-dependent reduction of the recirculation zone with harmonic actuation. The Lagrangian vortex models incorporate a continuous production. © 2003 by M. Pastoor, R. King, B.R. Noack A. Dillmann, and G. Tadmor. Published by the Ameri can Institute of Aeronautics and Astronautics, Inc.

关键词： Vortex flow

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Model-based control of vortex shedding using low-dimensional galerkin models

Model-based control of vortex shedding using low-dimensional...

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33rd AIAA Fluid Dynamics Conference and Exhibit 2003

作者： Gerhard, Johannes Pastoor, Mark King, Rudibert Noack, Bernd R. Dillmann, Andreas Morzyński, Marek Tadmor, Gilead Measurement and Control Group Institute for Process and Plant Technology Technical University of Berlin P2-1 Hardenbergstraße 36a D-10623 Berlin Germany Hermann-Föttinger-lnstitute of Fluid Mechanics Technical University of Berlin HF1 Straße des 17. Juni 135 D-10623 Berlin Germany Institute of Combustion Engines and Basics of Machine Design Poznań University of Technology ul. Piotrowo 3 PL 60-965 Poznań Poland Department of Electrical and Computer Engineering Northeastern University 440 Dana Research Building Boston MA 02115 United States

ISBN: (纸本)9781624100956

A model-based flow control strategy is proposed for the suppression of vortex shedding behind a circular cylinder. The control design is based on a hierarchy of low-dimensional Galerkin models of the cylinder wake. These models are constructed from a Karhunen-Loève decomposition of a simulation without actuation. The key enablers are an additional physical mode in the Karhunen-Loève approximation and an energy-based control which respects the regime of model validity. The developed control strategy is successfully tested in direct numerical simulations. © 2003 by J. Gerhard, M. Pastoor, R. King, B.R. Noack, A. Dillmann, M. Morzyński and G. Tadmor. Published by the American Institute of Aeronautics and Astronautics, Inc.

关键词： Circular cylinders

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An Auditory Model Based Transcriber of Singing Sequences 3

An Auditory Model Based Transcriber of Singing Sequences

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3rd International Symposium on Music Information Retrieval, ISMIR 2002

作者： Clarisse, L.P. Martens, J.P. Lesaffre, M. De Baets, B. De Meyer, H. Leman, M. Ghent University Sint-Pietersnieuwstraat 41 Gent9000 Belgium Ghent University Belgium Department of Applied Mathematics Biometrics and Process Control Ghent University Belgium Department of Applied Mathematics and Computer Science Ghent University Belgium

In this paper, a new system for the automatic transcription of singing sequences into a sequence of pitch and duration pairs is presented. Although such a system may have a wider range of applications, it was mainly developed to become the acoustic module of a queryby-humming (QBH) system for retrieving pieces of music from a digitized musical library. The first part of the paper is devoted to the systematic evaluation of a variety of state-of-the art transcription systems. The main result of this evaluation is that there is clearly a need for more accurate systems. Especially the segmentation was experienced as being too error prone (≈ 20 % segmentation errors). In the second part of the paper, a new auditory model based transcription system is proposed and evaluated. The results of that evaluation are very promising. egmentation errors vary between 0 and 7 %, dependent on the amount of lyrics that is used by the singer. The paper ends with the description of an experimental study that was issued to demonstrate that the accuracy of the newly proposed transcription system is not very sensitive to the choice of the free parameters, at least as long as they remain in the vicinity of the values one could forecast on the basis of their meaning. © 2002 IRCAM - Centre Pompidou.

关键词： Systematic errors

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T-transitive closures, openings and approximations of similarity relations

T-transitive closures, openings and approximations of simila...

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： B. De Baets H. De Meyer Department of Applied Mathematics Biometrics and Process Control Ghent University Gent Belgium Department of Applied Mathematics and Computer Science Ghent University Gent Belgium

Given a t-norm T belonging to the class of copulas, we propose three algorithms operating on a similarity relation R on a finite universe: an algorithm for computing the T-transitive closure of R, an algorithm that nearly always generates a T-transitive opening of R, and an algorithm for approximating R by a T-transitive similarity relation or T-equivalence that is 'close' to it. The latter method consists of a cascade of T'-closure and T'-opening operations, where the t-norm T' gradually progresses to T.

关键词： Mathematics Biometrics process control computer science AC generators Symmetric matrices

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Transitivity of comparison measures

Transitivity of comparison measures

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： S. Janssens B. De Baets H. De Meyer Department of Applied Mathematics Biometrics and Process Control Ghent University Ghent Belgium Department of Applied Mathematics and Computer Science Ghent University Ghent Belgium

A family of fuzzification schemes is proposed for transforming cardinality-based similarity and inclusion measures for ordinary sets into similarity and inclusion measures for fuzzy sets in a finite universe. The family is based on rules for fuzzy set cardinality and for the standard operations on fuzzy sets. In particular, the fuzzy set intersections are pointwisely generated by Frank t-norms. The fuzzification schemes are applied to a variety of previously studied rational cardinality-based similarity and inclusion measures for ordinary sets and it is demonstrated that transitivity is preserved in the fuzzification process. Finally, we introduce a new parametrized family of similarity measures and a new parametrized family of inclusion measures and investigate the transitivity properties of both families and their fuzzification.

关键词： Fuzzy sets Mathematics Length measurement Information retrieval Biometrics process control computer science Statistics Data mining Psychology

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Colored Petri net control of OR-logic

Colored Petri net control of OR-logic

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IEEE International Symposium on Intelligent control (ISIC)

作者： Weimin Wu Hongye Su Jian Chu W.M. Wonham National Laboratory of Industrial Control Technology & Institute of Advanced Process Control University of Zhejiang Hangzhou China Department of Electrical and Computer Engineering University of Toronto Toronto ONT Canada

Usually, the maximally permissive control of Petri nets with an OR-logic constraint is difficult to implement. In this paper, OR-logic is easily enforced using a colored Petri net. A colored Petri net place, named colored monitor place, is designed to monitor the states of constraints. A so-called guard function of colored Petri nets that maps certain transitions into a Boolean expression is suitably defined on the colored sets. The maximally permissive control is then obtained via the guard function. In addition, a constraint transformation method for marked graphs with uncontrollable transitions is proposed.

关键词： Petri nets Vectors control systems Laboratories Industrial control process control computerized monitoring Logic Glass Force control

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