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Power Tech Conference

作者： G. Bajracharya T. Koltunowicz R. R. Negenborn Z. Papp D. Djairam B. De Schutter J. J. Smit Faculty of Electrical Engineering Mathematics and Computer Science Department High-voltage Components and Power Systems Delft University of Technnology Delft Netherlands Delft Center of Systems and Control Delft University of Technnology Delft Netherlands TNO Science and Industry Delft Netherlands Faculty of Electrical Engineering Mathematics and Computer Science Department High-voltage Components and Power Systems Transport Technology Department Delft University of Technnology Delft Netherlands

In this paper, a model-predictive control based framework is proposed for modeling and optimization of the health state of power system equipment. In the framework, a predictive health model is proposed that predicts the health state of the equipment based on its usage and maintenance actions. Based on the health state, the failure rate of the equipment can be estimated. We propose to use this predictive health model to predict the effects of different maintenance actions. The effects of maintenance actions over a future time window are evaluated by a cost function. The maintenance actions are optimized using this cost function. The proposed framework is applied in the optimization of the loading of transformers based on the thermal degradation of the paper insulation.

关键词： Power system modeling Predictive models Aging Cost function Marine technology Power transformer insulation Predictive maintenance Power system management Investments Power system reliability

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Stability of a class of 2D linear systems with smoothing

Stability of a class of 2D linear systems with smoothing

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Blazej Cichy Krzysztof Galkowski Eric Rogers Anton Kummert Institute of Control and Computation Engineering University of Zielona Góra Gora Poland School of Electronics and Computer Science University of Southampton Southampton UK Faculty of Electrical Information and Media Engineering Communication Theory University of Wuppertal Wuppertal Germany

ISBN: (纸本)9781424427994

Repetitive processes are a distinct class of two-dimensional (2D) systems (i.e. information propagation in two independent directions occurs) of both systems theoretic and applications interest. They cannot be controlled by direct extension of existing techniques from either standard (termed 1D here) or (often) 2D systems theory. In this paper we begin the development a systems theory for a model of these processes necessary to represent terms which arise in some applications areas but are not included in the currently used models.

关键词： Stability Linear systems Smoothing methods control systems Iterative algorithms Communication system control Optimal control Signal processing algorithms control engineering computing RNA

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Preemptive Single Processor Scheduling with Distinct Due Windows and Minimization of Maximum Earliness and Tardiness

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IFAC Proceedings Volumes 2009年第13期42卷 228-233页

作者： A. Janiak W.A. Janiak R. Januszkiewicz Institute of Computer Engineering Control and Robotics Wroclaw University of Technology Janiszewskiego 11/17 50-372 Wroclaw Poland tel.: +48-71-320-2107 fax.:+48-71-321-2677 Faculty of Computer Science and Management Wroclaw University of Technology Lukasiewicza 5 50-371 Wroclaw Poland

Abstract Problem of scheduling n preemptive jobs on a single processor is studied, in which for each job a distinct due window is given in advance. If a job is completed within its due window, then it incurs no penalty. Otherwise, it incurs a job-independent earliness or tardiness cost. The objective is to find a job schedule such that a maximum of weighted costs associated with earliness and tardiness is minimized. Properties of optimal solutions of this problem are established and an algorithm based on them is presented. It is proved that the analysed problem is solvable in O ( n 2 ) time.

关键词： scheduling algorithms preemption earliness-tardiness due windows

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A weighted patient specific electromechanical model of the heart

A weighted patient specific electromechanical model of the h...

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International Symposium on Applied Computational Intelligence and Informatics ( SACI)

作者： Sandor M. Szilagyi Laszlo Szilagyi David Iclanzan Zoltan Benyo Faculty of Technical and Human Sciences Sapientia Hungarian Science University of Targu Mures Romania Faculty of Technical and Human Sciences Sapientia Hungarian Science University of Târgu Mureş Romania Faculty of Computer Science Babes Bolyai University Romania Department of Control Engineering and Information Technology Budapest University슠of슠Technology슠and슠Economics Budapest Hungary

This paper presents a patient specific deformable heart model that involves the known electric and mechanic properties of the cardiac cells and tissue. The accuracy and efficiency of the algorithm was tested for anisotropic and inhomogeneous 3D domains using ten Tusscher's and Nygen's cardiac cell models. During propagation of depolarization wave, the kinetic, compositional and rotational anisotropy is included in the tissue, organ and torso model. The applied patient specific parameters were determined by an evolutionary computation method. An intensive parameter reduction was performed using the abstract formulation of the searching space. This patient specific parameter representation enables the adjustment of deformable model parameters in real-time. The validation process was performed using measured ECG and ultrasound image records that were compared with simulated signals and shapes using an abstract, parameterized evaluation criterion.

关键词： Heart Deformable models Anisotropic magnetoresistance Shape measurement Mechanical factors Testing Kinetic theory Torso Evolutionary computation Performance evaluation

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Optimization based synthesis of state derivative feedback controllers for retarded systems

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IFAC Proceedings Volumes 2009年第14期42卷 162-167页

作者： Paul McGahan Tomás Vyhlídal Wim Michiels Center for Applied Cybernetics Dept. of Instrumentation and Control Eng. Faculty of Mechanical Engineering Czech Technical University in Prague Technická 4 166 07 Praha 6 Czech Republic Department of Computer Science Katholieke Universiteit Leuven Celestijnenlaan 200A B-3001 Heverlee Belgium

The paper presents an optimization based algorithm for stabilizing retarded systems using a state derivative feedback controller. It is shown that an application of such a controller results in neutral dynamics of the closed loop system if small feedback delays occur. Therefore, the strong stability theory of neutral systems needs to be considered in the controller synthesis problem. The stabilization approach is based on minimizing the spectral abscissa of the closed loop system over the controller parameter space, subject to a strong stability constraint.

关键词： Time Delay State Derivative Feedback Strong Stability Delay Structure

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Quasi-direct pole placement for time delay systems applied to a heat transfer set-up

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IFAC Proceedings Volumes 2009年第14期42卷 325-330页

作者： Tomáš Vyhlídal Wim Michiels Pavel Zítek Center for Applied Cybernetics Dept. of Instrumentation and Control Eng. Faculty of Mechanical Engineering Czech Technical University in Prague Technicka 4 166 07 Praha 6 Czech Republic Department of Computer Science Katholieke Universiteit Leuven Celestijnenlaan 200A B-3001 Heverlee Belgium

A method for quasi-direct pole placement is presented for a class of retarded time delay systems with a single control input. The pole placement is done in two steps. First, a number of dominant poles, smaller than the number of controller parameters, are directly assigned. This leads to constraints on the controller parameters. By using the singular value decomposition a simple parameterization of all controllers satisfying these constraints is obtained. In the second step, the remaining degrees of freedom in the parameter space are used to shift the remaining part of the system spectrum as far to the left as possible. It is done using an optimization procedure for nonsmooth, nonconvex functions. An extensive real-plant example is presented to demonstrate the application of the novel pole placement procedure.

关键词： Retarded system pole placement singular value decomposition nonsmooth optimization

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Attenuation of ultrasound pressure fields described via contrast source formulation

Attenuation of ultrasound pressure fields described via cont...

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IEEE Symposium (IUS) Ultrasonics

作者： L. Demi M.D. Verweij J. Huijssen N. de Jong K.W.A. van Dongen Laboratory of Acoustical Imaging and Sound Control Faculty of Applied Sciences Delft University of Technnology Netherlands Laboratory of Electromagnetic Research Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technnology Netherlands Laboratory of Experimental Echocardiography Erasmus MC-University Medical Center Rotterdam Rotterdam Netherlands

Experimental data reveal that attenuation is an important phenomenon in medical ultrasound. The phenomenon is of particular importance for applications based on nonlinear propagation, as the higher frequency components of the pressure field generally experience greater attenuation. Therefore a method that is capable of modeling attenuation accurately is essential. In this paper we present a method to model attenuation via a contrast source formulation. We compare the obtained results with a version of the INCS method in which the attenuation is included in the Green's function. Both results are in excellent agreement with each other.

关键词： Attenuation Ultrasonic imaging Nonlinear acoustics Laplace equations Nonlinear equations Laboratories Biomedical imaging Acoustic propagation Acoustic waves Biomedical acoustics

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∞ model reduction for linear parameter-varying systems with distributed delay

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International Journal of control 2009年第3期82卷 408-422页

作者： Ligang Wu Peng Shi Huijun Gao & Junling Wang Space Control and Inertial Technology Research Center Harbin Institute of Technology Harbin 150001 P. R. China Faculty of Advanced Technology University of Glamorgan Pontypridd CF3 1DL UK Department of Electrical and Computer Engineering University of Alberta Edmonton Alberta Canada College of Nuclear Science and Technology Harbin Engineering University Nantong Street 145 Harbin 150001 China

This paper is concerned with the ∞ model reduction for linear parameter-varying (LPV) systems with both discrete and distributed delays. For a given stable system, our attention is focused on the construction of reduced-order models, which approximate the original system well in an ∞ norm sense. First, a sufficient condition is proposed for the asymptotic stability with an ∞ performance of the error system by using the parameter-dependent Lyapunov functional method. Then, the decoupling technique is applied, such that there does not exist any product term between the Lyapunov matrices and the system matrices in the parametrised linear matrix inequality (PLMI) constraints; thus a new sufficient condition is obtained. Based on the new condition, two different approaches are developed to solve the model reduction problem. One is the convex linearisation approach and the other is the projection approach. Finally, a numerical example is provided to demonstrate the effectiveness of the proposed design method

关键词： Distributed delay model reduction parameterised linear matrix inequality (PLMI) linear parameter-varying (LPV) systems

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control of Discrete Linear Repetitive Processes with Non-causal Dynamics

Control of Discrete Linear Repetitive Processes with Non-cau...

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第二十七届中国控制会议

作者： Cichy B. Galkowski K. Rogers E. Kummert A. Institute of Control and Computation Engineering University of Zielona Gora School of Electronics and Computer Science University of Southampton Faculty of Electrical Information and Media EngineeringUniversity of Wuppertal

ISBN: (纸本)9787900719706

Repetitive processes propagate information propagation in two independent directions and are of both systems theoretic and applications *** cannot be controlled by direct extension of existing techniques from either standard(termed 1D here) or(often) 2D systems *** this paper we propose,motivated by critical features in the dynamics of some examples a model which has non-causal elements and then develop new results on the stability and control of examples which it represents.

关键词： Stability analysis,Rubust control,LMI

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Xml data integration in SixP2P - a theoretical framework 08

Xml data integration in SixP2P - a theoretical framework

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DaMaP 2008: International Workshop on Data Management in Peer-to-peer Systems, held in conjunction with the 11th International Conference on Extending Database Technology, EDBT 08

作者： Pankowski, Tadeusz Institute of Control and Information Engineering Poznan University of Technology Poland Faculty of Mathematics and Computer Science Adam Mickiewicz University Poznan Poland

ISBN: (纸本)9781595939678

In the paper we discuss the problem of data integration in a P2P environment. In such setting each peer stores schema of its local data, mappings between the schema and schemas of some other peers (peer's partners), and schema constraints. The goal of the integration is to answer queries formulated against arbitrarily chosen peers. The answer consists of data stored in the queried peer as well as data of its direct and indirect partners. We focus on defining and using mappings, schema constraints, query propagation across the P2P system, and query reformulation in such scenario. A special attention is paid to discovering missing values using schema constraints and to reconcile inconsistent data using reliability levels assigning to the sources of data. The discussed approach has been implemented in SixP2P system (Semantic Integration of XAIL data in P2P environment). © Copyright 2008 ACM.

关键词： Data integration

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