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2003 European control Conference, ECC 2003

作者： Procházka, A. Šindelářová, I. Ptáček, J. Prague Institute of Chemical Technology Department of Computing and Control Engineering Technická 1905 Prague 6166 28 Czech Republic University of Economics Department of Econometrics W. Churchill Sq. 4 Prague 3130 67 Czech Republic

ISBN: (纸本)9783952417379

Image de-noising and restoration represent basic problems in image processing with many different applications including engineering, reconstruction of missing data during their transmission and enhancement of biomedicai structures as well. This problem occurs also in filling-in blocks of missing or corrupted data. The paper presents the use of Wavelet transform in this area including its application for image decomposition and rejection of its components at first. The main part of the paper is devoted (i) to algorithms of restoration of missing image blocks by the search of similar structures of a given image in the Wavelet domain space and (ii) to comparison of this approach with iterated Wavelet interpolation and predictive image modelling. Proposed methods are verified for simulated data and then applied for processing of magnetic resonance images. © 2003 EUCA.

关键词： Image denoising

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Image de-noising and restoration using wavelet transform

Image de-noising and restoration using wavelet transform

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European control Conference (ECC)

作者： A. Procházka I. Šindelárová J. Ptáček Department of Computing and Control Engineering Prague Institute of Chemical Technology Prague 6 Czech Republic Department of Econometrics University of Economics Prague 3 Czech Republic

关键词： Decision support systems Convolution Image restoration Discrete wavelet transforms Image reconstruction

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A fuzzy track-keeping autopilot for ship steering

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Proceedings of the Institute of Marine engineering, Science and Technology Part A: Journal of Marine engineering and Technology 2003年第2期 23-29页

作者： Omerdic, E. Roberts, G.N. Vukic, Z. Mechatronics Research Centre University of Wales College Newport United Kingdom University of Zagreb Faculty of Electrical Engineering and Computing Zagreb Croatia Department of Mechatronics United Kingdom IFAC Technical Committee on Marine Systems United Kingdom IFAC Technical Committee on Mechatronic Systems United Kingdom Department of Control Engineering University of Zagreb Faculty of Electrical Engineering and Computing Croatia IEEE Control Systems/Robotics Automation Society Croatia

In this paper a non-linear fuzzy autopilot for ship track-keeping is presented. The proposed autopilot has four inputs (actual and desired heading, rate of change of heading and offset from the desired path) and one output (command rudder angle). The track-keeping problem is decomposed into two subtasks: (i) followthe desired heading, and (ii) bring the ship onto the desired path and keep tracking. Internally, the autopilot consists of two autopilots that fulfil these tasks simultaneously. The proposed control scheme has been verified using a non-linear model of a Mariner-class vessel and steering mechanism under the influence of wave and current disturbances. Results presented show how such a control strategy enables improved tracking performance.

关键词： Ships

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Defects detection in continuous manufacturing by means of convolutional neural networks

Defects detection in continuous manufacturing by means of co...

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7th International Work-Conference on Artificial and Natural Neural Networks, IWANN 2003

作者： Calderón-Martinez, José A. Campoy-Cervera, Pascual Department of Automatic Control Electrical Engineering Industrial Computing Universidad Politecnica de Madrid C/ Jose Gutierrez Abascal 2 Madrid28006 Spain Instituto Tecnologico de Aguascalientes Av. Lopez Mateos 1801 Ote Aguascalientes Ags20256 Mexico

ISBN: (纸本)354040211X

Detecting defects in paper pulp manufacturing process’s using a non-touched, effective, on-line and fast method is critical in the paper industry. This work presents a neural network based system for detecting pitch and shive defects using digital filters generated by a Convolutional Neural Architecture. The main subjects discussed are: generating digital filters automatically, filters optimal size for this application, and detecting and identifying defects. The experimental results exhibit how simple and powerful is the architecture designed for generating filters to detect different defect types. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Defects

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Optimization of PM brushless DC motor drive

Optimization of PM brushless DC motor drive

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IEEE International Conference on Industrial Technology (ICIT)

作者： P. Crnosija T. Bjazic R. Krishnan Faculty of Electrical Engineering and Computing Department of Control and Comp. Eng. in Automation University of Zagreb Zagreb Croatia The Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute and State University Blacksburg VA USA

Traditional approaches to controller designs that guarantee fast compensation of load torque and reference variations result in design iterations and most of the time in poorer response for load torque variations. In this paper a reference model for desired drive behavior generation and optimization methods has been applied to achieve controller integral time constant lower than the maximum time constant of the PM brushless DC motor drive. Presented simulation results show that using reference model for desired drive behavior generation, it is possible to determine optimal controller parameters for faster (10 time) and better (2 time) load torque compensation than in the case of traditional design of speed controller parameters. Response due to reference input with constrained overshoot has been achieved using a filter in the servosystem input. Thereby, the proposed method demonstrates the design of a speed controller that is optimal for both load torque and reference variations and its verification with simulation are accomplished for a permanent magnet brushless dc motor drive.

关键词： Brushless DC motors Torque control Optimal control Time factors DC generators Optimization methods Magnetic separation Filters Servosystems Design methodology

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A study on integral equalities related to a Laplace transformable function and its applications

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International Journal of control, Automation and Systems 2003年第1期1卷 76-82页

作者： Kwon, Byung-Moon Ryu, Hee-Seob Kwon, Oh-Kyu Guidance and Control Department Korea Aero Space Research Institute Korea Republic of Ubiquitous Computing Lab. Samsung Adv. Institute of Technology Korea Republic of Sch. of Elec. and Comp. Engineering Inha University Korea Republic of

This paper establishes some integral equalities formulated by zeros located in the convergence region of a Laplace transformable function. Using the definition of the Laplace transform, it shows that Laplace transformable functions have to satisfy the integral equalities in the time-domain, which can be applied to the understanding of the fundamental limitations on the control system represented by the transfer function. In the unity-feedback control scheme, another integral equality is derived on the output response of the system with open-loop poles located in the convergence region of the output function. From these integral equalities, two sufficient conditions related to undershoot and overshoot phenomena in the step response, respectively, are investigated.

关键词： Laplace transforms

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Robust filtering by fictitious noises

Robust filtering by fictitious noises

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IEEE Conference on Decision and control

作者： Huanshui Zhang D. Zhang Wei Wang Lihua Xie Shenzhen Graduate School of Harbin Institute of Technoloy Shenzhen China The Center for Information and Control Dalian University of Technology Dalian China Department of Computing Hong Kong Polytechnic University Hong Kong China BLK S2 School of Electrical and Electronic Engineering Nanyang Technological University Singapore

ISBN: (纸本)0780379241

In this paper, a new approach is presented for robust filtering of a linear discrete-time signal by applying fictitious noise. Modeling errors, in both the numerator and denominator of the transfer functions, are parameterized by using random variables with zero mean and known covariance. The robust performance is obtained by minimizing the mean square estimation error over all of the random parameter and noise. To derive a robust estimator, the uncertainties in the model are incorporated into two mutually uncorrelated fictitious noises with zero means. The covariances of the fictitious noises are computed by using two formulas that are presented in this paper. An illustrative example shows the effectiveness of our approach.

关键词： Noise robustness Uncertainty Polynomials Transfer functions Stochastic resonance Technological innovation Mean square error methods Robust control Information filtering Information filters

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A reinforcement learning approach to obstacle avoidance of mobile robots

A reinforcement learning approach to obstacle avoidance of m...

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International Workshop on Advanced Motion control (AMC)

作者： K. Macek I. Petrovic N. Peric Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering in Automation University of Zagreb Croatia

One of the basic issues in the navigation of autonomous mobile robots is the obstacle avoidance task that is commonly achieved using a reactive control paradigm where a local mapping from perceived states to actions is acquired. A control strategy with learning capabilities in an unknown environment can be obtained using reinforcement learning where the learning agent is given only sparse reward information. This credit assignment problem includes both temporal and structural aspects. While the temporal credit assignment problem is solved using core elements of the reinforcement learning agent, solution of the structural credit assignment problem requires an appropriate internal state space representation of the environment. In this paper, a discrete coding of the input space using a neural network structure is presented as opposed to the commonly used continuous internal representation. This enables a faster and more efficient convergence of the reinforcement learning process.

关键词： Learning Mobile robots control engineering computing Automatic control Neural networks Fuzzy logic Path planning Robotics and automation Navigation State-space methods

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ATM available bit rate congestion control with on-line network model identification

ATM available bit rate congestion control with on-line netwo...

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IEEE International Conference on Electronics, Circuits and Systems (ICECS)

作者： D. Brscic I. Petrovic N. Peric Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering in Automation University of Zagreb Zagreb Croatia

In this paper, the design of available bit rate (ABR) congestion control in ATM (asynchronous transfer mode) networks is considered. The goals of congestion control are high link utilization, low cell loss, and low network delay. Various algorithms for congestion control can be found in the literature. Most of them are based on a network model, which is assumed to be known. In this paper a recursive least square (RLS) algorithm for on-line identification of the network model is implemented and combined with a generalized predictive controller (GPC) and with an I-controller based on the Smith predictor. Simulations were carried out to prove the effectiveness of the proposed algorithms.

关键词： Bit rate Asynchronous transfer mode Traffic control Automatic control Communication system traffic control control design Bandwidth Switches Process control control engineering computing

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Experimental investigations of the rubber-asphalt sliding pair dynamics

Experimental investigations of the rubber-asphalt sliding pa...

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作者： Božić, Ante Petrović, Ivan Perić, Nedjeljko Matuško, Jadranko Poclain-Hydraulics Industrie Direction Technique B.P.N. 106 60411 Verberie Cedex France University of Zagreb Faculty of Electrical Engineering and Computing Department for Control and Computer Engineering in Automation Unska 3 HR-10000 Zagreb Croatia

ISBN: (纸本)0791836290

A laboratory model for experimental investigations of the rubber-asphalt sliding pair has been designed with the purpose of better understanding of dynamic behavior of the friction force in the contact patch between the car tire and the road. Its design is described and some experimental results are given. These results confirm that it is essential to use a dynamic friction model in order to describe friction force in contact between the car tire and the road. Moreover, they indicate that the existing dynamic friction models might be physically incorrect regarding the change of friction coefficient for an asperity bristle passing through the contact surface. Copyright © 2002 by ASME.

关键词： Tribology

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