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International Conference on Mixed Design of Integrated Circuits and Systems (MIXDES)

作者： P. Zarychta Institute of Electronics Faculty of Autmatic Control Electronics and Computer Science Silesian University of Technology Gliwice Poland

This article shows a new method of the automatic registration of T1- and T2-weighted MR knee images. This method is based on the entropy and energy measures of fuzziness and can be used in localization process of cruciate ligament. First, two sequences (T1- and T2-weighted) are converted to a fuzzy representation. Then, the entropy and energy measures are employed in the NCC (normalized cross correlation) and GD (gradient difference) methods. The alignment based on energy and entropy fuzzy measures shows a significant improvement in comparison with the implementation of the original image

关键词： Biomedical imaging Knee Energy measurement Entropy Sea measurements Image registration Ligaments Humans Pixel Medical diagnostic imaging

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The Role of the 2D Lyapunov Equation in Stability and control Law Design for Discrete Linear Repetitive Processes

The Role of the 2D Lyapunov Equation in Stability and Contro...

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IEEE Conference on Decision and control

作者： E. Rogers D. H. Owens School of Electronics and Computer Science University of Southampton UK Department of Automatic Control and Systems Engineering University of Sheffield Sheffield UK

ISBN: (纸本)1424401704

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 ID here) or (most often) 2D systems theory. In this paper, we continue the development of an applications oriented systems theory for the sub-class of so-called discrete linear repetitive processes which arise in both systems theoretic and applications studies. The new results relate to the use of a so-called 2D Lyapunov equation in both stability analysis and control law design

关键词： Equations control systems Iterative algorithms Optimal control Asymptotic stability USA Councils Stability analysis Power system reliability Terminology automatic control

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H/sub /spl infin// control of differential linear repetitive processes

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IEEE Transactions on Circuits and Systems II: Express Briefs 2006年第1期53卷 39-44页

作者： W. Paszke K. Galkowski E. Rogers D.H. Owens Institute of Control and Computation Engineering University of Zielona Góra Zielona Gora Poland School of Electronics and Computer Science University of Southampton UK Department of Automatic Control and Systems Engineering University of Sheffield Sheffield UK

Repetitive processes are a distinct class of two-dimensional (2-D) systems (i.e., information propagation in two independent directions) of both systems theoretic and applications interest. They cannot be controlled by direct extension of existing techniques from either standard [termed one-dimensional (1-D) here] or 2-D systems theory. Here, we give new results on the relatively open problem of the design of control laws using an H infin setting. These results are for the sub-class of so-called differential linear repetitive processes which arise in applications

关键词： Symmetric matrices Linear matrix inequalities Vectors Stability Boundary conditions automatic control control engineering computing computer science Systems engineering and theory Robustness

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About the Utility of the Extremum control Systems for Induction Traction Motors

About the Utility of the Extremum Control Systems for Induct...

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IEEE International Conference on Automation, Quality and Testing, Robotics, AQTR

作者： Rodica Festila Vasile Tulbure Clement Festila Department of Automatic Control Faculty of Automation and Computer Science Technical University of Cluj Napoca Cluj-Napoca Romania Romanian Railways Romania

The extremum control of the high power induction traction motor is justified by the possibility to operate with minimum electrical power/energy, especially by partial load. The extremum control system is usually overlapped to the speed (or torque) control system and is valid if a steady state, partial load of the operation is established. The authors analyze the problem of various modes of operation under reduced disturbances. Also, the analysis deals with the problem of the limits of the stable behavior of the extremum control system

关键词： control systems Traction motors Induction motors Torque control Inverters Stators Equations automatic control Steady-state Frequency

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Using data mining techniques for the management of seismic vulnerability

Using data mining techniques for the management of seismic v...

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作者： Leon, Florin Atanasiu, Gabriela M. Gâlea, Dan Gh. Asachi Technical University of Iaşi Romania Faculty of Automatic Control and Computer Science 53A Dimitrie Mangeron Blvd. Iaşi 700050 Romania Gh. Asachi Technical University of Iaşi Romania Faculty of Civil Engineering 43 Dimitrie Mangeron Blvd. Iaşi 700050 Romania

Natural hazards, and especially earthquakes, are often recurring phenomena. Therefore, there is a permanent need for solutions to reduce earthquake losses by developing technologies, procedures, knowledge, and tools for seismic design and rehabilitation of buildings and infrastructure. A key point to an effective decision making process that aims at mitigating their effects is building a model of the underlying facts. A Geographical Information System (GIS) is a framework able to assemble, keep, process and display specific information, identified by geographical location, which can combine layers of information to give the user a better understanding about that location. By using a Geographical Information System containing geospatial data, one can develop useful scenarios to reduce natural disaster risk and vulnerability of structures. In this paper, we describe a way of applying data mining techniques from the artificial intelligence field to earthquake analysis in order to make a better investigation of the available data. These methods are capable of finding "hidden" correlations among different subsets of data, which cannot be revealed by means of simple statistics.

关键词： Data mining

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INFLUENCE OF SCALING AND UNFOLDING IN PCA BASED MONITORING OF NUTRIENT REMOVING BATCH PROCESS

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IFAC Proceedings Volumes 2006年第13期39卷 114-119页

作者： Magda Ruiz Kris Villez Gurkan Sin Joan Colomer Peter Vanrrolleghem 1Control Engineering and Intelligent Systems Group –eXiT Department of Electronics Computer Science and Automatic Control University of Girona Campus Montilivi CP 17071 Building PIV Girona - Spain Department of Applied Mathematics Biometrics and Process Control Ghent University Coupure Links 653 B-9000 Ghent – Belgium

The data set of batch biological and biotechnological processes can be organized in a three-way data matrix. In this paper the usefulness of different PCA approaches for monitoring is analyzed. Different ways of unfolding and scaling of data have been applied to a pilot-scale SBR data. PCA is used to reduce the dimensionality and to remove the non-linearity dynamic of the data. Moreover, a new method to select the number of principal components is proposed. Loadings graphics are used to determinate the predominant variables for each one. The results show that whatever model can be applied depending on the goal of the monitoring, however the models implicate possible false alarms or faults omission.

关键词： Biological Process Process monitoring Multiway Principal Component Analysis (MPCA)

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Output feedback/feedforward control of discrete linear repetitive processes for performance and disturbance rejection

Output feedback/feedforward control of discrete linear repet...

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American control Conference (ACC)

作者： B. Sulikowski K. Galkowski E. Rogers D.H. Owens A. Kummert Institute of Control and Computation Engineering University of Zielona Gora Zielona Gora Poland School of Electronics and Computer Science University of Southampton Southampton UK Department of Automatic Control and Systems Engineering University of Sheffield Sheffield UK Faculty of Electrical Information and Media Engineering University of Wuppertal Wuppertal Germany

Repetitive processes propagate information in two independent directions and are of both systems theoretic and applications interest. They cannot be controlled by direct extension of existing techniques from either standard (termed ID here) or 2D systems theory. Here we give new results on the design of physically based feedforward/feedback control laws to achieve desired performance and disturbance decoupling in the sense defined in the body of the paper. The new results are for the case when only output (as opposed to state) information is used to activate the control law

关键词： Output feedback Linear feedback control systems control systems Optimal control Process control Linear systems Stability Feedback control Algorithm design and analysis Iterative algorithms

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Implementation of Industrial Robot Force control Case Study: High Power Stub Grinding and Deburring

Implementation of Industrial Robot Force Control Case Study:...

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2006 IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： A. Robertsson T. Olsson R. Johansson A. Blomdell K. Nilsson M. Haage B. Lauwers H. De Baerdemaeker T. Brogardh H. Brantmark Department of Automatic Control Lund University Hospital Lund Sweden Dept. of Automatic Control Lund University Sweden Dept. of Computer Science Lund University Sweden Department of Computer Science Lund University Hospital Lund Sweden Dept. of Mechanical Engineering Faculty of Engineering Heverlee Belgium Department of Mechanical Engineering Heverlee Belgium ABB Automation Technologies - Robotics Västerås Sweden

In this paper, the results from a joint industry-academia project in industrial robotic force control are presented. The extension and implementation of an external sensor system for an industrial robot system, which can be used for high-bandwidth force control, are described. Results from two industrial applications using the system are presented, a stub grinding application using a new compliant grinding end-effector integrated with the robot control system, and a deburring application with a stiff tool requiring high-bandwidth force control in six degrees of freedom. Using the system an easily reconfigurable control structure was achieved, which was able to control contact forces with a sampling bandwidth of an order of magnitude higher than for conventional robot controllers

关键词： Industrial control Service robots Force control Deburring Electrical equipment industry Robot sensing systems control systems Robot control Sensor systems Sampling methods

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Speech enhancement based on auto gain control

Speech enhancement based on auto gain control

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作者： Nagata, Yoshifumi Fujioka, Toyota Abe, Masato IEEE Department of Computer and Information Science Iwate University Morioka 020-8551 Japan Research and Development Center Toshiba Corporation Iwate University Morioka Japan Acoustical Society of Japan Information Processing Society of Japan Department of Computer and Information Science Faculty of Engineering Iwate University Acoustical Society of America Institute of Noise Control Engineering of Japan Institute of Electronics Information and Communication Engineers Association for Computing Machinery Japan Society of Mechanical Engineers

We propose a new method of speech enhancement based on auto gain control (AGC) using two channel inputs to deal with transient noises. Auto gain control is considered to be relatively ineffective for reducing noises that are superimposed on speech. Nevertheless, it offers advantages for addressing problems posed by musical noise and spectral distortion. This method combines two operations for obtaining accurate gain. One is spectral subtraction for two-channel input (2chSS);the other is self-offset of the noise with pre-whitening. This study also addresses a coherence based post-filter to reduce uncorrelated noise components among channels. The proposed method is evaluated in experiments across three noise conditions in which (i) impulsive noises, (ii) stationary car noise, and (iii) speech noise are present, respectively. Objective measures and spectrograms demonstrate marked improvements over other two-microphone based methods, but subjective preference tests reveal that the proposed method is less preferred than the equivalent of a nonprocessed signal in the case of stationary car noise (ii). The performance of the proposed method and the conventional 2chSS were even in the case of speech noise (iii). These results of subjective tests reflect some disadvantages of the AGC processing. Those drawbacks involve degradation of noise consistency in stationary noise conditions and residual noises in desired speech segments. Nevertheless, subjective tests in the case of noise (i) demonstrate that the proposed method is the most preferred among the methods compared here. The effectiveness of the proposed method is confirmed particularly for this noise condition. © 2006 IEEE.

关键词： Speech processing

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Time-sliding suboptimal regulation of bilinear interconnected systems

Time-sliding suboptimal regulation of bilinear interconnecte...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： M. de la Sen A.J. Garrido J.C. Soto O. Barambones F.J. Maseda I. Garrido Institute of Research and Development of Processes IIDP. Department of Electricity and Electronics Faculty of Science and Technology University of Basque Country (UPV-EHU) Leioa Spain Department of Systems Engineering and Automatic Control. EUITI de Bilbao University of Basque Country (UPV-EHU) Spain

This paper focuses on the suboptimal regulation of multivariable discrete-time bilinear systems consisting of interconnected bilinear subsystems with respect to a linear quadratic optimal regulation criterion which involves the use of state weighting terms only. Three transformations are used in order to treat the scheme over an equivalent linear system. This leads to the appearance of quadratic weighting terms related to both transformed input and state variables. In this way, a Ricatti matrix-sequence allowing the synthesis of a standard feedback control law is obtained

关键词： Interconnected systems Nonlinear systems controllability automatic control control systems Power system modeling Research and development Systems engineering and theory Optimal control Linear systems

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