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5th IFAC Symposium on Modelling and control in Biomedical Systems 2003

作者： Smolka, Bogdan Plataniotis, Konstantinos N. Venetsanopoulos, Anastasios N. Lukac, Rastislav Department of Automatic Control Silesian University of Technology Akademicka 16 Str. Gliwice44-101 Poland Department of Electrical and Computer Engineering University of Toronto 10 King's College Road Toronto Canada Slovak Image Processing Center Jarkova 343 Dobsina049 25 Slovakia

The single cell gel electrophoresis, called Comet Assay is a microelectrophoretic technique of direct visualization of DNA damage at the cell level. In the comet assay, the cells suspended in an agarose gel on a microscope slide are subjected to lysis, unwinding of DNA and electrophoresis. After staining with fluorescent DNA binding dye, cells with DNA damage display increased migration of genetic material from the cell nucleus. Under the influence of weak, static electric field, charged DNA migrates away from the nucleus forming a so called comet. The damage is quantified by measuring the amount of the genetic material, which migrates from the nucleus to form the comet tail. The foremost advantage of the comet assay is that it analyses individual cells, thus allowing the measurement of the heterogeneity of response within a cell population. In this paper we present three novel methods of the comet tail and head extraction. Copyright © 2003 IF A C.

关键词： Image enhancement

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Document clustering using hierarchical SOMART neural network

Document clustering using hierarchical SOMART neural network

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International Joint Conference on Neural Networks (IJCNN)

作者： M.F. Hussin M. Kamel Department of Computer Science & Automatic Control Alexandria University Alexandria Egypt Department of Systems Design Engineering University of Waterloo Waterloo ONT Canada

Availability of large full-text document collections in electronic form has created a need for tools and techniques that assist users in organizing these collections. Document clustering is one of the popular methods used for this purpose. In this paper, we propose the neural network based document clustering method by using a hierarchically organized network built up from independent Self-Organizing Map (SOM) and Adaptive Resonance Theory (ART) neural networks. We present clustering results using the REUTERS corpus and show an improvement in clustering performance using both entropy and F-measure as evaluation measures.

关键词： Neural networks Subspace constraints Artificial neural networks Organizing Clustering methods computer science automatic control Entropy Information retrieval Search engines

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Database Technology and Industrial Transaction Techniques in control Education

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IFAC Proceedings Volumes 2003年第10期36卷 327-332页

作者： Jana Flochová Miroslav Galbavý Department of Automatic Control Systems Department of Computer Science Faculty of Electrical Engineering and Information Technology Slovak University of Technology Ilkovičova 3812 19 Bratislava Slovak Republic

New developments in computer networks and communications provide new possibilities for control purposes. control systems for highly complex plants are themselves very complex and heterogeneous. A new software infrastructure is needed that exploits these new emerging software technologies. An essential activity to be pursued is that of education and of including new technology in control education. The aim of this paper is to describe some of our activities and experiences in teaching of information techniques and technologies included in open control platforms of complex control systems.

关键词： Information technology Database management systems Relational databases control education Human-machine interface

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Robust tracking performance enhancement through uncertainty division

Robust tracking performance enhancement through uncertainty ...

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European control Conference (ECC)

作者： M. Gil-Martínez M. García-Sanz Electrical Engineering Department University of La Rioja Logroño SPAIN Automatic Control and Computer Science Department Public University of Navarra Pamplona SPAIN

When the process uncertainty size increases, even linear minimum phase systems must sacrifice desirable aggressive feedback control benefits to avoid an excessive ‘cost of feedback’, while preserving the robust stability. With a suitable uncertainty division and a QFT controller-prefilter to command each uncertainty subset inside a controller-scheduler structure, it is possible to enhance the feedback tracking performance without an excessive bandwidth. To preserve the robust stability from any failure in the switching, each controller is designed to be stable in the whole uncertainty domain, and as accurate in command tracking as desired in its uncertainty subset.

关键词： Uncertainty Robustness Upper bound Gain Robust stability Feedback control Tracking loops

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Noise reduction in DNA microarray images based on digital path approach 5

Noise reduction in DNA microarray images based on digital pa...

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5th IFAC Symposium on Modelling and control in Biomedical Systems 2003

作者： Smolka, Bogdan Plataniotis, Konstantinos N. Lukac, Rastislav Venesanopoulos, Anastasios N. Department of Automatic Control Silesian University of Technology Akademicka J6 Str. Gliwice44-101 Poland Department of Electrical and Computer Engineering University of Toronto 10 King's College Road Toronto Canada Slovak Image Processing Center Jarkova 343 Dobsina049 25 Slovakia

In this work we apply the new noise reduction method for the enhancement of the images of gene chips. We demonstrate that the new technique is capable of reducing various kinds of noise present in microarray images and that it enables efficient spot location and estimation of the gene expression level due to the smoodiing effect and preservation of the spot edges. This paper contains the comparison of the new technique of noise reduction with the standard procedures used for the processing of vector valued images, as well as examples of the efficiency of the new algorithm when applied to typical cDNA microarray images. Copyright © 2003 IF AC.

关键词： Image enhancement

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A new robust iterative learning control algorithm for application on a gantry robot

A new robust iterative learning control algorithm for applic...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： J.J. Hatonen T.J. Harte D.H. Owens J.D. Ratcliffe P.L. Lewin E. Rogers Department of Automatic Control and Systems Engineering University of Sheffield Sheffield UK Systems Engineering Laboratory University of Oulu Finland Department of Electronics and Computer Science University of Southampton UK

In this paper a new robust steepest-descent algorithm for discrete-time iterative learning control is introduced for plant models with multiplicative uncertainty. A theoretical analysis of the algorithm shows that if a tuning parameter in the algorithm is selected to be sufficiently large, the algorithm will result in monotonic convergence if the plant uncertainty satisfies a positivity condition. This is a major improvement when compared to the standard steepest-descent algorithm, which lacks a mechanism for finding a balance between convergence speed and robustness. Experimental work on a gantry robot is performed to demonstrate that the algorithm results in near perfect tracking in the limit.

关键词： Robust control Iterative algorithms Robots Convergence Uncertainty Robustness Robotics and automation Systems engineering and theory automatic control Laboratories

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Stability and stabilisation of 2D discrete linear systems with multiple delays

Stability and stabilisation of 2D discrete linear systems wi...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： W. Paszke K. Gatkowski J. Lam Shengyuan Xu E. Rogers D.H. Owens Institute of Control and Computation Engineering University of Zielona Gora Gora Poland Department of Mechanical Engineering University of Hong Kong China Department of Electronics and Computer Science University of Southampton UK Department of Automatic Control and Systems Engineering University of Sheffield UK

In this paper, we study the stability and the stabilisation of 2D discrete linear systems with multiple state delays. All of the new results obtained are based on analysis of the Fornasini-Marchesini state space model with delays and the resulting conditions are given in terms of linear matrix inequalities (LMIs). A numerical example is given to illustrate the effectiveness of the overall approach.

关键词： Stability Linear systems Delay systems Linear matrix inequalities Symmetric matrices automatic control Delay lines Boundary conditions control engineering computing Mechanical engineering

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A delay systems approach to linear differential repetitive processes: controllability and optimization 4

A delay systems approach to linear differential repetitive p...

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4th IFAC Workshop on Time Delay Systems, TDS 2003

作者： Dymkou, S. Rogers, E. Dymkov, M. Galkowski, K. Owens, D.H. School of Information Technology and Mathematical Sciences University of Ballarat VIC33353 Australia Department of Electronics and Computer Science University of Southampton SouthamptonSO17IBJ United Kingdom Institute of Mathematics National Academy of Sciences of Belarus Surganov 11 Minsk220072 Belarus Institute of Control and Computation Engineering Technical University of Zielona Gora Poland Department of Automatic Control and Systems Engineering University of Sheffield SheffieldSI3JD United Kingdom

Differential linear repetitive processes are a class of continuous-discrete 2D linear systems of both systems theoretic and applications interest. The feature which makes them distinct from other classes of such systems is that information propagation in one of the two independent directions only occurs over a finite interval. Applications areas include iterative learning control and iterative solution algorithms for classes of dynamic nonlinear optimal control problems based on the maximum principle. In this paper, we investigate further the structural links between differential linear repetitive processes and a special class of time delay systems. This leads to some significant new controllability and optimal control results for these processes. © 2003 IFAC.

关键词： Time delay

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Sigmoidal weighted vector directional filter

Sigmoidal weighted vector directional filter

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Lecture Notes in computer Science

作者： Lukac, Rastislav Smolka, Bogdan Plataniotis, Konstantinos N. Venetsanopoulos, Anastasios N. Slovak Image Processing Center Jarkova 343 049 25 Dobsina Slovakia Department of Automatic Control Silesian University of Technology Akademicka 16 Str. 44-101 Gliwice Poland Edward S. Rogers Sr. Department of Electrical and Computer Engineering University of Toronto 10 King's College Road Toronto Canada

In this paper, we provide and analyze a sigmoidal optimization of a recently developed class of weighted vector directional filters (WVDFs) outputting the input multichannel sample associated with the minimum sum of weighted angular distances to other input samples. Because the WVDFs can perform a number of smoothing operations in dependence on the weight coefficients, the aim of this paper is to adapt the WVDF behavior to statistical properties of noise and original color image. The filtering results and the complete analysis of the sigmoidal function based WVDF optimization are also provided. © Springer-Verlag Berlin Heidelberg 2003.

关键词： Bandpass filters

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Synthesizing distributed controllers for the safe operation of ConnectedSpaces

Synthesizing distributed controllers for the safe operation ...

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IEEE International Conference on Pervasive Computing and Communications (PerCom)

作者： B. Sridharan A.P. Mathur Kai-Yuan Cai Software Engineering Research Center Department of Computer Sciences Purdue University West Lafayette IN USA Department of Automatic Control Beijing Aeronautics and Astronautics University Beijing China

A collection of one or more devices, each described by its digital device manual and reachable over a network, is a ConnectedSpace. A set of safety policies may be enforced on a ConnectedSpace to ensure the safety of the environment in which the ConnectedSpace is deployed. The enforcement of these safety policies by one or more safely controllers governs the behavior of the devices within the ConnectedSpace. We propose a policy-based partitioning scheme for synthesizing k distributed safety controllers such that: (a) each device is guaranteed to be controlled by no more than two controllers, and (b) each policy is guaranteed to be enforced by exactly one controller. We present an experimental evaluation of our scheme. The experimental results show that the scheme is scalable with respect to the number of devices and the number of policies. We also show how safety controllers that are correct with respect to the policies, are synthesized using the theory of supervisory control.

关键词： Distributed control Safety devices automatic control Medical services Aerospace electronics Aircraft navigation Communication system control Supervisory control Remote monitoring Hospitals

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