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Mediterranean Conference on control and Automation (MED)

作者： D. Duzanec Z. Stare Z. Kovacic Ziegler d.o.o. Construction and Development Department Zagreb Croatia Department of Electronic Systems and Information Processing University of Zagreb Faculty of EE&C Croatia Department of Control and Computing Engineering University of Zagreb Faculty of EE&C Zagreb Croatia

In this paper we describe a design and implementation of an on-line scheduling algorithm for controller area network (CAN) messages that exploits properties of genetic algorithms (GA) to achieve global message throughput optimization. The use of GA-based scheduler has been found effective even in time-critical distributed control systems, such as the considered control system that encompasses several control subsystems at the fire fighting vehicle. The experimental results show that the GA-optimized CAN message scheduler considerably decreased the average message queuing time.

关键词： control systems Algorithm design and analysis Scheduling algorithm Genetic algorithms Throughput Design optimization Time factors Distributed control Fires Vehicles

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Parallel multi-model switched control for ship roll stabilization

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Proceedings of the Institution of Mechanical Engineers Part M: Journal of engineering for the Maritime Environment 2006年第2期220卷 53-65页

作者： Roberts, G.N. Cournou, V. Vinsonneau, B. Burnham, K.J. Control Theory and Applications Centre Faculty of Engineering and Computing Coventry University Coventry United Kingdom Control Theory and Applications Centre Faculty of Engineering and Computing Coventry University Priory Street Coventry CV1 5FB United Kingdom

This paper concerns the application of a parallel multi-model switched control (PMMSC) scheme for integrated fin and rudder roll stabilization (INFERS). The PMMSC algorithm uses a two-level hierarchical control strategy where, at the lower level, a bank of controller pairs (fin roll and rudder roll controllers) are designed for a range of preselected operating conditions, and, at the upper level, a decision maker decides which controller pair is most suited to the prevailing conditions and ensures that the appropriate controller pair is switched into operation. A novel approach of characterizing roll angle data using power spectral density (PSD) histograms is presented. It is shown how the PSD histograms for different encounter angles exhibit sufficiently different characteristics to enable them to be used by the PMMSC algorithm to produce reliable switching between controller pairs. Simulation studies demonstrate the efficacy of the PMMSC when applied to an identified ship model. © IMechE 2006.

关键词： Switching systems

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Single-photon quantum key distribution in the presence of loss

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Physical Review A 2007年第5期75卷 052336-052336页

作者： Marcos Curty Tobias Moroder Center for Quantum Information and Quantum Control Department of Physics and Department of Electrical & Computer Engineering University of Toronto Toronto Ontario Canada M5S 3G4 Institute for Quantum Computing University of Waterloo 200 University Avenue West Waterloo Ontario Canada N2L 3G1 Quantum Information Theory Group Institut für Theoretische Physik I and Max-Planck Research Group Institute of Optics Information and Photonics Universität Erlangen-Nürnberg D-91058 Erlangen Germany

We investigate two-way and one-way single-photon quantum key distribution (QKD) protocols in the presence of loss introduced by the quantum channel. Our analysis is based on a simple precondition for secure QKD in each case. In particular, the legitimate users need to prove that there exists no separable state (in the case of two-way QKD), or that there exists no quantum state having a symmetric extension (one-way QKD), that is compatible with the available measurements results. We show that both criteria can be formulated as a convex optimization problem known as a semidefinite program, which can be efficiently solved. Moreover, we prove that the solution to the dual optimization corresponds to the evaluation of an optimal witness operator that belongs to the minimal verification set of them for the given two-way (or one-way) QKD protocol. A positive expectation value of this optimal witness operator states that no secret key can be distilled from the available measurements results. We apply such analysis to several well-known single-photon QKD protocols under losses.

关键词： SEPARABILITY CRITERION NONORTHOGONAL STATES COHERENT STATES CRYPTOGRAPHY PROTOCOL DIFFERENTIATE SECURITY THEOREM PROOF

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Comparison of seven approaches for holter ECG clustering and classification

Comparison of seven approaches for holter ECG clustering and...

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29th Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBS 2007), vol.10

作者： Vaclav Chudacek Milan Petrik George Georgoulas Miroslav Cepek Lenka Lhotska Chrysostomos Stylios Gerstner laboratory at Department of Cybernetics Czech Technical University Czech Republic Czech Republic Department of Cybernetics Center for Machine Perception Czech Technical University Czech Republic Intelligent Control Systems Laboratory Georgia Technology Research Institute Atlanta USA Czech Republic Department of Computer Science and Engineering Neural Computing Group Czech Technical University Czech Republic Czech Republic Department of Cybernetics Gerstner Laboratory Czech Technical University Czech Republic Department of Informatics and Communications Technology TEI Epirus Artas Greece

In this work we present a comparative study, testing selected methods for clustering and classification of holter electrocardiogram (ECG). More specifically we focus on the task of discriminating between normal 'N' beats and premature ventricular 'V' beats. Some of the tested methods represent the state of the art in pattern analysis, while others are novel algorithms developed by us. All the algorithms were tested on the same datasets, namely the MIT-BIH and the AHA databases. The results for all the employed methods are compared and evaluated using the measures of sensitivity and specificity.

关键词： Electrocardiography Testing Decision trees Laboratories Cybernetics Sensitivity and specificity Heart rate variability Clustering algorithms Spatial databases Computational complexity

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The windowing effect in cerebral pattern classification: An application to brain computer interface technology

The windowing effect in cerebral pattern classification: An ...

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4th IASTED International Conference on Biomedical engineering

作者： Pérez, José Luis Martínez Cruz, Antonio Barrientos Department of Automatic Control Electrical Engineering and Industrial Computing Industrial Engineering School Universidad Politécnica de Madrid Madrid Spain

ISBN: (纸本)0889865787

The Brain Computer Interface technology allows the communication between people and mechanical devices controlled by microprocessors [1] [8]. It translates the human mental activity into device commands. The kernel of this technology is an algorithm that takes samples, filters and classifies the electro-encephalographic signal [2] [3] [4] [5]. In this paper, different types of filtering windows are considered, the main objective is to determine the type of window with best results in the discrimination stage, when the user is thinking about different activities;as secondary result the most relevant features are extracted. With an earlier and better discrimination the classifier would be easier to implement, faster and more reliable[14].

关键词： Human computer interaction

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Multi agent systems in diagnostics and exception handling of batch processes

Multi agent systems in diagnostics and exception handling of...

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CHISA 2006 - 17th International Congress of Chemical and Process engineering

作者： Burian, P. Department of Computing and Control Engineering University of Chemical Technology in Prague Technická 5 166 28 Praha 6 Czech Republic

ISBN: (纸本)8086059456

Agent is an active, permanent computer entity which is able to perceive, to behave "reasonably" towards its environment, to actuate on them (agents) and which is able to communicate with other agents. For mutual communication, negotiation, cooperation, coordination and collaboration among agents the higher-level language ACL (Agent Communication Language) is used. Agents may also help in fault detection and diagnostics. Simple model equations rewriten on discretized residual form, compare measurement values from process with calculated simple model equations. Exception handling is a critical element for achieving long-term success in batch production. Correct handling of exceptions is a key element in process safety, consistent product quality, and production cost minimalization. In Exception handling Agents represent Agent with the equipment-state machine and Agent with the procedure-state machine. Jadex is a Java based, FIPA compliant agent environment, and allows to develop goal oriented agents following the BDI model. Jadex provides a framework and a set of development tools to simplify the creation and testing of agents. Visual Paradigm for the Unified Modeling Language (VP-UML) is a UML CASE tool. Visual Paradigm for UML is a professional but easy-to-use UML modeling tool that supports complete software life-cycle - analysis, design, implementation, testing and deployment.

关键词： Multi agent systems

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A novel approach to automatic music composing: Using genetic algorithm

A novel approach to automatic music composing: Using genetic...

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International Computer Music Conference, ICMC 2006

作者： Zad, Damon Daylamani Araabi, Babak N. Lucas, Caru Department of Information Systems and Computing Brunel University United Kingdom Dept. of Electrical and Computer Engineering Control and Intelligent Processing Center of Excellence University of Tehran Iran

Artificial music composition is one of the ever rising problems of computer science. Genetic Algorithm has been one of the most useful means in our hands to solve optimization problems. By use of precise assumptions and adequate fitness function it is possible to change the music composing into an optimization problem. This paper proposes a new genetic algorithm for composing music. Considering entropy of the notes distribution as a factor of fitness function and developing mutation and crossover functions based on harmonic rules and trying to keep the melodies intact during these processes would result in a musical piece pleasant to human ears and interesting for human mind. This algorithm does not have the constraints of the previous algorithms. Restraining mutation and crossover functions with a goal of producing melodies based on acceptable melodies composed by humans, this algorithm is not bound to any genre, instrument or melody. The experimental results of this approach show that it is near to the human composing and the results produced from it are more acceptable than the ones produced by its predecessors.

关键词： Genetic algorithms

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A NONLINEAR PID-BASED MULTIPLE controlLER INCORPORATING A MULTILAYERED NEURAL NETWORK LEARNING SUBMODEL

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control AND INTELLIGENT SYSTEMS 2006年第3期34卷 177-185页

作者： Zayed, A. S. Hussain, A. Grimble, M. J. Department of Computing Science and Mathematics University of Stirling FK9 4LA United Kingdom Industrial Control Centre Department of Electronic and Electrical Engineering University of Strathclyde Glasgow G1 1XW United Kingdom

A new nonlinear minimum-variance adaptive proportional integral derivative (PID) based multiple controller, incorporating a multi-layered neural network learning submodel, is presented. The unknown non-linear plant is represented by an equivalent stochastic model consisting of a linear least-squares-based submodel plus a non-linear multi-layered back propagation (BP) neural network-based learning submodel. The proposed multiple controller methodology provides the designer with a choice of using either a conventional PID self-tuning controller, a PID structure-based pole-placement controller, or a newly proposed PID structurebased pole-zero placement controller through simple switching. The novel PID structure based pole-zero placement controller employs an adaptive mechanism, which ensures that the closedloop poles and zeros are located at their prespecified positions. The switching decision between the different nonlinear fixed structure controllers is made manually in the present case but can be automated using fuzzy logic or stochastic learning automata techniques. Simulation results using a nonlinear plant model demonstrate the effectiveness of the proposed multiple controller with respect to tracking set-point changes. The aim is to achieve a desired speed of response while penalizing excessive control action, for applications in nonminimum phase and unstable systems.

关键词： Multiple controller PID pole placement zero-pole placement learning submodel neural networks

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Computational issues of signal analysis in time domain

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WSEAS Transactions on Computers 2006年第12期5卷 2919-2926页

作者： Hlupić, Nikica Basch, Danko Fertalj, Krešimir Department of Applied Computing University of Zagreb Faculty of Electrical Engineering and Computing Unska 3 Zagreb 10000 Croatia Department of Control and Computer Engineering University of Zagreb Faculty of Electrical Engineering and Computing Unska 3 Zagreb 10000 Croatia

This paper elaborates the present stage and predictable direction of future development of Sine Wave Calculator (SWC), a simple method for signal analysis in time domain that provides accuracy comparable to the best classical methods (relative errors about few times 10-6). The main SWC advantages are extreme simplicity, possibility of selection of samples and straightforward calculations, which makes it preferable solution for quick implementation. The main shortage is still unknown mathematical analysis of errors, which are probably unequal for different signal parameters.

关键词： Time domain analysis

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Supervisory control by using active virtual 3D models in-the-loop

Supervisory control by using active virtual 3D models in-the...

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IEEE International Conference on Computer-Aided Design

作者： Tomislav Reichenbach Damjan Miklic Zdenko Kovacic Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering in Automation University of Zagreb Croatia

Virtual 3D models play important role in a today factory layout design, physical modeling, control synthesis, performance analysis, dynamic simulation and visualization of real systems. In this paper, we go one step further and besides visualization, we monitor all measurable states in the real system and use active 3D models in-the-loop for real-time supervisory control. Such concept enables an event detection not possible with conventional sensors, including the ability to predict possible outcomes in the system operation. A virtual environment simulator and the way it can be connected to other simulators (e.g., Matlab/Simulink), is presented. The examples of virtual sensors, and collision free-based trajectory planning for robotic manipulators are demonstrated

关键词： Supervisory control Mathematical model Visualization Production facilities control system synthesis Performance analysis Analytical models Real time systems Event detection Sensor systems

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