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作者： D. Matika H. Ozbolt Ministry of Defense of the Republic of Croatia Zagreb Croatia Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering in Automation University of Zagreb Zagreb Croatia

Based on the research at the location "Middle Adriatic", the analysis of the noise spectrum of the Adriatic Sea is presented. The applied measurement method and necessary instrumentation, followed by the basic scheme of the measurement channel, are given. A representative Adriatic Sea noise spectrum for the particular location is given, with the sea state as a parameter. A regression analysis is made that led to an appropriate approximation polynomial of the spectrum.

关键词： Sea measurements Noise measurement Polynomials Frequency Low-frequency noise Wind speed Control engineering computing Noise level Rain Ice

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High speed calculation of cryptographic hash functions by CNN chips

High speed calculation of cryptographic hash functions by CN...

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IEEE International Workshop on Cellular Nanoscale Networks and their Applications, (CNNA)

作者： M. Csapodi J. Vandewalle T. Roska Analogic and Neural Computing Systems Laboratory Computer and Automation Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary ESAT Laboratory Department of Electrical Engineering Katholieke Universiteit Leuven Leuven Belgium

The paper is concerned with the implementation of cryptographic hash functions on the regular array of simple cellular neural network (CNN) cells with periodic boundary conditions. Cryptographic hash functions enable message origin authentication and validation of message content integrity. A class of cryptographic hash functions-termed Cartesian authentication codes-provide provable (unconditional) security for message authentication between two mutually trustful parties sharing a secret key. We succeeded in implementing existing constructions of Cartesian authentication codes on today's CNN Universal Machine (CNN-UM) chips. Here we prove that rather complex (binary) arithmetic can be performed on a simple CNN chip, by providing an algorithm to implement a specific Cartesian authentication code based on the computation of a polynomial expression over a finite field. The bitrate of the computation is in the 100 Mbit/sec range with existing chips.

关键词： Cryptography Cellular neural networks Message authentication Laboratories Galois fields automation Boundary conditions Turing machines Arithmetic Bit rate

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On the chip implementation of analogic algorithms for optical detection of some layout errors of printed circuit boards

On the chip implementation of analogic algorithms for optica...

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IEEE International Workshop on Cellular Nanoscale Networks and their Applications, (CNNA)

作者： K. Tomordi P. Foldesy P. Szolgay Analogic and Neural Computing Systems Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences (ATOMKI) Budapest Hungary Image Processing and Neurocomputing Department Faculty of Engineering University of Veszprém Veszprem Hungary

Printed circuit board layout inspection methods are mostly based on local geometric information, therefore they are well suited to the cellular neural networks (CNN) paradigm. The wire break, the wire and isolation width violation and an "H" type short circuits detector analogic algorithms were tested on a 20*22 CNN Universal Machine (CNNUM) chip working in the CNN Chip Prototyping System (CCPS) and on the CNN Engine Board (CNNEB), and the results were compared to the commercially available inspection systems.

关键词： Cellular neural networks Inspection Wire Circuit testing Geometrical optics Optical computing Printed circuits Detectors System testing Turing machines

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Advanced manipulation for deep underwater sampling: the AMADEUS research project

Advanced manipulation for deep underwater sampling: the AMAD...

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IEEE Conference on Control Technology and Applications (CCTA)

作者： D.M. Lane G. Bartolini G. Cannata G. Casalino J.B.C. Davies G. Veruggio M. Canals C. Smith Institute of Marine Biology of Creete (IMBC) Crete Greece Department of Mechanical and Chemical Engineering (MCE) Heriot-Watt University Edinburgh UK Department of Computer Communications and System Science (DIST) Università di Genova Genoa Italy Institute for Naval Automation (IAN) CNR Genoa Italy Department of Computing and Electrical Engineering (CEE) Heriot-Watt University Edinburgh UK Department of Geology Geophysics and Paleontology University Autònoma de Barcelona Barcelona Spain

This paper describes the design, development and future activities for the ongoing EU MAST II and III programmes AMADEUS I and II. The AMADEUS is a project focusing on improving the dexterity and sensory abilities of underwater systems for grasping and manipulation of delicate and other objects. Phase I of the project was completed in May 1996, and has developed a prototype dextrous three fingered underwater dextrous gripper. Phase II is now underway to deploy the hand from an underwater robot arm and carry out wet trials with end users. This paper summarizes the major achievements obtained within the programme.

关键词： Sampling methods Fingers Grippers Grasping Sliding mode control Force sensors Prototypes Supervisory control Vibration control Computer architecture

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A Method of PID Controller Autotuning

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IFAC Proceedings Volumes 1997年第6期30卷 597-602页

作者： Nedjeljko Perić Ivan Petrović Ivan Branica University of Zagreb Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering in Automation Unska 3 10000 Zagreb Croatia

A method of PID controller autotuning based on relay feedback control is described. Special attention is paid to the process structure and parameters estimation in the phase of reaching the desired operating point. This may increase the method's robustness and also speed up the tuning procedure. The algorithm's validity is illustrated by some simulation results and an experimental result on a laboratory pilot plant. Il est decrit la mèthode du régulateur d'autoadaptation PID basée au système asservi à relais. L'attention particulierè est consacrée à l'estimation de la structure et des paramètres du procès à la phase dans laquelle on met le proces dans le point de fonetionnement dont on augmente la robustesse et la vitesse de l'autoadaptation. Nous avons presenté certains résultats de la simulation à l'ordinateur ainsi qu'à l'installation pilote qui attestent la validité des algorithmes élaborés.

关键词： Autotuners Describing functions Limit cycles PID controllers Relay control

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Fuzzy Autopilot for Ships Experiencing Shallow Water Effect in Manoeuvering

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IFAC Proceedings Volumes 1997年第22期30卷 99-104页

作者： Zoran Vukić Edin Omerdić Ljubomir Kuljača University of Zagreb Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering in Automation Unska 3 HR-10000 Zagreb Croatia

A fuzzy autopilot for ship path control is proposed. Nonlinear model of a ship and a steering subsystem is used. The autopilot uses heading signal and yaw rate signal to produce a command rudder angle. The autopilot does not use lateral offset from the nominal track. Input variable fuzzyfication, fuzzy associative memory rules and output set defuzzyfication are described. The influence of the shallow water effect during larger maneuver is analyzed.

关键词： Disturbance rejection Fuzzy control Nonlinear control systems Ship control

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Dynamic Positioning of Floating Vessels Postoptimal Analysis

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IFAC Proceedings Volumes 1997年第22期30卷 183-186页

作者： S. Mandžuka Z. Vukić Control Engineering Department Brodarski institute d.o.o. Av. V. Holjevca 20 10000 Zagreb CROATIA Department of Control and Computer Engineering in Automation University of Zagreb Faculty of Electrical Engineering and Computing Unska 3 10000 Zagreb CROATIA

A procedure for the postoptimal analysis of dynamic positioning control system of floating vessels is proposed. The control system design is based on the optimal constrained covariance control (OC 3 ). Using the OC 3 technique, the disadvantages of the classical LQG optimal control technique are avoided. The presented numerical example illustrates the properties of the new approach.

关键词： Positioning system LQG control Optimization problems

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Orthogonal fuzzy model of the solder paste printing stage of surface mount technology

Orthogonal fuzzy model of the solder paste printing stage of...

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IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： A. Lotfi M. Howarth P.D. Thomas Manufacturing Automation Research Group Department of Mechanical and Manufacturing Engineering Nottingham Trent University Nottingham UK Real Time Machine Control Research Group Department of Computing Nottingham Trent University Nottingham UK

The novel idea of an orthogonal fuzzy rule-based system is introduced in this paper. It is shown that in a fuzzy rule-based system where rules are orthogonal, each rule induces its maximum effect on the final decision. Using 18 orthogonal fuzzy rules, a model for the solder paste printing stage of SMT is created. The predicted percentage of deposit volume from the orthogonal and non-orthogonal models are compared with actual values. The orthogonal model shows less error in 85% of the data points.

关键词： Printing Surface-mount technology Fuzzy systems Knowledge based systems Input variables Manufacturing automation Fuzzy set theory Bismuth Machine control Computer aided manufacturing

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Predictive gain scheduling autopilot for ships

Predictive gain scheduling autopilot for ships

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Mediterranean Electrotechnical Conference (MELECON)

作者： Z. Vukic L. Kuljaca D. Milinovic Department of Control Engineering and Computer Engineering in Automation Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia

The paper presents results of research with the new predictive autopilot structure (PIP+D) with gain scheduling. The autopilot is tested and compared with conventional PID autopilot for a mariner class ship. The autopilot parameters are changed with the speed of the ship using the gain scheduling technique. Results obtained during the research show that the proposed autopilot structure is to be recommended if improved performance is of prime interest, when the velocity of the ship is changing. The analysis is based on the simulation of a mariner class ship as a nonlinear system, with the steering servo system taken as a nonlinear model. Results of the simulation are included.

关键词： Marine vehicles Limit-cycles Gears Servomechanisms System testing Spirals Mathematical model Performance gain Regulators

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Modelling and simulation of diesel electrical aggregate voltage controller with current sink

Modelling and simulation of diesel electrical aggregate volt...

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IEEE International Conference on Industrial Technology (ICIT)

作者： G. Erceg S. Tesnjak R. Erceg Department of Electric Machines and Automation Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia Department of Electric Power Engineeering Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia

In the paper modeling and simulation of a diesel motor with speed control system and generator with voltage system as complex, nonlinear and multivariable systems are presented. Mathematical models for every part of a diesel electrical aggregate (diesel motor with its speed control system, synchronous generator, synchronous exciter, self-excited compounding unit, voltage controller and load) are developed and connected in a common model of the aggregate. Based upon these mathematical models of the aggregate, a simulation model is made using the "Matrix/sub x/" simulation software package. The paper also deals with comparison of characteristics seen from the simulation aspect and measurements. Bringing into the model new current sink simulation results, it better matches experimental results. So, this model can be used for selection of the diesel electrical aggregate's type and for analyzing the quality of load supply.

关键词： Aggregates Voltage control Synchronous motors Mathematical model Pulse width modulation Switches Control systems Velocity control Synchronous generators Frequency

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