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International Symposium on Applied Computational Intelligence and Informatics ( SACI)

作者： Laszlo Horvath Imre J. Rudas Simona Vaivoda Zsuzsa Preitl Institute of Intelligent Engineering Systems John von Neumann Faculty of Informatics Budapest Hungary Department of Automation and Applied Informatics Fac. of Automation and Computer Science Polytechnic University of Timisoara Timisoara Romania

Engineering for development, production, and other product related company activities are being organized in virtual systems for lifecycle management of product data. This new age of engineering is a result of the continuous development for step-by-step moving of product design, analysis and other production engineering activities from conventional environments to modeling environments during the eighties and nineties. However, more developments were needed in knowledge based decision assistance in order to realize modeling of human intent, increasingly complex product structures, and efficient communication of product data. In recent years, a great change of engineering methodology and software produced program products in knowledge technology and advanced local and global communication. Group work of engineers is increasingly organized around special portals for engineering on the Internet. Although intensive research activities produced outstanding methods in knowledge-based solutions for engineering, these methods have not widespread in the industrial modeling practice. This paper attempts to evaluate the possibility that recent communication and knowledge intensive engineering modeling can be developed into communication and knowledge intensive virtual space technology. Paper starts with a discussion on integrated application of different groups of product modeling techniques. Following this, methods are evaluated for the management of product data (PDM). Next section emphasizes aspects, contexts, and intents as primary issues in modeling for relationships in product data and decisions by engineers. Finally, methods for the management of engineering activities for lifecycle of products are summarized, considering communities of engineers around Internet portals.

关键词： Knowledge engineering Data engineering Engineering management Portals Internet Production systems Design engineering Product design Production engineering Humans

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STATIC RRC TIMEOUTS FOR VARIOUS TRAFFIC SCENARIOS

STATIC RRC TIMEOUTS FOR VARIOUS TRAFFIC SCENARIOS

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18th International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2007), vol.2

作者： Florian Liers Christian Burkhardt Andreas Mitschele-Thiel Faculty of Computer Science and Automation Technical University Ilmenau Germany

The operator of an UMTS radio access network has to define timeout thresholds for the radio resource control protocol. These timeouts have a strong influence on the quality of service of the user traffic. In general long timeouts favour the call setup time over the outage probability. For short timeouts it is the other way around. Furthermore the reached quality of service level depends on the load in the system. The load consists of the number of users in the system and the services they are using. This paper investigates the relationship between these both parameters and the previously mentioned quality of service parameters. We present results of five different timeout settings, tested in various network settings. Simulations show that very high timeout values have an insignificant influence on call setup time but increase the outage. We highlight two timeout settings which fits the requirements on user experience and operators expectations best.

关键词： Quality of service 3G mobile communication Resource management Switches Communication system traffic control Web pages Radio access networks Radio control Access protocols Switching circuits

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NEURAL-ADAPTIVE CONTROL BASED ON ADALINE NEURONS WITH APPLICATION TO A POWER SYSTEM

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IFAC Proceedings Volumes 2007年第18期40卷 457-464页

作者： Ioan Filip Octavian Prostean Florin Dragan Cristian Vasar Department of Control System Engineering “Politehnica” University from Timisoara Faculty of Automation and Computer Science 300223 Timisoara Romania Phone: (+40) 0256-403238 E-Mail: ioan.filip@aut.upt.ro

A neural-adaptive control solution is exposed in this paper. The control strategy is based on the linear adaptive neuron, which is called ADALINE. Unlike other neural control solutions, based on perceptrons neurons characterized by a long time learning process and a difficult on-line tuning of weights, this approach uses a fast algorithm, which adapts on-line the neuron's weights. Therefore the non-linear character of control law is induced by the permanent changes of neuron weights, which are variable parameters of controller. A set of study cases is done, with application to the excitation control of a synchronous generator.

关键词： adaptive control neural networks ADALINE modelling simulation synchronous generator

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SHORT TERM ELECTRIC LOAD FORECAST WITH ARTIFICIAL NEURAL NETWORKS

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IFAC Proceedings Volumes 2007年第18期40卷 443-449页

作者： Vasar Cristian Szeidert Iosif Filip Ioan Prostean Gabriela Department of Control System Engineering “Politehnica” University from Timisoara Faculty of Automation and Computer Science 300223 Timisoara Romania Phone: (+40) 256-403237 E-Mail: cristian.vasar@aut.upt.ro

This paper presents issues regarding short term electric load forecasting using feedforward and Elman recurrent neural networks. The study cases were developed using measured data representing electrical energy consume from Banat area. There were considered 35 different types of structure for both feedforward and recurrent network cases. For each type of neural network structure were performed many trainings and best solution was selected. The issue of forecasting the load on short term is essential in the effective energetic consume management in an open market environment.

关键词： neural networks prediction problems load forecasting feedforward networks simulation

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Weighted Centroid Localization in Zigbee-based Sensor Networks

Weighted Centroid Localization in Zigbee-based Sensor Networ...

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IEEE International Symposium on Intelligent Signal Processing

作者： Jan Blumenthal Ralf Grossmann Frank Golatowski Dirk Timmermann Faculty of Computer Science and Electrical Engineering Institute of Applied Microelectronics and CE Warnemunde Germany Inst. of Appl. Microelectron. & CE Rostock CELISCA Center for Life Science Automation University of Rostock Germany

ISBN: (纸本)9781424408290;1424408296

Localization in wireless sensor networks gets more and more important, because many applications need to locate the source of incoming measurements as precise as possible. Weighted centroid localization (WCL) provides a fast and easy algorithm to locate devices in wireless sensor networks. The algorithm is derived from a centroid determination which calculates the position of devices by averaging the coordinates of known reference points. To improve the calculated position in real implementations, WCL uses weights to attract the estimated position to close reference points provided that coarse distances are available. Due to the fact that Zigbee provides the link quality indication (LQI) as a quality indicator of a received packet, it can also be used to estimate a distance from a node to reference points.

关键词： Wireless sensor networks ZigBee Time measurement Intelligent sensors Signal processing automation computer science Microelectronics Application software Electric variables measurement

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Exponential Synchronization of Complex Delayed Dynamical Networks with General Topology

Exponential Synchronization of Complex Delayed Dynamical Net...

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Proceedings of the 46th IEEE Conference on Decision and Control, Pages 460-918

作者： Tao Liu Georgi M. Dimirovski Jun Zhao Key Laboratory of Integrated Automation of Process Industry Ministry of Education Faculty of Information Science and Engineering Northeastern University Shenyang Liaoning China Faculty of Electrical and Computer Engineering SS Cyril and Methodius University Skopje Macedonia Department of Computer Engineering Dogus University Istanbul Turkey

ISBN: (纸本)9781424414970;1424414970

The global exponential synchronization of complex delayed dynamical networks possessing general topology is investigated in this contribution. The network model considered can represent both the directed and undirected weighted networks. Novel delay-dependent linear controllers are designed via Lyapunov stability theory and appropriate property of the coupling matrix. It is shown that the controlled network is globally exponentially synchronized with a given convergence rate. Two examples of typical dynamical networks with coupling delays of this class, one possesses directed and the other with undirected coupling topology, both having a Lorenz system at each node, have been used to demonstrate and verify the novel control design proposed.

关键词： Mentoring topology design control dynamic network Network Exponential network model linear controllers

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A Simplified Variable Speed Switched Reluctance Motor Drive without Using Encoder

A Simplified Variable Speed Switched Reluctance Motor Drive ...

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International Conference on Electrical Machines and Systems 2007(ICEMS2007)(第十届国际电机与系统会议)

作者： P. Jitkreeyarn K. Tungpimolrut P. Somsiri S. Kachapornkul Akira Chiba Norimasa Tanabe Tadashi Fukao Industrial Control and Automation Laboratory National Electronics and Computer Technology Center Department of Electrical Engineering Faculty of Science and Technology Tokyo University of Science

The switched reluctance motor (SRM) and drive system is a candidate in various applications including the home appliance. The simple and low cost system with an adequate performance is also one topic to be developed. A speed sensor directly increases the cost and it directly influences the reliability of the system. This paper proposes a simplified variable speed control system for the SRM without using an encoder. The method is not based on the exact rotor position estimation, only the turn off angle is determined from the simple relation between measured terminal voltage and current. The effectiveness of the proposed method is verified by the experimental result on the 3 kW 3-phase 6-stator-pole and 4-rotor-pole SRM.

关键词： Switched reluctance motor variable speed drive system turn off angle rotor position estimation

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A Design of 15 kW Switched Reluctance Motor for Electric Vehicle Applications

A Design of 15 kW Switched Reluctance Motor for Electric Veh...

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International Conference on Electrical Machines and Systems 2007(ICEMS2007)(第十届国际电机与系统会议)

作者： P. Jitkreeyarn K. Tungpimolrut S. Kachapornkul P. Somsiri Tadashi Fukao Akira Chiba Industrial Control and Automation Laboratory Section National Electronics and Computer Technology C Department of Electrical Engineering Faculty of Science and Technology Tokyo University of Science

In this paper, a design of the 3-phase, 6-stator-pole and 4-rotor-pole, 15 kW switched reluctance motor for the propulsion system of the electric vehicle is presented. Its performance such as the torque per volume and... 详细信息

关键词： Switched reluctance motor motor design electric vehicle

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Decentralized Synchronization of an Uncertain Complex Dynamical Network

Decentralized Synchronization of an Uncertain Complex Dynami...

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American Control Conference (ACC)

作者： Wei-Song Zhong Georgi M. Dimirovski Jun Zhao Key Laboratory Integrated Automation of Process Industry-Ministry of Education and School of Information Science Engineering Respectively Northeastern University Shenyang Liaoning China SS Cyril and Methodius Faculty of Electrical Engineering Information Technologies Skopje Macedonia Department of Computer Engineering Dogus University Kadikoy Turkey

A class of uncertain time-varying complex dynamical networks is studied in this paper and a model introduced. On the grounds of that model then the locally and globally decentralized synchronization of these networks are thoroughly investigated. Several network synchronization criteria are deduced. Especially, the assumptions adopted and decentralized control laws designed are considerably simple. An illustrative example along with the respective numerical and computer simulation results is also given to demonstrate the effectiveness of the proposed synchronization control synthesis.

关键词： Complex networks Network synthesis Large-scale systems Robust control Distributed control Control systems Network topology Robustness Chaos Robust stability

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Limiting UMTS dropping rate with control-based CAC algorithm

Limiting UMTS dropping rate with control-based CAC algorithm

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2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC

作者： Liers, Florian Hochberg, Bernd Malicke, Markus Mitschele-Thiel, Andreas Faculty of Computer Science and Automation Technical University of Ilmenau Germany

ISBN: (纸本)1424403294

The resource consumption of mobile users within a UMTS communication system fluctuates over time due to their communication behavior and the link quality. Due to the limited resources of UMTS systems congestion may occur. The rising needs for resources may even force the system to drop active calls. In order to prevent such dropping events, permission requests for new calls may by rejected, if the system load is high or is expected to be high in the future. In this paper we present a control theory approach for adjusting the UMTS RRC call admission control threshold according to the current traffic situation in a UMTS cell. This algorithm prevents the dropping rate to exceed a predefined limit, as shown by our simulation results. © 2006 IEEE.

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