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2011 2nd ETP/IITA Conference on Telecommunication and Information, TEIN 2011

作者： Wenbing, Wu Shuqun, Yang Yijian, Huang Dept. of Computer Fuzhou Technical College of Foreign Studies Fuzhou Fujian China School of Information Science and Technology Xiamen University Xiamen Fujian China Faculty of Software Fujian normal university Fuzhou Fujian China College of Mechanical Engineering and Automation Huaqiao University Quanzhou Fujian China

ISBN: (纸本)9789881824202

Speed-regulating valve is an important component of a hydraulic system, and it is easy to go wrong. How to diagnose the faults is very important for the maintenance of mechanic system. By means of wavelet packet, this paper first extracts features from the power spectrum of signals in normal and fault state respectively, then the features are input to a LSSVM as parameters to diagnose faults, and the result is satisfactory. ©2011 ETP.

关键词： Failure analysis

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A particle swarm and neural network approach for position control of XY Piezo Actuator Stage

A particle swarm and neural network approach for position co...

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19th International Workshop on Robotics in Alpe-Adria-Danube Region, RAAD 2010

作者： Kusić, Dragan Čas, Jure Faculty of Electrical Engineering and Computer Science Institute of Automation University of Maribor Slovenia Faculty of Electrical Engineering and Computer Science Institute of Robotics University of Maribor Slovenia

ISBN: (纸本)9781424468867

This paper describes a position control of 2 degrees of freedom (DOF) XY Piezo Actuator Stage (XY PAS) with Feedforward Neural Network (FNN) and additional Particle Swarm Optimization (PSO) approach, which is used as an improved learning method for optimizing the weights of FNN rather than just the standard technique of back-propagation of errors. XY PAS is fabricated by a photo structuring process from micro-structured photosensitive glass and two piezo actuators (PEAs), which are built-on to meet the request for its precise movement on the working plane with approximate dimensions 60 by 60 micrometres. It is evident from the simulation model of XY PAS, that accurate positional control is an exact piece of work. The FNN is used as adaptive feedforward controller describing the estimated inverse function of XY PAS for each reference position of XY PAS's tip. Due to the optimal control performance of FNN, the PSO is introduced in order to improve the learning method of FNN. A simulation model of the XY PAS and the proposed FNN control algorithm with PSO have been developed in Matlab/Simulink. The obtained results show quick convergence capability and a satisfactory global search. © 2010 IEEE.

关键词： Position control

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A surrogate approach for the global optimization of signal settings and traffic assignment problem

A surrogate approach for the global optimization of signal s...

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International IEEE Conference on Intelligent Transportation Systems

作者： Adacher, Ludovica Cipriani, Ernesto Faculty of Engineering Department of Computer Science and Automation University of Roma Tre Italy Faculty of Engineering Department of Science of Civil Engineering University of Roma Tre Italy

ISBN: (纸本)9781424476572

We extend a 'surrogate problem' approach that is developed for a class of stochastic discrete optimization problems so as to tackle the global signal settings and traffic assignment combined problem. We compare a stochastic method based on the surrogate approach, called Surrogate Method (SM), with a Projected Gradient Algorithm (PGA), which uses the Armijo rule for the step size estimation routine. Numerical experiments conducted on a test network show that the surrogate method converges to a really small area and it finds much more efficient solutions. ©2010 IEEE.

关键词： Global optimization

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An analysis of the BBO Fans online social gaming community

An analysis of the BBO Fans online social gaming community

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作者： Posea, Vlad Balint, Mihaela Dimitriu, Alexandru Iosup, Alexandru Faculty of Automation and Computer Science Politehnica University of Bucharest Romania Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technology Netherlands

ISBN: (纸本)9781424473359

Online social gaming is an emerging Internet application that combines online gaming and online social networking functionality for the benefit of millions of daily users. While researchers have investigated the structure of (social) networks for decades, the activity characteristics and the community structure of online social gaming remain relatively unknown. To address this situation, in this work we investigate the BBO Fans club for online bridge. First, we introduce a method to collect and analyze data from BBO Fans and its underlying gaming platform. Our method is novel in that it addresses the lack of a strict definition of social relationship between BBO Fans players, and it defines several player types with implications on community formation and operation. Second, we use the proposed method to collect and analyze a 40-day BBO Fans dataset comprising over 140,000 unique players and over 3,000,000 unique play sessions. T hird, we compare the characteristics of BBO Fans with other large social networking and online gaming applications. We find in particular that BBO Fans generates similar levels of activity as but has different community characteristics than similarly-sized games on FaceBook, the largest social network in the world.

关键词： Data mining

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Display module for wireless embedded communication system

Display module for wireless embedded communication system

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作者： Demeter, Robert Automation Department Faculty of Electrical Engineering and Computer Science Transilvania University of Brasov Brasov Romania

ISBN: (纸本)9781424473359

This paper presents a practical implementation of a custom wireless access point with display module to view the communication and configuration parameters. For the display module we design a hierarchy menu system, with control buttons that enable the user to scroll to specific types of information and select between parameters. The display module is very useful for embedded systems with limited resources because it offers status information about connected users, ROMIRAM usage, IP address, connection types, transfer rates, bandwidth, etc. without the need to enter the configuration menu using web interface.

关键词： Embedded systems

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Analysis of RFID security and privacy by means of identification and authentication protocols

Analysis of RFID security and privacy by means of identifica...

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IEEE International Joint Conferences on Computational Cybernetics and Technical Informatics, ICCC-CONTI 2010

作者： Hurjui, Cristina Graur, Adrian Stefan Cel Mare University of Suceava Faculty of Electrical Engineering and Computer Science Department of Computers and Automation Suceava Romania

ISBN: (纸本)9781424474332

When analyzing the Radio Frequency Identification applications, one might think of two essential hierarchies: the structures aiming to offer security to an RFID system and the structures aiming to offer functionality means, with no security issues. One should know precisely the significance of these notions. Radio Frequency Identification represents an advanced wireless technology, which integrates an essential solution within the fields of intelligent chips and automation technologies. In this paper, four protocols based on updating the tags' identifiers by means of RFID readers will be compared, in order to carry out an analysis over the jeopardizing points that threaten the security and privacy of RFID systems. Cryptography signifies a way of creating RFID systems more secure. A chaotic matter is brought into discussion, by the following situations: to And out if it is a protocol of identification or authentication that is necessary, depending on various RFID applications or systems. Such analysis over RFID security has carried out wide thoughts. © 2010 IEEE.

关键词： Authentication

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Improvement of recurrent fuzzy detection/diagnosis functions modeling. A temporal modeling application for fault states in a manufacturing system

Improvement of recurrent fuzzy detection/diagnosis functions...

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2010 8th IEEE International Conference on Control and automation, ICCA 2010

作者： Minca, Eugenia Dragomir, Otilia Elena Brezeanu, Iulian Dragomir, Florin Valahia University of Targoviste Electrical Engineering Faculty Automation Computer Science and Electrical Engineering Department 18 Unirii Av. Targoviste Romania

ISBN: (纸本)9781424451951

This article proposes a new approach in modeling the detection/diagnostic functions using PN. It assumes knowledge of the evolution of successive degradation states of the monitored system. Using the logical model, corresponding to the change in system degradation state, hierarchical levels are identified, corresponding to the successive external events with which this model is synchronized. A dedicated hierarchical structure is constructed, capable to repeatedly carry out a fixed defect detection scheme. Each hierarchical level executes this action in temporal windows which are progressively increased. The proposed structure allows the detection function to be rerun on a hierarchical level by preserving information from the previous level. This is the recurrent aspect of the paper. The present proposal is a refined modeling of the detection function because it leads to the identification of temporal windows in which a given degradation state might appear. For modeling the recurrent aspect, between hierarchical levels there is an information subsystem based and LIFO and OOPN (Object Oriented Petri Nets). The present paper enhances similar approaches of the authors, carried out through the recurrent modeling of the monitoring function. © 2010 IEEE.

关键词： Petri nets

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A fuzzy approach to intelligent control of low voltage electrical networks with distributed power from renewable resources

A fuzzy approach to intelligent control of low voltage elect...

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2010 IEEE International Energy Conference and Exhibition, EnergyCon 2010

作者： Dragomir, Florin Dragomir, Otilia Elena Minca, Eugenia Automation Computer Science and Electrical Engineering Department Valahia University of Targoviste Electrical Engineering Faculty 18 Unirii Av. Targoviste Romania

ISBN: (纸本)9781424493807

Due to the complexity of modern distributed power generation, a conventional automation system is not always capable to provide sufficient information, so intelligent control approaches are requiring. This paper is concerned with intelligent control technologies applied to distributed power generation network. Precisely it presents a fuzzy controller based control solution, developed with Matlab that allows the implementation of different renewable energy resources (RES) in a distributed power energy network (PD) and ensures a greater stability. © 2010 IEEE.

关键词： Intelligent control

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Stability Analysis of Fuzzy Logic Control Systems for a Class of Nonlinear SISO Discrete-Time Systems

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IFAC Proceedings Volumes 2011年第1期44卷 13612-13617页

作者： Radu-Emil Precup Marius-Lucian Tomescu Stefan Preitl Emil M. Petriu Claudia-Adina Dragoş Department of Automation and Applied Informatics “Politehnica” University of Timisoara Bd. V. Parvan 2 RO-300223 Timisoara Romania (Tel: +40-256403229 Computer Science Faculty “Aurel Vlaicu” University of Arad Complex Universitar M Str. Elena Dragoi 2 RO-310330 Arad Romania Department of Automation and Applied Informatics “Politehnica” University of Timisoara Bd. V. Parvan 2 RO-300223 Timisoara Romania School of Information Technology and Engineering University of Ottawa 800 King Edward Ottawa Ontario K1N 6N5 Canada

Abstract This paper suggests a new stability analysis theorem dedicated to a class of fuzzy logic control systems. The fuzzy logic control systems consist of nonlinear Single Input-Single Output (SISO) discrete-time processes controlled by Takagi-Sugeno fuzzy logic controllers. The stability analysis is conducted on the basis of Lyapunov's direct method with quadratic Lyapunov function candidates. The theorem proves that if the derivative of the Lyapunov function candidate is negative definite in the active region of each fuzzy rule then the fuzzy logic control system will be asymptotically stable in the sense of Lyapunov. Sufficient stability conditions are offered. An example related to the design of a stable fuzzy logic control system for the discrete-time Lorenz chaotic system and simulation results are included.

关键词： Discrete-time systems fuzzy logic control Lyapunov function candidates nonlinear systems stability analysis

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Phymss - Performance hybrid model solver and simulator based on UML MARTE diagrams

Phymss - Performance hybrid model solver and simulator based...

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1st Joint WOSP/SIPEW International Conference on Performance engineering, WOSP/SIPEW'10

作者： Chişe, Cosmina Jurca, Ioan Department of Computer Science and Engineering Faculty of Automation and Computers University of Timisoara 2 V. Parvan Blvd Timişoara Romania

ISBN: (纸本)9781605585635

There are several research directions in Software Performance engineering (SPE), covering the entire performance prediction process, but most of the tools developed so far implement only part of it or have restrictions. From a methodology perspective, current performance prediction tools rely either on analytical or simulation models, as separate techniques. This paper presents a performance analysis tool, Phymss (Performace Hybrid Model Solver and Simulator), which covers the analysis process from the input system model annotated with performance information to obtaining performance results and inserting them back into the original system model. Two analysis methods are implemented, for flexibility reasons: a multithreaded simulator and a hybrid solver that combines the analytical and simulation approaches in a new analysis technique, in order to investigate the benefits of such an approach. © 2009 ACM.

关键词： Simulators

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