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Access control system: Monitoring tool for fiber to the home passive optical network

World Academy of Science, engineering and Technology 2009年 38卷 45-50页

作者： Premadi, A. Rahman, Mohammad Syuhaimi Ab. Saupe, Mohamad Najib Moh. Jumari, Kasmiran Computer and Network Security Research Group Dept. of Electrical Electronic Systems Engineering University Kebangsaan Malaysia 43600 UKM Bangi Selangor Malaysia

An optical fault monitoring in FTTH-PON using ACS is demonstrated. This device can achieve real-time fault monitoring for protection feeder fiber. In addition, the ACS can distinguish optical fiber fault from the transmission services to other customers in the FTTH-PON. It is essential to use a wavelength different from the triple-play services operating wavelengths for failure detection. ACS is using the operating wavelength 1625 nm for monitoring and failure detection control. Our solution works on a standard local area network (LAN) using a specially designed hardware interfaced with a microcontroller integrated Ethernet. © 2009 ***.

关键词： Fiber to the x

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Optimization based synthesis of state derivative feedback controllers for retarded systems

Optimization based synthesis of state derivative feedback co...

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作者： McGahan, Paul Vyhlídal, Tomáš Michiels, Wim Dept. of Instrumentation and Control Eng. Faculty of Mechanical Engineering Czech Technical University in Prague Technická 4 166 07 Praha 6 Czech Republic Department of Computer Science Katholieke Universiteit Leuven Celestijnenlaan 200A B-3001 Heverlee Belgium

ISBN: (纸本)9783902661678

The paper presents an optimization based algorithm for stabilizing retarded systems using a state derivative feedback controller. It is shown that an application of such a controller results in neutral dynamics of the closed loop system if small feedback delays occur. Therefore, the strong stability theory of neutral systems needs to be considered in the controller synthesis problem. The stabilization approach is based on minimizing the spectral abscissa of the closed loop system over the controller parameter space, subject to a strong stability constraint. Copyright © 2009 IFAC.

关键词： Time delay

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Neural control of the Wells turbine-generator module

Neural control of the Wells turbine-generator module

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48th IEEE Conference on Decision and control (CDC)

作者： M. Amundarain Ormaza M. Alberdi Goitia A.J. Garrido Hernandez I. Garrido Hernandez University of the Basque Country Dept. Automatic Control and Systems Engineering Plaza de la Casilla 3 48012 Bilbao SPAIN

ISBN: (纸本)9781424438716

Wave energy is one of the most promising forms of ocean renewable sources because of its high availability. The Wells turbine has been one of the defining technologies in the development of wave energy. In this paper a neural control method for the Wells turbine-generator module is presented. For this purpose, a neural control using the backpropagation algorithm has been implemented, based on the addition of external resistances in series with the rotor winding of the induction generator connected to the turbine. The proposed control system does appropriately adapt the rotor resistance according to the pressure drop entry. It will be shown how the controller avoids the stalling behaviour and that the average power of the generator fed into the grid is significantly higher in the controlled case than in the uncontrolled one.

关键词： neuroregulation WELLS Wave energy turbogenerators Backpropagation algorithms Induction generators Rotors (windings) Pressure decline power generator rotor resistance Technology Development average power

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Local vs. wide-area undervoltage load shedding in the presence of induction motor loads

Local vs. wide-area undervoltage load shedding in the presen...

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Power Tech Conference

作者： Bogdan Otomega Thierry Van Cutsem Power Systems Department Politehnica University of Bucharest Romania Power Systems Dept. of the “Politehnica” University of Bucharest Romania Dept. of Electrical Engineering and Computer Science (Montefiore Institute) of the University of Liège Belgium

In the presence of induction motor loads, long-term voltage instability may end up in a sharp voltage decrease, which makes the tuning of undervoltage load shedding more delicate. This paper first investigates the ability of a purely distributed load shedding scheme, previously proposed by the authors, to cope with these situations. Owing to difficulties to reconcile dependability and security, an alternative wide-area protection is considered. The latter consists of generators sending overexcitation signals to the load shedding controllers in order to allow the latter to act faster. Detailed time simulations of a test system are reported.

关键词： Induction motors Protection System testing Induction generators Distributed control Voltage control Power system modeling Voltage fluctuations Security Signal generators

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Deaf, Dumb, and Chatting Asynchronous Robots Enabling Distributed Computation and Fault-Tolerance among Stigmergic Robots

Deaf, Dumb, and Chatting Asynchronous Robots Enabling Distri...

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13th International Conference on Principles of Distributed systems

作者： Dieudonne, Yoann Dolev, Shlomi Petit, Franck Segal, Michael MIS Université of Picardie Jules Verne France Department of Computer Science Ben-Gurion University of the Negev Israel LiP6/CNRS/INRIA-REGAL Université Pierre et Marie Curie - Paris 6 France Communication Systems Engineering Dept. Ben-Gurion University of the Negev Israel

ISBN: (纸本)9783642108761

We investigate avenues for the exchange of information (explicit communication) among deaf and dumb mobile robots scattered in the plane. We introduce the use of movement-signals (analogously to flight signals and bees waggle) as a mean to transfer messages, enabling the use of distributed algorithms among robots. We propose one-to-one deterministic movement protocols that implement explicit communication among asynchronous robots. We first show how the movements of robots can provide implicit acknowledgment in asynchronous systems. We use this result to design one-to-one communication among a pair of robots. Then, we propose two one-to-one communication protocols for any system of n >= 2 robots. The former works for robots equipped with observable IDs that agree on a common direction (sense of direction). The latter enables one-to-one communication assuming robots devoid of any observable IDs or sense of direction. All three protocols (for either two or any number of robots) assume that no robot remains inactive forever. However, they cannot avoid that the robots move either away or closer of each others, by the way requiring robots with an infinite visibility. In this paper, we also present how to overcome these two disadvantages. These protocols enable the use of distributing algorithms based on message exchanges among swarms of Stigmergic robots. They also allow robots to be equipped with the means of communication to tolerate faults in their communication devices.

关键词： Explicit Communication Mobile Robot Networks Stigmergy

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Providing assistance during decision-making problems solving in an educational modelling environment

IFIP Advances in Information and Communication Technology

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IFIP Advances in Information and Communication Technology 2009年 296卷 21-22页

作者： Politis, Panagiotis Partsakoulakis, Ioannis Vouros, George Fidas, Christos Dept. Of Primary Education University of Thessaly Volos38221 Greece Dept. Of Information and Communication Systems Engineering University of the Aegean Samos83200 Greece Dept. Of Electrical and Computer Engineering University of Patras Rio Patras26500 Greece

In this paper we present the model-checking module of decision-making models in the frame of ModelsCreator, an educational modelling environment. The model-checking module aims to assist young students to construct qualitative models for decision-making problems solving. We specify the decision-making models that may be built and we explain the model checking mechanism. The model-checking mechanism compares the student model with the reference model constructed by the teacher and provides immediate advice to the student to help him create a valid model. So, the model-checking module of a decision-making model aims to facilitate student to structure convincing decisions in the proper situations. © 2009, IFIP International Federation for Information Processing. All rights reserved.

关键词： Model checking

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Guaranteed Cost control For Constrained Takagi-Sugeno Fuzzy systems

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IFAC Proceedings Volumes 2009年第19期42卷 325-330页

作者： Carlos Ariño Emilio Pérez Antonio Sala Department of Industrial Systems Engineering and Design Universitat Jaume I Avenida Vicent Sos Baynat s/n. 12071 Castelló de la Plana Spain Dept. of Systems Engineering & Control at the Technical University of Valencia E-46022 Valencia Spain

Abstract This paper presents a novel control design technique in order to obtain a Guaranteed Cost Fuzzy controller subject to constraints on the input channel. This Guaranteed cost control law is obtained via multi-parametric Quadratic Programming. The result is a piecewise fuzzy control law where the state partition is defined by fuzzy inequalities. The parameters of the Lyapunov function can be obtained previously using linear matrix inequalities optimization.

关键词： Takagi-Sugeno fuzzy control LMI quadratic stability parallel distributed compensation piecewise control multi-parametric Quadratic Programming Constrained control

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Learning the Point Gathering Task Using Shared Value Function In Mobile Robots

Learning the Point Gathering Task Using Shared Value Functio...

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International Conference on Advanced computer control, ICACC

作者： Sriram Raghavan S.V. Raghavan Network Systems Laboratory Department of Computer Science and Engineering Indian Institute of Technology Madras India Network Systems Laboratory Dept. of Computer Science and Engg. Indian Institute of Technology Madras

Managing the actions of several agents to perform tasks which require coordination and cooperation pose significant research challenges. One such challenge is to synchronize the agentspsila view of the system to help them take the dasiarightpsila actions. In this paper, we propose an algorithm called MRCPG (Mobile Robot Coordination Point Gathering Algorithm) for coordinating the actions of a team of mobile robots. The aim is to gather these robots at a particular location in a 2-dimensional plane which is determined during execution. The robots are randomly deployed in the plane and they achieve the goal by communicating periodically. In addition, we impose a reinforcement learning framework and the robots learn a shared value function (SVF) based on scalar rewards received. The SVF is used to select the best possible action in each state until at least one robot reaches the goal. Then a reach-distance heuristic is used to direct the remaining robots to the goal. The algorithm was analyzed through simulations for up to 5 robots and the analysis indicates that communication helped robots perform significantly faster than when they acted independently - measured using the path-length of the first robot to reach the goal as the metric. We also observed that increasing team size enhances the effect of communication and hastens task completion.

关键词： Mobile robots Robot kinematics Algorithm design and analysis Performance analysis Intelligent robots Laboratories computer science Inference algorithms Learning Robotic assembly

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Multispectral image fusion using Walidlet transform

Advances in Modelling and Analysis B

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Advances in Modelling and Analysis B 2009年第1-2期52卷 1-20页

作者： Al-Heladi, A.H.M. Mahmmoud, W.A. Hali, H.A. Fadhel, A.F. Software Engineering and Computer Information Systems Dept. Al-Isra Private University P.O.B. 22 Amman 11622 Jordan University of Baghdad College of Engineering Baghdad Iraq

In various mapping and remote sensing applications, fusion technique might be adopted in order to obtain a better understanding of a scene, high spatial/high spectral resolutions images by combining multispectral and panchromatic images is very important issue. Recently, various wavelet-based image fusion techniques were developed to provide high quality of the spectral content in fused image. But, these wavelet-based methods have a drawback in spatial resolution of the fused result In this paper, a new method of image fusion is introduced. The proposed method is based on a Hybrid transform called Walidlet transform (WLT), which is an extensions of Ridge let transform. It uses multiwavelet transform instead of wavelet transform in the final steps of Ridgelet transform. Since edges and noise play a fundamental role in image understanding, hence this Walidlet transform is a good way to enhance the edges and reduce the noise. The proposed method of fusion provides richer information in spatial and spectral domains simultaneously as well as it has reached an optimum fusion result.

关键词： Remote sensing

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Enhancing cooperative behavior for online reputation systems by group selection

Enhancing cooperative behavior for online reputation systems...

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Symposia and Workshops on Ubiquitous, Autonomic and Trusted Computing in Conjunction with the UIC'09 and ATC'09 Conferences, UIC-ATC 2009

作者： Ren, Yizhi Li, Mingchu Cui, Yongrui Guo, Cheng Sakurai, Kouichi School of Software Dalian University of Technology Dalian 116621 China Dept. of Computer Science and Communication Engineering Kyushu University Hakozaki Fukuoka 812-81 Japan Institute of Systems Information Technologies KYUSHU 2-1-22 Momochihama Sawara-ku Fukuoka 814-0001 Japan

ISBN: (纸本)9780769537375

Reputation systems are very useful in large online communities in which users may frequently have the opportunity to interact with users with whom they have no prior experience. Recently, how to enhance the cooperative behaviors in the reputation system that has became to one of the key open issues. Research in the evolutionary game theory shows that the group selection or multilevel selection can favor the cooperation in the finite populations. Furthermore, Nowak et al., in [1], [2] give a fundamental condition for the evolution of cooperation by group *** on the above important result, we extend the group selection concept in evolutionary biology and propose a group-based mechanism to enhance cooperation for online reputation systems. © 2009 IEEE.

关键词： Game theory

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