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ICROS-SICE International Joint Conference 2009, ICCAS-SICE 2009

作者： Wang, Shu-Chen Wu, Chi-Jui Huang, Pei-Hwa Dep. of Computer and Communication Engineering Taipei College of Maritime Technology Taipei Taiwan Dep. of Electrical Engineering National Taiwan University of Science and Technology Taipei Taiwan Dep. of Electrical Engineering National Taiwan Ocean University Keelung Taiwan

ISBN: (纸本)9784907764333

Voltage instability of power system comes from increasing load rapidly, and causes bus voltage to drop. When voltage is out of control and it can be voltage collapse. This paper presents the fuzzy modeling approach to the description QV curve of power system for analysis of voltage stability. The QV curve can identify voltage stability limit, and it determine robustness of power system. The fuzzy system model is basically a collection of fuzzy IF-THEN rules that are combined via fuzzy reasoning for describing the features of a system under study. The method of fuzzy modeling has been proven to be well-suited for modeling nonlinear industrial processes described by input-output data. In view of the nonlinear characteristic of the QV curve, the method of fuzzy modeling is employed for representing the curve. Based on the Sugeno-type fuzzy model, various models with different numbers of modeling rules are used to describing the QV curve. It is found that such fuzzy model offers both quantitative and qualitative descriptions for the QV curve. © 2009 SICE.

关键词： Electric power system stability

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Configuration of a SIP signaling network: An experimental analysis

Configuration of a SIP signaling network: An experimental an...

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NCM 2009 - 5th International Joint Conference on Int. Conf. on Networked Computing, Int. Conf. on Advanced Information Management and Service, and Int. Conf. on Digital Content, Multimedia technology and its Applications

作者： Homayouni, Maryam Azhari, Sayed Vahid Jahanbakhsh, Mojataba Akbari, Ahmad Mansoori, Alireza Amani, Nahid IT Lab. Dep. of Computer Engineering Iran University of Science and Technology Tehran Iran CT Research Dep. Iran Telecommunication Research Center Tehran Iran

ISBN: (纸本)9780769537696

Session Initiation Protocol (SIP) [1] is adopted as the main signaling protocol for the IP Multimedia Subsystem (IMS). Large dep.oyment of SIP servers in Next Generation Networks (NGN) requires studying the behavior and performance of SIP servers under both normal and overload conditions, which may happen in such networks with a vast number of users. In this paper a measurement-based study is performed to assess SIP proxy server performance under different configurations, and for different underlying transport protocols, for both inter-domain and intra-domain calls. Test results show the effectiveness of configuration and distance on SIP signaling performance. Therefore a great attention must be paid during SIP servers dep.oyment. © 2009 IEEE.

关键词： Next generation networks

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Solving the capacitated vehicle routing problem with maximum traveling distance and service time requirements: An approach based on Monte Carlo simulation

Solving the capacitated vehicle routing problem with maximum...

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2009 Winter Simulation Conference, WSC 2009

作者： Juan, Angel A. Adelantado, Ferran Faulin, Javier Grasman, Scott E. Montoya-Torres, Jairo R. Dep. of Computer Science and Telecommunication Open University of Catalonia Barcelona 08018 Spain Dep. of Statistics and Operations Research Public University of Navarre Pamplona 31006 Spain Dep. of Engineering Management Missouri University of Science and Technology Rolla MO 65409-0370 United States Colombia

ISBN: (纸本)9781424457700

This paper presents an approach based on Monte Carlo Simulation (MCS) to solve the Capacitated Vehicle Routing Problem (CVRP) with maximum traveling distance per route and additional costs per service, which introduces additional challenges to the classical CVRP. The basic idea behind our approach is to combine direct MCS with an efficient heuristics -e.g. the Clarke and Wright Savings (CWS) algorithm- and a divide-and-conquer technique. The CWS heuristics provides a constructive methodology which is improved in two ways: (i) a special random behavior is introduced in the methodology -in this case, a geometric distribution is used for this purpose;and (ii) a divide-and-conquer technique is used to decompose the original problem in smaller sub-problems that are easy to deal with. Our approach is then validated using a set of well-known benchmarks. Finally, the paper discusses some advantages and disadvantages of our approach with respect other existing approaches. ©2009 IEEE.

关键词： Monte Carlo methods

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Development of a functional model for a 3D scanner 26

Development of a functional model for a 3D scanner

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26th Danubia-Adria Symposium on Advances in Experimental Mechanics

作者： Ilarionov, Rajcho Technical University of Gabrovo Faculty of Electrical Engineering Dep. Computer Systems and Technology H. Dimitar-Str 4 Gabrovo Bulgaria

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An MIH-assisted handoff mechanism for concurrent multipath transfer in wireless multihomed networks

An MIH-assisted handoff mechanism for concurrent multipath t...

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2009 IEEE 20th Personal, Indoor and Mobile Radio Communications Symposium, PIMRC 2009

作者： Huang, Chung-Ming Lin, Ming-Sian Chang, Lik-Hou Chang, Wen-Yao Lab. of Multimedia Mobile Networking Dep. of Computer Science and Information Engineering National Cheng Kung University Tainan Taiwan Emerging Smart Technology Institute Institute for Information Industry Taipei Taiwan

ISBN: (纸本)9781424451234

As more and more devices are equipped with multiple network interfaces, the multihomed technology is becoming an important technology that can provide more reliable connections against the network failure and better data transmission rate. Concurrent Multipath Transfer (CMT), which is based on SCTP, is devised for multihomed networks. CMT can transmit data over all paths to maximum the data transmission speed. One of the main concerns of CMT is the receiver buffer blocking issue, especially in multihomed wireless mobile networks. If the receiver buffer is blocked, the sender can send only one packet to the receiver. The receiver buffer blocking is mainly caused by the lost data. For small memory devices, e.g., PDA, smart phone and embedded systems, the receiver buffer is limited and has less free space to prevent receiver buffer blocking. In this paper, we proposed Media Indep.ndent Handover - Concurrent Multipath Transfer (MIH-CMT) over wireless networks to deal with the receiver buffer blocking caused by handoff loss. MIH-CMT can reduce the amount of packet loss during handoff, which may lead to the receiver buffer blocking. Simulation results show that MIH-CMT can reduce the effect of the receiver buffer blocking effectively for devices that have smaller buffer size. ©2009 IEEE.

关键词： Wireless networks

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Applying FPGA-based chip to apparent power and power factor measurement considering nonsinusoidal and unbalanced conditions

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WSEAS Transactions on Circuits and Systems 2009年第7期8卷 559-568页

作者： Wang, Shu-Chen Wu, Chi-Jui Yang, Sheng-Wen Department of Computer and Communication Engineering Taipei College of Maritime Technology Taipei Taiwan Dep. of Electrical Engineering National Taiwan University of Science and Technology Taipei Taiwan

This paper proposes a field-programmable gate array (FPGA)-based integrated circuit (IC) for computing apparent powers and power factors of power systems. In a nonsinusoidal and unbalanced three-phase power system, the calculation of apparent powers and power factors has many definitions. Load characteristics of harmonic and unbalance can not be expressed in the traditional apparent power and power factor, which only consider the fundamental and three-phase balanced sinusoidal conditions. This paper utilizes the FPGA chip to develop the platform to implement the calculation methods of apparent powers and power factors. The proposed design scheme is developed using the very high speed integrated-circuit hardware description language (VHDL), which provides high flexibility and technology indep.ndence. This paper discussed the effective power and power factor, the arithmetic power and power factor, and the fundamental power and power factor. The design of filters for the computation of fundamental frequency components is given. ModelSim is used at first to simulate the calculation of apparent powers and power factors to ensure the accuracy of timing and function. Research results show that the designed chip can compute accurately the apparent powers and power factors considering the effects of nonsinusoidal and unbalanced conditions.

关键词： System-on-chip

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Methods for fem analysis of riveted joints of thin-walled aircraft structures within the imperja project

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25th Symposium of the International Committee on Aeronautical Fatigue: Bridging the Gap between Theory and Operational Practice, ICAF 2009

作者： Kaniowski, Jerzy Wronicz, Wojciech Jachimowicz, Jerzy Szymczyk, Elzbieta Institute of Aviation Al. Krakowska 110/114 02-256 Warsaw Poland Dep. of Mechanics and Applied Computer Science Faculty of Mechanical Engineering Military University of Technology 2 Kaliskiego Street 00-908 Warsaw Poland

ISBN: (纸本)9789048127450

The paper deals with the modelling of riveted joints in aircraft structures with Finite Element Method. Presented works were carried out within Eureka project No. E!3496 called IMPERJA. The goal of the IMPERJA project is to increase the fatigue life of riveted joints, which will lead to an increase of the aircraft service life, a smaller number of inspections and lower operation costs of an aircraft. The project assumed FEM modelling of the operating aircraft's structure at three different complexity levels, namely considering the complete structure, a structural detail and a single riveted joint. The paper presents analyses of various rivet models and calculations of a structure and a riveted joint. In the first part examples of various models, at global and local level, were presented and usefulness of them was discussed, influence of the following simplification was analysed;• neglection of rivets in a model (elements are jointed continuously) • rivet as a rigid element (MPC) • neglection of contact phenomenon • neglection of secondary bending • neglection of residual stresses after riveting process The basis of the analysis was the asymmetric butt joint model with 14 rivets. The model which took into account secondary bending and contact phenomenon was analysed as well. The method of modelling residual stresses with temperature and thermal coefficient was used. In the second part, the example of analysis of riveted joint was demonstrated for a wing of PZL M28 Skytruck aircraft. It's is a twin-engine, high-wing, cantilever monoplane of all-metal structure with maximum take-off and landing weight 7500 kg. A submodeling technique was used there. At first, part of the wing model, based on a CAD model, was built. It includes 7 ribs and 6 bulkheads between them. Dimensions of the model eliminate stress perturbation, connected with boundary conditions, in the area near the middle rib. It was a shell model. The boundary conditions were taken on a basis of operation data

关键词： Boundary conditions

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Analytic modeling and metaheuristic PID control of a neutral time delay test case central heating system

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WSEAS Transactions on Systems and Control 2008年第11期3卷 967-981页

作者： Koumboulis, Fotis N. Kouvakas, Nikolaos D. Paraskevopoulos, Paraskevas N. Dep. of Automation Halkis Institute of Technology 34400 Psahna Evoia Greece Dep. of Electrical and Computer Engineering National Technical University of Athens 15780 Zographou Athens Greece

In the present paper, the analytic mathematical model of a test case central heating system is developed in the form of a nonlinear neutral time delay model with time varying delay which in turn is simplified to a neutral time delay model with constant time delay. In the process it is shown that the influence of the delay is significant, thus its incorporation to the model is of high importance while the constant delay approximation imposes only small error. A PID controller is derived to control the temperature of a room, which is modeled as a first order differential equation. The controller parameters are evaluated using a metaheuristic algorithm.

关键词： Three term control systems

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Lazy instruction scheduling: Keeping performance, reducing power

Lazy instruction scheduling: Keeping performance, reducing p...

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ISLPED'08: 13th ACM/IEEE International Symposium on Low Power Electronics and Design

作者： Mahjur, Ali Taghizadeh, Mahmoud Jahangir, Amir Hossein Dep. of Electrical and Computer Engineering Shahid Beheshti University Tehran Iran Dept. of Computer Engineering Sharif University of Technology Tehran 11155-9517 Iran Dept. of Computer Engineering Sharif University of Technology Tehran 11155-9517 Iran

ISBN: (纸本)9781605581095

An important approach to reduce power dissipation is reducing the number of instructions executed by the processor. To achieve this goal, this paper introduces a novel instruction scheduling algorithm that executes an instruction only when its result is required by another instruction. In this manner, it not only does not execute useless instructions, but also reduces the number of instructions executed after a mispredicted branch. The cost of the extra hardware is 161 bytes for 128 instruction window size. Measurements done using SPEC CPU 2000 benchmarks show that the average number of executed instructions is reduced by 13.5% while the average IPC is not affected. Copyright 2008 ACM.

关键词： Scheduling algorithms

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Lazy instruction scheduling: keeping performance, reducing power

Lazy instruction scheduling: keeping performance, reducing p...

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International Symposium on Low Power Electronics and Design (ISLPED)

作者： Ali Mahjur Mahmud Taghizadeh Amir Hossein Jahangir Dep. of Electrical and Computer Engineering Shahid Beheshti University Tehran Iran Dept. of Computer Engineering Sharif University of Technology Tehran Iran

关键词： Power dissipation Scheduling algorithm Pipelines computer aided instruction Power engineering computing Power engineering and energy Hardware Processor scheduling Yarn Permission

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