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2008 IEEE/PES Transmission & Distribution Conference & Exposition, part 2

作者： Bach Quoc Khanh Dong-Jun Won Seung-Il Moon Electric Power System Department Electricity Faculty Hanoi University of Technology Hanoi Vietnam School of Electrical Engineering INHA University Incheon South Korea School of Electrical Engineering and Computer Science Seoul National University Seoul South Korea

This paper presents a new method on fault distribution modeling for stochastic prediction study of voltage sags in the distribution system. Two-dimensional stochastic models for fault modeling make it possible to obtain the fault performance for the whole system of interest, which helps obtaining not only sag performance at individual locations but also system sag performance through system indices of voltage sag. By using bivariate normal distribution for fault distribution modeling, the paper estimates the influence of model parameters on system voltage sag performance. The paper also develops the modified SARFI{sub}X regarding phase loads that creates better estimation for voltage sag performance for distribution system.

关键词： Distribution system Power quality Voltage sag frequency Stochastic prediction Fault distribution modeling Bivariate normal distribution Phase loads

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Parallel algorithm for finding the minimum edges to make a disconnected directed acyclic graph strongly connected

Parallel algorithm for finding the minimum edges to make a d...

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2nd International Conference on Innovative Computing, Information and Control, ICICIC 2007

作者： Itokawa, Tsuyoshi Tada, Akio Migita, Masahiro Computer Science and Electrical Engineering Graduate School of Science and Technology Kumamoto University Department of Computer System Technology Faculty of Computer and Information Sciences Sojo University Center for Multimedia and Information Technologies Kumamoto University

ISBN: (纸本)0769528821

A problem to make a graph strongly connected is one of the most fundamental problems in graph theory. The known parallel algorithm[1] solves this problem in O(log n) time using O(n3) processors on a CRCW PRAM model. In this paper we present a parallel algorithm to find the minimum edges to make a disconnected directed acyclic graph strongly connected in O (log(m + n)) time using O(m + n) processors on a CREW PRAM model. This algorithm is an efficient parallel algorithm because the number of processors varies according to the density of the given graph. © 2007 IEEE.

关键词： Parallel algorithms

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Energy-saving coil excitation of electromagnetic levitation system using divided iron core type hybrid magnet

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IEEJ Transactions on Industry Applications 2007年第9期127卷 935-941+2页

作者： Kakinoki, Toshio Yamaguchi, Hitoshi Sinohara, Katsuji Department of Computer System Technology Faculty of Computer and Information Sciences Sojo University 4-22-1 Ikeda Kumamoto 860-0082 Department of Electrical and Electronics Engineering Kagoshima University 1-21-40 kourimoto Kagoshima 890-0065 Sojo University Kagoshima University

Energy saving control is desirable for magnetically levitated (MAGLEV) vehicles. Hybrid magnets controlled with zero power control system was able to reduce the exciting power. But such a conventional system needed to feed bipolar current and then the excitation system was complicated. To achieve a simple excitation system, a hybrid magnet with permanent magnets and divided cores was made. The magnet was a salient-pole type magnet and the poles were placed in two rows. Each pole of the iron cores was equipped with a coil to control both levitation force and lateral damping force. The coils of one side of the divided core were excited with a direct current driver so as to produce the same polarity as the permanent magnet and the others were excited the opposite polarity. The two sets of the coils were excited with direct current drivers each of which had one IGBT. The system needed only two IGBTs per magnet while the conventional zero power systems needed four IGBTs per magnet. According to our test results, the energy consumption was very small and the levitation part was able to start levitating from both upper and lower touch-down positions. In this paper, the characteristics of the proposed excitation system are shown.

关键词： Electric vehicles

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Forecasting time series data using hybrid grey relational artificial neural network and auto regressive integrated moving average model

Forecasting time series data using hybrid grey relational ar...

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作者： Sallehuddin, Roselina Shamsuddin, Siti Mariyam Hj. Hashim, Siti Zaiton Mohd. Abraham, Ajith Faculty of Computer Science and Information System University Technology Malaysia 81310 Skudai Johor Centre for Quantifiable Quality of Service Norwegian University of Science and Technology Norway

In business, industry and government agencies, anticipating future behavior that involves many critical variables for nation wealth creation is vitally important, thus the necessity to make precise decision by the policy makers is really essential. Consequently, an accurate and reliable forecast system is needed to compose such predictions. Accordingly, the aim of this research is to develop a new hybrid model by combining a linear and nonlinear model for forecasting time series data. The proposed model (GRANN_ARIMA) integrates nonlinear Grey Relational Artificial Neural Network (GRANN) and linear ARIMA model, combining new features such as multivariate time series data as well as grey relational analysis to select the appropriate inputs and hybridization succession. To validate the performance of the proposed model, small and large scale data sets are used. The forecasting performance was compared with several models, and these include: individual models (ARIMA, Multiple Regression, Grey Relational Artificial Neural Network), several hybrid models (MARMA, MR_ANN, ARIMA_ANN), and Artificial Neural Network (ANN) trained using Levenberg Marquardt algorithm. The experiments have shown that the proposed model has outperformed other models with 99.5% forecasting accuracy for small-scale data and 99.84% for large-scale data. The empirical results obtained have proved that the GRANN_ARIMA model can provide a better alternative for time series forecasting due to its promising performance and capability in handling time series data for both small and large scale data. © ICS AS CR 2007.

关键词： Neural networks

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Unit commitment by selective self-adaptive ACO with relativity pheromone updating approach

Unit commitment by selective self-adaptive ACO with relativi...

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IPEC 2007 Meeting

作者： Chusanapiputt, Songsak Nualhong, Dulyatat Jantarang, Sujate Phoomvuthisarn, Sukumvit Department of Electrical Power Engineering Faculty of Engineering Mahanakorn University of Technology Thailand Electrical Engineer Department Electrical and Control System Engineering Division Electricity Generating Authority of Thailand (EGAT) Department of Computer Engineering Faculty of Engineering Mahanakorn University of Technology Thailand Center of Excellence in Electrical Power Technology Faculty of Engineering Chulalongkorn University Thailand IEEE

ISBN: (纸本)9789810594237

This paper presents a novel approach to solve the constrained unit commitment problem using the Selective Self-Adaptive Ant Colony Optimization (SSACO) for improving search performance by automatically adapting ant populations and their transition probability parameters, which cooperates with the Candidate Path Management Module (CPMM) and the Effective Repairing Heuristic Module (ERHM) in reducing search space and recovering a feasible optimality region so that a high quality solution can be acquired in a very early iterative. A new concept of the Relativity Pheromone Updating (RPU) is also introduced to provide a reasonable evaluation of the pheromone trail intensity among the agents. The proposed SSACO method not only enhances the convergence of search process, but also provides a suitable number of the population sharing which conducts a good guidance for trading-off between the importance of the visibility and the pheromone trail intensity. The proposed method has been performed on a test system up to 100 generating units with a scheduling time horizon of 24 hours. The numerical results show the most economical saving in the total operating cost when compared to the previous literature results. Moreover, the proposed SSACO topology can remarkably speed up the computational time of ant colony optimization, which is favorable for a large-scale UC problem implementation.

关键词： Ant Colony Optimization unit commitment problem optimization method

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Protecting the exchange of medical images in healthcare process integration with Web services

Protecting the exchange of medical images in healthcare proc...

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40th Annual Hawaii International Conference on system Sciences 2007, HICSS'07

作者： Chiu, Dickson K.W. Hung, Patrick C.K. Cheng, Vivying S.Y. Kafeza, Eleanna IEEE Dickson Computer System 7A Victory Avenue Kowloon Hong Kong Faculty of Business and Information Technology University of Ontario Institute of Technology Canada Department of Computer Science and Engineering Hong Kong University of Science and Technology Department of Marketing and Communications Athens University of Economics and Business

ISBN: (纸本)0769527558

There is now an increasing demand for sharing images and image data for process integration among healthcare institutions. Web services technology has recently been widely proposed and gradually adopted as a platform for supporting integrations. The Health Insurance Portability and Accountability Act (HIPAA) imposes rules as national standards to protect individuals' health information in the U.S., highlighting security and privacy protection requirements. There are so far no holistic solutions to tackle the various protection issues in this area, especially in inter-institutional healthcare progress integration. We propose the exchange of medical images through a Medical Image Exchange Platform (MIEP), especially replacing ad-hoc and manual exchange practices. We show how contemporary technologies of Web services and watermarking can help archive images with layered implementation architecture. Through dedicated Web services technologies with watermarking mechanism, not only can the development, deployment, and maintenance of software be streamlined, the privacy protection in medical image exchanges as required by disparate processes can also be much facilitated. © 2007 IEEE.

关键词： Medical imaging

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Environment exploration using mini-robot Khepera

Environment exploration using mini-robot Khepera

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4th International Symposium on Autonomous Minirobots for Research and Edutainment, AMiRE 2007

作者： Amin, S. Tanoto, A. Witkowski, U. Rückert, U. Abdel-Wahab, M.S. System and Circuit Technology Heinz Nixdorf Institute Paderborn University Fuerstenallee 11 D-33102 Paderborn Germany Faculty of Computer and Information Sciences Ain Shams University Cairo Egypt

This paper presents some results in the implementation of a local navigation strategy for environment exploration using real robots. As an experimental platform we used the mini-robot Khepera II running in the Tele-workbench. The complete environment is divided into small quadratic patches with some objects placed in it. With on-board infrared sensors and wheel encoder, the robot can successfully explore the unknown environment. Moreover, by calculating the distance of surrounding patches, the implemented algorithm will minimize the distance traveled, and in turn of consumed energy and time. This paper also shows the advantage of using the Teleworkbench for performing experiments using real robots.

关键词： Infrared detectors

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The importance ranking of trust attributes in e-Commerce website

The importance ranking of trust attributes in e-Commerce web...

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11th Pacific Asia Conference on Information systems: Managing Diversity in Digital Enterprises, PACIS 2007

作者： Che Hussin, Ab. Razak MacAulay, Linda Keeling, Kathy Faculty of Computer Science and Information System Uni. Technology of Malaysia Malaysia School of Informatics University of Manchester United Kingdom Manchester Business School University of Manchester United Kingdom

The process of building consumer trust in e-Commerce is based on the presence of trust features or trust attributes in the websites. Trust attributes are usually presented to the consumer by some clues on the homepage. For example, the clue 'contact us' will be linked to the trust attribute 'company address'. Consumers may examine e-Commerce websites for the existence of trust attributes. However, to date, which trust attributes contribute to the website's trustworthiness and which trust attributes give more value to consumers has not been adequately explored. Therefore, the purpose of the paper is: (1) to look for relevant trust attributes that should be placed in e-Commerce websites and (2) to identify the importance ranking of trust attributes that contribute to the trustworthiness of e-Commerce website. Five e-Commerce trust models were used for deriving the trust attributes. An online survey that received 1230 respondents was carried out to investigate the importance ranking of important trust attributes. This paper contributes to the discussion on how to build trust in e-Commerce for various stakeholders that include consumers, business organizations, system developers, and also to the researchers.

关键词： Web Design

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Translocation and insertion of an amphiphilic polymer

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Physical Review E 2007年第1期76卷 011801-011801页

作者： Satoshi Tsuchiya Akihiko Matsuyama []Department of Bioscience and Bioinformatics Faculty of Computer Science and System Engineering Kyushu Institute of Technology Kawazu 680-4 Iizuka Fukuoka 820-8502 Japan

Translocation of amphiphilic polymers (random and block copolymers), consisting of hydrophilic and hydrophobic monomers, threading a pore is studied by using a three-dimensional dynamic Monte Carlo simulation. We find that there is a “translocation-insertion” threshold in the fraction of hydrophobic monomers on an amphiphilic polymer. The translocation time is given by simple scaling laws and increases with increasing the fraction of hydrophobic monomers.

关键词： MONTE-CARLO PHASE-TRANSITIONS MEMBRANE NANOPORE PORE SIMULATIONS ADSORPTION HOLE PROTEINS BEHAVIOR

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Deciding to adopt requirements traceability in practice

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19th International Conference on Advanced Information systems Engineering

作者： Blaauboer, Floris Sikkel, Klaas Aydin, Mehmet N. Accenture System Integration and Technology Netherlands University of Twente Faculty of Electrical Engineering Mathematics and Computer Science 7500 AE Enschede PO Box 217 Netherlands University of Twente School of Management and Governance 7500 AE Enschede PO Box 217 Netherlands

ISBN: (纸本)9783540729877

The use of requirements traceability for information systems development (ISD) projects is not very common in practice despite its often mentioned advantages in the literature. We conducted a case study in a large IT company to identify the factors that are relevant for the decision whether or not to adopt traceability in an ISD project. Five dominant factors emerged: development organization awareness, customer awareness, return on investment, stakeholder preferences, and process flow. It turned out that the majority of the software development project leaders we interviewed were not aware of the concept of traceability - with the obvious result that using traceability in software project is not even considered. This fact has possibly been underestimated in the present literature of requirements engineering.

关键词： requirements traceability decision-making requirements engineering

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