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IEEE PES Transmission and Distribution Conference and Exposition

作者： E. Akhavan-Rezai M.-R. Haghifam A. Fereidunian Department of Electrical Engineering Islamic Azad University Faculty of Electrical and Computer Engineering Tarbiat Modares University Electrical Eng Dep. Power and Water University of Technology (PWUT)

ISBN: (纸本)9781424465460

Electric power utilities develop asset management (AM) strategies, based upon their reliability studies, which provide brighter images of the utility company's performance. Failure rate models are highly instrumental in transforming from simple reliability analyses into effective AM strategies. This paper proposes an adaptive network-based inference approach, to model momentary failure rate, in terms of the most influential factors. These factors are achieved through the vast field studies and historical outage fault statistics of the Greater Tehran Electricity Distribution Company (GTEDC) network. Performance of the presented failure rate model is tested, and discussions on capabilities of the model are then presented in detail.

关键词： Power distribution systems Failure rate modeling Fault statistics Asset management (AM) Reliability evaluation Fuzzy systems Adaptive network-based fuzzy inference systems (ANFIS) Data mining Feature selection

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Carbon footprints analysis for tunnel construction processes in the preplanning phase using collaborative simulation

Carbon footprints analysis for tunnel construction processes...

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Construction Research Congress 2010: Innovation for Reshaping Construction Practice

作者： Ahn, Changbum Xie, Hua Lee, Sang Hyun Abourizk, Simaan Peña-Mora, Feniosky Construction Management and Information Technology Groups Department of Civil and Environmental Engineering University of Illinois at Urbana- Champaign 205 N. Mathews Ave. Urbana IL 61801 United States The Hole School of Construction Engineering Dep. of Civil and Environmental Engineering University of Alberta Edmonton AB T6G 2W2 Canada Fu Foundation School of Engineering and Applied Science Dept. of Civ. Eng. and Eng. Mechanics Earth and Environmental Engineering and Computer Science Columbia University 500 W. 120th St. New York NY 10027 United States

ISBN: (纸本)9780784411094

Under the fast-developing carbon trading market, the construction industry needs to mitigate carbon emissions from construction processes. Among various construction processes, tunnel construction produces a significant amount of carbon emissions, since it utilizes various types of high energy-consuming equipment. In order to identify and mitigate such carbon emissions of a tunneling project, it is required to reliably estimate carbon footprints of a tunneling project in the pre-planning phase. This paper presents the methodology for estimating the carbon footprints generated during tunnel construction processes using the collaborative tunneling simulation. A case study using this methodology shows that carbon footprints from a utility tunnel construction are significant compared with those from a building construction. In addition, the assessment of carbon footprints of the case study identifies the opportunities to mitigate such impact by supporting decision-making on equipment and operation plans in the planning phase and providing a control target level of carbon footprints in the execution phase. Copyright ASCE 2010.

关键词： Construction equipment

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A Data Mining Approach Based on a Local-Global Fuzzy Modelling for Prediction of Color Change after Tooth Bleaching Using Vita Classical Shades

A Data Mining Approach Based on a Local-Global Fuzzy Modelli...

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International Conference on Intelligent Systems Design and Applications (ISDA)

作者： L.J. Herrera M.M. Pérez J. Santana R. Pulgar J. González H. Pomares I. Rojas Dep. Computer Architecture and Technology University of Granada Spain Dep. Optics University of Granada Spain Dep. Odontology University of Granada Spain Dep. Computer Architecture and Technology University of Granada

Tooth bleaching is receiving an increasing interest by patients and dentists since it is a relatively non-invasive approach for whitening and lightening teeth. Instrument designed for tooth color measurements and visual assessment with commercial shade guides are nowadays used to evaluate the tooth color. However, the degree of color change after tooth bleaching varied substantially among studies and currently, there are no objective guidelines to predict the effectiveness of a tooth bleaching treatment. Fuzzy logic is a well known paradigm for data modelling; their main advantage is their ability to provide an interpretable set of rules that can be later used by the scientists. However these models have the problem that the global approximation optimization can lead to a deficient rule local modelling. This work proposes a modified fuzzy model that performs a simultaneous global and local modelling. This property is reached thanks to a special partitioning of the input space in the fuzzy system. The proposed approach is used to approximate a set of color measurements taken after a bleaching treatment using the pre-bleaching measurements. The system uses as rule antecedents the colorimetric values of the VITA commercial shade guide. The expected post-bleaching colorimetric values are immediately obtained from the local models (rules) of the system thanks to the proposed modified fuzzy model. Additionally, these post-bleaching CIELAB coordinate values have been associated with VITA shades through the evaluation of their respective membership functions, approximating which VITA shades are expected after the treatment for each pre-bleaching VITA shade.

关键词： Data mining Predictive models Teeth Bleaching Fuzzy systems Instruments Dentistry Guidelines Fuzzy logic Medical treatment

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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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Analysis of power system QV curve by fuzzy modeling

Analysis of power system QV curve by fuzzy modeling

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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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Finding long and similar parts of trajectories 09

Finding long and similar parts of trajectories

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17th ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems, ACM SIGSPATIAL GIS 2009

作者： Buchin, Kevin Buchin, Maike Van Kreveld, Marc Luo, Jun Dep. of Mathematics and Computer Science TU Eindhoven Netherlands Dep. of Information and Computing Sciences Utrecht University Netherlands Shenzhen Institute of Advanced Technology Chinese Academy of Sciences China

ISBN: (纸本)9781605586496

A natural time-dep.ndent similarity measure for two trajectories is their average distance at corresponding times. We give algorithms for computing the most similar subtrajectories under this measure, assuming the two trajectories are given as two polygonal, possibly self-intersecting lines. When a minimum duration is specified for the subtrajectories, and they must start at exactly corresponding times in the input trajectories, we give a linear-time algorithm for computing the starting time and duration of the most similar subtrajectories. The algorithm is based on a result of indep.ndent interest: We present a linear-time algorithm to find, for a piece-wise monotone function, an interval of at least a given length that has minimum average value. When the two subtrajectories can start at different times in the two input trajectories, it appears difficult to give an exact algorithm for the most similar subtrajectories problem, even if the duration of the desired two subtrajectories is fixed to some length. We show that the problem can be solved approximately, and with a performance guarantee. More precisely, we present (1 + Ε)-approximation algorithms for computing the most similar subtrajectories of two input trajectories for the case where the duration is specified, and also for the case where only a minimum on the duration is specified. © 2009 ACM.

关键词： Trajectories

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To investigate the sucess and failure factors of ERP implementation within malaysian small and medium enterprises

To investigate the sucess and failure factors of ERP impleme...

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2009 International Conference on Information Management and Engineering, ICIME 2009

作者： Noudoostbeni, Ali Yasin, Norizan Mohd Jenatabadi, Hashem Salarzadeh Dep. Information Science Faculty of computer Science and Information Technology University Malaya Kuala Lumpur Malaysia Dep. Applied Statistics Faculty of Economics and Administration University Malaya Kuala Lumpur Malaysia

ISBN: (纸本)9780769535951

in recent years ERP, as a comprehensive new system, has been used by many Malaysian companies. It has been successful in some and in some others it has failed. This article assesses 15 success factors and 8 failure factors in SME companies and tries to recognize the effective ones. The results show that the two most important failure factors in implementing ERP in Malaysian SMEs are 'poor planning or poor management ' and 'inappropriate training methods' and the most important success factors are ' Implementing team's teamwork and composition' and ' Effective training of users'. It could be conducted that team work is a key success factor in Malaysian SMEs and also training is of vital importance. As a result, by a sound investment and effective trainings we may guarantee the success of ERP in SMEs in Malaysia, failure to do so will lead to a defeat for ERP in Malaysian setting. 2009 IEEE.

关键词： Enterprise resource planning

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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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Flip Graphs of Bounded-Degree Triangulations

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Electronic Notes in Discrete Mathematics 2009年 34卷 509-513页

作者： Aichholzer, O. Hackl, T. Orden, D. Ramos, P. Rote, G. Schulz, A. Speckmann, B. Institute for Software Technology TU Graz Austria Dep. de Matemáticas Univ. de Alcalá Spain Institut für Informatik Freie Universität Berlin Germany Computer Science Department Smith College United States Dep. of Math. and Computer Science TU Eindhoven Netherlands

We study flip graphs of triangulations whose maximum vertex degree is bounded by a constant k. Specifically, we consider triangulations of sets of n points in convex position in the plane and prove that their flip graph is connected if and only if k > 6;the diameter of the flip graph is O (n ²). We also show that for general point sets, flip graphs of triangulations with degree ≤k can be disconnected for any k. © 2009 Elsevier B.V. All rights reserved.

关键词： degree bound flip graph flipping distance triangulation

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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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