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International Conference on Behavior, Economic and Social Computing (BESC)

作者： Haobo Wang Guiping Su Yuan Sun Shiwei Ye Pan Liao Yi Sun School of Computer and Control Engineering University of China Academy of Science Beijing China Information and Society Research Division National Institute of Informatics Tokyo Japan

The problem of matrix completion has been gaining increasing attention among the data mining, knowledge discovery and related research communities. Factorization is one approach to solve the problem. There are good factorization methods, such as Singular value decomposition (SVD) and Non-negative matrix factorization (NMF) which could get a rather satisfied results when dealing with real-valued data. However when comes to binary data, we need a different handling strategy. In this paper, we use the Boolean Matrix Factorization (BMF) method based on weighted Frobenius norm to predict the missing values in a binary matrix. Because BMF is an NP-hard problem, we propose a recursive method that updates the rank-one matrix in latent space in each step to maximum the coverage of the known values of the input matrix. To speed up computations, we use a Heaviside step function, which allows us to decompose the recursive computing process into normal non-negative matrices and get the results by mapping them back into a Boolean matrix. The Simulation results from an actual test show that the proposed method outperforms the existing method.

关键词： Manganese

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Speed Profile Optimization for Train Operation Based on Ant Colony Algorithm

Speed Profile Optimization for Train Operation Based on Ant ...

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2015 IEEE Advanced Information Technology,Electronic and Automation control Conference(IAEAC 2015)

作者： Liqian Fan Fang Cao Bworen Ke Tao Tang State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Department of Computer Science and Information Engineering Chung-Chou Institute of Technology

ISBN: (纸本)9781479919819

Automatic train operation(ATO) system generally consists of the generation of recommended speed profile and the speed tracking *** determines the tracked trajectory and the energy consumption of trains during the ***,the optimization of recommended speed profile and the tracking strategy are regarded as two important means to achieve energyefficient train operation between the successive *** considering the ATO tracking strategy,an optimization method of the recommended speed profile is proposed in this *** on the approximate calculation,a discrete combination optimization model is formulated and a new MAX-MIN ant system(MMAS) is taken as the core *** the fixed speed tracking strategy,this method achieves the recommended speed profile with optimized energy consumption and a perfect running punctuality along the actual tracked *** switching times of operation during the cruising phase is reduced by integrating the drivers' experience,which also reduces the energy consumption of train running between *** case results based on Beijing Yizhuang Metro Line in China verify the effectiveness of the proposed method,which has a good performance on energy-efficient train operation.

关键词： Recommended Speed Profile Ant Colony Algorithm ATO Tracking Strategy

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Optimal Microgrid Energy Management Integrating Intermittent Renewable Energy and Stochastic Load

Optimal Microgrid Energy Management Integrating Intermittent...

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2015 IEEE Advanced Information Technology,Electronic and Automation control Conference(IAEAC 2015)

作者： Ying Ji Jianhui Wang Shijie Yan Wenzhong Gao Hepeng Li College of Information Science and Engineering Northeastern University Department of Electrical and Computer Engineering University of Denver Lab.of Networked Control Systems Shenyang Institute of AutomationChinese Academy of Sciences

ISBN: (纸本)9781479919819

In this paper,we focus on energy management of distributed generators(DGs) and energy storage system(ESS) in microgrids(MG) considering uncertainties in renewable energy and load *** MG energy management problem is formulated as a two-stage stochastic programming model based on optimization ***,the optimization model is decomposed into a mixed integer quadratic programming problem by using discrete stochastic scenarios to approximate the continuous random variables.A Scenarios generation approach based on time-homogeneous Markov chain model is proposed to generate simulated time-series of renewable energy generation and load ***,the proposed stochastic programming model is tested in a typical LV network and solved by Matlab optimization *** simulation results show that the proposed stochastic programming model has a better performance to obtain robust scheduling solutions and lower the operating cost compared to the deterministic optimization modeling methods.

关键词： microgrid EMS Markov chain stochastic optimization

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User-oriented QoE-driven server selection for multimedia service provisioning in content distribution networks

User-oriented QoE-driven server selection for multimedia ser...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC)

作者： Sha Yuan Tao Lin Shuotian Bai Song Ci State Key Laboratory of Information Security Institute of Information Engineering Beijing China School of Computer and Control Engineer University of Chinese Academy of Sciences Beijing China Department of Computer and Electronics Engineering University of Nebraska-Lincoln NE USA

Quality of Experience (QoE) support becomes more demanding due to the increasing popularity of multimedia services. However, QoE-based multimedia provisioning will impose a high pressure on server capacity and network bandwidth, which becomes one of the major concerns for both content providers and network operators. A common approach for efficient and scalable multimedia service provisioning in content distribution networks (CDN) is to replicate certain “hot” service or content from the original server to multiple replica servers, usually closer to end users. However, how to direct distributed user requests to an appropriate replica server to fundamentally improve the user perceived service quality largely remains unknown. In this paper, we present a user-oriented QoE-driven server selection scheme to solve the aforementioned problem. Experiments carried out on a real-world network have been performed to evaluate the proposed scheme, and the results show that the proposed scheme can improve QoE perceived by end users at least 24.6%.

关键词： Servers Multimedia communication Quality of service Streaming media Quality assessment Video recording

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Parameters adaption of Lebesgue sampling-based diagnosis and prognosis for Li-ion batteries

Parameters adaption of Lebesgue sampling-based diagnosis and...

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2015 Annual Conference of the Prognostics and Health Management Society, PHM 2015

作者： Yan, Wuzhao Dou, Wanchun Liu, Datong Peng, Yu Zhang, Bin Department of Electrical Engineering University of South Carolina ColumbiaSC29208 United States Department of Computer Science and Technology State Key Lab. for Novel Software Technology Nanjing University NanjingJiangsu210093 China Department of Automatic Test and Control Harbin Institute of Technology HarbinHeilongjiang150080 China

ISBN: (纸本)9781936263202

Traditional fault diagnosis and prognosis (FDP) approaches are based on Riemann sampling (RS), in which samples are taken and algorithms are executed in a periodic time interval. With the increase of system complexity, the real-time implementation of this Riemann sampling-based FDP (RS-FDP) becomes a bottleneck, especially for distributed applications. To overcome this problem, a Lebesgue sampling-based FDP (LS-FDP) is proposed. LS-FDP takes samples on the fault dimension axis and provides a need-based diagnostic philosophy in which the algorithm is executed only when necessary. In previous Lebesgue sampling-based FDP, the Lebesgue length is a constant. To accommodate the change of fault dynamics, it is desirable to execute FDP algorithm more frequently when the fault growth is fast while less frequently when fault growth is slow. This requires to change the Lebesgue length adaptively. The goal of this paper is to deliver an improved LS-FDP method with varying Lebesgue length, which enables the FDP to be executed according to needs. The design and implementation of varying Lebesgue length LS-FDP based on a particle filtering algorithm are illustrated with experimental results on Li-ion batteries to verify the performances of the proposed approach. The experimental results show that the new varying LS-FDP is accurate and time-efficient on long term prognosis and also keeps a closer monitoring on the fast increase of fault size. © 2015, Prognostics and Health Management Society. All rights reserved.

关键词： Real time control

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Generalization of the observer principle for YOULA-Parametrized regulators

Advances in Intelligent Systems and Computing

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Advances in Intelligent Systems and Computing 2015年 330卷 41-47页

作者： Keviczky, László Bányász, Csilla Hungarian Academy of Sciences Computer and Automation Research Institute MTA-BME Control Engineering Research Group H-1111 Budapest Kendeu 13-17 Hungary

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Blind identification strategies for room occupancy estimation

Blind identification strategies for room occupancy estimatio...

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European control Conference

作者： A. Ebadat G. Bottegal D. Varagnolo B. Wahlberg H. Hjalmarsson K. H. Johansson ACCESS the Department of Automatic Control School of Electrical engineering KTH Royal Institute of Technology Division of Signals and Systems Department of Computer Science Electrical and Space Engineering Lulea University of Innovation and Technology

ISBN: (纸本)9781467371605

We propose and test on real data a two-tier estimation strategy for inferring occupancy levels from measurements of CO_2 concentration and temperature levels. The first tier is a blind identification step, based either on a frequentist Maximum Likelihood method, implemented using non-linear optimization, or on a Bayesian marginal likelihood method, implemented using a dedicated Expectation-Maximization algorithm. The second tier resolves the ambiguity of the unknown multiplicative factor, and returns the final estimate of the occupancy levels. The overall procedure addresses some practical issues of existing occupancy estimation strategies. More specifically, first it does not require the installation of special hardware, since it uses measurements that are typically available in many buildings. Second, it does not require apriori knowledge on the physical parameters of the building, since it performs system identification steps. Third, it does not require pilot data containing measured real occupancy patterns (i.e., physically counting people for some periods, a typically expensive and time consuming step), since the identification steps are blind.

关键词： System identification Management of HVAC systems Maximum Likelihood Expectation-Maximization

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Estimation of electromagnetic parameters of an induction motor multi-loop equivalent circuit based on the machine inductance frequency characteristic

Estimation of electromagnetic parameters of an induction mot...

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Selected Problems of Electrical engineering and Electronics (WZEE)

作者： Jaroslaw Rolek Andrzej Kaplon Grzegorz Utrata Politechnika Swietokrzyska Kielce PL Faculty of Electrical Engineering Automatic Control and Computer Science Kielce University of Technology Kielce Poland Institute of Environmental Engineering Czestochowa University of Technology Czestochowa Poland

The variability of electromagnetic parameters of induction motors with deep-bar cage or solid rotors is represented, with a satisfactory approximation, by the machine secondary multi-loop equivalent circuit with constant lumped parameters. An estimation procedure of electromagnetic parameters of such an equivalent circuit is presented in the paper. The procedure is carried out using the measured frequency characteristic determined on the basis of instantaneous values of investigated induction motor electromechanical quantities. The study has been subjected to an induction motor with a solid rotor manufactured from the magnetic material, i.e. a machine characterized by a significant skin effect occurring in rotor solid conductive elements.

关键词： Rotors Induction motors Inductance Frequency measurement Stator windings Magnetic flux

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Modification of Electric Drive Vehicles Performances Using a Direct Torque control with Over-Modulation Ability

Modification of Electric Drive Vehicles Performances Using a...

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Annual Conference of the IEEE Industrial Electronics Society

作者： Ahmad Ghaderi Javad Soltani Mohammad Ebrahimi Amir Ali Forough Nassiraei Research & Development Department Automotive Motor and Electronic Control Group Department of Electrical & Computer Engineering Isfahan University of Technology Graduate School of Life Science and Systems Engineering Kyushu Institute of Technology

ISBN: (纸本)9781479917631

In electric and hybrid-electric vehicles, the inverter output voltage is limited by available DC-link voltage, which restricts the vehicle speed and acceleration. Therefore the fundamental component of the motor voltage should be increased by operating inverter in the six-step mode at high speeds. Although hysteresis based direct torque control (DTC) is a straightforward approach and has several advantages, this method cannot work in the six-step mode. In this paper a new hysteresis based DTC with over modulation ability for interior permanent magnet synchronous machines (IPMSM) is suggested. In this method, unlike the previously proposed methods, the calculation of the voltage vector or flux reference in different phase angles is not necessary. In the proposed method, the flux trajectory is changed by adjusting the non-switching area and modifying switching table, and thus a seamless transformation between high-frequency switching and six-step square wave is possible. Also in this paper, the dynamic model for an electric vehicle is developed which its traction motor is controlled by proposed DTC. The simulation results prove that the proposed method modify the vehicle performances, notably. These results show that the vehicle with proposed method has a higher top speed and better acceleration. Also it is shown, that the proposed method can improve the vehicle efficiency for various driving cycles. In addition the results confirm the torque discontinuity does not appear in the whole range of vehicle speed.

关键词： Over-modulation Direct torque control Seamless Vehicle Electric vehicles Hybrid vehicles IPMSM Motor Six-step operation direct torque control overmodulation Hybrid electric vehicles Electric vehicles vehicle Vehicle speed Motor voltage vector SEAMLESS Vehicle performance

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Introduction

Communications and Control Engineering

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Communications and control engineering 2015年第9783319151700期 1-27页

作者： Hatanaka, Takeshi Chopra, Nikhil Fujita, Masayuki Spong, Mark W. Department of Mechanical and Control Engineering Tokyo Institute of Technology Tokyo Japan Department of Mechanical Engineering University of Maryland College ParkMD United States Erik Jonsson School of Engineering and Computer Science Department of Electrical Engineering University of Texas at Dallas RichardsonTX United States

This chapter first attempts to define the term "networked robotics" in the context of this book, and specifies, among a wide range of the research field, the subjects addressed in this book, namely bilateral teleoperation, visual feedback control/estimation, and cooperative control/estimation. Then, we present comprehensive literature reviews for each research field and an overview of the contents presented in this book. © 2015, Springer International Publishing Switzerland.

关键词： Visual communication

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