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European Conference on Power Electronics and Applications

作者： N. P. Papanikolaou E. C. Tatakis A. C. Kyritsis Technological Educational Institute (TEI) of Lamia Lamia Greece Department of Electrical and Computer Engineering Laboratory of Electromechanical Energy Conversion University of Patras Patras Greece PV System and DER Department Center of Renewable Energy Sources and Saving Athens Greece

ISBN: (纸本)9781424444328

As PV - distributed generation (DG-PV) penetration increases, its reaction with various system disturbances (i.e. voltage drop, short circuit, frequency deviation) has to be taken into account during relative system studies. Though for wind farm generation (WFG) a lot of effort has been made for the development of appropriate models, there is still a lot of progress to be done in the field of PV Generation modelling and especially for DG-PV. This paper presents an analytical model for the case of DG-PV containing a full bridge SPWM inverter, suitable for integration into power system studies. The model will be used to describe the DG-PV behavior under several typical system disturbances, both for the case of grid connection as for the case of an isolated microgrid. Finally, MATLAB/Simulink simulation environment will be used in order to integrate the proposed DG-PV model into a system model.

关键词： Analytical models Distributed power generation Power generation Power system analysis computing Power system modeling Mathematical model Wind energy generation Power system simulation Distributed control Voltage

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Femtosecond laser pulse generation in an erbium-doped ring cavity fiber laser with a single-wall carbon-nanotube saturable absorber

Femtosecond laser pulse generation in an erbium-doped ring c...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Yue Cai Chun Zhou Ling Ren Peng Li Kaili Jiang Zhigang Zhang Institute of Quantum Electronics State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science Beijing Normal University Beijing China Tsinghua-Foxconn Nanotechnology Research Center Tsinghua University Beijing China

We demonstrate a new saturable absorber mirror coated with thin-film single-wall carbon nanotubes. Using such a device, we build a T-type ring cavity fiber laser and obtained pulses of 586 fs.

ISBN: (纸本)9781424438303

We demonstrate a new saturable absorber mirror coated with thin-film single-wall carbon nanotubes. Using such a device, we build a T-type ring cavity fiber laser and obtained pulses of 586 fs.

关键词： Erbium-doped fiber lasers Ring lasers Pulse generation Carbon nanotubes Laser mode locking Optical fiber polarization Optical retarders Mirrors Silver Collimators

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Steady state speed distribution analysis for a combined cellular automaton traffic model

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Chinese Physics B 2008年第8期17卷 2850-2858页

作者：王俊峰陈桂生刘进 College of Computer Science Sichuan University Institute of Electronic System Engineering State Key Laboratory of Software Engineering Wuhan University

Cellular Automaton （CA） based traffic flow models have been extensively studied due to their effectiveness and simplicity in recent years. This paper develops a discrete time Markov chain （DTMC） analytical framework for a Nagel-Schreckenberg and Fukui Ishibashi combined CA model （W^2H traffic flow model） from microscopic point of view to capture the macroscopic steady state speed distributions. The inter-vehicle spacing Maxkov chain and the steady state speed Markov chain are proved to be irreducible and ergodic. The theoretical speed probability distributions depending on the traffic density and stochastic delay probability are in good accordance with numerical simulations. The derived fundamental diagram of the average speed from theoretical speed distributions is equivalent to the results in the previous work.

关键词： cellular automaton traffic flow model speed distribution discrete time Markov chain

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Approximate dynamic job-shop scheduling optimization for semiconductor assembly based on swarm intelligence

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Nanjing Li Gong Daxue Xuebao/Journal of Nanjing University of Science and Technology 2009年第SUPPL. 1期33卷 39-46页

作者： Kang, Qi Yang, Dong-Sheng Wang, Lei Wu, Qi-Di College of Electronics and Information Engineering Shanghai 201804 China Key Laboratory of Embedded System and Computer-service of Ministry of Education Tongji University Shanghai 201804 China

An approximate dynamic optimization method is proposed for a kind of semiconductor assembly job-shop scheduling based on swarm intelligence. In this method, a heuristic swarm stochastic optimization technology, i. e., the particle swarm optimization is adopted to find an optimal operation. sequence and the schedule strategy having the minimal total make-span (TMS) in its admissible sequence space. Meanwhile, a discrete dynamic programming approach is integrated to particle fitness evaluation. The numerical example based on the simplified produce model and the actual produce data is studied to illustrate the effectiveness of the method for job-shop scheduling.

关键词： Job shop scheduling

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An automatic computer-aided detection system for meniscal tears on magnetic resonance images

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IEEE Transactions on Medical Imaging 2009年第8期28卷 1308-1316页

作者： Ramakrishna, Bharath Liu, Weimin Saiprasad, Ganesh Safdar, Nabile Chang, Chein-I Siddiqui, Khan Kim, W. Siegel, Eliot Chai, Jyh-Wen Chen, Clayton Chi-Chang Lee, San-Kan Remote Sensing Signal and Image Processing Laboratory Department of Computer Science and Electrical Engineering University of Maryland Baltimore MD 21250 United States University of Maryland School of Medicine Baltimore MD 21201 United States Department of Electrical Engineering and Environmental Restoration Disaster Reduction Research Center National Chung Hsing University Taichung 402 Taiwan VA Maryland Health Care System Baltimore MD 21201 United States Hospital of the University of Pennsylvania Philadelphia PA 19104 United States Department of Radiology College of Medicine China Medical University Taichung 404 Taiwan Department of Radiology Taichung Veterans General Hospital Taichung 40705 Taiwan Department of Radiological Technology Central Taiwan University of Science and Technology Taichung 406 Taiwan Department of Radiology Taichung Veterans General Hospital Taichung 407 Taiwan

Knee-related injuries including meniscal tears are common in both young athletes and the aging population, and require accurate diagnosis and surgical intervention when appropriate. With proper techniques and radiologists' experienced skills, confidence in detection of meniscal tears can be quite high. This paper develops a novel computer-aided detection (CAD) diagnostic system for automatic detection of meniscal tears in the knee. Evaluation of this CAD system using an archived database of images from 40 individuals with suspected knee injuries indicates that the sensitivity and specificity of the proposed CAD system are 83.87% and 75.19%, respectively, compared to the mean sensitivity and specificity of 77.41% and 81.39%, respectively, obtained by experienced radiologists in routine diagnosis without using the CAD. The experimental results suggest that the developed CAD system has great potential and promise in automatic detection of both simple and complex meniscal tears of the knee. © 2009 IEEE.

关键词： Magnetic resonance imaging

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Programmable and Scalable Per-Flow Traffic Management Scheme Using a Control Server

Programmable and Scalable Per-Flow Traffic Management Scheme...

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IEEE International Conference on Communications (ICC)

作者： Y. Shinohara H. Shimonishi H. Tode K. Murakami Department of Information Networking Graduate School of Information Science and Technology Osaka University Suita Osaka Japan System Platforms Research Laboratory NEC Corporation Limited Kawasaki Kanagawa Japan Department of Computer Science and Intelligent Systems Graduate School of Engineering Osaka Prefecture University Sakai Osaka Japan

We propose a programmable and scalable traffic management scheme. Programmable traffic management at high-speed routers is difficult because programmability and high-speed packet processing have involved a serious tradeoff. To attain both, the new scheme combines control programs at a control server and simple packet handling functions, such as sampling packet headers and discarding packets, at routers. Therefore, by installing appropriate control programs into the server, a variety of active queue management schemes, per-flow bandwidth management schemes, DoS mitigation schemes, and so on, are achieved. One of the main contributions of this paper is its proposal of a statistical scheme for handling flows. As only a fraction of complete flow information stored at the control server is loaded into the router's flow table and it is replaced cyclically, the proposed scheme scales more than the router's flow table capacity. Our simulation results indicate that the scheme provides efficient traffic management, per-flow WFQ emulation in our example, even with very small flow tables compared to the number of concurrently active flows. Furthermore, we discuss implementation issues with the proposed scheme and reveal that the processing cost at the server and router is sufficiently small for use with 10 Gbps links.

关键词： Traffic control Quality of service Communication system traffic control Electronic mail Costs Probability computer network management Technology management engineering management Network servers

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Single-trial analysis of cortical oscillatory activities during voluntary movements using empirical mode decomposition (emd)-based spatiotemporal approach

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Annals of Biomedical engineering 2009年第8期37卷 1683-1700页

作者： Lee, Po-Lei Shang, Li-Zen Wu, Yu-Te Shu, Chih-Hung Hsieh, Jen-Chuen Lin, Yung-Yang Wu, Chi-Hsun Liu, Yu-Lu Yang, Chia-Yen Sun, Chia-Wei Shyu, Kuo-Kai Department of Electrical Engineering National Central University No. 300 Jhongda Rd. Jhongli City Taoyuan County 32001 Taiwan Integrated Brain Research Laboratory Department of Medical Research and Education Taipei Veterans General Hospital Taipei Taiwan Institute of Brain Science National Yang-Ming University Taipei Taiwan Institute of Radiological Science National Yang-Ming University Taipei Taiwan Department of Otolaryngology Taipei Veterans General Hospital Taipei Taiwan National Yang-Ming University School of Medicine Taipei Taiwan Center for Neuroscience National Yang-Ming University Taipei Taiwan Neurological Institute Taipei Veterans General Hospital Taipei Taiwan Institute of Computer Communication and System Engineering Ching-Yun University Taoyuan Taiwan Biophotonics Interdisciplinary Research Center National Yang-Ming University Taipei Taiwan Institute of Biophotonics National Yang-Ming University Taipei Taiwan

This study presents a method based on empirical mode decomposition (EMD) and a spatial template-based matching approach to extract sensorimotor oscillatory activities from multi-channel magnetoencephalographic (MEG) measurements during right index finger lifting. The longitudinal gradiometer of the sensor unit which presents most prominent SEF was selected on which each single-trial recording was decomposed into a set of intrinsic mode functions (IMFs). The correlation between each IMF of the selected channel and raw data on other channels were created and represented as a spatial map. The sensorimotor-related IMFs with corresponding correlational spatial map exhibiting large values on primary sensorimotor area (SMI) were selected via spatial-template matching process. Trial-specific alpha and beta bands were determined in sensorimotor-related oscillatory activities using a two-spectrum comparison between the spectra obtained from baseline period (-4 to -3 s) and movement-onset period (-0.5 to 0.5 s). Sensorimotor-related oscillatory activities were filtered within the trial-specific frequency bands to resolve task-related oscillatory activities. Results demonstrated that the optimal phase and amplitude information were preserved not only for alpha suppression (event-related desynchronization) and beta rebound (event-related synchronization) but also for profound analysis of subtle dynamics across trials. The retention of high SNR in the extracted oscillatory activities allow various methods of source estimation that can be applied to study the intricate brain dynamics of motor control mechanisms. The present study enables the possibility of investigating cortical pathophysiology of movement disorder on a trial-by-trial basis which also permits an effective alternative for participants or patients who can not endure lengthy procedures or are incapable of sustaining long experiments. © 2009 Biomedical engineering Society.

关键词： Intrinsic mode functions

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Wave-front arrival time analysis using wide-area frequency measurements

Wave-front arrival time analysis using wide-area frequency m...

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IEEE General Meeting Power& Energy Society

作者： Jing Ma Jinlong Li Zengping Wang Jie Wu Tao Xia Lang Chen Yilu Liu School of Electrical and Electronic Engineering North China Electric Power University Beijing China Bradley Department of Electrical and Computer Engineering Virginia Polytechnic Institute Blacksburg VA USA Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China Zhejiang Electric Power Design Institute Hangzhou China

Due to the influence of the local noise at the distribution level, the frequency curve obtained from the frequency disturbance recorder (FDR) unit is too non-stationary to observe its wave-front directly, which causes some problems in the event location estimation method. In this paper, a morphological filter (MF) is employed to extract the wave-front arrival time and the trend of the frequency curve. With the help of the MF, the accuracy of the event location method is greatly improved.

关键词： Frequency measurement Frequency estimation Power system measurements Network servers Wide area measurements Filters Web server Global Positioning system Frequency synchronization Power system dynamics

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Optimization dynamics evaluation mode for particle swarm algorithm

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Nanjing Li Gong Daxue Xuebao/Journal of Nanjing University of Science and Technology 2009年第SUPPL. 1期33卷 1-6页

作者： An, Jing Yang, Dong-Sheng Wang, Lei Kang, Qi Wu, Qi-Di College of Electronics and Information Engineering Tongji University Shanghai 201804 China School of Mechanical and Automation Engineering Shanghai Institute of Technology Shanghai 200235 China Embedded System and Computer-service Key Laboratory of Ministry of Education Tongji University Shanghai 201804 China

Based on the fundamental evaluation index system of intelligent optimization, a type of optimization dynamics evaluation mode for particle swarm algorithm is presented here. The mode is used for general optimization performance and particles'population dynamics. In the evaluation mode, primary indexes include optimum value, population dynamic aggregation, population center convergence and population diversity. Numerical optimization simulation based on several benchmarks is studied, and the typical population dynamic results of primary indexes show that the proposed optimization dynamics evaluation mode is effective.

关键词： Population dynamics

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A high capacity 3D steganography algorithm

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IEEE transactions on visualization and computer graphics 2009年第2期15卷 274-84页

作者： Min-Wen Chao Chao-hung Lin Cheng-Wei Yu Tong-Yee Lee Computer Graphics Group Visual System Laboratory Department of Computer Science and Information Engineering National Cheng-Kung University Tainan Taiwan R.O.C. cvivians@***

In this paper, we present a very high-capacity and low-distortion 3D steganography scheme. Our steganography approach is based on a novel multilayered embedding scheme to hide secret messages in the vertices of 3D polygon models. Experimental results show that the cover model distortion is very small as the number of hiding layers ranges from 7 to 13 layers. To the best of our knowledge, this novel approach can provide much higher hiding capacity than other state-of-the-art approaches, while obeying the low distortion and security basic requirements for steganography on 3D models.

关键词： Three Dimensional Graphics And Realism computer Graphics

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