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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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A resource-efficient traffic localization scheme for multiple BitTorrents

A resource-efficient traffic localization scheme for multipl...

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2009 IEEE International Conference on communications, ICC 2009

作者： Huang, Nen-Fu Chu, Yen-Ming Tsai, Chi-Hung Huang, Wei-Zen Tzeng, Wei-Jin Department of Computer Science Inst. of Communication Engineering National Tsing-Hua University Hsin-Chu Taiwan Institute of Communications Engineering National Tsing-Hua University Hsin-Chu Taiwan Dep. of Computer Science National Tsing-Hua University Hsin-Chu Taiwan

ISBN: (纸本)9781424434350

The emergence of peer-to-peer (P2P) applications has posed a threat to the operating cost of Internet Service Providers (ISPs) due to the large amount of inter-ISP traffic generated. The problem stems from the mismatch between the P2P overlay network formed randomly and the underlying physical network. Recently, BitTorrent has attracted enormous users by its convenience of large-scale content distribution and has also become a major challenge for ISPs. Therefore, in this paper we proposed an effective B-Proxy scheme to evaluate through realistic simulation on PlanetLab, where hundreds of BitTorrent clients were executed during the experiment. Simulation results show that more than thirty percent of inter-ISP traffic could be saved in a torrent with a relatively small cache size consumed which is only eighth times that of the original file. ©2009 IEEE.

关键词： Internet service providers

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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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Different species classifier based on hemoglobin sequences

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作者： Mubark, R.I. Keshkd, H.A. Eladawy, M.I. Helwan University Faculty of Engineering Electronics Communication and Computer Dep. Cairo Egypt

ISBN: (纸本)9783540691389

Large-scale analysis studies of genetic sequence data are in progress around the world;one of these studies is to recognize the type of the species that the sequence belongs to. This is very important especially when the source of the sequence is unknown. The complete genome sequence of the hemoglobin provides an excellent basis for studying the clustering of different species. In this paper 13 different species classifier based on hemoglobin sequence has been introduced. Two different classifiers also have been introduced;one of them based on neural network and the other based on extracting 84 pattern feature from the DNA sequence of hemoglobin with the Euclidean distance technique. Both classifiers gave 100% for success recognition of the 13 different species. © 2008 Springer-Verlag.

关键词： Hemoglobin

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Agent-based distributed group key establishment in wireless sensor networks

Agent-based distributed group key establishment in wireless ...

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2007 IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks, WOWMOM

作者： Chatzigiannakis, Ioannis Konstantinou, Elisavet Liagkou, Vasiliki Spirakis, Paul Computer Technology Institute P.O. Box 1122 26110 Patras Greece Department of Computer Engineering and Informatics University of Patras 26500 Patras Greece Dep. of Information and Communication Systems Engineering University of the Aegean 83200 Samos Greece

ISBN: (纸本)1424409926

Wireless sensor networks are comprised of a vast number of ultra-small autonomous computing, communication and sensing devices, with restricted energy and computing capabilities, that co-operate to accomplish a large sensing task. Such networks can be very useful in practice, e.g. in the local monitoring of ambient conditions and reporting them to a control center. In this paper we propose a distributed group key establishment protocol that uses mobile agents (software) and is particularly suitable for energy constrained, dynamically evolving ad-hoc networks. Our approach totally avoids the construction and the maintenance of a distributed structure that reflects the topology of the network. Moreover, it trades-off complex message exchanges by performing some amount of additional local computations in order to be applicable at dense and dynamic sensor networks. The extra computations are simple for the devices to implement and are evenly distributed across the participants of the network leading to good energy balance. We evaluate the performance of our protocol in a simulated environment and compare our results with existing group key establishment protocols. The security of the protocol is based on the Diffie-Hellman problem and we used in our experiments its elliptic curve analog. Our findings basically indicate the feasibility of implementing our protocol in real sensor network devices and highlight the advantages and disadvantages of each approach given the available technology and the corresponding efficiency (energy, time) criteria. ©2007 IEEE.

关键词： Wireless sensor networks

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Calligraphic interfaces: Mixed metaphors for design

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10th International Workshop on Design, Specification, and Verification of Interactive Systems, DSV-IS 2003

作者： Pereira, João P. Jorge, Joaquim A. Branco, Vasco A. Nunes Ferreira, F. Dep. of Informatics Engineering ISEP/INESC-Porto R. S. Tomé Porto Portugal Computer Science Department IST/UTL Av. Rovisco Pais Lisboa Portugal Communication and Arts Department Univ. of Aveiro Aveiro Portugal Dep. of Electrical and Computer Engineering FEUP R. dos Bragas Porto Portugal

ISBN: (纸本)3540201599

CAD systems have yet to become usable at the early stages of product ideation, where precise shape definitions and sometimes even design intentions are not fully developed. To overcome these limitations, new approaches, which we call Calligraphic Interfaces, use sketching as the main organizing paradigm. Such applications rely on continuous input modalities rather than discrete interactions characteristic of WIMP interfaces. However, replacing direct manipulation by sketching alone poses very interesting challenges. While the temptation to follow the paper-and-pencil metaphor is great, free-hand sketch recognition remains an elusive goal. Further, using gestures to enter commands and sketches to draw shapes requires users to learn a command set. sketches do not enjoy the self-disclosing characteristics of menus. Moreover, the imprecise nature of interactions presents additional problems that are difficult to address using present-day techniques. In this paper we approach the three problems outlined above through a combination of different paradigms: First, a calligraphic sketching metaphor provides for a paper-like interaction. Second, dynamic menus. expectation lists. try to expose the state of the application without interfering with the task. Third, an incremental drawing paradigm allows precise drawings to be progressively constructed from sketches through simple constraint satisfaction. Finally, reducing instruction set and command usage allow for a simple and learnable approach in contrast with the complexity of present-day interactive systems. We present a system, GIDeS, which embodies these approaches. Usability testing carried so far yielded encouraging results to warrant further research. © Springer-Verlag Berlin Heidelberg 2003.

关键词： computer aided design

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Word-transliteration alignment 15

Word-transliteration alignment

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15th Conference on Computational Linguistics and Speech Processing, ROCLING 2003

作者： Lin, Tracy Wu, Chien-Cheng Chang, Jason S. Dep. of Communication Engineering National Chiao Tung University 1001 Ta Hsueh Road Hsinchu300 Taiwan Department of Computer Science National Tsing Hua University 101 Kuangfu Road Hsinchu300 Taiwan

The named-entity phrases in free text represent a formidable challenge to text analysis. Translating a named-entity is important for the task of Cross Language Information Retrieval and Question Answering. However, both tasks are not easy to handle because named-entities found in free text are often not listed in a monolingual or bilingual dictionary. Although it is possible to identify and translate named-entities on the fly without a list of proper names and transliterations, an extensive list certainly will ensure the high accuracy rate of text analysis. We use a list of proper names and transliterations to train a Machine Transliteration Model. With the model it is possible to extract proper names and their transliterations in a bilingual corpus with high average precision and recall rates. © Proceedings of the 15th Conference on Computational Linguistics and Speech Processing, ROCLING 2003. All rights reserved.

关键词： Speech processing

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Facial expression recognition using pseudo 3-D Hidden Markov models

Facial expression recognition using pseudo 3-D Hidden Markov...

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作者： Müller, Stefan Wallhoff, Frank Hülsken, Frank Rigoll, Gerhard Dep. of Computer Science Faculty of Electrical Engineering Gerhard-Mercator-University 47057 Duisburg Germany Institute for Human-Machine Communication Technical University of Munich 80290 Munich Germany Fraunhofer Institute for Media Communication IMK Schloss Birlinghoven 53754 Sankt Augustin Germany

In this paper pseudo 3-D Hidden Markov Models (P3DHMMs) are applied to the task of dynamic facial expression recognition. P3DHMMs are an extension of the pseudo 2-D case, which has been successfully used for the classification of images and the recognition of faces. Although the application of P3DHMMs for image sequence recognition has been reported before, this paper provides a formal definition of the novel approach as well as a detailed explanation of a triple embedded Viterbi algorithm. Furthermore an equivalent one-dimensional structure is introduced, which allows the application of the standard Viterbi and Baum-Welch-Algorithms. The approach has been evaluated on a person indep.ndent database, which consists of 4 different facial expressions, performed by 6 individuals. The recognition accuracy achieved in the experiments is close to 90%. © 2002 IEEE.

关键词： Face recognition

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A Sign Language Recognition System Using Hidden Markov Model and Context Sensitive Search 96

A Sign Language Recognition System Using Hidden Markov Model...

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1996 ACM Symposium on Virtual Reality Software and Technology, VRST 1996

作者： Liang, Rung-Huei Ouhyoung, Ming Communication and Multimedia Lab. Dep. of Computer Science and Information Engineering National Taiwan University Taipei Taiwan

ISBN: (纸本)9780897918251

Hand gesture is one of the most natural and expressive ways for the hearing impaired. However, because of the complexity of dynamic gestures, most researches are focused either on static gestures, postures, or a small set of dynamic gestures. As real-time recognition of a large set of dynamic gestures is considered, some efficient algorithms and models are needed. To solve this problem in Taiwanese Sign Language, a statistics based context sensitive model is presented and both gestures and postures can be successfully recognized. A gesture is decomposed as a sequence of postures and the postures can be quickly recognized using hidden Markov model. With the probability resulted from hidden Markov model and the probability of each gesture in a lexicon, a gesture can be easily recognized in a linguistic way in real-time. © 2000 Association for Computing Machinery. All rights reserved.

关键词： Virtual reality

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