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检索条件"机构=Sch. of Elec. Engineering and Computer Science"

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Fractional bounded arrival process for self-similar traffic policing

Fractional bounded arrival process for self-similar traffic ...

引用

2003 International Conference on Communications (ICC 2003)

作者： Pereira, Flávio de M. Da Fonseca, Nelson L.S. Arantes, Dalton S. Department of Communications Sch. of Elec./Computer Engineering State University of Campinas P.O. Box 6101 13083-970 Campinas/SP Brazil Institute of Computing State University of Campinas P.O. Box 6176 13084-971 Campinas/SP Brazil

In this paper, an envelope process called Fractional Bounded Arrival Process (FBAP) is proposed for self-similar traffic representation. The queueing analysis for FBAP traffic is developed, and upper bounds for the backlog and for the delay are obtained. Finally, the use of the Leaky Bucket algorithm for policing FBAP traffic is investigated.

关键词： Telec.mmunication traffic

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Implementation of smart antenna base station for IS-2000 1X

Implementation of smart antenna base station for IS-2000 1X

引用

57th IEEE Semiannual Vehicular Technology Conference (VTC2003)

作者： Im, Heungjae Hyeon, Seungheon Lee, Weon-Cheol Bahk, Hwanseog Lee, Cheolhoon Kim, Jonghun Choi, Seungwon Sch. of Elec./Computer Engineering Hanyang University 17 Haengdang-Dong Seongdong-Gu Seoul 133-791 Korea Republic of Hantel Co. Ltd. Yujin Bulding 518-8 Dogok-Dong Kangnam-Gu Seoul 135-270 Korea Republic of

This paper presents performance analysis of a smart antenna base station (SABS) that has been implemented for IS-2000 1X system. The SABS introduced in this paper includes all the subsystems required in a commercial base station such as array antenna elements, RF unit, channel card, beamforming unit, GPS unit, etc. The channel card contains subsystems for generating the transmitting data, retrieving the received data, and controlling the transmitting and receiving parts. The data retrieval module, which performs the despreading function, has been realized on an FPGA board in accordance with the array structure and adaptive beamforming procedure of the proposed SABS. In order to provide a proper downlink beamforming as well as uplink beamforming, we present a novel procedure for a practically usable accurate calibration. The performance analysis of the proposed SABS presented in this paper is based on experimental results provided by the commercial mobile terminals in PCS (Personal Communication Service) frequency band.

关键词： Communication systems

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Non-equilibrium acceptor concentration in GaN:Mg grown by metalorganic chemical vapor deposition

Non-equilibrium acceptor concentration in GaN:Mg grown by me...

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GaN and Related Alloys - 2003

作者： Gong, Y. Gu, Y. Kuskovsky, Igor L. Neumark, G.F. Li, J. Lin, J.Y. Jiang, H.X. Ferguson, I. Department of Applied Physics Columbia University New York NY 10027 United States Department of Physics Kansas State University Manhattan KS 66506 United States Sch. of Elec./Computer Engineering Georgia Institute of Technology Atlanta GA 30332-0250 United States

It is shown that the high p-type conductivity in GaN:Mg, grown by metal-organic chemical vapor deposition followed by post-growth annealing, is due to non-equilibrium acceptor concentrations. A series of samples cut from a single GaN:Mg wafer, which initially had undergone rapid thermal annealing (RTA) after growth, has been investigated. The samples were annealed at various temperatures in nitrogen ambient for over 12 hours, and temperature-dependent Hall effect measurements were performed. For samples annealed at temperatures higher than 850C, the hole concentrations decrease by at least an order of magnitude, compared with the original sample. This behavior is explained by an Mg acceptor concentration in excess of its equilibrium solubility limit in the original sample;thus, at high enough temperatures, in the absence of hydrogen, Mg acceptors diffuse either to form elec.rically inactive precipitates or are eliminated. It is worth noting that the acceptor activation energy remains the same for all samples.

关键词： Gallium nitride

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An ART-based hybrid network for medical pattern classification tasks with missing data

An ART-based hybrid network for medical pattern classificati...

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7th International Conference, KES 2003

作者： Lim, Chee Peng Kuan, Mei Ming Harrison, Robert F. Sch. of Elec. and Electron. Eng. University of Science Malaysia Engineering Campus 14300 Nibong Tebal Penang Malaysia Dept. of Automat. Contr. Engineering University of Sheffield Mappin Street Sheffield S1 3JD United Kingdom

ISBN: (纸本)3540408045

In this paper, a hybrid neural network capable of incremental learning and classification of patterns with missing features is proposed. Fuzzy ARTMAP (FAM) is employed as the constituting network for pattern classification while a number of Fuzzy c-Means (FCM) clustering algorithms are used for undertaking the incomplete data problem. To handle training samples with missing features, FAM is first trained with complete samples. Training samples containing missing features are then presented, and the missing values are estimated and replaced by using two FCM-based algorithms. After that, network training is conducted again with all the complete and estimated samples. To handle test samples with missing features, a non-substitution FCM-based approach is employed to yield a predicted output rapidly. A real medical database is used to evaluate, empirically, the performance of the hybrid FAM-FCM network. The results are analysed, discussed, and quantified statistically with the bootstrap method.

关键词： Neural networks

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Photo-Polymer Wafer Bonding for Double Layer Transfer

Photo-Polymer Wafer Bonding for Double Layer Transfer

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Integration of Heterogeneous Thin-Film Materials and Devices

作者： Loryuenyong, Vorrada Sands, Tim Cheung, Nathan W. Dept. of Mat. Sci. and Engineering University of California-Berkeley Berkeley CA 94720 United States School of Materials Engineering Sch. of Elec./Computer Engineering Purdue University W. Lafayette IN 47907-2036 United States Department of Electrical Engineering University of California-Berkeley Berkeley CA 94720 United States

Temporary bonding is necessary for the two-stage transfer of thin films from one substrate to another while preserving the original orientation of the film. The process developed in this study uses an SU-8 photo-polymer both as a bonding material and as a delamination material for layer transfer. SU-8 was spun onto an optically transparent handle wafer (e.g., quartz or glass) and then bonded to the layer to be transferred. The processing parameters such as pre-baking temperature and UV exposure dose affect the bonding strength. UV curing of the SU-8 through the backside of the handle wafer could be performed to obtain the ultimate bond strength at low temperatures. A laser pulse from a KrF excimer laser (λ = 248 nm and τ = 38 ns) at a fluence of 50-150 mJ/cm2 was used to delaminate the SU-8 bonding layer to complete the layer transfer.

关键词： Silicon wafers

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A Rapid Acquisition Technique for Impulse Radio

A Rapid Acquisition Technique for Impulse Radio

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2003 IEEE Pacific Rim Conference on Communications computers and Signal Processing (PACRIM 2003)

作者： Gezici, Sinan Fishier, Eran Kobayashi, Hisashi Poor, H. Vincent Molisch. Andreas F. Department of Electrical Engineering Sch. of Eng. and Applied Science Princeton University Princeton NJ 08544 United States Mitsubishi Elec. Res. Laboratories 201 Broadway Cambridge MA 02139 United States Department of Electroscience Lund University Lund Sweden

A novel rapid acquisition algorithm, called Sequential Block Search, is proposed for impulse radio systems, which can reduce the mean acquisition time considerably. The algorithm is compared to the conventional serial search algorithm and output statistics for both algorithms are derived for a binary phase-shift keyed random time hopping impulse radio system. The mean acquisition time formulas are obtained using the signal flow graph approach. The simulations indicate the superiority of the rapid acquisition algorithm over the serial search technique with a modest increase in the complexity.

关键词： Radio systems

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A Maximal Figure-of-Merit Learning Approach to Text Categorization

A Maximal Figure-of-Merit Learning Approach to Text Categori...

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Proceedings of the Twenty-Sixth Annual International ACM SIGIR Conference on Research and Development in Information Retrieval, SIGIR 2003

作者： Gao, Shena Wu, Wen Lee, Chin-Hui Chua, Tat-Seng Institute for Infocomm Research 21 Heng Mui Keng Terrace Singapore 119613 Singapore School of Computing National Univ. of Singapore 3 Science Drive 2 Singapore Sch. of Elec. and Computer Engr. Georgia Institute of Technology Atlanta GA 30332 United States

A novel maximal figure-of-merit (MFoM) learning approach to text categorization is proposed. Different from the conventional techniques, the proposed MFoM method attempts to integrate any performance metric of interest (e.g. accuracy, recall, precision, or F1 measure) into the design of any classifier. The corresponding classifier parameters are learned by optimizing an overall objective function of interest. To solve this highly nonlinear optimization problem, we use a generalized probabilistic descent algorithm. The MFoM learning framework is evaluated on the Reuters-21578 task with LSI-based feature extraction and a binary tree classifier. Experimental results indicate that the MFoM classifier gives improved F1 and enhanced robustness over the conventional one. It also outperforms the popular SVM method in micro-averaging F1. Other extensions to design discriminative multiple-category MFoM classifiers for application scenarios with new performance metrics could be envisioned too.

关键词： Text processing

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On the implementation of primal-dual interior-point methods for semidefinite programming problems derived from the KYP lemma

On the implementation of primal-dual interior-point methods ...

引用

42nd IEEE Conference on Decision and Control

作者： Vandenberghe, Lieven Ragu Balakrishnan, V. Wallin, Ragnar Hansson, Anders UCLA Department of Electrical Engineering 68-119 Engineering IV Building Los Angeles CA 90095-1594 United States Sch. of Elec./Computer Engineering Purdue University West Lafayette IN 47907-1285 United States Division of Automatic Control Department of Electrical Engineering Linköping University SE-581 83 Linköping Sweden

ISBN: (纸本)0780379241

We discuss fast implementations of primal-dual interior-point methods for semidefinite programs derived from the Kaiman-Yakubovich-Popov lemma, a class of problems that are widely encountered in control and signal processing applications. By exploiting problem structure we achieve a reduction of the complexity by several orders of magnitude compared to general-purpose semidefinite programming solvers.

关键词： Control system analysis

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Teaching Java concurrency to CS vs IT students: A matter of emphasis

Teaching Java concurrency to CS vs IT students: A matter of ...

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Proceedings of the International Conference on Parallel and Distributed Processing Techniques and Applications

作者： Hughes, Charles E. Smith, Marc L. Sch. of Elec. Eng. and Comp. Sci. University of Central Florida 4000 Central Florida Blvd. Orlando FL 32816-2362 United States Computer Science Department Colby College 5853 Mayflower Hill Waterville ME 04901-8858 United States

ISBN: (纸本)1892512416

A number of colleges and universities have recently added new degree programs in Information Technology (IT), or added IT components to existing computer science (CS) programs. Java language and technology are almost inescapable elements of both CS and IT programs. One of Java's more advanced features, language-level support for concurrency in the form of explicit multithreading, is important to both CS and IT students, but for different reasons. Teaching Java concurrency to CS and IT students, therefore, presents different challenges and requires emphasizing the topic in different ways. We discuss these issues, and present our experiences from CS and IT classes taught recently, in which Java concurrency was a topic.

关键词： Java programming language

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Security of digital entertainment content from creation to consumption

Security of digital entertainment content from creation to c...

引用

作者： Eskicioglu, Ahmet M. Town, John Delp, Edward J. Dept. of Comp./Information Science Brooklyn College City University of New York Brooklyn NY 11210 United States Technicolor P.O. Box 7427 Charlottesville VA 22906 United States Video/Image Processing Laboratory Sch. of Elec./Computer Engineering Purdue University West Lafayette IN 47907 United States

With the advent of digital technologies, many new market opportunities have emerged for content owners, content distributors, and consumer elec.ronics/information technology industries. An essential requirement for developing a thriving marketplace is the protection of copyrighted content in digital form. There are four major stages in the delivery of content to the consumer: (1) capturing on digital media, (2) packaging, (3) distribution to home networks, and (4) transfer to the final audio/visual device within the home network. Entertainment content is of particular importance as it will be in high demand for many years to come. If an end-to-end security cannot be provided in a digital market, there would be no incentive for content creation. Lack of new supplies would result in detrimental effects for all the industries involved in the delivery chain. In this paper, we present the primary means of securing the entertainment content from creation to consumption in an attempt to understand the overall complexity of the problem. © 2003 Elsevier science B.V. All rights reserved.

关键词： Multimedia systems

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