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International Conference on Parallel Processing (ICPP)

作者： Haibo Chen Rong Chen Fengzhe Zhang Binyu Zang Pen-Chung Yew Parallel Processing Institute Fudan University China Dpt. of Computer Science and Engineering University of Minnesota Twin-Cities USA

There has recently been increasing interests in using system virtualization to improve the dependability of HPC cluster systems. However, it is not cost-free and may come with some performance degradation, uncertain QoS and loss of functionalities. Meanwhile, many virtualization-enabled features such as online maintenance and fault tolerance do not require virtualization being always on. This paper proposes a technique, called self-virtualization, that supports dynamically attaching and detaching a full-fledged virtual machine monitor (VMM) beneath an operating system, without disturbing applications thereon, and rid the system of potential overhead when the virtualization is not needed. This technique enables HPC clusters to reap most benefits from virtualization without sacrificing performance. This paper presents the design and implementation of Mercury, a working prototype based on Linux and Xen VMM. Our performance measurement shows that Mercury incurs very little overhead: about 0.2 ms to complete a mode switch, and negligible performance degradation compared to Linux.

关键词： Degradation Linux Switches Performance loss Fault tolerance Joining processes Virtual machine monitors Operating systems Application virtualization Prototypes

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OPTIMAL LOGIC SYNTHESIS OF COMBINATIONAL CIRCUITS USING K-LUT FPGA

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IFAC Proceedings Volumes 2007年第18期40卷 661-666页

作者： Ion I. Bucur Alexandru E. şuşu University Politehnica of Bucharest Computer Science and Engineering Dpt. bucurb@cs.pub.ro Swiss Federal Institute of Technology Lausanne (EPFL) IC/STI Department alex.susu@epfl.ch

Determining if a given arbitrary, wide function can be implemented by a programmable logic block, is unfortunately, in general, a very difficult problem, called the Boolean matching problem. We introduce a novel implemented algorithm able to map for performance combinational networks using k -LUT based FPGAs. We consider in this paper delay optimum and area optimal k-LUT FPGA mapping algorithms and compare them against a newly developed and recently improved algorithm.

关键词： k-LUT based FPGA algorithms for delay optimal mapping k-feasible cones

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The MPEG-7 query format: a new standard in progress for multimedia query by content

The MPEG-7 query format: a new standard in progress for mult...

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International Symposium on Communications and Information Technologies (ISCIT)

作者： Kevin Adistambha Mario Doeller Ruben Tous Matthias Gruhne Masanori Sano Chrisa Tsinaraki Stavros Christodoulakis Kyoungro Yoon Christian H. Ritz Ian S. Burnett School of Electrical Computer and Telecommunications Engineering University of Wollongong Australia Department Distributed Information Technology University of Passau Passau Germany Dpt. d'Arquitectura de Computadors Universitat Poliltècnica de Catalunya Barcelona Spain Department Metadata Fraunhofer IDMT Germany NHK Science and Technology Research Laboratories Japan Laboratory of Distributed Multimedia Information Systems & Applications Technical University of Crete Greece School of Computer Science and Engineering Konkuk University Seoul South Korea

In recent years, the amount of Internet accessible digital audiovisual media files has vastly increased. Therefore the need to describe the media (by way of metadata) has also increased significantly. MPEG-7 (finalized in 2001) provides a comprehensive and rich metadata standard for the description of multimedia content. Unfortunately, a standardized query format does not exist for MPEG-7, or other multimedia metadata. Such a standard would provide for communications between querying clients and databases, supporting cross-modal and cross-media retrieval. The lSO/lEC SC29WG11 committee decided therefore to contribute to this application space by adding such functionality as a new part of the MPEG-7 series of standards. In response to a Call for Proposals, six proposals were submitted. This paper describes the strengths of each proposal as well as the resulting draft standard for the MPEG-7 query format.

关键词： MPEG 7 Standard Multimedia databases Electronic mail Proposals Database languages Multimedia systems Telecommunication computing Identity-based encryption ISO IEC

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Context-sensitive content representation for static document

Context-sensitive content representation for static document

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11th Asia-Pacific Software engineering Conference (APSEC 2004)

作者： Chu, WC Chen, YW Chen, JN Dpt. of Computer Science and Information Engineering Tunghai University Taiwan Dpt. of Engineering Science National Cheng Kung University Taiwan

ISBN: (纸本)0769522459

Due to the convenience of pervasive information environment, many people use various computing devices to perform plenty kinds of tasks. In the field of education, there are various applications to facilitate learner, especially for e-learning. However, some computing devices suffer from the limited resources and can not accept rich information content. Therefore, the information content has to be tailored into different kinds of presentation depending on the types of computing devices. Context sensitivity is an application software system's ability to sense and analyze context from various sources. In this paper, we aim to customize static documents using context-sensitive middleware (CSM) to sense the computing device, and then using the agent-based parser to provide suitable content representation dynamically.

关键词： e-learning context-sensitive customization

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Automatic discovery of translation collocations from bilingual corpora 16

Automatic discovery of translation collocations from bilingu...

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16th European Conference on Artificial Intelligence, ECAI 2004

作者： Barrachina, Sergio Vilar, Juan Miguel Dpt. of Computer Engineering and Science Universitat Jaume I Castellón Spain Dpt. of Programming Languages and Computer Systems Universitat Jaume I Castellón Spain

ISBN: (纸本)9781586034528

We describe a method to automatically discover translation collocations from a bilingual corpus and how these improve a machine translation system. The process of inference of collocations is iterative: An alignment is used to derive an initial set of collocations, these are used in turn to improve the alignment and this new alignment is used to generate new collocations. This process is repeated until no more collocations are found. The final alignment and the set of collocations are used to train a translation model. We use a model that is based on finite state transducers and word clusters and has been modified to work with collocations in addition to single words. We present experiments in which we show that automatic collocations improve translation quality without prior linguistic information.

关键词： Alignment

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Context-sensitive content representation for static document

Context-sensitive content representation for static document

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Asia-Pacific Conference on Software engineering

作者： W.C. Chu Y.W. Chen J.N. Chen Dpt. of Computer Science and Information Engineering Tunghai University Taiwan Dpt. of Engineering Science National Cheng Kung University Taiwan

Due to the convenience of pervasive information environment, many people use various computing devices to perform plenty kinds of tasks. In the field of education, there are various applications to facilitate learner, especially for e-learning. However, some computing devices suffer from the limited resources and cannot accept rich information content. Therefore, the information content has to be tailored into different kinds of presentation depending on the types of computing devices. Context sensitivity is an application software system's ability to sense and analyze context from various sources. In this paper, we aim to customize static documents using context-sensitive middleware (CSM) to sense the computing device, and then using the agent-based parser to provide suitable content representation dynamically.

关键词： Application software Electronic learning Personal digital assistants Pervasive computing Middleware Embedded computing Web pages computer science computer science education Mobile computing

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Incremental and iterative monolingual clustering algorithms 8

Incremental and iterative monolingual clustering algorithms

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8th European Conference on Speech Communication and Technology, EUROSPEECH 2003

作者： Barrachina, Sergio Vilar, Juan Miguel Dpt. of Computer Engineering and Science Universidad Jaume i Spain Dpt. of Programming Languages and Computer Systems Universidad Jaume i Spain

To reduce speech recognition error rate we can use better statistical language models. These models can be improved by grouping words into word equivalence classes. Clustering algorithms can be used to automatically do this word grouping. We present an incremental clustering algorithm and two iterative clustering algorithms. Also, we compare them with previous algorithms. The experimental results show that the two iterative algorithms perform as well as previous ones. It should be pointed out that one of them, that uses the leaving one out technique, has the ability to automatically determine the optimum number of classes. These iterative algorithms are used by the incremental one. On the other hand, the proposed incremental algorithm achieves the best results of the compared algorithms, its behavior is the most regular with the variation of the number of classes and can automatically determine the optimum number of classes.

关键词： Clustering algorithms

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A model of nonstationary input stream for simulation modeling of communication networks

A model of nonstationary input stream for simulation modelin...

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International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Service (TELSIKS)

作者： P.T. Antonov D.G. Razsadov Computer Science and Engineering Dpt. TU Vama Bulgaria

In the majority of analytical and imitation models analyzing the processes of communication networks functioning, input streams are associated with the well known Poisson's model, describing the most unfavorable case of stationary random streams. In practice the input streams are characterized mainly with strong nonstationary processes, impacting the final results of modeling to a significant degree. Having this in mind this report presents an input stream model for simulation modeling and analysis of communication networks.

关键词： Communication networks Analytical models Telecommunication traffic Traffic control computer science Fractals Page description languages

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Causal and Anticipative Models for the Dimensioning of 3G Multiservice Networks

Causal and Anticipative Models for the Dimensioning of 3G Mu...

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IEEE Global Telecommunications Conference GLOBECOM'03

作者： Jaumard, Brigitte Meyer, Christophe Pooyania, Raha Solari, Yannick Voisin, Catherine Dpt. of Computer Science Université de Montréal Montréal Que. H3C 3J7 Canada Dpt. of Electrical Engineering Ecl. Polytech. de Montreal Montréal Que. H3C 3A7 Canada

We study mathematical models and discuss optimization algorithms for the dimensioning of 3G multimedia networks. We propose two models which aims at dimensioning networks with both a radio and a core component. The first one is an anticipative one in which we assume that we know a priori the traffic over the planning period and the dimensioning is defined with a best possible call admission control procedure. The second one is a causal one in which we define an explicit call admission control procedure which makes the accept/reject decisions without any knowledge on the forthcoming traffic. We then compare, on an experimental basis, the dimensioning obtained by both models on some multi-service networks.

关键词： Telecommunication networks

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A novel W-band radar for airport traffic monitoring: implementation, first operational results, perspectives

A novel W-band radar for airport traffic monitoring: impleme...

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International Kharkov Symposium on Physics and engineering of Microwaves, Millimeter, and Submillimeter Waves

作者： F. Mauro G. Galati M. Naldi Oerlikon Contraves Rome Italy Dpt. of Computer Science SYstems and Production Engineering (DISP) Roma Italy Department of Computer Science Systems and Production Engineering (DISP) Tor Vergate University Rome Italy

High resolution requirements for airport surface traffic monitoring with lightweight, small, all-weather sensors call for the use of a network of millimetre-wave radars to perform the surveillance function in the surface movement control and guidance system. In this paper a W-band radar employed as the basic sensor is described. Some results of recent and present field trials are reported.

关键词： Radar Airports Monitoring Communication system traffic control Air traffic control Sensor systems Surveillance Lighting control Control systems Sensor phenomena and characterization

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