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EFFICIENTLY MAPPING LARGE COMBINATIONAL CIRCUITS ON K-LUT BASED FPGAS

IFAC Proceedings Volumes 2007年第18期40卷 667-672页

作者： Ion I. Bucur Costin-Anton Boiangiu University Politehnica of Bucharest Romania Computer Science and Engineering Dpt. bucurb@cs.pub.ro costin@cs.pub.ro.

Large combinational circuits need to be partitioned in order to manage scarce resources on k-LUT based FPGAs . Circuit partitioning has multiple applications in VLSI design. One of the most common is that of dividing combinational circuits (usually large ones) that will not fit on a single package among a number of packages. Partitioning is of practical importance for k- LUT based FPGA circuit implementation. In this work is presented a multilevel multi-resource partitioning algorithm for partitioning large combinational circuits using cone-clusters in order to efficiently map existing and commercially available k -LUT based FPGAs packages.

关键词： two-way partitioning multi-way partitioning recursive partitioning flat partitioning cone-clusters critical path cutting cones bottom-up clusters

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Mercury: Combining Performance with Dependability Using Self-virtualization

Mercury: Combining Performance with Dependability Using Self...

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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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Analytical and Experimental IP Encapsulation Efficiency Comparison of GSE, MPE, and ULE over DVB-S2

Analytical and Experimental IP Encapsulation Efficiency Comp...

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International Workshop on Satellite and Space Communications (IWSSC)

作者： A. Mayer B. Collini-Nocker F. Vieira J. Lei M.A. Vazquez Castro Multimedia Comm. Group Dpt. of Computer Sciences University of Salzburg Salzburg Austria Department Telecommunications and Systems Engineering Universitat Autònoma Barcelona Barcelona Spain

Transmitting variable-length network layer (IP) packets over satellite links with fixed frame lengths (or lengths depending on the ACM transmission mode) requires (IP) encapsulation. For DVB-S links with fixed-size 188-byte TS packets, MPE and ULE encapsulations are available. DVB-S2 provides a compatibility mode to pack TS packets into the longer base band frames (BBFrames). Thus MPE and ULE are also available for S2, as well as a native generic stream encapsulation (GSE), avoiding the double overhead of TS and BBFrame encapsulation. The present paper gives a short overview on the available encapsulation protocols for DVB-S2, and then provides a mathematical efficiency calculation model for these encapsulations, in order to allow for performing theoretical efficiency simulations. Comparison graphs of the efficiency values are presented, using both the efficiency models and measurements from real satellite traffic.

关键词： Encapsulation Digital video broadcasting Protocols Satellite broadcasting Traffic control Modeling Telecommunication computing systems engineering and theory Artificial satellites TV broadcasting

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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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A Proxy for Privacy: the Discreet Box

A Proxy for Privacy: the Discreet Box

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EUROCON 2007 - The International Conference on " computer as a Tool" (EUROCON 2007), vol.4

作者： Georgios V. Lioudakis Eleftherios A. Koutsoloukas Nikolaos Dellas Sofia Kapellaki George N. Prezerakos Dimitra I. Kaklamani Iakovos S. Venieris School of Electrical and Computer Engineering National and Technical University of Athens Athens Greece Dpt. of Electronic Computing Systems Technological Education Institute of Piraeus Piraeus Greece

The issue of user privacy is constantly brought to the spotlight since an ever increasing number of online services collects and processes personal information from users, in the context of personalized service provision. Although technology makes the collection of data easy, their protection against abuse is left to data protection legislation. However, the privacy requirements, other than being general and abstract terms to be regarded as legislature issues, should be brought down in the technological reality and carefully accounted for in devising technical solutions. In order to limit the disclosure and avoid the misuse of personal data, this paper discusses an architectural proposal for a middleware system that will enforce protection of user privacy through technical means. This goal is facilitated by a combination of a policy framework, a sensible interpretation of regulations into policies and the introduction of a privacy broker, named the Discreet Box.

关键词： Privacy Privacy Middleware Ontologies Privacy Legislation

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Towards a framework for dedicated operating systems development in high-end computing systems

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Operating systems Review (ACM) 2006年第2期40卷 16-21页

作者： Tournier, Jean-Charles Bridges, Patrick G. Maccabe, Arthur B. Widener, Patrick M. Abudayyeh, Zaid Brightwell, Ron Riesen, Rolf Hudson, Trammel Dpt. of Computer Science University of New Mexico Albuquerque NM 87131-0001 Sandia National Laboratories MS 11110 PO Box 5800 Albuquerque NM 87185-1110 Operating Systems Research Inc. 1729 Wells Drive NE Albuquerque NM 87112

In the context of high-end computing systems, general-purpose operating systems impose overhead on the applications they support due to unneeded services. Although dedicated operating systems overcome this issue, they are difficult to develop or adapt. In this paper, we propose a framework, based on the component programming paradigm, which supports the development and adaptation of such operating systems. This framework makes possible the a la carte construction of operating systems which provide specific high-end computing system characteristics.

关键词： computer operating systems

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Asynchronous event-based communication across Service Brokers

Asynchronous event-based communication across Service Broker...

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12th European Wireless Conference 2006 - Enabling Technologies for Wireless Multimedia Communications

作者： E. Koutsoloukas S. Kapellaki G. N. Prezerakos N. Tselikas I. S. Venieris D. I. Kaklamani Intelligent Communications and Broadband Networks Laboratory School of Electrical and Computer Engineering National Technical University of Athens 9 Heroon Polytechneioy str Zografou Greece Technological Education Institute of Piraeus Faculty of Technology Dpt. of Electronic Computing Systems Petrou Ralli & Thivon 250 122 44 Athens Greece

Modern communication environments tend to be complex, dynamic and highly distributed. For the provision of messaging in such environments multiple entities, providing different functionalities and located remotely from each other, must cooperate in order to perform different tasks and provide different kind of information for the completion of the service provision lifecycle. Within this paper we present an implementation analysis of the communication mechanism which was employed in a distributed brokerage framework for the provision of context aware personalized services. The paper focuses on the inter-broker communication mechanism which enables the transparent interaction between components located in different brokers. The mechanism was designed and implemented having in mind relevant requirements such as transparency, modularity and high availability. The design and implementation was based on web service practices and the SOAP protocol.

关键词： Laboratories

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Adaptive filtering of advertisements on web pages 05

Adaptive filtering of advertisements on web pages

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14th International World Wide Web Conference, WWW2005

作者： Esfandiari, Babak Nock, Richard Dpt. of Systems and Computer Engineering Carleton University 1125 Colonel By Drive Ottawa ON K1S5B6 Canada GRIMAAG-DSI/Univ. Antilles-Guyane Campus de Schoelcher B.P. 7209 97275 Schoelcher Cedex Martinique

ISBN: (纸本)1595930515

We present a browser extension to dynamically learn to filter unwanted images (such as advertisements or flashy graphics) based on minimal user feedback. To do so, we apply the weighted majority algorithm using pieces of the Uniform Resource Locators of such images as predictors. Experimental results tend to confirm that the accuracy of the predictions converges quickly to very high levels.

关键词： Websites

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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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