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Performance analysis of layer3 switch: Case of flow-driven connection setup

Performance analysis of layer3 switch: Case of flow-driven c...

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1999 Internet Workshop, IWS 1999

作者： Kawahara, Kenji Nakazawa, Shougo Takine, Tetsuya Oie, Yuji Dept. of Computer Science and Electronics Kyushu Institute of Technology Iizuka820-8502 Japan Nara Advanced Institute of Science and Technology Ikoma630-0101 Japan Dept. of Applied Mathematics and Physics Kyoto University Kyoto606-8501 Japan

ISBN: (纸本)0780359259

The layer3 switch enables us to fast transmit IP datagrams using the cut-through technique. The current layer3 router would become a bottleneck in terms of delay performance, as the amount of traffic injected into high speed networks gets relatively large. Thus, the layer3 switch should be an important element in constructing the next generation Internet backbone. We analyze the cut-through rate, the datagram waiting time and the mis-ordered rate of a layer3 switch in case of flow-driven connection setup. In the analysis, by using a 3-state Markov modulated Bernoulli process (MMBP), we model the arrival process of IP flow and IP datagram from each source. Furthermore, we investigate impacts of the arrival rate and the average datagram length on performance. © 1999 IEEE.

关键词： HIgh speed networks

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Extracting all the randomness and reducing the error in Trevisan's extractors 99

Extracting all the randomness and reducing the error in Trev...

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Proceedings of the thirty-first annual ACM symposium on Theory of Computing

作者： Ran Raz Omer Reingold Salil Vadhan Department of Applied Mathematics and Computer Science Weizmann Institute Rehovot 76100 Israel MIT Laboratory for Computer Science 545 Technology Square Cambridge MA

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Improved testing algorithms for monotonicity 3rd

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3rd International Workshop on Randomization and Approximation Techniques in computer Science and 2nd International Workshop on Approximation Algorithms for Combinatorial Optimization Problems, RANDOM-APPROX 1999

作者： Dodis, Yevgeniy Goldreich, Oded Lehman, Eric Raskhodnikova, Sofya Ron, Dana Samorodnitsky, Alex Lab for Computer Science MIT 545 Technology Sq CambridgeMA02139 United States Dept. of Computer Science and Applied Mathematics Weizmann Institute of Science Rehovot Israel Dept. of EE – Systems Tel Aviv University Ramat Aviv Israel DIMACS Center Rutgers University PiscatawayNJ08854 United States

ISBN: (纸本)3540663290

We present improved algorithms for testing monotonicity of functions. Namely, given the ability to query an unknown function f: Σn ↦ Ξ where Σ and Ξ are finite ordered sets, the test always accepts a monotone f, and rejects f with high probability if it is ϵ-far from being monotone (i.e., every monotone function differs from f on more than an _ fraction of the domain). For any ϵ > 0, the query complexity of the test is O((n=/ϵ) · log |Σ| · log | Ξ |). The previous best known bound was Õ ((n2/ϵ) ·|Σ|). We also present an alternative test for the boolean range Ξ = {0,1} whose query complexity O(n2/ϵ2) is independent of alphabet size |Σ|. © Springer-Verlag Berlin Heidelberg 1999.

关键词： computers

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Performance analysis of layer3 switch: case of flow-driven connection setup

Performance analysis of layer3 switch: case of flow-driven c...

引用

Internet Workshop, IWS

作者： K. Kawahara S. Nakazawa T. Takine Y. Oie Department of Computer Science and Electronics Kyushu Institute of Technology Iizuka Japan Department of Applied Mathematics and Physics Kyoto University Kyoto Japan

关键词： Switches Performance analysis computer aided software engineering Asynchronous transfer mode Internet Quality of service Delay Routing Virtual colonoscopy Spine

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Implementation issues of computational fluid dynamics algorithms on parallel computers 6th

Implementation issues of computational fluid dynamics algori...

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6th European Parallel Virtual Machine and Message Passing Interface Users’ Group Meeting, 1999

作者： Plażek, Joanna Banaś, Krzysztof Kitowski, Jacek Section of Applied Mathematics UCK Cracow University of Technology ul. Warszawska 24 Cracow31-155 Poland Institute of Computer Science AGH al. Mickiewicza 30 Cracow30-059 Poland ACC CYFRONET-AGH ul. Nawojki 11 Cracow30-950 Poland

ISBN: (纸本)3540665498

In this paper we compare efficiency of three versions of a parallel algorithm for finite element compressible fluid flow simulations on unstructured grids. The first version is based on the explicit model of parallel programming with message-passing paradigm, the second is the implicit model in which data-parallel programming is used, while in the last we propose a heterogeneous model which combines these two models. Time discretization of the compressible Euler equations is organized with a linear, implicit version of the Taylor-Galerkin time scheme, with finite elements employed for space discretization of one step problems. The resulting nonsymmetric system of linear equations is solved iteratively with the preconditioned GMRES method. The algorithm has been tested on two parallel computers HP SPP1600 and HP S2000 using a benchmark problem of 2D inviscid flow simulations - the ramp problem. © Springer-Verlag Berlin Heidelberg 1999.

关键词： Flow simulation

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Computation of time optimal swing up control of single pendulum

Computation of time optimal swing up control of single pendu...

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Annual Conference of Industrial Electronics Society

作者： K. Furuta Y. Xu R. Gabasov Graduate School of Information Science and Engineering Tokyo Institute of Technology Meguro Tokyo Japan Faculty of Applied Mathematics and Computer Science Belarusian State University Minsk Belarus

Time optimal control under bounded input has been studied. This paper presents a computational strategy to obtain the time optimal control for nonlinear systems, and discrete time control under input bound is considered. The swing up control of a single pendulum from pendant stable equilibrium to upright unstable equilibrium is used to illustrate our approaches. For a simplified model of the single pendulum, which is a second-order system, an approach based on the linear programming method is introduced, while for the actual single pendulum, an approach based on nonlinear optimization is introduced. Simulation results show that our computational approaches are feasible.

关键词： Optimal control Nonlinear systems Linear programming Ear Control systems Equations Information science mathematics computer science Optimization methods

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Design and implementation of a PC-based video-on-demand system

Design and implementation of a PC-based video-on-demand syst...

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International Conference on Information Networking

作者： Hung-Yu Kao Yu-Chen Kuo Shing-Tsaan Huang Biing-Feng Wang Department of Computer Science National Tsing Hua University Hsinchu Taiwan Department of Applied Mathematics Tatung Institute of Technology Taipei Taiwan

ISBN: (纸本)0818672250

In the recent years, VOD (Video-On-Demand) systems have been extensively proposed, researched and developed because of their great marketable value. In this paper, we propose a total solution to construct and implement a practical PC-based VOD system. From the viewpoint of implementation, we separate our VOD system into three separate modules, including storage management module, communication module and playback module. We propose some special design, such as disk modeling and scheduling, lightweight transmission protocol and some playback mechanisms for these modules to meet the requirements of a VOD system.

关键词： Protocols Ethernet networks Network servers Processor scheduling Hard disks Data communication Streaming media Content management computer science mathematics

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Approximating posterior distributions in belief networks using mixtures

Approximating posterior distributions in belief networks usi...

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11th Annual Conference on Neural Information Processing Systems, NIPS 1997

作者： Bishop, Christopher M. Lawrence, Neil Jaakkola, Tommi Jordan, Michael I. Neural Computing Research Group Dept. Computer Science and Applied Mathematics Aston University Birmingham B4 7ET United Kingdom Center for Biological and Computational Learning Massachusetts Institute of Technology 79 Amherst Street E10-243 Cambridge MA 02139 United States

ISBN: (纸本)0262100762

Exact inference in densely connected Bayes an networks is computationally intractable, and so there is considerable interest in developing effective approximation schemes. One approach which has been adopted is to bound the log likelihood using a mean-field approximating distribution. While this leads to a tractable algorithm, the mean field distribution is assumed to be factorial and hence unimodal. In this paper we demonstrate the feasibility of using a richer class of approximating distributions based on mixtures of mean field distributions. We derive an efficient algorithm for updating the mixture parameters and apply it to the problem of learning in sigmoid belief networks. Our results demonstrate a systematic improvement over simple mean field theory as the number of mixture components is increased.

关键词： Mixtures

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Autonomous garbage collection: resolving memory leaks in long running network applications

Autonomous garbage collection: resolving memory leaks in lon...

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International Conference on computer Communications and Networks (ICCCN)

作者： B. Willard O. Frieder Electronics and Systems Integration Division Northrop Grumman Corporation Melbourne FL USA Department of Computer Science & Applied Mathematics Illinois Institute of Technology Chicago IL USA

ISBN: (纸本)0818690143

Garbage collection is especially useful for long running server applications in network environments since sustained memory leaks continuously degrade performance and eventually result in application failure. We demonstrate the benefits of a garbage collection technique that effectively mitigates performance degeneration due to memory leaks in applications when source code or object code are not available. Our technique is an extension of the garbage collection method known as conservative garbage collection. We refer to this as autonomous garbage collection. Our prototype demonstrates that this garbage collection technique is indeed feasible. Furthermore, our experimental results show that this technique is more general and easier to use than many of the previous garbage collection proposals targeted at resolving memory leaks in non-cooperative server applications.

关键词： Intelligent networks Random access memory Network servers Programming profession Memory management Application software Read-write memory Telecommunication network reliability Degradation Prototypes

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Now for the laboratory experience! The view from four different undergraduate computer science curricula

Now for the laboratory experience! The view from four differ...

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Frontiers in Education (FIE) Conference

作者： J.C. Prey D.L. Baldwin M.M. Reek J.L. Popyack Department of Computer Science School of Engineering and Applied Sciences University of Virginia Charlottesville VA USA Department of Computer Science SUNY Geneseo Geneseo NY USA Computer Science Department Rochester Institute of Technology Rochester NY USA Department of Mathematics & Computer Science Drexel University Philadelphia PA USA

There is much discussion about the undergraduate computer science curriculum. With the rapid changes in computer science, the need to stay current is mandatory while the ability to develop and implement a contemporary undergraduate curriculum is extremely time-consuming and costly. Four schools have each developed a different model to undergraduate computer science education. Each school believes the work done has been successfully implemented at the respective institutions. They also believe that these works can be successfully adapted by others. An overview is given of the laboratory models and topics developed for a laboratory activity.

关键词： Laboratories computer science computer science education Grounding Solid modeling Mathematical model Drives mathematics Educational institutions Employment

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