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Asynchronism for iterative algorithms in a global computing environment

Asynchronism for iterative algorithms in a global computing ...

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IEEE International symposium on High Performance computing Systems and Applications (HPCS)

作者： J.M. Bahi S. Contassot-Vivier R. Couturier Laboratoire d Infomatique Franche-Comte LIFC I. U. T. de Belfort Montbeliard Belfort France

The subject of this paper is to show the very high power of asynchronism for iterative algorithms in the context of global computing, that is to say, with machines scattered all around the world. The question is whether or not asynchronism helps to reduce the communication penalty and the overall computation time of a given parallel algorithm. The asynchronous programming model is applied to a given problem implemented with a multi-threaded environment and tested over two kinds of clusters of workstations; a homogeneous local cluster and a heterogeneous non-local one. The main features of this programming model are exhibited and the high efficiency and interest of such algorithms is pointed out.

关键词： Iterative algorithms Context Concurrent computing Scattering Parallel algorithms Testing Workstations Clustering algorithms Differential equations Distributed algorithms

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Instruction set extension for long integer modulo arithmetic on RISC-based smart cards

Instruction set extension for long integer modulo arithmetic...

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International symposium on Computer Architecture and High Performance computing (SBAC-PAD)

作者： J. Grossschadl Graz University of Technology Institute for Applied Information Processing and Communications Graz Austria

Modulo multiplication of long integers (/spl ges/ 1024 bits) is the major operation of many public-key cryptosystems like RSA or Diffie-Hellman. The efficient implementation of modulo arithmetic is a challenging task, in particular on smart cards due to their constrained resources and relatively slow clock frequency. We present the concept of an application-specific instruction set extension (ISE) for long integer arithmetic. We introduce an optimized multiply-and-accumulate (MAC) unit that makes it possible to compute a/spl times/b+c+d with only one instruction, whereby a, b, c, d are single-precision words (unsigned integers). This additional instruction is simple to incorporate into common RISC architectures like the MIPS32. Experimental results show that the inner-product operation of a multiple-precision multiplication can be accelerated by a factor of two without increasing the processor's clock frequency. We also estimate the execution time of a 1024-bit modulo exponentiation assuming that this special MAC instruction was made available. The proposed ISE is an alternative solution to a crypto co-processor especially for multi-application smart cards (e.g., Java cards) with an embedded 32-bit RISC core.

关键词： Arithmetic Smart cards Clocks Frequency Reduced instruction set computing Public key cryptography Computer aided instruction Computer architecture Acceleration Coprocessors

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True-3D visualization of glacier retreat in the Dachstein Massif, Austria: Hard- and softcopy displays 1st

True-3D visualization of glacier retreat in the Dachstein Ma...

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1st International symposium on True-3D in Cartography : Autostereoscopic and Solid Visualisation of Geodata, 2009

作者： Bruhm, Katharina Buchroithner, Manfred F. Hetze, Bernd Gindele, Matthias Institute for Cartography Dresden University of Technology Dresden Germany Center of Information Services and High Performance Computing Dresden University of Technology Dresden Germany ACADIS GmbH Wiesbaden Germany

ISBN: (纸本)9783642375323

Glacier recession is a global phenomenon subject to climate change. This also applies to the Dachstein Massif in die Eastern Alps of Austria. Based on historical and recent maps, and moraine mapping the glacier states from the years 1850, 1915 and 2002 were used as input for for photorealistic reconstructions and visualizations of the respective glacier states. A detailed digital terrain model and aerial photographs (2003 – 2006) were provided by the Government of Styria and Joanneum Research Graz. By means of the software packages ERDAS Imagine 9.1, ESRI ArcGIS 9.2, 3D Nature Visual Nature Studio 3 (VNS), Digi-Art 3DZ Extreme and Avaron Tucan 7.2 the glacier conditions during the "Little Ice Age" (+/- 1850) and the following two dates were reconstructed. Subsequently, several derivates of these data sets were generated. First, three individual overflight simulations were computed, permitting to obtain a realistic impression of the Dachstein Massif and its glaciers in 1850, 1915 and 2002. As a second embodiment product, a fast-motion dynamic visualization of the glacier recession was generated which illustrates their decrease in thickness. Third, combining both the flip effect and the true-3D effect achievable by lenticular foils, were applied to produce a multitemporal autostereoscopic hardcopy display. Fourth, the overflight simulation data sets were used to generate stereo-films which could then be displayed on back-projection facilities using either passive polarization glasses or active shutter glasses. © Springer-Verlag Berlin Heidelberg 2012.

关键词： Climate change

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Image registration of real-time video data using the SONIC reconfigurable computer platform

Image registration of real-time video data using the SONIC r...

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Annual IEEE symposium on Field-Programmable Custom computing Machines (FCCM)

作者： W.J.C. Melis P.Y.K. Cheung W. Luk Department of Electrical & Electronic Engineering Imperial College London London UK Department of Computing Imperial College London London UK

This paper is concerned with the image registration problem as applied to video sequences that have been subjected to geometric distortions. This work involves the development of a computationally efficient algorithm to restore the video sequence using image registration techniques. An approach based on motion vectors is proposed and is found to be successful in restoring the video sequence for any affine transform based distortion. The algorithm is implemented in FPGA hardware targeted for a reconfigurable computing platform called SONIC It is shown that the algorithm can efficiently restore the video data in realtime.

关键词： Image registration Video sequences Computer architecture Random access memory Educational institutions Image restoration Watermarking Throughput Image processing Multimedia communication

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Genetic operators setting for the operation planning of hydrothermal systems

Genetic operators setting for the operation planning of hydr...

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Brazilian symposium on Neural Networks

作者： P.T. Leite A. Carneiro A. de Carvalho Electrical Engineering Department Electric Energy System Laboratory São Carlos Engineering School Sao Carlos Brazil Institute of Mathematics Sciences and Computing Computational Intelligence Laboratory Brazil

This paper presents a study of genetic operators used in the operation planning of hydrothermal systems. Such investigation was necessary to define the influence and rate for each genetic operator on the resolution of this problem. In order to adjust genetic algorithms to the problem investigated several traditional genetic operators were adapted. The developed algorithm was applied in real hydrothermal systems, with plants belonging to the Brazilian Southeast system.

关键词： Power system planning Water resources Power generation Artificial intelligence Biological cells Reservoirs Laboratories Genetic algorithms Optimization methods Rivers

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A software design model for parallel applications on heterogeneous systems

A software design model for parallel applications on heterog...

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International symposium on Parallel and Distributed Processing (IPDPS)

作者： M. Dwivedula S. Hariri M. Parashar High Performance Distributed Computing (HPDC) Laboratory Department of Electrical and Computer Engineering University of Arizona Tucson Tucson AZ USA The Applied Software Sytems Laboratory (TASSL) Department of Electrical and Computer Engineering Caip Center-Rutgers University Piscataway NJ USA

Overlap of computations and communications is an effective mechanism to improve the performance of parallel/distributed applications significantly. This overlap can be achieved efficiently by using data partitioning and properly scheduling the data transfer. Various asynchronous communication primitives, that are provided by most message passing tools (e.g. PVM, MPI), can be used to implement the required. Here, we present a design model, the Distributed Software Design Model (DSDM) and show how it can be applied to optimize parallel/distributed applications. We show through several examples, the Master-Slave Merge Sorting Application and the astrophysical N-Body Problem, how the DSDM can be used to develop efficient and optimized implementations of parallel and distributed algorithms.

关键词： Software design Application software Distributed computing Concurrent computing Message passing Processor scheduling Hardware Laboratories Asynchronous communication Design optimization

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Design and evaluation of a resource selection framework for Grid applications

Design and evaluation of a resource selection framework for ...

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International symposium on High Performance Distributed computing

作者： Chuang Liu Lingyun Yang I. Foster D. Angulo Department of Computer Science University of Chicago Chicago IL USA Math & Computer Science Division Argonne National Laboratory Argonne IL USA

While distributed, heterogeneous collections of computers ("Grids") can in principle be used as a computing platform, in practice the problems of first discovering and then organizing resources to meet application requirements are difficult. We present a general-purpose resource selection framework that addresses these problems by defining a resource selection service for locating Grid resources that match application requirements. At the heart of this framework is a simple, but powerful, declarative language based on a technique called set matching, which extends the Condor matchmaking framework to support both single-resource and multiple-resource selection. This framework also provides an open interface for loading application-specific mapping modules to personalize the resource selector. We present results obtained when this framework is applied in the context of a computational astrophysics application, Cactus. These results demonstrate the effectiveness of our technique.

关键词： Processor scheduling Distributed computing Application software Grid computing Computer science Organizing Computer applications Virtual machining Control systems Resource management

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Developing an Object Exchange Model Template for GRIDS distributed supply chain simulations

Developing an Object Exchange Model Template for GRIDS distr...

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Annual symposium on Simulation

作者： Gary Tan Wee Ngee Ng S.J.E. Taylor School of Computing National University of Singapore Singapore Centre for Applied Simulation Modelling Department of Information Systems and Computing Brunei University Uxbridge UK

Supply chain management (SCM) is a series of activities, usually sequential, that an organisation, or a network of organisations, uses to deliver products and/or services to customers. With the globalisation of commercial markets, distributed supply chain (DSQ) simulation, connecting organisations from various parts of the world, has gained significance in supply chain management decision support. DSC simulation requires that information be transferred between individual simulations (interoperability) in a timely and consistent manner. In this work GRIDS (Generic Runtime Infrastructure for Distributed Simulation), an extensible, service-based RTI, is used to successfully transfer timely information between simulations. However, the question of what format this information should take still remains. This paper presents the development of an Object Exchange Model Template (OEMT), for DSC simulation in GRIDS. These are templates for standard object creation within a DSC simulation, so as to facilitate standard object transfers between the various simulations that compose a DSC simulation. The templates are stored in an Object Exchange Model Repository (OEMR) for easy access by all simulation builders intending to build a DSC simulation using GRIDS. The OEMT facilitates interoperability by providing a common "language" that can be used to share information (objects) between simulations. This approach can also facilitate data distribution management (DDM) services. The OEMT is intended to extend and complement the OMT of the High Level Architecture.

关键词： Supply chains Computational modeling Supply chain management Joining processes Runtime Distributed decision making Middleware Documentation Distributed computing Grid computing

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GPBiCG(m, ): A hybrid of BiCGSTAB and GPBiCG methods with efficiency and robustness

GPBiCG(m, ): A hybrid of BiCGSTAB and GPBiCG methods with ef...

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Developments and Trends in Iterative Methods for Large Systems of Equations

作者： Fujino, Seiji Kyushu University Computing and Communications Center 6-10-1 Hakozaki Higashi-ku Fukuoka 812-8581 Japan

In this paper a new iterative method which is a hybrid of the BiCGSTAB and GPBiCG methods is proposed. The present method is an extension of the BiCGSTAB2 method. In the BiCGSTAB2 method which is a hybrid type method, two parameters of the BiCGSTAB method are adopted at even iteration step, and those of the GPBiCG method are used at odd iteration step. In the present GPBiCG(m, ) method, parameters of the BiCGSTAB method are adopted at consecutive m iteration steps, and afterwards those of the GPBiCG method are also utilized in succession at iteration steps. We will examine the convergence property of the GPBiCG(m, ) method and investigate its effectiveness through numerical experiments. © 2001 IMACS. Published by Elsevier Science B.V. All rights reserved.

关键词： Linear systems

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A heuristic approach for path provisioning in Diff-Serv networks

A heuristic approach for path provisioning in Diff-Serv netw...

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IEEE International symposium on Spread Spectrum Techniques and Applications

作者： S. Krile M. Kos Department of Electrical Engineering and Computing Polytechnic of Dubrovnik Dubrovnik Croatia Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia

To achieve QoS guarantees for predicted traffic with N quality levels in differentiated services (Diff-Serv) networks with M interior routers, an efficient heuristic algorithm for end-to-end congestion control is being developed. It can be applied as an effective tool for traffic engineering (TE) in MPLS-based networks or it can be used for network dimensioning in optimal sizing of transmission trunks, minimizing the total expansion cost. The heuristic algorithm is compared with an algorithm based on an exact approach. In all numerical test-examples the best possible result is achieved. It is obvious that heuristic option is very effective and for all cases it is possible to find the best result but with significant savings. It means that such a heuristic approach can be successfully applied for MPLS-based traffic engineering in Diff-Serv networks.

关键词： Intelligent networks Quality of service Multiprotocol label switching Tellurium Telecommunication traffic Bandwidth Computer networks Heuristic algorithms Communication system traffic control Virtual private networks

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