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6th International Conference on Information Technology and Applications, ICITA 2009

作者： Jayaraman, Ramkumar Maskell, Douglas L. Center of High Performance Embedded Systems Nanyang Technological University Singapore Singapore School of Computer Engineering Nanyang Technological University Singapore Singapore Reconfigurable Computing Group Center of High Performance Embedded Systems Singapore Singapore

ISBN: (纸本)9789810830298

Mobile platforms can employ FPGA based hardware accelerators to address the ever-increasing demand for computing performance. Design flows offered by Xilinx and Impulse CoDeveloper allow for a flexible and rapid development of FPGA based hardware accelerators for SoC designs. For many applications, the use of an operating system on the hardware platform proves beneficial for reasons of better resource management and more robust security. This paper demonstrates the use of a framework that enables a hardware-software partitioned application to execute on Embedded Linux and evaluates the performance implications of the hardware-software partitioned system with respect to the introduction of Linux, caching and compiler optimization techniques. Results reveal that the degradation in the performance with the introduction of Linux OS is minimal. It is also found that compiler optimization and caching significantly affect the performance of the hardware accelerated system. © ICITA 2009.

关键词： Field programmable gate arrays (FPGA)

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Simulating Software Evolution with Varying Numbers of Developers and Validation Using OSS

Simulating Software Evolution with Varying Numbers of Develo...

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Australian Software Engineering Conference (ASWEC)

作者： B. Stopford S. Counsell E. Nasseri High Performance Computing Group Royal Bank of Scotland PLC Angel London Dept of Information Systems and Computing Brunel University

ISBN: (纸本)9781424437689

An issue that has confounded the understanding of software development in the past is the role that different numbers of developers play in the construction and subsequent evolution of software. In this paper, we investigate that facet of software using a configurable simulation framework as a basis. The framework uses 'agents' to represent developers and models the costs associated with first comprehending and then applying necessary changes to a fictitious code base. It also considers agent 'memory recall' of their own code as a fundamental part of the framework and the fact that, with higher numbers of developers, maintenance of a higher proportion of other developers' code (rather than their own) is an inevitable, yet realistic aspect. Through exploration of the results and data produced by the simulation, we are able to explore 'desirable' features that are part of simulating software evolution;as a discussion of the issues raised by the framework, we provide a set of class data from four open-source systems by way of comparison and show that trends in those systems are comparable with results generated by the simulation. The paper thus provides evidence that we can use simulation tools to help model evolving systems, whether based on default settings or user-configurable settings.

关键词： Costs Open source software Computational modeling Programming Australia Software engineering Software performance high performance computing Programmable control Information systems

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Accurate Analytical Models for Message Passing on Multi-core Clusters

Accurate Analytical Models for Message Passing on Multi-core...

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Euromicro Conference on Parallel, Distributed and Network-Based Processing

作者： Bibo Tu Jianping Fan Jianfeng Zhan Xiaofang Zhao National Research Center of Intelligent Computing Systems Institute of Computing Technology Chinese Academy and Sciences Beijing China Research Center of High Performance Computing Shenzhen Institute of Advanced Technology Chinese Academy and Sciences Shenzhen China

Memory hierarchy on multi-core clusters has two-fold characteristics: vertical memory hierarchy and horizontal memory hierarchy. Vertical memory hierarchy has been modeled by previous work (e.g. memory logP, log n P, log 3 P etc.) to analyze middlewarepsilas effects on point-to-point communication with different message sizes and message strides; Horizontal memory hierarchy has become more prominent due to distinct performance among three levels of communication in a multi-core cluster: intra-CMP, inter-CMP and inter-node, which should adequately be considered. Derived from log n P and log 3 P models, new analytical models mlognP and its reduction 2log {2,3} P are proposed to unitedly abstract memory hierarchy on multi-core clusters in vertical and horizontal levels. The results of performance evaluation show that it is indispensable to incorporate horizontal memory hierarchy into new models suitable for multi-core clusters, and 2log {2,3} P model can predict communication costs for message passing on multi-core clusters more accurately than log 3 P model.

关键词： Analytical models Message passing Multicore processing Middleware Predictive models high performance computing performance analysis Costs Supercomputers Bandwidth

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Technical program overview

International Geoscience and Remote Sensing Symposium (IGARS...

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International Geoscience and Remote Sensing Symposium (IGARSS) 2009年 5卷 xvi-xvii页

作者： Inggs, Michael King, Roger University of Cape Town Centre for High Performance Computing South Africa Mississippi State University Center for Advanced Vehicular Systems United States

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Fully analytical methodology for fast end-to-end link analysis on complex printed circuit boards including signal and power integrity effects

Fully analytical methodology for fast end-to-end link analys...

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Designcon 2009

作者： Gu, Xiaoxiong De Paulis, Francesco Rimolo-Donadio, Renato Shringarpure, Ketan Zhang, Yaojiang Archambeault, Bruce Connor, Sam Kwark, Young H. Ritter, Mark B. Fan, Jun Schuster, Christian IBM T.J. Watson Research Center NY United States University of L'Aquila Italy Technische Universitat Hambürg Harburg Germany Missouri Institute of Science and Technology MO United States Institute of High Performance Computing Singapore Singapore IBM Systems and Technology Group Research Triangle Park NC United States

ISBN: (纸本)9781615670499

high speed printed circuit boards (PCBs) can be extremely complex with a large number of via structures and transmission lines. Rapid analysis of on-board high speed nets including the non-TEM effects of vias with full-wave electromagnetic field solvers has been unrealistic. However, using a systematic, cascaded analytical approach, these high speed nets can now be analyzed quick enough to do design discovery and optimization during the pre-layout phase. The self assembly of the cascaded link path, using analytical models for each individual portion, allows this analysis to be performed in very short time, replacing the time consuming traditional full wave simulation techniques without sacrificing accuracy.

关键词： Printed circuit boards

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Welcome to the Creativity & Cognition 2009 Proceedings

C and C 2009 - Proceedings of the 2009 ACM SIGCHI Conference...

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C and C 2009 - Proceedings of the 2009 ACM SIGCHI Conference on Creativity and Cognition 2009年 v-vi页

作者： Gross, Mark D. Johnson, Hilary Wakkary, Ron Ox, Jack Nagai, Yukari Computational Design Lab School of Architecture Carnegie Mellon University 5000 Forbes Avenue PittsburghPA United States HCI Group University of Bath BA2 7AY United Kingdom School of Interactive Arts and Technology Simon Fraser University 250 - 13450 102nd Avenue SurreyBCV3T 0A3 Canada College of Fine Arts Center for High Performance Computing University of New Mexico AlbuquerqueNM87131 United States School of Knowledge Science Japan Advanced Institute of Science and Technology Ishikawa923-1292 Japan

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Analysis of Splitting Light in a Double-chain of Coupled Metallic Nanowires

Analysis of Splitting Light in a Double-chain of Coupled Met...

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IEEE PhotonicsGlobal@Singapore, IPGC

作者： H.-S. Chu W.-B. Ewe E.-P Li C. Kang Advanced Photonics and Plasmonics Group ASTAR-Institute of High Performance Computing Singapore School of Electrical & Electronic Engineering Nanyang Technological University Singapore

The propagation performances of a double-chain splitter waveguide consists of coupled silver nanowires are investigated for different structures. We show that the efficiency of energy transport along the waveguide and split at a Y-junction due to surface plasmonic coupling is significantly depends on the parameters chosen for the structure such as radius of nanowire, opening angle of splitter and illuminating wavelength. The optimal structure for efficiently guiding and splitting the light at 600 nm is discussed in detail.

关键词： Optical coupling Nanowires Optical waveguides Electromagnetic waveguides Plasmons Optical propagation Silver Optical scattering Optical sensors Biomedical optical imaging

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Editorial: Dependability and security

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IEEE Transactions on Dependable and Secure computing 2008年第1期5卷 1-3页

作者： Iyer, Ravishankar K. Gligor, Virgil D. Kalbarczyk, Zbigniew T. Kanoun, Karama Katzenbeisser, Stefan Mukherjee, Shubu Shieh, Shiuhpyng Zorian, Yervant Department of Electrical and Computer Engineering Carnegie Mellon University Microsoft's Trusted Computing Academic Advisory Board Center for Reliable and High-Performance Computing Coordinated Science Laboratory University of Illinois Urbana-Champaign United States IEEE IEEE Computer Society LAAS CNRS IFIP Working Group 10.4 on Dependable Computing and Fault Tolerance Special Interest Group on Dependability Benchmarking IFIP Working Group 10.4 French SEE Technical Committee on Trustworthy Computer Systems SEE Working Group Design and Validation for Dependability Technical University Munich Germany Darmstadt University of Technology ACM IACR Intel's SER Tech Council Intel's Architecture Patent Committee Taiwan Information Security Center NCTU IEEE Reliability Society Taipei and Tainan IACR United States Virage Logic Corp. AT and T Bell Laboratories Logic Vision Inc. University of British Columbia IEEE Test Technology Technical Council

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Localized image-difference wave-equation tomography 77

Localized image-difference wave-equation tomography

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77th Society of Exploration Geophysicists International Exposition and Annual Meeting, SEG 2007

作者： Maharramov, Musa Albertin, Uwe High Performance Computing Group Exploration and Production Digital and Communications Technology BP HoustonTX77079 United States Advanced Imaging Exploration and Production Technology Group BP HoustonTX77079 United States

ISBN: (纸本)9781604238976

Current wave-equation tomography techniques based on migrated image differences, such as those observed in 4D data sets, use the image difference as a measure of velocity misfit. Computation of the objective function gradient is accomplished by the adjoint application of the derivative of the imaging operator to this image difference. In all techniques developed to date this process is carried out by computing the gradient over a relatively large number of depth steps, and then optimizing the objective function globally over the entire range. In this abstract, we extend this concept to compute the gradient and objective function locally, within several or even one depth step at a time. In principle, for objective functions that are sharply peaked around the global minimum, and have other minima elsewhere, this localization should reduce the possibility of falling into a false minimum, and significantly reduce the number of iterations required in the optimization. In addition, since the velocity is optimized in depth as the extrapolation proceeds, the method is significantly more immune to cycle-skipping at higher frequencies than global methods. © 2007 Society of Exploration Geophysicists. All rights reserved.

关键词： Tomography

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Web Services Interfaces and Open Standards Integration into the European UNICORE 6 Grid Middleware

Web Services Interfaces and Open Standards Integration into ...

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International Workshop on Enterprise Distributed Object computing, EDOCW

作者： M. Riedel B. Schuller D. Mallmann R. Menday A. Streit B. Tweddell M. Shahbaz Memon A. Shiraz Memon B. Demuth T. Lippert D. Snelling S. van den Berghe V. Li M. Drescher A. Geiger G. Ohme A. Vanni C. Cacciari S. Lanzarini P. Malfetti K. Benedyczak P. Bala R. Ratering A. Lukichev Central Institute for Applied Mathematics John von Neumann Institute of Computing Forschungszentrum Julich Julich Germany John von Neumann Inst. for Comput. Forschungszentrum Julich Central Inst. for Appl. Math. Julich Fujitsu Laboratories Limited Hayes UK Solutions for Research T-Systems Corporation Wessling Germany High Performance Computing Department CINECA Bologna Italy Faculty of Mathematics and Computer Science Torun Nicolaus Copernicus University Torun Poland Software and Solutions Group Intel Corporation Bruhl Germany

The UNICORE grid system provides a seamless, secure and intuitive access to distributed grid resources. In recent years, UNICORE 5 is used as a well-tested grid middleware system in production grids (e.g. DEISA, D-Grid) and at many supercomputer centers world-wide. Beyond this production usage, UNICORE serves as a solid basis in many European and International research projects and business scenarios from T-systems, Philips Research, Intel, Fujitsu and others. To foster ongoing developments in multiple projects, UNICORE is open source under BSD license at SourceForge. More recently, the new Web services-based UNICORE 6 has become available that is based on open standards such as the Web services addressing (WS-A) and the Web services resource framework (WS-RF) and thus conforms to the open grid services architecture (OGSA) of the open grid forum (OGF). In this paper we present the evolution from production UNICORE 5 to the open standards-based UNICORE 6 and its various Web services-based interfaces. It describes the interface integration of emerging open standards such as OGSA-BES and OGSA-RUS and thus provides an overview of UNICORE 6.

关键词： Web services Middleware Service oriented architecture Space technology Mathematics Grid computing high performance computing Supercomputers Production facilities Paramagnetic resonance

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