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The performance of GRAPE-DR for dense matrix operations

Procedia computer science 2011年 4卷 888-897页

作者： Junichiro Makino Hiroshi Daisaka Toshiyuki Fukushige Yutaka Sugawara Mary Inaba Kei Hiraki Center for Computational Astrophysics National Astronomical Observatory of Japan Mitaka Tokyo 181-8588 Faculty of Commerce and Management Hitotsubashi University Kunitachi Tokyo 186-8601 K&F Computing Research Chofu Tokyo 182-0026 Department of Computer Science Graduate School of Information Science and Technology The University of Tokyo Tokyo 133-0033

We describe the implementation and performance of dense matrix multiplication and LU decomposition on the GRAPE-DR SIMD accelerator board. A GRAPE-DR card, with 4 GRAPE-DR chips, has the theoretical peak DP performance of 819 Gflops. Each GRAPE-DR chip has 512 processing elements and operates with 400 MHz clock cycle. each PE can perform one addition and one multiplication in every two clock cycles. The measured performance of matrix multiplication is 730 Gflops for the multiplication of matrices with size 51200 by 2048 and 2048 by 51200. The performance of LU decomposition is 480 Gflops for the problem size of 51200.

关键词： Numerical methods 02.60.-x

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DigiScope - Unobtrusive Collection and Annotating of Auscultations in Real Hospital Environments

DigiScope - Unobtrusive Collection and Annotating of Auscult...

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society

作者： D. Pereira F. Hedayioglu R. Correia T. Silva I. Dutra F. Almeida S. S. Mattos M. Coimbra Center for Research in Health Technologies and Information Systems (CINTESIS) Faculty of Medicine University of Porto Instituto de Telecomunicacoes (IT) Department of Computer Science Faculty of Science University of Porto Health Information and Decision Sciences Department (CIDES) and the Center for Research in Health Technologies and Information Systems (CINTESIS) Faculty of Medicine University of Porto Instituto de Engenharia de Sistemas e Computadores - Porto (INESC-Porto) and the Center for Research in Advanced Computing Systems (CRACS) Department of Computer Science Faculty of Science University of Porto Unidade de Cardiologia e Medicina Fetal Real Hospital Portugues

ISBN: (纸本)9781424441211

Digital stethoscopes are medical devices that can collect, store and sometimes transmit acoustic auscultation signals in a digital format. These can then be replayed, sent to a colleague for a second opinion, studied in detail after an auscultation, used for training or, as we envision it, can be used as a cheap powerful tool for screening cardiac pathologies. In this work, we present the design, development and deployment of a prototype for collecting and annotating auscultation signals within real hospital environments. Our main objective is not only pave the way for future unobtrusive systems for cardiac pathology screening, but more immediately we aim to create a repository of annotated auscultation signals for biomedical signal processing and machine learning research. The presented prototype revolves around a digital stethoscope that can stream the collected audio signal to a nearby tablet PC. Interaction with this system is based on two models: a data collection model adequate for the uncontrolled hospital environments of both emergency room and primary care, and a data annotation model for offline metadata input. A specific data model was created for the repository. The prototype has been deployed and is currently being tested in two Hospitals, one in Portugal and one in Brazil.

关键词： Auscultation Hospital environment medical signal processing audio signals hospital WAREHOUSE Second Opinion Stethoscopes data models Medical device emergency room PROTOTYPE

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面向并行文件系统的性能评估及相对预测模型

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软件学报 2011年第9期22卷 2206-2221页

作者：赵铁柱董守斌 Verdi MARCH Simon SEE 华南理工大学广东省计算机网络重点实验室广东广州510641 五邑大学计算机学院广东江门529020 Technical and Cloud Computing Center Oracle Corporation Department of Computer Science National University of Singapore Department of Mechanical&Aerospace Engineering Nanyang Technological University

基于Lustre文件系统，对并行文件系统的性能评估和性能建模进行了研究．通过对性能因子的调研，进行了一系列性能评估实验，并提出性能相关性模~（PRModel）．在实验评估和PRModel分析中发现，在不同的性能因子之间存在着紧密的性能相... 详细信息

基于Lustre文件系统，对并行文件系统的性能评估和性能建模进行了研究．通过对性能因子的调研，进行了一系列性能评估实验，并提出性能相关性模~（PRModel）．在实验评估和PRModel分析中发现，在不同的性能因子之间存在着紧密的性能相关性，为了挖掘并利用这种相关性信息，提出了一种相对性能预测模（RPPModel）来预测不同性能因子条件下的性能．为了验证RPPModel的有效性，设计了大量实验用例．结果表明，预测结果的平均相对误差能够控制在170／o---28％的范围内，易于使用且具有较好的预测准确度．

关键词：并行文件系统性能评估性能模型 Lustre文件系统

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics): Preface

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2011年 6844 LNCS卷 VI页

作者： Dehne, Frank Iacono, John Sack, Jörg-Rüdiger Carleton University School of Computer Science Parallel Computing and Bioinformatics Laboratory 1125 Colonel By Drive Ottawa ON K1S 5B6 Canada Polytechnic Institute of New York University Department of Computer Science and Engineering 5 MetroTech. Center New York NY 11201 United States Carleton University School of Computer Science Herzberg Laboratories 1125 Colonel By Drive Ottawa ON K1S 5B6 Canada

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CDRAS: An approach to dealing with Man-in-the-Middle attacks in the context of voice over IP

CDRAS: An approach to dealing with Man-in-the-Middle attacks...

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2011 6th International Conference on Availability, Reliability and Security, ARES 2011

作者： Hofbauer, Stefan Quirchmayr, Gerald Wills, Christopher C. Danube Data Center GmbH Network Department Floridsdorfer Hauptstrasse 1 1210 Vienna Austria University of Vienna Multimedia Information Systems Research Group Liebiggasse 4/3-4 1010 Vienna Austria University of South Australia Division of Information Technology School of Computer and Information Science Mawson Lakes SA 5095 Australia University of South Australia Division of Information Technology School of Computer and Information Science GPO Box 2471 Adelaide SA 5001 Australia Kingston University Faculty of Computing Information Systems and Mathematics Penrhyn Road Surrey KT1 2EE London United Kingdom

ISBN: (纸本)9780769544854

This paper describes the CDRAS (Call Detail Records Analysis System) system, the motivation behind it, its approach and its background. The system aims at dealing with the notorious Man-in-the-Middle attack in the context of VoIP. As the use of such a system constitutes leads to an interference with the privacy of users, the most relevant legal aspects related to this work are also briefly discussed. © 2011 IEEE.

关键词： Voice/data communication systems

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Principles of genomic robustness inspire fault-tolerant WSN topologies: A network science based case study

Principles of genomic robustness inspire fault-tolerant WSN ...

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IEEE Annual Conference on Pervasive computing and Communications Workshops (PerCom)

作者： Preetam Ghosh Michael Mayo Vijender Chaitankar Tanwir Habib Ed Perkins Sajal K Das School of Computing University of Southern Mississippi Hattiesburg MS USA Environmental Laboratory U.S. Army Engineer Research and Development Center Vicksburg MS USA Department Computer Science & Engineering University of Texas Arlington Arlington TX USA

Wireless sensor networks (WSNs) are frameworks for modern pervasive computing infrastructures, and are often subject to operational difficulties, such as the inability to effectively mitigate signal noise or sensor failure. Natural systems, such as gene regulatory networks (GRNs), participate in similar information transport and are often subject to similar operational disruptions (noise, damage, etc.). Moreover, they self-adapt to maintain system function under adverse conditions. Using a PBN-type model valid in the operational and functional overlap between GRNs and WSNs, we study how attractors in the GRN-the target state of an evolving network-behave under selective gene or sensor failure. For “larger” networks, attractors are “robust”, in the sense that gene failures (or selective sensor failures in the WSN) conditionally increase their total number; the “distance” between initial states and their attractors (interpreted as the end-to-end packet delay) simultaneously decreases. Moreover, the number of attractors is conserved if the receiving sensor returns packets to the transmitting node; however, the distance to the attractors increases under similar conditions and sensor failures. Interpreting network state-transitions as packet transmission scenarios may allow for trade-offs between network topology and attractor robustness to be exploited to design novel fault-tolerant routing protocols, or other damage-mitigation strategies.

关键词： Wireless sensor networks Boolean functions Robustness Routing protocols Delay Topology

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Astrophysical particle simulations with large custom GPU clusters on three continents

Astrophysical particle simulations with large custom GPU clu...

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作者： Spurzem, R. Berczik, P. Berentzen, I. Nitadori, K. Hamada, T. Marcus, G. Kugel, A. Männer, R. Fiestas, J. Banerjee, R. Klessen, R. National Astronomical Observatories of China Chinese Academy of Sciences 20A Datun Rd. Chaoyang District Beijing 100012 China University of Heidelberg Mönchhofstr. 12-14 69120 Heidelberg Germany Nagasaki Advanced Computing Center University of Nagasaki RIKEN Institute Tokyo Japan Department of Computer Science V Central Inst. of Computer Engineering University of Heidelberg Heidelberg Germany University of Heidelberg Heidelberg Germany Main Astronomical Observatory National Academy of Sciences of Ukraine MAO/NASU 27 Akademika Zabolotnoho St. 03680 Kyiv Ukraine

We present direct astrophysical N-body simulations with up to six million bodies using our parallel MPICUDA code on large GPU clusters in Beijing, Berkeley, and Heidelberg, with different kinds of GPU hardware. The clusters are linked in the cooperation of ICCS (International center for Computational science). We reach about one third of the peak performance for this code, in a real application scenario with hierarchically block time-steps and a core-halo density structure of the stellar system. The code and hardware is used to simulate dense star clusters with many binaries and galactic nuclei with supermassive black holes, in which correlations between distant particles cannot be neglected. © Springer-Verlag 2011.

关键词： computer hardware

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Supporting the combination and integration of multiple standards and models

Supporting the combination and integration of multiple stand...

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Colombian Conference on computing (CCC)

作者： César Pardo Francisco J. Pino Félix García Mario Piattini Maria Teresa Baldasarre IDIS Research Group University of Cauca Colombia Advanced Computing Technologies University of Castilla La Mancha Spain Department of Systems Engineering University of Cauca Colombia Computer Science University of Castilla La Mancha Spain Alarcos Quality Center s.l. a spinoff of the Alarcos Research Group University of Castilla La Mancha Spain Computer Science University of Bari Italy

There is growing interest in defining best practices that support multiple needs in companies. This has led to the current situation, where organizations, universities and research groups, amongst others, have defined a wide range of reference models. This is also known as the quagmire of standards and models. The ample assortment of possibilities enables companies to choose and implement the models that are most suitable for their particular features. There may even be a reduction in the cost associated with effort and time in their implementation. Each model, however, defines its own process structure, approach, scope, and so forth, so carrying out the implementation of more than two models without guidelines or suitable tools can be a hard, if not impossible, task. With all this in mind, the aim of this paper is to present a harmonization Framework, which establishes the elements and tools needed to support the harmonization of multiple reference models. It also presents a detailed summary of the elements defined, along with a summary of the successful application of the harmonization framework in two case studies. This harmonization framework and its elements have been shown to be suitable for supporting the harmonization of multiple models.

关键词： ISO standards Educational institutions Software Companies Software engineering computers

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Geometry-aware video registration

Geometry-aware video registration

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15th International Workshop on Vision, Modeling and visualization, VMV 2010

作者： Palma, Gianpalo Callieri, Marco Dellepiane, Matteo Corsini, Massimiliano Scopigno, Roberto Department of Computer Science University of Pisa Italy Visual Computing Lab. ISTI-CNR Pisa Italy

ISBN: (纸本)9783905673791

We present a new method for the accurate registration of video sequences of a real object over its dense triangular mesh. The goal is to obtain an accurate video-to-geometry registration to allow the bidirectional data transfer between the 3D model and the video using the perspective projection defined by the camera model. Our solution uses two different approaches: feature-based registration by KLT video tracking, and statistic-based registration by maximizing the Mutual Information (MI) between the gradient of the frame and the gradient of the rendering of the 3D model with some illumination related properties, such as surface normals and ambient occlusion. While the first approach allows a fast registration of short sequences with simple camera movements, the MI is used to correct the drift problem that KLT tracker produces over long sequences, due to the incremental tracking and the camera motion. We demonstrate, using synthetic sequences, that the alignment error obtained with our method is smaller than the one introduced by KLT, and we show the results of some interesting and challenging real sequences of objects of different sizes, acquired under different conditions. © The Eurographics Association 2010.

关键词： Data transfer

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Improving 2D-3D registration by mutual information using gradient maps

Improving 2D-3D registration by mutual information using gra...

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8th Eurographics Italian Chapter Conference 2010

作者： Palma, Gianpaolo Corsini, Massimiliano Dellepiane, Matteo Scopigno, Roberto Department of Computer Science University of Pisa Italy Visual Computing Lab. ISTI-CNR Pisa Italy

ISBN: (纸本)9783905673807

In this paper we propose an extension for the algorithms of image-to-geometry registration by Mutual Information(MI) to improve the performance and the quality of the alignment. Proposed for the registration of multi modal medical images, in the last years MI has been adapted to align a 3D model to a given image by using different renderings of the model and a gray-scale version of the input image. A key aspect is the choice of the rendering process to correlate the 3D model to the image without taking into account the texture data and the lighting conditions. Even if several rendering types for the 3D model have been analyzed, in some cases the alignment fails for two main reasons: the peculiar reflection behavior of the object that we are not able to reproduce in the rendering of the 3D model without knowing the material characteristics of the object and the lighting conditions of the acquisition environment;the characteristics of the image background, especially non uniform background, that can degrade the convergence of the registration. To improve the quality of the registration in these cases we propose to compute the MI between the gradient map of the 3D rendering and the gradient map of the image in order to maximize the shared data between them. © The Eurographics Association 2010.

关键词： Lighting

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