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共 181 条记录，以下是131-140 订阅

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Communication characteristics of large-scale scientific applications for contemporary cluster architectures

Communication characteristics of large-scale scientific appl...

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International symposium on Parallel and Distributed Processing (IPDPS)

作者： J.S. Vetter F. Mueller Center for Applied Scientific Computing Lawrence Livemore National Laboratory Livermore CA USA Department of Computer Science North Carolina State University Raleigh NC USA

This paper examines the explicit communication characteristics of several sophisticated scientific applications, which, by themselves, constitute a representative suite of publicly available benchmarks for large cluster architectures. By focusing on the Message Passing Interface (MPI) and by using hardware counters on the microprocessor, we observe each application's inherent behavioral characteristics: point-to-point and collective communication, and floating point operations. Furthermore, we explore the sensitivities of these characteristics to both problem size and number of processors. Our analysis reveals several striking similarities across our diverse set of applications including the use of collective operations, especially those collectives with very small data payloads. We also highlight a trend of novel applications parting with regimented, static communication patterns in favor of dynamically evolving patterns, as evidenced by our experiments on applications that use implicit linear solvers and adaptive mesh refinement. Overall, our study contributes a better understanding or the requirements of current and emerging paradigms of scientific computing in terms of their computation and communication demands.

关键词： Large-scale systems Application software Computer architecture Scientific computing Message passing Payloads Adaptive mesh refinement Distributed computing Analytical models Laboratories

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Modular HLA RTI services: the GRIDS approach

Modular HLA RTI services: the GRIDS approach

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International Workshop/symposium on Distributed Simulation and Real-Time Applications (DS-RT)

作者： S.J.E. Taylor R. Sudra Centre for Applied Simulation Modelling Department of Information Systems and Computing Brunei University Uxbridge UK

The Generic Runtime Infrastructure for Distributed Simulation (GRIDS) has been developed to investigate modularity issues in distributed simulation. It could be argued that although the HLA RTI is a widespread solution to distributed simulation, it cannot include all possible services. This paper investigates an approach to extending the distributed simulation services available in the HLA RTI. One example of this is bridging support for HLA/DIS legacy integration. This paper therefore presents GRIDS, how GRIDS can be used to provide modular service support for the HLA RTI, and a case study on legacy integration to demonstrate our approach.

关键词： Computational modeling Middleware Runtime Standards development Information systems Distributed computing Grid computing Standardization Stability Job production systems

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Matching criteria for radargrammetry

Matching criteria for radargrammetry

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IEEE International symposium on Geoscience and Remote Sensing (IGARSS)

作者： F. Tupin J.-M. Nicolas Dépt. TSI Ecole Nationale Supérieure des TéIécommunications Paris France

The aim of this paper is to study the use of cross-correlation for radargrammetric applications. Two other criteria derived from the mean square error analysis are proposed. These three criteria are studied first through their distributions computed using simulated data, and secondly when applied on synthetic and real SAR images. Besides, the influence of the use of logarithm or averaged data is studied.

关键词： Random variables Maximum likelihood estimation Mean square error methods Synthetic aperture radar Speckle Optical filters Filtering Image analysis Error analysis Distributed computing

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A recursion-based broadcast paradigm in wormhole routed mesh/torus networks

A recursion-based broadcast paradigm in wormhole routed mesh...

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International symposium on Parallel and Distributed Processing (IPDPS)

作者： Xiaotong Zhuang V. Liberatore Georgia Institute of Technology College of Computing Georgia Institute of Technology Atlanta GA USA Dept EECS Case Western Reserve University Cleveland OH USA

A novel broadcast technique for wormhole-routed mesh and torus parallel computers based on recursion is presented. It works by partitioning the graph into several subgraphs similar to the original one, and identifying a characteristic low-dimensional subgraph from these subgraphs. The source message is first scattered in the characteristic low-dimensional subgraph of the original graph, then through a O(1) number of message transfer and sharing operations, the characteristic low-dimensional subgraphs in each subgraph get the full source message. This procedure continues recursively until the minimum subgraph (a single node) gets all the source message. We have applied this general paradigm to several different cases including the one port/all-port model in mesh/torus with 2 or higher dimension. The network topology can be square or nonsquare, the source node can be located in the corner or not. Comparing to the previous results, our paradigm reduces broadcast latency and is simpler. We also present an analytical comparison of the algorithm against the optimum.

关键词： Broadcasting Intelligent networks Network topology Routing Educational institutions Computer networks Concurrent computing Distributed computing Drives Distributed processing

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Extended Fisherface for face recognition from a single example image per person

Extended Fisherface for face recognition from a single examp...

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IEEE International symposium on Circuits and Systems (ISCAS)

作者： Shiguang Shan Bo Cao Wen Gao Debin Zhao Department of Computer Science Harbin Institute of Technology Harbin China FRJDL Chinese Academy of Sciences Beijing China Institute of Computing Technology Chinese Academy of Sciences Beijing China

ISBN: (纸本)0780374487

We extend Fisherface for face recognition from one example image per person. Fisherface is one of the most successful face recognition methods. However, Fisherface requires several training images for each face, so it cannot be applied to face recognition applications where only one example image per person is available for training. To tackle this problem, we extended the Fisherface method by proposing a method to derive multiple images of a face from one single image. Fisherface is then trained on these derived images. Experimental results on the Bern face database and our 350 subjects database show that our method makes impressive performance improvement compared with the conventional eigenfaces and template matching techniques.

关键词： Face recognition Image databases Lighting Feature extraction Scattering Computer science Business Law enforcement Spatial databases Authentication

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On reliability modeling and analysis of highly-reliable large systems

On reliability modeling and analysis of highly-reliable larg...

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Annual symposium on Reliability and Maintainability (RAMS)

作者： J. Loman Wendai Wang GE Corporate Research and Development Center Schenectady USA

Modem systems are getting more and more complex, incorporating new technology to meet customer's high expectations. Hardware, software and data communications are integrated to make systems function properly. One example is a critical power system, which provides electrical power to a data center or to semiconductor manufacturing equipment. Reliability techniques of fault-tolerance, true redundancy, multiple grid connections, concurrent maintenance and so forth are applied in design to provide high system reliability. The techniques make the system larger and more complicated in configuration and behavior. Application of modeling tools and analysis methods to such highly reliable, large, complex and repairable systems is discussed in this paper, based on the experience of assessing critical power systems. The use of reliability block diagram plus simulation is recommended as one of the best engineering practices in planning for such large complex repairable systems.

关键词： Power system reliability Power system modeling Power system analysis computing Power system planning Power system simulation Modems Hardware Communication system software Data communication Power system faults

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Transfer to/from computing science education: the case of science education research 03

Transfer to/from computing science education: the case of sc...

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Proceedings of the 34th SIGCSE technical symposium on Computer science education

作者： Vicki L. Almstrum David Ginat Orit Hazzan John M. Clement University of Texas at Austin Austin TX Tel Aviv University Tel Aviv Israel Technion - Israel Institute of Technology Haifa Israel St. Pius X High School Houston TX

ISBN: (纸本)9781581136487

During the ITiCSE 2002 conference in Århus, Denmark, a panel presentation on the topic of import to and export from computing Science Education and other fields focused on the case of Mathematics Education Research. The outcome was very successful, with the panelists' presentations giving rise to active audience *** with the theme from the earlier panel, this proposal suggests a similar format with the expanded theme of transfer into computing Science Education from Science Education Research. This panel will look at how research theories developed in the context of various areas of science education can be applied to computing Science Education as well as ways in which computing science educational theories may be used in those areas. Because computing Science Education is a young discipline, it is still in search of its research framework [2]. In formulating such a framework, it can be practical and productive to adapt approaches from research in other disciplines, both educational and related areas. At the same time, the younger discipline can offer innovative new approaches to the older *** panelists will examine possibilities and difficulties in some import and export attempts between several areas of Science Education Research and computing Science Education. For this context, science is considered to include mathematics.

关键词： mathematics education cognition learning theories

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Intelligent Virtual Environment and Camera Control in behavioural simulation

Intelligent Virtual Environment and Camera Control in behavi...

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Brazilian symposium on Computer Graphics and Image Processing (SIBGRAPI)

作者： F. Pereira Ferreira G. Gelatti S. Raupp Musse UNISINOS PIPCA Masters in Applied Computing Sao Leopoldo Brazil

This paper presents a model describing intelligent information present in the virtual environment, as well as camera control. We are interested in modeling intelligent virtual environments, integrated with intelligent camera control in order to provide information to be used in behavioural simulations. Our main goal is to be able to populate virtual environments with virtual agents endowed with different levels of autonomy: from guided to autonomous.

关键词： Virtual environment Smart cameras Integrated circuit modeling Autonomous agents Visualization Computational modeling Discrete event simulation Intelligent control Humans Solid modeling

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Low-sensitivity active-RC high- and band-pass second-order Sallen & Key allpole filters

Low-sensitivity active-RC high- and band-pass second-order S...

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IEEE International symposium on Circuits and Systems (ISCAS)

作者： D. Jurisic G.S. Moschytz N. Mijat Faculty of Electrical Engineering and Computing Zagreb Croatia Swiss Federal Institute of Technology Zurich Switzerland

The design procedure of low-sensitivity, low-pass (LP) 2/sup nd/- and 3/sup rd/-order class-4 Sallen and Key active resistance-capacitance (RC) allpole filters, using impedance tapering, has already been published. In this paper desensitization using impedance tapering is applied to HP and BP 2/sup nd/-order filters. It is shown that HP filters have dual properties to LP filters in the sense of sensitivity. Among various topologies of BP filters, the best topology is proposed. The sensitivity of a filter transfer function to component tolerances is examined using the Schoeffler sensitivity measure as a basis for comparison. Monte Carlo runs are performed as a double-check. The component values, selected for impedance tapering, account for the considerable decrease in sensitivities to component tolerances for the LP as well as for the HP and BP filters.

关键词： Band pass filters Impedance Transfer functions Topology Monte Carlo methods Feedback circuits H infinity control Resistors Capacitors Frequency

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Automatic gender identification by speech signal using eigenfiltering based on Hebbian learning

Automatic gender identification by speech signal using eigen...

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Brazilian symposium on Neural Networks

作者： R.D.R. Fagundes A.A.C. Martins F. Comparsi de Castro M.C. Felippetto de Castro Pontifícia Universidade Católica do Rio Grande do Sul –PUCRS Signals Systems and Computing Laboratory – SISC Porto Alegre RS Brazil Pontificia Universidade Catolica do Rio Grande do Sul Porto Alegre RS BR Signals Syst. & Comput. Lab. Pontificia Univ. Catolica do Rio Grande do Sul Porto Alegre Brazil

This work presents an automatic gender identification algorithm based on eigenfiltering. A maximum eigenfilter is implemented by means of an artificial neural network (ANN) trained via generalized Hebbian learning. The eigenfilter uses the principal component analysis to perform maximum information extraction from the speech signal, which enhances correlated information and improves the pattern analysis. Also, a well known speech processing technique is applied, the mel-frequency cepstral coefficients. This technique is a classical approach for speech feature extraction, and it is a very efficient way to represent physiological voice parameters. The pattern classification uses a radial basis function neural network. Experimental results have shown that the identification algorithm overall performance was widely increased by the eigenfiltering process.

关键词： Signal processing Hebbian theory Artificial neural networks Principal component analysis Data mining Speech enhancement Speech analysis Pattern analysis Speech processing Cepstral analysis

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