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Proceedings of the conference on Visualization '99: celebrating ten years

作者： Nivedita Sahasrabudhe John E. West Raghu Machiraju Mark Janus NSF Engineering Research Center Mississippi State University DoD High Performance Computing Center Information Technology Laboratory USAE Waterways Experiment Station and NSF Engineering Research Center Mississippi State University Department of Computer Science NSF Engineering Research Center Mississippi State University Department of Aerospace Engineering NSF Engineering Research Center Mississippi State University

ISBN: (纸本)9780780358973

Often, images or datasets have to be compared, to facilitate choices of visualization and simulation parameters respectively. Common comparison techniques include side-by-side viewing and juxtaposition, in order to facilitate visual verification of verisimilitude. In this paper, we propose quantitative techniques which accentuate differences in images and datasets. The comparison is enabled through a collection of partial metrics which, essentially, measure the lack of correlation between the datasets or images being compared. That is, they attempt to expose and measure the extent of the inherent structures in the difference between images or datasets. Besides yielding numerical attributes, the metrics also produce images, which can visually highlight differences. Our metrics are simple to compute and operate in the spatial domain. We demonstrate the effectiveness of our metrics through examples for comparing images and datasets.

关键词： correlation measure rendering metrics steering

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Multivariate Geographic Clustering in A Metacomputing Environment Using Globus

Multivariate Geographic Clustering in A Metacomputing Enviro...

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Supercomputing Conference

作者： G. Mahinthakumar F.M. Hoffman W.W. Hargrove N.T. Karonis Oak Ridge National Laboratory Center for Computational Sciences Oak Ridge TN USA Environmental Sciences Division Oak Ridge National Laboratory Oak Ridge TN USA Energy Environment and Resources Center Systems Development Institute University of Tennessee Knoxville TN USA High Performance Computing Laboratory Department of Computer Science Northern Illinois University Dekalb IL USA

The authors present a metacomputing application of multivariate, nonhierarchical statistical clustering to geographic environmental data from the 48 conterminous United States in order to produce maps of regions of ecological similarity, called ecoregions. These maps represent finer scale regionalizations than do those generated by the traditional technique: an expert with a marker pen. Several variables (e.g., temperature, organic matter, rainfall etc.) thought to affect the growth of vegetation are clustered at resolutions as fine as one square kilometer (1 km2). These data can represent over 7.8 million map cells in an n-dimensional (n = 9 to 25) data space. A parallel version of the iterative statistical clustering algorithm is developed by the authors using the MPI (Message Passing Interface) message passing routines. The parallel algorithm uses a classical, self-scheduling, single-program, multiple data (SPMD) organization; performs dynamic load balancing for reasonable performance in heterogeneous metacomputing environments; and provides fault tolerance by saving intermediate results for easy restarts in case of hardware failure. The parallel algorithm was tested on various geographically distributed heterogeneous metacomputing configurations involving an IBM SP3TM, an IBM SP2TM, and two SGI Origin 2000TM ’s. The tests were performed with minimal code modification, and were made possible by GlobusTM (a metacomputing software toolkit) and the Globus-enabled version of MPI (MPICH-G). Our performance tests indicate that while the algorithm works reasonably well under the metacomputing environment for a moderate number of processors, the communication overhead can become prohibitive for large processor configurations.

关键词： Metacomputing Message passing Parallel algorithms Testing Temperature Vegetation mapping Clustering algorithms Iterative algorithms Load management Fault tolerance

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Multivariate geographic clustering in a metacomputing environment using Globus 99

Multivariate geographic clustering in a metacomputing enviro...

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Proceedings of the 1999 ACM/IEEE conference on Supercomputing

作者： G. Mahinthakumar Forrest M. Hoffman William W. Hargrove Nicholas T. Karonis Oak Ridge National Laboratory Center for Computational Sciences P.O. Box 2008 Oak Ridge TN Oak Ridge National Laboratory Environmental Sciences Division P.O. Box 2008 Oak Ridge TN University of Tennessee Energy Environment and Resources Center Systems Development Institute 10521 Research Drive Suite 100 Knoxville TN High Performance Computing Laboratory Department of Computer Science Northern Illinois University Dekalb IL

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A review of tele-immersive applications in the CAVE research network

A review of tele-immersive applications in the CAVE research...

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IEEE Annual International Symposium Virtual Reality

作者： J. Leigh A.E. Johnson T.A. DeFanti M. Brown M.D. Ali S. Bailey A. Banerjee P. Benerjee Jim Chen K. Curry J. Curtis F. Dech B. Dodds I. Foster S. Fraser K. Ganeshan D. Glen R. Grossman R. Heiland J. Hicks A.D. Hudson T. Imai M.A. Khan A. Kapoor R.V. Kenyon J. Kelso R. Kriz C. Lascara X. Liu Y. Lin T. Mason A. Millman K. Nobuyuki K. Park B. Parod P.J. Rajlich M. Rasmussen M. Rawlings D.H. Robertson S. Thongrong R.J. Stein K. Swartz S. Tuecke H. Wallach Hong Yee Wong G.H. Wheless National Center for Supercomputing Applications University슠of슠Illinois Urbana-Champaign USA Electronic Visualization Laboratory University of Illinois Chicago USA National Center for Data-Mining University of Illinois Chicago USA Industrial Virtual Reality Laboratory University of Illinois Chicago USA Northwestern University USA Virginia Tech Antenna Group USA Searle Argonne National Laboratory USA Purdue University Indiana University USA Center for Coastal Physical Oceanography Old Dominion University USA Institute of High Performance Computing National University of Singapore Singapore Virtual Reality in Medicine Laboratory University of Illinois Chicago USA Tohwa University Japan

This paper presents an overview of the tele-immersion applications that have been built by collaborators around the world using the CAVERNsoft toolkit, and the lessons learned from building these applications. In particular the lessons learned are presented as a set of rules-of-thumb for developing tele-immersive applications in general.

关键词： Intelligent networks Laboratories Visualization Virtual reality Collaborative work Virtual environment Image databases Industrial training Computer networks Sea measurements

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On equilibration and sparse factorization of matrices arising in finite element solutions of partial differential equations

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Numerical Methods for Partial Differential Equations 1999年第1期16卷

作者： Valmor F. de Almeida Andrew M. Chapman Jeffrey J. Derby Department of Chemical Engineering and Materials Science Army High Performance Computing Research Center and Minnesota Supercomputer Institute University of Minnesota Minneapolis MN 55455-0132 NEC Systems Inc. 4200 Research Forest #400 The Woodlands TX 77381

Investigations of scaling and equilibration of general matrices have been traditionally aimed at the effects on the stability and accuracy of LU factorizations—the so-called scaling problem. Notably, Skeel (1979) concludes that no systematic scaling procedure can be concocted for general matrices exempt from the danger of disastrous effects. Other researchers suggest that scaling procedures are not beneficial and should be abandoned altogether. Stability and accuracy issues notwithstanding, we show that this unglamorous technique has a profound impact on the sparsity of the resulting LU factors. In the modern era of fast computing, equilibration can play a key role in constructing incomplete sparse factorizations to solve a problem unstably, but quickly and iteratively . This article presents practical evidence, on the basis of sparsity, that scaling is an indispensable companion for sparse factorization algorithms when applied to realistic problems of industrial interest. In light of our findings, we conclude that equilibration with the ∞-norm is superior than equilibration with the 2-norm. © 2000 John Wiley & Sons, Inc. Numer Methods Partial Differential Eq 16: 11–29, 2000

关键词： matrix equilibration scaling incomplete LU factorization pivoting preconditioning sparse finite-element matrices incompressible fluids Navier-Stokes equations

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A cyclic symmetry analysis for turbomachine blade flutter

A cyclic symmetry analysis for turbomachine blade flutter

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ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition, GT 1998

作者： Chiang, Hsiao-Wei D. Chung, Meng-Hsuan Center for Aviation and Space Technology Industrial Technology Research Institute United States Division of Research and Promotion National Center for High-Performance Computing United States

ISBN: (纸本)9780791878668

A frequent cause of turbomachinery blade failure is excessive vibration due to flutter or forced response. One method for dealing with this problem is to increase blade structural damping using either tip or mid-span shroud designs. Unfortunately, most existing aeroelastic analyses deal with a blade alone model which can not be used for system mode analysis. Therefore, judgments based on past experience are used to determine the acceptability of a shrouded blade design. A new cyclic symmetry analysis has been developed to predict shrouded blade flutter. The method provides a system approach, over and above the standard blade alone approach, for predicting potential aeroelastic problems. Using the blade natural frequencies and mode shapes from a cyclic symmetry finite element model, the unsteady aerodynamic forces of the system mode are calculated. A cyclic symmetry flutter analysis is then performed. This analysis has been applied to a typical shrouded fan blade to investigate blade flutter. The predicted system mode flutter demonstrated that the blade alone analysis can be non-conservative. Copyright © 1998 by ASME All Rights Reserved.

关键词： Finite element method

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A Semicustom masterslice synthesisor

A Semicustom masterslice synthesisor

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1998 3rd International Conference on ASIC

作者： Chen Lan Tang Zhiming Center of High Performance Computer Institute of Computing Technology Chinese Academy of Science

A synthesisor used to generate Gate Array's, FPGA 's,or CPLD 's masterslice is *** includes the abstraction of the common system model of these semicustom IC's basewafer and the synthesising algorithm which is structure cells binary generating tree *** time complexity of the synthesising algorithm is O（logn）.where n is the number of the nodes of the structure cells binary generating tree.

关键词： Semi-custome masterslice Synthesisor Structure cells binary generating treee Structure graphic of placement

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Transporting Design Data on Netlist Level——A Practical Application Example

Transporting Design Data on Netlist Level——A Practical App...

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1998 3rd International Conference on ASIC

作者： Chen Lan Tang Zhiming Center of High Performance Computer Institute of Computing Technology Chinese Academy of Sciences

Tht transportability of IC design data is becoming more and more important today for design reusable. This means that tht EDA tools should be able to accept the third part design *** right now almost all EDA tools vendor applied that their EDA tools can accept the industry standard EDA design data format,there arc still a lot of work must to be done first when a set of design data which has been finished with ont EDA tools will be reused in a new EDA tools which is different from the original *** an example ICT-R1455,this paper introduced a sheme that use tht third part design data which has already be *** EDA tools we used are CADENCE for simulation and MAX+PLUS H for Altera FPGA developing. The ICT-R1455 teas realized on Altera FPGA EPF10kRC240-3 with 40%gates usage.

关键词： Transportability of design data EDIF(Electronic Data Interchange Format) netlist design level

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Multi-spectral shocklayer radiance from a hypersonic slender body 33rd

Multi-spectral shocklayer radiance from a hypersonic slender...

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33rd Thermophysics Conference, 1999

作者： Levin, Deborah A. Candler, Graham V. Limbaugh, Charles C. Department of Chemistry George Washington University WashingtonDC20052 United States Department of Aerospace Engineering and Mechanics Army High Performance Computing Research Center University of Minnesota MinneapolisMN55455 United States Sverdrup Technology Inc AEDC Division Arnold Air Force Base TN37388-9013 United States

This paper presents a methodology for the calculation of the IR shocklayer radiance from a slender hypersonic vehicle. An overlay technique that has been successfully employed for chemically reacting hypersonic compressed and expanding flows has been extended to accurately model the vibrational state distributions of NO, CO, water and CO2, which are potential shocklayer radiators in the midwave infra-red. The spectral predictions show that radiation from shock heated ambient CO2 will be an important contribution at most altitudes and speeds slower than 3.5 km/set. A detailed vibrational statespecific model of CO2 excitation has been incorporated with the flow modeling using an overlay technique. Comparisons of the spatial distributions of CO2 vibrational states with a corresponding Boltzmann distribution at the translational temperature show that there are substantial differences in the populations. These predictions are important for the design of an upcoming sounding rocket experiment. © 1999, American institute of Aeronautics and Astronautics, Inc.

关键词： Hypersonic vehicles

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A hierarchical approach for dependability analysis of a commercial cache-based RAID storage architecture

A hierarchical approach for dependability analysis of a comm...

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International Symposium on Fault-Tolerant computing (FTCS)

作者： M. Kaaniche L. Romano Z. Kalbarczyk R. Iyer R. Karcich LAAS CNRS Toulouse France Center for Reliable and High Performance Computing University of Illinois Urbana-Champaign Urbana IL USA Storage Technology Corporation Louisville CO USA

We present a hierarchical simulation approach for the dependability analysis and evaluation of a highly available commercial cache-based RAID storage system. The architecture is complex and includes several layers of overlapping error detection and recovery mechanisms. Three abstraction levels have been developed to model the cache architecture, cache operations, and error detection and recovery mechanism. The impact of faults and errors occurring in the cache and in the disks is analyzed at each level of the hierarchy. A simulation submodel is associated with each abstraction level. The models have been developed using DEPEND, a simulation-based environment for system-level dependability analysis, which provides facilities to inject faults into a functional behavior model, to simulate error detection and recovery mechanisms, and to evaluate quantitative measures. Several fault models are defined for each submodel to simulate cache component failures, disk failures, transmission errors, and data errors in the cache memory and in the disks. Some of the parameters characterizing fault injection in a given submodel correspond to probabilities evaluated from the simulation of the lower-level submodel. Based on the proposed methodology, we evaluate and analyze: the system behavior under a real workload and high error rate (focusing on error bursts); the coverage of the error detection mechanisms implemented in the system and the error latency distributions; and the accumulation of errors in the cache and in the disks.

关键词： Cache storage Error correction Analytical models Delay Fault detection Error analysis performance analysis Fault tolerance Computer architecture Computational modeling

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