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检索条件"任意字段=Proceedings of the IEEE 2001 symposium on parallel and large-data visualization and graphics"

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Towards a parallel data mining toolbox 15

Towards a parallel data mining toolbox

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15th International parallel and Distributed Processing symposium, IPDPS 2001

作者： Christen, P. Hegland, M. Nielsen, O.M. Roberts, S. Strazdins, P. Semenova, T. Altas, Irfan Hancock, Timothy Australian National University CanberraACT0200 Australia Charles Sturt University Wagga WaggaNSW2678 Australia James Cook University TownsvilleQLD4811 Australia

ISBN: (纸本)0769509908

This paper presents research projects tackling two aspects in data mining. First, a toolbox is discussed that allows flexible and interactive data exploration, analysis and presentation using the scripting language Python. The advantages of this toolbox are that it provides the functionality to process multiple SQL queries in parallel, and enables fast data retrieval using a supervised caching mechanism for commonly used queries. These two facets of the toolbox allow for fast, efficient data access reducing the time spent on data exploration, preparation and analysis. Secondly, an approach to predictive modelling is presented that leads to scalable parallel algorithms for high dimensional data collections. This is an essential requirement for data mining algorithms as those that do not scale linearly with the data size are infeasible. These algorithms are implemented in parallel and achieve an almost ideal speedup for their respective implementations. One aim of the presented research is to integrate and combine these two different aspects of data mining into an efficient but flexible data mining toolbox that allows the experienced data miner to attack large scale problems interactively or with batch processing. © 2001 ieee.

关键词： data mining

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Scalable isosurface visualization of massive datasets on COTS clusters 01

Scalable isosurface visualization of massive datasets on COT...

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proceedings of the ieee 2001 symposium on parallel and large-data visualization and graphics

作者： Xiaoyu Zhang Chandrajit Bajaj William Blanke TICAM University of Texas at Austin University of Texas at Austin

ISBN: (纸本)9780780372238

Our scalable isosurface visualization solution on a commodity off-the-shelf cluster is an end-to-end parallel and progressive platform, from the initial data access to the final display. In this paper we focus on the back end scalability by introducing a fully parallel and out-of-core isosurface extraction algorithm. It partitions the volume data according to its workload spectrum for load balancing and creates an I/O-optimal external interval tree to minimize the number of I/O operations of loading large data from disk. It achieves scalability by using both parallel processing and parallel disks. Interactive browsing of extracted isosurfaces is made possible by using parallel isosurface extraction and rendering in conjunction with a new specialized piece of image compositing hardware called the Metabuffer. We also describe an isosurface compression scheme that is efficient for isosurface processing.

关键词： Metabuffer Multi-resolution parallel and Out-of-core Isocontouring parallel Rendering Progressive mesh

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Overview of security considerations for computational and data Grids

Overview of security considerations for computational and da...

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10th Annual ieee International symposium on High Performance Distributed Computing

作者： Johnston, WE Jackson, KR Talwar, S NASA Ames Res Ctr Lawrence Berkeley Natl Lab Berkeley CA USA

ISBN: (纸本)0769512968

large-scale science and engineering is frequently done through the interaction of collaborating groups, heterogeneous computing resources, information systems, and instruments, all of which are geographically and organizationally dispersed. The overall motivation for "Grids" is to enable the routine interactions of these resources to enhance this type of large-scale science and engineering, and thus substantially increase the computing and data handling capabilities available to science and engineering projects. However, even if this environment works in every other way, it will not be viable if it is constantly disrupted by hackers and their kin. Distributed applications are potentially more vulnerable than conventional scientific problem solving environments because there are substantially more targets to attack in order to impact a single application. Much of the overall security of Grids is inherited from the security of the underlying systems. There are, however, some security considerations at the Grid level that are independent of the underlying systems, and we focus on this later aspect.

关键词： parallel processing systems

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Comparison of remote visualization strategies for interactive exploration of large data sets

Comparison of remote visualization strategies for interactiv...

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International symposium on parallel and Distributed Processing (IPDPS)

作者： L.A. Freitag R.M. Loy Mathematics and Computer Science Division Argonne National Laboratory Argonne IL USA ASCI Flash Center University of Chicago Chicago IL USA

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parallel 2D Delaunay triangulations in HPP and MPI 15

Parallel 2D Delaunay triangulations in HPP and MPI

引用

15th International parallel and Distributed Processing symposium, IPDPS 2001

作者： Chen, Min-Bin Chuang, Tyng-Ruey Wu, Jan-Jau Institute of Information Science Academia Sinica Nankang Taipei115 Taiwan

ISBN: (纸本)0769509908

This paper reports on efficient parallel implementations of two-dimensional Delaunay triangulation in High Performance Fortran (HPF) and in Message Passing Interface (MPI). Our parallelization algorithm performs subblock triangulation and boundary merge independently at the same time. The sub-block triangulation is by a divide & conquer Delaunay algorithm known for its sequential efficiency, and the boundary triangulation is by an incremental construction algorithm with low overhead. Compared to prior work, our parallelization method is both simple and efficient. In the paper we also describe a solution to the collinear points problem that usually arises in large data sets for divide & conquer algorithm. Our experiences with the HPF implementation show that with careful control of the data distribution, we are able to parallelize the program using HPF's standard directives and extrinsic procedures. Experimental results on several parallel platforms, including an IBM SP2 and a DEC Alpha farm, show that a parallel efficiency of 31%-59% can be achieved for an 8-node distributed memory system. We also compare efficiency of the HPF implementation to that of a similarly hand-coded MPI implementation. © 2001 ieee.

关键词： Message passing

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Case study: parallel lagrangian visualization applied to natural convective flows 01

Case study: parallel lagrangian visualization applied to nat...

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proceedings of the ieee 2001 symposium on parallel and large-data visualization and graphics

作者： L. M. de la Cruz I. García V. Godoy E. Ramos Universidad Nacional Autönoma de México

ISBN: (纸本)9780780372238

This paper presents a visualization technique based on particle tracking. The technique consists in defining a set of points distributed on a closed surface and follow the surface deformations as the velocity field changes in time. Deformations of the surface contains information about dynamics of the flow; in particular, it is possible to identify zones where flow stretching and foldings occur. Because the points on the surface are independent each other, it is possible to calculate the trajectory of each point concurrently. Two parallel algorithms are studied; the first one for a shared memory Origin 2000 supercomputer and the second one for a distributed memory PC cluster. The technique is applied to a fluid moving by natural convection inside a cubic container.

关键词： shared distributed memory pathlines Flow visualization particle traces

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Pixel bar charts: a new technique for visualizing large multi-attribute data sets without aggregation

Pixel bar charts: a new technique for visualizing large mult...

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ieee symposium on Information visualization (INFOVIS)

作者： D. Keim M.C. Hao J. Ladisch Meichun Hsu U. Dayal Computer Science Institute University of Constance Constance Germany Hewlett Packard Laboratories Palo Alto CA USA

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Real-time out-of-core visualization of particle traces 01

Real-time out-of-core visualization of particle traces

引用

proceedings of the ieee 2001 symposium on parallel and large-data visualization and graphics

作者： Ralph Bruckschen Falko Kuester Bernd Hamann Kenneth I. Joy University of California Davis CA University of California Irvine CA

ISBN: (纸本)9780780372238

visualization of particle traces provides intuitive and efficient means for the exploration and analysis of complex vector fields. This paper presents a method suitable for the real-time visualization of arbitrarily large time-varying vector fields in virtual environments. We describe an out-of-core scheme in which two distinct pre-processing and rendering components enable real-time data streaming and visualization. The presented approach yields low-latency application start-up times and small memory footprints. The described system was used to implement a "volumetric fog lance," which can emit up to 60000 particles into a flow field while maintaining an interactive frame rate of 60 frames per second. All algorithms were specifically designed to support commodity hardware. The proof-of-concept system is running on a low-cost Linux workstation equipped with a 120GB E-IDE RAID (Redundant Array of Inexpensive Disk) system.

关键词： Computational Fluid Dynamics Scientific visualization Out-of-Core visualization Particle Tracing Virtual Reality

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RHiNET-3/SW: an 80-Gbit/s high-speed network switch for distributed parallel computing

RHiNET-3/SW: an 80-Gbit/s high-speed network switch for dist...

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symposium on High Performance Interconnects

作者： Nishimura, S Kudoh, T Nishi, H Yamamoto, J Ueno, R Harasawa, K Fukuda, S Shikichi, Y Akutsu, S Tasho, K Amano, H Hitachi Ltd Cent Res Lab RWCP Opt Interconnect Hitachi Lab Hitachi Ibaraki Japan

ISBN: (纸本)0769513573

We have developed a prototype network switch, RHiNET-3/SW, for a RHiNET high-performance distributed parallel computing environment. It has eight I/O ports and each port provides high-speed, bi-directional 10-Gbit/s-per-port parallel optical data transmission in a distance of over 300 m. The aggregate throughput is 80 Gbit/s per board. A switch consists of a one-chip CMOS ASIC 8x8 switch LSI (SW-LSI;a 784-pin BGA package), four deskew LSIs, and eight pairs of 1.25-Gbit/s x 12-channel optical interconnection modules on a single board. The switch uses a hop-by-hop retransmission mechanism and credit-based flow control to provide reliable and long-transmission-distance data communication. The deskew LSI has a skew compensation function for 10-bit parallel data channels and an 8B10B encoder/decoder. Its optical transmitter modules use an 850-nm VCSEL and a 12-channel MMF (multi-mode fiber) ribbon. RHiNET-3/SW enables high-throughput, long-distance and flexible-flow-control network communication by means of distributed parallel computing using commercial PCs.

关键词： Bidirectional control Communication switching data communication High-speed networks large scale integration Optical interconnections Optical switches Optical transmitters parallel processing Prototypes

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parallel point reprojection 01

Parallel point reprojection

引用

proceedings of the ieee 2001 symposium on parallel and large-data visualization and graphics

作者： Erik Reinhard Peter Shirley Charles Hansen University of Utah

ISBN: (纸本)9780780372238

Improvements in hardware have recently made interactive ray tracing practical for some applications. However, when the scene complexity or rendering algorithm cost is high, the frame rate is too low in practice. Researchers have attempted to solve this problem by caching results from ray tracing and using these results in multiple frames via reprojection. However, the reprojection can become too slow when the number of samples that are reused is high, so previous systems have been limited to small images or a sparse set of computed pixels. To overcome this problem we introduce techniques to perform this reprojection in a scalable fashion on multiple processors.

关键词： ray tracing point reprojection

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