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IEEE international conference on Image Processing

作者： S.S. Skrzypkowiak V.K. Jain Department of Electrical Engineering University of South Florida Tampa FL USA

A neural network based motion-estimation technique is developed, that is applicable to sub-pixel as well as large movements. Experiments on typical test frame sequences indicate marked improvement in accuracy of motion vector estimates over the MPEG logarithmic block matching algorithm. The method utilizes a modified Hopfield neural network. Due to the neural network's fault-tolerant nature and parallel computation capability, fast, accurate, and reliable results are obtained. Application to MPEG based video compression is also discussed.< >

关键词： Neural networks Computer applications Computer networks Transform coding Testing Motion estimation Hopfield neural networks Fault tolerance Concurrent computing Video compression

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Model-based programming for parallel image processing

Model-based programming for parallel image processing

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IEEE international conference on Image Processing

作者： M.S. Moore G. Karsai J. Sztipanovits Department of Electrical Engineering Measurement and Computing Systems Laboratory Vanderbilt University Nashville TN USA

We describe a programming environment which is being developed for the automatic generation of parallel image processing applications. Through the use of model-based software synthesis, we transparently create large grained data parallel applications which can be executed on arbitrary processor networks. The high-level abstractions provided by the modeling paradigm isolates the user from the complexity of the underlying implementation, allowing developers with little or no experience in parallel programming to rapidly create parallel applications. The data parallel modeling facilities perform the same tasks as the data alignment and distribution compiler directives of High Performance Fortran and the aggregate objects of pC++. However, we have found that by introducing the parallelism on the system level, instead of in the algorithm, we can use traditional compilers and leave the application specific code unchanged. This allows us to take advantage of existing well developed image processing code libraries. Here we describe a system which generates data parallel versions of applications created in Khoros, the popular image processing package developed by the University of New Mexico. This system retains the best qualities of Khoros: its interactive and experimental nature, and its visual interface, but adds the capability for automatically generating much higher performance parallel implementations when needed. This system demonstrate the suitability of the model-based approach for developing parallel imaging software.< >

关键词： parallel programming Image processing Application software Programming environments Packaging Prototypes Software prototyping Algorithm design and analysis User interfaces Computer networks

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ARRAYS OF PROCESSING NODES FOR MASSIVELY parallel SORTING USING OPTICAL SWITCHING AND INTERCONNECT

ARRAYS OF PROCESSING NODES FOR MASSIVELY PARALLEL SORTING US...

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1st international conference on ASIC

作者： M.P.Y.Desmulliez F.A.P.Tooley J.G.Crowder N.L.Grant B.S.WherrettDepartmentofPhysics P.W.Foulk Department of Computing and Electrical Engineering Heriot-Watt University Riccarton Edinburgh EH14 4AS Scotland Department of Computing and Electrical Engineering Heriot-Watt University Riccarton Edinburgh EH14 4AS Scotland Department of Computing and Electrical Engineering Heriot-Watt University Riccarton Edinburgh EH14 4AS Scotland Department of Computing and Electrical Engineering Heriot-Watt University Riccarton Edinburgh EH14 4AS Scotland Department of Computing and Electrical Engineering Heriot-Watt University Riccarton Edinburgh EH14 4AS Scotland Department of Computing and Electrical Engineering Heriot-Watt University Riccarton Edinburgh EH14 4AS Scotland

This paper describes 2x2 sorting nodes for implementing the parallel bitonic sort with optical holographic switching. The nodes perform maximum-switch, minimum-switch, or straight-through transfers of two input streams. A 4x4 CMOS array has been fabricated using normal electrical interconnect between the GaAs optical transmitters and receivers and the CMOS array. A pipelined design for higher speed is also discussed.

关键词： ARRAYS OF PROCESSING NODES FOR MASSIVELY parallel SORTING USING OPTICAL SWITCHING AND INTERCONNECT

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APPLICATION OF MASSIVE parallel COMPUTER TO COMPUTATIONAL WIND engineering

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JOURNAL OF WIND engineering AND INDUstRIAL AERODYNAMICS 1993年第C期46-7卷 393-400页

作者： KATO, S MURAKAMI, S UTSUMI, Y MIZUTANI, K MIYAGI NATL COLL TECHNOL DEPT ARCHITECTURENATORIMIYAGI 98112JAPAN IIS CHUO KUTOKYO 103JAPAN

The airflow around a 2D square rib placed within a boundary layer is computed by means of a massive parallel computer. The Navier-stokes equations are solved by a finite difference method with the well-known simulation method of ABMAC. The present paper deals with the implementation and optimization of this numerical method in connection with the massive parallel computer system, which is a MIMD (Multi-Instructions and Multi-Data stream) computing system consisting of up to 1024 processors, each with 16 Mbytes of local memory. parallelization of the algorithm is achieved by regional partitioning, i.e. grid partitioning;a grid system of 242 x 242 cells is divided into subdomains, and data belonging to each subdomain is distributed to each processor. Computations are carried out for different numbers of processors and for different algorithms of data exchange between the processors;the speedup ratio (i.e. increasing ratio of computing speed) and the efficiency of parallelization were measured. The results show that the communication method between individual processors and the size of the divided subdomains are rather crucial in their effects on granularity (i.e. the ratio of calculating time to communicating time for each processor).

关键词： Aerodynamics

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parallel multigrid methods: Implementation on SUPRENUM-like architectures and applications 1st

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1st international conference on Supercomputing, 1987

作者： Solchenbach, Karl Thole, Clemens-August Trottenberg, Ulrich Suprenum GmbH Hohe Str. 73 BonnD-5300 Germany Gesellschaft für Mathematik und Datenverarbeitung St. AugustinD-5205 Germany

ISBN: (纸本)9783540189916

Multigrid (MG) methods for partial differential equations (and for other important mathematical models in scientific computing) have turned out to be optimal on sequential computers. Clearly, one wants to apply them also on vector and parallel computers in order to exploit both, the high MG-efficiency (compared to classical methods) and the full computational power of modern supercomputers. For this purpose, parallel MG methods are needed. It turns out that certain well-known standard MG methods (with RB and zebra-type relaxation, as described in [25]) already contain a sufficiently high degree of parallelism. Among innovative supercomputer architectures, MIMD multiprocessor computers with local memory and a vector unit in each processor are particularly promising. A software approach that corresponds to such architectures in a natural way is the abstract SUPRENUM concept. It is characterized by a dynamical process system, where each process has its own data space and communicates with other processes by message-passing. In this paper, we show how such architectures and software concepts are used for the solution of large scale grid problems (discrete PDEs, etc.). grid partitioning and blockstructuring — with communication only along the subgrid or block boundaries — are the natural approches in this context. Any grid oriented method, in particularly any MG method can be efficiently parallelized using these approaches. In the SUPRENUM project, powerful software tools (e.g. a mapping library for the process-processor mapping and a communication library for the intergrid data exchanges) are developed that make it very easy to implement single grid and MG methods on local memory multiprocessor systems. parallel MG programs have been run on the SUPRENUM simulator [16], the SUPRENUM pre-prototype [22] and some other local memory machines like the Intel iPSC and the CalTech hypercube. © 1988, Springer-Verlag.

关键词： Supercomputers

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Filter-based join algorithms on uniprocessor and distributed-memory multiprocessor database machines 1st

Filter-based join algorithms on uniprocessor and distributed...

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1st international conference on Extending Database Technology, EDBT 1988

作者： Qadah, Ghassan Z. Electrical Engineering and Computer Science Department Northwestern University EvanstonIL60201 United States

ISBN: (纸本)9783540190745

The hybrid-hash algorithm and its parallel variant have been recently found to outperform all other algorithms in joining disk-based large relations on uniprocessor and ring-interconnected distributed-memory multiprocessor database machines. This paper presents several extensions to the centralized and distributed hybrid-hash algorithms. These extensions are based on the usage of one or more bit-vectors as filters. A comparative performance study to the presented algorithms is carried out. In a uniprocessor environment, this study shows that one of the proposed filter-based algorithms outperforms all of the other ones, including the hybrid-hash algorithm. In a distributed environment, the filter-based algorithms are found to suffer from a serious problem, namely, overloading the interconnection network with the transmission of large size bit-vectors. Different compression schemes are proposed to reduce the size of a transmitted bit-vector. The augmentation of the distributed version of best-performing centralized algorithm with one of the proposed compression schemes have been found to outperform all of the other algorithms and substantially improves the performance of the join operation. © 1988, Springer-Verlag.

关键词： Bandpass filters

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Multiprocessor systems programming in a high-level data-flow language 1st

Multiprocessor systems programming in a high-level data-flow...

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1st international conference on parallel Architectures and Languages Europe, PARLE 1987

作者： Gaudiot, J.L. Lee, L.T. Computer Research Institute Department of Electrical Engineering — Systems University of Southern California Los AngelesCA United States

ISBN: (纸本)9783540179436

The data-flow model of computation is an attractive methodology for multiprocessor programming for it offers the potential for unlimited parallelism detection at no programmer's expense. It is here applied to a distributed architecture based on a commercially available microprocessor (the Inmos Transputer). In this project, we have integrated the high-level data driven principles of scheduling within the Transputer architecture so as to provide high programmability of our multicomputer system. A complete programming environment which translates a complex data-flow program graph into occam has been developed and is presented in this paper. We here describe in detail the mapping from the SISAL high-level constructs into the low-level mechanisms of the Transputer (synchronization, structure representation, etc.). The partitioning issues (granularity of the graph) are presented and several solutions based upon both data-flow analysis (communication costs) and program syntax (program structure) are proposed and have been implemented in our programming environment. Finally, we present and analyze graph allocation and optimization schemes to improve the performance of the resulting occam program. © 1987, Springer-Verlag.

关键词： Transputers

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MULTI-grid ORIENTED COMPUTER ARCHITECTURE.

MULTI-GRID ORIENTED COMPUTER ARCHITECTURE.

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Proceedings of the 1985 international conference on parallel Processing.

作者： Bode, A. Fritsch, G. Haendler, W. Henning, W. Hofmann, F. Volkert, J. Univ of Erlangen-Nuernberg Erlangen West Ger Univ of Erlangen-Nuernberg Erlangen West Ger

ISBN: (纸本)0818606371

Numerical simulation of physical phenomena using realistic 3D models requires powerful computers. Because of discretization, such problems have grid structure and the numerical processes are mainly local. As these numerical problems are suitable for parallel computing, multiprocessor systems can be used. An architectural concept is described which allows for appropriate mapping of the problem structure, in particular multigrid problems, onto a multiprocessor structure. The basis of results from experimental multiprocessor systems, theoretical studies, and simulation experiments a high-performance multiprocessor system is proposed. The overall performance of the system will be 1 GFLOPS, 1-GB main memory, 38-GB mass storage, and 640-Mb/s data transfer from mass storage. A possible structure is given for the fast arithmetic coprocessor of the processor-memory-modules.

关键词： COMPUTER ARCHITECTURE

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PROCEEDINGS OF THE international conference ON computing IN CIVIL engineering, 1st, 1981.

PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON COMPUTING IN ...

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Proc of the Int Conf on Comput in Civ Eng, 1st

作者： Anon

The volume contains 95 papers presented at the meeting, 72 of which are indexed separately. The papers are grouped under general topics that include modeling for finite element analysis, networks and distributed processing, structural engineering applications, remote sensing, real-time applications, software quality assurance, mapping, railroad engineering applications, geotechnical applications, computer aided design methods, civil engineering software exchange, interactive graphics, hydrology and hydraulics applications, transportation systems applications, and others.

关键词： Civil engineering

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PROCEEDINGS OF THE international conference ON computing IN CIVIL engineering, 1st, 1981.

CRREL Report (US Army Cold Regions Research and Engineering ...

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CRREL Report (US Army Cold Regions Research and engineering Laboratory) 1981年

作者： Anon

关键词： CIVIL engineering

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