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SCALABLE parallel IMPLEMENTATIONS OF PERCEPTUAL GROUPING ON CONNECTION MACHINE CM-5 12

SCALABLE PARALLEL IMPLEMENTATIONS OF PERCEPTUAL GROUPING ON ...

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conference C on Signal processing and conference D on parallel Computing, at the 12th IAPR international conference on Pattern Recognition

作者： PRASANNA, VK WANG, CL UNIV SO CALIF DEPT EE SYSTLOS ANGELESCA 90089

ISBN: (纸本)0818662751

Perceptual grouping is a key step in vision to organize image data into structural hypotheses to be used for high level analysis. In this paper, we propose data allocation and load balancing strategies which reduce the communication cost and evenly distribute the grouping operations among the processors. these techniques result in scalable algorithms for performing perceptual grouping on CM-5. the performance of our algorithms depends only on the total grouping operations generated by the image data and is independent of the distribution of the data among the processors. Our implementations show that given a 1K × 1K input image, extraction of line segments and several perceptual grouping steps can be performed in 5.0 seconds using a partition of CM-5 having 32 processing nodes. A serial implementation of these steps on a Sun Sparc 400 takes more than 2 minutes. © 1994 IEEE.

关键词： parallel processing systems

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Role of high performance parallel computing in biological research

Role of high performance parallel computing in biological re...

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Proceedings of the 16th Annual international conference of the IEEE Engineering in Medicine and Biology Society. Part 1 (of 2)

作者： Martino, Robert L. Johnson, Calvin A. Suh, Edward B. Trus, Benes L. Yap, Tieng K. Natl Inst of Health Bethesda United States

Scalable parallel computer architectures provide the computational performance demanded by advanced biological computing problems. NIH has developed a number of parallel algorithms and techniques useful in determining biological structure and function. these applications include processing electron micrographs to determine the three-dimensional structure of viruses, calculating the solvent accessible surface area of proteins to predict the three-dimensional conformation of these molecules from their primary structure, and searching for homologous DNA sequences in large genetic databases. Timing results demonstrate substantial performance improvements with parallel implementations compared with conventional sequential systems.

关键词： parallel processing systems

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processing array statements and procedure interfaces in the prepare high PERFORMANCE fortran compiler 5th

Processing array statements and procedure interfaces in the ...

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5th international conference on Compiler Construction, CC 1994

作者： Benkner, Siegfried Brezany, Peter Zima, Hans Institute for Software Technology and Parallel Systems University of Vienna Brünnerstrasse 72 ViennaA-1210 Austria

ISBN: (纸本)9783662466629

Recently, a standard set of extensions for Fortran 90, called High Performance Fortran (HPF), has been developed which would provide a portable interface to a wide variety of parallel architectures. HPF focuses mainly on issues of distributing data across the memories of a distributed memory multiprocessor. this paper proposes techniques for processing HPF data distribution and data alignment specifications, array statements and procedure interfaces in the HPF compiler which is being developed in the ESPRIT project Prepare. © Springer-Verlag Berlin Heidelberg 1994.

关键词： Data handling

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DYNAMIC PERCEPTRON - SOME thEOREMS ABOUT thE POSSIBILITY OF parallel PATTERN-RECOGNITION WIth AN APPLICATION TO HIGH-ENERGY PHYSICS 5

DYNAMIC PERCEPTRON - SOME THEOREMS ABOUT THE POSSIBILITY OF ...

引用

5th international conference on Applications of Artificial Neural Networks

作者： PERRONE, AL CASTIGOLIONE, P BASTI, G MESSI, R UNIV ROMA TOR VERGATA DEPT PHYSI-00133 ROMEITALY

ISBN: (纸本)0819415472

In the context of M. Minsky's and S. Papert's theorems on the impossibility of evaluating simple linear predicates by parallel architectures we want to show how these limitations can be avoided by introducing a generalized input-dependent preprocessing technique that does not suppose any a-priori knowledge of input like in classical input filtering procedures. this technique can be formalized in a very general way and can be also deduced by meta- mathematical arguments. A further development of the same technique can be applied at level of learning procedure to introduce in such a way the complete notion of `dynamic perception'. From the experimental standpoint, we show two applications of the dynamic perceptron in particle track recognition in high-energy accelerators. Firstly, we show the amazing improvement of performances that can be obtained in a perceptron architecture with classical learning by adding our dynamic preprocessing technique, already introduced last year in another paper presented at this conference. Secondly, we show the first results of this technique extended also at the level of learning procedure always applied to the problem of particle track recognition.

关键词： Particles Physics Retina Chemical elements Muons Computer architecture Electromagnetism Pattern recognition algorithms Americium

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parallel algorithm and architecture for robot path planning

Parallel algorithm and architecture for robot path planning

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Proceedings of the 8th international parallel processing Symposium

作者： Ranganathan, N. Parthasaraathy, Bharadwaj Hughes, Ken Univ of South Florida Tampa United States

ISBN: (纸本)0818656026

Path planning is an essential step in any mobile robot system. In this paper, we propose a parallel algorithm and architecture for this computationally intensive problem. the parallel implementation is based on the trulla algorithm proposed earlier by the authors in [5]. the algorithms uses a wavefront like propagation technique and computes the near-optimal paths from every point in the grid space to the specified destination. the algorithm is implemented on a linear systolic array architecture which is simple and regular in structure and can be implemented as a VLSI system. Currently, a prototype VLSI chip with 5 processor cells in being implemented at the University of South Florida.

关键词： parallel processing systems

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Proceedings of the 27th Hawaii international conference on System Sciences (HICSS-27). Part 2 (of 5)

Proceedings of the 27th Hawaii International Conference on S...

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the 27th Hawaii international conference on System Sciences, HICSS-27

the proceedings contains 65 papers on systems science. Topics discussed include databases, computer systems, computer programming, algorithms, computer programming languages, computer operating systems, program compil... 详细信息

ISBN: (纸本)0818650605

关键词： Systems science

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NEURAL-NETWORK IMPLEMENTATION OF MAthEMATICAL MORPHOLOGY OPERATION 5

NEURAL-NETWORK IMPLEMENTATION OF MATHEMATICAL MORPHOLOGY OPE...

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5th international conference on Applications of Artificial Neural Networks

作者： TAO, P SHANGHAI JIAO TONG UNIV INST IMAGE PROCSHANGHAI 200030PEOPLES R CHINA

ISBN: (纸本)0819415472

this paper proposes a feedforward neural network structure to realize the mathematical morphology operations (MMO), namely: HMT (Hit and Miss Transformation), dilation, erosion, opening, closing, and the union and intersection (for multistructuring elements and multioperators) of them. Different kinds of operations can be implemented by assigning the weights, the threshold values and the architecture of the network according to the operation itself to be implemented. A general expression relating the weight value, threshold value to the configuration of the structuring element for different operations is derived, the assigning of the values becomes merely straight-forward training procedure of the proposed network. Also, it is proved that with a single hidden layer, all the MMO can be implemented by the ANN. the most interesting aspect of the method proposed is the reduction of on-line operation steps, which for conventional MMO algorithm consist of a series of operations processed consecutively. As a extension of the method, Boolean function implementations of the operations are also proposed, in which, the concept of collection of basic `And' structuring elements is presented. We prove that all MMO sequence can be implemented by a 2-layer logic gate array (or 3 layers in the sense of node levels).

关键词： Berkelium Logic devices Mathematical morphology Neural networks Binary data Network architectures Signal processing Transform theory Logic parallel processing

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ROLE OF COHERENCE IN OPTICAL-PATTERN RECOGNITION 5

ROLE OF COHERENCE IN OPTICAL-PATTERN RECOGNITION

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5th conference on Optical Pattern Recognition

作者： VANDERGRACHT, J MAIT, JN PRAthER, DW AthALE, RA USA RES LABADELPHIMD 20783

ISBN: (纸本)0819415413

Spatial coherence in optical processing can be exploited to implement a wide variety of image processing functions. While fully coherent systems tend to receive the most attention, spatially noncoherent systems can often provide equivalent functionality while offering significant advantages over coherent systems with regard to noise performance and system robustness. the term noncoherent includes both partially coherent and fully incoherent illumination. In addition to the noise immunity advantage, noncoherent diffraction-based processors have relaxed requirements on pupil plane spatial light modulator characteristics. In this paper we provide a discussion of the tradeoffs between coherent and noncoherent processing, taking into account the limited performance characteristics of commercially available spatial light modulators. the advantages of noncoherent processing are illustrated with numerical and experimental results corresponding to three different noncoherent architectures.

关键词： Point spread functions Spatial light modulators Optical correlators Optical pattern recognition Signal to noise ratio Optical signal processing Phase only filters Phase shift keying Image processing Modulation

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A dynamic algorithm for online scheduling of parallel processes 6th

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6th international conference on parallel architectures and Languages Europe, PARLE 1994

作者： Papadopoulos, Constantinos V. Department of Computer Science University of Piraeus Greece

ISBN: (纸本)9783540581840

We study the following general online scheduling problem. parallel jobs arrive dynamically according to the dependencies between them. Each job requests a certain number of processors with a specific communication configuration, but its running time is not known until it is completed. We present optimal online algorithms for PRAMs, hypercubes and one-dimensional meshes, and obtain optimal tradeoffs between the competitive ratio and the largest number of processors requested by any job. Our work shows that for efficient online scheduling it is necessary to use virtualization, i.e., to schedule parallel jobs on fewer processors than requested while preserving the work. We prove that tree constraints are complete for the scheduling problem. i.e., any algorithm that solves the scheduling problem if the dependency graph is a tree can be converted to solve the general problem equally efficiently. this shows that the structure of a dependency graph is not as important for online scheduling as it is for offline scheduling, although even simple dependencies make the problem much harder than scheduling independent jobs. © Springer-Verlag Berlin Heidelberg 1994.

关键词： parallel processing systems

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Performance tuning with AIMS - an automated instrumentation and monitoring system for multicomputers

Performance tuning with AIMS - an automated instrumentation ...

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the 27th Hawaii international conference on System Sciences, HICSS-27

作者： Yan, Jerry C. NASA Ames Research Cent Moffett Field CA United States

ISBN: (纸本)0818650605

Whether a researcher is designing the `next parallel programming paradigm,' another `scalable multiprocessor' or investigating resource allocation algorithms for multiprocessors, a facility that enables parallel program execution to be captured and displayed is invaluable. A software toolkit that facilitates performance evaluation of parallel applications on multiprocessors, the Automated Instrumentation and Monitoring System (AIMS), is described in this paper. It has four major software components: a source-code instrumentor, which automatically inserts event recorders into the application;a run-time performance-monitoring library, which collects performance data;a tracefile animation and analysis toolkit;and a trace post-processor which compensates for data collection overhead. We illustrate the process of performance tuning using AIMS with two examples. Currently, AIMS accepts FORTRAN and C parallel programs written for TMC's CM-5, Intel's iPSC/860, iPSC/Delta, Paragon, and HP workstations running PVM.

关键词： parallel processing systems

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