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parallel bidirectional heuristic search with dynamic process re-direction

Parallel bidirectional heuristic search with dynamic process...

引用

International symposium on parallel processing

作者： A.A. Toptsis Department of Computer Science and Mathematics Atkinson College York University Toronto ONT Canada

Non-wave shaping parallel bidirectional heuristic search algorithms have been reported to suffer of the bidirectional search anomaly. Although wave-shaping is considered as the most natural approach, parallel bidirectional wave-shaping algorithms are extremely scarce. We introduce a wave-shaping algorithm for parallel bidirectional heuristic search in distributed memory environments. the method is inspired by the celebrated uniprocessor bidirectional wave-shaping algorithm of DeChampeaux-Sint (1977). Our performance evaluation shows that the proposed method scales well, maintains good performance for increasing problem sizes, and attains close to linear speedup over the sequential DeChampeaux-Sint algorithm.< >

关键词： Artificial intelligence Joining processes Heuristic algorithms Costs Computer science Mathematics Educational institutions parallel processing

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Power supply system of DC/AC micro grid system

Power supply system of DC/AC micro grid system

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8th International Conference on Power Electronics - ECCE Asia: "Green World with Power Electronics", ICPE 2011-ECCE Asia

作者： Yukita, K. Ban, K. Goto, Y. Ichiyanagi, K. Hirose, K. Ushirokawa, T. Okui, Y. Takabayashi, H. Aichi Institute of Technology 1247 Yachigusa Yagusa Toyota 470-0392 Japan NTT Facilites Inc G.H.Y. Bldg. 2-13-1 Kitaotsuka Toshima-ku Tokyo 170-0004 Japan SANYO Denki Co. Ltd 812-3 Shimonogo Ueda Nagano 386-1211 Japan Shin-Kobe Electric Machinery Co. Ltd 1300-5 Hachiman Nabari Mie 518-0493 Japan

ISBN: (纸本)9781612849560

this paper proposes an AC/DC power supply system with DGs using the parallel processing method. the purpose of this system is to supply the power without connecting to the utility gird. the DGs consist of photovoltaic (PV), -and wind generators (WG), and the main energy source of this system is the DGs and the UPS battery. When the system does not get enough energy from the DGs, and the power supply of the battery runs out, this system connects to the utility grid and begins to charge the battery and supply to the load. In this study, we focused on the AC power supply and DC power supply from DGs. then, the converters of DGs use two types, DC/AC type and DC/DC type. the power supply system has been operated with the actual loads of 20 kW in the campus of the Aichi Institute of Technology. this paper reports on our study of DC and AC power supplies in the event of a system anomaly. © 2011 ieee.

关键词： distributed power generation

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Processor mapping techniques toward efficient data redistribution

Processor mapping techniques toward efficient data redistrib...

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International symposium on parallel processing

作者： E.T. Kalns L.M. Ni Department of Computer Science Michigan State University East Lansing MI USA

Run-time data redistribution can affect algorithm performance in distributed-memory machines. Redistribution of data can be performed between algorithm phases when a different data decomposition is expected to deliver increased performance for a subsequent phase of computation. Additionally, data redistribution can occur at subprogram boundaries. Redistribution, however, represents increased program overhead as algorithm computation is necessarily discontinued while data are exchanged among processor memories. In this paper, we present a technique for data-processor mapping, applicable to data redistribution, that minimizes the total amount of data that must be communicated among processors. the mapping technique is architecture-independent and represents our initial work toward achieving efficient redistribution in distributed-memory machines.< >

关键词： Runtime distributed computing Computer science System performance US Department of Energy High level languages Memory Costs

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Fuzzy communication for guided loop scheduling in multicomputers

Fuzzy communication for guided loop scheduling in multicompu...

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International symposium on parallel processing

作者： Chien-Ming Cheng Kai Hwang Advanced Computing Systems Company Los Angeles CA USA Department of EE-Systems University of Southern California Los Angeles CA USA

ISBN: (纸本)0818656026

We propose the use of guided loop scheduling and fuzzy communications to map shared-variable communications into message passing operations among multicomputers. the mapping mechanism converts scalar message passing operations into multiple broadcast or multiple multicast operations. the proposed method is evaluated by both simulation experiments and theoretical analysis. the performance results, considering both communication and computation, are reported for mapping two distributed matrix algorithms. Simulated benchmark results demonstrate improved performance and minimized execution time. the proposed method offers the potential to take advantage of the programmability of shared-memory systems and the scalability of distributed-memory systems.< >

关键词： Message passing Processor scheduling Broadcasting Scheduling algorithm Matrix converters Multicast algorithms Scalability parallel processing Complexity theory Partitioning algorithms

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PermaDAQ: A Scientific Instrument for Precision Sensing and Data Recovery in Environmental Extremes

PermaDAQ: A Scientific Instrument for Precision Sensing and ...

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8th International symposium on Information processing Sensor Networks

作者： Beutel, Jan Gruber, Stephan Hasler, Andreas Lim, Roman Meier, Andreas Plessl, Christian Talzi, Igor thiele, Lothar Tschudin, Christian Woehrle, Matthias Yuecel, Mustafa ETH Comp Engn & Networks Lab Zurich Switzerland Univ Zurich Phys Geography Div Dept Geophys Zurich Switzerland Univ Paderborn Paderborn Ctr Parallel Comp Paderborn Germany Univ Basel Dept Comp Sci Basel Switzerland

ISBN: (纸本)9781424451081

the PermaSense project has set the ambitious goal of gathering real-time environmental data for high-mountain permafrost in unattended operation over multiple years. this paper discusses the specialized sensing and data recovery architecture tailored to meet the precision, reliability and durability requirements of scientists utilizing the data for model validation. We present a custom sensor interface board including specialized sensors and redundancy features for end-to-end data validation. Aspects of high-quality data acquisition, design for reliability by strict separation of operating phases and analysis of energy efficiency are discussed. the system integration using the Dozer protocol scheme achieves a best-in-class average power consumption of 148 mu A considerably exceeding the lifetime requirement.

关键词： Architecture Data Acquisition Environmental Monitoring Wireless Sensor Networks Low-Power

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Barrier synchronization techniques for distributed process creation

Barrier synchronization techniques for distributed process c...

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International symposium on parallel processing

作者： R. DeMara B. Mortlagh C. Lin S. Kuo Department of Electrical and Computer Engr. University of Central Florida Orlando FL USA University of Central Florida Orlando FL US Dept. of Electr. & Comput. Eng. Univ. of Central Florida Orlando FL USA Department of Electrical Engineering-Systems University of Southern California Los Angeles CA USA

Synchronization techniques are proposed for algorithms which spawn processes remotely on loosely coupled processors based on run-time characteristics. the performance of the proposed synchronization schemes are measured on the iPSC/2 and SNAP-1 multiprocessors and their implementation cost is discussed. Results show that processes created dynamically throughout a distributed system can be synchronized at comparable overhead and cost to that required for fixed-location process creation.< >

关键词： Runtime Costs distributed computing Hypercubes Degradation Bandwidth

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Fault location in multistage interconnection networks with global and distributed control

Fault location in multistage interconnection networks with g...

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International symposium on parallel processing

作者： E.G. Bernard M. Sauer J.A. Nossek Institute for Network Theory and Circuit Design TU Munich Munich Germany

A procedure is presented for locating single faults in N/spl times/N cube-type interconnection networks with global and with distributed control. Networks with distributed control are assumed to be based on comparator cells with bit-serial architecture. It is shown that fault location requires eight tests for interconnection networks with global control under a functional fault model and four sets of test vectors for interconnection networks with distributed control under the stuck-at fault model, given a specific implementation of the comparator cell. the outstanding feature of this procedure is that the input vectors are independent not only of the network size, but also of the actual fault location. thus, the fault location procedure can easily be implemented and has low time consumption.< >

关键词： Fault location Intelligent networks Multiprocessor interconnection networks distributed control Testing Circuit faults Fault tolerance Circuit synthesis Very large scale integration Network topology

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parallelization of linearized applications in Fortran D

Parallelization of linearized applications in Fortran D

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International symposium on parallel processing

作者： L.M. Liebrock K. Kennedy Rice University USA

Fortran D extends Fortran to parallel computers via specification of the distribution of array variables across processors. When multidimensional arrays have been linearized for optimal performance on vector processors, Fortran D cannot produce the best parallelization because it is limited to one-dimensional distribution, which is less efficient due to surface-to-volume effects. We propose Fortran D extensions and compiler technology to support natural topology parallelization of such codes. Experimental results are presented to illustrate the improvement in performance of this approach over the performance of currently available methods.< >

关键词： Vector processors Topology Multidimensional systems Application software Concurrent computing distributed computing Cost function Logic arrays NASA Array signal processing

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A Discrete Data Dividing Approach for Erasure-Code-Based Storage Applications

A Discrete Data Dividing Approach for Erasure-Code-Based Sto...

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2014 ieee 8th International symposium on Service Oriented System Engineering

作者： Weidong Sun Yijie Wang Yongquan Fu Xiaoqiang Pei Science and Technology on Parallel and Distributed Processing Laboratory National University of Defense Technology Changsha Hunan P. R. China

Erasure codes are promising for improving the reliability of the storage system due to its space efficiency compared to the replication methods. Traditional erasure codes split data into equalsized data blocks and encode strips in different data blocks. this brings heavy repairing traffic when clients read parts of the data, since most strips read for repairing are not in the expected blocks. this paper proposes a novel discrete data dividing method to completely avoid this problem. the key idea is to encode strips from the same data block. We could see that for repairing failed blocks, the strips to be read are either in the same data block with corrupted strips or from the encoded strips. therefore, no data is wasted. We design and implement this data layout into a HDFS-like storage system. Experiments over a small-scale testbed shows that the proposed discrete data divided method avoids downloading data blocks that are not needed for clients during the repairing operations.

关键词： Strips Decoding Encoding distributed databases Writing Reliability Magnetic heads

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Query-based horizontal fragmentation approach for disjunctive deductive databases

Query-based horizontal fragmentation approach for disjunctiv...

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Proceedings of the 1997 8th International Workshop on Database and Expert Systems Applications, DEXA'97

作者： Ng, Yiu-Kai Seetheraman, Aparna Brigham Young Univ Provo United States

A disjunctive deductive database (DDDB) is more general than the deductive database model since the former captures more information than the latter. Distributing a DDDB facilitates the splitting of queries of the database into subqueries to enhance query processing since the answers to each subquery are computed only against those portions of the DDDB relevant to the subquery and can be generated in parallel. Evaluating these subqueries thus improves the response time of the system and reduces communication cost involved in evaluating the entire query. Existing literature on DDDBs does not include a well-designed horizontal fragmentation approach. In this paper, we propose a horizontal fragmentation approach for any given DDDB D based on the set of common user queries S of D from which a fragment is produced for each query Q in S. All the rules and ground facts in D required to answer Q are collected into a fragment F, and it is sufficient to evaluate Q against F alone to compute all answers to Q. Hence, the need to process fragments generated by the other queries of D is eliminated, and time and cost of unnecessary processing is saved.

关键词： distributed database systems

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