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检索条件"任意字段=7th International Symposium on Parallel and Distributed Computing"

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Efficient Resource-Aware Hybrid Configuration of distributed Pervasive Applications

Efficient Resource-Aware Hybrid Configuration of Distributed...

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7th international Conference on Pervasive computing

作者： Schuhmann, Stephan Herrmann, Klaus Rothermel, Kurt Univ Stuttgart Inst Parallel & Distributed Syst IPVS D-70569 Stuttgart Germany

ISBN: (纸本)9783642126536

As the size and complexity of Pervasive computing environments increases, configuration and adaptation of distributed applications gains importance. these tasks require automated system support, since users must not be distracted by the (re-)composition of applications. In homogeneous ad hoc scenarios, relying on decentralized configuration schemes is obviously mandatory, while centralized approaches may help to reduce latencies in weakly heterogeneous infrastructure-based environments. However, in case of strongly heterogeneous pervasive environments including several resource-rich and resource-weak devices, both approaches may lead to suboptimal results concerning configuration latencies: While the resource-weak devices represent bottlenecks for decentralized configuration, the centralized approach faces the problem of not utilizing parallelism. Instead, a hybrid approach that involves only the subset of resource-rich devices is capable of rendering configuration and adaptation processes more efficiently. In this paper, we present such a resource-aware hybrid scheme that effectively reduces the time required for configuration processes. this is accomplished by a balanced-load clustering scheme that exploits the computational power of resource-rich devices, while avoiding bottlenecks in (re-)configurations. We present real-world evaluations which confirm that our approach reduces configuration latencies in heterogeneous environments by more than 30% compared to totally centralized and totally decentralized approaches. this is an important step towards seamless application configuration.

关键词： Automation

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Multi-level topology-aware and multi-level parallelism on grid computing environments: A comparison of global arrays and OpenMP implementations

Multi-level topology-aware and multi-level parallelism on gr...

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7th Annual international Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology, ECTI-CON 2010

作者： Sirisup, Sirod U-Ruekolan, Suriya 112 Thailand Science Park Pahon Yothin Rd. Klong 1 Klong Luang Pathumthani 12120 Thailand

ISBN: (纸本)9789746724913

the Global Arrays toolkit is a library that allows programmers to write parallel programs that use large arrays distributed across processing nodes through the Aggregate Remote Memory Copy Interface (ARMCI). OpenMP is an application programming interface that supports shared memory multiprocessing on many architectures and platforms. In the Symmetric-Multi Processors (SMP), the Global Arrays toolkit will expose the programmers quite similar to that provided by OpenMP. In this study, we will further our investigation on the performance of a parallel application implemented with the Global Arrays toolkit and OpenMP on Grid computing environment. the investigation focuses on the case that an SMP cluster is included in the Grid computing environment. the multi-level parallelism together with multi-level topology-aware techniques have been used in both implementations. We have found that performance of the evaluating application implemented with Global Arrays technique is comparable to that of the application implemented with OpenMP. this implies that programmer can directly port the Global Arrays application directly to the SMP cluster yet its performance is not dropped compared to the native implementation.

关键词： Application programming interfaces (API)

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Chromatic dispersion compensation employing cascaded parallel optical all-pass filter

Chromatic dispersion compensation employing cascaded paralle...

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2010 7th international symposium on Communication Systems, Networks and Digital Signal Processing, CSNDSP 2010

作者： Ng, W.P. Loedhammacakra, W. Cryan, R.A. Ghassemlooy, Z. School of Computing Engineering and Information Sciences Northumbria University Newcastle upon Tyne NE1 8ST United Kingdom University of Huddersfield Queensgate Huddersfield HD1 3DH United Kingdom

ISBN: (纸本)9781861353696

this paper presents an alternative method to equalise chromatic dispersion (CD) within a high speed single mode fibre (SMF). the CD is due to the phase delay within the SMF. the CD contributes to the degradation of the quality of the optical pulse propagating in the SMF at high speed which results in pulse spreading. this phenomena will lead to inter-symbol interference (ISI), thus increasing the bit error rate (BER) of the system. In this paper a CD equalisation technique that utilises a cascaded parallel optical all pass filter (Cp-OAPF) is proposed. the Cp-OAPF acts as a phase equaliser which will invert the effect of SMF's phase delay. the Cp-OAPF is based on a class of digital all-pass filter. Simulation results at BER of 10-9 showed that the proposed equaliser can increase in the repeater-less length of a point-to-point optical communication system by 7 times with non-return to zero rectangular and Gaussian pulses at 10Gb/s. the signal-to-noise ratio improvement of 19.2 dB and 23.2 dB are achieved for rectangular and Gaussian pulses respectively for error free BER. © 2010 IEEE.

关键词： Chromatic dispersion

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An Extended cCSP with Stable Failures Semantics

An Extended cCSP with Stable Failures Semantics

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7th international Colloquium theoretical Aspects of computing

作者： Chen, Zhenbang Liu, Zhiming Natl Lab Parallel & Distributed Proc Changsha Hunan Peoples R China Natl United Univ Int Inst Software Technol Macao SAR Peoples R China

ISBN: (纸本)9783642148071

Compensating CSP (cCSP) is an extension to CSP for modeling long-running transactions It can be used to specify programs of service orchestration written in a programming language like WS-BPEL So far, only an operational semantics and a trace semantics are given to cCSP In this paper, we extend cCSP with more operators and define for it a stable failures semantics in order to reason about non-determinism and deadlock We give some important algebraic laws for the new operators these laws can be Justified and understood from the stable failures semantics A case study is given to demonstrate the extended cCSP

关键词： Semantics

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Rupeas: Ruby powered event analysis DSL

Rupeas: Ruby powered event analysis DSL

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international Conference on Networked Sensing Systems

作者： Woehrle, Matthias Plessl, Christian thiele, Lothar Computer Engineering and Networks Lab ETH Zurich Switzerland Paderborn Center for Parallel Computing University of Paderborn Germany

ISBN: (纸本)9781424479108

Wireless Sensor Networks (WSNs) are unique embedded computer systems for distributed sensing of a dispersed phenomenon. As WSNs are deployed in remote locations for longterm unattended operation, assurance of correct functioning of the system is of prime concern. thus, the design and development of WSNs requires specialized tools to allow for testing. To this end, we present a novel language, Rupeas, for analyzing WSNs based on collected events during system operation. Rupeas is independent from test specifics and thus generally applicable for analyzing event logs of WSN test executions. © 2010 IEEE.

关键词： Wireless sensor networks

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Management of missed transactions in a distributed system through Simulation

Management of missed transactions in a distributed system th...

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3rd IEEE international Conference on Computer Science and Information Technology (ICCSIT)

作者： Somananda, Yumnam Gaikwad, Ashok Singh, Y. Jayanta Mehrotra, S. C. IMSIT Fac Comp Applicat Aurangabad Maharashtra India 7th October Univ Fac Informat Technol Misurata Libya Dr BA Marathwada Univ Dept Informat Technol & Comp Sci Aurangabad Maharashtra India

ISBN: (纸本)9781424455379

A real time distributed computing system has heterogeneously connected computers to solve a single problem. If the transactions run across different sites, it may commit at one site and may get fail at other site, leading to an inconsistent transaction. the transaction in a real time database system has deadlines to process the workloads and it need to process transactions before these deadlines expired. Series of simulation study have been performed to manage the missed transactions under different transaction management conditions such as different workloads, distribution methods, execution mode-Distribution and parallel, impact of dynamic slack factors to throughput. the scheduling of data access are done in order to meet their deadlines and to minimize the number of transactions that missed deadlines. A new approach called as "intelligent agent" method is introduced. this agent will keep track and does recording of the status of failing transactions so that we can provide an extra slack time to improve the performance of the system.

关键词： intelligent agent execution mode throughput

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RCO: A Multi-channel MAC Protocol with Random Cooperation for Sensor Networks

RCO: A Multi-channel MAC Protocol with Random Cooperation fo...

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7th international Conference on Autonomic and Trusted computing

作者： Li, Jinbao Zhang, Desheng Heilongjiang Univ Sch Comp Sci & Technol Harbin 150080 Heilongjiang Peoples R China Key Lab Database Parallel Comp Harbin PT-150080 Peoples R China

ISBN: (纸本)9783642163548

To handle triple hidden terminal problems, this paper proposes RCO, an asynchronous multi-channel MAC protocol with random cooperation for sensor networks. By adopting a probability-based random cooperation, RCO effectively alleviates, if not eliminates, triple hidden terminal problems. More importantly, RCO is fully distributed with no requirements of time synchronization or multi-radio. therefore, it is very easy to implement RCO in resource-constrained wireless sensor nodes. the simulation and real testbed experimental results show that RCO achieves significant improvement in energy efficiency with increasing benefit when the number of channels and traffic loads increase, while maintaining higher throughput.

关键词： WSNs MAC protocols Multi-channel Random cooperation

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Enabling a Highly-Scalable Global Address Space Model for Petascale computing 10

Enabling a Highly-Scalable Global Address Space Model for Pe...

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7th ACM international Conference on computing Frontiers (CF)

作者： Tipparaju, Vinod Apra, Edoardo Yu, Weikuan Vetter, Jeffrey S. Oak Ridge Natl Lab Oak Ridge TN 37931 USA Auburn Univ Dept Comp Sci Auburn AL 36849 USA

ISBN: (纸本)9781450300445

Over the past decade, the trajectory to the petascale has been built on increased complexity and scale of the underlying parallel architectures. Meanwhile, software developers have struggled to provide tools that maintain the productivity of computational science teams using these new systems. In this regard, Global Address Space (GAS) programming models provide a straightforward and easy to use addressing model, which can lead to improved productivity. However, the scalability of GAS depends directly on the design and implementation of the runtime system on the target petascale distributed-memory architecture. In this paper, we describe the design, implementation, and optimization of the Aggregate Remote Memory Copy Interface (ARMCI) runtime library on the Cray XT5 2.3 PetaFLOPs computer at Oak Ridge National Laboratory. We optimized our implementation with the flow intimation technique that we have introduced in this paper. Our optimized ARMCI implementation improves scalability of both the Global Arrays (GA) programming model and a real-world chemistry application - NWChem - from small jobs up through 180,000 cores.

关键词： Global Address Space Global Arrays ARMCI XT5 NWChem Flow Control PGAS GAS GA

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A collaborative decision support model for marine safety and security operations 7th

A collaborative decision support model for marine safety and...

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7th IFIP TC 10 Working Conference on distributed and parallel Embedded Systems, DIPES 2010 and 3rd IFIP TC 10 international Conference on Biologically-Inspired Collaborative computing, BICC 2010 Held as Part of 21st IFIP World Computer Congress, WCC 2010

作者： Glässer, Uwe Jackson, Piper Araghi, Ali Khalili When, Hans Shahir, Hamed Yagho Ubi Software Technology Lab School of Computing Science Simon Fraser University BurnabyBC Canada MacDonald Dettwiler and Associates Ltd RichmondBC Canada

ISBN: (纸本)9783642152337

Collaboration and self-organization are hallmarks of many biological systems. We present the design for an intelligent decision support system that employs these characteristics: it works through a collaborative, self-organizing network of intelligent agents. Developed for the realm of Marine Safety and Security, the goal of the system is to assist in the management of a complex array of resources in both a routine and emergency role. Notably, this system must be able to handle a dynamic environment and the existence of uncertainty. the decentralized control structure of a collaborative self-organizing system reinforces its adaptiveness, robustness and scalability in critical situations. © IFIP international Federation for Information Processing 2010.

关键词： Decision support systems

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Media Access Control Protocol Based on Hybrid Antennas in Ad Hoc Networks

Media Access Control Protocol Based on Hybrid Antennas in Ad...

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Symposia and Workshops on Ubiquitous, Autonomic and Trusted computing, UIC-ATC

作者： Yanrong Ding Xiaodong Wang Hu Shen Pengyu Guo National Key Laboratory for Parallel and Distributed Processing Changsha China

Nested Circular Directional MAC, a modified medium access control protocol of DMAC protocol, is proposed in this paper to support both directional antennas and omni-directional antennas simultaneously in one Ad Hoc network. Omni-directional antennas follow the RTS/CTS mechanism which is multi-hop and directional antennas follow the DRTS/DCTS mechanism, ensuring the asymmetric communication effectively. In order to resolve new deafness problem and hidden terminal problem, the directional antennas also use circular DRTS and nested antenna circumrotation. Simulation results show that NCDMAC supports hybrid antennas effectively and is better than MMAC and Circular-MAC in terms of increasing throughput, but it also increases the communication delay.

关键词： Delay Deafness Directive antennas throughput Directional antennas Media Access Protocol

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