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A strategy for distributing procedures on distributed memory multiprocessors

A strategy for distributing procedures on distributed memory...

引用

international conference on Industrial Electronics, Control and Instrumentation

作者： M. Nomura H. Murakoshi N. Funakubo Department of Electronic Systems Engineering Tokyo Metropolitan Institute of Technology Hino Tokyo Japan

this paper proposes a strategy for distributing program fragments by focusing on each variable of which status is modified by actors. the parallel computing environment where users do not need to pay attention to messages is provided. In this strategy distributed memory multiprocessors can execute programs written by procedural languages without any extension. Also, this approach is useful to reduce the amount of data passing through the network. We simulated this strategy for simple problems and found that messages passed among processors efficiently.< >

关键词： Computer languages parallel processing Message passing Program processors systems engineering and theory Computational modeling distributed control Control systems throughput

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Comparing and Refining Gossip Protocols for Fault Tolerance in Wireless P2P systems

Comparing and Refining Gossip Protocols for Fault Tolerance ...

引用

Euromicro conference on parallel, distributed and Network-Based Processing

作者： Jin Yang Tobias Simon Christopher Mueller Daniel Klan Kai-Uwe Sattler Department of Computer Science & Automation Ilmenau University of Technology Germany

As a special type of wireless P2P systems, sensor networks are often deployed for detecting events caused by disasters. the peer-to-peer mode of the sensor system itself gets challenged either directly by damages of the disaster or by unreliable wireless links. this work explores possible failure models and compares the performance of several gossip protocols corresponding to the failures models. With further refinement of the gossip protocols, the performance in the failure modes caused by disasters is improved. the evaluation of our simulation results shows that using refined gossip protocols in correspondence to the failure models, the information aggregation and dissemination speed, communication cost and the accuracy of the aggregated data can be improved.

关键词： Protocols Peer to peer computing Base stations Accuracy History Wireless communication Wireless sensor networks

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Striping and buffer caching for software RAID file systems in workstation clusters

Striping and buffer caching for software RAID file systems i...

引用

international conference on distributed computing systems

作者： Jong-Hoon Kim Se-Woong Eom S.H. Noh Yoo-Hun Won Department of Computer Education Cheju National University of Education Cheju Island South Korea Department of Computer Engineering Hongik University Seoul South Korea

A software RAID file system is defined as a system that distributes data redundantly across an array of disks attached to each of the workstations connected to a high-speed network. this configuration provides higher throughput and availability compared to conventional file systems. In this paper, we consider two specific issues, namely the distribution of data among the cluster (i.e. striping) and buffer caching for such an environment. through simulation studies, we compare the performance of various striping methods and show that, for effective striping in software RAID file systems, we must take advantage of its flexible nature. Furthermore, for buffer caching, we show that conventional caching schemes that have been developed for distributed systems are insufficient, and that the ExODP (Exclusively Old Data and Parity) scheme, which is presented in this paper, overcomes the limitations of the previously proposed schemes.

关键词： Software systems File systems Workstations Computer science education throughput parallel processing World Wide Web Concurrent computing Costs File servers

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PETransWS: Web Service computing Platform for Logistics and Transportation

PETransWS: Web Service Computing Platform for Logistics and ...

引用

Euromicro conference on parallel, distributed and Network-Based Processing

作者： Francisco Almeida Vicente Blanco Julio Brito Andres Crespo Jose A. Moreno Adrian Santos PETrans Proyecto Estructurante de Transporte Department de Estadística I.O. y Computación University of La Laguna La Laguna Spain

In large organizations and small firms in transportation, there is a growing need to use and analyze spatial data. Transportation system analysis and planning as well as mobility studies frequently use Geographic Information systems (GIS). In this paper we propose the development of a web services platform dedicated to transportation and logistics. Taking advantage of the web services development framework PyOpenCF we integrate in the same environment services oriented to geolocalization, logistical optimization, etc. We develop a PyOpenCF client whose graphic interface allows processes with spatial data to be launched and provides a visualization of the results.

关键词： Geographic Information systems Transportation Servers Web services Standards Data models Spatial databases

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Scalable Secure Routing for Heterogeneous Unstructured P2P Networks

Scalable Secure Routing for Heterogeneous Unstructured P2P N...

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Euromicro conference on parallel, distributed and Network-Based Processing

作者： Stefan Kraxberger Institute of Applied Information Processing and Communications Graz University of Technology Graz Austria

In this paper, we propose a secure routing algorithm based on three simple levels and show its applicability to heterogeneous unstructured overlays. Due to the lack of secure routing protocols for unstructured overlays we have started to investigate a possible solution for these systems. We propose a scalable secure routing protocol for heterogenous environments. through analytical study and experimental results we demonstrate the secure routing protocols potential in providing a secure topology management service for a broad range of node classes and communication capabilities. We show that it is possible to combine security, scalability and adaptability in one mechanism allowing each node to achieve an adequate level of security to meet the overall system requirements.

关键词： Peer to peer computing Routing protocols Routing Data security Authentication

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Solving the Multi-Operator Placement Problem in Large-Scale Operator Networks

Solving the Multi-Operator Placement Problem in Large-Scale ...

引用

international conference on Computer Communications and Networks (ICCCN)

作者： Stamatia Rizou Frank Dürr Kurt Rothermel Universität Stuttgart Institute of Parallel and Distributed Systems Stuttgart Germany

Processing streams of data in an overlay network of operators distributed over a wide-area network is a common idea shared by different applications such as distributed event correlation systems and large-scale sensor networks. In order to utilize network resources efficiently and allow for the parallel deployment of a large number of large-scale operator networks, suitable placement algorithms are vital that place operators on physical nodes. In this paper, we present a distributed placement algorithm that minimizes the bandwidth-delay product of data streams between operators of the network in order to reduce the induced network load. Since the fundamental optimization problem is NP-hard, we propose a heuristic solution. First, we calculate an optimal solution in an intermediate continuous search space, called latency space. Subsequently the continuous solution is mapped to the physical network. Our evaluations show that this algorithm reduces the resulting network load significantly compared to state of the art algorithms and achieves results close to the optimum.

关键词： Peer to peer computing Approximation algorithms Delay Optimization distributed databases Approximation methods

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Keynote Speech 3: the Era of Big Data and Cognitive computing

Keynote Speech 3: The Era of Big Data and Cognitive Computin...

引用

IEEE international conference on parallel and distributed computing, Applications and Technologies (PDCAT)

作者： Hui Lei International Business Machines Corp Armonk NY US

ISBN: (纸本)9781509050826

Summary form only given. Big data and cognitive computing are driving fundamental changes in technology, business, and society. With its exponentially increasing volume, velocity and variety, big data is hailed as the world's new natural resource. It promises to be for the 21st century what steam power was for the 18th, electricity for the 19th, and oil and gas for the 20th. the biggest value of big data lies in the deep, actionable insights that can be derived from the raw data and leveraged for competitive advantages. Cognitive computing is a key enabling technology for turning big data into insights. Different from the traditional programmable systems, cognitive systems are able to scale and extend human knowledge, reason with purpose, and learn and improve over time. the rise of cognitive systems represents the dawn of a new era of computing, whose focus has shifted from automating the world to understanding the world. In this talk, I will discuss the implications of big data and cognitive computing. I will reflect on our experience at IBM building the Watson Health Cloud, and discuss how big data and cognitive computing can come together to enable innovative health solutions that tackle many of the clinical, societal, and economic issues faced by today's health industry. I will present use cases, highlight the challenges, describe our approaches, and relate to client experiences as appropriate.

关键词： Big Data cognitive systems health care big data cognitive function Health Care bulk velocity

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An index model of global subdivision in cloud computing environment

An index model of global subdivision in cloud computing envi...

引用

international conference on Geoinformatics

作者： An Jin Chengqi Cheng Fuhu Ren Shuhua Song Institute of Remote Sensing and Geographic Information System Peking University Beijing China

ISBN: (纸本)9781612848495

Cloud computing has been widely used in various fields. A typical Google-like infrastructure of cloud computing is usually supported by the following three technologies: a scalable distributed file system like GFS, a structured key-value data store mechanism like Bigtable, and a parallel programming model like MapReduce. this paper presents a multi-level index model based on global subdivision grid in cloud computing environment. Both remote sensing images and spatial objects are indexed. It discusses the design, structure, retrieval and comparison of the index model. the spatial retrieval contains four types: point retrieval, range retrieval, topological retrieval and special grid retrieval. this paper also introduces the design of a prototype system implementing the proposed model, which consists of storage and server layer, service layer, management layer, and application layer.

关键词： Indexes Cloud computing Spatial databases Computational modeling Data models Servers Geographic Information systems

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A high-performance computational resource broker for grid computing environments

A high-performance computational resource broker for grid co...

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international conference on Advanced Information Networking and Applications (AINA)

作者： Chao-Tung Yang Po-Chi Shih Kuan-Ching Li High-Performance Computing Laboratory Department of Computer Science and Tunghai University Taichung Taiwan Parallel and Distributed Processing Center Department of Computer Science and Information Management Providence University Taichung Taiwan

ISBN: (纸本)0769522491

Internet computing and grid technologies promise to change the way we tackle complex problems. they will enable large-scale aggregation and sharing of computational, data and other resources across institutional boundaries. As grid computing is becoming a reality, there is a need for managing and monitoring the available resources worldwide, as well as the need for conveying these resources to the everyday user. this paper describes a resource broker with its main function as to match the available resources to the user's needs. the use of the resource broker provides a uniform interface to access any of the available and appropriate resources using user's credentials. the resource broker runs on top of the Globus toolkit. therefore, it provides security and current information about the available resources and serves as a link to the diverse systems available in the grid.

关键词： Grid computing Resource management Bandwidth distributed computing Network servers Monitoring Information security Middleware Access protocols Java

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Credibility Enhanced Reputation Mechanism for distributed E-communities

Credibility Enhanced Reputation Mechanism for Distributed E-...

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Euromicro conference on parallel, distributed and Network-Based Processing

作者： Eleni Koutrouli Aphrodite Tsalgatidou Department of Informatics & Telecommunications National and Kapodistrian University of Athens Athens Greece

P2P communities are online communities of entities which offer services to each other without a central administration. Community members that need a specific service have to choose the transaction partner which they believe that will provide them with a required service of the expected quality, thus, they need mechanisms to support trust decisions regarding who they will transact with. P2P reputation systems provide trust mechanisms for P2P communities. Due to their decentralized and social nature, they are vulnerable to various types of attacks which distort their credibility and effectiveness. In our paper we first identify the credibility factors of a P2P reputation system. then we describe a dynamic reputation mechanism for P2P communities, which integrates some of these credibility factors and which can be used as part of a comprehensive reputation system enhancing its robustness against some types of attacks. Simulation results show the effectiveness of our mechanism in relation to other reputation mechanisms which do not integrate such factors.

关键词： Communities Peer to peer computing Measurement Collaboration Heuristic algorithms Quality of service Silicon

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