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IEEE international conference on Communications (ICC)

作者： M. E. Rivero-Angeles G. Rubino INRIA Rennes Bretagne Atlantique Rennes France

Peer-to-Peer (P2P) networks are distributed systems where no central authority rules the behavior of the individual peers. A typical application is the sharing of files of some class (movies, music, ...), our object of interest here. These systems relay on the voluntary participation of the peers to help each other. However, it is not uncommon to find users that have initiated a file transfer and decide to leave the system before the end of the download. This is a particularly harmful behavior due to the resources, such as bandwidth or energy, wasted in such an aborted process. This negative effect is amplified when the system's conditions are such that the peers are not downloading at the maximum capacity, i.e., the downloading bandwidth is underutilized. This is because in these conditions, there are not enough peers uploading the file, and a part of the bandwidth is wasted on peers that do not share their resources to the network once they leave the system. In this paper, a priority scheme is presented for a BitTorrent-based P2P network where the peers that are more likely to remain longer in the system are served first, over peers that are statistically more likely to abort the download. By giving priority to peers that are likely to go through the complete file download, the successful download rate for the peers that remain longer in the system is increased and the resources of the system are better utilized. The proposed scheme is analyzed by means of different models, in order to find the steady-state performance of the network.

关键词： Peer to peer computing Bandwidth Communications Society Electronic mail Motion pictures Relays Performance analysis Steady-state Finishing Disruption tolerant networking

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Dynamic computation of population protocols

Dynamic computation of population protocols

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international conference on Telecommunications (ICT)

作者： Marin Bertier Yann Busnel Anne-Marie Kermarrec IRISA / INSA Rennes Universitaire de Beaulieu France LINA University of Nantes Nantes France INRIA Rennes Bretagne Atlantique France

Population protocols provide theoretical foundations for mobile tiny device networks in which global behavior emerges from a set of simple interactions between anonymous agents. The works in this area mostly focus on studying the computational power of the model. Results hold as long as a fair scheduler, which governs the interactions between nodes, ensures that all reachable system states may eventually happen. This paper studies for the first time the impact of the agents' mobility model on the convergence speed of population protocols, emphasizing the dynamic of the computation. We propose an augmented population protocol model where each edge of the interaction graph is weighted, representing the probability of two agents to interact. This model enables to define the behavior of the scheduler under various mobility models. We have empirically shown that mobility models have a significant impact on the convergence speed of the protocols. In fact, we observed that the uniform distribution always provides the best convergence time. Such a model is representative of the well-known Random Way Point model used to evaluate most of mobile ad-hoc network protocols. In this paper, we formally prove that a uniform distribution of weights provides the lowest bound of average convergence speed for a large class of population protocols. Therefore, this analysis reveals that the Random Way Point model, following this distribution, provides the best case scenario questioning its relevance as a reference model.

关键词： Protocols Power system modeling Convergence Disruption tolerant networking Processor scheduling Computer networks Ad hoc networks Mobile ad hoc networks distributed algorithms Telecommunication computing

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ICT BONE views on the Network of the Future: The role of Optical networking

ICT BONE views on the Network of the Future: The role of Opt...

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international conference on Transparent Optical Networks

作者： Christina Politi Anna Tzanakaki Michael O'Mahony Kostas Katrinis Peter Van Daele Mario Pickavet Dimitra Simeonidou Alexandros Stavdas Gerald Franzl John Mitchell Piero Castoldi Salvatore Spadaro Franco Callegatti Periklis Petropoulos Kyriakos Vlachos Achille Pattavina Department of Telecommunications Science and Technology University of Peloponnese Tripoli Greece Athens Information Technology Center Athens Greece University of Essex UK IBBT Ghent University Belgium University of Technology Vienna Vienna Austria Department of Electronic and Electrical Engineering University College London London UK Scuola Superiore Sant'' Anna Pisa Italy Universitat Poliltècnica de Catalunya Barcelona Spain DEIS University of Bologna Cesena Italy Optoelectronics Research Centre University of Southampton Southampton UK Computer Engineering and Informatics Department & Research Academic Computer Technology Institute University of Patras Rio Greece Department of Electronics and Information Politecnico di Milano Italy

Part of the activities of the ICT EU Network of Excellence "Building the future Optical Network in Europe" (BONE) project is the development of the European Roadmap on Optical networking in the context of the "Network of the Future". This paper presents a summary of the views of the BONE consortium as they were developed in the framework of the Roadmap activity. The methodology followed in the development of the BONE Roadmap was firstly to identify and analyse the status of broadband access penetration as well as the availability of specific network and IT technologies in various European countries. The data collected were then processed and translated into the traffic volume (distributed across different European countries) that a Pan-European network would need to support. This information is then used as the basis of a WDM optical network dimensioning exercise performed with the aim of identifying the scale of the required optical network. In addition, based on estimations regarding the evolution of broadband access technologies and the degree of broadband penetration and network services and applications, extrapolations regarding the growth of traffic to be supported by the European Network of the Future were made in a systematic manner. These were also used to dimension and understand the requirements of the European Network of the Future. This paper presents the relevant results and also provides a discussion on the BONE consortium views on the Network of the Future from an architectural and technology perspective and an outlook of the relevant key research challenges and possible solutions.

关键词： Bones Optical fiber networks Europe Availability Computer networks Optical computing Telecommunication traffic Electronic mail Information technology Informatics

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Special Section: Scalable information systems

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FUTURE GENERATION COMPUTER SYSTEMS-THE international JOURNAL OF GRID computing THEORY METHODS AND APPLICATIONS 2009年第1期25卷 51-52页

作者： Lee, Wang-Chien Xu, Jianliang Li, Jianzhong Silvestri, Fabrizio Penn State Univ State Coll PA 16801 USA Hong Kong Baptist Univ Hong Kong Hong Kong Peoples R China Harbin Inst Technol Harbin Peoples R China

As data and knowledge volumes keep increasing, and global means for information dissemination continues to diversify, new methods, modeling paradigms and structures are needed to efficiently support the mounting scalability requirements for the large variety of current and future data, information, and knowledge [1–3]. Grid computing, peer-to-peer technology, data and knowledge bases, distributed information retrieval technology, and networking technology should all converge to address the scalability concern. This special section compiles recent work on addressing scalability issues of distributed and peer-to-peer systems. Selected papers from the Second international conference on Scalable Information Systems (INFOSCALE 2007) were invited for extension and submission to this special section. Finally, five papers were included in this special section.

关键词： Special Section Scalable information systems information retrieval technology Scalability distributed search Computer based information systems peer to peer new methods information retrieval technique networking Techniques international conference Information Dissemination

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An Opportunistic Routing Protocol for Underground Wireless Sensor Networks

An Opportunistic Routing Protocol for Underground Wireless S...

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3rd international Workshop on e-Activity (IWEA2009)/10th ACIS international conference on Software Engineering Artificial Intelligence, networking and Parallel/distributed computing

作者： Joe, Inwhee Kim, Dongik Hanyang Univ Dept Elect & Comp Engn Seoul 133791 South Korea

ISBN: (纸本)9780769536422

Recently, most researches in the area of wireless sensor networks are limited to the ground environment, so the demand for underground wireless sensor networks is increasing. However the underground environment is different from the ground environment in that there are some critical problems in reliability due to the large path loss of the underground. Therefore, in this paper we propose an opportunistic routing protocol for improving the reliability in the underground environment. Through the test-bed experiments the proposed routing protocol is compared with other routing protocols.

关键词： Routing protocols Wireless sensor networks distributed computing Hardware Relays Computer networks Concurrent computing Media Access Protocol Software engineering Artificial intelligence

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An Approach to the Development of Inference Engine for distributed System for Fault Diagnosis

An Approach to the Development of Inference Engine for Distr...

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3rd international Workshop on e-Activity (IWEA2009)/10th ACIS international conference on Software Engineering Artificial Intelligence, networking and Parallel/distributed computing

作者： Prasad, Vinod B. Bradley Univ Peoria IL 61625 USA

ISBN: (纸本)9780769536422

The reliable and fault tolerant computers are key to the success to aerospace, and communication industries. Designing a reliable digital system, and detecting and repairing the faults are challenging tasks in order for the digital system to operate without failures for a given period of time. The paper presents a new and systematic software engineering approach of performing fault diagnosis parallel and distributed computing. The purpose of the paper would be to demonstrate a method to build a fault diagnosis for a parallel and distributed computing. The paper chooses a model posed a tremendous challenge to the user for fault analysis. The model is the classic PMC model that happens to be a parallel and distributed computing. The paper would also show a method for building an optimal inference engine by obtaining sub graphs that also preserve the necessary and sufficient conditions of the model. Coin words: Parallel and distributed computing, Artificial Intelligence

关键词： Artificial intelligence Parallel and distributed computing

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A True Concurrent Process Calculus and Its Conflict Bisimulation

A True Concurrent Process Calculus and Its Conflict Bisimula...

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3rd international Workshop on e-Activity (IWEA2009)/10th ACIS international conference on Software Engineering Artificial Intelligence, networking and Parallel/distributed computing

作者： Cao, Zining Nanjing Univ Aero & Astro Dept Comp Sci & Technol Nanjing 210016 Peoples R China

ISBN: (纸本)9780769536422

In this paper we present a true concurrency variant of pi-calculus. This calculus can describe the simultaneous execution of several atomic actions and the true concurrent execution of several processes. An important character of true concurrency is conflict. When a process encounters a conflict, it cannot evolve into any process. In order to distinguish two processes that one may encounter a conflict, and the other cannot, we propose a concept of conflict bisimulation, two processes are conflict bisimilar if they can not only evolve into conflict bisimilar processes, but also have the Potential of same conflict. In pi-calculus, congruence cannot be preserved under prefix operator but in the case of our true concurrency variant of pi-calculus, the congruence property holds for all operators.

关键词： Calculus Concurrent computing Interleaved codes Mathematical model Software engineering Artificial intelligence Intelligent networks distributed computing Computer science Laboratories

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Analysis of VAN-Core System Architecture - A Case Study of Applying the ATAM

Analysis of VAN-Core System Architecture - A Case Study of A...

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3rd international Workshop on e-Activity (IWEA2009)/10th ACIS international conference on Software Engineering Artificial Intelligence, networking and Parallel/distributed computing

作者： Lee, Jihyun Kang, Sungwon Chun, Hyungchul Park, Byungnyun Lim, Choonbong Korea Adv Inst Sci & Technol Coll Informat Sci & Technol Masters Tower 1501533 Dowhadong Seoul South Korea Crossent Seoul South Korea

ISBN: (纸本)9780769536422

The Architecture Tradeoff Analysis Method (ATAM) is an architecture evaluation technique for analyzing risks, tradeoffs, and sensitivity points of architectures. In this paper we describe an experience of evaluating and improving the architecture of VAN-Core system which requires to run 24 hours a day, 365 days a year, for online credit card transaction services. The goal of the architecture evaluation for VAN-Core system includes establishing risk mitigation strategies for identified risky and suggesting architecture improvements in addition to architecture evaluation.

关键词： Risk analysis Computer architecture Information analysis Credit cards Resource management Software engineering Artificial intelligence Intelligent networks distributed computing Educational institutions

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Nominative Proxy Ring Signature

Nominative Proxy Ring Signature

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3rd international Workshop on e-Activity (IWEA2009)/10th ACIS international conference on Software Engineering Artificial Intelligence, networking and Parallel/distributed computing

作者： Hu, Chengyu Liu, Pengtao Zhang, Guoyan Shandong Univ Sch Comp Sci & Technol Jinan 250100 Peoples R China Shandong Univ Polit Sci & Law Inst Informat Sci & Technol Jian Jiangxi Peoples R China Shandong Univ Sch Control Sci & Engn Jinan Peoples R China

ISBN: (纸本)9780769536422

In a nominative proxy ring signature scheme, an original signer delegates his nominative signing power to some proxies forming a ring. The member of the ring can generate a nominative signature on behalf of the original signer and the ring. In a nominative proxy ring signature scheme, only the nominee can verify the ring signature and if necessary, only the nominee can prove its validity to the third party. In this paper, we present the first nominative proxy ring signature scheme and we prove its security

关键词： Protocols Security Public key Software engineering Artificial intelligence Intelligent networks distributed computing Computer science Information science Power engineering and energy

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A Novel Approach to Find Patterns of Supplier

A Novel Approach to Find Patterns of Supplier

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3rd international Workshop on e-Activity (IWEA2009)/10th ACIS international conference on Software Engineering Artificial Intelligence, networking and Parallel/distributed computing

作者： Xu, Xu Lin, Jie Tongji Univ Sch Econ & Management Shanghai 200092 Peoples R China

ISBN: (纸本)9780769536422

Supplier selection and evaluation are one of the most critical activities of a company in today's competitive business world. Partnering with the suppliers has become a key factor to the success of an organization. The selection of supplier satisfying different evaluation criteria, is therefore of main importance and builds the topic of this paper This selection process is a difficult decision and optimization problem, such as data mining technology. This paper utilizes an integrated approach to find the interesting pattern Of supplier. This research has employed a numerical example for the explanation of the proposed approach, and the results show that the method is effective and applicable for supplier selection. In short, the approach provides a new route to guide the further research concerning supplier research.

关键词： Data envelopment analysis Computer network management conference management Engineering management Companies Expert systems Software engineering Artificial intelligence Intelligent networks Competitive intelligence

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