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2011 IEEE Asia-Pacific Services Computing Conference, APSCC 2011

作者： Truong, Hong-Linh Dustdar, Schahram Götze, Joachim Fleuren, Tino Müller, Paul Tbahriti, Salah-Eddine Mrissa, Michael Ghedira, Chirine Distributed Systems Group Vienna University of Technology Austria Department of Computer Science University of Kaiserslautern Germany Université de Lyon CNRS UMR5205 France

ISBN: (纸本)9780769546247

Rich types of data offered by data as a service (DaaS) in the cloud are typically associated with different and complex data concerns that DaaS service providers, data providers and data consumers must carefully examine and agree with before passing and utilizing data. Unlike service agreements, data agreements, reflecting conditions established on the basis of data concerns, between relevant stakeholders have got little attention. However, as data concerns are complex and contextual, given the trend of mixing data sources by automated techniques, such as data mashup, data agreements must be associated with data discovery, retrieval and utilization. Unfortunately, exchanging data agreements so far has not been automated and incorporated into service and data discovery and composition. In this paper, we analyze possible steps and propose interactions among data consumers, DaaS service providers and data providers in exchanging data agreements. Based on that, we present a novel service for composing, managing, analyzing data agreements for DaaS in cloud environments and data marketplaces. © 2011 IEEE.

关键词： E-discovery Automated recording Data sources data types

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EMMON: A WSN system architecture for large scale and dense real-time embedded monitoring

EMMON: A WSN system architecture for large scale and dense r...

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2011 IFIP 9th International Conference on Embedded and Ubiquitous Computing, EUC 2011

作者： Tennina, Stefano Bouroche, Mélanie Braga, Pedro Gomes, Ricardo Alves, Mario Mirza, Farrukh Ciriello, Vincenzo Carrozza, Gabriella Oliveira, Pedro Cahill, Vinny Porto Portugal Distributed Systems Group Department of Computer Science Trinity College Dublin Ireland Critical Software Coimbra Portugal SESM Scarl Giugliano in Campania Naples Italy

ISBN: (纸本)9780769545523

Wireless sensor networks (WSNs) have attracted growing interest in the last decade as an infrastructure to support a diversity of ubiquitous computing and cyber-physical systems. However, most research work has focused on protocols or on specific applications. As a result, there remains a clear lack of effective, feasible and usable system architectures that address both functional and non-functional requirements in an integrated fashion. In this paper, we outline the EMMON system architecture for large-scale, dense, real-time embedded monitoring. EMMON provides a hierarchical communication architecture together with integrated middleware and command and control software. It has been designed to use standard commercially-available technologies, while maintaining as much flexibility as possible to meet specific applications requirements. The EMMON architecture has been validated through extensive simulation and experimental evaluation, including a 300+ node test-bed, which is, to the best of our knowledge, the largest single-site WSN test-bed in Europe to date. © 2011 IEEE.

关键词： Wireless sensor networks

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BitTorrent's dilemma: Enhancing reciprocity or reducing inequity

BitTorrent's dilemma: Enhancing reciprocity or reducing ineq...

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Consumer Communications and Networking Conference, CCNC IEEE

作者： Adele L. Jia Lucia D'Acunto Michel Meulpolder Johan A. Pouwelse Dick H. J. Epema Parallel and Distributed Systems Group Department of Computer Science Delft University of Technology The Netherlands Technische Universiteit Delft Delft Zuid-Holland NL

Enhancing reciprocity has been one of the primary motivations for the design of incentive policies in BitTorrent-like P2P systems. Reciprocity implies that peers need to contribute their bandwidth to other peers if they want to receive bandwidth in return. However, the over-provisioning that characterizes today's BitTorrent communities and the development of many next-generation P2P systems with real-time constraints (e.g., for live and on-demand streaming) suggest that more effort can be devoted to reducing the inequity (i.e., the difference of service received) among peers, rather than only enhancing reciprocity. Inspired by this observation, in this work we analyze in detail several incentive mechanisms that are used in BitTorrent systems, and explore several strategies that influence the balance between reciprocity and equity. Our study shows that (i) reducing inequity leads to a better overall system performance, and (ii) the behavior of seeders (i.e., peers that hold a complete copy of the file and upload it for free) influences whether reciprocity is enhanced or inequity reduced.

关键词： Thin film transistors Bandwidth Analytical models Peer to peer computing Protocols Channel allocation Steady-state

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Model-driven design plus artificial intelligence for wireless sensor networks software development

Model-driven design plus artificial intelligence for wireles...

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2nd International Workshop on Software Engineering for Sensor Network Applications, SESENA 2011, in Conjunction with the International Conference on Software Engineering, ICSE 2011

作者： Mülders, Peter Gruner, Stefan Thang, Nguyen Xuan Research Group for Software Science and Formal Methods Department of Computer Science Universiteit Van Pretoria Lynnwood Road 0002 Pretoria South Africa Distributed Systems Group Faculty of Electr. and Inform. University of Kassel Wilhelmshöher Allee 73 34121 Kassel Germany

ISBN: (纸本)9781450305839

To date, software development for wireless sensor network nodes is still characterized by low-level ad-hoc programming to a large extent. This short-paper argues for a methodologically more systematic approach on the basis of Model-Driven Engineering with CASE-Tool support, in combination with AI-based design choice optimizations during the MDE-steps of model-refinement and information-enrichment. Our work in this project is ongoing. © 2011 ACM.

关键词： Genetic algorithms

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ANCAEE: A Novel Clustering Algorithm for Energy Efficiency in Wireless Sensor Networks

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Wireless Sensor Network 2011年第9期3卷 307-312页

作者： A. P. Abidoye N. A. Azeez A. O. Adesina K. K. Agbele Wireless Sensor Networks & Natural Language Research Group Grid Computing & Distributed Systems Laboratory Department of Computer Science University of the Western Cape

One of the major constraints of wireless sensor networks is limited energy available to sensor nodes because of the small size of the batteries they use as source of power. Clustering is one of the routing techniques that have been using to minimize sensor nodes’ energy consumption during operation. In this paper, A Novel Clustering Algorithm for Energy Efficiency in Wireless Sensor Networks (ANCAEE) has been proposed. The algorithm achieves good performance in terms of minimizing energy consumption during data transmission and energy consumptions are distributed uniformly among all nodes. ANCAEE uses a new method of clusters formation and election of cluster heads. The algorithm ensures that a node transmits its data to the cluster head with a single hop transmission and cluster heads forward their data to the base station with multi-hop transmissions. Simulation results show that our approach consumes less energy and effectively extends network utilization.

关键词： Sensor Nodes Clusters Cluster heads Wireless Sensor Networks Base Station Clustering Algorithms Energy Efficiency

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Exchanging Data Agreements in the DaaS Model

Exchanging Data Agreements in the DaaS Model

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IEEE Asia-Pacific Conference on Services Computing (APSCC)

作者： Hong-Linh Truong Schahram Dustdar Joachim Gotze Tino Fleuren Paul Muller Salah-Eddine Tbahriti Michael Mrissa Chirine Ghedira Distributed Systems Group University of Technology Vienna Austria Department of Computer Science University of Kaiserslautern Germany LIRIS UMR5205 Université de Lyon CNRS France

Rich types of data offered by data as a service(DaaS) in the cloud are typically associated with different and complex data concerns that DaaS service providers, data providers and data consumers must carefully examine and agree with before passing and utilizing data. Unlike service agreements, data agreements, reflecting conditions established on the basis of data concerns, between relevant stakeholders have got little attention. However, as data concerns are complex and contextual, given the trend of mixing data sources by automated techniques, such as data mash up, data agreements must be associated with data discovery, retrieval and utilization. Unfortunately, exchanging data agreements so far has not been automated and incorporated into service and data discovery and composition. In this paper, we analyze possible steps and propose interactions among data consumers, DaaS service providers and data providers in exchanging data agreements. Based on that, we present a novel service for composing, managing, analyzing data agreements for DaaS in cloud environments and data marketplaces.

关键词： Data models Licenses Joining processes Couplings Data privacy Data structures Law enforcement

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Public and private BitTorrent communities: A measurement study 9

Public and private BitTorrent communities: A measurement stu...

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9th International Workshop on Peer-to-Peer systems, IPTPS 2010

作者： Meulpolder, M. D'Acunto, L. Capotă, M. Wojciechowski, M. Pouwelse, J.A. Epema, D.H.J. Sips, H.J. Parallel and Distributed Systems Group Department of Computer Science Delft University of Technology Netherlands

BitTorrent communities, both public and private, are immensely popular in the Internet, with tens of millions of users simultaneously active at any given moment. Public and private BitTorrent communities are managed in different ways - for instance, some private communities enforce sharing ratios, have strict rules for content management, have a certain level of community oversight, and maintain a strong sense of exclusiveness. In this paper, we present the results of extensive measurements of more than half a million peers in five communities, ranging from highly popular and well-known public communities to elite private communities that can only be joined by invitation. We observe that the performance experienced by downloaders in the private communities is by far superior to the performance in the public communities, and we observe significant differences in connectability, seeder/leecher ratio, and seeding duration. Based on our results, we conjecture that when effective ratio enforcement mechanisms are in place, BitTorrent's tit-for-tat mechanism is hardly influential anymore. Our multi-community, multi-swarm measurements are significantly broader and more extensive than any earlier measurement study on BitTorrent. © IPTPS *** right reserved.

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Improving accuracy and coverage in an internet-deployed reputation mechanism

Improving accuracy and coverage in an internet-deployed repu...

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2010 IEEE 10th International Conference on Peer-to-Peer Computing, P2P 2010

作者： Delaviz, Rahim Andrade, Nazareno Pouwelse, Johan A. Parallel and Distributed Systems Group Department of Computer Science Delft University of Technology Netherlands

ISBN: (纸本)9781424471416

P2P systems can benefit from reputation mechanisms to promote cooperation and help peers to identify good service providers. However, in spite of a large number of proposed reputation mechanisms, few have been investigated in real situations. BarterCast is a distributed reputation mechanism used by our Internet-deployed Bittorent-based file-sharing client Tribler. In BarterCast, each peer uses messages received from other peers to build a weighted, directed subjective graph that represents the upload and download activity in the system. A peer calculates the reputations of other peers by applying the maxflow algorithm to its subjective graph. For efficiency reasons, only paths of at most two hops are considered in this calculation. In this paper, we identify and assess three potential modifications to BarterCast for improving its accuracy and coverage (fraction of peers for which a reputation value can be computed). First, a peer executes maxflow from the perspective of the node with the highest betweenness centrality in its subjective graph instead of itself. Second, we assume a gossiping protocol that gives each peer complete information about upload and download activities in the system, and third, we lift the path length restriction in the maxflow algorithm. To assess these modifications, we crawl the Tribler network and collect the upload and download actions of the peers for three months. We apply BarterCast with and without the modifications on the collected data and measure accuracy and coverage. ©2010 IEEE.

关键词： Peer to peer networks

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EMMON: A WSN System Architecture for Large Scale and Dense Real-Time Embedded Monitoring

EMMON: A WSN System Architecture for Large Scale and Dense R...

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IEEE/IFIP International Conference on Embedded and Ubiquitous Computing, EUC

作者： Stefano Tennina Melanie Bouroche Pedro Braga Ricardo Gomes Mario Alves Farrukh Mirza Vincenzo Ciriello Gabriella Carrozza Pedro Oliveira Vinny Cahill CISTER Research Center Polytechnic Institute of Porto Porto Portugal Distributed Systems Group Department of Computer Science Trinity College Dublin Dublin Ireland Critical Software S. A. Coimbra Portugal SESM scarl Naples Italy

关键词： Wireless sensor networks computer architecture Protocols Middleware Monitoring Peer to peer computing Scalability

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Performance evaluation of a Python implementation of the new LEDBAT congestion control algorithm

Performance evaluation of a Python implementation of the new...

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17th IEEE International Conference on Automation, Quality and Testing, Robotics, AQTR 2010

作者： Andreica, Mugurel Ionuţ Ţâpuş, Nicolae Pouwelse, Johan Computer Science Department Politehnica University of Bucharest Romania Parallel and Distributed Systems Group Delft University of Technology Netherlands

ISBN: (纸本)9781424467259

LEDBAT is a new congestion control algorithm which was proposed in an IETF draft in March 2009. LEDBAT's goal is to provide a less-than-best-effort data transport service, i.e. a LEDBAT flow should back-off in the presence of other competing flows (TCP flows in particular). Because of its intended friendliness to competing flows, LEDBAT has already been implemented in the popular Bittorrent client uTorrent. In this paper we present performance evaluation results for our Python implementation of LEDBAT. We ran tests both in emulated networks as well as in real world networks. One of the tests involved approximately 300 volunteers spread throughout the world.

关键词： Python

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