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2010 3rd International Conference on Human-Centric Computing, HumanCom 2010

作者： Manguni Jr., Reynaldo Navarro, Mel Leandro Rosario, Kathleen Festin, Cedric Angelo Department of Computer Science Networks and Distributed Systems Group University of Philippines Diliman Quezon City Philippines

ISBN: (纸本)9781424475704

Community Health Information Tracking System using Short Message Service (chitSMS) is an extension of CHITS which is a system that stores health records of patients in the barangay. Another project incorporated a mobile component in CHITS, enabling the health worker to visit the patient, do routine check-ups and medical services, and update CHITS when the health worker returns to the health center. Without a remote connection, however, the health worker has to return frequently to the usually distant health center to update the CHITS database with the data gathered from the field consult. chitSMS addresses this by using SMS as a mode of remote data transfer. It ensures the reliable transmission of the data by implementing a modified selective repeat protocol. Furthermore, it performs the Deflate algorithm for compression of the data being sent to minimize the cost. © 2010 IEEE.

关键词： Data transfer

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Building a Long Term Strategy for International Collaboration in Trustworthy ICT: Security, Privacy and Trust in Global networks and Services

Building a Long Term Strategy for International Collaboratio...

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SysSec Workshop (SysSec)

作者： James Clarke Neeraj Suri Michel Riguidel Aljosa Pasic Telecommunications Software and Systems Group Waterford Institute of Technology Waterford Ireland DEEDS Dependable Systems & SW Group Department of Computer Science Technische Universität Darmstadt Darmstadt Germany Groupe Des Ecoles Des Telecommunications Telecom-Paris Tech Paris France Research Department Atos Origin Madrid Spain

This paper contains a summary of a significant amount of findings carried out collectively by a global research community specifically aimed at determining mutually beneficial and hot topics for international collaboration on the research and development of Trustworthy ICT. The paper highlights a sampling of these topics that were deemed to produce the most impact and it provides an introduction to the final recommendations of the INCO-Trust project, which was the main catalyst behind this initiative. The paper doesn't cover the extensive platforms, mechanisms, and systematic consensus building process in working groups based on workshops organised by the project to achieve its goals but instead focuses on the outcomes of the project. The key recommendations of the project will be used as a starting point for the recently start BIC project, whose objective is to include a number of new countries (Brazil, India and South Africa) into this already formed global community of ICT Trust and security researchers.

关键词： Security Conferences Collaboration Communities Internet Economics Privacy

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Early Identification of Peer-to-Peer Traffic

Early Identification of Peer-to-Peer Traffic

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IEEE International Conference on Communications (ICC)

作者： Bela Hullar Sandor Laki Andras Gyorgy Department of Physics of Complex Systems Eötvös Lonránd University Budapest Hungary Department of Information Systems Eötvös Lonránd University Budapest Hungary Machine Learning Research Group MTA SZTAKI Institute of Computer Science and Control Budapest Hungary

To manage and monitor their networks in a proper way, network operators are often interested in identifying the applications generating the traffic traveling through their networks, and doing it as fast (i.e., from as few packets) as possible. State-of-the-art packet-based traffic classification methods are either based on the costly inspection of the payload of several packets of each flow or on basic flow statistics that do not take into account the packet content. In this paper we consider the intermediate approach of analyzing only the first few bytes of the first (or first few) packets of each flow. We propose automatic, machine-learning-based methods achieving remarkably good early classification performance on real traffic traces generated from a diverse set of applications (including several versions of P2P TV and file sharing), while requiring only limited computational and memory resources.

关键词： Protocols Payloads Markov processes Training Wireless LAN Radio frequency Algorithm design and analysis

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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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distributed creation and adaptation of random scale-free overlay networks

Distributed creation and adaptation of random scale-free ove...

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2010 4th IEEE International Conference on Self-Adaptive and Self-Organizing systems, SASO 2010

作者： Scholtes, Ingo Systemsoftware and Distributed Systems Group Department of Computer Science University of Trier D-54286 Trier Germany

ISBN: (纸本)9780769542324

Random scale-free overlay topologies provide a number of properties like for example high resilience against failures of random nodes, small (average) diameter as well as good expansion and congestion characteristics that make them interesting for the use in large-scale distributed systems. A number of these properties have been shown to be influenced by the exponent of their power law degree distribution. In this article, we present a distributed rewiring scheme that is suitable to effectuate random scale-free overlay topologies with an adjustable degree distribution exponent. The scheme uses a biased random walk strategy to sample new endpoints of edges being rewired and relies on an equilibrium model for scale-free networks. The bias of the random walk strategy can be tuned to produce random scale-free networks with arbitrary degree distribution exponents greater than two. We argue that the rewiring strategy can be implemented in a distributed fashion based on a node's information about its immediate neighbors. We present both analytical arguments as well as results that have been obtained in simulations of the proposed protocol. © 2010 IEEE.

关键词： Overlay networks

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Editor's note

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IEEE Transactions on Parallel and distributed systems 2010年第5期21卷 577-578页

作者： Stojmenovic, Ivan Guo, Minyi Jia, Weijia Kshemkalyani, Ajay Liu, Yunhao Mišiç, Vojislav B. Sun, Xian-He China Department of Computer Science ShenZhen Research Institute City University of Hong Kong Hong Kong Computer Networks and Concurrent Systems United States Department of Computer Science and Engineering Hong Kong University of Science and Technology Hong Kong Computer Science and Technology Department Tsinghua University China Department of Computer Science Ryerson University in Toronto ON Canada Department of Computer Science Illinois Institute of Technology United States

The article discusses issues related to the editorial board of the journal, including the outcome of the open meeting held by the board at the Institute of Electrical and Electronics Engineers (IEEE) International Par... 详细信息

关键词： CONFERENCES & conventions PERIODICAL editors

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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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Parallel packet classification using GPU co-processors

Parallel packet classification using GPU co-processors

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2010 Annual research Conference of the South African Institute of computer Scientist and Information Technologists, SAICSIT 2010

作者： Nottingham, Alastair Irwin, Barry Security and Networks Research Group Department of Computer Science Rhodes University Grahamstown South Africa

ISBN: (纸本)9781605589503

In the domain of network security, packet filtering for classification purposes is of significant interest. Packet classification provides a mechanism for understanding the composition of packet streams arriving at distinct network interfaces, and is useful in diagnosing threats and uncovering vulnerabilities so as to maximise data integrity and system security. Traditional packet classifiers, such as PCAP, have utilised Control Flow Graphs (CFGs) in representing filter sets, due to both their amenability to optimisation, and their inherent structural applicability to the metaphor of decision-based classification. Unfortunately, CFGs do not map well to cooperative processing implementations, and single-threaded CPU-based implementations have proven too slow for real-time classification against multiple arbitrary filters on next generation networks. In this paper, we consider a novel multithreaded classification algorithm, optimised for execution on GPU co-processors, intended to accelerate classification throughput and maximise processing efficiency in a highly parallel execution context. © 2010 ACM.

关键词： Packet networks

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A taxonomy of autonomic application management in grids

A taxonomy of autonomic application management in grids

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16th IEEE International Conference on Parallel and distributed systems, ICPADS 2010

作者： Rahman, Mustafizur Ranjan, Rajiv Buyya, Rajkumar Cloud Computing and Distributed Systems Laboratory Department of Computer Science and Software Engineering University of Melbourne Australia Service Oriented Computing Research Group School of Computer Science and Engineering University of New South Wales Australia

ISBN: (纸本)9780769543079

In this paper, we propose a taxonomy that characterizes and classifies different components of autonomic application management in Grids. We also survey several representative Grid systems developed by various projects world-wide to demonstrate the comprehensiveness of the taxonomy. The taxonomy not only highlights the similarities and differences of state-of-the-art technologies utilized in autonomic application management from the perspective of Grid computing, but also identifies the areas that require further research initiatives. © 2010 IEEE.

关键词： Surveys

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Validating mobility management solutions for interworking UMTS and IEEE 802.11 networks

Validating mobility management solutions for interworking UM...

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2010 17th International Conference on Telecommunications, ICT 2010

作者： Nogueira, Antonia Diana B. Ramos, Luana P. De Castro, Miguel F. Andrade, Rossana M. C. Computer Science Department GREat - Research Group on Computer Networks Software Engineering and Systems Federal University of Ceará Campus do Pici - Bloco 942-A 60.455-760 - Fortaleza-CE Brazil

ISBN: (纸本)9781424452477

An important step towards seamless heterogeneous systems is the integration between WLAN and 3G cellular systems. Their interoperability has been frequently discussed in literature, however, there is still room for research in this issue. Since IEEE 802.11 networks reach relatively high data transmission rates when compared to other wireless networks, it has gained the attention of the cellular networks operators, such as UMTS operators, which have been considering IEEE 802.11 networks as a complement to their access networks. Notwithstanding, specification and development of real-time systems with mobility support are still a challenge due to their characteristic of criticality and safety. In this context, formal methods have shown effectiveness in real-time system development. The main advantage of formal methods is allowing a rigorous and nonambiguous system description. Thus, this work presents the specification and validation of two mobility management approaches to integrate UMTS and IEEE 802.11 networks: the first one is based on SIP, and the other one is based on MIP version 6. These specifications extend the Loose Interworking architecture and reach the fourth integration level of the 3GPP specification. These approaches are modeled using SDL and MSC formal description techniques, which are largely used to specify telecommunications systems. SDL also provides simulation and validation results that are analyzed to evaluate the proposed approaches with the goal of proving that formal methods can lead to a more precise and correct final system. © 2009 IEEE.

关键词： Real time systems

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