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IEEE Conference on computer Communications Workshops, INFOCOM 2010

作者： Trifunovic, Sacha Legendre, Franck Anastasiades, Carlos Computer Engineering and Networks Laboratory ETH Zurich Switzerland Computer Networks and Distributed Systems Group University of Bern Switzerland

ISBN: (纸本)9781424467396

Opportunistic networks enable mobile users to participate in various social interactions with applications such as content distribution and micro-blogs. Because of their distributed nature, securing user interactions relies rather on trust than hard cryptography. Trust is often based on past user interactions such as in reputation systems relying on ratings. Yet, a more fundamental trust, social trust - assessing a user is genuine with honest intentions - must be established beforehand as many identities can be created easily (i.e., sybils). By leveraging the social network structure and its dynamics (conscious secure pairing and wireless contacts), we propose two complementary approaches for social trust establishment: explicit social trust and implicit social trust. Complexity, trust propagation and security issues are evaluated using real world complex graphs, synthetic mobility models and mobility traces. We show how our approach limits the maximum number of sybils independently of the network size and is more robust against manipulation attacks compared to state-of-the-art approaches such as PGP-like certification chains and distributed community detection algorithms. ©2010 IEEE.

关键词： Complex networks

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Improving range query performance on historic web page data

Improving range query performance on historic web page data

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5th Annual ChinaGrid Conference, ChinaGrid 2010

作者： Li, Geng Peng, Bo Lab. of Computer Networks and Distributed Systems Peking University Beijing China

ISBN: (纸本)9780769541068

This paper is about the performance of range queries on historic web page data set, i.e. requests into a data set of web pages that keeps record of historic versions of HTML data of URLs on the web for a subset of data, the URLs and the timestamps of which satisfy the query conditions. To keep track of all versions of every web URL, the data set could easily scale up to terabytes. Hence, systems providing query services to such a data set would require much computing resource. We show that in this scenario data storage layout has significant impact on query performance and propose storage design principles for performance improvement through quantitative approaches. © 2010 IEEE.

关键词： Websites

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chitSMS: Community health information tracking system using short message service

chitSMS: Community health information tracking system using ...

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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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Flexible resource management for Self-X systems: An evaluation

Flexible resource management for Self-X systems: An evaluati...

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2010 13th IEEE International Symposium on Object/Component/Service-Oriented Real-Time distributed Computing Workshops, ISORC Workshops 2010

作者： Oberthür, Simon Zaremba, Leszek Lichte, Hermann Simon Department of Design of Distributed Embedded Systems Heinz Nixdorf Institute University of Paderborn Paderborn Germany Computer Networks Group University of Paderborn Paderborn Germany

ISBN: (纸本)9780769540382

In classical real-time systems the resources for an application are allocated at system start so that every resource request can be fulfilled in future. This would lead to much internal waste of resources in the case of modern Self-X systems, because these systems have highly dynamic resource consumptions. The Flexible Resource Manager (FRM) was developed to overcome this problem. The manager puts temporarily unused resources at other applications' disposal. In this paper the FRM approach is evaluated by concrete application examples and randomly generated applications. © 2010 IEEE.

关键词： Real time systems

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Improving Range Query Performance on Historic Web Page Data

Improving Range Query Performance on Historic Web Page Data

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ChinaGrid Annual Conference (ChinaGrid)

作者： Geng Li Bo Peng Lab of Computer Networks and Distributed Systems Peking University Beijing China

关键词： Web pages distributed databases Indexing Hard disks Optimization

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An approach for selective beacon forwarding to improve cooperative awareness

An approach for selective beacon forwarding to improve coope...

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2010 IEEE Vehicular Networking Conference, VNC 2010

作者： Schmidt, Robert K. Lasowski, Robert Leinmüller, Tim Linnhoff-Popien, Claudia Schäfer, Günter DENSO Automotive Deutschland GmbH Germany Institute for Mobile and Distributed Systems Ludwig Maximilian University of Munich Germany Telematics/Computer Networks Research Group Technical University of Ilmenau Germany

ISBN: (纸本)9781424495252

Cooperative awareness is established by vehicles exchanging their status frequently. In situations where a high number of vehicles access the communication channel with high frequency, communication and cooperative awareness suffer from increased packet loss. So far, forwarding of beacons focuses on extending the range of V2V communication which is not necessarily needed in most scenarios. In this paper, we motivate selective beacon forwarding to improve the reliability of cooperative awareness in high load situations. We define a metric to measure the quality of cooperative awareness and compare different static beacon rates by a simulation study. Especially in high load situations, we evaluate selective forwarding of beacons to overcome the awareness degradation due to interference, leading to packet loss even at short distances. We show that our approach causes only slight overhead in terms of additional messages and that the age of forwarded information is less than half the beacon interval. © 2010 IEEE.

关键词： Packet loss

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chitSMS: Community Health Information Tracking System Using Short Message Service

chitSMS: Community Health Information Tracking System Using ...

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International Conference on Human-Centric Computing (HumanCom)

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

关键词： Databases Protocols Servers Mobile communication Java Receivers Synchronization

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An approach for selective beacon forwarding to improve cooperative awareness

An approach for selective beacon forwarding to improve coope...

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IEEE Vehicular Networking Conference (VNC)

作者： Robert K. Schmidt Robert Lasowski Tim Leinmüller Claudia Linnhoff-Popien Günter Schäfer DENSO AUTOMOTIVE Deutschland GmbH Germany Institute for Mobile and Distributed Systems Ludwig Maximilian University of Munich Germany Telematics/Computer Networks Research Group Technical University of Ilmenau Germany

关键词： Vehicles Interference Shadow mapping Load modeling Safety Delay

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Wireless multi-hop network scenario emulation by controlling maximal error

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中国高等学校学术文摘·电气与电子工程 2009年第2期4卷 173-180页

作者： Huizhou ZHAO Xiaoming LI Wei YAN Computer Networks and Distributed Systems Laboratory Peking University Beijing 100871 China

A fundamental problem about Ad-hoc network emulation is how to emulate a wireless multi-hop network scenario in a fixed testbed, which, however, is scarcely discussed in depth by existing radio frequency (RF)control wireless network emulators. Therefore, in this article, we first formulate the wireless multi-hop scenario emulation problem based on RF-control, take controlling the maximal error as the solution mentality, and present an algorithm called the matching exact-solution condition algorithm. The experiment results show that the algorithm can solve the wireless multi-hop network scenario emulation problem and maximal error can be achieved.

关键词： computer architecture wireless multi-hop network emulation algorithm matching exact-solution condition algorithm network scenario emulation

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Peer-to-peer solutions for cellular networks

Peer-to-peer solutions for cellular networks

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1st International Conference on Advances in P2P systems, AP2PS 2009

作者： Berl, Andreas De Meer, Hermann Hoßfeld, Tobias Deparment of Computer Networks and Communications University of Passau Germany Department of Distributed Systems University of Würzburg Germany

ISBN: (纸本)9780769538310

The participation of stationary computers with highbandwidth links in peer-to-peer content-distribution networks is highly popular. Mobile devices (e.g. cell phones), however, could not yet be launched into the field to a satisfactory extent. This paper discusses mobile peer-to-peer approaches that cover this issue and compares two promising approaches in detail. The first approach supports mobile devices by adding new infrastructure elements to the mobile network operator's domain. In the second approach, voluntary peers provide support for mobile devices. Both approaches are able to foster the integration of mobile devices into peer-to-peer networks with a large user community. © 2009 IEEE.

关键词： Peer to peer networks

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