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IEEE International Conference on Automation, Quality and Testing, Robotics, AQTR

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

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： Peer to peer computing Testing Control systems Delay estimation Delay effects Streaming media computer science Radio access networks Performance evaluation Time measurement

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Some Thoughts on the Legal Background of the Continuously Increasing Privacy Risk in Information systems and on How to Deal with It

Some Thoughts on the Legal Background of the Continuously In...

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International Conference on Advanced Information Networking and Applications Workshops (AINAW)

作者： Gerald Quirchmayr Chrsitopher C. Wills School of Computer and Information Science University of South Australia Mawson Lakes Australia Department of Distributed and Multimedia Systems University of Technology Vienna Vienna Austria Faculty of Computing Information Systems and Mathematics Kingston University Kingston Upon Thames UK

This paper tries to give an overview of the rising concerns raised by the issue of privacy protection that is associated with the European Data Retention Directive. After relating this risk to the requirements as stated in the European Data Protection Directive, an approach for a security-integrated view on the design of information systems is discussed. The paper then finishes with an outlook on the possible impact on IT governance.

关键词： Law Legal factors Information systems Data privacy Protection Government Surveillance Humans Terrorism computer networks

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Arogyashree: A distributed file system for large scale internet-based telemedicine

Arogyashree: A distributed file system for large scale inter...

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1st International Workshop on Mobilizing Health Information to Support Healthcare-Related Knowledge Work, MobiHealthInf 2009 In Conjunction with BIOSTEC 2009

作者： Ponnavaikko, Kovendhan Janakiram, D. Distributed and Object Systems Lab Department of Computer Science and Engineering Indian Institute of Technology Madras Chennai India

ISBN: (纸本)9789898111784

Today, a typical telemedicine system involves a small set of hospitals providing remote healthcare services to a small section of the society using nodal centers, mobile health units, etc. However, the benefits of a telemedicine system increase with scale. One of the key requirements of such a large scale system is to allow large numbers of patient medical records, in the form of electronic files, to be efficiently stored and accessed from widely distributed locations. In this paper, we address the need for a distributed file system to manage patient data in large scale telemedicine systems. We use the resources of unreliable Internet edge nodes distributed among hospitals, labs, etc., to provide reliable file system services to patients and doctors. Besides building an Internet-based system that scales with the number of nodes and files, we also attempt to optimize record access times for doctors to provide timely responses.

关键词： Hospitals

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A Lie group based Gaussian mixture model distance measure for multimedia comparison 09

A Lie group based Gaussian mixture model distance measure fo...

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1st International Conference on Internet Multimedia Computing and Service, ICIMCS 2009

作者： Gong, Liyu Wang, Tianjiang Yu, Yan Liu, Fang Hu, Xiangen Intelligent and Distributed Computing Lab. School of Computer Science and Technology Huazhong University of Science and Technology Wuhan Hubei 430074 China Department of Information and Computing Science School of Science Wuhan University of Science and Technology Wuhan Hubei 430065 China Department of Psychology Institute for Intelligent Systems University of Memphis Memphis TN 38152 United States

ISBN: (纸本)9781605588407

In this paper, we propose a novel method to measure the distance between two Gaussian Mixture Models. The proposed distance measure is based on the minimum cost that must paid to transform from one Gaussian Mixture Model into the other. We parameterize the components of a Gaussian Mixture Model which are Gaussian probability density functions (pdf) as positive definite lower triangular transformation matrices. Then we identify that Gaussian pdfs form a Lie group. Based on Lie group theory, the geodesic length can be used to measure the minimum cost that must paid to transform from one Gaussian pdf into the other. Combining geodesic length with the earth mover's distance, we propose the Lie group earth mover's distance for Gaussian Mixture Models. We test our distance measure in image retrieval. The experimental results indicate that our distance measure is more effective than other measures including the Kullback-Liebler divergence. Copyright 2009 ACM.

关键词： Probability density function

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The edge node file system: A distributed file system for high performance computing

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Scalable Computing 2009年第1期10卷 115-130页

作者： Ponnavaikko, Kovendhan Janakiram, D. Distributed and Object Systems Lab Department of Computer Science and Engineering Indian Institute of Technology Madras Chennai India

The concept of using Internet edge nodes for High Performance Computing (HPC) applications has gained acceptance in recent times. Many of these HPC applications also have large I/O requirements. Consequently, an edge node file system that efficiently manages the large number of files involved can assist in improving application performance significantly. In this paper, we discuss the design of a distributed File System (DFS) specialized for HPC applications that exploits the storage, computation and communication capabilities of Internet edge nodes and empowers users with the autonomy to flex file management strategies to suit their needs. © 2009 SCPE.

关键词： File organization

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Evaluation of P2P overlays for aoi management in distributed virtual environments

Evaluation of P2P overlays for aoi management in distributed...

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2009 International Conference on Ultra Modern Telecommunications and Workshops

作者： Bettinger, Christian Oechsle, Rainer Esch, Markus Schloss, Hermann Sturm, Peter Trier University of Applied Sciences Department of Computer Science D-54293 Trier Germany University of Luxembourg Faculty of Sciences Technology and Communication 1359 Luxembourg Luxembourg University of Trier System Software and Distributed Systems D-54286 Trier Germany

ISBN: (纸本)9781424439416

Client/Server-based DVE approaches incur scalability and load balancing problems while addressing massive number of users. In order to mitigate these problems P2P overlays are proposed for content provision and management issues instead. However, content provision and management in a distributed manner is much more complicated and requires an exhaustive study of overlay network properties. In order to investigate which kinds of overlay networks suit the requirements stated by DVEs at best, we have performed a comparative evaluation of the deterministic DHT-based Tapestry overlay and the nondeterministic prefix-tree-based P-Grid overlay considering their data location performance and construction cost. In this paper we discuss these evaluation results and exemplarily show how AoI management and content provision can be realized by using the P-Grid overlay. ©2009 IEEE.

关键词： Overlay networks

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P systems and context-free 2D picture languages

P systems and context-free 2D picture languages

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International Conference on Bio-Inspired Computing: Theories and Applications, BICTA

作者： K.G. Subramanian Linqiang Pan See Keong Lee Atulya K. Nagar School of Mathematical Sciences Universiti Sains Islam Malaysia Penang Malaysia Huazhong University of Science and Technology China Intelligent and Distributed Systems Laboratory Department of Computer Science Liverpool Hope University UK

In membrane computing, P system has proved to be a rich framework for handling a variety of problems arising in different areas. In this note we examine an array-rewriting P system for rectangular picture array generation. This system makes use of Pure 2D context-free grammar rules in its regions. We obtain certain comparison results that bring out the suitability of this P system model in increasing the generative power of picture generation.

关键词： Power generation Biomembranes Power system modeling distributed computing Biology computing Biological system modeling Concurrent computing Phased arrays Intelligent systems Laboratories

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Evaluation of P2P overlays for AoI management in distributed Virtual Environments

Evaluation of P2P overlays for AoI management in Distributed...

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International Conference on Ultra Modern Telecommunications and Workshops (ICUMT)

作者： Christian Bettinger Rainer Oechsle Markus Esch Hermann Schloss Peter Sturm Department of Computer Science Trier University of Applied Sciences Trier Germany Faculty of Sciences Technology and Communication University of Luxembourg Luxembourg System Software and Distributed Systems University of Trier Trier Germany

关键词： Environmental management Virtual environment Avatars Content management Scalability Load management Surges Information retrieval Spine technology management

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Semantically supported SLA negotiation

Semantically supported SLA negotiation

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International Workshop on Grid Computing

作者： András Micsik Henar Muñoz Frutos Ioannis Kotsiopoulos Bastian Koller Department of Distributed Systems MTA SZTA Budapest Hungary Telefónica Investigaciòn y Desarrollo Madrid Spain School of Computer Science University of Manchester Institute of Science and Technology Manchester UK High Performance Computing Center Stuttgart University of Stuttgart Stuttgart Germany

The evolution of services market raises the need for automatic support for negotiating service use criteria. In order to reach an agreement, the negotiating parties need to develop a common understanding of the Quality of Service (QoS) terms which are part of the Service Level Agreement (SLA). The use of semantic annotations together with reasoning can increase the level of flexibility and automation in SLA management. A framework is presented for SLA negotiation allowing the two parties to use their own terminologies.

关键词： Ontologies Web services Terminology Quality of service Measurement units computer science High performance computing Automation Semantic Web Vocabulary

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Molecular communication: biological communications technology

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Journal of the National Institute of Information and Communications technology 2008年第4期55卷 75-93页

作者： Tadashi, Nakano Moore, Michael Akihiro, Enomoto Tatsuya, Suda Department of Computer Science University of California Irvine United States Internet Technology Molecular Communication Australia Computer Systems and Networking Design and Development of Communication Systems Using Biological Molecules United States Distributed Systems Sensor Networks Molecular Communication Germany

This article provides a comprehensive overview of state-of-the art research on molecular communication-a molecule-based communication paradigm for biological machines. Unlike current telecommunications based on electric or optical signals, molecular communication exploits biological molecules as information carriers. In molecular communication, senders of communication encode information onto molecules and transmit to the environment. The information coded molecules then propagate in the environment to reach receivers of communication, which capture and biochemically react to the molecules (i.e., decode the information from the information carrying molecules). Since biological molecules are compatible with biological systems, molecular communication is expected to impact medical domains such as human health monitoring where implant biological machines interact with biological cells through molecular communication. This article describes key concepts, architecture, potential applications of molecular communication as well as existing research on engineering molecular communication components and systems.

关键词： Molecules

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