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CEUR Workshop Proceedings 2017年 1826卷

作者： Kopp, Oliver Lenhard, Jörg Pautasso, Cesare University of Stuttgart Institute for Parallel and Distributed Systems Universitätsstraße 38 StuttgartDE70569 Germany Karlstad University Department of Mathematics and Computer Science Universitetsgatan 2 KarlstadSE65188 Sweden USI Faculty of Informatics Architecture Design and Web Information Systems Engineering Research Group Via Buffi 13 LuganoCH6900 Switzerland

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Streaming 4K/UHD video to the rest of us: Can bandwidth sharing help? 16

Streaming 4K/UHD video to the rest of us: Can bandwidth shar...

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16th IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks, WoWMoM 2015

作者： Montes, Isabel Chua, Jaymari Cruz, Michelangelo Remillano, Augusto Young, Joseph Darwin Ocampo, Roel Festin, Cedric Computer Networks Laboratory Electrical and Electronics Engineering Institute University of the Philippines Diliman Philippinese United States Networks and Distributed Systems Group Department of Computer Science University of the Philippines Diliman Philippinese United States

ISBN: (纸本)9781479984619

High quality video streaming for mobile users is difficult to achieve in some areas of the world due to poor broadband capacity and sparse network coverage. We propose a bandwidth-sharing scheme to allow users with limited uplink bandwidth to borrow idle bandwidth from nearby access points and provide these users the opportunity to experience higher quality video than what their own bandwidth could normally support. We developed a Linux kernel implementation of a multipath less-than-best-effort (MP-LBE) protocol for bandwidth scavenging and demonstrated, through testbed experiments, that video quality may be improved through bandwidth sharing. This may bring us closer to the 'video everywhere' vision even as incremental upgrades are made on broadband Internet infrastructure. © 2015 IEEE.

关键词： Video streaming

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Performance analysis of computational approaches to solve Multiple Sequence Alignment

Performance analysis of computational approaches to solve Mu...

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作者： Montañola, Alberto Roig, Concepció Guirado, Fernando Hernández, Porfidio Notredame, Cedric Distributed Computing Group Computer Science and Industrial Engineering Department Universitat de Lleida Lleida Spain Computer Architecture and Operating Systems Department Universitat Autònoma de Barcelona Cerdanyola del Vallès Spain Barcelona Spain

In the biotechnology field, the deployment of the Multiple Sequence Alignment (MSA) problem, which is a high performance computing demanding process, is one of the new challenges to address on the new parallel systems. The aim of this problem is to find similar regions on biological sequences. Furthermore, the goal of MSA applications is to align as much sequences as possible with a level of quality that makes the alignment biologically meaningful. An efficiency study of different MSA implementations, based on T-Coffee (one of the most used MSA aligners), has been performed in order to find new optimizations that may improve the average execution time on multi-core systems. We found that the current parallel implementations have some performance issues, affecting negatively the scalability of the process. Finally, the proposed implementation based on the usage of threads in conjunction with a message-passing library is presented, with the aim to optimize the execution of the MSA problem in multi-core-based clusters. © 2012 Springer science+Business Media, LLC.

关键词： Message passing

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Privacy as a Product: A Case Study in the m-Health Sector

Privacy as a Product: A Case Study in the m-Health Sector

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International Conference on Information, Intelligence, systems and Applications

作者： Constantinos Patsakis Agusti Solanas Distributed Systems Group School of Computer Science and Statistics Trinity College UNESCO Chair in Data Privacy Department Computer Engineering & Mathematics Universitat Rovira i Virgili

ISBN: (纸本)9781479907694

Business models based on offering free services to people in exchange for their data are gaining importance and prevalence. The most prominent examples are social networks and, more recently, mobile social networks. However, this trend is endangering users' privacy. We do not discuss the ethical and legal issues derived from this business model. Notwithstanding, we believe that users might have better and more privacy-aware alternatives enabling them to trade their privacy on their own. Thus, we introduce the concept of "Privacy as a Product" (PaaP) and we propose and describe a framework and a protocol based on the Raykova-Vo-Bellovin-Malkin protocol that enables users to share private data without the need for trusting the infrastructure (e.g. a social network).We show that our proposal is feasible in terms of computational and storage overhead. Hence, our solution opens the door to the new concept of "Privacy as a Product" and could be the foundation for implementations of privacy-aware social networks in which privacy plays a more central role, like in the healthcare sector.

关键词： Privacy Social Networks Secure Multiparty Computation M-Health

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Multi-agent multi-issue negotiations with incomplete information: A Genetic Algorithm based on discrete surrogate approach

Multi-agent multi-issue negotiations with incomplete informa...

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Congress on Evolutionary Computation

作者： Ahmed Kattan Yew-Soon Ong Edgar Galván-López AI Real-World Applications Lab Computer Science Department UQU Saudi Arabia School of Computer Engineering Nanyang Technological University Singapore Distributed Systems Group School of Computer Science and Statistics Trinity College Dublin Ireland

ISBN: (纸本)9781479904532

In this paper we present a negotiation agent based on Genetic Algorithm (GA) and Surrogate Modelling for a multi-player multi-issue negotiation model under incomplete information scenarios to solve a resource-allocation problem. We consider a multi-lateral negotiation protocol by which agents make offers sequentially in consecutive rounds until the deadline is reached. Agents' offers represent suggestions about how to divide the available resources among all agents participating in the negotiation. Each agent may “Accept” or “Reject” the offers made by its opponents through selecting the “Accept” or “Reject” option. The GA is used to explore the space of offers and surrogates used to model the behaviours of individual opponent agents for enhanced genetic evolution of offers that is agreeable upon all agents. The GA population comprises of solution individuals that are formulated as matrices where a specialised three different search operators that take the matrix representation into considerations are considered. Experimental studies of the proposed negotiation agent under different scenarios demonstrated that the negotiations by the agents completed in agreement before the deadline is reached, while at the same time, maximising profits.

关键词： Space exploration Mathematical model Approximation methods Genetic algorithms Computational modeling Equations Sociology

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Wide area distributed file systems-A scalability and performance survey

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Scalable Computing 2010年第3期11卷 305-326页

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

Recent decades have witnessed an explosive growth in the amounts of digital data in various fields of arts, science and engineering. Such data is generally of interest to a large number of people spread over wide geographical areas. Over the years, several distributed File systems (DFS) have, to varying degrees, addressed this requirement of sharing large amounts of data, stored in the form of files, among several users and applications. Scalability and performance are two important measures that determine the suitability of a file system for the applications executing over them. We perform a detailed comparative analysis of popular distributed file systems in terms of these measures in our survey. © 2010 SCPE.

关键词： Surveys

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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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A Taxonomy of Autonomic Application Management in Grids

A Taxonomy of Autonomic Application Management in Grids

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International Conference on Parallel and distributed systems (ICPADS)

作者： Mustafizur Rahman Rajiv Ranjan Rajkumar Buyya 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

关键词： Monitoring Resource management Taxonomy Processor scheduling Decision making Dynamic scheduling

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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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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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