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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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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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Detection of botnet collusion by degree distribution of domains

Detection of botnet collusion by degree distribution of doma...

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作者： Burghouwt, Pieter Spruit, Marcel Sips, Henk Research Group Information Security Hague University of Applied Sciences Netherlands Parallel and Distributed Group Department of Computer Science Delft University of Technology Netherlands

ISBN: (纸本)9781424488629

Malicious botnets threaten the Internet by DDoS-attacks, spam, information theft and other criminal activities. They are using increasingly sophisticated techniques to hide the Command and Control traffic. Many existing detection techniques can be defeated by encryption, tunneling in popular protocols, delays, and flow perturbation. We introduce a new DNS-based detection approach, that detects botnet collusion by anomalies in the degree distribution of visited domains, without any assumption about message content and statistical properties of the traffic. The proposed technique is difficult to evade, without major changes in the bot Command and Control Infrastructure or reduced utility. We evaluate evasion possibilities, derive a theoretical model of the detector performance and test the detector with a combination of captured Internet traffic and simulated botnet-traffic.

关键词： Botnet

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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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International Conference on Peer-to-Peer Computing

作者： R. Delaviz N. Andrade J. A. Pouwelse Parallel and Distributed Systems Group Department of Computer Science Delft University of Technnology Netherlands

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.

关键词： Peer to peer computing Accuracy Crawlers Protocols Testing Training Measurement

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A parameter-adaptive dynamic programming approach for inferring cophylogenies

A parameter-adaptive dynamic programming approach for inferr...

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8th Asia-Pacific Bioinformatics Conference, APBC 2010

作者： Merkle, Daniel Middendorf, Martin Wieseke, Nicolas Department of Mathematics and Computer Science University of Southern Denmark Odense Denmark Parallel Computing and Complex Systems Group Department of Computer Science University of Leipzig Germany

Background: Coevolutionary systems like hosts and their parasites are commonly used model systems for evolutionary studies. Inferring the coevolutionary history based on given phylogenies of both groups is often done by employing a set of possible types of events that happened during coevolution. Costs are assigned to the different types of events and a reconstruction of the common history with a minimal sum of event costs is sought. Results: This paper introduces a new algorithm and a corresponding tool called CoRe-PA, that can be used to infer the common history of coevolutionary systems. The proposed method utilizes an event-based concept for reconciliation analyses where the possible events are cospeciations, sortings, duplications, and (host) switches. All known event-based approaches so far assign costs to each type of cophylogenetic events in order to find a cost-minimal reconstruction. CoRe-PA uses a new parameter-adaptive approach, i.e., no costs have to be assigned to the coevolutionary events in advance. Several biological coevolutionary systems that have already been studied intensely in literature are used to show the performance of CoRe-PA. Conclusion: From a biological point of view reasonable cost values for event-based reconciliations can often be estimated only very roughly. CoRe-PA is very useful when it is difficult or impossible to assign exact cost values to different types of coevolutionary events in advance. © 2010 Yeturu et al;licensee BioMed Central Ltd.

关键词： Costs

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Performance and Scalability of GPU-Based Convolutional Neural Networks

Performance and Scalability of GPU-Based Convolutional Neura...

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Euromicro Conference on parallel, distributed and Network-Based Processing

作者： Daniel Strigl Klaus Kofler Stefan Podlipnig Distributed and Parallel Systems Group Institute of Computer Science University of Innsbruck Innsbruck Austria

In this paper we present the implementation of a framework for accelerating training and classification of arbitrary Convolutional Neural Networks (CNNs) on the GPU. CNNs are a derivative of standard Multilayer Perceptron (MLP) neural networks optimized for two-dimensional pattern recognition problems such as Optical Character Recognition (OCR) or face detection. We describe the basic parts of a CNN and demonstrate the performance and scalability improvement that can be achieved by shifting the computation-intensive tasks of a CNN to the GPU. Depending on the network topology training and classification on the GPU performs 2 to 24 times faster than on the CPU. Furthermore, the GPU version scales much better than the CPU implementation with respect to the network size.

关键词： Scalability Neural networks Cellular neural networks Optical character recognition software Acceleration Multilayer perceptrons Multi-layer neural network Pattern recognition Optical computing Optical fiber networks

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Grid resource management: On-demand provisioning, advance reservation, and capacity planning of grid resources

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作者： Siddiqui, Mumtaz Fahringer, Thomas Institute for Computer Science University of Innsbruck Technikerstraße 21a 6020 Innsbruck Austria Distributed and Parallel Systems Group Institute of Computer Science University of Innsbruck Technikerstraße 21a 6020 Innsbruck Austria

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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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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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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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distributed group communication system for mobile devices based on SMS

Distributed group communication system for mobile devices ba...

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作者： Kemme, Bettina Seeger, Christian McGill University School of Computer Science 3480 University Street Montreal QC Canada Technische Universität Darmstadt Department of Computer Science Databases and Distributed Systems Group Hochschulstraße 10 64289 Darmstadt Germany

ISBN: (纸本)3642172253

This paper presents a group communication system for mobile devices, called distributedGCS. Mobile communication is slow, expensive and suffers from occasional disconnections, especially when users are moving. distributedGCS is based on SMS and enables group communication despite these restrictions. It provides all primitives needed for a chat application and handles process failures. As mobile communication is expensive, distributedGCS is designed for small message overhead and, additionally, exploits SMS based message relaying to handle short-term disconnections. In this work, we present the group maintenance service and the multicast service of distributedGCS. In order to distribute the overhead of failure discovery over all processes we introduce the concept of a circle of responsibility for failure detection. We discuss informally that distributedGCS can handle the most common failures properly while keeping the message overhead very low. © 2010 Springer-Verlag Berlin Heidelberg.

关键词： Mobile telecommunication systems

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