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检索条件"机构=Department of Computer Science Communication and Distributed Systems"

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A P2P-based framework for distributed Network Management

A P2P-based framework for Distributed Network Management

引用

2nd International Workshop of the EURO-NGI Network of Excellence

作者： Binzenhöfer, Andreas Tutschku, Kurt Auf Dem Graben, Björn Fiedler, Markus Arlos, Patrik Department of Distributed Systems Institute of Computer Science University of Würzburg Am Hubland 97074 Würzburg Germany Dept. of Telecommunication Systems School of Engineering Blekinge Institute of Technology 371 79 Karlskrona Sweden

ISBN: (纸本)3540340254

In this paper we present a novel framework supporting distributed network management using a self-organizing peer-to-peer over-lay network. The overlay consists of several distributed Network Agents which can perform distributed tests and distributed monitoring for fault and performance management. In that way, the concept is able to over-come disadvantages that come along with a central management unit, like lack of scalability and reliability. So far, little attention has been payed to the quality of service experienced by the end user. Our self-organizing management overlay provides a reliable and scalable basis for distributed tests that incorporate the end user. The use of a distributed, self-organizing software will also reduce capital and operational expenditures of the operator since fewer entities have to be installed and operated. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Telecommunication networks

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Motor adptation to dynamic environments in arm reaching motions

Motor adptation to dynamic environments in arm reaching moti...

引用

18th IMEKO World Congress 2006: Metrology for a Sustainable Development

作者： Ito, Koji Imai, Tsutomu Kondo, Toshiyuki Department of Computational Intelligence and Systems Science Tokyo Institute of Technology Yokohama Japan Department of Computer Information and Communication Sciences Tokyo University of Agriculture and Technology Tokyo Japan

ISBN: (纸本)9781622766468

In daily life, humans must compensate for the resultant forces arising form interaction with the physical environment. Recent studies have shown that humans can acquire a neural representation of the relation between motor command and movement, i.e. learn an internal model of the environment dynamics. The present paper discusses whether humans can identify one side of dynamics from the mixed environment dynamics in the case where humans have experienced either of them.

关键词： Dynamic environment Force field Internal model Motor adaptation Reaching motion

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Displacement Whiplash PCR: Optimized architecture and experimental validation 1

引用

12th International Meeting on DNA Computing

作者： Rose, John A. Komiya, Ken Yaegashi, Satsuki Hagiya, Masami Institute of Information Communication Technology Ritsumeikan Asia Pacific University Department of Computer Science and UPBSB The University of Tokyo Japan Science and Technology Agency-CREST Dept. of Computational Intelligence and Systems Science Tokyo Institute of Technology

ISBN: (数字)9783540684237

ISBN: (纸本)9783540490241

Whiplash PCR-based methods of biomolecular computation (BMC), while highly-versatile in principle, are well-known to suffer from a simple but serious form of self-poisoning known as back-hybridization. In this work, an optimally re-engineered WPCR-based architecture, Displacement Whiplash PCR (DWPCR) is proposed and experimentally validated. DWPCR's new rule protect biostep, which is based on the primer-targeted strand-displacement of back-hybridized hairpins, renders the most recently implemented rule-block of each strand unavailable, abolishing back-hybridization after each round of extension. In addition to attaining a near-ideal efficiency, DWPCR's ability to support isothermal operation at physiological temperatures eliminates the need for thermal cycling, and opens the door for potential biological applications. DWPCR should also be capable of supporting programmable exon shuffling, allowing XWPCR, a proposed method for programmable protein evolution, to more closely imitate natural evolving systems. DWPCR is expected to realize a highly-efficient, versatile platform for routine and efficient massively parallel BMC.

关键词： Biology

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Vishwa: A reconfigurable P2P middleware for Grid Computations

Vishwa: A reconfigurable P2P middleware for Grid Computation...

引用

International Conference on Parallel Processing (ICPP)

作者： M. Venkateswara Reddy A. Vijay Srinivas Tarun Gopinath D. Janakiram Department of Computer Science & Engineering Distributed and Object Systems Laboratory Chennai India

The abundant computing resources available on the Internet has made grid computing over the Internet a viable solution, to scientific problems. The dynamic nature of the Internet necessitates dynamic reconfigurability of applications to handle failures and varying loads. Most of the existing grid solutions handle reconfigurability to a limited extent. These systems lack appropriate support to handle the failure of key-components, like coordinators, essential for the computational model. We propose a two layered peer-to-peer middleware, Vishwa, to handle reconfiguration of the application in the face of failure and system load. The two-layers, task management layer and reconfiguration layer, are used in conjunction by the applications to adapt and mask node failures. We show that our system is able to handle the failures of the key-components of a computation model. This is demonstrated in the case studies of two computational models, namely bag of tasks and connected problems, with an appropriate example for each

关键词： Middleware Grid computing Peer to peer computing Internet Computational modeling computer networks IP networks Scalability Routing computer architecture

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Performance modelieg of a bottleneck node in an IEEE 802.11 ad-hoc network

引用

5th International Conference on Ad-Hoc, Mobile, and Wireless Networks, ADHOC-NOW 2006

作者： Van Den Berg, Hans Mandjes, Michel Roijers, Frank TNO Information and Communication Technology Netherlands Department of Design and Analysis of Communication Systems University of Twente Netherlands Centre for Mathematics and Computer Science Netherlands Korteweg-de Vries Institute University of Amsterdam Netherlands

ISBN: (纸本)3540372466

The IEEE 802.11 MAC-protocol, often used in ad-hoc networks, has the tendency to share the capacity equally amongst the active nodes, irrespective of their loads. An inherent drawback of this fair-sharing policy is that a node that serves as a relay-node for multiple flows is likely to become a bottleneck. This paper proposes a flow-level performance model of such a bottleneck node using fluid-flow analysis. Assuming Poisson initiations of new flow transfers at the bottleneck node, we obtain insightful, robust, and explicit expressions for characteristics related to the overall flow transfer time, the buffer occupancy, and the packet delay at the bottleneck node. The analysis is enabled by a translation of the behavior of the bottleneck node and the source nodes in terms of an M/G/1 queueing model. We conclude the paper by an assessment of the impact of alternative capacity sharing amongst source nodes and the bottleneck in order to improve the performance of the bottleneck. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Telecommunication networks

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On the use of DVB-H for satellite multimedia networks

On the use of DVB-H for satellite multimedia networks

引用

2006 IEEE 17th International Symposium on Personal, Indoor and Mobile Radio communications, PIMRC

作者： Cioni, S. Corazza, G.E. Neri, M. Vanelli-Coralli, A. Advanced Research Center on Electronic Systems for Information and Communication Technologies Department of Electronics Computer Science and Systems University of Bologna Via V. Toffano 2/2 40125 Bologna Italy

ISBN: (纸本)1424403294

In all short-medium term business/market forecasts, the efficient provision of digital multimedia broadcasting (DMB) services in mobile systems appears to be of key importance for mobile operators and broadcasters. Several DMB systems are being developed around the world, with several proposed competing standards. In this framework, the DVB (Digital Video Broadcasting) forum is working to define a new air interface, identified as DVB-SSP, to deliver satellite services to portable devices, and several possibilities are being considered as viable options, including the use of DVB-H (Handheld). A critical factor to be considered is the resilience to non linear distortion effects. In fact, DVB-H signals are obtained through an OFDM modulation, which traditionally was considered unfit for satellite communications. Recently [3], it has been proved that the adoption of strong channel coding techniques in conjunction with the use of non-linear distortion compensation techniques can lead to good OFDM performance even when operating close to amplifier saturation. Following this avenue, this paper investigates the adaptation of the DVB-H physical layer to the satellite environment, and validates the improved robustness of the proposed scheme to non linear distortion. © 2006 IEEE.

关键词： Orthogonal frequency division multiplexing

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Capacity Requirements for the One-to-One Backup Option in MPLS Fast Reroute

Capacity Requirements for the One-to-One Backup Option in MP...

引用

International Conference on Broadband Networks (BroadNets)

作者： Ruediger Martin Michael Menth Korhan Canbolat Department of Distributed Systems Institute of Computer Science University of Würzburg Germany

MPLS fast reroute (MPLS-FRR) mechanisms deviate the traffic in case of network failures at the router closest to the outage location to achieve an extremely fast reaction time. We review the one-to-one backup and the facility backup that are options for MPLS-FRR to deviate the traffic via a detour or a bypass around the failed elements, respectively. Basically, the backup paths can take the shortest path that avoids the outage location from the point of local repair to the tail-end router or to the merge point with the primary path. We suggest two simple modifications that lead to a new path layout which can be implemented by one-to-one and by facility backup. We evaluate the backup capacity requirements, the length of the backup paths, and the number of backup paths per primary path in a parametric study regarding the network characteristics. Our proposals save a considerable amount of backup capacity compared to the standard mechanisms. They are suitable for application in practice since they are simple and conform to the standards.

关键词： Multiprotocol label switching Telecommunication traffic Resilience Protocols computer science Parametric study Proposals Capacity planning Protection switching

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Accuracy and Dynamics of Hash-Based Load Balancing Algorithms for Multipath Internet Routing

Accuracy and Dynamics of Hash-Based Load Balancing Algorithm...

引用

International Conference on Broadband Networks (BroadNets)

作者： Ruediger Martin Michael Menth Michael Hemmkeppler Department of Distributed Systems Institute of Computer Science University of Wuerzburg Wurzburg Germany

This paper studies load balancing for multipath Internet routing. We focus on hash-based load balancing algorithms that work on the flow level to avoid packet reordering which is detrimental for the throughput of transport layer protocols like TCP. We propose a classification of hash-based load balancing algorithms, review existing ones and suggest new ones. Dynamic algorithms can actively react to load imbalances which causes route changes for some flows and thereby again packet reordering. Therefore, we investigate the load balancing accuracy and flow reassignment rate of load balancing algorithms. Our exhaustive simulation experiments show that these performance measures depend significantly on the traffic properties and on the algorithms themselves. As a consequence, our results should be taken into account for the application of load balancing in practice.

关键词： Load management Internet Routing Heuristic algorithms Throughput Transport protocols Telecommunication traffic Traffic control IP networks TCPIP

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Real-time coordination of autonomous vehicles

Real-time coordination of autonomous vehicles

引用

International Conference on Intelligent Transportation

作者： M. Bouroche B. Hughes V. Cahill Distributed Systems Group Computer Science Department Trinity College Dublin Ireland

Autonomous vehicles seem to be a promising approach to both reducing traffic congestion and improving road safety. However, for such vehicles to coexist safely, they need to coordinate their behaviour to ensure that they do not collide with each other. This coordination is typically based on (wireless) communication between vehicles and needs to satisfy stringent real-time constraints. However, realtime message delivery cannot be guaranteed in dynamic wireless networks which means that existing coordination models that rely on continuous connectivity cannot be employed. In this paper, we present a novel coordination model for autonomous vehicles that does not require continuous real-time connectivity between participants in order to ensure that system safety constraints are not violated. This coordination model builds on a real-time communication model for wireless networks that provides feedback to entities about the state of communication. The coordination model uses this feedback to ensure that vehicles always satisfy safety constraints, by adapting their behaviour when communication is degraded. We show that this model can be used to coordinate vehicles crossing an unsignalised junction

关键词： Remotely operated vehicles Mobile robots Vehicle safety Wireless networks Road vehicles Road safety Wireless communication Vehicle dynamics Real time systems State feedback

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Capacity requirements for the facility backup option in MPLS fast reroute

Capacity requirements for the facility backup option in MPLS...

引用

IEEE Workshop on High Performance Switching and Routing

作者： R. Martin M. Menth K. Canbolat Department of Distributed Systems Institute of Computer Science University of Würzburg Germany

MPLS fast reroute (MPLS-FRR) mechanisms deviate the traffic in case of network failures at the router which is closest to the outage location to achieve an extremely fast reaction time. We review the facility backup that is an option for MPLS-FRR that deviates the traffic via a bypass around the failed elements. Basically, the backup path can take the shortest path that avoids the outage location from the point of local repair to the merge point with the primary path. We suggest two new simple modifications that lead to a new path layout which can be implemented by the facility backup. We evaluate the backup capacity requirements, the length of the backup paths, and the number of backup paths in a parametric study regarding the network characteristics. Our proposals save a considerable amount of backup capacity compared to the standard mechanisms. They are suitable for application in practice since they are simple and conform to the standards

关键词： Multiprotocol label switching Telecommunication traffic Resilience Protection Protocols Intelligent networks computer science Parametric study Proposals Capacity planning

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