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Conference on Next Generation Internet Networks, NGI

作者： M. Menth J. Milbrandt A. Reifert Department of Distributed Systems Institute of Computer Science University of Würzburg Germany Institut für Kommunikationsnetze und Rechnersysteme IKR University of Stuttgart Germany

In this work, we present several end-to-end protection switching mechanisms for application in multiprotocol label switching (MPLS). In case of local outages in the network, they deviate the traffic around the failed element over backup paths. They are easy to implement and reduce the additional capacity to maintain the quality of service (QoS) on the backup paths. We study the capacity savings of the presented methods for various protection schemes with different traffic matrices. We further test the influence of different resilience constraints such as the set of protected failure scenarios, bandwidth reuse restrictions due to optical communication, and traffic reduction due to failed border routers.

关键词： Resilience Protection switching Telecommunication traffic Multiprotocol label switching Routing Quality of service Bandwidth Load management Traffic control Optical fiber communication

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Automated detection of performance regressions: the mono experience

Automated detection of performance regressions: the mono exp...

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International Symposium on Modeling, Analysis and Simulation of computer and Telecommunication systems (MASCOTS)

作者： T. Kalibera L. Bulej P. Tuma Distributed Systems Research Group Department of Software Engineering Faculty of Mathematics and Physics Charles University Prague Czech Republic Institute of Computer Science Academy of Sciences of Czech Republic Czech Republic

Engineering a large software project involves tracking the impact of development and maintenance changes on the software performance. An approach for tracking the impact is regression benchmarking, which involves automated benchmarking and evaluation of performance at regular intervals. Regression benchmarking must tackle the nondeterminism inherent to contemporary computer systems and execution environments and the impact of the nondeterminism on the results. On the example of a fully automated regression benchmarking environment for the mono open-source project, we show how the problems associated with nondeterminism can be tackled using statistical methods.

关键词： MONOS devices Benchmark testing Software performance Software testing Software quality Quality assurance Automatic testing Robustness Performance analysis Software engineering

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DMC - distributed and Mobile Collaboration Workshop Report

DMC - Distributed and Mobile Collaboration Workshop Report

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IEEE International Workshop on Enabling Technologies: Infrastructure for Collaborative Enterprises (WET ICE)

作者： S. Dustdar H. Gall N. Mehandjiev S. Tata Distributed Systems Group University of Technology Vienna Austria Institut für Informatik Universität Zürich Switzerland School of Informatics University of Manchester Institute of Science and Technology UK Department of Computer Science GET/INT Evry France

The increased need for people and organizations to continue collaborating whilst changing physical location and crossing organizational boundaries has resulted in a wave of new supporting technologies, and generated interest in tackling some of the difficult research issues arsing in such a context. The latter was the subject of the Third IEEE International Workshop on distributed and Mobile Collaboration (DMC) at WETICE 2005, summirized here. The DMC Workshop included 10 full papers on topics grouped into four areas: Web-based collaboration, Formal description and consistency checking of collaborative processes, Models and architectures for collaborative services, and P2P collaborative infrastructures. The discussions at the workshop outlined several important issues regarding the field of distributed collaborative applications.

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University testbeds demonstrate major advances in autonomous rotorcraft control software

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Vertiflite 2005年第3期51卷 22-27页

作者： Bay, John S. Johnson, Eric N. Ray, Peter Information Exploitation Office DARPA Arlington VA United States Daniel Guggenheim School of Aerospace Engineering Georgia Institute of Technology Atlanta GA United States Embedded Systems Group Department of Electrical Engineering and Computer Science University of California Berkeley CA United States

In 2000, the Defense Advanced Research Projects Agency (DARPA) Software-Enabled Control (SEC) program started work on the advancement of control software design and implementation of autonomous vehicles. Using the fixed-wing and rotary-wing aircraft, the technologies were demonstrated on their autonomous helicopters test-bed in Georgia Tech and University of California (UC) at Berkeley. The same technology was implemented on different platforms, including micro air vehicles and full-size helicopters to achieve the autonomous behavior with a re-usable control software infrastructure.

关键词： Military helicopters

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Journal of Information science and Engineering: Editorial notice

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Journal of Information science and Engineering 2005年第5期21卷 i-ii页

作者： Lee, Der-Tsai Amato, Nancy M. Chang, Shih-Fu Chen, Homer H. Chen, Tsuhan Hsu, Tsan-Sheng Hwang, Jenq-Neng Kuo, Sy-Yen Kuo, Tei-Wei Li, Chung-Sheng Tokuyama, Takeshi Wing, Jeannette Wu, Tzong-Chen Yen, John Computer Science at Texas A and M University United States Parasol Laboratory United States IEEE Transactions on Parallel and Distributed Systems Computing Research Association's Committee on the Status of Women in Computing Research CRA-W's Distributed Mentor Program United States Department of Electrical Engineering Columbia University United States Lab. United States College of Electrical Engineering and Computer Science National Taiwan University Taiwan IEEE Transactions on Circuits and Systems for Video Technology IEEE Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA United States ACM ACM SIGACT IEEE Computer Society IICM Austria Research and Development of the Department Multimedia Signal Processing Technical Committee IEEE Signal Processing Society United States IEEE Transactions on Circuits and systems for Video Technology College of Electrical Engineering and Computer Science National Taiwan Ocean University Keelung Taiwan Department of Electrical Engineering National Taiwan University Taiwan Department of Computer Science and Information Engineering National Taiwan University Taipei Taiwan IEEE Technical Committee on Real-Time Systems Computer Science Division IBM T.J. Watson Research Center United States IBM Research Division Graduate School of Information Sciences Tohoku University Japan ACM IPSJ Mathematical Society of Japan Japan Department of Computer Science Computer Science Department Carnegie Mellon University United States National Academies of Science's Computer Science and Telecommunications Board United States Microsoft's Trustworthy Academic Advisory Board Intel Research Pittsburgh's Advisory Board United States Dartmouth's Institute for Security Technology Studies Advisory Committee Canada Sloan Research Fellowships Program Committee United States ACM Taiwan China Information Sciences and Technology Pennsylvania State University United States Laboratory for Intelligent Agents Penn State's School of Info

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Comparison of Load Balancing Algorithms for Structured Peer-to-Peer systems 34

Comparison of Load Balancing Algorithms for Structured Peer-...

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34. Jahrestagung der Gesellschaft fur Informatik, Informatik verbindet, INFORMATIK 2004 - 34th Annual Conference of the German Informatics Society, Informatics Connects, INFORMATIK 2004

作者： Rieche, Simon Petrak, Leo Wehrle, Klaus Protocol-Engineering and Distributed Systems Wilhelm-Schickard-Institute for Computer Science University of Tübingen Tübingen72076 Germany

ISBN: (纸本)3885793806

Among other things, Peer-to-Peer (P2P) systems are very useful for managing large amounts of widely distributed data. distributed Hash Tables (DHT) offer a highly scalable and self-organizing approach for efficient and persistent distribution and retrieval of data. However the scalability and performance of DHTs is strongly based on an equal distribution of data across participating nodes. Because this concept is based on hash functions, one assumes that the content is distributed nearly evenly across all DHT-nodes. Nonetheless, most DHTs show difficulties in load balancing as we will point out in this paper. To ensure the major advantages of DHTs – namely scalability, flexibility and resilience – we discuss three approaches of load balancing and compare them corresponding to simulation results. © 2004 Gesellschaft fur Informatik (GI). All rights reserved.

关键词： Hash functions

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PLAP - Pini-based Lightweight Agent Platform for industrial environments

PLAP - Pini-based Lightweight Agent Platform for industrial ...

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2nd IEEE International Conference on Industrial Informatics: Collaborative Automation - One Key for Intelligent Industrial Environments, INDIN'04

作者： Deter, Steffen Klostermeyer, Axel Peschke, Jörn Lüder, Arndt Department of Mathematics and Computer Science University of Marburg Germany Center Distributed Systems Institute of Ergonomics Manufacturing Systems and Automation Otto-von-Guericke University Magdeburg Germany

ISBN: (纸本)0780385136

Today's markets are characterized by increasing turbulence, which forces industrial companies world wide to become more and more flexible. This flexibility is needed in all levels of industry and especially within production. As the corresponding "enabling technologies" for information and communication in such production systems the internet with connections down to single field devices get into the focus of vendors and end using companies of automation systems |1, 2|. With regard to the steadily growing wish for flexibility software agents and plug&participate technologies are going to play an exceptional role. Unfortunately most of the existing agent-systems does not specifically follow the requirements of industrial automation. Due to the often restricted resources of (especially) field devices the need for agent platforms suitable for limited device environments in this context increases more and more. Here different approaches exist in order to meet the requirements and to satisfy the demand. On the one hand, there exist platforms which are based upon plug&participate technologies, but are not suitable for limited devices. On the other hand, there exist platforms for limited devices, which do not provide common plug&participate capabilities. Hence, there does not exist an agent platform satisfying all requirements at the same time. Therefore, this paper describes such a platform, which is based upon a Jini-like limited device plug&participate technology and thus is suitable also for industrial environments with often limited devices. © 2004 IEEE.

关键词： Intelligent agents

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Performance of TCP/IP with MEDF scheduling

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5th International Workshop on Quality of Future Internet Services, QofIS 2004 and 1st Workshop on Quality of Service Routing, WQoSR 2004 and 4th International Workshop on Internet Charging and QoS Technology, ICQT 2004

作者： Martin, Ruediger Menth, Michael Vu, Phan-Gia Department of Distributed Systems Institute of Computer Science University of Würzburg Am Hubland WürzburgD-97074 Germany

ISBN: (纸本)9783540232384

To achieve Quality of Service (QoS) in Next Generation Networks (NGNs), the Differentiated Services architecture implements appropriate Per Hop Behavior (PHB) for service differentiation. Common recommendations to enforce appropriate PHB include Weighted Round Robin (WRR), Deficit Round-Robin (DRR) and similar algorithms. They assign a fixed bandwidth share to Transport Service Classes (TSCs) of different priority. This is a viable approach if the ratio of high priority traffic TSChigh over low priority traffic TSClow is known in advance. If TSChigh holds more and TSClow less users than expected, the QoS for TSChigh can be worse than for TSClow. As shown in preceding work, the Modified Earliest Deadline First (MEDF) algorithm heals this problem on the packet level. Therefore, we investigate its impact in congested TCP/IP networks by simulations and show its attractiveness as a powerful service differentiation mechanism. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Quality of service

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Generating realistic workloads for network intrusion detection systems

Generating realistic workloads for network intrusion detecti...

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Proceedings of the Fourth International Workshop on Software and Performance, WOSP'04

作者： Antonatos, Spyros Anagnostakis, Kostas G. Markatos, Eyangelos P. Institute of Computer Science Found. for Research and Technology Hellas Greece Distributed Systems Lab. CIS Department Univ. of Pennsylvania United States

ISBN: (纸本)1581136730

While the use of network intrusion detection systems (nIDS) is becoming pervasive, evaluating nIDS performance has been found to be challenging. The goal of this study is to determine how to generate realistic workloads for nIDS performance evaluation. We develop a workload model that appears to provide reasonably accurate estimates compared to real workloads. The model attempts to emulate a traffic mix of different applications, reflecting characteristics of each application and the way these interact with the system. We have implemented this model as part of a traffic generator that can be extended and tuned to reflect the needs of different scenarios. We also present an approach to measuring the capacity of a nIDS that does not require the setup of a full network testbed. security, intrusion detection, workload characterization and generation.

关键词： computer networks

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Music2Share - Copyright-compliant music sharing in P2P systems

Music2Share - Copyright-compliant music sharing in P2P syste...

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作者： Kalker, Ton Epema, Dick H. J. Hartel, Pieter H. Lagendijk, R.L. Van Steen, Maarten Philips Research Eindhoven Eindhoven 5656 AA Netherlands Technical University Eindhoven Eindhoven 5612 AZ Netherlands Parallel and Distributed Systems Group Faculty of Electrical Engineering Mathematics and Computer Science Delft University of Technology Delft 2600 GA Netherlands Distributed and Embedded Systems Group Department of Computer Science University of Twente Enschede 7500 AE Netherlands Delft University of Technology Delft 2628 CD Netherlands Department of Computer Science Vrije Universiteit Amsterdam 1081 HV Netherlands

Peer-to-peer (P2P) networks are generally considered to be free havens for pirated content, in particular with respect to music. We describe a solution for the problem of copyright infringement in P2P networks for music sharing. In particular, we propose a P2P protocol that integrates the functions of identification, tracking, and sharing of music with those of licensing, monitoring, and payment. This highly decentralized music-aware P2P protocol will allow access to large amounts of music of guaranteed quality;it merges in a natural way the policing functions for copyright protection·and an efficient music-management infrastructure for the benefit of the user. © 2004 IEEE.

关键词： Copyrights

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