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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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Programming software agents as designing executable business processes: A Model-driven perspective 1

Programming software agents as designing executable business...

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First International Workshop ProMAS 2003: Programming Multi-Agent systems

作者： Müller, Jörg P. Bauer, Bernhard Friese, Thomas Siemens AG Corporate Technology Intelligent Autonomous Systems Otto-Hahn-Ring 6 D-81739 München Germany Programming of Distributed Systems Institute of Computer Science University of Augsburg D-86135 Augsburg Dept. of Mathematics and Computer Science University of Marburg D-35032 Marburg Germany

ISBN: (纸本)9783540221807

The contribution of this paper is fourfold. First, we sketch an architecture of agent-enabled business process management that cleanly separates between agent capabilities, business process modeling, and the modeling of services that are employed to actually implement processes. Second, we demonstrate how the Model-Driven Architecture (MDA) paradigm can be beneficially employed at all three layers of the agent-enabled business process architecture. Third, we describe an instance of a platform independent model based on the new UML2 standard, and sketch a mapping to a platform dependent model based on the Business Process Execution Language for Web Services (BPEL4WS). Fourth, we point out the relationship between the programming of multiagent systems, and the design of agent-enabled business processes. Our key thesis is that designing business processes based on an agent-enabled business processes modeling and enactment framework is a useful way of programming agents - a way that may help agent technology to gain much wider acceptance in industry. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Software agents

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Experience-based admission control (EBAC)

Experience-based admission control (EBAC)

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IEEE Symposium on computers and Communications (ISCC)

作者： M. Menth J. Milbrandt S. Oechsner Department of Distributed Systems Institute of Computer Science University of Würzburg Germany

Classical admission control approaches take either descriptor or measurement based information about the traffic into account without relating them to each other. We propose a experience-based AC (EBAC) which uses an empirical percentile of the effective reservation utilization to determine a suitable overbooking factor. In this paper, we show the impact of different measurement time scale resolutions and different quantiles on the performance of the system. We propose aging mechanisms for statistic collection to make the system adaptive to traffic mixes that change over time. We illustrate their effectiveness by simulation results.

关键词： Admission control Traffic control Bandwidth Telecommunication traffic Quality of service Robustness Next generation networking Safety computer science Time measurement

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Impact of routing and traffic distribution on the performance of network admission control

Impact of routing and traffic distribution on the performanc...

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IEEE Symposium on computers and Communications (ISCC)

作者： M. Menth J. Milbrandt S. Kopf Department of Distributed Systems Institute of Computer Science University of Würzburg Germany

In contrast to link admission control (LAC), which limits the truffle on a single link, network admission control (NAC) methods limit the traffic within a network. In this paper we present four basic budget based NAC approaches that have different complexity. They categorize most resource management schemes from a performance point of view regarding the maximum bandwidth utilization. Our results show that the option of single- or multi-path routing has a significant impact on the NAC performance while it is rather independent of the structure of the traffic matrix.

关键词： Routing Communication system traffic control Admission control Bandwidth Resource management Los Angeles Council Traffic control Telecommunication traffic computer science Intserv networks

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A performance evaluation framework for network admission control methods

A performance evaluation framework for network admission con...

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IEEE Symposium on Network Operations and Management

作者： M. Menth S. Kopf J. Milbrandt Department of Distributed Systems Institute of Computer Science University of Würzburg Germany

We introduce the notion of link and network admission control (LAC, NAC) and present three fundamentally different budget based NAC methods which categorize most of today's implemented NAC approaches. We propose a performance evaluation framework for their comparison. The required network capacity for each method is dimensioned for a certain flow blocking probability, and the average resource utilization is taken as performance measure. We point out several implementation options and investigate their impact. Based on numerical results, we give recommendations for preferred procedures. Finally, we compare different NAC methods under varying load conditions.

关键词： Admission control Resource management Los Angeles Council Capacity planning Fluid flow measurement Bandwidth Intserv networks Routing Economies of scale Communication system traffic control

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An analytic model for deriving the node-B transmit power in heterogeneous UMTS networks

An analytic model for deriving the node-B transmit power in ...

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IEEE Conference on Vehicular Technology (VTC)

作者： D. Staehle A. Mader Department of Distributed Systems Institute of Computer Science University of Würzburg Wurzburg Germany

UMTS operates with WCDMA over the air interface. Most studies dealing with the capacity of CDMA networks consider the uplink (reverse link) and evaluate the coverage or capacity of a cell or network. This focus on the uplink originates in the fact that the IS-95 network was a single voice network, such that the network performance was limited by the uplink. Furthermore, fast power control was then implemented on the uplink only. The introduction of 3G networks leaves the pure voice networks behind and instead provides a variety of different services which produce asymmetric traffic, with the bulk on the downlink (forward link). This traffic asymmetry shifts the capacity limit from the uplink to the downlink. The 3gpp standard prescribes the use of fast power control for the downlink as well. We propose a model to calculate the first and second moment of the node-B transmit power which allows us to approximate its distribution and to determine the probability that the system becomes unstable when a certain transmit power is exceeded.

关键词： Intelligent networks 3G mobile communication Downlink Multiaccess communication Power control Power system modeling Telecommunication traffic Traffic control Capacity planning Interference

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Performance analysis of content matching intrusion detection systems

Performance analysis of content matching intrusion detection...

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Symposium on Applications and the Internet (SAINT)

作者： S. Antonatos K.G. Anagnostakis E.P. Markatos M. Polychronakis Institute of Computer Science Foundation for Research and Technology Hellas Heraklion Greece Distributed Systems Laboratory CIS Department University of Pennsylvania Philadelphia PA USA

Although network intrusion detection systems (nIDS) are widely used, there is limited understanding of how these systems perform in different settings and how they should be evaluated. This paper examines how nIDS performance is affected by traffic characteristics, rulesets, string matching algorithms and processor architecture. The analysis presented in this paper shows that nIDS performance is very sensitive to these factors. Evaluating a nIDS therefore requires careful consideration of a fairly extensive set of scenarios. Our results also highlight potential dangers with the use of workloads based on combining widely-available packet header traces with synthetic packet content as well as with the use of synthetic rulesets.

关键词： Performance analysis Intrusion detection Costs Telecommunication traffic computer security Algorithm design and analysis Traffic control computer science Laboratories Computational Intelligence Society

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Generic Environment for Full Automation of Benchmarking 1

Generic Environment for Full Automation of Benchmarking

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Testing of Component-Based systems and Software Quality, 1st International Workshop on Software Quality, SOQUA 2004 and Workshop Testing Component-Based systems, TECOS 2004

作者： Kalibera, Tomáš Bulej, Lubomír Tůma, Petr Distributed Systems Research Group Department of Software Engineering Faculty of Mathematics and Physics Charles University Malostranské nám. 25 Prague118 00 Czech Republic Institute of Computer Science Czech Academy of Sciences Pod Vodárenskou věží 2 Prague182 07 Czech Republic

ISBN: (纸本)3885793873

Regression testing is an important part of software quality assurance. We work to extend regression testing to include regression benchmarking, which applies benchmarking to detect regressions in performance. Given the specific requirements of regression benchmarking, many contemporary benchmarks are not directly usable in regression benchmarking. To overcome this, we present a case for designing a generic benchmarking environment that will facilitate the use of contemporary benchmarks in regression benchmarking, analyze the requirements and propose architecture of such an environment. © 2004 Gesellschaft fur Informatik (GI). All rights reserved.

关键词： Benchmarking

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A model-driven approach to designing cross-enterprise business processes

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in computer science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2004年 3292卷 544-555页

作者： Bauer, Bernhard Müller, Jörg P. Roser, Stephan Programming of Distributed Systems Institute of Computer Science University of Augsburg D-86135 Augsburg Germany Siemens AG Corporate Technology Intelligent Autonomous Systems Otto-Hahn-Ring 6 D-81739 München Germany

Modeling and managing business processes that span multiple organizations involves new challenges, mainly regarding the ability to cope with change, decentralization, and the required support for interoperability. In this paper, we present an approach to modeling cross-enterprise business processes based on the model-driven architecture (MDA). Starting from the ATHENA interoperability architecture, we propose a conceptual architecture for cross-enterprise business processes. Then, we present a methodical approach towards designing cross-enterprise business processes based on a model-driven architecture. The core contribution of the paper is a set of original mappings at and across different layers of the model-driven architecture, including a mapping from ARIS to UML and the Business Process Definition Metamodel (BPDM). © Springer-Verlag 2004.

关键词： Mapping

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