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ITG-Fachtagung, Photonische Netze

作者： Michael Duelli Matthias Hartmann Michael Menth Ralf Hulsermann Michael Duser University of Wuerzburg Institute of Computer Science Department of Distributed Systems T-Systems Enterprise Services GmbH

ISBN: (纸本)9783800730971

The design of optical transport and IP networks is investigated with respect to the effect on overall network performance when the two aspects are combined in the same network architecture. The focus is on the identification of advantages in the joint design of IP and transport networks, as well as on the shortcomings and network bottlenecks which may result from sub-optimal design. The impact of different IP routing strategies (shortest path, equal-cost multipath) on the network utilization is quantified, and potential sources for overload in the IP domain are determined. Simulations were carried out to systematically assess technical metrics like link utilization and economic parameters such as cost for a 50-node transport network with line rates up to 40 Gbit/s. The impact of fiber cuts was taken into account, leading to multiple logical IP links to fail simultaneously, i.e. shared risk link groups (SRLGs), and triggering massive IP rerouting. Applying the results allows to identify bottlenecks in the design, and to devise mechanisms which allow cost-optimal network design of future IP and optical transport networks.

关键词： Wavelength division multiplexing IP networks Multiprotocol label switching Integrated optics Transponders Synchronous digital hierarchy

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Checking Session-Oriented Interactions between Web Services

Checking Session-Oriented Interactions between Web Services

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Euromicro Conference on Software Engineering and Advanced Applications (SEAA)

作者： Pavel Parizek Jiri Adamek Faculty of Mathematics and Physics Department of Software Engineering Distributed Systems Research Group Charles University Prague Czech Republic Institute of Computer Science Academy of Sciences슠of the슠Czech Republic Czech Republic

Although Web services are generally envisioned as being stateless, some of them are implicitly stateful. The reason is that the Web services often work as front-ends to enterprise systems and are used in a session-oriented way by the clients. Contrary to the case of stateless services, for a stateful Web service there exist constraints to the order in which the operations of the service may be invoked. However, specification of such constraints is not a standard part of a Web service interface, and compliance with such constraints is not checked by the standard Web service development tools. Therefore, we propose in this paper to extend a web service interface by a constraint definition that is based on behavior protocols. Also, we implemented a tool that checks whether a given BPEL code complies with the constraints of all stateful web services it communicates with. The key idea behind the tool is to translate the BPEL code into Java and then to check the Java program using Java PathFinder with behavior protocol extension.

关键词： Web services Java Software engineering Simple object access protocol Standards development XML Application software Mathematics Physics computer science

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A Qualitative Measurement Survey of Popular Internet-based IPTV systems

A Qualitative Measurement Survey of Popular Internet-based I...

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Second International Conference on Communications and Electronics

作者： Tobias Hossfeld Kenji Leibnitz Institute of Computer Science Department of Distributed Systems University of Würzburg Germany Graduate School of Information Science and Technology Osaka University Japan

Television over the Internet (IPTV) is regarded as the killer application for Next Generation Networks (NGN). While the ITU is currently moving toward the standardized of IPTV, several existing applications like Joost and Zattoo are currently already providing a large amount of video content to Internet users. In this paper we study some popular video content delivery mechanisms and characterize them by measurements to study the user-perceived Quality of Experience (QoE).

关键词： IPTV Web server Satellite broadcasting Network servers TV broadcasting Internet telephony IP networks Next generation networking Digital video broadcasting Web and internet services

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Cooperating CoScheduling:A Coscheduling Proposal Aimed at Non-Dedicated Heterogeneous NOWs

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Journal of computer science & Technology 2007年第5期22卷 695-710页

作者： Francesc Giné Francesc Solsona Mauricio Hanzich Porfidio Hernández Emilio Luque Department of Computer Science Universitat de Lleida Spain Department of Computer Architecture & Operating Systems Universitat Autònoma de Barcelona Spain

Implicit coscheduling techniques applied to non-dedicated homogeneous Networks Of Workstations （NOWs） have shown they can perform well when many local users compete with a single parallel job. Implicit coscheduling deals with minimizing the communication waiting time of parallel processes by identifying the processes in need of coscheduling through gathering and analyzing implicit runtime information, basically communication events. Unfortunately, implicit coscheduling techniques do not guarantee the performance of local and parallel jobs, when the number of parallel jobs competing against each other is increased. Thus, a low efficiency use of the idle computational resources is achieved. In order to solve these problems, a new technique, named Cooperating CoScheduling （CCS）, is presented in this work. Unlike traditional implicit coscheduling techniques, under CCS, each node takes its scheduling decisions from the occurrence of local events, basically communication, memory, Input/Output and CPU, together with foreign events received from cooperating nodes. This allows CCS to provide a social contract based on reserving a percentage of CPU and memory resources to ensure the progress of parallel jobs without disturbing the local users, while coscheduling of communicating tasks is ensured. Besides, the CCS algorithm uses status information from the cooperating nodes to balance the resources across the cluster when necessary. Experimental results in a non-dedicated heterogeneous NOW reveal that CCS allows the idle resources to be exploited efficiently, thus obtaining a satisfactory speedup and provoking an overhead that is imperceptible to the local user.

关键词： job scheduling non-dedicated and heterogeneous NOW computing resource allocation

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Research issues in multiple policy optimization using collaborative reinforcement learning

Research issues in multiple policy optimization using collab...

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ICSE 2007 Workshops: International Workshop on Software Engineering for Adaptive and Self-Managing systems, SEAMS'07

作者： Dusparic, Ivana Cahill, Vinny Distributed Systems Group Department of Computer Science Trinity College Dublin

ISBN: (纸本)0769529739

Self-organizing techniques have successfully been used to optimize software systems, such as optimization of route stability in ad hoc network routing and optimization of the use of storage space or processing power using load balancing. Existing self-organizing techniques typically focus on a single, usually implicitly specified, system goal and tune systems parameters towards optimally meeting that goal. In this paper, we consider optimization of large-scale multi-agent ubiquitous computing environments, such as urban traffic control. Applications in this class are typically required to optimize towards multiple goals simultaneously. Additionally, these multiple goals can potentially be conflicting, change over time, and apply to various parts of the system such as a single agent, a group of agents, or the system as a whole. In contrast to existing self-organizing systems in which agents are homogeneous to the extent that they are working towards a common goal, agents in these systems are heterogeneous in that they may have differing goals. Thus, existing self-organizing optimization techniques must be extended to deal with multiple goal optimization and the resulting heterogeneity of agents. In this paper we present a research agenda for extending Collaborative Reinforcement Learning (CRL), an existing self-organizing optimization technique, to support multiple policy optimization. © 2007 IEEE.

关键词： Software engineering

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Integrating the visualisation reference model with ecological interface design 07

Integrating the visualisation reference model with ecologica...

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25th Anniversary Conference of the European Association for Cognitive Ergonomics, EACE

作者： Upton, Connor Doherty, Gavin Distributed Systems Group Department of Computer Science Trinity College Dublin Ireland

ISBN: (纸本)9781847998491

Motivation - In some situations EID's high-level visual design principles can be difficult to apply. A more concrete design methodology would make the framework more accessible for interface designers. Research approach - Graphics research was reviewed across a number of fields. The Visualisation Reference Model was identified as a useful model that could be used alongside EID's visual design principles. A case study is used to demonstrate this approach. Findings/Design - Supplementing a work domain analysis with a task analysis can reveal how information requirements are used. This allows data transformations and visual mapping to be carried out to generate visual components in an ecological interface design. Take away message - Task analysis not only improves the quality of our information requirements, it can also inform the visual design process.

关键词： Visualization

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Social network analysis for routing in disconnected delay-tolerant MANETs 07

Social network analysis for routing in disconnected delay-to...

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MobiHoc'07: 8th ACM International Symposium on Mobile Ad Hoc Networking and Computing

作者： Daly, Elizabeth M. Haahr, Mads Distributed Systems Group Computer Science Department Trinity College Dublin Dublin Ireland

ISBN: (纸本)9781595936844

Message delivery in sparse Mobile Ad hoc Networks (MANETs) is difficult due to the fact that the network graph is rarely (if ever) connected. A key challenge is to find a route that can provide good delivery performance and low end-to-end delay in a disconnected network graph where nodes may move freely. This paper presents a multidisciplinary solution based on the consideration of the so-called small world dynamics which have been proposed for economy and social studies and have recently revealed to be a successful approach to be exploited for characterising information propagation in wireless networks. To this purpose, some bridge nodes are identified based on their centrality characteristics, i.e., on their capability to broker information exchange among otherwise disconnected nodes. Due to the complexity of the centrality metrics in populated networks the concept of ego networks is exploited where nodes are not required to exchange information about the entire network topology, but only locally available information is considered. Then SimBet Routing is proposed which exploits the exchange of pre-estimated "betweenness' centrality metrics and locally determined social "similarity' to the destination node. We present simulations using real trace data to demonstrate that SimBet Routing results in delivery performance close to Epidemic Routing but with significantly reduced overhead. Additionally, we show that SimBet Routing outperforms PRoPHET Routing, particularly when the sending and receiving nodes have low connectivity. Copyright 2007 ACM.

关键词： Ad hoc networks

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Light-weight erid-to-end QoS as DoS prevention

Light-weight erid-to-end QoS as DoS prevention

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32nd IEEE Conference on Local computer Networks, LCN 2007

作者： Waldvogel, Marcel Köck, Tobias Distributed Systems Laboratory Department of Computer and Information Science University of Konstanz 78457 Konstanz Germany

ISBN: (纸本)0769530001

This paper proposes a first step into a common solution, where combined and extended interests will hopefully allow us to surpass this threshold. While there are still some open issues, we hope to not only propose a basic working mechanism but also provide fresh ideas to start thinking off the beaten path. Our main contribution is to create a lightweight, end-to-end binding between path and service, which is then used as a basis to associate further attributes and mechanisms to this binding. © 2007 IEEE.

关键词： Quality of service

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Vs golf - Developing location-based multi-player games

Vs golf - Developing location-based multi-player games

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31st Annual International computer Software and Applications Conference, COMPSAC 2007

作者： Treu, Georg Martens, Johannes Schicker, Matthias Breisinger, Marc Küpper, Axel Mobile and Distributed Systems Group Department of Computer Science Ludwig-Maximilians Universität München Germany

ISBN: (纸本)9780769528700

Location-based multi-player games are currently being pushed by the industry, one main factor being that highly-accurate positioning technologies like GPS as well as broadband mobile networks like UMTS are finally getting widespread. Nevertheless, generic frameworks for efficiently managing user locations are still missing, which strongly complicates game development. This paper presents TraX, a device-centric framework for Locationbased Services, which especially supports proactive and multi-player services and thus perfectly matches the challenges mobile game development faces today. The suitability of TraX is evaluated by means of VsGolf, an actual location-based multi-player game, which has been developed and tested by students in only four days. © 2007 IEEE.

关键词： computer graphics

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e-petri net model for programming integrated network of wireless sensor networks and grids

e-petri net model for programming integrated network of wire...

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CIT 2007: 7th IEEE International Conference on computer and Information Technology

作者： Adimallikarjuna Reddy, V. Kumar, A. V. U. Phani Janakiram, D. Distributed and Object Systems Lab. Department of Computer Science and Engineering Indian Institute of Technology Madras Chennai 600036 India

ISBN: (纸本)0769529836

Applications like weather forecasting and prediction, health-care monitoring, habitat monitoring, tsunami-warning systems, demand integration of Wireless Sensor Networks (WSNs) with grids. The issues that need to be addressed are, providing suitable programming platform, seamless networking, data management, service/resource discovery etc. Objective of this work is to provide a programming model for this integrated network. We propose a programming model built using e-Petri Net, an extension to the classical Petri Net. We define the meta model for the e-Petri Net using Generic Modeling Environment (GME) tool. This meta-model gives the flexibility in understanding and analysing the application before hand. © 2007 IEEE.

关键词： Wireless sensor networks

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