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检索条件"机构=Programming of Distributed Systems Institute of Computer Science"

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An Economical Cost Model for Fair Resource Sharing in Virtual Home Environments

An Economical Cost Model for Fair Resource Sharing in Virtua...

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Conference on Next Generation Internet Networks, NGI

作者： Alberto E. Garcia Andreas Berl Karin A. Hummel Roman Weidlich Amine Houyou Klaus D. Hackbarth Herman De Meer Helmut Hlavacs Telematic Engineering Group University of Cantabria Spain Faculty of Computer Science and Mathematics University of Passau Germany Institute of Distributed and Multimedia Systems University of Technology Vienna Austria

Home networks recently gain importance due to their development from pure internal networks in form of an Ethernet LAN to converged networks integrating home, Internet, and access provider infrastructure. In emerging future home networking scenarios, service provisioning and network management is proposed by distributed architectures forming virtual home environments (VHEs). This paper provides a service description and corresponding traffic and cost model for fair resource sharing in VHEs. The objective of the proposed cost model is to allow an evaluation of the contribution and consumption for each user participating in the VHE to find an economic balance in the distributed behavior. Hereby, the contribution counts positively and the consumption negatively. The economic balance controls the load balancing in the VHE and further limits the consumption of resources for users which over-pass a corresponding threshold of negative balance leading to an exclusion from the VHE, if the negative balance is not equilibrated over a mean- or long-time horizon.

关键词： Environmental economics Costs Resource management Home automation Ethernet networks Local area networks IP networks Environmental management Telecommunication traffic Traffic control

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Advanced QoS methods for Grid workflows based on meta-negotiations and SLA-mappings

Advanced QoS methods for Grid workflows based on meta-negoti...

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Workshop on Workflows in Support of Large-Scale science, WORKS

作者： Ivona Brandic Dejan Music Schahram Dustdar Srikumar Venugopal Rajkumar Buyya Institute of Information Systems University of Technology Vienna Austria Grid Computing and Distributed System (GRIDS) Laboratory Department of Computer Science and Software Engineering University of Melbourne Australia

In novel market-oriented resource sharing models, resource consumers pay for the resource usage and expect that non-functional requirements for the application execution, termed as quality of service (QoS), are satisfied. QoS is negotiated between two parties following the specific negotiation protocols and is recorded using service level agreements (SLAs). However, most of the existing work assumes that the communication partners know about the SLA negotiation protocols and about the SLA templates before entering the negotiation. However, this is a contradictory assumption, if we consider computational grids and novel, commercially oriented computing clouds where consumers and providers meet each other dynamically. In this paper, we present novel meta-negotiation and SLA-mapping solutions for grid workflows bridging the gap between current QoS models and grid workflows, one of the most successful grid programming paradigms. We illustrate the open research issues with a real world case study. Thereafter, we present document models for the specification of meta-negotiations and SLA-mappings. We discuss the architecture for the management of meta-negotiations and SLA-mappings as well as integration of the architecture into a grid workflow management framework.

关键词： Quality of service Protocols Grid computing Cloud computing Resource management Information systems Laboratories computer science Software engineering Application software

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Performance Evaluation of IP over Cost-Optimized Optical Multilayer Networks with SRLGs

Performance Evaluation of IP over Cost-Optimized Optical Mul...

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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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Modeling semantic web services using UML 2

Modeling semantic web services using UML 2

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3rd International Workshop on Model-Driven Enterprise Information systems - MDEIS 2007;In Conjunction with ICEIS 2007

作者： Lautenbacher, Florian Bauer, Bemhard Programming Distributed Systems Lab. Institute of Computer Science University of Augsburg Germany

ISBN: (纸本)9789898111005

The development of web services and especially semantic web services is a tremendous task for people who are not familiar with all language constructs. Especially with the growing mass of several semantic web service approaches a language-independent service development is needed. This gap can be filled by using model-driven software development. Therefore, in this paper we introduce a meta-model for semantic web services and show the benefits of automatic code generation on the basis of a small example.

关键词： Web services

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From data privacy to location privacy: Models and algorithms 07

From data privacy to location privacy: Models and algorithms

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33rd International Conference on Very Large Data Bases, VLDB 2007

作者： Liu, Ling Distributed Data Intensive Systems Lab. School of Computer Science Georgia Institute of Technology United States

ISBN: (纸本)9781595936493

This tutorial presents the definition, the models and the techniques of location privacy from the data privacy perspective. By reviewing and revising the state of art research in data privacy area, the presenter describes the essential concepts, the alternative models, and the suite of techniques for providing location privacy in mobile and ubiquitous data management systems. The tutorial consists of two main components. First, we will introduce location privacy threats and give an overview of the state of art research in data privacy and analyze the applicability of the existing data privacy techniques to location privacy problems. Second, we will present the various location privacy models and techniques effective in either the privacy policy based framework or the location anonymization based framework. The discussion will address a number of important issues in both data privacy and location privacy research, including the location utility and location privacy trade-offs, the need for a careful combination of policy-based location privacy mechanisms and location anonymization based privacy schemes, as well as the set of safeguards for secure transmission, use and storage of location information, reducing the risks of unauthorized disclosure of location information. The tutorial is designed to be self-contained, and gives the essential background for anyone interested in learning about the concept and models of location privacy, and the principles and techniques for design and development of a secure and customizable architecture for privacy-preserving mobile data management in mobile and pervasive information systems. This tutorial is accessible to data management administrators, mobile location based service developers, and graduate students and researchers who are interested in data management in mobile information syhhhstems, pervasive computing, and data privacy. Copyright 2007 VLDB Endowment, ACM.

关键词： Data privacy

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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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A priori detection of link overload due to network failures

A priori detection of link overload due to network failures

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15. Fachtagung Kommunikation in Verteilten Systemen, KiVS 2007 - 15th Conference on Communication in distributed systems, KiVS 2007

作者： Milbrandt, Jens Menth, Michael Lehrieder, Frank Department of Distributed Systems Institute of Computer Science University of Würzburg Am Hubland D-97074 Würzburg Germany

ISBN: (纸本)3540699619

Restoration or protection switching mechanisms are triggered by link or node failures to redirect traffic over backup paths. These paths then carry the normal and the backup traffic which may lead to overload and thereby to quality of service (QoS) violations, i.e. to excessive packet loss and delay. In this paper, we present a method to assess the potential overload of the links due to network failures. We calculate the complementary cumulative distribution function (CCDF) of the relative load for each link in the network. We discuss various performance measures that condense this information to a single value per link which is suitable for a link ranking. This helps to identify weak spots of the network and to appropriately upgrade the bandwidth of links although they are not overloaded during normal operation. We implemented the concept in a software tool which helps network providers to anticipate the potential overload in their networks prior to failures and intended modifications (new infrastructure, new routing, new customers,) and to take appropriate actions.

关键词： Distribution functions

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Impact of Vertical Handovers on Cooperative Content Distribution systems

Impact of Vertical Handovers on Cooperative Content Distribu...

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International Conference on Peer-to-Peer Computing

作者： Michael Duelli Tobias Hossfeld Dirk Staehle Institute of Computer Science Department of Distributed Systems University of Würzburg Wurzburg Germany Department of Distributed Systems Institute of Computer Science W??rzburg Germany University of Wurzburg

In this paper, we evaluate the performance of a P2P- based content distribution system in heterogeneous, wireless networks. The mobile users coordinate each other with cooperation strategies enabled by the multi-source download mechanism, as in eDonkey or BitTorrent. Due to the mobility, vertical handovers between different wireless access technologies are required which may result in transmission delays and IP address changes of the switching peer. Hence, connections among users have to be reestablished and downloading users are requeued at a providing peer's waiting queue. In detail, we investigate the impact of requeueing with each VHO as well as the use of mechanisms that preserve the IP address and connections beyond VHOs, like MobilelP. Another important phenomenon occurring with VHOs is the abrupt change of the available bandwidth, e.g., from a fast WLAN connection to a rather slow UMTS connection. We evaluate the download times for files by means of simulation while considering different load scenarios in today's and future network layouts of the B3G network. As a result of the performance evaluation, we derive a new time-based cooperation strategy that counters the impact of mobility. Instead of downloading individual blocks of a file, a user gets a time slot at a providing peer. We show that this leads to a significant performance gain.

关键词： Peer to peer computing Wireless networks 3G mobile communication Bandwidth Wireless LAN Internet computer science Added delay Counting circuits Performance gain

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