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VALUETOOLS: 1st International Conference on Performance Evaluation Methodologies and Tools

作者： Schmitt, Jens B. Zdarsky, Frank A. Disco Distributed Computer Systems Lab. University of Kaiserslautern Germany

ISBN: (纸本)1595935045

In this paper we describe the design, implementation, and analytical background of the disco Network Calculator. The disco Network Calculator is an open-source toolbox written in Java#8482;which we developed for worst-case analyses based on network calculus. To our knowledge it is the first of its kind. It allows to do network analyses regarding performance characteristics such as delay and backlog bounds for piecewise linear arrival and service curves. We illustrate the tool's usefulness by two comprehensive example applications. Copyright 2006 ACM.

关键词： Telecommunication networks

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On the way to a distributed systems calculus: An end-to-end network calculus with data scaling

On the way to a distributed systems calculus: An end-to-end ...

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SIGMETRICS 2006/Performance 2006 - Joint International Conference on Measurement and Modeling of computer systems

作者： Fidler, Markus Schmitt, Jens B. Centre for Quantifiable Quality of Service NTNU Trondheim Norway Distributed Computer Systems Lab. University of Kaiserslautern Germany

ISBN: (纸本)1595933204

Network calculus is a min-plus system theory which facilitates the efficient derivation of performance bounds for networks of queues. It has successfully been applied to provide end-to-end quality of service guarantees for integrated and differentiated services networks. Yet, a true end-to-end analysis including the various components of end systems as well as taking into account mid-boxes like firewalls, proxies, or media gateways has not been accomplished so far. The particular challenge posed by such systems are transformation processes, like data processing, compression, encoding, and decoding, which may alter data arrivals drastically. The heterogeneity, which is reflected in the granularity of operation, for example multimedia applications process video frames which, however, are represented by packets in the network, complicates the analysis further. To this end this paper evolves a concise network calculus with scaling functions, which allow modelling a wide variety of transformation processes, Combined with the concept of packetizer this theory enables a true end-to-end analysis of distributed systems. Copyright 2006 ACM.

关键词： distributed computer systems

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Web services for the integration of XML-based content into learning platforms: A three-level model

Web services for the integration of XML-based content into l...

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2nd International Symposium on Leveraging Applications of Formal Methods, Verification and Validation, ISoLA 2006

作者： Kröger, Reinhold Lucke, Ulrike Schmid, Markus Tavangarian, Djamshid University of Applied Sciences Wiesbaden Distributed Systems Lab. Germany University of Rostock Institute of Computer Science Department for Computer Architecture Germany

ISBN: (纸本)0769530710

Along with the increasing diversity of educational markup languages there is a strong need for flexible integration of such content into learning platforms. Therefore, we have identified four basic mechanisms: plain linking from the platform to external content, conversion of content into the platforms native format, and service-based invocation of external content as well as specific functionality related to it. Architectural principles, benefits, and drawbacks of these concepts are compared, and exemplary realizations are described. © 2007 IEEE.

关键词： E-learning

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Economy-based data replication broker

Economy-based data replication broker

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e-Science 2006 - 2nd IEEE International Conference on e-Science and Grid Computing

作者： Lin, Henry Abawajy, J.H. Buyya, Rajkumar Grid Computing and Distributed Systems Lab. Dept. of Computer Science and Software Eng. University of Melbourne Melbourne VIC 3010 Australia Grid and Pervasive Computing Lab. School of Eng. and Information Technology Deakin University Geelong VIC 3072 Australia

ISBN: (纸本)0769527345

Data replication is one of the key components in data grid architecture as it enhances data access and reliability and minimises the cost of data transmission. In this paper, we address the problem of reducing the overheads of the replication mechanisms that drive the data management components of a data grid. We propose an approach that extends the resource broker with policies that factor in user quality of service as well as service costs when replicating and transferring data. A realistic model of the data grid was created to simulate and explore the performance of the proposed policy. The policy displayed an effective means of improving the performance of the grid network traffic and is indicated by the improvement of speed and cost of transfers by brokers. © 2006 IEEE.

关键词： Data reduction

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KidneyGrid: A grid platform for integration of distributed kidney models and resources

KidneyGrid: A grid platform for integration of distributed k...

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4th International Workshop on Middleware for Grid Computing (MGC'06) held at the ACM/IFIP/USENIX International Middleware Conference

作者： Chu, Xingchen Lonie, Andrew Harris, Peter Thomas, S. Randall Buyya, Rajkumar Grid Computing and Distributed Systems Lab. Dept. of Computer Science and Software Eng. University of Melbourne Australia Department of Information Systems University of Melbourne Australia Unit Faculty of Medicine Dentistry and Health Sciences University of Melbourne Australia FRE 2873 CNRS/Université d'Evry - Val d'Essonnes 91000 Evry France

ISBN: (纸本)1595935819

In this paper, we present a grid computing platform that provides experimental scientists and analysts with access to computational simulations and knowledge databases hosted in separate lab.ratories around the world involved with human and animal kidney research. No single lab.ratory can develop these resources in isolation and the community of users should no longer need to be dependent upon the specific programming environment in which applications have been developed. This is a major innovation in life science and exploits the power of existing and planned high-bandwidth communications networks for collab.rative research and for shared access to knowledge resources. The innovation is developed within a specialist community of renal scientists but will be transferable to any other field of research requiring interaction between published literature and databases, theoretical models and simulations and the formulation of effective experimental design. © 2006 ACM.

关键词： Grid computing

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distributed wisdom: Designing a replication service for large peer-to-peer data grids

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IEEE distributed systems Online 2006年第3期7卷 25-30页

作者： Srinivas, A. Vijay Reddy, M. Venkateswara Janakiram, D. Indian Institute of Technology Madras India Distributed and Object Systems Lab. Department of Computer Science and Engineering Indian Institute of Technology Madras India Department of Computer Science and Engineering Indian Institute of Technology Madras India

Some of the key issues in building services for large scale distributed systems, realizing Vishwa, a peer-to-peer (P2P) middleware architecture for developing grid applications are discussed. Researchers are producing large amounts of scientific data and believe that distributed computations on the data must be scheduled and availab.e to a large number of scientists. It is suggested that the platform must scale up to a large number of nodes and data units in the system and must also be scalab.e geographically. A scalab.e, reconfigurable shared-object space over the two-layer architecture can be developed that incorporates mechanisms to maintain replicated data and must also provide a shared-object abstraction over a wide-area distributed system.

关键词： distributed computer systems

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Spotlights on network operations and management research in Latin America - A report on LANOMS 2005

Spotlights on network operations and management research in ...

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作者： Granville, Lisandro Zambenedetti Gaspary, Luciano Paschoal Schulze, Bruno De Souza, José Neuman Brazil Special Interest Group on Computer Networks and Distributed Systems Brazilian Computer Society Brazil Brazilian Laboratory on Computer Networks Brazil IFIP/IEEE im Brazil Graduate Program on Applied Computing Universidade do Vale do Rio dos Sinos Brazil IEEE Communications Society Japan National Lab. for Scientific Computing - LNCC Brazil Brazilian National Research Council CNPq Brazil ACM Brazil IEEE Brazil Brazilian Computing Society Brazil Federal University of Ceará Brazil

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Geospatial ontology development and semantic analytics

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Transactions in GIS 2006年第4期10卷 551-575页

作者： Budak, I. Arpinar Sheth, Amit Ramakrishnan, Cartic Lynn U.E., Usery E. Azami, Molly Kwan, Mei-Po Large Scale Distributed Information Systems Lab. Computer Science Department University of Georgia Athens GA 30602-7404 United States Department of Geography University of Georgia Athens GA United States Department of Geography Ohio State University Columbus OH United States

Geospatial ontology development and semantic knowledge discovery addresses the need for modeling, analyzing and visualizing multimodal information, and is unique in offering integrated analytics that encompasses spatial, temporal and thematic dimensions of information and knowledge. The comprehensive ability to provide integrated analysis from multiple forms of information and use of explicit knowledge make this approach unique. This also involves specification of spatiotemporal thematic ontologies and populating such ontologies with high quality knowledge. Such ontologies form the basis for defining the meaning of important relations terms, such as near or surrounded by, and enable computation of spatiotemporal thematic proximity measures we define. SWETO (Semantic Web Technology Evaluation Ontology) and geospatial extension SWETO-GS are examples of these ontologies. The Geospatial Semantics Analytics (GSA) framework incorporates: (1) the ability to automatically and semi-automatically tract metadata from syntactically (including unstructured, semi-structured and structured data) and semantically heterogeneous and multimodal data from diverse sources;and (2) analytical processing that exploits these ontologies and associated knowledge bases, with integral support for what we term spatiotemporal thematic proximity (STTP) reasoning and interactive visualization capabilities. This paper discusses the results of our geospatial ontology development efforts as well as some new semantic analytics methods on this ontology such as STTP. © 2006 The Author. Journal compilation © 2006 Blackwell Publishing Ltd.

关键词： Ontology

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On lower bounds for MAC layer contention in CSMA/CA-based Wireless networks 05

On lower bounds for MAC layer contention in CSMA/CA-based Wi...

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2005 Joint Workshop on Foundations of Mobile Computing, DIALM-POMC 2005

作者： Zdarsky, Frank A. Martinovic, Ivan Schmitt, Jens B. Disco Distributed Computer Systems Lab University of Kaiserslautern Germany

ISBN: (纸本)1595930922

Wireless LANs operating within unlicensed frequency bands require random access schemes such as CSMA/CA, so that wireless networks from different administrative domains (for example wireless community networks) may co-exist without central coordination, even when they happen to operate on the same radio channel. Yet, it is evident that this lack of coordination leads to an inevitable loss in efficiency due to contention on the MAC layer. The interesting question is, which efficiency may be gained by adding coordination to existing, unrelated wireless networks, for example by self-organization. In this paper, we present a methodology based on a mathematical programming formulation to determine the parameters (assignment of stations to access points, signal strengths and channel assignment of both access points and stations) for a scenario of co-existing CSMA/CA-based wireless networks, such that the contention between these networks is minimized. We demonstrate how it is possible to solve this discrete, nonlinear optimization problem exactly for small problems. For larger scenarios, we present a genetic algorithm specifically tuned for finding near-optimal solutions, and compare its results to theoretical lower bounds. Overall, we provide a benchmark on the minimum contention problem for coordination mechanisms in CSMA/CA-based wireless networks. Copyright 2005 ACM.

关键词： Efficiency

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Best-effort versus reservations revisited

Best-effort versus reservations revisited

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13th International Workshop on Qualityof Service - IWQoS 2005

作者： Heckmann, Oliver Schmitt, Jens B. KOM Multimedia Communications Lab. TU Darmstadt Germany DISCO Distributed Computer Systems Lab. University of Kaiserslautern Germany

In this paper, we walk in the footsteps of the stimulating paper by Lee Breslau and Scott Shenker entitled "Best-effort vs. Reservations: A Simple Comparative Analysis"[1]. In fact, we finally follow their invitation to use their models as a starting point and extend them to reason about the very basic but still very much debated architectural issue whether quality of service (QoS) mechanisms like admission control and service differentiation are necessary or if overprovisioning with a single service class does the job just as well at lower system complexity. We analytically compare two QoS systems: a QoS system using admission control and a reservation mechanism that can guarantee bandwidth for flows respectively offers service differentiation based on priority queueing for two service classes and a system with no admission control and a single best-effort service class. © IFIP International Federation for Information Processing 2005.

关键词： Quality of service

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