Fraunhofer Institut für Integrierte Publikations-und Informationssysteme IPSI

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Highly available DHTs

2006 , Knezevic, P. , Wombacher, A. , Risse, T.

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Advanced technologies for adaptive information managemnent systems

2005 , Risse, T.

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A location-aware prefetching mechanism

2004 , Kirchner, H. , Krummenacher, R. , Edwards-May, D. , Risse, T.

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Emergent semantics - Extended and revised version of the DASFAA 2004 paper

2004 , Aberer, K. , Catarci, T. , Cudre-Mauroux, P. , Dillon, T. , Grimm, S. , Hacid, M.-S. , Illarramendi, A. , Jarrar, M. , Kashyap, V. , Mecella, M. , Mena, E. , Neuhold, E.J. , Ouksel, A.M. , Risse, T. , Scannapieco, M. , Saltor, F. , Santis, L. de , Spaccapietra, S. , Staab, S. , Studer, R. , Troyer, O. de

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An overview on automatic capacity planning

2005 , Risse, T.

The performance requirement for the transformation of messages within electronic business processes is our motivation to investigate in automatic capacity planning methods. Performance typically means the throughput and response time of a system. Finding a configuration of a distributed system satisfying performance goals is a complex search problem that involves many design parameters, like hardware selection, job distribution and process configuration. Performance models are a powerful tool to analyse potential system configurations, however, their evaluation is expensive, such that only a limited number of possible configurations can be evaluated. In this paper we give an overview of our automatic system design method and discuss the arising problems to achieve the performance during the runtime of the systems. Furthermore we make a discussion on the impact of our strategy on the current trends in distributed systems.

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Supporting information access in next generation digital library architectures

2005 , Frommholz, I. , Knezevic, P. , Mehta, B. , Niederée, C. , Risse, T. , Thiel, U.

Current developments on Service-oriented Architectures, Peer-to-Peer and Grid computing promise more open and flexible architectures for digital libraries. They will open the Digital Library (DL) technology to a wider clientele, allow faster adaptability and enable the usage of federative models on content and service provision. These technologies raise new challenges for the realization of DL functionalities, which are rooted in the increased heterogeneity of content, services and metadata, in the higher degree of distribution and dynamics, as well as in the omission of a central control instance. This paper discusses these opportunities and challenges for three central types of DL functionality revolving around information access: metadata management, retrieval functionality, and personalization services.

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P2P evolution: From file-sharing to decentralized workflows

2004 , Risse, T. , Knezevic, P. , Wombacher, A.

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Understanding and tailoring your scientific information environment: A context-oriented view on e-science support

2005 , Niederée, C. , Stewart, A. , Muscogiuri, C. , Hemmje, M. , Risse, T.

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Emergent semantics

2004 , Aberer, K. , Cudre-Mauroux, P. , Ouksel, A.M. , Catarci, T. , Hacid, M.-S. , Illarramendi, A. , Kashyap, V. , Mecella, M. , Mena, E. , Neuhold, E.J. , Troyer, O. de , Risse, T. , Scannapieco, M. , Saltor, F. , Santis, L. de , Spaccapietra, S. , Staab, S. , Studer, R.

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Configuration of distributed message converter systems

2004 , Risse, T. , Aberer, K. , Wombacher, A. , Surridge, M. , Taylor, S.

Finding a configuration of a distributed system satisfying performance goals is a complex search problem that involves many design parameters, like hardware selection, job distribution and process configuration. Performance models are a powerful tool to analyze potential system configurations, however, their evaluation is expensive, such that only a limited number of possible configurations can be evaluated. In this paper we present a systematic method to find a satisfactory configuration with feasible effort, based on a two-step approach. First, performing a queuing network analysis a hardware configuration is determined and then a software configuration is incrementally optimized by simulating Layered Queuing Network models. We applied this method to the design of performant EDI converter systems in the financial domain, where increasing message volumes need to be handled due to the growing importance of B2B interaction.

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