Now showing 1 - 10 of 73
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Overview on decentralized establishment of consistent multi-lateral collaborations based on asynchronous communication

2005 , Wombacher, A. , Fankhauser, P. , Aberer, K.

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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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Online Scheduling in Distributed Message Converter Systems

2001 , Risse, T. , Wombacher, A. , Surridge, M. , Taylor, S. , Aberer, K.

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Stochastic Resource Prediction and Admission for Interactive Sessions on Multimedia Servers

2000 , Friedrich, M. , Hollfelder, S. , Aberer, K.

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Requirements for workflow modeling in P2P - workflows derived from collaboration establishment

2004 , Wombacher, A. , Aberer, K.

Web services advocate loosely coupled systems, although current applications are limited to centrally controlled structures. The reason for this limitation is the lack of a method for deciding collaboration consistency, that is deadlock freeness and boundedness, in a decentralized way. In particular, an intuitive approach classifies collaborations incorrectly being inconsistent due to the loss of information introduced by the decentralization. In this paper we identify loss of message ordering and message parameter value constraints caused by the decentralization to be the reasons for incorrect decision results. The proposed approach to overcome this issue is to explicate these constraints, which cannot represent in common workflow models.

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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 using performance modeling

2001 , Aberer, K. , Risse, T. , Wombacher, A.

To find 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. We present a systematic method to find a satisfactory configuration with feasible effort, based on a two-step approach. First, using performance estimates, a hardware configuration is determined and then the software configuration is incrementally optimized, evaluating Layered Queueing 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 increasing importance of B2B interaction.

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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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A language for information commerce processes

2001 , Aberer, K. , Wombacher, A.

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Modelling the ICE standard with a formal language for information commerce

2001 , Wombacher, A. , Aberer, K.

Automatizing information commerce requires languages to represent the typical information commerce processes. Existing languages and standards cover either only very specific types of business models or are too general to capture in a concise way the specific properties of information commerce processes. We introduce a language that is specifically designed for information commerce. It can be directly used for the implementation of the processes and communication required in information commerce. We demonstrate the use of the language by applying it to an important standard for specifying information commerce processes, the ICE Information and Content Exchange protocol [ICE1]. By doing so we also illustrate the benefit of using formal specifications for information commerce processes allowing to capture informal specifications, like ICE, in a concise way.