Fraunhofer Institut für Integrierte Publikations-und Informationssysteme IPSI

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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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Publication

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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Online Scheduling in Distributed Message Converter Systems

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

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Efficient processing of voluminous EDI documants

2000 , Risse, T. , Wombacher, A. , Aberer, K.

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Publication

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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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.

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A language for information commerce processes

2001 , Aberer, K. , Wombacher, A.

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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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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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Query Relaxation and Evaluation Optimization in Biological Databases

2000 , Chen, Y. , Che, D. , Aberer, K.

In this paper, a new technique is developed to support the query relaxation in biological databases. Query relaxation is required due to the fact that queries tend not to be expressed exactly by the users, especially in scientific databases like biological databases, in which complex domain knowledge is heavily involved. To treat this problem, we propose the concept of the so-called fuzzy equivalence classes to capture an important kind of domain knowledge that is used to relax queries. This concept is further integrated with the canonical techniques for pattern searching such as the position tree and automaton theory. As a result, fuzzy queries produced through relaxation can be efficiently evaluated. This method has been successfully utilized in a practical biological database - the GPCRDB.

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