Now showing 1 - 10 of 10
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Adaptive outsourcing in cross-organizational workflows

1998 , Klingemann, J. , Wäsch, J. , Aberer, K.

Competitive markets force companies to minimize their costs while at the same time offering solutions which are tailored to the needs of their customers. This requires organizations to outsource at least parts of the overall effort and to rely on services which have to be provided by external partners, leading ultimately to virtual enterprises. The workflow concept has been very successful in coordinating and streamlining business processes but is so far limited to a single organization. Any attempt to distribute workflows among different organizations has to face the problems posed by the complex relationship among autonomous organizations and their services. To address these problems we propose a serviceoriented model for cross-organizational workflows. Modeling the workflow execution as a cooperation of services allows different organizations to interact via well-defined interfaces. We further show how the execution can be optimized by selecting services depending on their contribution to quality criteria of the workflow.

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Efficient querying on genomic databases by using metric space indexing technology

1997 , Chen, W. , Aberer, K.

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Efficient evaluation of declarative update queries

1995 , Fischer, G. , Aberer, K.

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Efficient multiple dispatching using nested transition-arrays

1995 , Chen, W. , Aberer, K.

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An admission control framework for applications with variable consumption rates in client-pull architectures

1998 , Hollfelder, S. , Aberer, K.

Highly interactive multimedia applications require variable data rates during their presentation. Current admission control mechanisms do not address the variable data rate requirements appropriately for the following reasons: (1) classical admission control mechanisms are based on the server-push approach, where the required data rate has to be estimated in advance, and (2) worst-case resource reservation is not economic. Client-pull models are more appropriate to serve these kinds of applications. At the current state, there are no suitable mechanisms that support admission control in client-pull architectures at the server. In this paper, a session-oriented framework for admission control is introduced that is based on two steps: (1) the admission of new clients and (2) the scheduling of the single requests of admitted clients to balance the load. The goal of this approach is to improve the server utilization and the Quality of Service. Evaluation studies demonstrate the benefit of the framework.

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Efficient algorithm for determining the optimal execution strategy for path queries in OODBS

1995 , Chen, W. , Aberer, K. , Neuhold, E.J.

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A flexible approach to combine IR semantics and database technology and its application to structure document handling

1995 , Volz, M. , Aberer, K. , Böhm, K.

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Transparent integration of continuous media support into a multimedia DBMS

1997 , Hollfelder, S. , Schmidt, F. , Hemmje, M. , Aberer, K. , Steinmetz, A.

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Flexible design and efficient implementation of a hypermedia document database system by tailoring semantic relationships

1995 , Wäsch, J. , Aberer, K.

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HyperStorM

1995 , Bapat, A. , Wäsch, J. , Aberer, K. , Haake, J.M.