Fraunhofer Institut für Integrierte Publikations-und Informationssysteme IPSI

Fraunhofer Institut für Integrierte Publikations-und Informationssysteme IPSI

Now showing 1 - 10 of 10

Adaptive outsourcing in cross-organizational workflows

(GMD Forschungszentrum Informationstechnik, 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.
An admission control framework for applications with variable consumption rates in client-pull architectures

(GMD Forschungszentrum Informationstechnik, 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.
Transparent integration of continuous media support into a multimedia DBMS

(GMD Forschungszentrum Informationstechnik, 1997)
Hollfelder, S.
;
Schmidt, F.
;
Hemmje, M.
;
Aberer, K.
;
Steinmetz, A.
Efficient querying on genomic databases by using metric space indexing technology

(GMD Forschungszentrum Informationstechnik, 1997)
Chen, W.
;
Aberer, K.
A flexible approach to combine IR semantics and database technology and its application to structure document handling

(GMD Forschungszentrum Informationstechnik, 1995)
Volz, M.
;
Aberer, K.
;
Böhm, K.
Efficient algorithm for determining the optimal execution strategy for path queries in OODBS

(GMD Forschungszentrum Informationstechnik, 1995)
Chen, W.
;
Aberer, K.
;
Neuhold, E.J.
Flexible design and efficient implementation of a hypermedia document database system by tailoring semantic relationships

(GMD Forschungszentrum Informationstechnik, 1995)
Wäsch, J.
;
Aberer, K.
Efficient evaluation of declarative update queries

(GMD Forschungszentrum Informationstechnik, 1995)
Fischer, G.
;
Aberer, K.
HyperStorM

(GMD Forschungszentrum Informationstechnik, 1995)
Bapat, A.
;
Wäsch, J.
;
Aberer, K.
;
Haake, J.M.
Efficient multiple dispatching using nested transition-arrays

(GMD Forschungszentrum Informationstechnik, 1995)
Chen, W.
;
Aberer, K.

Fraunhofer Institut für Integrierte Publikations-und Informationssysteme IPSI

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