Steffen Lamparter

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A key challenge for dynamic Web service selection is that Web services are typically highly configurable and service requesters often have dynamic preferences on service configurations. Current approaches, such as WS-Agreement, describe Web services by enumerating the various possible service configurations, an inefficient approach when dealing with(More)
Semantically rich descriptions of web services enable automatic composition and matchmaking. End users as well as providers compose web services according to their needs. Since in general, there can be more than one possibilities (combinations of web services) to achieve a certain goal, a user has to decide which of the alternatives suits him the best. This(More)
Large software systems are modularized in order to improve manageability. The parts of the software system communicate in order to achieve the desired functionality. To better understand, develop, manage, and maintain the resulting complexity, this paper presents a framework of ontologies. The ontologies range from very general, foundational ones to(More)
Peripartum cardiomyopathy (PPCM) is a rare disorder of dilated cardiomyopathy and left ventricular dysfunction occurring in the last month of pregnancy or within 5 months postpartum. Outcome of PPCM is highly variable, comprising clinical improvement and rapid deterioration unresponsive to medical treatment requiring heart transplantation or even death. In(More)
We present a description and analysis of the data access challenge in the Siemens Energy. We advocate for Ontology Based Data Access (OBDA) as a suitable Semantic Web driven technology to address the challenge. We derive requirements for applying OBDA in Siemens, review existing OBDA systems and discuss their limitations with respect to the Siemens(More)
In recent years, electronic markets have gained much attention as institutions to allocate goods and services efficiently between buyers and sellers. However, calculating suitable allocations between buyers and sellers in such markets can easily become very tricky, particularly if the services and goods involved are complex and described by multiple(More)
Different Web service standards, WS*, factorize Web service management tasks into different aspects, such as input/output, workflow, or security. WS* descriptions are exchangeable and developers may use different implementations for the same Web service description. Researchers investigating semantic Web services have clearly articulated these shortcomings(More)
Service-oriented computing provides the right means for building flexible systems that allow dynamic configuration and on-the-fly composition. In order to realize this vision, the system must be able to choose the most suitable service from a large and constantly changing number of providers. We present an approach for selecting services based on a coherent(More)