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Design and Implementation of a Framework for Context-Aware Preference Queries
Patrick Roocks,Markus Endres,Alfons Huhn,Werner Kießling,Stefan Mandl 한국정보과학회 2012 Journal of Computing Science and Engineering Vol.6 No.4
In this paper we present a framework for a novel kind of context-aware preference query composition whereby queries for the Preference SQL system are created. We choose a commercial e-business platform for outdoor activities as a use case and develop a context model for this domain within our framework. The suggested model considers explicit user input, domain-specific knowledge, contextual knowledge and location-based sensor data in a comprehensive approach. Aside from the theoretical background of preferences, the optimization of preference queries and our novel generator based model we give special attention to the aspects of the implementation and the practical experiences. We provide a sketch of the implementation and summarize our user studies which have been done in a joint project with an industrial partner.
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An Agent based Method for Voltage Rise Mitigation in Distribution grids with high DG Penetration
Mariam Khattabi,Britta Buchholz,Andreas Kießling 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Following the widespread penetration of DG in distribution grids, electric power systems have been led up to a point where the operating conditions are becoming more and more stressed, namely regarding voltage profiles. In addition, reliability and security has become a primary concern for power system operation as it impacts strongly on the quality of supply. Therefore, development of control functionalities for DG units concerning voltage control has been a topic for investigation in recent years. In general, DG is not subject to a centralized dispatch, and reactive power generation is usually restricted by operation rules defined by the DSO. However, a significant growth of DG penetration requires a new operation philosophy to exploit reactive power generation capability of DG with the objective of optimizing grid operation by minimizing active power losses and maintaining voltage profiles. This implies that DG should be capable of adjusting their reactive power generation, i.e. be able to supply ancillary services of voltage and reactive power control. This paper presents an agent based approach demonstrating how beneficial the coordinated control of DG in combination with loads and storage can be for distribution system operation.
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