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ProbView: a flexible probabilistic database system
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Supporting valid-time indeterminacy
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Probabilistic temporal databases, I: algebra
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Continuous queries over data streams
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The Theory of Probabilistic Databases
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WM'05 Proceedings of the Third Biennial conference on Professional Knowledge Management
Query processing using ontologies
CAiSE'05 Proceedings of the 17th international conference on Advanced Information Systems Engineering
Context- and situation-awareness in information logistics
EDBT'04 Proceedings of the 2004 international conference on Current Trends in Database Technology
A layered model for user context management with controlled aging and imperfection handling
MRC'05 Proceedings of the Second international conference on Modeling and Retrieval of Context
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ICCS '07 Proceedings of the 7th international conference on Computational Science, Part II
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Personal learning environments on the Social Semantic Web
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Robust and scalable user context management is the key enabler for the emerging context- and situation-aware applications, and ontology-based approaches have shown their usefulness for capturing especially context information on a high level of abstraction But so far the problem has not been approached as a data management problem, which is key to scalability and robustness The specific challenges lie in the imperfection of high-level context information, its time-dependence and the variability in the dynamics between its different elements The approach presented in this paper presents a layered data model which structures the problems and is geared towards flexible and efficient query processing in combination of relational database and logic-based techniques The techniques have been successfully applied for context-aware corporate learning support.