University of Athens (http://www.uoa.gr/)
Department of Informatics and Telecommunications (http://www.di.uoa.gr)
Prof. Yannis Ioannidis (Personal Homepage)
Research activities in the Laboratory for Advanced Information Systems of the University of Athens include three main areas: query processing and optimization over heterogeneous information sources, information search over distributed autonomous information providers, and personalized access to information sources. Information Search Over Distributed Autonomous Information Providers: Information search and query processing in the DL environment is very challenging and raises numerous problems with respect to topics such as algorithms, scale management, speculating on the individual system’s behavior, query optimization, etc. All these problems are investigated with the goal of developing a comprehensive approach to the overall issue. Personalized Access to Information Sources: Appropriate user models for representing user preferences over structured and unstructured data in profiles are investigated. Furthermore, methods for integrating such information into a user request in order to personalize its overall behavior and the final results are developed. In each case, user models that take advantage of specific characteristics of data depending on their type are explored. Query Processing/Optimization Over Heterogeneous Information Sources: Several aspects of traditional approaches to information access are compared and languages, algebras, and processing algorithms that support the necessary semantics across such diverse data sources are developed. |
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