Speaker: Professor Leopoldo Bertossi, Carleton University
Title: Contexts and Multidimensional Data Quality Assessment and Cleaning
Data quality and data cleaning are context dependent activities. Starting from this observation, in previous work a context model for the assessment of the quality of a database instance was proposed. In that framework, the context takes the form of a possibly virtual database or data integration system into which a database instance under quality assessment is mapped, for additional analysis and processing, enabling quality assessment. In this work we extend contexts with dimensions, and by doing so, we make possible a multidimensional assessment of data quality assessment. Multidimensional contexts are represented as ontologies written in DatalogA+/-. We use this language for representing dimensional constraints, and dimensional rules, and also for doing query answering based on dimensional navigation, which becomes an important auxiliary activity in the assessment of data.
Leopoldo Bertossi has been Full Professor at the School of Computer Science, Carleton University (Ottawa, Canada) since 2001. He is also a Faculty Fellow of the IBM Center for Advanced Studies (IBM Toronto Lab). Until 2001 he was professor and departmental chair (1993-1995) at the Department of Computer Science, PUC; and also the President of the Chilean Computer Science Society (SCCC) in 1996 and 1999-2000. He has been visiting professor at the computer science departments of the universities of Toronto (1989/90), Wisconsin-Milwaukee (1990/91), Marseille Luminy (1997) and visiting researcher at the Technical University Berlin (1997/98), visiting researcher and professor at the Free University of Bolzano-Bozen (Italy). In 2006 he was a visiting researcher at the Technical University of Vienna as a Pauli Fellow of the "Wolfgang Pauli Institu(WPI) Vienna". Prof. Bertossi's research interests include database theory, business intelligence, data quality, data integration, peer data management, semantic web, intelligent information systems, knowledge representation, logic programming, and computational logic. He obtained a PhD in Mathematics from the Pontifical Catholic University of Chile (PUC) in 1988. He did a PhD thesis on mathematical logic (model theory) under the supervision of Prof. Joerg Flum (University of Freiburg, Germany).