Archive for February, 2009

Diego Calvanese is visiting Webdam

February 23rd, 2009
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Diego Calvanese is visiting Webdam from Monday 23 February to Friday 27 February 2009. He is a professor at the Faculty of Computer Science at the Free University of Bozen-Bolzano.
He will present his work on Ontology-Based Data Access and Data Integration Wednesday at 2:00pm in the meeting room N107.

Title : Ontology-Based Data Access and Data Integration

Summary :Ontologies provide a conceptualization of a domain of interest. Nowadays, they are typically represented in terms of Description Logics, and are seen as the key technology used to describe the semantics of information at various sites. The idea of using ontologies as a conceptual view over data repositories is becoming more and more popular. In order for this idea to become widespread in standard applications, it is fundamental that the conceptual layer through which the underlying data layer is accessed does not introduce a significant overhead in dealing with the data. Based on these observations, in recent years techniques to access data sources through a conceptual layer built on top of them have been developed, and the computational complexity of answering queries over ontologies, measured in the size of the underlying data, has been studied. In the talk we will present the general ideas underlying ontology based data access and integration, and will discuss the tradeoff between expressive power of the ontology language, and efficiency in query processing. Specifically, we will address the possibility of delegating query processing in ontology based data access to a relational database engine and will also present the QuOnto system, implementing this approach.

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08/28/2009 : Following-VLDB workshop

February 13th, 2009
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When : Friday August 28th (just after VLDB)

Who : Webdam members and Webdam advisory board

Where : Telecom ParisTech, Paris [46, rue Barrault - 75013 Paris]

Agenda :

  • Brainstorming session with all the members
  • Private first meeting of the advisory board

Summary :

  • What do we expect from foundations of Web data management?
  • What are the goals?
  • What should be the content?
  • What can be achieved in Webdam?

Full program : see Workshop program
Notes on the meeting

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06/17-19/2009 : Joint-ERC workshop

February 13th, 2009
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This event has been cancelled.

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Bolzano visiting Webdam

February 13th, 2009
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Werner Nutt and Diego Calvanese from Free U. of Bozen-Bolzano will both come for short visits.


New members

February 13th, 2009
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After the first round of intensive recruitment all around the world, we are happy to announce and welcome the future new members of the project.

  • Balder ten Cate from U. of Amsterdam will join us in April for 6 months and possibly more
  • Yannis Katsis from UCSD will join us after his thesis around September for hopefully a long time.
  • We are quite confident that Marie-Christine Rousset from U Grenoble and Philippe Rigaux from U. Paris Dauphine will join us for a long time.

Moreover, Evgeny Kharlamov, PhD student at the Free U. of Bozen-Bolzano is already visiting for 6 months: he is working with Serge A. and Pierre S. on aggregate functions for probabilistic databases. This is a joint work with Werner Nutt from the same university.

Of course, we are still looking for great researcher to join our project and we hope that is just a start!