To celebrate his scientific career and achievements, a scientific and festive event will be organized in Serge Abiteboul’s honor on the occasion of ICDT 2024 in Paestum, Italy, the 27th edition of a conference that Serge helped create in 1986, first held in Rome. The event will be held on…
October 4th, 2023, 10:00, Salles des Actes, ENS, 45 rue d’Ulm, Paris. Ontology-Based Query Answering: Expressivity and Extensions Jury: Carsten Lutz, PR., Leipzig Universität (Reviewer)Marie-Christine Rousset, Prof., Université de Grenoble (Reviewer)Balder ten Cate, Ass. PR., University of Amsterdam (Reviewer)Diego Figueira, CR, CNRS/Univ. Bordeaux (Member)Luc Segoufin, DR, Inria/ENS/PSL (Member)Sophie Tison, PR,…
25 September 2023, 10:30-11:30. ENS, room S16. Complexity Study of Reasoning about Knowledge and Public Observations Abstract: This talk explores the model checking and satisfiability problems in logical systems for reasoning about knowledge and observations of intelligent agents and their interactions. We examine the foundations laid by Kripke and Hintikka,…
18 July 2023, 10:30-11:30. ENS, room Emmy Noether, on level -2 of Aile Rataud. Distinct Elements in Streams: An Algorithm for the (Text) Book Abstract: Given a data stream of m elements, the Distinct Elements problem is to estimate the number of distinct elements in the stream. Distinct Elements has…
Postponed. ENS, S16. On Approximating Total Variation Distance Abstract: Total variation distance (TV distance) is a fundamental notion of distance between probability distributions. we introduce and study the problem of computing the TV distance between two product distributions over the domain {0,1}^n. In particular, we establish the following results. The…
26 May 2023, 10:30-11:30. ENS, S16. Normalisations of Existential Rules: Not so Innocuous! Existential rules are an expressive knowledge representation language mainly developed to query data. In the literature, they are often supposed to be in some normal form that simplifies technical developments. For instance, a common assumption is that…
12 December 2022, 14:00-15:30. ENS, Hauts du DI. Intégration de données textuelles pour la détection des risques naturels en agriculture Agriculture is entering the digital age through data (which opens up precision agriculture) or knowledge (which opens up new decision support tools). Modern technologies and IoT devices have been applied…
28 November 2022, 14:00-15:00. ENS, S16. Detection of Anomalies and Identification of their Precursors in Large Data Series Collections Extensive collections of data series are becoming a reality in many scientific and social domains, such as environmental sciences, astrophysics, neurosciences, and engineering. Informally, a data series is an ordered sequence…
4 November 2022, 10:30-11:30. ENS, S16. Datalog: Optimizations and Extensions Modern data analytics requires iteration, yet relational database engines are mostly optimized for non-recursive queries. SQL supports only a limited form of recursion. A better formalism for recursive queries is datalog, which has some elegant properties (recursion always terminates), and…
3 June 2022, 10:30-11:30. ENS, Hauts du DI. Querying inconsistent prioritized data with ORBITS: Algorithms, implementation, and experiments We investigate practical algorithms for inconsistency-tolerant query answering over prioritized knowledge bases, which consist of a logical theory, a set of facts, and a priority relation between conflicting facts. We consider three…
