Français Anglais
Accueil Annuaire Plan du site
Accueil > Evenements > Séminaires
Séminaire d'équipe(s) BD
The skyline operator: recent research trends and applications
Matteo Magnani

19 February 2013, 14h30 - 19 February 2013, 16h00
Salle/Bat : 445/PCRI-N
Contact : jesus.camacho-rodriguez@lri.fr

Activités de recherche :

Résumé :
The skyline operator (aka Pareto front) extracts relevant records from multidimensional databases according to multiple criteria. This operator has received a lot of attention because of its ability to identify the best records in a database without requiring to specify complex parameters like the relative importance of each criterion (as it is done in ranking methods). However, recent attempts to apply the operator to real data analysis tasks have revealed some weaknesses of the original definition.

In this presentation I will introduce the skyline operator, indicate some recent research trends related to these weaknesses and focus on the so-called aggregate skyline queries, where the skyline is executed on sets of records instead of single items. This operator can be used to express queries in the form: return the best groups depending on the features of their elements, and thus provides a powerful combination of grouping and skyline functionality.

I will conclude the presentation by showing an application of the skyline operator to complex data representing multiple social networks.

Pour en savoir plus :
Séminaires
Knowledge Graph Refinement based on Triplet BERT-N
Gestion de données du Web
Monday 29 November 2021 - 13h00
Salle : 455 - PCRI-N
Armita Khajeh Nassiri .............................................

A Hyper-graph Approach for Computing EL+-Ontology
Raisonnement automatique
Monday 15 November 2021 - 13h00
Salle : 445 - PCRI-N
Hui Yang .............................................

Semantic approaches to predict the presence of asb
Intégration de données et de connaissances
Monday 08 November 2021 - 13h00
Salle : 455 - PCRI-N
Thamer Mecharnia .............................................

Pierre Andrieu - Agrégation de classements pour le
Thursday 21 October 2021 - 00h00
Salle : 435 - PCRI-N
.............................................

A counting argument for graph colouring
Théorie des graphes
Friday 08 October 2021 - 11h00
Salle : 445 - PCRI-N
Francois Pirot .............................................