19 Octobre - 25 Octobre

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Lundi 19 Octobre
Heure: 14:00 - 15:00
Lieu: Salle B107, bâtiment B, Université de Villetaneuse
Résumé: An uncertainty approach (probabilistic + possibilistic) for analyzing users' attitudes (emotions & opinions (feelings & judgments)) from their literature
Description: Sayyed Ali Hossayni In this seminar, we adopt an uncertainty approach to attitude prediction. Uncertainty approach includes probabilistic and possibilistic approaches and attitude includes opinion and emotion. The seminar has two parts: probabilistic & possibilistic attitude mining. In the probabilistic part, we first propose a new approach to attitude mining and prove its efficiency by applying it on collaborative filtering. Our approach, unlike the existing ones in state of the art, does not represent the users’ attitudes as numbers, but as a probability/possibility distribution function (PDF) (mathematically speaking, not a whole graph but its few (normally 1 or 2) parameter(s)). Then, we suggest upgrading Sentilo (the existing opinion mining platform in state of the art) to become able to provide more knowledge about attitude of the users’ (or attitude of whom they wrote about) about the entities/topics. In the second part of the seminar, we explain a different type of uncertainty (possibility) and also its better impact (under some circumstances) on data mining. Then, we will propose application of a new possibilistic tools that we customize it for text mining for being utilizable in attitude prediction. It is notable that the second part of the presentation can also be useful for general data mining purposes.
Mardi 20 Octobre
Heure: 14:00 - 17:00
Lieu: Salle B107, bâtiment B, Université de Villetaneuse
Résumé: Forme limite de tableaux de Young rectangulaires
Description: Philippe Marchal En 2004, Pittel et Romik ont montré l'existence d'une forme limitepour les tableaux de Young rectangulaires.Je montrerai comment la méthode probabiliste des "densités", que je développe depuis quelques travaux déjà, permet de retrouver cette forme limite et donne aussi les fluctuations sur lebord : on trouve une gaussienne dans les coins et Tracy-Widom ailleurs sur le bord.