Hal-Diderot
Not a member yet
3207753 research outputs found
Sort by
Science Ouverte
No full textOuverture des publicationsGestion des données de la rechercheLe pilier logicielÉvolution nécessaire de l’évaluation de la rechercheDoctora
Generalized min-up/min-down polytopes
No full textConsider a time horizon and a set of possible states for a given system. The system must be in exactly one state at a time. In this paper, we generalize classical results on min-up/min-down constraints for a 2-state system to an n-state system. The minimum-time constraints enforce that if the system switches to state i at time t, then it must remain in state i for a minimum number of time steps. The minimum-time polytope is defined as the convex hull of integer solutions satisfying the minimum-time constraints. A variant of minimum-time constraints is also considered, namely the no-spike constraints. They enforce that if state i is switched on at time t, the system must remain on states j ≥ i during a minimum time. Symmetrically, they enforce that if state i is switched off at time t, the system must remain on states j < i during a minimum time. The no-spike polytope is defined as the convex hull of integer solutions satisfying the no-spike constraints. For both the minimum-time polytope and the no-spike polytope, we introduce families of valid inequalities. We prove that these inequalities lead to a complete description of linear size for each polytope
Shape sensitivity analysis of an elastic contact problem: convergence of the Nitsche based finite element approximation
No full textIn a recent work, we introduced a finite element approximation for the shape optimization of an elastic structure in sliding contact with a rigid foundation where the contact condition (Signorini's condition) is approximated by Nitsche's method and the shape gradient is obtained via the adjoint state method. The motivation of this work is to propose an a priori convergence analysis of the numerical approximation of the variables of the shape gradient (displacement and adjoint state) and to show some numerical results in agreement with the theoretical ones. The main difficulty comes from the non-differentiability of the contact condition in the classical sense which requires the notion of conical differentiability
Homogeneous non-split superstrings of odd dimension 4
No full textInternational audienceLet be the holomorphic line bundle of degree on the projective line. Here, the tuples for which there does not exists homogeneous non-split supermanifolds associated with the vector bundle are classified. \\For many types of the remaining tuples, there are listed cocycles that determine homogeneous non-split supermanifolds. \\Proofs follow the lines indicated in the paper Bunegina V.A., Onishchik A.L., Homogeneous supermanifolds associated with the complex projective line.neous supermanifolds associated with the complex projective line. J. Math. Sci. V. 82 (1996)3503--3527
Du rire aux apprentissages. L'humour à l'université : retours réflexifs sur la formation des professeurs des écoles
No full textInternational audienc
L’entrée dans l’analyse d’un texte littéraire : un enrôlement en 600 secondes ?
No full textInternational audienc
The Aquatic Ape (new version)
No full textInternational audienceHow can a high-level French swimmer premeditate his disqualification in the semi-finals of the Paris Games 2024? And why does this exclusion from the sport shed light on Paleon-tology - the science of fossils? On the shores of the Red Sea, Dave unearths fragments of a 7 million-year-old hominoid skeleton. His stubbornness in defending the hypothesis of the aquatic ape - ancestor of Man- will in turn disqualify him from scientific research, lead him to risk his life at a depth of over 100 meters in the North Sea, take him to Russia to the source of the forbidden experiment on water babies, before returning to Paris to steal a skull from the Museum of Evolution. An unexpected piece of evidence will suddenly turn his life upside down and reveal one of the greatest discoveries on the origins of humanity. This novel, that follows the Epic of a incorrigible outsider, is based on real facts.Any resemblance to existing or passed people is purely coincidental
À la rentrée 2022, la taille des classes continue de diminuer dans le premier degré
No full textChaque note d’information présente les résultats les plus récents issus des exploitations d’enquêtes et d’études statistiques. Cette publication apporte l’éclairage de la direction de l’évaluation, de la prospective et de la performance (DEPP) à la compréhension et à l’analyse du système éducatif français. Elle est disponible en ligne, sous la forme de fichiers imprimables à télécharger, accompagnés de tableaux de données chiffrées et de graphiques.À la rentrée 2022, la taille des classes du premier degré continue de diminuer dans les écoles publiques, que ce soit dans les classes de niveau préélémentaire ou élémentaire.Cette tendance est particulièrement marquée depuis 2017, suite à la mise en oeuvre des dédoublements de classes en éducation prioritaire.Ces mesures, qui ont d’abord concerné les classes de CP-CE1, et depuis la rentrée 2020 les grandes sections de maternelle, n’ont pas retiré de moyens aux autres niveaux.Elles n’ont pas non plus été réalisées aux dépens des écoles rurales ou urbaines hors éducation prioritaire, dont le nombre d’élèves par classe diminue également.Par ailleurs, le plafonnement à 24 du nombre d’élèves par classe en grande section, CP et CE1 sur l’ensemble du territoire, amorcé en 2020, contribue aussi à alléger la taille des classes
Influencer is the New Recommender: insights for Theorising Social Recommender Systems
No full textInternational audienceDesigning theory-driven social recommender systems (SRSs) has been a significant research challenge for over a decade. This study aims to identify behavioural factors that could improve the persuasiveness and quality of recommendations made by SRSs. Given both research streams' striking similarity, it uses the recent yet rich research on social media influencers (SMI) to inform SRS research. Drawing on 72 publications, we classified 52 independent variables into 12 categories regrouped into three broad categories that characterise the relationships between the consumer and the (i) recommender system, (ii) product or brand, and (iii) and advert. The metanalysis results determined the relative importance of each category in predicting purchase intentions, placing recommender credibility and attitude towards the recommended product or brand at the top of the charts. Our findings are expected to facilitate more refined theory-building efforts and theory-driven designs in SRS research and practice
