Canal-U

 

Résultats de recherche

Nombre de programmes trouvés : 196
Label UNT Conférences

le (48m54s)

Introduction to Kernelization

Preprocessing or data reductions means reducing the input to something simpler by solving an easy part of the input and this is the type of algorithms used in almost every application. In spite of wide practical applications of preprocessing, a systematic theoretical study of such algorithms remains elusive. The framework of parameterized complexity can be used as an approach to analyse preprocessing algorithms. Input to parameterized algorithms include a parameter (in addition to the input) which is likely to be small, and this resulted in a study of preprocessing algorithms that reduce the size of the input to a ...
Voir la vidéo
Label UNT Conférences

le (1h7m16s)

Réseaux d'automates: trente ans de recherche

Ma complicité avec ce sujet date de longtemps, pas tout à fait assez pour dire que j’y étais depuis le début, mais quand même.... Ainsi, je vais vous raconter comment on a obtenu, aux alentours de l'année 1979, les premiers résultats mathématiques sur la dynamique de ce qui s’appelle aujourd'hui les réseaux de neurones artificiels et qui font aujourd’hui partie du cursus classique de toute école d’ingénieurs. Puis, le succès de ces résultats m’a amené, à partir d’une étrange lettre que j’ai reçue au début de vacances à Grenoble, à me passionner pour les fourmis. Je suis quand même ...
Voir la vidéo
Label UNT Conférences

le (53m2s)

Mathematical models for the cardiovascular system

Mathematical models for the cardiovascular system: analysis, numerical simulation, applications The role of mathematics in understanding and simulating fluid dynamics and biochemical processes in the physiological and pathological functioning of the human cardiovascular system is becoming more and more crucial. These phenomena are indeed correlated with the origin of some major cardiovascular pathologies, and influence the efficacy of the treatments to heal the arteries from their diseases. Mathematical models allow the description of the complex fluid-structure interaction which govern the artery wall deformation under the pressure pulse. Moreover, appropriate reduction strategies can be devised to allow for an ...
Voir la vidéo
Label UNT Conférences

le (1h3m13s)

Graphes, hypergraphes et réseaux (série : Colloquium Jacques Morgenstern)

Le but de la conférence est d'exposer des problèmes simples de conception de réseaux qui m'ont intrigués pendant de nombreuses années et continuent de m'intriguer. Les réseaux de télécommunications mais aussi les réseaux routiers ou sociaux se modélisent bien avec des graphes. Les sommets représentent les routeurs (abonnés, villes, individus...) et les arêtes des liaisons ou des relations. Je partirai d'un problème simple à énoncer mais difficile à résoudre : comment construire des réseaux (graphes) de degré et de diamètre donnés. J'essaierai de montrer l'imagination débordante dans les outils utilisés (géométries finies, graphes probabilistes, groupes, constructions récursives, constructions sur alphabets, ...
Voir la vidéo
Label UNT Conférences

le (1h1m43s)

Competition and Cooperation

Numerous applications of economics are based on models that assume individual economic actors take prices as given. Indeed, this assumption underlies many empirical studies. The question of whether such an assumption can be justified as arising in the context of individual and group optimizing behavior has been the subject of extensive investigation.One answer to the question originates with the work of Edgeworth (1881), which argues that groups individuals cannot improve upon their part of a price-taking economic equilibrium by cooperation, that is, the set of outcomes that are stable against collective activities of groups – the core-- is equivalent to ...
Voir la vidéo
Label UNT Conférences

le (58m54s)

Swarms: First Class Citizens in the Future Internet (série : Colloquium Jacques Morgenstern)

The current Internet consists of tens of thousand different interconnected autonomous networks. It was designed to support large populations of point-to-point content transfers. This introduces considerable headaches due imbalances in traffic flows, which has the effect of complicating network management, reducing the robustness of the Internet, and reducing user performance. In this talk, I review the sources of traffic in the Internet over the last 20 years. We will observe that this an increasing fraction of traffic was generated by peer-to-peer (P2P) "swarm" technology from 2000 to 2007. I examine how and why P2P swarm technology simplifies network management, ...
Voir la vidéo
Label UNT Conférences

le (55m20s)

Recent research at Pixar

In this talk I will survey a number of current and recent projects underway in the Research Group at Pixar. To set context for the discussion I'll begin with a brief overview of our production pipeline. I'll also discuss how we approach research at Pixar, including how we pick problems, what we look for when we consider the adoption of external research, and how we transfer technology to the rest of the studio.
Voir la vidéo

 
Cerimes