All Years Seminars
[INMA] 2007-02-15 (16.30pm) : Colloquium CESAME/MAPA "Abraham De Moivre : Génie en exil."
At Institut de statistique (C045)
Speaker :
Christian Genest (Université Laval, Québec
)
Abstract :
Le 27 novembre 2004 a marqué le 250e anniversaire du décès d'Abraham De Moivre,
dont la célèbre approximation de la loi binomiale a inspiré le théorème limite central. Calviniste français
exilé en Angleterre, De Moivre fut l'un des grands pionniers de la théorie classique des probabilités.
Il contribua en outre de façon significative à la géométrie analytique, à l'analyse complexe et au calcul des rentes.
Un résumé de sa vie et de son oeuvre sera présenté dans le contexte social et scientifique de l'époque. Cet exposé
s'appuie sur des travaux réalisés en collaboration avec David R. Bellhouse, de l'Université de l'Ontario occidental.
[INMA] 2007-02-13 (14pm) : "Complex networks : modeling and metrology "
At Auditoire Euler
Speaker :
Guillaume, Jean-Loup
Abstract :
The study of complex networks, or large graphs appearing in real contexts, has exploded since a few years, considering either problems
specific to some networks, like web-page ranking or spread of viruses over the Internet, or some generalizations of these problems like
the study of the measurement biases, analysis or modeling of complex networks, etc. During this seminar, two different problems related
to complex networks will be presented: the modeling of complex networks and the metrology of complex networks applied to the case
of the Internet.
- The modeling part will be presented using a random bipartite model. While this model was initially introduced to model some specific
complex networks, it can easily be used for most of them.
- The metrology part will be dedicated to the case of the Internet. After a brief presentation of the problem, I will show some simulations
results which where aimed at evaluating the bias that can appear when one wants to measure a network like the Internet using a tool like
traceroute, and the benefit one can have using many different sources to explore the network.
[INMA] 2007-02-08 (16.30pm) : Colloquium CESAME/MAPA "Quelques spécimens d'une zoologie des groupes simples."
At Auditoire Ch.-J de La Vallée Poussin (cycl 01)
Speaker :
Pierre-Emmanuel Caprace (Oxford University)
Abstract :
Les groupes simples constituent en quelque sorte les particules élémentaires de la théorie de groupes.
On admet souvent comme une évidence tacite le fait qu'une théorie générale les décrivant tous est illusoire.
Le but de cet exposé est d'illustrer cela en présentant diverses sources élémentaires d'exemples concrets de groupes simples infinis.
[INMA] 2007-02-06 (14pm) : "Consensus on the N-Torus and Collective Motion in Three Dimensions"
At Auditoire Euler
Speaker :
Luca Scardovi (ULg)
Abstract :
Over the past decade, particular attention has been devoted to the study of collective problems where interacting agents must
reach a common objective under information and communication constraints. These problems arise in a variety of disciplines
including physics, biology, computer science and systems and control theory. In this talk a design methodology is presented to address
collective problems in presence of mild assumptions on the communication topology. In the first part of the talk, we study the behavior
of a network of $N$ agents, each evolving on the circle. We propose a novel algorithm that achieves synchronization or balancing in phase
models under mild connectedness assumptions on the (possibly time-varying and
unidirectional) communication graphs. In the second part of the talk, we address the problem of stabilizing relative equilibria in
a model of identical, steered particles moving in three-dimensional Euclidean space. We provide static and dynamic control laws
to achieve the desired equilibria in presence of all-to-all and limited communication respectively.
[INMA] 2007-02-02 (16.15 pm) : "Microstructure and micromechanics of hard biological tissues : from lobster cuticle to human bone"
At Salle séminaire TERM, Bâtiment Stevin
Speaker :
Sveto Nikolov
(MPIE, Dusseldorf)
Abstract :
Seminars
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