|
|
Mardi 29 Mai
Heure: |
11:00 - 12:00 |
Lieu: |
Salle B107, bâtiment B, Université de Villetaneuse |
Résumé: |
(CIP) Discussion on graph rewriting systems (with examples and equations) |
Description: |
Nicolas Behr Séminaire annulé à cause de difficultés de transport. Le séminaire de 14h00 est maintenu. |
Heure: |
14:00 - 16:00 |
Lieu: |
Salle B107, bâtiment B, Université de Villetaneuse |
Résumé: |
Combinatorics of chemical reaction systems |
Description: |
Nicolas Behr Reporting on recent work with G.H.E. Duchamp and K.A. Penson (arXiv:1712.06575), I plan to present a formulation of chemical reaction systems in the so-called stochastic mechanics formalism. This approach allows to uncover some deep relationships between the combinatorial techniques of boson normal-ordering and the dynamics of chemical reaction networks: each semi-linear reaction type induces an evolution within a space of probability distributions that can be computed explicitly via our techniques. For the interesting remaining types of reactions, some results involving systems of Sobolev-Jacobi orthogonal polynomials will be presented. |
Jeudi 31 Mai
Heure: |
12:15 - 13:30 |
Lieu: |
Salle B107, bâtiment B, Université de Villetaneuse |
Résumé: |
Graphes dynamiques - Modélisation et Clustering |
Description: |
Tabea Rebafka To model recurrent interaction events we propose a new dynamic random graph model : an extension of the stochastic block model in continuous time, where every individual (node) belongs to a latent group and interactions (edges) between two individuals are modelled using inhomogeneous Poisson processes. We develop a semiparametric variational expectation-maximization algorithm to estimate model parameters and to perform a clustering of the nodes. We illustrate the performance of our method on real datasets. |
|
|