Journées annuelles de la fédération occimath

Liste des Contributions

1. Energy-consistent modeling and simulation of stents in arterial tissues

Francesco BONALDI

27/05/2026 14:00

In this talk, we focus on the modeling and simulation of large-strain (hyperelastic) elasticity problems, with particular application to the study of soft biological tissues. We also consider frictional contact between two hyperelastic bodies, with application to the deployment of a stent in an arterial tissue. For the numerical approximation, the key idea is to design a time integration...

2. Pierre CALKA

27/05/2026 15:00

3. A mathematician's view on symmetries of quantum fields

David JORDAN

27/05/2026 16:30

The past four decades have witnessed a vibrant and profound dialog between mathematics and quantum physics. The fundamental driving challenge here is how to reconcile the rigid algebraic structures of quantum physics with the geometric fluidity of relativistic spacetime. It turns out that such questions, and their as yet woefully incomplete answers, are as illuminating within pure...

4. Bilel BENSAID

28/05/2026 09:00

5. Geometric properties of optimizers for the maximum gradient of the torsion function via probabilistic approaches

Ilias FTOUHI

28/05/2026 09:50

We consider the shape optimization problem of looking for the shape that maximizes the maximal norm of the gradient of the torsion function among planar convex sets with a prescribed measure (or perimeter). We prove the existence of such a shape and prove that its boundary is C^1 regular. Then, we show that its boundary contains a segment. The proofs are mainly based on probabilistic arguments...

6. Un tour d’horizon des résultats récents sur les algorithmes inertiels dans un cadre déterministe

Aude RONDEPIERRE

28/05/2026 11:00

7. Cross-Modality Alignment for Integration of Spatial Omics Data

Benjamin CHARLIER

28/05/2026 14:00

Abstract: Advances in spatial omics sequencing now enable acquisition of massive subcellular-scale datasets (millions of reads with hundreds of detectable genes). However, heterogeneity in measured features, spatial resolution, and physical sampling scope across technologies and experimental protocols introduces significant challenges for integrating these datasets within reference coordinate...

8. Sophie LEBRE

28/05/2026 14:50

9. Time series forecasting with hybrid physics-data models: application to lake thermal stratification

David METIVIER

28/05/2026 16:00

Forecasting the future state of a dynamical system from observed time series is a central problem across science and engineering.
Classical autoregressive models offer simplicity and interpretability but struggle with complex nonlinear dynamics.
Deep learning architectures such as Recurrent Neural Networks overcome this limitation yet offer no physical guarantees, leading to unphysical...

10. A general theory for extremal regression in heavy-tailed models

Abdelaati DAOUIA

29/05/2026 09:00

Studying rare events at the heavy tails of conditional Pareto-type distributions, in the presence of high-dimensional covariates, is a burgeoning science with many applications in actuarial, financial and environmental risk management. The most prominent risk measures to quantify these events utilize conditional quantiles, Expected Shortfall, and expectiles at extreme levels. The few attempts...

11. Efficient estimation of Sobol' indices of any order from a single input/output sample

Agnès LAGNOUX

29/05/2026 09:50

12. An alternative ranking system for biathlon pursuit races

Rémi SERVIEN

29/05/2026 11:00

Biathlon is an Olympic sport combining cross-country skiing with rifle shooting, giving a penalty for each target miss. The biathletes ran different race formats, including the pursuit race. During this race, the biathletes chase the leader with a start time identical to the result of the sprint race previously achieved. So, pursuit involves different skills (such as tactics or management of...