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href="https://cermics-lab.enpc.fr/seminaires/data-transitions/">Data Transitions</a></li> </ul> </li> <li class="menu-item menu-item-type-post_type menu-item-object-page menu-item-4770"><a href="https://cermics-lab.enpc.fr/cauchy-fellowship/">Cauchy fellowship</a></li> <li class="menu-item menu-item-type-post_type menu-item-object-page menu-item-24"><a href="https://cermics-lab.enpc.fr/annuaire/">People</a></li> <li class="menu-item menu-item-type-post_type menu-item-object-page menu-item-113"><a href="https://cermics-lab.enpc.fr/acces/">How to find us</a></li> </ul></div> </nav> </header> <div id="main" class="wrapper"> <div id="primary" class="site-content border-none"> <div id="content" role="main"> <article id="post-69" class="post-69 page type-page status-publish hentry"> <header class="entry-header"> <h1 class="entry-title">CERMICS Colloquium</h1> </header> <div class="entry-content"> <div class="post"> <p><strong>See the <a href="https://calendar.google.com/calendar/embed?src=polytechnique.org_mtciqkdgk679fo5h6vig5nihjc%40group.calendar.google.com&ctz=Europe%2FParis">Google Agenda of the colloquium</a>, and add the <a href="https://calendar.google.com/calendar/ical/polytechnique.org_mtciqkdgk679fo5h6vig5nihjc%40group.calendar.google.com/public/basic.ics">iCal url</a> to your calendar.</strong></p> <hr /> <h2><span style="text-decoration: underline">Forthcoming sessions</span></h2> </div> <h2>Josselin Garnier (Académie des Sciences et École polytechnique)</h2> <p>Thursday, April 10th, 2025, 14h – Salle de séminaire du CERMICS</p> <h4>Utilisation de modèles d’ordre réduit pour l’imagerie par ondes</h4> <p>Dans cet exposé on considère un problème inverse classique lié à l’équation des ondes. Des capteurs sondent un milieu inconnu avec des impulsions et mesurent les ondes rétrodiffusées par le milieu. L’objectif est d’estimer la carte de vitesse du milieu à partir des signaux mesurés par les capteurs. Dans ces conditions, la méthode conventionnelle de référence est appelée inversion de formes d’ondes complètes (Full Waveform Inversion – FWI). C’est une méthode des moindres carrés en grande dimension qui consiste à ajuster la carte de vitesse d’un modèle numérique pour minimiser la différence entre les signaux mesurés et les signaux générés par ce modèle. On verra que la fonction objectif de ce problème d’optimisation est non convexe et qu’elle présente de nombreux minima locaux. Une nouvelle approche de la FWI basée sur un modèle d’ordre réduit de l’opérateur de l’équation des ondes est introduite et on verra que la minimisation de la fonction objectif correspondante donne de bien meilleurs résultats, pour l’équation des ondes scalaire et pour des systèmes hyperboliques généraux du premier ordre. L’exposé est basé sur des travaux en collaboration avec L. Borcea (Columbia Univ.), A. Mamonov (Univ. Houston), J. Zimmerling (Univ. Uppsala).</p> <hr /> <h2><span style="text-decoration: underline">Past sessions</span></h2> <p><strong>François Golse (École polytechnique)<br /> </strong><em>Wednesday, November 20th, 2024, 14h – Salle de séminaire du CERMICS</em><br /> <span style="text-decoration: underline">Distance de Wasserstein et observabilité en dynamique quantique</span> (<a href="https://cermics-lab.enpc.fr/wp-content/uploads/2024/11/slides_golse_2024.pdf">slides</a>)<span style="text-decoration: underline"><br /> </span></p> <p><strong>Nalini Anantharaman (Académie des Science et Collège de France)</strong><br /> <em>Wednesday, May 22nd, 2024, 10h – Salle de séminaire du CERMICS<br /> </em><span style="text-decoration: underline">Trou spectral des surfaces hyperboliques aléatoires</span></p> <p><strong>Andrea Lodi (Cornell Tech)</strong><br /> <em>Friday, February 9th, 2024, 10h30 – Salle de séminaire du CERMICS<br /> </em><span style="text-decoration: underline">Mixed-Integer Programming: 75 years of history and the Artificial Intelligence challenge</span> (<a href="https://cermics.enpc.fr/~reygnerj/cs/slides_lodi.pdf">slides</a>)<span style="text-decoration: underline"><br /> </span></p> <p><strong>Andrew Stuart (Caltech)<br /> </strong><em>Thursday, December 14th, 2023, 15h – Salle de séminaire du CERMICS<br /> </em><span style="text-decoration: underline">Learning Solution Operators For PDEs: Algorithms, Analysis and Applications</span> (<a href="https://cermics-lab.enpc.fr/wp-content/uploads/2023/12/APDE.pdf">slides</a>)<span style="text-decoration: underline"><br /> </span></p> <p><strong>Peter K. Friz (TU and WIAS Berlin)<br /> </strong><em>Thursday, June 8th, 2023, 14h – Salle de séminaire du CERMICS<br /> </em><span style="text-decoration: underline">Reconciling Itô and rough path theory</span> (<a href="https://cermics-lab.enpc.fr/wp-content/uploads/2016/12/slides_friz.pdf">slides</a>)</p> <p><strong>Maciej Zworski (University of California, Berkeley)</strong><br /> <em>Wednesday, April 19th, 2023, 14h – Salle de séminaire du CERMICS<br /> </em><span style="text-decoration: underline">Magic angles in the chiral model of twisted bilayer graphene</span> (<a href="https://math.berkeley.edu/~zworski/cermics_no_pause.pdf">slides</a>)</p> <p><strong>Jean-Bernard Lasserre (CNRS, Université de Toulouse)</strong><br /> <em>Monday, December 12th, 2022, 14h – Salle de séminaire du CERMICS<br /> </em><span style="text-decoration: underline">Moments, positive polynomials and the Christoffel function</span> (<a href="https://cermics.enpc.fr/~reygnerj/cs/slides_lasserre.pdf">slides</a>)</p> <p><strong>Hugo Duminil-Copin (IHES, Université de Genève)<br /> </strong><em>Thursday, March 10th, 2022, 14h – Salle de séminaire du CERMICS<br /> </em><span style="text-decoration: underline"><span style="color: #000000;text-decoration: underline">Symétries émergentes en physique statistique planaire</span></span><span style="color: #000000"> (<a href="https://cermics.enpc.fr/~reygnerj/cs/slides_duminil.pdf">slides</a>)</span><span style="text-decoration: underline"><span style="color: #000000;text-decoration: underline"><br /> </span></span></p> <div><strong>Benoît Perthame (Académie des Sciences, Sorbonne Université)</strong></div> <p><em>Wednesday, October 6th, 2021, 14h – Salle de séminaire du CERMICS<br /> </em><span style="text-decoration: underline"><span style="color: #000000;text-decoration: underline">Structured equations in biology</span></span><span style="color: #000000"> (<a href="https://cermics-lab.enpc.fr/wp-content/uploads/2016/12/slides_perthame_2021.pdf">slides</a>)</span><span style="text-decoration: underline"><span style="color: #000000;text-decoration: underline"><br /> </span></span></p> <p><strong>Jean-Michel Coron (Académie des Sciences, Sorbonne Université)</strong><strong><br /> </strong><em>Wednesday, January 22th, 2020, 14h – Salle de séminaire du CERMICS</em><br /> <span style="text-decoration: underline">Comment utiliser les non-linéarités pour contrôler un système</span> (<a href="https://cermics-lab.enpc.fr/wp-content/uploads/2020/01/slides_coron.pdf">slides</a>)</p> <p><strong>Serge Abiteboul (Académie des Sciences, ENS/Inria, ARCEP)<br /> </strong><em>Wednesday, January 22th, 2020, 10h – Salle de séminaire du CERMICS<br /> </em><span style="text-decoration: underline">Responsible data management</span> (<a href="https://cermics.enpc.fr/~reygnerj/cs/slides_abiteboul.pdf">slides</a>)</p> <p><strong>János Pach (Renyi Institute Budapest and MIPT Moscow, Bézout Chair 2019)</strong><br /> <em>Jointly organized with Labex Bézout<br /> Tuesday, November 12th, 2019, 14h – Salle de séminaire du CERMICS<br /> </em><span style="text-decoration: underline">How to escape the curse of dimensionality in combinatorics</span></p> <p><strong>Stéphane Mallat (Collège de France et Académie des Sciences)<br /> </strong><em>Friday, September 20th, 2019, 10h –<span style="color: #000000"> Amphi Caquot I<br /> </span></em><span style="text-decoration: underline">Mathematical Mysteries of Deep Neural Networks</span> (<a href="https://cermics.enpc.fr/~reygnerj/cs/slides_mallat.pdf">slides</a>)<span style="text-decoration: underline"><br /> </span></p> <p><strong>Alice Guionnet (ENS Lyon et Académie des Sciences)<br /> </strong><em>Tuesday, June 25th, 2019, 10h – Salle de séminaire du CERMICS<br /> </em><span style="text-decoration: underline">Entropie et grandes déviations en théorie des matrices aléatoires</span></p> <p><strong>Frank Merle</strong> <strong>(</strong><b>Université de Cergy-Pontoise et IHES</b><strong>)<br /> </strong><em>Thursday, January 10th, 2019, 10h – Salle de séminaire du CERMICS<br /> </em><span style="text-decoration: underline">Asymptotics for Critical Nonlinear Dispersive Equations</span> (<a href="https://cermics-lab.enpc.fr/wp-content/uploads/2016/12/slides_merle.pdf">slides</a>)</p> <p><strong>Felix Otto (MPI Leipzig)</strong><br /> <em>Tuesday, November 20th, 2018, 10h – Salle de séminaire du CERMICS<br /> </em><span style="text-decoration: underline">Randomness in Partial Differential Equations</span> (<a href="https://cermics-lab.enpc.fr/wp-content/uploads/2016/12/slides_otto.pdf">slides</a>)<span style="text-decoration: underline"><br /> </span></p> <p><strong>R. Tyrrell Rockafellar (University of Washington)<br /> </strong><em>Thursday, October 25th, 2018, 9h – Salle de séminaire du CERMICS<br /> </em><span style="text-decoration: underline">Part I: The Role of Convex Analysis in Optimization</span> (<a href="https://cermics-lab.enpc.fr/wp-content/uploads/2016/12/slides_rockafellar_1.pdf">slides</a>)<br /> <span style="text-decoration: underline">Part II: Progressive Decoupling of Linkages in Optimization with Elicitable Convexity</span> (<a href="https://cermics-lab.enpc.fr/wp-content/uploads/2016/12/slides_rockafellar_2.pdf">slides</a>)</p> <p><strong>Carsten Carstensen (Humboldt-Universität zu Berlin, Germany)<br /> </strong><em>Tuesday, September 4th, 2018, 14h – Salle de séminaire du CERMICS<br /> </em><span style="text-decoration: underline">Discontinuous Petrov-Galerkin Schemes</span> (<a href="https://cermics-lab.enpc.fr/wp-content/uploads/2016/12/slides_carstensen.pdf">slides</a>)</p> <p><strong>Bjorn Engquist (The University of Texas at Austin)</strong><br /> <em>Thursday, June 7th, 2018, 15h30 – Salle de séminaire du CERMICS<br /> </em><span style="text-decoration: underline">Multiscale dynamical systems and parareal algorithms (<a href="https://cermics-lab.enpc.fr/wp-content/uploads/2016/12/slides_engquist.pdf">slides</a>)</span></p> <p><strong>Arturo Kohatsu-Higa (Ritsumeikan University)</strong><br /> <em>Thursday, May 31st, 2018, 15h15 – Salle de séminaire du CERMICS<br /> </em><span style="text-decoration: underline">IPB pour diffusions arrêtées</span></p> <p><strong>Panagiotis <span class="il">Souganidis</span> (The University of Chicago)</strong><br /> <em>Friday, May 18th, 2018, 16h – Salle de séminaire du CERMICS<br /> </em><span style="text-decoration: underline">Nonlinear stochastic partial differential equations (<a href="https://cermics-lab.enpc.fr/wp-content/uploads/2016/12/slides_souganidis.pdf">slides</a>)</span><strong><br /> </strong></p> <p><strong>Yann Brenier (ENS)</strong><br /> <em>Monday, March 5th, 2018, 10h30 – Salle de séminaire du CERMICS<br /> </em><span class=""><span style="text-decoration: underline">Le problème de Cauchy pour les systèmes de lois de conservation entropiques traité par minimisation convexe (<a href="https://cermics-lab.enpc.fr/wp-content/uploads/2016/12/slides_brenier.pdf">slides</a>)</span></span><strong><br /> </strong></p> <p><strong>Laure Saint-Raymond (ENS de Lyon </strong><b>et Académie des Sciences</b><strong>)</strong><br /> <em>Monday, December 18th, 2017, 14h – Salle de séminaire du CERMICS<br /> </em><span class=""><span style="text-decoration: underline">Forçage quasi-résonnant d’ondes internes dans un domaine avec topographie</span></span><br class="" /><span class="">(en collaboration avec Yves Colin de Verdière)</span><strong><br /> </strong></p> <p><strong>Daniel Kuhn (EPFL)</strong><br /> <em>Wednesday, October 4th, 2017, 15h30 – Salle de séminaire du CERMICS<br /> </em><u>Data-driven Distributionally Robust Optimization Using the Wasserstein Metric: Performance Guarantees and Tractable Reformulations</u></p> <p><strong>Arnak Dalalyan (ENSAE)</strong><br /> <em>Thursday, June 15th, 2017, 10h<br /> </em><span style="text-decoration: underline">On the Exponentially Weighted Aggregate with the Laplace Prior</span></p> <p><strong>Mitchell Luskin (University of Minnesota)</strong><br /> <em>Monday October 17th, 2016, 2016, 14h</em><br /> <u>Mathematical Modelling of Incommensurate Materials</u></p> <p><strong>Common seminar CERMICS/IMAGINE</strong><br /> <i>Tuesday June 7th, 2016, 10h<br /> </i>10h : Mathieu Aubry (IMAGINE, École des Ponts ParisTech), <u>Representing 3D models for matching and retrieving</u> (<a href="http://cermics.enpc.fr/cermics-seminaires/seminaires/cs/Seminaire15-16/AubryAbstract.pdf">abstract</a>, <a href="http://cermics.enpc.fr/cermics-seminaires/seminaires/cs/Seminaire15-16/AubrySlides.pdf">slides</a>),<br /> 11h : Francis Bach (Inria et ENS), <u>Beyond stochastic gradient descent for large-scale machine learning</u> (<a href="http://cermics.enpc.fr/cermics-seminaires/seminaires/cs/Seminaire15-16/BachAbstract.pdf">abstract</a>, <a href="http://cermics.enpc.fr/cermics-seminaires/seminaires/cs/Seminaire15-16/BachSlides.pdf">slides</a>).</p> <p><strong>Emilie Kaufmann </strong><small class="aff"><strong>(CNRS)</strong><br /> </small><i>Wednesday March 30th, 2016, 14h<br /> </i><u>Multi-armed bandit models: a tutorial <a href="http://cermics.enpc.fr/cermics-seminaires/seminaires/cermics/multiarmed-bandit.pdf"> (slides)</a></u></p> <p><strong>Hugo Touchette </strong><small class="aff"><strong>(National Institute for Theoretical Physics)</strong><br /> </small><i>Monday November 30th, 2015, 14h<br /> </i><u>Théorie des grandes déviations : des mathématiques à la physique. <a href="http://cermics.enpc.fr/cermics-seminaires/seminaires/cermics/ldt-cermics1.pdf"> (slides)</a></u></p> </div> <footer class="entry-meta"> </footer> </article> <div id="comments" 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