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DEVI Webinar – Paul Rochet (ENAC)

10/12/2020 @ 10h30 – 11h30 – A coupling of the spectral measures at a vertex Abstract I will introduce a particular coupling of the spectral measures at the vertices of a graph, whose moments count the rooted closed paths in the graph. The resulting joint spectral measure verifies numerous interesting properties that allow to recover minors of analytical functions of the […]

DEVI Webinar – Miguel Urdanoz (TBS)

26/11/2020 @ 10h30 – 11h30 – Airline Scheduling: learning from past errors Abstract On time performance is a key attribute to attract airline’s customers. Airlines can control on time performance by enlarging schedule times and indeed airlines have been doing so over the last decades although this implies higher costs for their operations. For instance, according to Zhang et al (2018) […]

DEVI Webinar – Bertrand Jouve (CNRS)

12/11/2020 @ 10h30 – 11h30 – Graph Mining by Vertex Dismantlings Abstract When considering the topology of complex networks, an important question is how local topological constraints impact the overall topology of the network. This issue is addressed from a mathematical perspective by examining some particular families of graphs. For these graphs, the results of an exploration of the vertices in […]

DEVI Seminar – Pierre-Cyril Aubin-Frankowski (Mines ParisTech)

08/10/2020 @ 10h30 – 11h30 – State-constrained Linear-Quadratic Optimal Control as a Kernel Regression with Hard Shape Constraints Abstract Regression problems in control or machine learning typically involve shape constraints, such as positivity or monotonicity on a prescribed compact set. Such constraints stem from qualitative priors or physical constraints, and can often be written as an infinite number of pointwise inequalities. […]

DEVI Seminar – Ricardo Flores-Fillol (Universitat Rovira i Virgili, Tarragona, Spain)

24/09/2020 @ 10h30 – 11h30 – Market structure and quality determination for complementary products: Alliances and service quality in the airline industry (with Jan K. Brueckner) Abstract This paper explores the effect of market structure on quality determination for complementary products. The focus is on the airline industry and the effect of airline alliances on flight frequency, an important element of […]

DEVI Seminar – Isabelle Laplace & Pascal Lezaud (ENAC)

10/09/2020 @ 10h30 – 11h30 – Environmental challenges and the future of air transport (the seminar will be given in French) Abstract The federation’s ESTEAM group has written a white paper on the future of air transport in light of environmental challenges. The purpose of the seminar is to present a few of the points that are covered in this white […]

Webinar DEVI – Tat-Dat To (ENAC)

25/06/2020 @ 10h30 – 11h30 – A modification of quasi-Newton’s methods helping to avoid saddle points Résumé: We propose a new modification of quasi-Newton’s methods, namely New Q-Newton’s method. The main idea is to approximate the Hessian matrix by a invertible (not necessarily positive definite) symmetric matrix, then update the Newton step by the difference of the projections of the standard […]

DEVI Seminar – Alix Rigal (ENAC)

27/02/2020 @ 10h30 – 11h30 – Evolution of daily temperature due to global change Abstract We consider the problem of estimating non-stationary temperature normals (the mean), at a daily timescale, which take into account deformations due to the global change of the annual cycle. In a second step, we consider not only the mean, but the whole distribution. Thus, we will […]

DEVI Seminar – Anne Ruiz-Gazen (Toulouse School of Economics)

23/01/2020 @ 10h30 – 11h30 – Multivariate Student versus Multivariate Gaussian Regression Models with Applications to Finance and Political Economy Abstract For modeling multivariate possibly heavy-tailed data, we compare the multivariate normal regression model (N) with two versions of the multivariate Student regression model: the independent multivariate Student (IT) and the uncorrelated multivariate Student (UT). We recall some facts about these […]

DEVI Seminar- Stéphane Puechmorel (ENAC)

12/12/2019 @ 10h30 – 11h30 – Foliation of statistical manifold Summary: A statistical manifold is formally a Riemannian manifold with two dual connections. This abstract object appears naturally when we study parameterized families of densities and formalize some common estimation procedures. In this paper we will address as intuitively as possible the structural questions relating to statistical manifolds and in particular […]