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Prof. Marc PEIGNE (Laboratoire de Mathématiques et Physique Théorique, Faculté des Sciences et Techniques Université François Rabelais, France.)09/07/2018 09:00We describe the asymptotic behavior of the Buridan’s wandering using technics developed to study iterated Lipschitz functions systems with possibly place dependent probabilities. Under some general conditions on this family of probabilities and using quasi-compact linear operators technics, we obtain a necessary and sufficient condition for the uniqueness of the stationary probability measure...Aller à la page de la contribution
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Prof. Mounir HADDOU (Centre de mathématiques Institut National des Sciences Appliquées de Rennes, France.)09/07/2018 10:00We propose a new family of relaxation schemes for mathematical programs with complementarity constraints that extends the relaxations converging to an M-stationary point. We discuss the properties of the sequence of relaxed non-linear programs as well as stationarity properties of limiting points. We prove under a new and weak constraint qualification, that our relaxation schemes have the...Aller à la page de la contribution
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10. Numerical solution of a class of delay differential-algebraic equations by half-explicit methodsProf. Hoang Linh VU (Faculty of Mathematics - Mechanics and Informatics, Vietnam National University, Hanoi, Vietnam.)09/07/2018 11:00Delay differential-algebraic equations (DAEs) can be used for modeling real-life phenomena that involve simultaneously time-delay effect and constraints. It is also known that solving delay DAEs is more complicated than solving non-delay ones because interpolation errors for the solution in the past time may arise in addition to discretisation errors. Recently, we have investigated the...Aller à la page de la contribution
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Dr Tien Dat CAO (Texas Tech University)09/07/2018 14:00We study the large time behavior of solutions to the three-dimensional Navier-Stokes equations with periodic boundary conditions. It is shown that if the force has an asymptotic expansion, as time tends to infinity, with respect to certain families of decaying functions in Sobolev-Gevrey space, then any weak solution admits an asymptotic expansion of the same type. In particular, we establish...Aller à la page de la contribution
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Dr Thi Thanh Phuong TRUONG (Qui Nhon University)09/07/2018 14:00This talk is aimed to present a single-product multi-criteria traffic network with capacity constraints. We construct an optimization problem, whose optimal solutions are exactly equilibria of the model. Since the objective function of this problem is neither continuous nor convex, we propose a method to smoothen it and use optimization tools to find optimal solutions of smooth optimization...Aller à la page de la contribution
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Dr Van Luyen LE (University of science, VNU-HCMUS)09/07/2018 14:45Multivariate public key cryptography (MPKC) is one of the main candidates for post-quantum cryptography. Rainbow, an improved (multi-layer) version of Unbalanced Oil and Vinegar (UOV), is one of the most famous multivariate signature scheme that is a promising candidate for NIST standardization. At INDOCRYPT 2017, Beullens and Preneel introduced a new variant LUOV of UOV. Their idea is to...Aller à la page de la contribution
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Dr Duc Duy PHAN (Tampere University of Technology)09/07/2018 14:45This is a joint work with Lassi Paunonen and Petteri Laakkonen, Tampere University of Technology. We consider the robust output tracking problem on state space $H$ $$ \dot{x} (t) = A x(t) + B u(t),$$ $$ y(t) = C x(t) + D u(t),$$ where $x$ is the state, $u$ is the input (control), and $y$ is the output (observation). Our goal is to design a dynamic feedback controller of the form...Aller à la page de la contribution
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Dr Thi Thu Van NGUYEN (University of science, VNU-HCMUS)09/07/2018 15:45In this talk a quasi-equilibrium problem with a nonmonotone bifunction is considered in a finite dimensional space. This is a kind of equilibrium problem in sense of Blum and Oettli, or also called Ky Fan inequality, with a constraint set depending on the current point. An extragradient-type method is presented and analyzed for its solution. The convergence of the method is proved under the...Aller à la page de la contribution
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Dr Hoang Chuong LAM (Can Tho University)09/07/2018 15:45We prove the quenched central limit theorem and the law of large numbers for reversible random walks in a stationary random environment on $Z$. In this model, the conductivity of the edge between $[k; k+1]$ is equal to $\alpha_{k} c(T^{k}\omega)$, where $\alpha_{k}$ be a positive number and $c$ be a positive measurable function on $\Omega.$ Fix $\omega \in \Omega,$ we consider the Poisson...Aller à la page de la contribution
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Dr Thanh Hoang Nhat LE (Oxford University Clinical Research Unit, Wellcome Trust Major Overseas Programme, Vietnam)09/07/2018 16:30*Background*: Early fungicidal activity (EFA), i.e. the CSF clearance rate of quantitative yeast culture colony counts during the first 14 days of antifungal therapy, is often used as the primary endpoint in phase II trials in HIV-associated cryptococcal meningitis. While associations between EFA and survival have been reported, it is unclear whether EFA is a surrogate marker. *Methods*:...Aller à la page de la contribution
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Dr Le Hoang Anh Nguyen (University of science, VNU-HCMUS)09/07/2018 16:30In the talk, we discuss calculus rules of second-order composed contingent derivatives for set-valued maps. More precisely, chain rule and sum rule are established, and their applications to some particular mathematical models are obtained. Then, sensitivity analysis in set-valued optimization using second-order composed contingent derivatives are proposed.Aller à la page de la contribution
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Prof. Fabrice PLANCHON10/07/2018 09:00
We will review recent results on the propagation
Aller à la page de la contribution
of waves on domains, with emphasis on two extreme
cases: the exterior or the interior of a stricly convex
domain. Understanding the wave localization, its
amplitude and how it decays is fundamental for
several (unrelated) problems and we will describe an
interesting interplay between geometrical aspects and
degenerate oscillatory integrals that... -
9. Optimized wavelet-Gaussian mixed bases for electronic structure calculations in quantum chemistryProf. Quang Huy TRAN (IFPEN)10/07/2018 10:00Many applications of quantum chemistry involve ab initio simulations. These are feasible thanks to well-known approximations to the Schrödinger equation, such as Hartree-Fock’s or Density Functional Theory. More than 70 softwares are available to chemists in this field, the most common ones being VASP, Gaussian and ABINIT. A key difference between them lies in the basis functions selected to...Aller à la page de la contribution
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Prof. Laurence Halpern10/07/2018 11:00
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Dr Thi Da Cam PHAM (Institut Denis Poisson, Faculté des sciences, Tours, France.)10/07/2018 14:00Inspired by a recent paper of I. Grama, E. Le Page and M. Peigné, we consider a sequence $(g_n)_{n \geq 1}$ of i.i.d. random $d \times d -$ matrices with non negative entries and study the fluctuations of the process $(\log | g_n ... g_1 x ) {n \geq 1}$ for any non-zero vector $x$ in $R^d$ with non-negative coordinates. Our method involves approximating this process by a martingale and ...Aller à la page de la contribution
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Dr Tan Trung NGUYEN (Department of Mathematical Sciences Bath University)10/07/2018 14:00This is a joint work with A. Walker, R. Scheichl and C.A. Yates, Bath University Kinetic Monte Carlo (KMC) methods [1] are widely used to simulate the surface adsorption, diffusion, growth, statistical physics, radiation damage annealing, bioglogical systems, amongst other applications by evolving systems dynamically from state to state. In our application to solar cells, KMC are...Aller à la page de la contribution
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Dr Thi Nguyet Nga TA (University of science, VNU-HCMUS)10/07/2018 14:45We study stationary equation governed by the operator $ -\nabla \cdot A(x, \nabla u) = \mu$ in the case where $A(x, \xi)$ is a maximal monotone graph and $\mu$ is a Radon measure. Our main interest concerns the typical situation where $A(x, .)$ is defined only in a bounded region of $\mathbf{R}^n$; so that $A(x, .)$ does not satisfies the standard polynomial growth control condition. The...Aller à la page de la contribution
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Dr Nguyen Van Vuong DO (Ton Duc Thang University)10/07/2018 14:45In this study, a development of nonlinear continuum damage mechanics (CDM) model for multiaxial high cycle fatigue is proposed in which the cyclic plasticity constitutive model has been incorporated in the finite element (FE) framework. T-joint FE simulation of fillet welding is implemented to characterize sequentially coupled three-dimensional (3-D) of thermo-mechanical FE formulation and...Aller à la page de la contribution
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Dr Anh Ha LE (University of science, VNU-HCMUS)10/07/2018 15:30In this paper, we will consider a posteriori error estimation for the transport equation $\partial_t u+\mathbf{a}(x,t)\cdot\nabla u=0$ with the initial data $u_0\in L^\infty\cap BV_{{\rm loc}}$ and the divergence of the velocity field $\mathbf{a}$ is not equal to zero. An a posteriori estimate for the error between the exact solution and the solution of an upwind finite volume scheme is...Aller à la page de la contribution
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Dr Thanh Binh NGUYEN (University of science, VNU-HCMUS)10/07/2018 15:30In this work, we introduce a novel method for solving the set inversion problem by formulating it as a binary classification problem. Aiming to develop a fast algorithm that can work effectively with high-dimensional and computation- ally expensive nonlinear models, we focus on active learning, a family of new and powerful techniques which can achieve the same level of accuracy with fewer data...Aller à la page de la contribution
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Prof. Richard EMILION (Mathématiques – Analysie, Probabilités, Modélisation, Université d’Orléans, France.)11/07/2018 09:00Our context is the statistic of a random distribution, that is a random variable taking values in a space of probability measures. Such a context is useful when dealing with classes of raw data of a large dataset or with objects having a complex behaviour. We present the theoretical framework, some examples of models, the likelihood for finite dimensional estimators and some recent applications.Aller à la page de la contribution
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Prof. Felix KWOK (Department of Mathematics, Hong Kong Baptist University, Hong Kong felix_kwok@hkbu.edu.hk)11/07/2018 10:00One way to accelerate the numerical solution of a nonlinear elliptic problem is to use nonlinear preconditioning, which replaces the original discretized problem by an equivalent but easier one. In this talk, we discuss how a fixed point iteration for a nonlinear system can be used in combination of Newton's method to yield highly efficient, nonlinearly preconditioned methods. Our starting...Aller à la page de la contribution
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Duc Quang Bui (University Paris 13)11/07/2018 11:15
Parareal method is a numerical method to solve time - evolutional problems in parallel, which uses two propagators: the coarse - fast and inaccurate - and the fine - slow but more accurate. Instead of running the fine propagator on the whole time interval, we divide the time space into small time intervals, where we can run the fine propagator in parallel to obtain the desired solution, with...
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Dr Tien Thinh NGUYEN (Gran Sasso Science Institute, Italy)11/07/2018 11:15Dissipative hyperbolic systems play a central role in many applications including the kinetic models for gas dynamics and the relaxation numerical schemes approximating conservation laws. One important feature of this kind of systems is the diffusion limit of solution as time tends to infinity. In this talk, we will discuss some reasonable dissipative structures such that for large time, the...Aller à la page de la contribution
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Mlle Thi Bao Tram NGO (PhD student)11/07/2018 12:00
We study the Multi-level Monte Carlo method introduced by Giles [3] and its applications to finance which is significantly more efficient than the classical Monte Carlo method. This method for the stochastic differential equations driven by only Brownian Motion had been studied by Ben Alaya and Kebaier [2]. Here, we consider the stochastic differential equation driven by a pure jump Lévy...
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Dr Dang Khoa NGUYEN (Faculty of Mathematics, University of Vienna, Oskar-Morgenstern-Platz 1, 1090 Vienna, Austria)11/07/2018 12:00Proximal operator, since introduced by French mathematician Jean-Jacques Moreau in 1962 [Moreau], became a fundamental object used to design algorithms for nonsmooth optimization. With reference [Attouch-Bolte] as a starting point, proximal-type algorithm for nonconvex model attracts huge interest due to its increasing applications in real world. However, until recently such model cannot...Aller à la page de la contribution
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Prof. Laurence Halpern
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Prof. Fabrice PLANCHON (Laboratoire J. A. Dieudonné, Université Nice Sophia-Antipolis, France.)
We will review recent results on the propagation of waves on domains, with emphasis on two extreme cases: the exterior or the interior of a stricly convex domain. Understanding the wave localization, its amplitude and how it decays is fundamental for several (unrelated) problems and we will describe an interesting interplay between geometrical aspects and degenerate oscillatory integrals that...
Aller à la page de la contribution -
Prof. Jing-Rebecca LI (INRIA Saclay-Equipe DEFI, INRIA, France.)There are many time and space scales in the diffusion MRI modelling problem for biological tissue. In addition, the tissue micro-structure frequently cannot be described with accuracy and certainty. I will talk about the challenges as well as some solution approaches to this problem, in terms of numerical simulations and the formulation of reduced models.Aller à la page de la contribution
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