We consider a class of eigenvalue problems involving coefficients changing sign on the domain of interest. We describe the main spectral properties of these problems according to the features of the coefficients. Then, under some assumptions on the mesh, we explain how one can use classical finite element methods to approximate the spectrum as well as the eigenfunctions while avoiding spurious ...

This paper is concerned with the links between the Value Iteration algorithm and the Rolling Horizon procedure, for solving problems of stochastic optimal control under the long-run average criterion, in Markov Decision Processes with finite state and action spaces. We review conditions of the literature which imply the geometric convergence of Value Iteration to the optimal value. Aperiodicity...

In this analysis, a semi-distributed conceptual runoff model was applied in five basins varying in area between 43 and 195 km, lying in different physiographic regions of Switzerland (lowland, alpine, heavily glaciated high alpine basins) representing various runoff regimes. An objective, labour-intensive optimization procedure was developed and found suitable for deriving optimal parameter val...

An algorithm is described that was initially developed as a simple method for patching and extending observed time series of daily streamflow. It is based on the use of 1-day flow duration curves for each month of the year and on the assumption that flows occurring simultaneously at sites in reasonably close proximity to each other correspond to similar percentage points on their respective dur...

This report focuses on improving the stability as well as the approximation properties of Reduced Order Models (ROM) based on Proper Orthogonal Decomposition (POD). The ROM is obtained by seeking a solution belonging to the POD subspace and that at the same time minimizes the Navier-Stokes residuals. We propose a modified ROM that directly incorporates the pressure term in the model. The ROM is...

This paper examines the dynamic dependence between American and four developed stock markets, namely, Japan, United Kingdom, Germany and France during a recent period including the global …nancial crisis 2007-2009. The econometric approach is based on the extreme-value time-varying copula functions. Speci…cally, the marginal distributions are reproduced by an extreme-value based model while the...

Dans cet article, nous proposons d’explorer, à travers leurs témoignages, des expériences de parents entendants d’enfants sourds face aux multiples normes et discours la norme auxquels ils ont pu être confrontés. Normes médicales d’un côté, conjuguant certaines valeurs autour langue, communication culture, sourdes autre qui exposent imposent parfois aussi visions ce que doit communication, l’éd...