Lothar Reichel ( Kent University, USA) vendredi 29 mai , salle B014 à 11h00 Titre: ------ Generalized Cross Validation for Tikhonov Regularization of Large-Scale Problems Résumé: ------- Generalized Cross Validation (GCV) is a popular approach to determining the regularization parameter in Tikhonov regularization. The regularization parameter is chosen by minimizing an expression, which is easy to evaluate for small-scale problems, but prohibitively expensive to compute for large-scale ones. We describe a novel method, based on Gauss-type quadrature, for determining upper and lower bounds for the desired expression. These bounds are used to determine the regularization parameter for large-scale problems. This talk presents joint work with Caterina Fenu and Giuseppe Rodriguez.