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ESAIM: Proceedings 17 (2007) 50-66
On the control of ill-posed distributed parameter systems
René Dorville ( ) 1, 2, Ousseynou Nakoulima 1, 2, Abdennebi Omrane 1, 2
(04/2007)

We show that the so-called low-regret (or least-regret) control by J. L. Lions [8] fits on the control of ill-posed problems. At each time, we give the characterization of the so-called no-regret control by means of singular optimality systems. For the backward heat ill-posed problem, no Slater hypothesis is assumed on the admissible set of controls ${{\cal U}_{\mbox{\tiny ad}}}$. This work is two pieces, and two methods are considered : the regularization method and the null-controllability method. For the first method, a zero order corrector is used, while for the second method, the passage to the limit is easy. The results presented here generalize the works in [2,3] to the no-regret control.
1 :  Centre de Recherche en Economie, Gestion, Modélisation et Informatique Appliquée (CEREGMIA)
Université des Antilles et de la Guyane
2 :  Analyse Optimisation Controle (AOC)
Université des Antilles et de la Guyane
Mathématiques/Systèmes dynamiques
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