Michel De Lara

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For a sequence of dynamic optimization problems, we aim at discussing a notion of consistency over time. This notion can be informally introduced as follows. At the very first time step t 0 , the decision maker formulates an optimization problem that yields optimal decision rules for all the forthcoming time step t 0 , t 1 ,. .. , T ; at the next time step(More)
In stochastic optimal control, a key issue is the fact that " solutions " are searched for in terms of " feedback " over available information and, as a consequence, a major potential difficulty is the fact that present control may affect future available information. This is known as the " dual effect " of control. Given a minimal framework (that is, an(More)
Like many marine organisms, most coral reef fishes have a dispersive larval phase. The fate of this phase is of great concern for their ecology as it may determine population demography and connectivity. As direct study of the larval phase is difficult, we tackle the question of dispersion from an opposite point of view and study self-recruitment. In this(More)
The World Summit on Sustainable Development (Johannesburg, 2002) encouraged the application of the ecosystem approach by 2010. However, at the same Summit, the signatory States undertook to restore and exploit their stocks at maximum sustainable yield (MSY), a concept and practice without ecosystemic dimension, since MSY is computed species by species, on(More)
Motivated by the numerical resolution of stochastic optimization problems subject to measurability constraints, we focus upon the issue of how to discretize the components arising in the problem formulation. By means of a counterexample based on Monte Carlo approximation, we emphasize the importance of independent discretization of, on the one side, the(More)