Network emulation focusing on QoS-Oriented satellite communication

This chapter proposes network emulation basics and a complete case study of QoS-oriented Satellite Communication

Overview of the First Phylogenomics Conference

The First Phylogenomics Conference was held in Ste-Adèle (Québec, Canada) in March 2006. Selected papers appear in this special issue of BMC Evolutionary Biology. Here, we give an introduction to the field and provide an overview of the articles presented in this issue

Efficacité des structures de contrôle et enracinement des dirigeants.

Dans le cadre théorique du gouvernement d'entreprise, cet article étudie l'efficacité du contrôle exercé par la structure de propriété et le conseil d'administration sur les dirigeants. La confrontation des théories de l'enracinement et de l'agence permet de déterminer les conditions nécessaires à l'efficacité des contrôleurs. La structure de propriété et le conseil d'administration réunissent rarement l'ensemble des conditions. Les tests réalisés avec la méthode du bootstrap corroborent les hypothèses de la théorie de l'enracinement et rejettent en partie les arguments de la théorie de l'agence.In the theoretical framework of corporate governance this article studies the efficiency of the control exerted by the ownership structure and the board of directors on managers. The confrontation of entrenchment theory and agency theory allows to determine the necessary conditions of the controller's efficiency. The ownership structure and the board of directors rarely unite all these conditions. Tests realized with the bootstrap method corroborate the entrenchment theory hypotheses and reject partially the arguments of agency theory.gouvernement d'entreprise; théorie de l’agence; théorie de l'enracinement; structure de propriété; conseil d'administration.; corporate governance; agency theory; entrenchment theory; ownership structure; board of directors;

Computing Electronic Structures: a New Multiconfiguration Approach for Excited States

We present a new method for the computation of electronic excited states of molecular systems. This method is based upon a recent theoretical definition of multiconfiguration excited states (due to one of us, see M. Lewin, Solutions of the Multiconfiguration Equations in Quantum Chemistry, Arch. Rat. Mech. Anal. 171 (2004) 83-114). Contrarily to previously used methods, our algorithm always converges to a stationary state of the multiconfiguration model, which can be interpreted as an approximate excited state of the molecule. We also compare our method to other approaches and give some explanation of the unsatisfactory behaviours which are sometimes observed when using the latter. The definition is variational. To compute the first excited state, one has to deform paths on a manifold, like this is usually done in the search for transition states between reactants and products on potential energy surfaces. We propose here a general method for the deformation of paths which could also be useful in other settings. Numerical results for the special case of two-electrons systems are provided. We compute the first singlet excited state potential energy surface of the $H_2$ molecule, and give some numerical results concerning Helium-like atoms