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Theses

Couplage de modèles multi-niveau de systèmes complexes : application aux systèmes biologiques

Abstract : The objective of this thesis is to propose an approach for coupling metabolic and ecological levels in a complex biological system. This approach is presented as formal model describing the organism metabolism , which, thanks to DEVS formalism (Discrete Event System Specification), allows a coupling with models of interaction between organisms and between organisms and their environment. A study of the different modeling paradigms allowed us to identify, on the one hand the appropriate paradigm for each level and on the other hand the coupling factors formed by the variables at the interface of individual's internal and external worlds. This coupling explores the effect of lower-level dynamics on the emergence of higher-level characteristics. Two multiagent models, the first on sexual allocation and the second on optimal foraging, concretize the physiology/ecology coupling and show that this coupling makes it possible to connect the individual's internal world with its external world. The strong coupling, in the sense of model integration, explored in a first phase, was improved by the proposal of a formal model, called DEB-DEVS, of the metabolic model (of the Dynamic Energy Budget Theory (DEB)) common to the previous models. This proposal is the result of a reflection on the representation of internal dynamics of agents in ecological models. DEB-DEVS has been illustrated by two classical models of theoretical ecology.
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Dorra Louati. Couplage de modèles multi-niveau de systèmes complexes : application aux systèmes biologiques. Modélisation et simulation. Université Pierre et Marie Curie - Paris VI; École Nationale des Sciences de l'Informatique (La Manouba, Tunisie), 2017. Français. ⟨NNT : 2017PA066630⟩. ⟨tel-01996580⟩

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