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Theses

Évaluation de l’effectivité des systèmes ambiants

Abstract : From a closed and controlled environment, neglecting all the external disturbances, information processing is now exposed to the complexity and the hazards of the physical environment, open and uncontrolled. Indeed, as a result of the progresses made on wireless communications, energy storage and the miniaturization of computer components, the fusion of the physical and digital worlds is a reality embodied in so-called ambient systems. At the heart of these systems, everyday objects are transcended by computer and electronic information processing means (actuators, sensors, processors, etc.) offering new perspectives of interactions between the physical and digital worlds.This evolution, however, calls for an epistemological break. Being complex by their fusion with the physical environment, it is no longer a matter of predicting in silico the behavior of such systems from models established on the basis of a knowledge supposed to be complete and reliable. On the contrary, aware of the intrinsic complexity of these systems and the inability to obtain a reliable model, it is necessary to ensure their effectiveness in vivo. Indeed, without a reliable model of these systems on which to build control laws, their behavior is likely to drift until it no longer produces the expected effects.This thesis proposes to provide a solution to this problem on the basis of a methodological approach based on the systemic principles. As a result of this approach, the systemic model of an ambient system answers the question “what does the ambient system have to do?”. From this model and the observation of the effects produced in the environment, the notion of effectiveness is then formalized within the framework of the measure theory. A set of measures is applied to this formalization (probabilities, possibilities and belief functions in the framework of the transferable belief model) and the results are discussed.The results of this work are opening up numerous perspectives. In the context of agile software development methods for ambient systems, the evaluation of effectiveness can be part of a continuous testing process. In the case of self-adaptive systems, it can be used as an indicator of reward, error, etc. In the case where the systemic model represents the preferred behavior of an ambient system, the evaluation of the effectiveness is like an indicator of the quality of the user experience interacting with the system.
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Gérald Rocher. Évaluation de l’effectivité des systèmes ambiants. Informatique ubiquitaire. Université Côte d'Azur, 2020. Français. ⟨NNT : 2020COAZ4003⟩. ⟨tel-03000573⟩

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