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La modélisation de la cognition dans l'élaboration d'un système expert

Abstract : This thesis deals with the problem of cognition modelisation when elaborating a decision aiding expert system in the field of life-insurance. We intend to show that this modelisation can be seen as the design of a functional architecture based on the expert's concepts and reasonings. This architecture consists into a "programmable" circuit in which knowledge is organized in two complementary ways. On the first hand concepts are gathered into categories, which cover the various topics of insurance medecine. In each category, concepts are ordered into classes and classes instances and related to each other through subordination or conceptual dependency relations. On the second hand, the expert reasonings are represented by production rules and inference schemes, whose activation tries to simulate respectively the diagnostic and pronostic activities of the human expert. Therefore, the decision making process can be considered as an activation process of the circuit made up of the concepts categorization, the production rules and the inference schemes. The circuit activation is based on the constant search of the most relevant pieces of knowledge, and seeks to trigger inferences allowed for given logical, syntactical and semantical contents of the knowledge in the different places of the circuit. This particular knowledge with logical, syntactical and semantical contents at once, is called "cognitive operators". Finally, we sought to validate our model by comparing the expert system answers with those of three experts. It appeared that the decisions made by the expert system and the explanation given are considered globally acceptable by the human experts
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  • HAL Id : tel-01775917, version 1



Eric Brangier. La modélisation de la cognition dans l'élaboration d'un système expert. Psychologie. Université Paul Verlaine - Metz, 1991. Français. ⟨NNT : 1991METZ001L⟩. ⟨tel-01775917⟩



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