Raisonnement à partir de cas et classification hiérarchique : application à la planification de synthèse en chimie organique

Abstract : This thesis describes an approach to case-based reasoning based on hierarchical classification. A case consists of a problem and a solution to this problem. Case-based reasoning consists in exploiting a case base in order to solve a problem called the target problem. In the framework of this thesis, such a reasoning takes two main steps: retrieval and adaptation. Retrieval consists in searching the case base for a case similar to the target problem. Adaptation uses the retrieved case in order to build up a solution to the target problem. The case base is organised in a hierarchy. Retrieval is performed by a "strong" classification step followed -if needed- by a "smooth" classification step. Strong classification consists in searching in the case base hierarchy for a case more general than the target problem, i.e. a generic case the solution of which can be specialised into a solution of the target problem. If this search succeeds, the adaptation of such a case can be performed by specialised of the generic case found. Otherwise, the role of smooth classification is to make sorne modifications on the cases of the hierarchy and on the target problem within the objective of having one of these modified cases more general than the modified target problem. Then the adaptation step takes these modifications into account. The application of this thesis takes place in the domain of planning in organic synthesis. In this application, a problem is given by a molecule and a solution is a synthesis plan, Le. the description of a chemical method for building up a molecule.
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Theses
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http://docnum.univ-lorraine.fr/prive/SCD_T_1997_0215_LIEBER.pdf
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https://hal.univ-lorraine.fr/tel-01747358
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Submitted on : Thursday, March 29, 2018 - 10:57:54 AM
Last modification on : Friday, May 24, 2019 - 10:56:18 AM

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Jean Lieber. Raisonnement à partir de cas et classification hiérarchique : application à la planification de synthèse en chimie organique. Autre [cs.OH]. Université Henri Poincaré - Nancy 1, 1997. Français. ⟨NNT : 1997NAN10215⟩. ⟨tel-01747358⟩

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