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Article Dans Une Revue IEEE Transactions on Fuzzy Systems Année : 2003

Qualitative reasoning based on fuzzy relative orders of magnitude

Résumé

This paper proposes a fuzzy set-based approach for handling relative orders of magnitude stated in terms of closeness and negligibility relations. At the semantic level, these relations are represented by means of fuzzy relations controlled by tolerance parameters. A set of sound inference rules, involving the tolerance parameters, is provided, in full accordance with the combination/projection principle underlying the approximate reasening method of Zadeh. These rules ensure a local propagation of Cizzy closeness and negligibility relations. A numerical semantics is then attached to the symbolic computation process. Required properties of the tolerance parameter are investigated, in order to preserve the validity of the produced conclusions. The effect of the chaining of rules in the inférence process can be controlled through the gradual deterioration of closeness and negligibility relations involved in the produced conclusions. Finally, qualitative reasoning based on fuzzy closeness and negligibility relations is used for simplifying equations and solving them in an approximate way, as often done by engineers who reason about a mathematical model. The problem of handling qualitative probabilities in reasoning under uncertainty is also investigated in this perspective.

Dates et versions

hal-03370933 , version 1 (08-10-2021)

Identifiants

Citer

Allel Hadjali, Didier Dubois, Henri Prade. Qualitative reasoning based on fuzzy relative orders of magnitude. IEEE Transactions on Fuzzy Systems, 2003, 11 (1), pp.9-23. ⟨10.1109/TFUZZ.2002.806313⟩. ⟨hal-03370933⟩
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