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Reasoning with vague default

✍ Scribed by Swapan Raha; Kumar S. Ray

Publisher: Elsevier Science
Year: 1997
Tongue: English
Weight: 849 KB
Volume: 91
Category: Article
ISSN: 0165-0114
DOI: 10.1016/s0165-0114(96)00152-2

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✦ Synopsis

Motivated by the recognized inadequacy of conventional techniques for the representation and manipulation of defaults which allow vague concepts as well, in this paper we present a theoretical study of an approach to default reasoning with vague default based on fuzzy logic. Zadeh's theory of possibility is used as a framework for modelling default rule incorporated with vagueness. In our approach we have attempted to represent a vague default value as a vague statement augmented with partial truth. Such a logical proposition may hold true to some degree. The truth values are qualitative and are possibly infinite in number. For reasoning with vague default we have considered a similarity based approach. A new concept of similarity index has been developed. Simple, yet concrete, examples have been considered to illustrate the proposed model.

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