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Artificial Intelligence and Soft Computing: Behavioral ... - Arteimi.info

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10<br />

Structured Approach<br />

to Fuzzy Reasoning<br />

Reasoning in expert systems in the presence of imprecision <strong>and</strong> inconsistency<br />

of the database <strong>and</strong> uncertainty of a knowledge base, is itself a complex<br />

problem, <strong>and</strong> becomes intractable when the knowledge base has an explicit<br />

self-reference to itself. A self-referential knowledge base, if instantiated with<br />

appropriate data elements, gives rise to formation of cycles in the reasoning<br />

space. The chapter presents a structured approach to fuzzy reasoning using<br />

Petri nets to h<strong>and</strong>le all the above problems of inexactness of data <strong>and</strong><br />

knowledge by a unified approach.<br />

A structural analysis of the model has been undertaken to examine its<br />

properties with respect to 'reachability of places' in the network for<br />

subsequent applications in the detection of cycles. A behavioral analysis of<br />

the model, with special reference to stability, reciprocity <strong>and</strong> duality, has also<br />

been presented. The results of the above analysis have been applied to fuzzy<br />

reasoning of a diverse nature including Modus Ponens, Modus Tollens,<br />

Abduction <strong>and</strong> non-monotonism.

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