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An experiment in the design of modular expert systems with special reference to fault diagnosis


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Coleman, James P H 1989 , 'An experiment in the design of modular expert systems with special reference to fault diagnosis', Research Master thesis, University of Tasmania.

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A method for dealing with three of the major problems in hybrid rule-based expert
systems is proposed. They are; the problem of managing the complexity of the
knowledge base, the problem of graceful degradation and the problem of the logics used
to manipulate the rules, which do not fit easily with human expertise. An experimental
expert system, Aristotle, is developed in which modules are used as a tool to reduce
complexity. Modules group related rules together into components, which interact with
the outside world through parameters. The module also provides a suitably sized object
on which extra (partial) knowledge can be attached. It is proposed to use partial
knowledge to reason, at a general level, about components and groups of components,
giving the appearance of a knowledge base, which degrades gracefully. A five-value
logic is introduced with the extra logic values irrelevant, do-not-know and unknown.
This logic is able to reason about unusual situations without having to explicitly check
for them. This thesis demonstrates, that modules, partial rules and the five-value logic,
can overcome, to an extent, the problems mentioned earlier.

Item Type: Thesis - Research Master
Authors/Creators:Coleman, James P H
Keywords: Expert systems (Computer science)
Copyright Holders: The Author
Copyright Information:

Copyright 1989 the Author - The University is continuing to endeavour to trace the copyright
owner(s) and in the meantime this item has been reproduced here in good faith. We
would be pleased to hear from the copyright owner(s).

Additional Information:

Thesis (M.Sc.)--University of Tasmania, 1990. Includes bibliography

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