RESEARCH PAPERS: Design Theory and Methodology

Knowledge Representation and Conversion for Hybrid Expert Systems

[+] Author and Article Information
T. L. Chambers

Department of Mechanical Engineering, University of Southwestern Louisiana, Lafayette, Louisiana

A. R. Parkinson

Department of Mechanical Engineering, Brigham Young University, Provo, Utah

J. Mech. Des 120(3), 468-474 (Sep 01, 1998) (7 pages) doi:10.1115/1.2829175 History: Received July 01, 1996; Revised May 01, 1998; Online December 11, 2007


Many different knowledge representations, such as rules and frames, have been proposed for use with engineering expert systems. Every knowledge representation has certain inherent strengths and weaknesses. A knowledge engineer can exploit the advantages, and avoid the pitfalls, of different common knowledge representations if the knowledge can be mapped from one representation to another as needed. This paper derives the mappings between rules, logic diagrams, decision tables and decision trees using the calculus of truth-functional logic. The mappings for frames have also been derived by Chambers and Parkinson (1995). The logical mappings between these representations are illustrated through a simple example, the limitations of the technique are discussed, and the utility of the technique for the rapid-prototyping and validation of engineering expert systems is introduced. The technique is then applied to three engineering applications, showing great improvements in the resulting knowledge base.

Copyright © 1998 by The American Society of Mechanical Engineers
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