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Expert Systems

Expert Systems. An expert system is a computer program that is designed to hold the accumulated knowledge of one or more domain experts. Applications of Expert Systems. PUFF: Medical system for diagnosis of respiratory conditions. PROSPECTOR:

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Expert Systems

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  1. Expert Systems An expert system is a computer program that is designed to hold the accumulated knowledge of one or more domain experts

  2. Applications of Expert Systems PUFF: Medical system for diagnosis of respiratory conditions PROSPECTOR: Used by geologists to identify sites for drilling or mining

  3. Applications of Expert Systems MYCIN: Medical system for diagnosing blood disorders. First used in 1979 DESIGN ADVISOR: Gives advice to designers of processor chips

  4. Applications of Expert Systems DENDRAL: Used to identify the structure of chemical compounds. First used in 1965 LITHIAN: Gives advice to archaeologists examining stone tools

  5. Components of an Expert System • The knowledge base is the collection of facts and rules which describe all the knowledge about the problem domain • The inference engine is the part of the system that chooses which facts and rules to apply when trying to solve the user’s query • The user interface is the part of the system which takes in the user’s query in a readable form and passes it to the inference engine. It then displays the results to the user.

  6. Why use Expert Systems? • Experts are not always available. An expert system can be used anywhere, any time. • Human experts are not 100% reliable or consistent • Experts may not be good at explaining decisions • Cost effective

  7. Problems with Expert Systems • Limited domain • Systems are not always up to date, and don’t learn • No “common sense” • Experts needed to setup and maintain system

  8. Legal and Ethical Issues • Who is responsible if the advice is wrong? • The user? • The domain expert? • The knowledge engineer? • The programmer of the expert system shell? • The company selling the software?

  9. Expert Systems on the Web • http://www.aiinc.ca/demos/whale.html • http://www.vanguardsw.com/ decisionscript/examples.htm • http://www.exsys.com/demomain.html • http://www.expertise2go.com/webesie/car • http://www.expertise2go.com/webesie/wine

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