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Expert Systems PowerPoint PPT Presentation


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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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Expert systems l.jpg

Expert Systems

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


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Applications of Expert Systems

PUFF:

Medical system for diagnosis of respiratory conditions

PROSPECTOR:

Used by geologists to identify sites for drilling or mining


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Applications of Expert Systems

MYCIN:

Medical system for diagnosing blood disorders. First used in 1979

DESIGN ADVISOR:

Gives advice to designers of processor chips


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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


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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.


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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


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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


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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?


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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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