Intro Expert Systems


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Intro Expert Systems

  1. 1. Title: Expert Systems Presentation By Suresh Pakala 06M21A0556
  2. 2. Expert Systems An expert system is a computer program that is designed to hold the accumulated knowledge of one or more domain experts
  3. 3. Expert System Functionality <ul><ul><li>assist human expert when integrating various decisions </li></ul></ul><ul><ul><li>replace human expert decision making when not available </li></ul></ul><ul><li>expert systems : programming computers to make decisions in real-life situations (for example, some expert systems help doctors diagnose diseases based on symptoms) </li></ul>
  4. 4. Applications of Expert Systems PROSPECTOR: Used by geologists to identify sites for drilling or mining PUFF: Medical system for diagnosis of respiratory conditions
  5. 5. Applications of Expert Systems DESIGN ADVISOR: Gives advice to designers of processor chips MYCIN: Medical system for diagnosing blood disorders. First used in 1979
  6. 6. 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
  7. 7. Components of an Expert System <ul><ul><li>The knowledge base is the collection of facts and rules which describe all the knowledge about the problem domain </li></ul></ul><ul><ul><li>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 </li></ul></ul><ul><ul><li>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. </li></ul></ul>
  8. 8. Why use Expert Systems? <ul><ul><li>Experts are not always available. An expert system can be used anywhere, any time. </li></ul></ul><ul><ul><li>Human experts are not 100% reliable or consistent </li></ul></ul><ul><ul><li>Experts may not be good at explaining decisions </li></ul></ul><ul><ul><li>Cost effective </li></ul></ul>
  9. 9. Problems with Expert Systems <ul><ul><li>Limited domain </li></ul></ul><ul><ul><li>Systems are not always up to date, and don’t learn </li></ul></ul><ul><ul><li>No “common sense” </li></ul></ul><ul><ul><li>Experts needed to setup and maintain system </li></ul></ul>
  10. 10. Legal and Ethical Issues <ul><ul><li>Who is responsible if the advice is wrong? </li></ul></ul><ul><ul><ul><li>The user? </li></ul></ul></ul><ul><ul><ul><li>The domain expert? </li></ul></ul></ul><ul><ul><ul><li>The knowledge engineer? </li></ul></ul></ul><ul><ul><ul><li>The programmer of the expert system shell? </li></ul></ul></ul><ul><ul><ul><li>The company selling the software? </li></ul></ul></ul>
  11. 11. Expert Systems on the Web <ul><ul><li> </li></ul></ul><ul><ul><li> decisionscript/examples.htm </li></ul></ul><ul><ul><li> </li></ul></ul><ul><ul><li> </li></ul></ul><ul><ul><li> </li></ul></ul>
  12. 12. Limitations of Expert Systems <ul><ul><li>Not widely used or tested </li></ul></ul><ul><ul><li>Limited to relatively narrow problems </li></ul></ul><ul><ul><li>Cannot readily deal with “mixed” knowledge </li></ul></ul><ul><ul><li>Possibility of error </li></ul></ul><ul><ul><li>Cannot refine own knowledge base </li></ul></ul><ul><ul><li>Difficult to maintain </li></ul></ul><ul><ul><li>May have high development costs </li></ul></ul><ul><ul><li>Raise legal and ethical concerns </li></ul></ul>
  13. 13. Any Queries ?