Expert Systems Higher Information Systems

Expert Systems

1. Catagories

   • Advice
   • Classification
   • Diagnosis
   • Planning

2. Components

   • Knoledge Base
   • Inference Engine
   • User Interface

3. Expert System Shell

   • User Interface
   • Inference Engine

4. Personnel

   • Domain Expert
   • Knoledge Engineer
   • Programmer
   • User

5. Deductive Database

   • Combines features of an expert system and database
   • Makes deductions based on stored facts and rules

6. Knowledge

   • The result of applying reasoning to information
   • Expert systems are knowledge based systems

7. Knowledge Representation

   • Forward Rules
   • Backwards Rules
   • Factor Table
   • Decision Tree

8. Logic

   • Propositional
     • Deals with satements which are either true or false
     • S^¬F > G
   • Predicate
     • ∀x:dog(x) > can_bark(x)

9. Conflict Resolution Stratagies

   • Rule Ordering
   • Recency
   • Specificity
   • Refractoriness
   • Data Ordering
   • Context Limiting

10. RETE Algorithm

    • Quickly identifies rules which have been added or removed from the conflict set