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Ch3 662 : Rule based (Rule (IF-THEN structure that relate facts in IF part…
Ch3 662 : Rule based
Knowledge
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Domain expert
- is someone who has deep understanding (facts and rules) and have practical experience in a particular domain
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Rule-based expert system
- Knowledge base (IF-THEN)
- Database (Facts)
- Inference engine
- Explanation facility
- User interface
- User
Setiap satu ni pun ada explanation dia...
Characteristics
Built to perform a human level in a narrow, specialized domain and high-quality performance
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Inference Chaining
Forward Chaining
- Data driven reasoning
- Start from know data and proceed forward with that data
- Blablablablabla
Backward Chaining
- Goal driven reasoning
- Blablablablabla
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Conflict Resolution
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To solve this...
- Fire rule with highest priority
We need to place the rule in appropriate order
- Fire the most specific rule
Also know as the longest matching strategy.
It is based on the assumption that a specific rule process more information than a general one
Meta-knowledge
- Knowledge about knowledge
- Knowledge about the use & control of domain knowledge in expert system
In rule based, it represent metarules. Metarules is the strategy for the use of task specific rules in the expert system
Metarule 1
- Rules supplied by experts have more priority than rules supplied by novices
Metarule 2
- Rules that cover human lives has more priority than rules about clearing overload on system equipment
