Backward-Chaining Rule-Based Systems. Elnaz Nouri December 2007. Chapter 7 overview:. Introduction Medical consultation systems Example 1:Meningitis Diagnosis Expert System Example 2:Meningitis Prescription Expert System Example 3:Alternative Prescription Expert System
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Prove or disprove “Infection is meningitis”
This can be proven if the user already knows that the patient has meningitis or the system can infer it.
SYSTEM: “After considering your info, I believe the infection is Menningitis.”
- The rules are shown in next slide.
- We have one goal to prove :
“Prescription is ? Prescription”
GOAL : Determine proper series of drugs
SYSTEM : “My first recommendation is this :
Ampicillin --- Dose : 3.8 g
Gentamicin --- Dose : 131 mg ”
SYSTEM : To drive goal ”Prescription is ? Prescription” I considered:
-RULE1(1.1 is known to be true)
-To drive 1.2 I considered RULE3
-To drive 3.1 I asked you. your answer was 8.
-RULE 3 was concluded.
-RULE 1 was concluded.
- Using existing knowledge
- Using general knowledge
- Determine problem area
- Determine specific fault
USER: won’t start
USER: does turn
USER: normally but won’t start
USER: does move
USER: star occasionally
The specific problem is DIRTY CARBURETOR.
My recommendation is REBUILD THE CARBURETOR.
The cost for such repair is 100 dollars.