Sistem Pakar (Pertemuan 4)

Dosen : Titik Lusiani 

Sistem Berbasis Aturan (Backward Reasoning)

     Mekanisme inferensi pada backward reasoning berbeda dengan forward reasoning. Walaupun kedua proses melibatkan pengujian terhadap masing-masing rule, backward reasoning mulai dari konklusi yang diharapkan menuju fakta-fakta yang mendukung konklusi tersebut.

Contoh Kasus : Kasus Beverage and Main Course Identification.

Perhatikan rule di bawah ini:

Parameter-parameter yang digunakan adalah:

-  guest-age: positive integer between 15 and 100

-  alcohol-indicated: yes/no

-  meal: formal/informal

-  drink: wine/beer/soda

-  guest: boss/neighbor/friend

-  dinner: fish/veal/read-meat/pultry/pizza

-  day: moday/tuesday/ . . . /sunday

Sistem dimulai dengan Known Fact Base: ()

Misalnya goal yang diharapkan adalah: Goals (drink wine-type dinner)

Tentukan hasil akhir dari database jika saat ini adalah Tuesday, kita mengundang neighbor berumur 30 th untuk casual meal.

R1 If guest-age < 21 Then alcohol-indecated = no

R2 If guest-age ≥ 21 Then alcohol-indecated = yes

R3 If alcohol-indecated = yes AND meal = formal Then drink = wine

R4 If alcohol-indecated = yes AND guest = boss Then drink = wine

R5 If alcohol-indecated = yes AND guest = neighbor Then drink = beer

R6 If drink = wine AND dinner = fish Then wine-type = white

R7 If drink = wine AND dinner = red-meat Then wine-type = red

R8 If guest = boss AND day = Friday Then dinner = fish

R9 If guest = boss AND day <> Friday Then dinner = red-meat

R10 If guest-age < 21 Then dinner = pizza

R11 If guest-age ≥ 21 Then dinner = fish

R12 If alcohol not indicated Then drink = soda

Sumber :

http://blog.stikom.edu/lusiani/sistem-pakar/pertemuan-3-4/