Rule-Based Expert System

Knowledge 

In order for intelligent machine could solve the problem so that the engine must have knowledge. Knowledge can be obtained from:  
Past experience   
 From expert (Expert)  
 From the data stored in the database (using data mining techniques)
 
Knowledge is:  
 understanding someone either in theory or practice of a domain (specific bidang2)
 Everything we know it today or apa2 who we remember today  
 Knowledge is power someone (people who have called expert)  

Expert:  
 Any person who has extensive knowledge of a domain

Questions People : 
Manager 
= What can I use?  

Technology 
= How can I implement with good? 

Researcher 
= How can I develop? 

Customer / User 
= How can this help? = Is good enough find solution problems and save money? = How constraints?


 
Expert System is:  
One branch of AI that makes widespread use of specific knowledge to solve human problems that expert level
Human Expert is: 
People who have expertise in certain fields, experts who have knowledge or special abilities that other people do not know or capable in the field has.

How to repsentasikan knowledge to make an intelligent machine or a specialist? Knowledge is transformed into a form of rule / production rule 

ex:  
We want to help aliens to cross the street where we are expert in crossing street And the knowledge we have is:  
- If traffic lights are green street action (go) 
 - If a red traffic light the action stop (stop)
 
Rule no 2 (two) parts: 
  part IF (condition) 
  THEN part (action) 

Thus, knowledge on converted / represented in the form of rule, the rule: 
  IF the traffic light is green THEN the action is go 
  IF the traffic light is red THEN the action is stop
                                                       
General syntax of a rule: 
  IF <condition>  
 THEN <action> 
Other names:  
 Condition / antecedent  
 Action / consequent 
Antecedent consists of 2 (two) parts:  
 Object 
 Value
                                                       

General syntax of a rule:  
IF <antecedent>  
THEN <consequent>  

Combination rule: AND IF <antecedent 1> <antecedent <antecedent n> 2> ... THEN <consequent>  
OR IF <antecedent 1> <antecedent <antecedent n> 2> ... THEN <consequent>
                                                       

According to Durkin, 1994, that rule can be represented in the form:  
 Relation  
 Recommendations  
 Directive 
 Strategy  
 Heuristic

Example: