1.
Damascus University
Faculty of Information Technology Engineering
Artificial Intelligence Department
Knowledge Based Systems
​Knowledge-Based Systems Homework
02​th​
May 2018
The assignment is to write a medical diagnostic expert system that is
capable of diagnosing one of the following medical situations:
HIV:
● sore throat
● headache
● fever
● rash
Pregnancy:
● fatigue
● vomiting
● lightheadedness
● increased waistline
Flu:
● headache
● fever
● tiredness
● nasal discharge
Your system should function correctly even if the user inputs a synonym of
one of the symptoms. Here is a list of the synonyms that your system should
recognize:

2.
● fever​:​ elevated temperature, hyperthermia, pyrexia.
● headache​:​ pain head, migraine.
● sore throat​:​ pain throat, throat sore.
● fatigue​:​ exhaustion, lethargy, tiredness, weariness.
● vomiting​:​ emesis, stomach upset, upset stomach, nausea.
● passed out​:​ fainting, lightheadedness, syncope, vasovagal.
A typical example​:
The input
Khaled has:
● migraine
● pyrexia
● fatigue
● nasal discharge
The output
● Khaled ​has/is​ ​flu.
After you are done with implementing the above expert system, try the
following:
The input
Khaled has:
● headache
● vomiting
● lightheadedness
● increased waistline

3.
Your system will respond by saying: "​Khaled​ has/is pregnant." Even if ​Khaled
has all these symptoms, obviously he cannot be pregnant. What do you
need to add to your expert system to avoid this problem?
Eng. Ahmad Hussein
ahmadhussein.ah7@gmail.com