First Author:   Ahmed Salem AL-ERAQI Research Operation and Simulation alerqi@cs.usm.my   School of Computer Sciences, Universiti Sains Malaysia, Gelugor George Town, 11800, Malaysia   60164920696/125949367(Phone) 60164920696/125949367(Fax) http://e-office.cs.usm.my/ai/staff.php?stf=10