1. Instructor, Dept. of Information and Computer Science, King Fahd Univ. of Petroleum and Minerals, Dhahran 31261, Saudi Arabia. E-mail: mbalah@kfupm.edu.sa
2. Associate Professor, Dept. of Civil Engineering, King Fahd Univ. of Petroleum and Minerals, Dhahran 31261, Saudi Arabia (corresponding author). E-mail: hghamdi@kfupm.edu.sa