1. Department of Petroleum and Chemical Engineering, College of Engineering, Sultan Qaboos University, Al Khod, Muscat 123, Oman
2. School of Computing, University of Leeds, Sir William Henry Bragg Building, Woodhouse Lane, Leeds LS2 9JT, United Kingdom
3. University of Technology and Applied Sciences PO Box 74, Al-Khuwair, Muscat 133, Oman