1. Doctoral Student, Dept. of Mechanical Engineering, Univ. Technologi Petronas, 30200 Perak, Malaysia.
2. Assistant Professor, Dept. of Mechanical Engineering, Univ. of Tabuk, Tabuk, Saudi Arabia 3477 (corresponding author).
3. R&D Chief, Quality Assurance & Technology Development Dept., Southern Steel Bhd, Prai Industrial Estate, 11300 Penang, Malaysia.
4. Associate Professor, Dept. of Mechanical Engineering, Univ. Technologi Petronas, 30200 Perak, Malaysia.