1. Associate Professor, Faculty of Mechanical Engineering, GIK Institute of Engineering Sciences and Technology, Topi, NWFP, Pakistan (corresponding author).
2. MS Student, Faculty of Mechanical Engineering, GIK Institute of Engineering Sciences and Technology, Topi, NWFP, Pakistan.
3. Reader and Vice Dean, Resources and Planning, Dept. of Mechanical Engineering, Univ. of Strathclyde, Glasgow, U.K.