1. Faculty of Electrical and Electronic Engineering, Universiti Tun Hussein Onn Malaysia, 86400 Parit Raja, Batu Pahat, Johor, Malaysia
2. Department of Mechanical Engineering, Toyohashi University of Technology, Hibari Gaoka 1-1, Tenpaku, Toyohashi, Aichi 441-8580 Japan
3. Faculty of Mechanical Engineering, Universiti Tun Hussein Onn Malaysia, 86400 Parit Raja, Batu Pahat, Johor, Malaysia
4. Osaka Municipal Technical Research Institute, 1-6-50, Morinomiya, Joto-ku, Osaka 536-8553, Japan