1. Department of Electrical Engineering, Rajamangala University of Technology Tawan-Ok, Chanthaburi Campus, Chanthaburi, Thailand
2. School of International and Interdisciplinary Engineering, Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok, Thailand
3. School of Electrical Engineering, Suranaree University of Technology, Nakhon Ratchasima, Thailand