1. Rajamangala University of Technology Rattanakosin,School of Electrical Engineering,Nakhon Pathom,Thailand
2. Rajamangala University of Technology Suvarnabhumi,Faculty of Engineering and Architecture,School of Electrical Engineering,Nonthaburi,Thailand
3. Suranaree University of Technology,Institute of Engineering,School of Electrical Engineering,Nakhon Ratchasima,Thailand