1. King Mongkut’s University of Technology North Bangkok,Faculty of Technical Education,Department of Teacher Training in Electrical Engineering,Bangkok,Thailand,10800
2. King Mongkut’s University of Technology North Bangkok,Faculty of Applied Science,Department of Industrial Physics and Medical Instrumentation,Bangkok,Thailand,10800
3. Suranaree University of Technology,Institute of Engineering, School of Telecommunication Engineering,Nakhon Ratchasima,Thailand
4. King Mongkut’s University of Technology North Bangkok,Faculty of Engineering,Department of Electrical and Computer Engineering,Bangkok,Thailand,10800