The Journal of King Mongkut's University of Technology North Bangkok
วารสารวิชาการพระจอมเกล้าพระนครเหนือ

Phanuphon Siriwithtayathanakun
Department of Teacher Training in Electrical Engineering, Faculty of Technical Education, King Mongkut’s University of Technology, North Bangkok.
Thailand

Pichet Sriyanyong
<p>Department of Teacher Training in Electrical Engineering, Faculty of Technical Education, King Mongkut’s University of<br />Technology North Bangkok, Bangkok</p>
Thailand