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

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

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