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

Pongsakorn Chanchaichujit
Department of Mechanical Engineering, Faculty of Engineering, Prince of Songkla University, Songkhla
Thailand

Pruittikorn Smithmaitrie
Department of Mechanical Engineering, Faculty of Engineering, Prince of Songkla University, Songkhla
Thailand

Mechanical Engineering Department, 

Faculty of Engineering,

Prince of Songkla University,

Hat Yai, Songkhla, 90112