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

Patchanok Srisuradetchai
Department of Mathematics and Statistics, Faculty of Science and Technology, Thammasat University, Rangsit Campus,Pathum-Thani
Thailand

Kittanan Tonprasongrat
Department of Mathematics and Statistics, Faculty of Science and Technology, Thammasat University, Rangsit Campus, Pathum-Thani
Thailand