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, Pathum Thani
Thailand

Kittima Dangsupa
Department of Mathematics and Statistics, Faculty of Science and Technology, Thammasat University, Pathum Thani
Thailand