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

Pannarat Guayjarernpanishk
Faculty of Interdisciplinary Studies, Nong Khai Campus, Khon Kaen University, Nong Khai
Thailand

Prapawan Senapeng
Department of Mathematics, Faculty of Science, Mahasarakham University, Maha Sarakham
Thailand

Piyapatr Busababodhin
Department of Mathematics, Faculty of Science, Mahasarakham University, Maha Sarakham
Thailand