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

Supaporn Saduakdee
Program of Mathematics, Faculty of Science, Chandrakasem Rajabhat University, Bangkok
Thailand

Pornjira Intanuoy
Program of Mathematics, Faculty of Science, Chandrakasem Rajabhat University, Bangkok
Thailand

Natchaya Yod-on
Program of Mathematics, Faculty of Science, Chandrakasem Rajabhat University, Bangkok
Thailand