Pannarat Guayjarernpanishk
Faculty of Interdisciplinary Studies, Nong Khai Campus, Khon Kaen University, Nong Khai 43000,
Thailand

Nipaporn Chutiman
Department of Mathematics, Faculty of Science, Mahasarakham University, Maha Sarakham 44150,
Thailand

Narumol Piwpuan
Faculty of Interdisciplinary Studies, Nong Khai Campus, Khon Kaen University, Nong Khai 43000,
Thailand

Butsakorn Kong-ied
Department of Mathematics, Faculty of Science, Mahasarakham University, Maha Sarakham 44150,
Thailand

Monchaya Chiangpradit
Department of Mathematics, Faculty of Science, Mahasarakham University, Maha Sarakham 44150,
Thailand