a Institute for Innovative Learning, Mahidol University, 999, Phuttamonthon 4 Road, Salaya, Nakorn Pathom 73170, Thailand
b Department of Information and Learning Technology, National University of Tainan 33, Sec. 2, Shulin St., Tainan city 70005, ROC, Taiwan
c Department of Physics, Faculty of Science, Mahidol University, Rama VI, Bangkok 10400, Thailand