Assoc.Prof.Dr. Apiwan Manimmanakorn email: mapiwa@kku.ac.th Asst.Prof.Dr. Orathai Tunkamnerdthai email: torata@kku.ac.th Asst.Prof.Dr.Kurusart Konharn email: kuruko@kku.ac.th
Graduate School Khon Kaen University Contact Address: 3rd Floor, Bimala Kalakicha Building, Khon Kaen University, 40002, Thailand. Tel: (+66)-43-202420 Fax: (+66)-43-202421 E-mail : graduate@kku.ac.th
