333 Moo1, Thasud, Muang, Chiang Rai 57100 Tel: 0-5391-6000, 0-5391-7034 Fax: 0-5391-6034, 0-5391-7049 Mae Fah Luang University, Bangkok Office Tel: 0-2679-0038-9 Fax: 0-2679-0038