686 «"√ "√«'®—¬·≈-æ —≤π" ¡®∏. ª ï∑'Ë 31 ©∫ —∫∑ 'Ë 4 µ ÿ≈"§¡-∏ —π«"§¡ 2551 Adisak Pongpullponsak 1, Wipawan Singhaprink 1, Ungsana Chundang 1, Tasanee Tantipisalkul 2, Puchong Praekhaow 2, Ornrudee Suttisri 2, Prapanporn Rattana 3, and Suwanna Jemkitjavaroth 4 King Mongkutûs University of Technology Thonburi, Bangmod ....