1. Center for Advanced Plasma Surface Technology, NU-SKKU Joint Institute for Plasma-Nano Materials, School of Advanced Materials Science and Engineering; Sungkyunkwan University; Suwon 440-746 Korea
2. Program of Physics, Faculty of Science and Technology; Sakon Nakhon Rajabhat University; Sakon Nakhon- 47000 Thailand
3. Department of Industrial Engineering, Faculty of Engineering; Chiang Mai University; Chiang Mai- 50200 Thailand