1. Physics Program, Faculty of Science and Techn ology, Nakhon Pathom Rajabhat University, Nakhon Pathom, Thailand
2. Center of Excellence in Glass Technology and Materials Science (CEGM), Nakhon Pathom Rajabhat University, Nakhon Pathom, Thailand
3. Department of Physics, Kyungpook National University, Daegu, Republic of Korea