1. School of Advanced Materials Science and Engineering, Sungkyunkwan University, Suwon, Gyeonggi-do 440-746, South Korea
2. Department of Materials Engineering, Pukyong National University, Busan 48547, South Korea
3. Nopion Co., Ltd., 84, Jangan-ro 309 beon-gil, Jangan-gu, Suwon 16336, Gyeonggi-do, South Korea