1. Department
of Advanced Materials Engineering for Information and Electronics, Kyung Hee University, 1732 Deogyeong-daero, Giheung-gu, Yongin, Gyeonggi-do 446-701, Republic of Korea
2. Division of Materials Science
and Engineering, Hanyang University, 222 Wangsimni-ro, Seoul 133-719, Republic of Korea