1. Department of Materials Science and Engineering Hanbat National University Daejeon 34158 Republic of Korea
2. Department of Materials Science and Engineering Korea University Seoul 02841 Republic of Korea
3. Division of Energy and Optical Technology Convergence Cheongju University Cheongju 28503 Republic of Korea
4. Asentec Co., Ltd. Chungnam 31418 Republic of Korea
5. Sejong Industrial Co., Ltd. Ulsan 44252 Republic of Korea