1. National
Institute of Supercomputing and Networking, Korea Institute of Science and Technology Information, Daejeon 305-806, Republic of Korea
2. Samsung
Advanced Institute of Technology, Samsung Electronics Co., Ltd., Yongin, Gyeonggi-Do 446-712, Republic of Korea
3. Department
of Materials Science and Engineering, Hanbat National University, Daejeon 305-719, Republic of Korea