1. Seoul National University, School of Mechanical and Aerospace Engineering, Seoul 151-742, Republic of Korea
2. SNU Precision Co., Ltd., #201, 1629-2, Nakseongdae-dong, Kwanak-gu, Seoul 151-818, Republic of Korea
3. Applied Optical Equipment Group, Samsung Electro-Mechanics, 314, Maetan 3-dong, Yeongtong-gu, Suwon-si, Gyeonggi-do 443-743, Republic of Korea