1. Associate Professor, Dept. of Oceanography, Inha Univ., Inchon, 402-751, Korea.
2. Research Assistant, Dept. of Oceanography, Inha Univ., Inchon, 402-751, Korea.
3. President, GeoSystem Research Corp., 7301 Dongil Techno Town 7th, Anyang, Kyonggi-do, 431-062, Korea.
4. Researcher, Korea Ocean Science and Engineering Corp., 175-9 Huam-dong Youngsan-gu, Seoul, 140-190, Korea.