1. Patent Examiner, Transport Machinery Exam. Division, Korean Intellectual Property Office, Gov. Complex Daejeon Bldg. 4, 189, Cheongsa-ro, Seo-gu, Daejeon 302-701, Republic of Korea; formerly, Senior Researcher and Head of Group, Flight Control Group, Korean Air Research and Development Center, 461-1 Jeonmin-dong, Yuseong-gu, Daejeon 305-811, Republic of Korea.
2. Researcher, Flight Control Group, Korean Air Research and Development Center, 461-1 Jeonmin-dong, Yuseong-gu, Daejeon 305-811, Republic of Korea.
3. Professor, Dept. of Aerospace Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Republic of Korea (corresponding author).