Director, Korean Oral and Maxillofacial Implant Society Director, Department of Dentistry, Korean Society of Biomaterials Specialist Director, Department of Dentistry, Department of Health and Welfare, Ministry of Health and Welfare, Member of New Medical Technology Evaluation Committee Former Vice President of Wonkwang University College of Dentistry Former Professor of School of Dentistry, Wonkwang University Former Director of Biomaterial Implantation Research Center, Wonkwang University Food and Drug Safety Former member of the Central Pharmacist Review Committee, National Research Foundation of Korea, Former Senior Specialist, Representative of Dentistry, College of Medicine, National Research Foundation of Korea Former Member, Health Technology Policy Review Committee, Ministry of Health, Welfare and