1. School of Electrical Engineering #032, Seoul National University, Kwanak P. O. Box 34, Seoul 151-600, Republic of Korea
2. Department of Creative Convergence Engineering, School of Global Convergence Studies, Hanbat National University, Daejeon, 305-719, Republic of Korea
3. Department of Anatomy, College of Korean Medicine, Kyung Hee University, Seoul 130-701, Korea