1. Specialized Graduate School of Science and Technology Convergence, Pukyong National University, 365 Sinseon-ro, Nam-gu, Busan 48547, Korea
2. Interdisciplinary Program of Biomedical Mechanical and Electrical Engineering, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan 48513, Korea
3. School of Electrical Engineering, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan 48513, Korea