1. School of Electronic and Electrical Engineering, College of IT Engineering, Kyungpook National University 1 , 80, Daehak-ro, Buk-gu, Daegu 41566, South Korea
2. Department of Otolaryngology, School of Medicine, Ajou University 2 , 206, World cup-ro, Yeongtong-gu, Suwon 16499, South Korea