1. Graduate School of Engineering, Nagoya Institute of Technology, Nagoya, Aichi, Japan
2. Radio Technology Research Department, Electronics and Telecommunications Research Institute (ETRI), Daejeon, Korea
3. Department of Radio and Information Communication Engineering, Chungnam National University, Yuseong-gu, Daejeon, Korea
4. Department of Neurosurgery, Ajou University School of Medicine, Suwon, Korea
5. Kagawa University, Takamatsu, Kagawa, Japan