Takashi Hamatani is a 3rd year Ph.D. student of Osaka university in Japan. He received a Master's Degree in Information Science from Osaka University in 2015. His research interests are in mobile computing, wearable computing and pervasive health care application. His major research topic is "core temperature estimation" for heat stroke prevention. He worked as a JSPS special researcher (DC2) from 2017. He is a student member of IPSJ.