Biometrie authentication using hand movement information from wrist-worn PPG sensors. - Tomoaki Ohtsuki; Hiroto Kamoi (PIMRC, 2016)

Fall Detection Using UHF Passive RFID Based on the Neighborhood Preservation Principle. - Hiroto Kamoi; Kentaroh Toyoda; Tomoaki Ohtsuki (GLOBECOM, 2018)