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－　　－28Yoshihiro NAKAMURAProfessor, Department of Mathematical Information EngineeringYoshihiro Nakamura is a professor at the Department of Mathematical Information Engineering, College of Industrial Technology of Nihon University. He received his B.E., M.E., and Dr. Eng. degrees in Information Science and Intelligent Systems from Tokushima University in 1989, 1991 and 2002, respectively. He worked for Nippon Telephone and Telegraph Corporation from 1991 to 2007. While he had been working at NTT’s R&D division, his major research topics were user interfaces, intelligent CAI systems, and network operation systems. He joined Nihon University in 2007. Dr. Nakamura’s research interests are human-computer interaction, wearable input devices and user adaptive interfaces. He is a member of the Institute of Electronics, Information and Communication Engineers, the Information Processing Society of Japan and the Human Interface Society.Research Achievements1)PhKey: An Input Interface for Wearable Devices Using Phalanges as Keys, Journal of Information Processing, Vol.62, No.2, Feb. 2021. (in press)2)QuadKey: A Japanese Kana Character Input Method for Smartwatches with Four Keys, Journal of Information Processing, Vol.60, No.8, 1403-1412, Aug. 2019.3)Character Input Methods for Wearable Computers Using a Distance Sensor at the Wrist, Journal of Human Interface Society, Vol.17, No.2, 233-244, May. 2015.4)An Active Help System Adapting the User’s Acquisition Knowledge Level, Journal of Human Interface Society, Vol.14, No.1, 53-64, Feb. 2012.Fig. 1 QuadKeyFig. 2 Examples of text entryTable 1 Input Speeds and error rates of existing methods.