Dead-zone-less PLL frequency synthesizer by hybrid phase detectors. - Yasuaki Sumi; Shigeki Obote; Naoki Kitai; Ryousuke Furuhashi; Hidekazu Ishii; Yoshitaka Matsuda; Yutaka Fukui (ISCAS (4), 1999)

PLL synthesizer with multi-programmable divider and multi-phase detector. - Yasuaki Sumi; Shigeki Obote; Naoki Kitai; Hidekazu Ishii; Ryousuke Furuhashi (IEEE Trans. Consumer Electron., 1999)

Velocity control of 2-mass-spring systems with large load uncertainty-an adaptive backstepping control approach. - Kang-Zhi Liu 001; Susumu Namiki; Hidekazu Ishii (CDC, 2003)

A high sensitivity compact gas concentration sensor using UV light and charge amplifier circuit. - Hidekazu Ishii; Masaaki Nagase; Nobukazu Ikeda; Yoshinobu Shiba; Yasuyuki Shirai; Rihito Kuroda; Shigetoshi Sugawa (IEEE SENSORS, 2016)