A Study on High-Output Resonance-Driven Piezoelectric Micropumps Using Active Check Valves. - Jung-Ho Park; Kazuhiro Yoshida; Chikara Ishikawa; Shinichi Yokota; Takeshi Seto; Kunihiko Takagi (J. Robotics Mechatronics, 2004)

Detection of overlapping acoustic events based on NMF with shared basis vectors. - Kazumasa Yamamoto; Chikara Ishikawa; Koya Sahashi; Seiichi Nakagawa (GCCE, 2017)