Improved direct gradient descent control of general nonlinear systems. - Kiyotaka Shimizu; K. Otsuka; J. Naiborhu (ECC, 1999)

Direct gradient descent control of general nonlinear systems. - Kiyotaka Shimizu; K. Otsuka; T. Yamaguchi (ACC, 2002)

Diurnal sea surface temperature warming and its impact on mesoscale air-sea interaction in a coastal area. - Yoshimi Kawai; Hiroshi Kawamura; K. Otsuka (IGARSS, 2003)

Measurement Method for the Concentration of Hydrogen Sulfide in Pore Water Applying Sensor Part of Undersea Systems. - M. Utsumi; T. Nishiyama; R. Arai; N. Nakatani; N. Iwasa; Y. Tsukahara; K. Otsuka (ICETET, 2012)