A 30-MHz mixed analog/digital signal processor. - Sumitaka Takeuchi; Hiroyuki Kouno; Yoshinori Hayashi; Atsushi Maeda; Keisuke Okada; Nobuharu Yazawa (IEEE J. Solid State Circuits, 1990)

A self-learning neural network chip with 125 neurons and 10 K self-organization synapses. - Yutaka Arima; Koichiro Mashiko; Keisuke Okada; Tsuyoshi Yamada; Atsushi Maeda; Harufusa Kondoh; Shimpei Kayano (IEEE J. Solid State Circuits, 1991)

A 336-neuron, 28 K-synapse, self-learning neural network chip with branch-neuron-unit architecture. - Yutaka Arima; Koichiro Mashiko; Keisuke Okada; Tsuyoshi Yamada; Atsushi Maeda; Hiromi Notani; Harufusa Kondoh; Shinpei Kayano (IEEE J. Solid State Circuits, 1991)

A 10-b 50 MS/s 500-mW A/D converter using a differential-voltage subconverter. - Takahiro Miki; Hiroyuki Kouno; Toshio Kumamoto; Yasushi Kinoshita; Takayuki Igarashi; Keisuke Okada (IEEE J. Solid State Circuits, 1994)

A 10 bit 20 MS/s 3 V supply CMOS A/D converter. - Masao Ito; Takahiro Miki; Shiro Hosotani; Toshio Kumamoto; Yukihiro Yamashita; Masaki Kijima; Takashi Okuda; Keisuke Okada (IEEE J. Solid State Circuits, 1994)

A design of high-performance multiplier for digital video transmission. - Keisuke Okada; Shun Morikawa; Isao Shirakawa; Sumitaka Takeuchi (ASP-DAC, 1995)

A high performance FIR filter dedicated to digital video transmission. - Shun Morikawa; Keisuke Okada; Sumitaka Takeuchi; Isao Shirakawa (ASP-DAC, 1997)

A multilevel QAM demodulator VLSI with wideband carrier recovery and dual equalizing mode. - Kazuya Yamanaka; Sumitaka Takeuchi; Shuji Murakami; Masayuki Koyama; Jun Ido; Takashi Fujiwara; Susumu Hirano; Keisuke Okada; Tadashi Sumi (IEEE J. Solid State Circuits, 1997)

Five-Factor Musical Preference Prediction for Solving New User Cold-Start Problem in Content-Based Music Recommender System. - Keisuke Okada; Tan Phan-Xuan; Eiji Kamioka (IISA, 2021)

Exploiting MUSIC model to solve cold-start user problem in content-based music recommender systems. - Keisuke Okada; Manami Kanamaru; Tan Phan-Xuan; Eiji Kamioka (Intell. Decis. Technol., 2021)