Development of a Surface Roughness Measurement System in a Narrow Borehole. - Eiki Okuyama; Yuichi Suzuki; Masahiro Morikawa; Yuma Suzuki; Ichiro Yoshida (Int. J. Autom. Technol., 2016)

Low-Frequency Characterization of Music Sounds - Ultra-Bass Richness from the Sound Wave Beats. - Masahiro Morikawa (CoRR, 2021)

A simple model for pink noise from amplitude modulations. - Masahiro Morikawa; Akika Nakamichi (CoRR, 2023)

Solar Flare 1/f Fluctuations from Amplitude-Modulated Five-Minute Oscillation. - Masahiro Morikawa; Akika Nakamichi (Entropy, 2023)

Dynamic Synchronization and Resonance as a Universal Origin of 1/f Fluctuations - Amplitude Modulation Across Music and Nature. - Akika Nakamichi; Izumi Uesaka; Masahiro Morikawa (CoRR, 2025)