- Flow Visualization
- Visualization in Tribology
- Kohtaro Ohba, Hitoshi Soyama, Sho Takeda, Hikaru Inooka and Risaburo Oba,
- "High-Speed Observations on Highly Erosive Vortex Cavitation Using Image Processing",
- Journal of Flow Visualization and Image Processing, Vol.2, No.2, pp.161-172, April 1995.
- Hitoshi Soyama, Kohtaro Ohba, Toshiaki Ikohagi, Risaburo Oba,
- "Characteristic Motion of Highly Erosive Vortex Cavitation",
- Journal of Turbo Machine, Vol.23, No.6, pp13-16, June 1995.
Visualization in Tribology
- Ryu Gun, Kohtaro Ohba, Koji Kato and Hikaru Inooka,
- "Partial Slip Visualization at Contact Surface and Verification of its Accuracy",
- Journal of Visualization Sciety of Japan, Vol.15, No.57, pp.47-53, May 1995.