Robust H∞ FIR filtering for uncertain time-varying nonlinear systems. - Hee-Seob Ryu; Kyung-Sang Yoo; Oh-Kyu Kwon; Dae-Woo Kim; Choon-Bae Park (CDC, 2000)

Some conditions for monotone nondecreasing step response with the fastest rise time. - Byung-Moon Kwon; Hee-Seob Ryu; Oh-Kyu Kwon (ACC, 2001)

Robust H∞ FIR filtering with sampled-data measurements. - Hee-Seob Ryu; Byung-Moon Kwon; Myung-Eui Lee (ACC, 2001)