Improvement of low-speed operation performance of DTC for three-level inverter-fed induction motors. - Kyo-Beum Lee; Joong-Ho Song; Ick Choy; Ji-Yoon Yoo (IEEE Trans. Ind. Electron., 2001)

Improving crest factor of electronic ballast-fed fluorescent lamp current using pulse frequency modulation. - Jooho Song; Joong-Ho Song; Ick Choy; Ju-Yeop Choi (IEEE Trans. Ind. Electron., 2001)

Robust adaptive flux observer for induction motor control. - Sung-Hoe Huh; Dongwon Kim; Gwi-Tae Park; Ick Choy (SMC, 2003)