The design of a fuzzy cascade controller for ball and beam system: A study in optimization with the use of parallel genetic algorithms. - Sung-Kwun Oh; Han-Jong Jang; Witold Pedrycz (Eng. Appl. Artif. Intell., 2009)

A comparative experimental study of type-1/type-2 fuzzy cascade controller based on genetic algorithms and particle swarm optimization. - Sung-Kwun Oh; Han-Jong Jang; Witold Pedrycz (Expert Syst. Appl., 2011)

Optimized fuzzy PD cascade controller: A comparative analysis and design. - Sung-Kwun Oh; Han-Jong Jang; Witold Pedrycz (Simul. Model. Pract. Theory, 2011)