Reliability optimization of a series system with multiple-choice and budget constraints. - C. S. Sung; Y. K. Cho (Eur. J. Oper. Res., 2000)

Macroeconomic labour productivity and its impact on firm's profitability. - Kunhee Choi; M. Haque; Hyun Woo Chris Lee; Y. K. Cho; Young Hoon Kwak (J. Oper. Res. Soc., 2013)