Minimizing due date related measures for a single machine scheduling problem with outsourcing allowed. - Ik Sun Lee; C. S. Sung (Eur. J. Oper. Res., 2008)

A coordinated scheduling of production-and-delivery under dynamic delivery cost environments. - Ik Sun Lee (Comput. Ind. Eng., 2015)

Parallel machine scheduling with maintenance activities. - Jaewook Yoo; Ik Sun Lee (Comput. Ind. Eng., 2016)

Minimizing total completion time in the assembly scheduling problem. - Ik Sun Lee (Comput. Ind. Eng., 2018)

Scheduling of two-machine flowshop with outsourcing lead-time. - Eun-Seok Kim; Ik Sun Lee (Comput. Oper. Res., 2022)

Three-machine flowshop scheduling with outsourcing lead-time. - Eun-Seok Kim; Kangbae Lee; Ik Sun Lee (Comput. Oper. Res., 2025)