Scheduling problem in a two-machine flow line with the N-step prior-job-dependent set-up times. - Ji Ung Sun; Hark Hwang (Int. J. Syst. Sci., 2001)

An Ant Colony System Hybridized with a Genetic Algorithm for the Capacitated Hub Location Problem. - Ji Ung Sun; Dan-Ho Park (ICHIT (1), 2012)

Bilayer Local Search Enhanced Particle Swarm Optimization for the Capacitated Vehicle Routing Problem. - A. K. M. Foysal Ahmed; Ji Ung Sun (Algorithms, 2018)