On supremal languages of classes of sublanguages that arise in supervisor synthesis problems with partial observation. - Hangju Cho; Steven I. Marcus (Math. Control. Signals Syst., 1989)

Supremal and Maximal Sublanguages Arising in Supervisor Synthesis Problems with Partial Observations. - Hangju Cho; Steven I. Marcus (Math. Syst. Theory, 1989)

Closed-form solutions of optimal guidance with terminal impact angle constraint. - Chang-Kyung Ryoo; Hangju Cho; Min-Jea Tahk (CCA, 2003)

Time-to-go weighted optimal guidance with impact angle constraints. - Chang-Kyung Ryoo; Hangju Cho; Min-Jea Tahk (IEEE Trans. Control. Syst. Technol., 2006)