Guaranteed cost and H∞ filtering for discrete-time polytopic uncertain systems with time delay. - Jong Hae Kim; Seong Joon Ahn; Seungjoon Ahn (J. Frankl. Inst., 2005)

Efficient electron beam condensing for low-energy microcolumn lithography. - Ho Seob Kim; Seungjoon Ahn; Dae Wook Kim; Tae-Sik Oh; Seong Joon Ahn (Microelectron. J., 2008)