Design of rectangular printed planar antenna via input impedance for supporting mobile wireless communications. - Keehong Um; Beongku An (VTC Spring, 2002)

Carbon Nanotube as a New Coating Material for Developing Two Dimensional Speaker Systems. - Jeong Jin Kang; Keehong Um (ACN, 2011)

Developing Ultrasonic Wave Oscillators Using Low Speed Analog to Digital Converter. - Jeong Jin Kang; Keehong Um; Sooyeup Yoo; Jong-Jin Park; Sang-Bong Park (FGIT-MulGraB/BSBT/IUrC, 2012)

Determination of a Pair of Single Stationary Zeros in Cross-Coupled Systems. - Keehong Um; Yong Soon Im; Gye-Kuk Kim; Jeong Jin Kang (FGIT, 2012)