"High-Electron-Mobility SiGe on sapphire substrate for fast chipsets"

Hyun Jung Kim , Yeonjoon Park, Hyung Bin Bae, Sang H. Choi, , Advances in Condensed Matter Physics, Article ID: 785415 , Published

"Feasibility study of green energy-powered dirigible transportation"

Hyun Jung Kim , Jonathan R. Skuza, Yeonjoon Park, Shane T. Seaman, Glen C. King, Sang H. Choi, Kyo D. Song, Hargsoon Yoon, and Kunik Lee, , NASA/Technical Memorandum (TM), NASA/TM-2014-218241 , Published