"PI3D Processing of DLC coatings for different applications" SA Nikiforov, HJ Ryoo, HS Oh, GH Rim , (Physical status solidi C) , Vol.5 , No.4 , pp.968-972 , Sep.2007

"Semiconductor switch-based fast high-voltage pulse generators" JH kim, IW Jeong, HJ Ryoo, S Shenderey, JS kim, GH Rim , PPC-2003. 14th IEEE International Pulsed Power Conference (Physical status solidi C) , Vol.1 , No.3 , pp.665-668 , Jun.2003

"Unit power factor operation of parallel operated AC to DC PWM converter for high power traction application" HJ Ryoo, JS Kim, GH Rim, YJ kim, MH Woo, CY Won , 2001 IEEE 32nd Annual Power Electronics Specialists Conference (Physical status solidi C) , Vol.2 , No.1 , pp.631-636 , Jun.2001