Design and Analysis of 239 GHz CMOS Push-Push Transformer-Based VCO With High Efficiency and Wide Tuning Range. - Hyunji Koo; Choul-Young Kim; Songcheol Hong (IEEE Trans. Circuits Syst. I Regul. Pap., 2015)

Uncertainty Analysis for Characterization of a Commercial Real-Time Oscilloscope Using a Calibrated Pulse Standard. - Chihyun Cho; Hyunji Koo; Jae-Yong Kwon; Joo-Gwang Lee (IEEE Access, 2019)

Uncertainty Analysis of Scattering Parameters Calibrated by an Electronic Calibration Unit Based on a Residual Model. - Chihyun Cho; Jae-Yong Kwon; Hyunji Koo; Tae-Weon Kang (IEEE Access, 2022)

Pin-Gap Correction of Coaxial Calibration Standards for TRL or LRL Calibration. - Hyunji Koo; Chihyun Cho; Tae-Weon Kang; Jae-Yong Kwon (IEEE Access, 2022)

A Novel Method for Estimating Residual Model Parameters to Evaluate Uncertainty in Scattering Parameter Measurements. - Chihyun Cho; Tae-Weon Kang; Jae-Yong Kwon; Hyunji Koo (IEEE Trans. Instrum. Meas., 2022)

Establishing a D-Band Waveguide Impedance Standard Including the Random Effects of a Vector Network Analyzer for 6G Wireless Communications. - Chihyun Cho; Tae-Weon Kang; Jae-Yong Kwon; Hyunji Koo (IEEE Trans. Instrum. Meas., 2023)

Design of a Waveguide Calibration Kit Consisting of Offset Shorts for Low Measurement Uncertainty. - Chihyun Cho; Jae-Yong Kwon; Tae-Weon Kang; Hyunji Koo; Woohyun Chung (IEEE Access, 2024)

Evaluation of Random Errors for Vector Network Analyzers Based on a Residual Model. - Chihyun Cho; Tae-Weon Kang; Hyunji Koo; Woohyun Chung (IEEE Trans. Instrum. Meas., 2024)

A New Short-Shim-Thru Calibration Method to Replace SOLT in Waveguide Measurement Systems. - Chihyun Cho; Hyunji Koo; Woohyun Chung; Sangsu Lee (IEEE Trans. Instrum. Meas., 2025)