Dr. Wansoo Nah
School of Electronic and Electrical Engineering, SungKyunKwan University (SKKU), Suwon, Korea
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Academic Career Length
25Years (2002-Present)
(Calculated once Scilit publication data is synced: current year − year of first publication + 1)
Representative Publications
View All Publications11 January 2018 in IEEE Transactions on Electromagnetic Compatibility
Journal Article
JYJawad Yousaf
Jawad YousafMPMyeongkoo Park
Myeongkoo Park
HLHosang Lee
Hosang Lee
JYJinsung Youn
Jinsung Youn
DLDaehee Lee
Daehee Lee
Wansoo Nah +1
In this work, a new technique for an efficient, simple, and fast equivalent circuit and full wave numerical modeling of the electrostatic discharge (ESD) generator is presented. A novel circuit model of the NoiseKen ESD simulator is proposed based on the frequency domain measurement of the standard waveform calibration setup. The simple full wave electromagnetic model of the same generator, which requires much less computation resources, is also proposed using commercial CST Microwave Studio software. The reliability of the proposed models as an authentic ESD excitation source is validated through an example discharge application. The good agreement between the ESD reference waveform obtained through measurement, circuit model, and 3-D model of the generator is observed.
1 June 2017 in IEEE Transactions on Electromagnetic Compatibility
Journal Article
JYJawad Yousaf
Jawad YousafJSJaeyoung Shin
Jaeyoung Shin
KKKwangho Kim
Kwangho KimJYJinsung Youn
Jinsung Youn
DLDaehee Lee
Daehee Lee
Wansoo Nah +1
This paper proposes a novel way for the estimation of the system level electrostatic discharge (ESD) coupling using the frequency-domain measurements. ABCD parameters are calculated from the measured (simulated) S-parameters of the equipment under test (EUT). The transfer function of the system level ESD coupling is derived from the ABCD-parameters. The derived transfer function estimates the induced coupling to the EUT quite well for the input ESD stressing. For the ESD source modeling, a novel simple and efficient circuit model of ESD generator is also presented. A good agreement is obtained between the measured and simulated results based on derived coupling transfer impedance function. The proposed method permits the efficient ESD coupling analysis without the need of additional electromagnetic modeling of EUT and ESD generator for various ESD input voltage levels.
15 December 2020 in IEEE Access
Journal Article
JYJawad Yousaf
Jawad YousafWansoo Nah
Mousa I HusseinJYJun Gyu Yang
Jun Gyu Yang
Amir AltafMEManzoor Elahi
Manzoor Elahi
This study presents a comprehensive review of the characterization techniques of a reverberation chamber (RC). After describing the limitations of the theoretical models for the determination of the lowest usable frequency (LUF) of a chamber, the normative procedure of IEC 61000-4-21 standard is summarized for the estimation of LUF of an RC. Then a brief overview of the recent approaches for the full-wave EM modeling and characterization of EM fields in an RC using statistical tests is presented. The study also discusses the limitations of conventional field uniformity based RC calibration procedure with a review of the recently proposed fast indirect validation procedure of RC using S-parameters measurements. Lastly, this work reviews the estimation of the RC quality factor (Q-factor) using analytical, time-and frequency-domain techniques and their limitations.
1 August 2002 in Physica C: Superconductivity and its Applications
Journal Article
JKJoonsun Kang
Joonsun KangJLJoon-Ho Lee
Joon-Ho LeeWansoo NahDKDong-Hun Kim
Dong-Hun KimIPIl-Han Park
Il-Han Park
JJJinho - Joo
Jinho - Joo24 May 2019 in International Journal of Automotive Technology
Journal Article
JLJunesang Lee
Junesang Lee
JHJungrae Ha
Jungrae Ha
MKMinho Kim
Minho Kim
SYSangwon Yun
Sangwon Yun
YKYeongsik Kim
Yeongsik Kim
Wansoo Nah14 January 2020 in IEEE Transactions on Electromagnetic Compatibility
Journal Article
About Me
1.
Wansoo Nah: Professor, Department of Electrical and Computer Engineering, Sungkyunkwan University
2.
BSc in Electrical Engineering, Seoul National University, 1984
MSc in Electrical Engineering, Seoul National University, 1986
PhD in Electrical Engineering, Seoul National University, 1991
3.
Guest Collaborator, Superconducting Super Collider Laboratory, USA, 1991–1993
Senior Researcher, Korea Electrical Research Institute, Changwon, South Korea, 1991–1995
Professor, College of Information and Communication Engineering, Sungkyunkwan University, Suwon, South Korea, 1995–present
4.
Current research interests: electromagnetic interference/compatibility system analysis and design.
Previous research: superconductors
5.
Memberships:
Korea National Radio Research Institute, Member of the Industrial Standards Review Committee, Electromagnetic Compatibility Technology Deliberation Committee (2022)
Korea National Radio Research Institute, Member of the Industrial Standards Technical Committee (CISPR/D) (2023)