Junseok Ma

● Publications

Dissertation (2)

1. Junseok Ma, "A Study of Liquid Crystal-based Phase Shifter in the Millimeter-wave Range for Utilizing Current Mass-production Technology of Display Industry.", MS thesis, 2021, Department of Electrical Engineering, Pohang University of Science and Technology, Pohang, Korea.

2. Junseok Ma, "Development of Multifunctional Reconfigurable Liquid Crystal Devices Using Drop-on-Demand Printing", PhD thesis, 2025, Department of Electrical Engineering, Pohang University of Science and Technology, Pohang, Korea.

Journal Papers (14)

1. J. S. Ma, W.S. Kim*, S. Morris* et al , "Advanced Image-Integrated Smart Windows using Printed Electrochromic Polymer-Dispersed Liquid Crystal Droplets", Advanced Optical Materials (2025). 

2. J.-S. Ma, A. Pradeep, S.-W. Oh, J.-H. Lee, J.-Y. Choi, S.-O. Cha, H.-W. Oh, W.-S. Kim*, "Operating temperature regulation in push-pull azobenzene-doped liquid crystal light-driven devices using UV absorber", Dyes and Pigments (2025), in press.

3. Sang-Hee Lee+, Sun-Geun Park+, Jun-Seok Ma, Wook-Sung Kim, and Seung-Won Oh*, "High-performance switchable visor for augmented reality using low-voltage, fastresponse cholesteric liquid crystals", Dyes and Pigments (2025). 

4. S.O. Cha, J.H. Ka, I.B. Kong, J.S. Ma, S.Y. Park, and W.S. Kim*, "Off-Center Rotational Dynamics in Virtual Reality: Effects on Cybersickness and Presence", IEEE Access (2025). 

5. A. Pradeep*, U. Mur, J.S. Ma, N. Spiller, Y. Jin, W. Kamal, S.J. Elston*, S.M. Morris*, "Locking metastable topological domains in nematic liquid crystal Pi cells", Advanced Functional Materials (2025). - (Featured as Editor's Pick)

6. "Reconfigurable Wideband Bandpass Filter Using Stepped Impedance Resonator Based on Liquid Crystals", Jin-Young Choi, Jun-Seok Ma, and Wook-Sung Kim*, Electronics (2025)

7. S. Park, J. Ma, S. Oh, and W. Kim "Blur image representation in defocus using generalized Gaussian kernel", Information Disp (2025).

8. “Reconfigurable Narrow-Band Bandpass Filter Using Electrically-Coupled Open-Loop Resonators Based on Liquid Crystals”, Jinyoung Choi, Junseok Ma, Hyunwoo Oh, and Wooksung Kim*, J. Phys. D: Appl. Phys. (2024).

9. “Advanced Light: Liquid crystals-based ultra-broadband polarization rotator for functional smart devices”, Jae-Hwan Lee, Jun-Seok Ma, Chan-Heon An, Gi-Ho Lee, and Seung-Won Oh*, Small Methods (2023). 

10. “Liquid Crystals for Advanced Smart Devices with Microwave and Millimeter-wave Applications: Recent Progress for Next-generation Communication", Junseok Ma, Jinyoung Choi, Sungeun Park, Imbo Kong, Daehyeon Kim, Cheonga Lee, Youngno Youn, Myeonggin Hwang, Seungwon Oh*, Wonbin Hong*­­­­, and Wooksung Kim*,  Adv. Mater. (2023)  - (Featured as Fortispiece Cover)

11. "Phase Shifting Enhancement of a Substrate-Integrated Waveguide Phase Shifter based on Liquid Crystal", Hyunji Shin+, Junseok Ma+, Jinyoung Choi+, and Wooksung Kim*, Appl. Sci. (2023). (+  Authors contributed equally to this work.)

12. "An evaluation of Surface-Active Agent Hexadecyltrimethylammonium Bromide with Vertical Self-Alignment Properties to Align Liquid Crystals for Various Cell Gap Conditions", Junseok Ma, Jinyoung Choi, Hyunji Shin, Jaewhan Lee, Seungwon oh*, and Wooksung Kim*,  Appl. Sci. (2022).

13. "Liquid-Crystal-Based Floating-Electrode-Free Coplanar Waveguide Phase Shifter with an Additional Liquid-Crystal Layer for 28-GHz Applications", Junseok Ma, Jinyoung Choi, Seungwon Oh, and Wooksung Kim, Journal of Physics D: Applied Physics (2021).

14. "액정의 고주파 대역 특성과 RF 응용 기술 동향", Junseok Ma, Jinyoung Choi, Wooksung Kim, 인포메이션 디스플레이 제22권 제3호 (2021).

International Conference Papers (7)

1. “Analysis of Meander Delay Line Liquid Crystal Phase Shifter using Director Angle Extraction” , Hyunwoo Oh, Sungeun Park, Jinyoung Choi, Junseok Ma, Seungho Choi and Wooksung Kim 2024 International Meeting on Information Display (IMID) (2024).

2. "Characterization of Nematic Liquid Crystals at 10 GHz using an Open Stub Resonator", Jinyoung Choi, Junseok Ma, Hyunwoo Oh, and Wooksung Kim, AP-S/URSI 2024 (2024).

3. "Reconfigurable Phased Array Antenna Based on Liquid Crystal With Miniaturized Bandpass Filter", Jinyoung Choi, Junseok Ma, Hyunji Shin, and Wooksung Kim, ISAP, Oct.31-Nov.3, 2022 (2022).

4. "Phase Shift Enhancement of Substrate Integrated Waveguide Phase Shifter Using Liquid Crystal", Hyunji Shin, Jinyoung Choi, Junseok Ma, and Wooksung Kim, IMID, KOREA, Aug.23-26, 2022 (2022).

5. "Comparative Analysis of Liquid-Crystal Driving between the Grounded-Coplanar Waveguide and the Floating-Electrode-Free Coplanar Waveguide in Liquid-Crystal Phase Shifters", Jun-Seok Ma, Jin-Young Choi, Hyun-Ji Shin, and Wook-Sung Kim, AP-S/URSI 2022 (2022).

6. "Analysis about Novel Design of Liquid Crystal Based Floating Electrode Free Coplanar Waveguide Phase Shifter for Performance Improvement", Junseok Ma, Hyunji Shin, and Wooksung Kim, IMID, KOREA, Aug.25-27, 2021 (2021).

7. "Concept and Numerical Modeling for virtual acceleration sense on vestibular organ using focused ultrasound", Sion Cha, Junseok Ma, and Wooksung Kim, IMID, KOREA, Aug. 25-28, 2020 (2020). 

Domestic Conference Papers (3)

1. Junseok Ma, Seungwon Oh, Jinyoung Choi, Hyunwoo Oh, Stephen M. Morris*, and Wooksung Kim*, "Enhancing Light-driven Polymer Stabilized Liquid Crystal Smart Devices",  The British Liquid Crystal Society: BLCS (2024).

2. "Characterization of Nematic Liquid Crystal at 10 GHz using Director Angle Extraction", Jinyoung Choi, Junseok Ma, Hyunwoo Oh and Wooksung Kim*, Korea Liquid Crystal Conference, 2024.

3. "전기적 커플링 오픈 스터브를 이용한 소형 액정 기반 가변 광대역 대역저지 필터", Jinyoung Choi, Junseok Ma, Sungeun Park, and Wooksung Kim*, IEIE (2023). 

● Awards

1. 2025 Jang YounSil Postdoctoral Fellowship, Korea Advanced Institute of Science and Technology (KAIST), Republic of Korea (2025)

2. 2024 POSTECHIAN Fellowship, Pohang University of Science and Technology (POSTECH), Republic of Korea (2024)

3. Excellent Paper Challenge Prize, 4th POSTECH Best Paper Competition, POSTECH, Republic of Korea (2024)

4. Excellence Awards (2nd prize), 3rd Outstanding Performance (Outstanding Student) Contest, Department of Electrical Engineering at POSTECH, Republic of Korea (2024).

5. BK21 FOUR Outstanding Graduate Student International  Funding Program for visiting the University of Oxford, sponsored by the Government of the Republic of Korea (2023).

6. Grand Prize, The 8th Electromagnetic Wave Measurement Thesis Contest, The Korean Institute of Electromagnetic Engineering and Science, Republic of Korea (2023).