Publications

Dissertations

  1. J. Ma, “Development of Multifunctional Reconfigurable Liquid Crystal Devices Using Drop-on-Demand Printing,” Ph.D. Dissertation, Dept. of Electrical Engineering, POSTECH, Korea, 2025.
  2. J. Ma, “A Study of Liquid Crystal-based Phase Shifter in the Millimeter-wave Range for Utilizing Current Mass-production Technology of Display Industry,” M.S. Thesis, Dept. of Electrical Engineering, POSTECH, Korea, 2021.

Journal Publications

  1. Sungeun Park, Junseok Ma, Seung-Won Oh*, and Wooksung Kim*, “Reducing External Light Interference in OST HMDs via Human-Perception-Based Pattern Design,” Scientific Reports, Submitted
  2. Jong-Min Baek, Sun-Geun Park, Junseok Ma, Sunghyun Bae, and Seung-Won Oh*, “A Numerical Study on a Voltage-Tunable Quasi-Broadband Depolarizer Enabled by Periodic Protrusion-Induced Liquid Crystal Reorientation,” Current Applied Physics, Submitted
  3. Jun-Seok Ma†, Ga-Yeong Park†, Geunjung Lee, Hyo-Won Lee, Jong-Won Yu*, and Dong Ki Yoon*, “Coating-Free Nanoscratching for Liquid-Crystal Alignment on PCB-Compatible Millimeter-Wave Reflective Unit Cells”, Small Methods, 2026. Submitted
  4. J.-S. Ma†, S. Bang†, D.-O. Kim*, J. Oh*, and D. K. Yoon*, “Beyond Antiparallel Alignment: Chirality-Enabled Phase-Response Engineering and Beam Steering in a 160-GHz Liquid-Crystal RIS”, IEEE Trans. Antennas Propag., 2026. Submitted
  5. Jinge Guo†, Xuke Qiu†, Runchen Zhang, Qihao Han, Liangyu Deng, Yishun Lu, Zimo Zhao, Yifei Ma, Mengmeng Li, Waqas Kamal, J. Ma, Yongge Ma, Steve J Elston, Alfonso A. Castrejón-Pita, Stephen M Morris, and Chao He, “Drop-on-demand printed negative dielectric anisotropy liquid crystal droplets for adaptive complex beam manipulation and assessment”, Adv. Func. Mater., 2026. Submitted [arXiv]
  6. B. Mee, J. Ma, W. Kamal, A. A. Castrejón-Pita, S. J. Elston, W. G. Whittow, J. P. Coon, and S. M. Morris, “Reconfigurable Optically-Transparent Antenna Using Drop-on-Demand Printed Nematic Liquid Crystals”, Adv. Mater. Sci. Eng., 2026. Accepted
  7. J. Ma+*, D. Lee+, et al., “Inkjet-Printed Cholesteric Liquid Crystal Pixels with Frequency-Addressable Optical Memory for Energy-Efficient Reflective Displays”, ACS Appl. Mater. Interfaces., 2026. [Link]
  8. A. Pradeep, Y. Montelongo, J.S. Ma, et al., “From Millimeters to Microns: A Hybrid Strategy for Reconfigurable Liquid-Crystal Patterning”, Small Methods., 2026. [Link]
  9. I.-B. Kong, T.-H. Seo, J. Ma, S.-O. Cha, W.-S. Kim, and S.-W. Lee, “Isolated High-Voltage-Gain Full-Range Soft-Switching DC/DC Converter...”, IEEE Trans. Ind. Electron., 2026. [Link]
  10. J.Y. Choi, J.S. Ma, W.S. Kim*, “Tunable High-Selectivity Wideband Bandpass Filter Using Triple-Mode Stub-Loaded Resonators Based on Liquid Crystals”, IEEE Access, 2025. [Link]
  11. J. Ma, W. Kamal*, A. Pradeep, et al., “Advanced image-integrated smart windows using printed electrochromic polymer-dispersed liquid crystal droplets,” Adv. Opt. Mater., 2025. HOT TOPIC [Link]
  12. J. Ma, A. Pradeep, et al., “Operating temperature control in push-pull azobenzene-doped liquid crystal light-driven devices via a UV absorber”, Dyes and Pigments, 2025. [Link]
  13. S.-H. Lee+, S.-G. Park+, J. Ma, W.-S. Kim, and S.-W. Oh*, “High-performance switchable visor for augmented reality using low-voltage, fast-response cholesteric liquid crystals,” Dyes and Pigments, 2025. [Link]
  14. S.-O. Cha, J.-H. Ka, I.-B. Kong, J. Ma, et al., “Off-Center Rotational Dynamics in Virtual Reality: Effects on Cybersickness and Presence,” IEEE Access, 2025. [Link]
  15. A. Pradeep*, U. Mur, J. Ma, et al., “Locking metastable topological domains in nematic liquid crystal Pi cells,” Adv. Funct. Mater., 2025. Editor’s Choice [Link]
  16. J.-Y. Choi, J. Ma, and W.-S. Kim*, “Reconfigurable wideband bandpass filter using stepped impedance resonator based on liquid crystals,” Electronics, 2025. [Link]
  17. S. Park, J. Ma, S. Oh, and W. Kim, “Blur image representation in defocus using generalized Gaussian kernel,” Inf. Disp., 2025. [Link]
  18. J.-Y. Choi, J. Ma, H. Oh, and W.-S. Kim*, “Reconfigurable narrow-band bandpass filter using electrically-coupled open-loop resonators based on liquid crystals,” J. Phys. D: Appl. Phys., 2024. [Link]
  19. J.-H. Lee, J. Ma, et al., “Advanced light: Liquid crystals-based ultra-broadband polarization rotator for functional smart devices,” Small Methods, 2023. [Link]
  20. J. Ma, J.-Y. Choi, et al., “Liquid crystals for advanced smart devices with microwave and millimeter-wave applications,” Adv. Mater., 2023. Frontispiece Cover [Link]
  21. H. Shin+, J. Ma+, J.-Y. Choi+, and W.-S. Kim*, “Phase shifting enhancement of a substrate-integrated waveguide phase shifter based on liquid crystal,” Appl. Sci., 2023. [Link]
  22. J. Ma, et al., “An evaluation of surface-active agent HTAB with vertical self-alignment properties to align liquid crystals,” Appl. Sci., 2022. [Link]
  23. J. Ma, et al., “Liquid-crystal-based floating-electrode-free coplanar waveguide phase shifter for 28-GHz applications,” J. Phys. D: Appl. Phys., 2021. [Link]
  24. J. Ma, J.-Y. Choi, and W.-S. Kim, “액정의 고주파 대역 특성과 RF 응용 기술 동향,” Information Display, 2021. [Link]

International Conference Presentations

  1. H. Oh, et al., “Analysis of Meander Delay Line Liquid Crystal Phase Shifter using Director Angle Extraction,” IMID, 2024.
  2. J.-Y. Choi, J. Ma, et al., “Characterization of Nematic Liquid Crystals at 10 GHz using an Open Stub Resonator,” AP-S/URSI, 2024. [Link]
  3. J.-Y. Choi, J. Ma, et al., “Reconfigurable Phased Array Antenna Based on Liquid Crystal with Miniaturized Bandpass Filter,” ISAP, 2022. [Link]
  4. H. Shin, et al., “Phase Shift Enhancement of Substrate Integrated Waveguide Phase Shifter Using Liquid Crystal,” IMID, 2022.
  5. J. Ma, J.-Y. Choi, et al., “Comparative Analysis of Liquid-Crystal Driving in Liquid-Crystal Phase Shifters,” AP-S/URSI, 2022. [Link]
  6. J. Ma, et al., “Analysis about Novel Design of Liquid Crystal Based Floating Electrode Free Coplanar Waveguide Phase Shifter,” IMID, 2021.
  7. S. Cha, J. Ma, et al., “Concept and Numerical Modeling for Virtual Acceleration Sense on Vestibular Organ using Focused Ultrasound,” IMID, 2020.

Domestic Conference Presentations

  1. J. Ma, et al., “Liquid Crystal Printing as a Spatially Programmable Platform for Decoupled Optical Functionality,” KMID (The Korean Meeting on Information Display), 2026.
  2. J. Ma, et al., “Enhancing Light-driven Polymer Stabilized Liquid Crystal Smart Devices,” BLCS (British Liquid Crystal Society), 2024. [Link]
  3. J.-Y. Choi, J. Ma, et al., “Characterization of Nematic Liquid Crystal at 10 GHz using Director Angle Extraction,” Korea Liquid Crystal Conference, 2024.
  4. J.-Y. Choi, J. Ma, et al., “전기적 커플링 오픈 스터브를 이용한 소형 액정 기반 가변 광대역 대역저지 필터,” IEIE Summer Conference, 2023.