About

About

Jinseok Ryu, PhD

[Email] jinseuk56@gmail.com
[Email] jinseuk56@snu.ac.kr
[Github] https://github.com/jinseuk56
[LinkedIn] https://www.linkedin.com/in/j-ryu/
[ORCID] https://orcid.org/0000-0002-9558-3469

🔸Education

PhD | Mar 1, 2017 → Aug 29, 2022

Combined MS/PhD Course
Advisor: Prof. Miyoung Kim
Materials Science and Engineering
Seoul National University

BS | Mar 1, 2009 → Aug 28, 2015

Materials Science and Engineering
Seoul National University

🔸Professional Experience

Research Associate Professor | Mar 1, 2026 → Present

Research Institute of Advanced Materials (RIAM)
Seoul National Unversity (Seoul, South Korea)

Postdoctoral Research Associate | Mar 4, 2024 → Jan 30, 2026

electron Physical Science Imaging Centre (ePSIC)
Diamond Light Source (Didcot, United Kingdom)
Funded by the InFUSE Prosperity Partnership

Postdoctoral Research Associate | Sep 1, 2022 → Feb 29, 2024

Research Institute of Advanced Materials (RIAM)
Seoul National University (Seoul, South Korea)

Semiconductor Engineer | Jul 1, 2015 → Jul 19, 2016

SK Hynix (Icheon-si, Gyeonggi-do, South Korea)

Military Service | Apr 26, 2010 → May 6, 2012

Hornorable Discharge
Republic of Korea Air Force (Seoul, South Korea)

🔸Teaching Experience

28th TEM Workshop | Jul 20, 2023

Korean Society of Microscopy
Lecture Title: Machine learning in TEM analysis: basics and applications

27th TEM Workshop | Jul 28, 2022 → Jul 29, 2022

Korean Society of Microscopy
Lecture Title: STEM-derived multi-dimensional data processing in Python-integrated GMS3

Fundamentals of Computer Science | Sep 1, 2020 → Dec 31, 2020

Department of Materials Science and Engineering
Seoul National University

🔸Skills

(S)TEM Experiment and Analysis

  • Capable of acquiring microscopy data using (Cs-corrected) TEMs including ARM300CF, ARM200CF, JEM-2100F (JEOL), Themis Z and Tecnai F20 (Thermo Fisher)
  • Experienced in advanced (S)TEM imaging and spectroscopy experiments, including 4-dimensional STEM (4D-STEM), differential phase contrast STEM (DPC-STEM) and electron energy loss spectroscopy (EELS)
  • Experienced in analyzing the structure-property relationship of materials through (S)TEM
    • Battery materials (solid electrolyte interphase), photovoltaic materials (lead halide perovskites), catalytic/plasmonic nanoparticles (gold, transition metal oxide), amorphous materials (IGZO, gallium oxide, carbon), functional oxide memories (tantalum/hafnium oxides), light emitting materials (gallium nitride, lead halide perovskite)
    • STEM/EDS/EELS tomography
    • 4D-STEM analysis (virtual imaging/RDF/FEM/DPC/ptychography)
    • Atomic structure & structural defect analysis including amorphous structure analysis [radial distribution function (RDF) & fluctuation electron microscopy (FEM)]
    • in-situ TEM experiments and analysis
    • Electronic structure & quantitative chemical analysis through EELS and EDS

Methodology Development for Microscopy Data Analysis

  • Experienced in programming using Python language and DM scripting for (S)TEM analysis (Link)
    • Developing programs for feature extraction from microscopy-derived big datasets using various machine learning algorithms, including supervised/unsupervised learning based on deep neural networks (Link)
    • Developing programs for electron/EELS tomography (Link)
    • Developing programs for 4D-STEM data processing and analysis (Link)
  • Experienced in hardware communication and measurement automation (Link)
    • Developing a concurrent acquisition system of different modalities (4DSTEM and EDX)
    • Developing an automated measurement system

🔸Publication

(†: first author or co-first authors, *: corresponding author)

  • Choi, S.†, Lim, Y.†, Guha, P., Kim, H., Kim, J., Kim, S., Harder, R., Cha, W., Suh, H., Ryu, J., Yang, S., Ji, H. I.*, Kwon, D. H.*, & Kim, H.* (2026). Dynamics of dislocation formations and their impacts on exsolution in Ru-doped perovskite oxide. Nature Communications. https://doi.org/10.1038/s41467-026-73457-7
  • Lee, S.†, Kim, S.†, Ryu, J.†, Lee, J., Hong, J., Kim, J. E., Cha, J.-Y., Shin, Y., Kwon, D., Yoon, J. H., Park, M. H., Kim, M.*, Lee, S.-Y.* (2026). In situ transmission electron microscopy visualization of electric-field-induced phase transitions at the morphotropic phase boundary in Hf0.5Zr0.5O2. ACS Nano. https://doi.org/10.1021/acsnano.5c15856
  • Zeng, Q.†, Zhao, Y., Park, S., Zhou, H., Shim, H.-J., Li, T., Ryu, J., Sung, M.-J., Chua, X. W., Yoon, E., Lewis, B. A. I., Woo, S.-J., Forzatti, M., Kim, M. J., Kim, E. A., Dai, L., Jang, J., Tang, Y., Kweon, J. J.,…Lee, T.-W.* (2026). A hierarchical shell locks and stabilizes perovskite nanocrystals with near-unity quantum yield. Science, 391(6782), 6782. https://doi.org/10.1126/science.ady1370.
  • Topping, N.†*, Bridges, J. C., Hicks, L. J., Petera, L., Allen, C. S., Ryu, J., Hopkinson, D. G., Danaie, M., Blase, L., Willcocks, F. M., Douglas, G., Changela, H. G., Noguchi, T., Matsumoto, T., & Miyake, A. (2025). Sulfur‐bearing serpentine in carbonaceous chondrites. Meteoritics & Planetary Science. https://doi.org/10.1111/maps.70069
  • Hein, P.†, Romstadt, T., Draber, F., Ryu, J., Böger, T., Falkenstein, A., Kim, M., & Martin, M.* (2025). Variable‐range hopping conduction in amorphous, non‐stoichiometric gallium oxide. Advanced Electronic Materials, 11(4). https://doi.org/10.1002/aelm.202400407
  • Kim, I.†, Ryu, J., Lee, E., Lee, S., Lee, S., Suh, W., Lee, J., Kim, M., Oh, H. s., & Yi, G.-C.* (2024). Molecular beam epitaxial In2Te3 electronic devices. NPG Asia Materials, 16(1). https://doi.org/10.1038/s41427-024-00578-0
  • Jo, J.†, Ryu, J.†, Huh, J. H., Kim, H., Seo, D. H., Lee, J., Kwon, M., Lee, S.*, Nam, K. T.*, & Kim, M.* (2024). Direct three-dimensional observation of the plasmonic near-fields of a nanoparticle with circular dichroism. ACS Nano, 18(47), 32769-32780. https://doi.org/10.1021/acsnano.4c10677
  • Park, S.†, Jang, T.†, Choi, S.†, Lee, Y. H., Cho, K. H., Lee, M. Y., Seo, H., Lim, H. K., Kim, Y., Ryu, J., Im, S. W., Kim, M. G., Park, J. S., Kim, M., Jin, K., Kim, S. H., Park, G. S., Kim, H., & Nam, K. T.* (2023). Iridium-cooperated, symmetry-broken manganese oxide nanocatalyst for water oxidation. Journal of the American Chemical Society , 145(49), 26632-26644. https://doi.org/10.1021/jacs.3c07411
  • Kim, S.†, Kim, U.-g., Ryu, J., Kim, D., Kim, M., Joo, Y.-C., & Lee, S.-Y.* (2023). Boron-doped amorphous carbon deposited by DC sputtering for a hardmask: Microstructure and dry etching properties. Applied Surface Science, 637. https://doi.org/10.1016/j.apsusc.2023.157895
  • Oh, J.†, Lee, S. Y., Kim, H., Ryu, J., Gil, B., Lee, J., & Kim, M.* (2022). Overcharge-induced phase heterogeneity and resultant twin-like layer deformation in lithium cobalt oxide cathode for lithium-ion batteries. Advanced Science, 9(32), e2203639. https://doi.org/10.1002/advs.202203639
  • Yoon, S.†, Seo, H., Jin, K., Kim, H. G., Lee, S. Y., Jo, J., Cho, K. H., Ryu, J., Yoon, A., Kim, Y. W., Zuo, J. M., Kwon, Y. K., Nam, K. T., & Kim, M.* (2022). Atomic reconstruction and oxygen evolution reaction of Mn3O4 nanoparticles. Journal of the Physical Chemistry Letters, 13(35), 8336-8343. https://doi.org/10.1021/acs.jpclett.2c01638
  • Ryu, J.†, Lee, S.†, Kim, S., Joo, Y.-C., & Kim, M.* (2022). Correlative study between the local atomic and electronic structures of amorphous carbon materials via 4D-STEM and STEM-EELS. Applied Physics Letters, 121(4). https://doi.org/10.1063/5.0100925
  • Ryu, J.†, Kim, H., Kim, R. M., Kim, S., Jo, J., Lee, S., Nam, K. T., Joo, Y. C., Yi, G. C., Lee, J., & Kim, M.* (2021). Dimensionality reduction and unsupervised clustering for EELS-SI. Ultramicroscopy, 231, 113314. https://doi.org/10.1016/j.ultramic.2021.113314

🔸Conference & Award

(†: presenter, *: corresponding author)

  • (Oral Presentation) Ryu, J.†, AA. Sheader, M. Danaie, DG. Hopkinson, KE. MacArthur, NK. Noel, and CS. Allen*, “Concurrent Acquisition of Many 4DSTEM-EDX Data Pairs and Effective Data Analysis Workflow for Beam-sensitive Materials”, EMAG 2025, Manchester, United Kingdom (2025)
  • (Oral Presentation) Ryu, J.†, AA. Sheader, M. Danaie, DG. Hopkinson, KE. MacArthur, NK. Noel, and CS. Allen*, “Automation of Simultaneous 4DSTEM-EDX Acquisition and Data Analysis for Beam-sensitive Materials”, 13th Asia Pacific Microscopy Congress, Brisbane, Queensland, Australia (2025)
  • (Oral Presentation) Lee, S.†, J. Ryu, S. Lee, P. Hein, M. Martin, Y. Kim, M. Kim*, “Mapping Electrical Properties Using STEM-EBIC for Electric Field-Induced Resistance Changes in Amorphous Gallium Oxide”, 13th Asia Pacific Microscopy Congress, Brisbane, Queensland, Australia (2025)
  • (Oral Presentation) Lee, S.†, J. Ryu, H. Philipp, M. Martin, M. Kim*, “In-Situ Biasing TEM Analysis of Resistive Switching in Amorphous GaOx for Next-Generation Memory Applications”, 2024 Materials Research Society Fall Meeting, Boston, Massachusetts, United States (2024)
  • (Oral Presentation) Chang, Y.†, J. Ryu, H. Yoo, H. N. Han, M. Kim*, “Ptychography Optimization for Atomic Analysis of Bending Mode in Bilayer Transition Metal Dichalcogenide Translational Motion”, 17th European Microscopy Congress, Copenhagen, Denmark (2024)
  • (Oral Presentation) Ryu, J.†, J. Jo, H. Kim, K. T. Nam, M. Kim*, “GPU-based fast reconstruction and DL-based feature extraction for EELS tomography”, 20th International Microscopy Congress, Busan, South Korea (2023)
  • (Invited talk) Ryu, J.† (on behalf of Prof. Miyoung Kim), G. Kim, S. Lee, M. Kim*, “Exploring ionic migration and structural evolution in dielectric devices”, 20th International Microscopy Congress, Busan, South Korea (2023)
  • (Oral Presentation) Ryu, J.†, S. Lee, S. Kim, Y.-C. Joo, M. Kim*, “A comprehensive nanoscale characterization of amorphous carbon films through STEM-EELS and 4D-STEM”, 20th International Microscopy Congress, Busan, South Korea (2023)
  • (Oral Presentation) Lee, S.†, J. Ryu., S. Y. kim, G. Park, S. D. Hyun, S. Y. Yang, M. Kim*, “Revealing the Resistive Switching Mechanism in Transition Metal Oxide Film Using In-situ Biasing TEM”, 20th International Microscopy Congress, Busan, South Korea (2023)
  • (Poster presentation) Jo, J.†, J. Ryu., M. Kim*, “Unraveling surface plasmon peak splitting in silver nanoparticles decorated on ZnO nanorods via monochromated STEM EELS tomography”, 20th International Microscopy Congress, Busan, South Korea (2023)
  • (Invited talk) Ryu, J.†, J. Jo, S. Lee, M. Kim, “Unsupervised learning strategies for extracting features from STEM-derived multi-dimensional data”, 2023 Korea Society of Microscopy Spring Conference, Daejeon, South Korea (2023)
  • (Poster presentation) Ryu, J.†, S. Lee, S. Kim, I. Yoo, Y.-C. Joo, M. Kim*, “A machine-learning approach to characterization of amorphous materials with EELS-SI and 4D-STEM”, 2022 Materials Research Society Spring Meeting, Hawaii, United States (2022)
  • (Poster presentation) Jo, J.†, K. MacArthur, J. Ryu, H. Kim, S. Collins, K. Müller-Caspary, K. Nam, M. Kim, R. E. Dunin-Borkowski*, “Three-dimensional characterization of nanoparticles with simultaneously acquired bright-field, dark-field, and secondary electron signals in STEM”, PICO 2021, Virtual conference, (2021)
  • (Oral presentation) Ryu, J., J. Jo, J. Lee†, M. Kim*, “Feature extraction and reconstruction of electron energy loss spectroscopy by non-negative matrix factorization”, 12th Asia Pacific Microscopy Congress, Hyderabad, India (2020)
  • Excellence Prize, Best Paper Award, Seoul National University & Samsung Electronics R&DB Foundation, South Korea (2021)