Park, Si Hyung (Sihyung)

SihyungPark.jpg


Ph.D. Candidate in Statistics
Department of Statistics
North Carolina State University

spark52 at ncsu dot edu


Biography

I am Sihyung Park (pronounced “See-He-Young”), a Ph.D. candidate in the Department of Statistics at North Carolina State University, co-advised by Professors Wenbin Lu, Shu Yang, and Leonard A. Stefanski. Before joining the Ph.D. program, I earned a B.S. in Life Sciences (thesis advisor: Professor Sung Wook Chi) and a B.Econ. in Statistics from Korea University, followed by an M.S. in Statistics from Seoul National University (advisor: Professor Byeong Uk Park).

My transition into statistics grew out of early experiences in ecology, including work at the Biodiversity and Ecology Lab and assessing endangered Grylloblattidae (icebugs or rock-crawlers) species for the IUCN Red List. Through this work, I recognized both the rapid shift in modern biology toward high-throughput molecular data and the central role that mathematical and statistical frameworks play in describing ecological and genetic phenomena. Seeking a deeper understanding of molecular data, I studied transcriptome-scale RNA interference at the Molecular and Computational Genomics Lab. Driven by a desire for rigorous theoretical statistics and a focus on causal mechanisms rather than associations, I transitioned into graduate training in statistics.

My research focuses on causal inference, specifically addressing unmeasured confounding and principal stratification in observational studies, as well as high-dimensional methods. Grounded in my early background in ecology and genomics, I am interested in bringing methodological insights to problems in genomics and evolutionary biology.


Education

  • North Carolina State University (Aug. 2022 - Present)
    • Ph.D candidate in Statistics
  • Seoul National University (Mar. 2020 - Feb. 2022)
    • M.S. in Statistics
    • Advisor: Byeong U. Park
  • Korea University (Mar. 2014 - Feb. 2018)
    • B.S. in Life Sciences
    • B.Econ. in Statistics (double major)
    • Summa Cum Laude
    • Advisor: Sung Wook Chi



Publications

Peer-reviewed journal articles

  • S. Park, W. Lu, S. Yang. (2026) Evaluating and Learning Optimal Dynamic Treatment Regimes under Truncation by Death, Advances in Neural Information Processing Systems, 38, 109502-109538. (link)
  • S. Park*, S. H. Ahn*, E. S. Cho*, Y. K. Cho, E. S. Jang, S. W. Chi. (2018) CLIPick: a sensitive peak caller for expression-based deconvolution of HITS-CLIP signals. Nucleic Acids Research. 46(21), 11153-11168. (link) (*equal contribution)

Preprints and manuscripts under review

  • S. Park, S. Yang, W. Ye, M. Shan. (2026) A Tutorial on Evaluating Long-Term Clinical Efficacy via External Control Integration. (Under Review)
  • S. Park, S. Yang, M. Shan, W. Ye, I. Lipkovich. (2026) Proximal Difference-in-Differences for Long-Term Causal Learning under Confounding and Outcome Drift. (Under Review)
  • S. Park, L. A. Stefanski. (2025) Non-null Shrinkage Regression and Subset Selection via the Fractional Ridge Regression, arXiv preprint arXiv:2505.23925 (link)

Technical reports

  • Chung, H.-Y., Lee, Y-W, Park, S.-H., Lim, C.-S., Park, S.-H., Hong, M.-H., Lee, Y.-S., Lee, D.-H., Shin, H.-S., Lee, S.-J., Oh, H.-K & Gwon, S.-A. (2018) Galloisiana odaesanensis. The IUCN Red List of Threatened Species 2018. (link)
  • Chung, H.-Y., Lee, Y-W, Park, S.-H., Lim, C.-S., Park, S.-H., Hong, M.-H., Lee, Y.-S., Lee, D.-H., Shin, H.-S., Lee, S.-J., Oh, H.-K & Gwon, S.-A. (2018) Galloisiana kosuensis. The IUCN Red List of Threatened Species 2018. (link)
  • Chung, H.-Y., Lee, Y-W, Park, S.-H., Lim, C.-S., Park, S.-H., Hong, M.-H., Lee, Y.-S., Shin, H.-S., Lee, S.-J., Lee, D.-H., Oh, H.-K & Gwon, S.-A. (2018) Namkungia biryongensis. The IUCN Red List of Threatened Species 2018. (link)
  • Chung, H.-Y., Lee, Y-W, Lim, C.-S., Park, S.-H., Park, S.-H., Lee, Y.-S., Hong, M.-H., Lee, S.-J., Lee, D.-H., Shin, H.-S., Oh, H.-K & Gwon, S.-A. (2018) Namkungia magnus. The IUCN Red List of Threatened Species 2018. (link)


Presentations

  • A Flexible and Robust Sensitivity Model for Principal Ignorability Violation, Eastern North American Region (ENAR) International Biometric Society, Boston, MA, USA, March 2027 (invited, forthcoming)
  • Proximal Difference-in-Differences, Eastern North American Region (ENAR) International Biometric Society, Indianapolis, IN, USA, March 16, 2026.
  • Fractional Ridge Regression, JMP R&D Seminar, Cary, NC, USA, September 18, 2025.
  • Fractional Ridge Regression, Joint Statistical Meetings (JSM), Nashville, TN, USA, August 8, 2025.
  • CLIPick: an expression-based deconvolution software for sensitive resolving of HITS-CLIP peaks, International Union of Biochemistry and Molecular Biology (IUBMB) Congress, Seoul, Korea, June 2018


Honors and Awards

  • Merck Research Fellowship - Department of Statistics, NC State University (2026)
  • Distinguished Student Paper Award - ENAR 2026 Student Paper Conpetition (2026)
  • Honorable Mention - ASA Biopharmaceutical Section 2026 Student Paper Conpetition (2026)
  • Outstanding Teaching Assistant Award - Department of Statistics, NC State University (2026)
  • Korean Government Scholarship for Study Overseas - Ministry of Education, Republic of Korea (2022-2024)
  • Academic Excellence Scholarship - Seoul National University (Fall 2020, Fall 2021)
  • Korea University Future Research Grant - Korea University (2016-2018)
  • Academic Excellence Award - Korea University (2014-2015, 2017)