My research has been driven by two primary keywords: HPC and Scalable, Secure AI.
Jiheon Choi (μ΅μ§ν) received a B.S. degree in Software and Computer Engineering from Ajou University in Suwon, South
Korea in August 2023.
Currently, I am a Ph.D. student in the Department of Artificial Intelligence at Ajou University.
I am a software engineer with with over five years of experience in both academic research and industry
applications.
I am a member of the Distributed and Parallel Computing Lab, led by Ph.D. Sangyoon Oh. My research interests include high-performance computing, distributed
systems, and application security. You can contact me via email at unidev@ajou.ac.kr.
- High-Performance & Distributed Computing: HPC System Configuration and Job Scheduling
- AI & Machine Learning: Distributed ML Architecture (i.e., Distributed LLM and GNN), Federated Learning
and Privacy-Preserving ML Techniques, Machine Learning for Resource Optimization
- Security & Privacy: Differential Privacy and Homomorphic Encryption, Automatic Security Vulnerability
Assessment, Secure ML Systems Design
News
π Sep 2025. A paper accepted at Journal of Systems Architecture.
π Feb 2025. I presented a paper at the HPC Asia conference on a titled "When HPC Scheduling Meets Active Learning: Maximizing Performance with Minimal Data."
Education
- Ph.D. degree in Department of Artifical Intelligence at Ajou University. Advised by Ph.D. Sangyoon Oh. Sep. 2023 -
now
- B.S. degree in Department of Software and Computer Engineering at Ajou University. Mar. 2019 - Aug. 2023
Publications Google Scholar
C: conferences, J: journals, W: workshops, P: preprints
2026
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[C4] Jiheon Choi, Sangyoon Oh. [In progress] Anonymous Title (HPC-related topic). To be update.
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[C3] Im Jinhee, Taeyoung Yun, Jiheon Choi, Minsol Choo, Sangyoon Oh, Hyunsouk Cho. Anonymous Title (Under Review). To be update.
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[C2] Jiheon Choi, Hyeokjun Jeong, Chanhyeok Jo, Hyunsouk Cho, Sangyoon Oh. Anonymous Title (Under Review). To be update.
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[J3] Jiheon Choi, Sangyoon Oh. Anonymous Title (Under Review). Journal of Supercomputing.
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2025
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[J2] Jiheon Choi, Sangyoon Oh. Lightweight Multi-Layered De-Identification Architecture: Secure Client Selection in Federated Learning. Journal of Systems Architecture (IF 4.1, JCR Q1). [pdf]
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[C1] Jiheon Choi, Jaehyun Lee, Minsol Choo, Taeyoung Yoon, Oh-Kyoung Kwon, Sangyoon Oh. When HPC Scheduling Meets Active Learning: Maximizing The Performance with Minimal Data. HPCAsia 2025: High Performance Computing in Asia-Pacific Region. [pdf]
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2024
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[J1] Miri Yu, Jiheon Choi, Jaehyun Lee, Sangyoon Oh. Staleness Aware Semi-asynchronous Federated Learning. Journal of Parallel and Distributed Computing (JPDC) (IF: 4.0, JCR Q1). [pdf]
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Domestic Publications (in Korean)
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- Sergio P. Caetano, Miri Yu, Jiheon Choi, Sangyoon Oh. Dynamic Programming-Based Multilevel Graph Partitioning for Large-Scale Graph Data, νκ΅ν΅μ νν λκ³νμ λν 2024 [link]
- Hyunsuk Jung, Jiheon Choi, Jongwon Park, Sehee Baek, Sangyoon Oh. Conditional LSTM-VAE-based Data Augmentation for Disaster Classification Prediction, The 9th International Conference on Next Generation Computing (ICNGC 2023) [link]
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Patents
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[P5] Jiheon Choi, Sangyoon Oh. Method and Apparatus for Classifying Workload Using Artificial Intelligence Model. South Korea 10-2023-0029398 (Applied)
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[P4] Jiheon Choi, Sangyoon Oh. Apparatus and Method for Hotspot Prevention Based on Bloom Filter in Distributed Database Management System. South Korea 10-2024-0162896 (Applied)
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[P3] Jiheon Choi et al. System and Method for Detecting Dynamic Web Vulnerability of Data Normalization of HTTP Headers for Classification of HTTP Headers. South Korea 10-2024-0159333 (Applied)
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[P2] Jiheon Choi et al. Method for Automatic Diagnosis Vulnerability of Web and Apparatus for Performing The Method. South Korea 10-2311119 (Registered)
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[P1] Jiheon Choi et al. System and Method for Analyzing Alamalicious Code Based on Blockchain. South Korea 10-222804 (Registered)
Work and Research Experience
- Lead Software and Security Engineer, MONTHLY HACKING Inc., Seoul, Republic of Korea (Aug 2020 - Dec 2023)
- Co-founded the company with a non-technical partner and jointly led operations, while personally directing the technical R&D division and providing essential technical expertise for all strategic business decisions.
- Delivered high-impact security consulting to well-known domestic startups (approximately 60+), uncovering critical vulnerabilities through penetration testing and providing rapid incident response during security breaches (e.g., penetration testing, vulnerability assessment, and incident response).
- Engineered a sophisticated REST API for an automated penetration testing SaaS platform that transformed manual security processes into scalable solutions, enabling protection of enterprise-level systems with startup-sized security teams.
- Researcher, WAPAS SYSTEMS Inc., Incheon, Republic of Korea (Oct 2019 - Aug 2020)
- Developed new research initiatives on mobile operating system security architectures (Android and iOS), including innovative bypass methodologies that significantly improved application functionality and secured new project funding.
- Implemented a web application for a Philippine water shop that included both customer-facing ordering platform and robust administrative backend, after skillfully obtaining precise business requirements through effective stakeholder communication and translating complex operational needs into technical solutions that streamlined their entire water delivery service.
- Other Experience
- BSKB's Summer Patent Seminar, Birch, Stewart, Kolasch & Birch, LLP (Jun 2023): β Completed comprehensive training on U.S. patent law, including patent prosecution and litigation strategies, recent legal developments, and case studies at this prestigious annual legal seminar.
Research Projects
- [KISTI Β· National Research Council of Science and Technology] A Study on Graph Parallel Processing Algorithm Based on GPU. June 2024 - now
- [Ministry of Science and ICT] Development of multi-tiered, multi-purpose autotuning framework for exa-scale supercomputers. Nov 2023 - now
- [Samsung Display Inc.] Development of High Efficiency HPC Job Scheduling Algorithm. Jan 2024 - Feb 2025
- [Korea Automotive Technology Institute] Development of Safety of the intended functionality from insufficiency of perception and decision making. Sep 2022 - now
- [IITP] AI Application Technology with MR-IoT Convergence to countermeasure Disasters. Jan 2023 - Dec 2023
- [Ajou University] User Engagement in Social/Mobile Platforms and Its Welfare Value. Jan 2022 - Oct 2022
- [Ministry of SMEs and Startups] Development of Web Application Vulnerability Assessment Software. Apr 2022 - Dec 2022
Services
- Teaching Assistant, Ajou University. Jan 2022 - now
- Distributed and Parallel Computing: Fall 2025
- Object-oriented Programming: Spring 2024, Spring 2025
- Web System Design: Fall 2023, Fall 2024
- Artificial Intelligence Convergence Capstone Design: Fall 2022, Spring 2023
- Data AnalyticsβMachine Learning: Spring 2022
- Mentor, Developer Bootcamp Mentoring
- Team Sparta Inc. (Jul 2022 - May 2023): React, Node.js
- Coach, Elice Inc. (Nov 2021 - Aug 2022): React, Node.js
- Mentor, Korea Open Source Software Association (Oct 2020 - now)
- Provided mentoring for the Open Source Software Developer Competition hosted by the Ministry of Science
and ICT.
- Instructor, Korea Information Technology Research Institute (Aug 2021 - Dec 2021)
- Conducted lectures on essential hacking techniques, encompassing web, mobile, and system hacking domains.
Furthermore, delivered a lecture on ethical hacking best practices to participants. The βCyber Guardiansβ
program is specifically designed for high school students who aspire to initiate their learning journey in
the field of information security.
Last updated: Oct 2025