I'm Sihyeon Ha, a Ph.D. candidate at POSTECH. I study how to deploy AI models efficiently. If you'd like to talk about any of this, feel free to email me.

Research interests

Efficient LLM Inference·KV-cache Compression·Federated Learning·Multimodal AI Serving

News

  • 2026.09KV-COBRA accepted to NeurIPS 2026.
  • 2026.09KV-COBRA preprint is on arXiv.
  • 2026.03Presented RB-LoRA at EACL 2026 in Rabat, Morocco.
  • 2026.01RB-LoRA accepted to Findings of EACL 2026.

Publications

International Conferences

  1. KV-COBRA: KV Cache Compression via Co-Optimized Bit-Rank Allocation

    Sihyeon Ha, Jaeho Lee, Yo-Seb Jeon
    NeurIPS 2026
    PDFPageProjectCode
    BibTeX
    @misc{ha2026kvcobra,
  title         = {KV-COBRA: KV Cache Compression via Co-Optimized Bit-Rank Allocation},
  author        = {Ha, Sihyeon and Lee, Jaeho and Jeon, Yo-Seb},
  year          = {2026},
  eprint        = {2609.24298},
  archivePrefix = {arXiv},
  primaryClass  = {cs.LG},
  url           = {https://arxiv.org/abs/2609.24298}
}

  2. RB-LoRA: Rank-Balanced Aggregation for Low-Rank Adaptation with Federated Fine-Tuning

    Sihyeon Ha, Yongjeong Oh, Yo-Seb Jeon
    Findings of EACL 2026
    PDFPageProjectCodeVideoDOI
    BibTeX
    @inproceedings{ha-etal-2026-rb,
  title     = "{RB}-{L}o{RA}: Rank-Balanced Aggregation for Low-Rank Adaptation with Federated Fine-Tuning",
  author    = "Ha, Sihyeon and Oh, Yongjeong and Jeon, Yo-Seb",
  booktitle = "Findings of the {A}ssociation for {C}omputational {L}inguistics: {EACL} 2026",
  month     = mar,
  year      = "2026",
  address   = "Rabat, Morocco",
  publisher = "Association for Computational Linguistics",
  pages     = "1737--1746",
  doi       = "10.18653/v1/2026.findings-eacl.88"
}
View all publications (+2)Show fewer

Domestic Conferences

  1. Activation-based Low-Rank Decomposition for LLM Compression

    활성화 기반 저랭크 분해를 활용한 대형언어모델 경량화
    Sihyeon Ha, Yo-Seb Jeon
    KICS Fall Conference 2025
    Page

  2. LoRA Aggregation under Heterogeneous Fine-Tuning

    이질적인 연합 학습 기반 미세조정을 위한 LoRA 기법
    Sihyeon Ha, Yo-Seb Jeon
    KICS Summer Conference 2025Best Paper Award
    Page

Education

  • 2024.08 – PresentIntegrated M.S./Ph.D. program, POSTECHDepartment of Electrical Engineering
  • 2023.03 – 2024.03Exchange Student, University of StuttgartElectrical Engineering and Information Technology
  • 2020.02 – 2024.08B.S. in Electrical Engineering, POSTECH

Experience

  • 2023.08 – 2024.01Research Intern, Fraunhofer IPA, StuttgartImage processing and machine learning

Honors & Awards

  • 2025.06Best Paper Award, KICS Summer Conference
  • 2025 – 2026Master's Student Research Grant, National Research Foundation of Korea (NRF)
  • 2024.08Highest Honor (Proud POSTECHIAN), POSTECH
  • 2023Undergraduate Thesis Award (Best Capstone Design), POSTECH
  • 2022Member, Young Engineers Honor Society (YEHS), National Academy of Engineering of Korea

Outside the lab

Indoors, I play the oboe and the guitar. Outdoors, I freedive and scuba dive (AIDA Level 2, PADI Advanced Open Water).