KAIST EE · NTU S-Lab (MMLab)

Understanding how actions transform the physical world.

I build egocentric and embodied AI systems that reason about tool use, physical interaction, and action-driven state changes.

I am an undergraduate researcher in Electrical Engineering at KAIST and a research intern at NTU S-Lab (MMLab). My work spans tool-centric egocentric video, latent-action and world models, and 3D/4D scene understanding. I am particularly interested in connecting human video and robot experience to build models that understand not only what is visible, but how actions change the world.

Egocentric Vision Latent Action & World Models 3D/4D Vision Embodied AI
Junsu Kim
Physical interaction · Tool use
Video and world models
Updates

Recent news

Aug 2026
EgoTools was accepted to EMNLP 2026 (Main Conference)! 🎉
Feb 2026
C3G was accepted to CVPR 2026.
Jan–May 2026
Conducted research at NTU S-Lab (MMLab) under Prof. Ziwei Liu during an exchange semester in Singapore.
Research

Three connected research threads

My projects are connected by one question: how can AI understand the physical consequences of actions in real-world environments?

01
Egocentric Tool-Use Reasoning

Understanding why tools are selected, how they interact with target objects, and how physical states evolve in first-person video.

02
Latent Action & World Models

Learning action-centric representations from video priors and modeling how possible actions transform future world states.

03
3D/4D Scene Understanding

Building geometry-aware scene representations for dynamic visual understanding, reconstruction, and embodied interaction.

Publications

Selected work

1
Shulin Tian*, Junsu Kim*, Shuai Liu*, Hao Li*, Yujiao Shen, Sihan Li, Zhe Yang, Yeongon Kim, Feiyu Li, Jialin Wu, Yichi Zhang, Wenhui Wang, Runmao Yao, Yuhao Dong, Zhaoxi Chen, Fangzhou Hong, Antonino Furnari, Jingkang Yang, Hongyuan Zhu, Ziwei Liu.
EMNLP 2026 Dataset & Benchmark Egocentric Vision Tool-Use Reasoning

* Equal contribution.

Experience

Research roles

S-Lab (MMLab), NTU
Jan 2026 – Present

Research Intern · Advisor: Prof. Ziwei Liu

  • Co-led EgoTools, a 100+ hour multimodal egocentric dataset and 1K-question benchmark for tool-centric reasoning in real-world videos.
  • Designed annotation and QA workflows, coordinated data collection and quality control, and contributed to model evaluation, failure analysis, and manuscript writing.
  • Continuing follow-up research on egocentric tool use and embodied video reasoning.
Computer Vision Lab (CVLAB), KAIST AI
Jun 2025 – Present

Undergraduate Researcher · Advisor: Prof. Seungryong Kim

  • Working on video-prior-based latent action learning, with a focus on data strategy, human/robot video priors, and embodied world modeling.
  • Studied feed-forward 3D reconstruction and novel-view synthesis with Gaussian Splatting, VGGT, and NoPoSplat, and contributed analysis tools and experiments to C3G.
Video and Image Computing Lab (VICLAB), KAIST
Dec 2024 – Jun 2025

Research Intern · Advisor: Prof. Mun Churl Kim

  • Reviewed modern object detection architectures from RCNN/YOLO families to vision transformers.
  • Implemented baselines for few-shot and anomaly detection tasks.
Education

Academic background

Korea Advanced Institute of Science and Technology (KAIST)
Daejeon, South Korea
  • B.S. in Electrical Engineering
  • Mar 2021 – Expected Aug 2027
  • GPA: 4.10/4.30 · Major GPA: 4.19/4.30
Nanyang Technological University (NTU)
Singapore
  • Exchange Student, School of Electrical and Electronic Engineering
  • Jan 2026 – May 2026
Honors

Selected awards

  • KAIST Presidential Fellowship (15th) 2025 – Present
  • National Science & Engineering Scholarship for Academic Excellence 2025 – Present
  • KAIST EE Dean’s List Award Spring 2024 Awarded to the top 3% of EE students
  • KAIST Freshman Dean’s List Award Fall 2021 Awarded to the top 3% of first-year students
  • Woon Hae Scholarship (12th) 2025
  • KAIST Shared Lives Award · Top-ranked Recipient 2026
Beyond Research

Leadership & technical toolkit

Leadership: President of EERun, Google Student Ambassador, member of the Young Engineers Honor Society.

Programming: Python, C/C++, PyTorch, Git, LaTeX.

Research toolkit: video preprocessing, dataset curation, annotation pipelines, model evaluation, and 3D/vision experimentation.