Yeongtak Oh (오영탁)

Hi, I'm a fourth-year Ph.D. candidate in ECE at Seoul National University, working in the DSAIL Lab. I research computer vision and multi-modal reasoning. My work primarily explores post-training of generative models. I'm deeply interested in advancing multi-modal AI systems in more expressive and personalized ways.

I received my B.S. (2018) and M.S. (2020) degrees in Mechanical Engineering from Seoul National University. In 2021, I served as a Military Science and Technology Researcher at the AI R&D Center of the Korea Military Academy.

Yeongtak Oh

News

Publications

Preprints

2026

Heads That Write, Not Just Point
Heads That Write, Not Just Point: Image Retrieval Heads in Vision-Language Models

Junsung Park, Sangwon Yu, Donghun Kang, Yeongtak Oh, Jaewon Jeong, Gyeongtae Yoo, Han Cheol Moon, Jungbeom Lee, and Sungroh Yoon

OpenReview, 2026

We introduce ICIR-MCQ, a controlled probe for analyzing in-context image retrieval in LVLMs at attention-head granularity, revealing that causally important retrieval heads must not only point to the target image but also write its information into the residual stream.

Conferences

2026

CoViP
Contextualized Visual Personalization in Vision-Language Models

Yeongtak Oh*, Sangwon Yu*, Junsung Park, Han Cheol Moon, Jisoo Mok, and Sungroh Yoon

* Equal contribution

Forty-Third International Conference on Machine Learning (ICML), 2026

We introduce CoViP, a unified framework for contextualized visual personalization in VLMs, featuring a novel personalized image captioning benchmark, an RL-based post-training scheme, and diagnostic downstream personalization tasks.

Style Friendly
Style-Friendly SNR Sampler for Style-Driven Generation

Jooyoung Choi*, Chaehun Shin*, Yeongtak Oh, Heeseung Kim, Jungbeom Lee, and Sungroh Yoon

* Equal contribution

The IEEE/CVF Winter Conference on Applications of Computer Vision (WACV), 2026

We propose the Style-friendly SNR sampler, which aggressively shifts the signal-to-noise ratio (SNR) distribution toward higher noise levels during fine-tuning to focus on noise levels where stylistic features emerge.

2025

RePIC
RePIC: Reinforced Post-Training for Personalizing Multi-Modal Language Models

Yeongtak Oh, Dohyun Chung, Juhyeon Shin, Sangha Park, Johan Barthelemy, Jisoo Mok†, and Sungroh Yoon†

† Equal corresponding

Neural Information Processing Systems (NeurIPS)

Selected as a WINNER in Qualcomm Innovation Fellowship Korea (QIFK) 2025 (Link)

We propose RePIC, a reinforced post-training framework that outperforms SFT-based methods in multi-concept personalized image captioning by enhancing visual recognition and generalization through reward templates and curated instructions.

2024

Journals

2024

2022

Talks