I am a first-year Ph.D. student at Seoul National University, advised by Prof. Gunhee Kim. Before that, I received my B.S. in CSE from POSTECH in 2025.

I am deeply interested in the limits of the thinking machine and what can and cannot be computed. Can the human mind be simulated by a machine? Currently, I am focused on building AI systems that reason with knowledge, with interests in language agents and knowledge retrieval. Looking ahead, my interests include: 1) utilizing additional forms of knowledge beyond text, 2) improving language models to address challenging known-unknowns.

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Education

Seoul National University Sep 2025-Present

M.S/Ph.D in AI

Pohang University of Science and Technology Feb 2021-Aug 2025

B.S. in Computer Science and Engineering

Summa Cum Laude

Hansung Science High School for the Gifted Mar 2018 - Feb 2021

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Publication

Hybrid Deep Searcher: Scalable Parallel and Sequential Search Reasoning

Dayoon Ko, Jihyuk Kim, Haeju Park, Sohyeon Kim, Dahyun Lee, Yongrae Jo, Gunhee Kim, Moontae Lee, Kyungjae Lee
ICLR 2026

When Should Dense Retrievers Be Updated in Evolving Corpora? Detecting Out-of-Distribution Corpora Using GradNormIR

Dayoon Ko, Jinyoung Kim, Sohyeon Kim, Jinhyuk Kim, Jaehoon Lee, Seonghak Song, Minyoung Lee, Gunhee Kim
ACL 2025 Findings [pdf] [code]

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Research Experience

Vision and Learning Lab, SNU Jan 2025–Aug 2025

Advised by Prof. Gunhee Kim

Language and Data Intelligence Lab, SNU Sep 2024–Nov 2024

Advised by Prof. Seungwon Hwang

Data Systems Lab, POSTECH Feb 2024–Aug 2024

Advised by Prof. Wookshin Han

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Work Experience

Samsung Electronics Inc. Jul 2023–Aug 2023

Internship at System RnD Team, MX Department