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Yein Park

5 accepted papers

2025

Assessing LLM Reasoning Steps via Principal Knowledge Grounding

EMNLP 2025

Step-by-step reasoning has become a standard approach for large language models (LLMs) to tackle complex tasks. While this paradigm has proven effective, it raises a fundamental question: How can we verify that an LLM’s reasoning is accurately grounded in knowledge? To address this question, we intr

2025

ChroKnowledge: Unveiling Chronological Knowledge of Language Models in Multiple Domains

ICLR 2025poster

Large language models (LLMs) have brought significant changes to many aspects of our lives. However, assessing and ensuring their chronological knowledge remains challenging. Existing approaches fall short in addressing the temporal adaptability of knowledge, often relying on a fixed time-point view…

2025

Does Time Have Its Place? Temporal Heads: Where Language Models Recall Time-specific Information

ACL 2025long

While the ability of language models to elicit facts has been widely investigated, how they handle temporally changing facts remains underexplored. We discover Temporal Heads, specific attention heads that primarily handle temporal knowledge, through circuit analysis. We confirm that these heads are…

2025

Rationale-Guided Retrieval Augmented Generation for Medical Question Answering

NAACL 2025long

Large language models (LLM) hold significant potential for applications in biomedicine, but they struggle with hallucinations and outdated knowledge.While retrieval-augmented generation (RAG) is generally employed to address these issues, it also has its own set of challenges: (1) LLMs are vulnerabl…