Papers by Hyejin Park
Semantic Exploration with Adaptive Gating for Efficient Problem Solving with Language Models (2025.acl-long)
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| Challenge: | Existing methods for multi-step reasoning suffer from inefficiency and redundancy . existing methods neglect the diversity of task difficulties leading to extensive searches even for easy tasks . |
| Approach: | They propose a method that explores reasoning paths with a gating mechanism that decides whether to conduct a tree search based on the confidence level of answers from a previous simple reasoning method. |
| Outcome: | The proposed method significantly improves accuracy by 4.3% on average while requiring only 31% of computational costs. |
A Linguistics-Aware LLM Watermarking via Syntactic Predictability (2026.acl-long)
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| Challenge: | a central challenge remains balancing text quality against detection robustness. |
| Approach: | They propose a framework that aligns watermark strength with linguistic degrees of freedom . they use part-of-speech models to weaken the signal in grammatically constrained contexts . |
| Outcome: | The proposed framework outperforms existing methods in linguistic indeterminacy tests on languages . it weakens the watermark strength in grammatically constrained contexts and strengthens it in contexts with greater linguistic flexibility. |
Retrieval-Augmented Generation with Estimation of Source Reliability (2025.emnlp-main)
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| Challenge: | Retrieval-Augmented Generation (RAG) is an effective approach to enhance the factual accuracy of large language models (LLMs). |
| Approach: | They propose a multi-source RAG framework that estimates the reliability of sources and prioritizes highly reliable and relevant documents. |
| Outcome: | The proposed framework outperforms baselines in scenarios with heterogeneous source reliability while scaling efficiently as the number of sources increases. |