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Nahyeon Park

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#artificial intelligence Preprint Oct 2026

Keep It CALM: Analyzing the Limits of Global Unsafety in Text-to-Image Generation

Training-free safeguards for text-to-image generation often rely on a reusable safety signal, such as an unsafe direction or global toxic subspace, applied broadly across prompts. We provide a controlled geometric analysis of this global-unsafety assumption and reveal a consistent coverage-selectivity trade-off: compac...

Nahyeon Park, Minhyun Lee, Hyunjung Shim · 0 citations
#artificial intelligence Review Sep 2026

CHARM: Character Hallucination for Multicultural Role Play Benchmark

Role-playing large language models (LLMs) are expected to adopt a character's style while also respecting that character's knowledge boundaries. Prior evaluations detect character hallucination but rarely distinguish whether errors arise from failure to recognize a boundary or from failure to comply despite recognition...

Su-Hyun Han, Nahyeon Park, Gaeun Seo et al. · 1 citation

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