Author

Juhwan Choi

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#artificial intelligence Preprint Sep 2026

ChronoFlow: Hierarchical Flow Matching for Irregular Time Series Generation

Recent advances in generative modeling have substantially improved time series generation, yet most existing methods either assume a regular temporal grid or focus on feature dynamics under a given sampling structure. This makes them illsuited for generating irregular time series in their native form, where a model mus...

Changhun Kim, S. Jang, Jeongjun Lee et al. · 0 citations

#artificial intelligence Preprint Aug 2026

Not Safe for All: Auditing the Dialect Penalty in Text-to-Image Safety Pipelines

Text-to-image safety guardrails fail to generalize equitably to non-standard dialects, formalized as the dialect penalty, where filters trigger based on linguistic surface features rather than semantic intent, and is mitigable via group-balanced retraining.

Minkyu Kim, Juhwan Choi, Youngbin Kim · 0 citations