Most Pseudo-copy Languages Are Not Context-Free. - Hyunjoon Cheon; Joonghyuk Hahn; Yo-Sub Han; Sang-Ki Ko (COCOON, 2021)

Self-Training using Rules of Grammar for Few-Shot NLU. - Joonghyuk Hahn; Hyunjoon Cheon; Kyuyeol Han; Cheongjae Lee; Junseok Kim; Yo-Sub Han (EMNLP (Findings), 2021)

Boosting Code Summarization by Embedding Code Structures. - Jikyoeng Son; Joonghyuk Hahn; HyeonTae Seo; Yo-Sub Han (COLING, 2022)

GDA: Grammar-based Data Augmentation for Text Classification using Slot Information. - Joonghyuk Hahn; Hyunjoon Cheon; Elizabeth Orwig; Su-Hyeon Kim; Sang-Ki Ko; Yo-Sub Han (EMNLP (Findings), 2023)

ATHENA: Mathematical Reasoning with Thought Expansion. - JB. Kim; Hazel Kim; Joonghyuk Hahn; Yo-Sub Han (EMNLP, 2023)

M-equivalence of Parikh Matrix over a Ternary Alphabet. - Joonghyuk Hahn; Hyunjoon Cheon; Yo-Sub Han (CIAA, 2023)

SuperST: Superficial Self-Training for Few-Shot Text Classification. - Ju Hyoung Lee; Joonghyuk Hahn; Hyeon-Tae Seo; Jiho Park 002; Yo-Sub Han (LREC/COLING, 2024)

Universal Rewriting Rules for the Parikh Matrix Injectivity Problem. - Ingyu Baek; Joonghyuk Hahn; Yo-Sub Han; Kai Salomaa (DLT, 2024)

CodeComplex: A Time-Complexity Dataset for Bilingual Source Codes. - Seung-Yeop Baik; Mingi Jeon; Joonghyuk Hahn; Jungin Kim; Yo-Sub Han; Sang-Ki Ko (CoRR, 2024)

On the Decidability of Infix Inclusion Problem. - Hyunjoon Cheon; Joonghyuk Hahn; Yo-Sub Han (Theory Comput. Syst., 2024)

TCProF:Time-Complexity Prediction SSL Framework. - Joonghyuk Hahn; Hyeseon Ahn; Jungin Kim; Soohan Lim; Yo-Sub Han (NAACL (Long Papers), 2025)

Advanced code time complexity prediction approach using contrastive learning. - Shinwoo Park; Joonghyuk Hahn; Elizabeth Orwig; Sang-Ki Ko; Yo-Sub Han (Eng. Appl. Artif. Intell., 2025)

URECA: The Chain of Two Minimum Set Cover Problems exists behind Adaptation to Shifts in Semantic Code Search. - Seok-Ung Choi; Joonghyuk Hahn; Yo-Sub Han (CoRR, 2025)

AmpleHate: Amplifying the Attention for Versatile Implicit Hate Detection. - Yejin Lee; Joonghyuk Hahn; Hyeseon Ahn; Yo-Sub Han (CoRR, 2025)