Publications

2026

1. TSE

   Self-Admitted GenAI Usage in Open-Source Software

   Tao Xiao, Youmei Fan, Fabio Calefato, and 4 more authors

   IEEE Transactions on Software Engineering, 2026

   DOI Bib HTML

   @article{xiao2026selfadmitted,
     title = {Self-Admitted GenAI Usage in Open-Source Software},
     author = {Xiao, Tao and Fan, Youmei and Calefato, Fabio and Treude, Christoph and Kula, Raula Gaikovina and Hata, Hideaki and Baltes, Sebastian},
     journal = {IEEE Transactions on Software Engineering},
     volume = {52},
     number = {6},
     pages = {1891-1910},
     year = {2026},
     doi = {10.1109/TSE.2026.3681886},
     url = {https://doi.org/10.1109/TSE.2026.3681886},
     dimensions = {true},
   }

2. MSR

   How AI Coding Agents Communicate: A Study of Pull Request Characteristics and Human Review Responses

   Kan Watanabe, Rikuto Tsuchida, Takahiro Monno, and 5 more authors

   In Proceedings of the 23rd IEEE/ACM International Conference on Mining Software Repositories (MSR), 2026

   DOI Bib

   @inproceedings{watanabe2026how,
     title = {How AI Coding Agents Communicate: A Study of Pull Request Characteristics and Human Review Responses},
     author = {Watanabe, Kan and Tsuchida, Rikuto and Monno, Takahiro and Huang, Bin and Yamasaki, Kazuma and Fan, Youmei and Shimari, Kazumasa and Matsumoto, Kenichi},
     booktitle = {Proceedings of the 23rd IEEE/ACM International Conference on Mining Software Repositories (MSR)},
     pages = {878-882},
     year = {2026},
     doi = {10.1145/3793302.3793593},
   }

3. MSR

   Why Are Agentic Pull Requests Merged or Rejected? An Empirical Study

   Sien Reeve Ordonez Peralta, Fumika Hoshi, Hironori Washizaki, and 8 more authors

   In Proceedings of the 23rd IEEE/ACM International Conference on Mining Software Repositories (MSR), 2026

   DOI Bib

   @inproceedings{peralta2026why,
     title = {Why Are Agentic Pull Requests Merged or Rejected? An Empirical Study},
     author = {Peralta, Sien Reeve Ordonez and Hoshi, Fumika and Washizaki, Hironori and Ubayashi, Naoyasu and Kondo, Inase and Higo, Yoshiki and Mukai, Hiroki and Yoshida, Norihiro and Kusama, Kazuki and Tanaka, Hidetake and Fan, Youmei},
     booktitle = {Proceedings of the 23rd IEEE/ACM International Conference on Mining Software Repositories (MSR)},
     pages = {787-791},
     year = {2026},
     doi = {10.1145/3793302.3793575},
   }

4. IDE

   Forecasting Developer Environments with GenAI: A Research Perspective

   Raula Gaikovina Kula, Christoph Treude, Xing Hu, and 28 more authors

   In Proceedings of the 3rd ACM/IEEE International Workshop on Integrated Development Environments (IDE), 2026

   DOI Bib

   @inproceedings{kula2026forecasting,
     title = {Forecasting Developer Environments with GenAI: A Research Perspective},
     author = {Kula, Raula Gaikovina and Treude, Christoph and Hu, Xing and Baltes, Sebastian and Barr, Earl T. and Blincoe, Kelly and Calefato, Fabio and Chen, Junjie and Cheong, Marc and Fan, Youmei and German, Daniel M. and Gerosa, Marco and Guo, Jin L.C. and Hayashi, Shinpei and Hirschfeld, Robert and Holmes, Reid and Huo, Yintong and Kobayashi, Takashi and Lanza, Michele and Liu, Zhongxin and Nourry, Olivier and Novielli, Nicole and Poshyvanyk, Denys and Saito, Shinobu and Shimari, Kazumasa and Steinmacher, Igor and Wessel, Mairieli and Wagner, Markus and Vella, Annie and Williams, Laurie and Xia, Xin},
     booktitle = {Proceedings of the 3rd ACM/IEEE International Workshop on Integrated Development Environments (IDE)},
     pages = {1-5},
     year = {2026},
     doi = {10.1145/3786151.3788604},
   }

5. SEN

   Report on BRIdging the Divides with Globally Engineered Software (BRIDGES) 2026

   Raula Gaikovina Kula, Youmei Fan, Benson Mirou, and 1 more author

   ACM SIGSOFT Software Engineering Notes, 2026

   DOI Bib

   @article{kula2026bridges,
     title = {Report on BRIdging the Divides with Globally Engineered Software (BRIDGES) 2026},
     author = {Gaikovina Kula, Raula and Fan, Youmei and Mirou, Benson and Kula, Winifred},
     journal = {ACM SIGSOFT Software Engineering Notes},
     volume = {51},
     number = {3},
     pages = {26-28},
     year = {2026},
     doi = {10.1145/3820786.3820793},
   }

6. SIML

   On the Usage of Emojis to Signal Activism in GitHub Repositories

   Amri Zadi Hudaya, Youmei Fan, Raula Gaikovina Kula, and 2 more authors

   In 2026 International Conference on Smart Computing, IoT, and Machine Learning (SIML), 2026

   DOI Bib

   @inproceedings{hudaya2026emojis,
     title = {On the Usage of Emojis to Signal Activism in GitHub Repositories},
     author = {Hudaya, Amri Zadi and Fan, Youmei and Kula, Raula Gaikovina and Nugroho, Yusuf Sulistyo and Matsumoto, Kenichi},
     booktitle = {2026 International Conference on Smart Computing, IoT, and Machine Learning (SIML)},
     pages = {1-6},
     year = {2026},
     doi = {10.1109/SIML69834.2026.11621497},
   }

7. IEICE

   Should Maintainers Deploy to Cross-Ecosystems? An Analysis of Packages from PyPI and NPM

   Lenz Nerit, Youmei Fan, Benson Mirou, and 2 more authors

   IEICE Transactions on Information and Systems, 2026

   DOI Bib

   @article{nerit2026cross,
     title = {Should Maintainers Deploy to Cross-Ecosystems? An Analysis of Packages from PyPI and NPM},
     author = {Nerit, Lenz and Fan, Youmei and Mirou, Benson and Matsumoto, Kenichi and Kula, Raula Gaikovina},
     journal = {IEICE Transactions on Information and Systems},
     volume = {E109.D},
     number = {3},
     pages = {317-324},
     year = {2026},
     doi = {10.1587/transinf.2025MPP0001},
   }

8. IEEE Software

   How Natural Language Proficiency Shapes Generative AI Code for Software Engineering Tasks

   Ruksit Rojpaisarnkit, Youmei Fan, Kenichi Matsumoto, and 1 more author

   IEEE Software, 2026

   DOI Bib

   @article{11207696,
     author = {Rojpaisarnkit, Ruksit and Fan, Youmei and Matsumoto, Kenichi and Kula, Raula Gaikovina},
     journal = {IEEE Software},
     title = {How Natural Language Proficiency Shapes Generative AI Code for Software Engineering Tasks},
     year = {2026},
     volume = {43},
     number = {1},
     pages = {73-80},
     doi = {10.1109/MS.2025.3622690},
   }

9. arXiv

   Maintenance Signals in AI-Assisted GitHub Repositories: Evidence from GenAI Adopters

   Rikuto Tsuchida, Youmei Fan, Kazumasa Shimari, and 3 more authors

   arXiv preprint arXiv:2607.21079, 2026

   arXiv Bib

   @article{tsuchida2026maintenance,
     title = {Maintenance Signals in AI-Assisted GitHub Repositories: Evidence from GenAI Adopters},
     author = {Tsuchida, Rikuto and Fan, Youmei and Shimari, Kazumasa and Kula, Raula Gaikovina and Rodr{\'i}guez-P{\'e}rez, Gema and Matsumoto, Kenichi},
     journal = {arXiv preprint arXiv:2607.21079},
     year = {2026},
   }

2025

1. Intelligent SE

   Exploring the SECURITY.md in the Dependency Chain: Preliminary Analysis of the PyPI Ecosystem

   Chayanid Termphaiboon, Raula Gaikovina Kula, Youmei Fan, and 4 more authors

   In 2025 40th IEEE/ACM International Conference on Automated Software Engineering Workshops (ASEW), 2025

   DOI Bib

   @inproceedings{termphaiboon2025security,
     title = {Exploring the SECURITY.md in the Dependency Chain: Preliminary Analysis of the PyPI Ecosystem},
     author = {Termphaiboon, Chayanid and Kula, Raula Gaikovina and Fan, Youmei and Choetkiertikul, Morakot and Ragkhitwetsagul, Chaiyong and Sunetnanta, Thanwadee and Matsumoto, Kenichi},
     booktitle = {2025 40th IEEE/ACM International Conference on Automated Software Engineering Workshops (ASEW)},
     pages = {260-267},
     year = {2025},
     doi = {10.1109/ASEW67777.2025.00055},
   }

2. AIware

   Human to Document, AI to Code: Comparing GenAI for Notebook Competitions

   Tasha Settewong, Youmei Fan, Raula Gaikovina Kula, and 1 more author

   In 2025 2nd IEEE/ACM International Conference on AI-powered Software (AIware), 2025

   DOI Bib

   @inproceedings{settewong2025human,
     title = {Human to Document, AI to Code: Comparing GenAI for Notebook Competitions},
     author = {Settewong, Tasha and Fan, Youmei and Kula, Raula Gaikovina and Matsumoto, Kenichi},
     booktitle = {2025 2nd IEEE/ACM International Conference on AI-powered Software (AIware)},
     pages = {1-9},
     year = {2025},
     doi = {10.1109/AIware69974.2025.00015},
   }

3. EMSE

   Developer reactions to protestware in open source software: the cases of color.js and es5.ext

   Youmei Fan, Dong Wang, Supatsara Wattanakriengkrai, and 4 more authors

   Empirical Software Engineering, 2025

   Abs DOI Bib HTML

   This study examines developer reactions to protestware incidents in the JavaScript ecosystem, analyzing community responses to the color.js and es5.ext cases through mixed-methods empirical research.

   @article{fan2025developer,
     title = {Developer reactions to protestware in open source software: the cases of color.js and es5.ext},
     author = {Fan, Youmei and Wang, Dong and Wattanakriengkrai, Supatsara and Damrongsiri, Hathaichanok and Treude, Christoph and Hata, Hideaki and Kula, Raula Gaikovina},
     journal = {Empirical Software Engineering},
     volume = {30},
     number = {2},
     pages = {56},
     year = {2025},
     publisher = {Springer},
     doi = {10.1007/s10664-024-10599-6},
     url = {https://doi.org/10.1007/s10664-024-10599-6},
     dimensions = {true},
   }

4. MSR

   Do Developers Depend on Deprecated Library Versions? A Mining Study of Log4j

   Haruhiko Yoshioka, Sila Lertbanjongngam, Masayuki Inaba, and 5 more authors

   In 2025 IEEE/ACM 22nd International Conference on Mining Software Repositories (MSR), 2025

   DOI Bib

   @inproceedings{11025729,
     author = {Yoshioka, Haruhiko and Lertbanjongngam, Sila and Inaba, Masayuki and Fan, Youmei and Nakano, Takashi and Shimari, Kazumasa and Kula, Raula Gaikovina and Matsumoto, Kenichi},
     booktitle = {2025 IEEE/ACM 22nd International Conference on Mining Software Repositories (MSR)},
     title = {Do Developers Depend on Deprecated Library Versions? A Mining Study of Log4j},
     year = {2025},
     pages = {314-318},
     doi = {10.1109/MSR66628.2025.00057},
   }

5. MSR

   Mining for Lags in Updating Critical Security Threats: A Case Study of Log4j Library

   Hidetake Tanaka, Kazuma Yamasaki, Momoka Hirose, and 5 more authors

   In 2025 IEEE/ACM 22nd International Conference on Mining Software Repositories (MSR), 2025

   DOI Bib

   @inproceedings{11025604,
     author = {Tanaka, Hidetake and Yamasaki, Kazuma and Hirose, Momoka and Nakano, Takashi and Fan, Youmei and Shimari, Kazumasa and Kula, Raula Gaikovina and Matsumoto, Kenichi},
     booktitle = {2025 IEEE/ACM 22nd International Conference on Mining Software Repositories (MSR)},
     title = {Mining for Lags in Updating Critical Security Threats: A Case Study of Log4j Library},
     year = {2025},
     pages = {319-323},
     doi = {10.1109/MSR66628.2025.00058},
   }

6. PhD Thesis

   The Changing Landscape of Open Source Software Ecosystems: Sponsorships, Protestware, and Sanctions

   Youmei Fan

   Nara Institute of Science and Technology, 2025

   Bib

   @phdthesis{fan2025thesis,
     title = {The Changing Landscape of Open Source Software Ecosystems: Sponsorships, Protestware, and Sanctions},
     author = {Fan, Youmei},
     school = {Nara Institute of Science and Technology},
     year = {2025},
   }

2024

1. ICSE

   "My GitHub Sponsors profile is live!" Investigating the Impact of Twitter/X Mentions on GitHub Sponsors

   Youmei Fan, Tao Xiao, Hideaki Hata, and 2 more authors

   In Proceedings of the IEEE/ACM 46th International Conference on Software Engineering (ICSE), 2024

   Abs DOI Bib HTML

   This paper investigates how Twitter/X mentions impact GitHub Sponsors funding through empirical analysis of social media promotion strategies.

   @inproceedings{fan2024my,
     title = {"My GitHub Sponsors profile is live!" Investigating the Impact of Twitter/X Mentions on GitHub Sponsors},
     author = {Fan, Youmei and Xiao, Tao and Hata, Hideaki and Treude, Christoph and Matsumoto, Kenichi},
     booktitle = {Proceedings of the IEEE/ACM 46th International Conference on Software Engineering (ICSE)},
     pages = {1--12},
     year = {2024},
     doi = {10.1145/3597503.3639127},
     url = {https://doi.org/10.1145/3597503.3639127},
     dimensions = {true},
   }

2. ICSE

   Going Viral: Case Studies on the Impact of Protestware

   Youmei Fan, Dong Wang, Supatsara Wattanakriengkrai, and 4 more authors

   In Proceedings of the 2024 IEEE/ACM 46th International Conference on Software Engineering: Companion Proceedings, 2024

   DOI Bib

   @inproceedings{fan2024going,
     title = {Going Viral: Case Studies on the Impact of Protestware},
     author = {Fan, Youmei and Wang, Dong and Wattanakriengkrai, Supatsara and Damrongsiri, Hathaichanok and Treude, Christoph and Hata, Hideaki and Kula, Raula Gaikovina},
     booktitle = {Proceedings of the 2024 IEEE/ACM 46th International Conference on Software Engineering: Companion Proceedings},
     pages = {308-309},
     year = {2024},
     doi = {10.1145/3639478.3643086},
   }

3. IEEE Software

   The Impact of Sanctions on GitHub Developers and Activities

   Youmei Fan, Ani Hovhannisyan, Hideaki Hata, and 2 more authors

   IEEE Software, 2024

   Abs DOI Bib HTML

   An empirical study examining how international sanctions affect GitHub developer communities and their collaborative activities.

   @article{10767746,
     author = {Fan, Youmei and Hovhannisyan, Ani and Hata, Hideaki and Treude, Christoph and Kula, Raula Gaikovina},
     journal = {IEEE Software},
     title = {The Impact of Sanctions on GitHub Developers and Activities},
     year = {2024},
     volume = {42},
     number = {6},
     pages = {74-80},
     doi = {10.1109/MS.2024.3505204},
     url = {https://doi.org/10.1109/MS.2024.3505204},
     dimensions = {true},
   }

4. ISSREW

   Linking Code and Documentation Churn: Preliminary Analysis

   Ani Hovhannisyan, Youmei Fan, Gema Rodríguez-Pérez, and 1 more author

   In 2024 IEEE 35th International Symposium on Software Reliability Engineering Workshops (ISSREW), 2024

   DOI Bib

   @inproceedings{10771325,
     author = {Hovhannisyan, Ani and Fan, Youmei and Rodr{\'i}guez-P{\'e}rez, Gema and Kula, Raula Gaikovina},
     booktitle = {2024 IEEE 35th International Symposium on Software Reliability Engineering Workshops (ISSREW)},
     title = {Linking Code and Documentation Churn: Preliminary Analysis},
     year = {2024},
     pages = {107-108},
     doi = {10.1109/ISSREW63542.2024.00058},
   }

5. ISSREW

   How Maintainable is Proficient Code? A Case Study of Three PyPI Libraries

   Indira Febriyanti, Youmei Fan, Kazumasa Shimari, and 2 more authors

   In 2024 IEEE 35th International Symposium on Software Reliability Engineering Workshops (ISSREW), 2024

   DOI Bib

   @inproceedings{10771176,
     author = {Febriyanti, Indira and Fan, Youmei and Shimari, Kazumasa and Matsumoto, Kenichi and Kula, Raula Gaikovina},
     booktitle = {2024 IEEE 35th International Symposium on Software Reliability Engineering Workshops (ISSREW)},
     title = {How Maintainable is Proficient Code? A Case Study of Three PyPI Libraries},
     year = {2024},
     pages = {103-104},
     doi = {10.1109/ISSREW63542.2024.00056},
   }