Youmei Fan

Email: fan.youmei.fs2[at]is.naist.jp

Hello, I’m Youmei Fan (范优美), an Assistant Professor of Software Engineering Laboratory at the Nara Institute of Science and Technology.

My research lies in Empirical Software Engineering, with a primary focus on OSS ecosystems. I study how developers collaborate, how their contributions evolve and sustain over time, and how financial and social dynamics influence participation in these communities. By combining large-scale data analysis with socio-technical perspectives, I aim to deepen our understanding of developer behavior and the sustainability of software as essential research infrastructure.

I am also interested in AI4SE, particularly in exploring how developers interact with large language models and how these tools reshape collaboration and practices in software development.

news

Sep 12, 2026	🎉 Honored to serve as Co-chair of the Early Research Achievements (ERA) track at ICPC 2027, co-located with ICSE 2027 in Dublin, Ireland! 🇮🇪
Aug 10, 2026	📝 Our report on BRIDGES 2026 is published in ACM SIGSOFT Software Engineering Notes!
Jun 20, 2026	😀 Our paper “On the Usage of Emojis to Signal Activism in GitHub Repositories” is published at SIML 2026!
Jun 15, 2026	📰 Our paper “Self-Admitted GenAI Usage in Open-Source Software” is now published in IEEE Transactions on Software Engineering! 🎉
Mar 05, 2026	📦 Our paper “Should Maintainers Deploy to Cross-Ecosystems? An Analysis of Packages from PyPI and NPM” is now published in IEICE Transactions on Information and Systems!

selected publications

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},
}

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

@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},
}

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

@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},
}

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

@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},
}