Currently I am an assistant researcher of Department of Computer Science and Technology in Nanjing University.

Before that, I received my B.Sc. degree from Southwest Jiaotong University (SWJTU) in June 2010 and I received my Ph.D. degree from Nanjing University in September 2016.


Ph.D. in Computer Science:
Nanjing University (NJU), Nanjing, China. Sep 2010 ~ Sep 2016
Research Supervisor: Prof. Yuming Zhou

Visiting Scholar:
University College London (UCL), London, UK. Oct 2013 ~ Dec 2013
Research Supervisor: Prof. Mark Harman and Jens Krinke (CREST centre in Department of Computer Science)

B.Sc. in Computer Software:
Southwest Jiaotong University (SWJTU), Chengdu, China. Sep 2006 ~ Jun 2010


My research interest is empirical software engineering, especially on software defect prediction.


Y. Zhao, H. Leung, Y. Yang, Y. Zhou, and B. Xu. "Towards an understanding of change types in bug fixing code." Information and Software Technology, 2017. Accepted. (IST).

Y. Feng, W. Wang, Y. Yang, H. Lu, Y. Zhou, and B. Xu. "An Empirical Investigation into the Cost-Effectiveness of Test Effort Allocation Strategies for Finding Faults." In: Proceedings of the 24th IEEE International Conference on Software Analysis, Evolution, and Reengineering, Klagenfurt, Austria, Feb. 20-24, 2017. Accepted. (SANER 2017)

Y. Yang, Y. Zhou, J. Liu, Y. Zhao, H. Lu, L. Xu, B. Xu, and H. Leung. "Effort-aware just-in-time defect prediction: Simple unsupervised models could be better than supervised models." In: Proceedings of the 24th ACM SIGSOFT International Symposium on the Foundations of Software Engineering, Seattle, WA, USA, Nov. 13-18, 2016: 157-168. (FSE 2016) [code]

Y. Yang, M. Harman, J. Krinke, S. Islam, D. Binkley, Y. Zhou, and B. Xu. "An Empirical Study on Dependence Clusters for Effort-Aware Fault-Proneness Prediction." In: Proceedings of the 31st IEEE/ACM International Conference on Automated Software Engineering, Singapore, Singapore, Sept. 3-7, 2016: 296-307. (ASE 2016) [code]

Y. Yang, Y. Zhao, C. Liu, H. Lu, Y. Zhou, and B. Xu. "An empirical investigation into the effect of slice types on slice-based cohesion metrics." Information and Software Technology, 75: 90-104, 2016. (IST)

Y. Zhao, Y. Yang, H. Lu, J. Liu, H. Leung, Y. Wu, Y. Zhou, and B. Xu. "Understanding the value of considering client usage context in package cohesion for fault-proneness prediction." Automated Software Engineering, online, 2016. (ASEJ)

W. Ma, L. Chen, Y. Yang, Y. Zhou, and B. Xu. "Empirical analysis of network measures for effort-aware fault-proneness prediction." Information and Software Technology, 69: 50-70, 2016. (IST)

Y. Yang, Y. Zhou, H. Lu, L. Chen, Z. Chen, B. Xu, H. Leung, and Z. Zhang. "Are Slice-Based Cohesion Metrics Actually Useful in Effort-Aware Post-Release Fault-Proneness Prediction? An Empirical Study." IEEE Transactions on Software Engineering, 41(4): 331-357, 2015. (TSE)

Y. Zhao, Y. Yang, H. Lu, Y. Zhou, Q. Song, and B. Xu. "An empirical analysis of package-modularization metrics: implications for software fault-proneness." Information and Software Technology, 57: 186-223, 2015. (IST)

Y. Zhou, Y. Yang, B. Xu, H. Leung, and X. Zhou. "Source code size estimation approaches for object-oriented systems from UML class diagrams: A comparative study." Information and Software Technology, 56(2): 220-237, 2014. (IST)

Honers and Awards

Program A for Outstanding PhD candidate, Nanjing University, 2015; (南京大学优秀博士研究生创新能力提升A计划, 获优秀项目)
Si—Shi—Yang—Hua gold medal, 2009; (西南交通大学竢实扬华奖章)
National Scholarship 2008; (国家奖学金)


Office: 712, Computer Science Building,
Xianlin Campus of Nanjing University

Mail: Yibiao Yang
National Key Laboratory for Novel Software Technology,
Nanjing University, Xianlin Campus Mailbox 603,
163 Xianlin Avenue, Qixia District,
Nanjing 210023, China
Email: yangyibiao (at) OR yangyibiao (at)