About the Authors

Yuanyuan Sun

syuan@dlut.edu.cn

Affiliation College of Computer Science and Technology, DaLian University of Technology, Dalian, China

Rudan Xu

Affiliation College of Computer Science and Technology, DaLian University of Technology, Dalian, China

Lina Chen

Affiliation National Astronomical Observatories, Chinese Academy of Sciences, Beijing, China

Ruiqing Kong

Affiliation College of Computer Science and Technology, DaLian University of Technology, Dalian, China

Xiaopeng Hu

Affiliation College of Computer Science and Technology, DaLian University of Technology, Dalian, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: YYS. Performed the experiments: RDX. Analyzed the data: LNC. Contributed reagents/materials/analysis tools: RQK XPH. Wrote the paper: YYS RDX.