About the Authors

Jing Lou

Affiliation School of Computer Science and Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu, China

Mingwu Ren

renmingwu@sina.com

Affiliation School of Computer Science and Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu, China

Huan Wang

Affiliation School of Computer Science and Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu, China

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: JL MR HW. Performed the experiments: JL MR. Analyzed the data: JL MR HW. Wrote the paper: JL MR HW.