About the Authors

Fei Cai
Deke Guo

caifei1104@gmail.com

Affiliation Science and Technology on Information Systems Engineering Laboratory, National University of Defense Technology, Changsha, China

Honghui Chen
Zhen Shu

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: FC HC DG. Performed the experiments: FC ZS DG. Analyzed the data: FC HC ZS. Wrote the paper: FC HC ZS.