Funding for this research was provided by:
National Natural Science Foundation of China (No.61572382)
Key Project of Natural Science Basic Research Plan in Shaanxi Province of China (No. 2016JZ021)
China 111 Project (No.B16037)
Guangxi Cooperative Innovation Center of cloud computing and Big Data (No. YD17X07)
Guangxi Colleges and Universities Key Laboratory of cloud computing and complex systems (No. YF17103)
Article History
Received: 6 June 2018
Accepted: 22 November 2018
First Online: 8 January 2019