Funding for this research was provided by:
The Key Fund Project of Sichuan Provincial Department of Education (17ZA0414)
The Laboratory for Internet of Things and Mobile Internet Technology of Jiangsu Province (JSWLW-2017-006)
Article History
Received: 31 March 2018
Accepted: 7 June 2018
First Online: 29 June 2018
Compliance with Ethical Standards
:
: The authors declare that we have no conflicts of interest.