Funding for this research was provided by:
National Natural Science Foundation of China (51465013, 61661013)
Innovation Project of GUET Graduate Education (GDYCSZ201443, GDYCSZ201480, 2016YJCX104)
Guangxi Key Laboratory of Automation Test and Instrumentation (YQ15109)
Graduate Research Project of Education Department of Guangxi (YB2014138)