Funding for this research was provided by:
Natural Science Foundation of Shandong Province, China (ZR2017MEM019)
Technology and Culture Innovation Fund for Student of Liaocheng Univerisy (26312171923)
Innovative Entrepreneurship training Program for College students of Liaocheng Univerisy (201710447009)
Article History
Received: 29 May 2018
Accepted: 18 July 2018
First Online: 20 July 2018