Funding for this research was provided by:
Natural Science Foundation of Shandong Province (ZR2018BF014)
Scientific Research Foundation of Shandong University of Science and Technology for Recruited Talents (2017RCJJ042)
Key Laboratory for wisdom mine information technology of Shandong Province, Shandong University of Science and Technology (no)
Article History
Received: 15 August 2018
Accepted: 22 December 2018
First Online: 3 January 2019