Funding for this research was provided by:
National High Technology Researchand Development Program of China (2007AA 01Z334)
National Natural Science Foundation of China (61272219, 61321491)
Program for New Century Excellent Talents in University (NCET-04-04605)
State Key Laboratory of Novel Software Technology (ZZKT2018A09)
Article History
Received: 2 November 2018
Revised: 6 June 2019
Accepted: 30 September 2019
First Online: 29 January 2020