Funding for this research was provided by:
The Open Funding Project of State Key Laboratory of Virtual Reality Technology and Systems, Beihang University (BUAA-VR-16KF-18)
Construction of Scientific and Technological Innovation and Service Capability - Basic Scientific Research Funding Project, Beijing Technology and Business University (PXM2018_014213_000033)
Article History
Received: 24 April 2018
Revised: 16 September 2018
Accepted: 4 October 2018
First Online: 12 October 2018