5 Acknowledgments
This work was supported and funded by
National
Natural Science Foundation of China (Granted No.
51575525),
Natural Science Foundation of Jiangsu Province for Young Scholars
(Granted No. BK20180180), Natural Science Foundation of Jiangsu Province
(Grant No. BK20161188) and the Air Force Logistics College Youth Fund
(Grant No. KY2018D031C).