supported by NSF of Hebei Province(No.A2016408016);NSFC(No.11271047);the Fund for Hundreds of Excellent Innovative Talents in Higher Education of Hebei Province(No.BR2-235)
supported by the National Natural Science Foundation of China(61179026);the Fundamental Research Funds for the Central Universities(Science)(ZXH2012K003);中国民航大学科研基金(2010kys04)~~