[Yang, Tian] Natl Univ Def Technol, Coll Informat Syst & Management, Changsha 410073, Hunan, Peoples R China.^[Li, Teng] Cent South Univ Forestry & Technol, Coll Logist & Transportat, Changsha 410000, Hunan, Peoples R China.^[Lang, Guangming] Changsha Univ Sci & Technol, Sch Math & Comp Sci, Changsha 410114, Hunan, Peoples R China.