[1] Korea Univ, KU KIST Grad Sch Converging Sci & Technol, Seoul 02841, South Korea
[2] Andong Natl Univ, Dept Int Trade, Andong 36729, South Korea
[3] North Carolina A&T State Univ, Dept Accounting & Finance, Greensboro, NC 27411 USA
[4] Hankuk Univ Foreign Studies, Coll Business, Seoul 02450, South Korea