First Author:   Changkuk Jung Ulsan National Institute of Science and Technology jungck@unist.ac.kr   50 UNIST-gil Eonyang-eup Ulsan, 44919, South Korea   82-52-217-3056(Phone) 82-52-217-3056(Fax) Second Author: Mansokku Lee State University of New York at Geneseo leem@geneseo.edu   1 College Circle, South Hall 100 Geneseo, 14454, USA   585-245-5363(Phone) 585-245-5467(Fax) Third Author: Taeyoung Lee University of Utah taeyoung.lee@economics.utah.edu   332 S 1400E Building 73, Rm 222 Salt Lake City, 84112, USA   801-581-7481(Phone) 801-581-5649(Fax)