1. a Department of Materials Science and Engineering/Research Center for Sustainable Device & ECo-Materials (ReSEM) , Chungju National University , 123 Gumdan-ri, Iryu-myeon, Chungju-si, Chungbuk, 380-702, Korea
2. b ZENIXON Co., LTD. Business Incubation Building , Chungju National University , 123 Gumdan-ri, Iryu-myeon, Chungju-si, Chungbuk, 380-702, Korea