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• https://scholarworks.gnu.ac.kr/handle/sw.gnu/40755
• https://scholarworks.gnu.ac.kr/handle/sw.gnu/40754
• https://scholarworks.gnu.ac.kr/handle/sw.gnu/40753
• https://scholarworks.gnu.ac.kr/handle/sw.gnu/40752
• https://scholarworks.gnu.ac.kr/handle/sw.gnu/40751
• https://scholarworks.gnu.ac.kr/handle/sw.gnu/40750
• https://scholarworks.gnu.ac.kr/handle/sw.gnu/40749
• https://scholarworks.gnu.ac.kr/handle/sw.gnu/40748
• https://scholarworks.gnu.ac.kr/handle/sw.gnu/40759
• https://scholarworks.gnu.ac.kr/handle/sw.gnu/40758
• https://scholarworks.gnu.ac.kr/handle/sw.gnu/40757
• https://scholarworks.gnu.ac.kr/handle/sw.gnu/40756