Abstract
요약
1. Introduction
2. Study background
2.1 Literature review
2.2 Literature distinction
3. Methodology
3.1 Research flow
3.2 Social Network Analysis
3.3 Degree centrality
3.4 Betweenness centrality
3.5 Closeness centrality
4. Case study
4.1 Data Collection
4.2 First period (1990-1999)
4.3 Second period (2000-2009)
4.4 Third period (2010-2018)
5. Conclusion
REFERENCES