Interdisciplinary research has been encouraged through the policies of many governmental and institutional funding agencies
in Korea. This paper measured the degrees of interdisciplinarity in individual and collaborative researches and analyzes the
factors affecting it. This paper also examined flow of knowledge among different disciplines in science and engineering research
using a database obtained from research proposals submitted to Korea Science and Engineering Foundation (KOSEF). The analysis
indicated that 54.6% of collaborative research proposals were interdisciplinary, while 35.8% of individual research proposals
were interdisciplinary. The analysis of knowledge inflow/outflow structure showed that Natural science served as a link between
Life science and Engineering.