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Interdisciplinary studies are conducted vigorously in various fields nowadays. To keep place with this trend, it is necessary to educate an integrated study in universities. Thus the analysis of course articulations among the establishment subjects for achieving the educational goal. In order to analyze the articulations, we used the Pearson and Spearman correlation methods among 240 opened subjects in the R.O.K naval academy. We investigated 44,145 grades of total 691 students from the class of 2006 to 2013. We especially focused on correlations among subject of liberal arts, military science (common major) and other majors (selective one). As a result, we derived the articulation ratios are discriminated by each major. Also, there are high articulations between science subjects of liberal arts and science majors, and between science majors and military science. Besides, English subjects of liberal arts are closely relevant only to the English subjects of foreign language major. In addition, we obtained some of the other characteristic results.