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In this paper, a physically meaningful methodology which can assess the contribution of each vibration mode to various vibration response signals (displacement, velocity, acceleration) is developed. Based on these results, the problem of quantitative assessment of the relative importance of a structural system's vibrational modes is discussed. In addition, a direct method which can assess the relative importance of each mode from uniformly sampled experimental data is also proposed.攀†책임저자;정회원, 중앙대학교 기계공학부E-mail : jelee@cau.ac.krTel : (02)820-5284, Fax : (02)824-8130* 정회원, 중앙대학교 대학원 기계공학부攀攀