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점탄성층을 삽입한 3층 적층보의 진동감쇠특성에 관한 연구
박응순(Eung-Soon Park),박세만(Sae Man Bhak),박명균(Myung Kyun Park),박상규(Sang Kyu Park) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_1
For a number of years it has been known that flexural vibrations in a plate can be damped by the application of a layer of damping (viscoelastic) material that is in turn constrained by a backing layer or foil. A common example is the damping tape currently used in aircraft and electronic equipment.<br/> This paper present a quantitative analysis of the resultant damping of the sandwiched beam. As in the work of H. Oberst the damping is characterized by the loss factor ??. which the damping is the normalized imaginary part of the complex bending stiffness of damped plate.<br/> An experimental technique known as the impulse technique is presented for measuring the vibration damping of composite materials<br/> <br/>
충격기법을 이용한 샌드위치보에 내재된 점탄성 성질에 관한 연구
박명균,박세만,박상규,박응순 明知大學校 産業技術硏究所 1995 産業技術硏究所論文集 Vol.14 No.-
For a number of years it has been known that flexural vibrations in a plate can be damped by the application of a layer of viscoelastic material that is in turn constrained by a backing layer or foil. A common example is the damping tape currently used in aircraft. This paper presents a quantitative analysis of the damping effectiveness of such a constrained layer. As in the work of H. Oberst the damping is characterized by the loss factor η, which is the normalized imaginary part of the complex bending stiffness of the damped beam.
理論과 政策의 關係에 對한 小考 : 經濟理論과 經濟政策을 中心으로
朴應淳 全南大學校企業經營硏究所 1978 産業經濟硏究 Vol.5 No.1
This study is to obserue the diversification process in the relationship between theory and policy, and, moeover, suggests that the theory is the knowledge acquired from the viewpoint of causal methodology and the policy is the knowledge acquired from the viewpoint of telgological methodology. But we found that it was quite difficult to set up the policy objective in the study of policy. It is true that there are many theories as to the relationship between economic theory and economic policy, and they are divided into two categories; one is the economic science, and the other is the normative science. The economic science is the study of "Sein" to find the principles based on the causal relationship through the observation and description of what the economic policy is in the past and present. The normative science is to study "Sollen" in which the study of economic policy and to set up the policy objectives, and direct its objectives. In conclusion, the relationship between the economic theory and the economic policy is that between the economic "Sein" and the economic "Sollen", and the clear-cut explanation of its relationship will sovel the funclamental problem.