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정희문,최상규,하성규 대한기계학회 1995 대한기계학회논문집 Vol.19 No.7
An optimum design has been performed to maximize specific energy (SED) of composite flywheel rotor for energy storage system. The flywheel rotor is assumed to be an axisymmetric thick laminated shell with a plane strain state for structural analysis. For the structural analysis the centrifugal force is considered and the stiffness matrix equation was derived for each ring considering the interferences between the rings. The global stiffness matrix was derived by integrating the local stiffness matrix satisfying the conditions of force and displacement compatibilities. Displacements are then calculated from the global stiffness matrix and the stresses in each ring are also calculated. 3-D intra-laminar quadratic Tsai-Wu criterion is then used for the strength analysis. An optimum procedure is also developed to find the optimal interferences and lay up angle to maximize SED using the sensitivity analysis.
오창수 ( Changsu Ouh ),정희문 ( Heemun Cheong ) 보험연구원 2017 보험금융연구 Vol.28 No.2
본 연구의 목적은 생명보험 사망담보계약의 사고자료를 활용하여 사고발생 계약의 특성과 방카슈랑스계약과 비방카슈랑스계약과의 가입자 속성별 차이점을 분석하고 방카슈랑스채널이 사망담보계약의 사고발생과 관련하여 유의적인 조절효과가 있는지를 최종적으로 분석하는데 있다. 방카슈랑스채널의 조절효과 검증을 위해 모형1, 모형2, 모형3으로 구성된 위계적 로지스틱모형을 적용하였다. 모형1은 사망보험금에 영향을 주는 성별, 계약연령, 직업구분 (위험등급) 등 개별 독립변수로만 분석하였으며, 모형2는 독립변수와 조절변수로 방카슈랑스채널 선택변수를 추가로 적용하여 분석하였고, 모형3은 독립변수와 조절변수인 방카슈랑스채널 선택변수에 상호작용항을 추가로 적용하여 분석하였다. 모형3을 통한 방카슈랑스채널의 조절효과 분석결과 방카슈랑스채널을 선택한 계약자의 사고발생률(오즈비)이 연령이 높아질수록 비방카슈랑스채널 대비 낮게 나타났으며, 위험등급 및 가입금액이 높아질수록 비방카슈랑스채널 대비 방카슈랑스계약의 사고발생률(오즈비)이 낮아지는 것으로 분석되어, 방카슈랑스채널의 조절효과가 나타나는것으로 분석되었다. The purpose of this study is to analyze the characteristics of independent Variables, which influence the mortality rate of life insurance contracts. This paper is also focused on whether bancassurance channel has moderating effects on mortality rate compared with non-bancassurance channel. This study used hierarchical logistic regression model, which is composed of Model 1, Model 2, and Model 3 to analyze moderating effects of Bancassurance channel. Model 1 analyzed the characteristics of mortality rate using logistic model with individual independent variables such as gender, contract age, job group (risk level), death benefit and protection influence degree. Model 2 analyzed characteristics of mortality rate using logistic model with additional variable (bancassurance channel choice variable), which is used as moderating variable in Model 3. Model 3 analyzed whether bancassurance channel has moderating effects on mortality rate using logistic regression model. This study shows that mortality rate (the odds ratio) of bancassurance channel policyholders was lower than that of non-bancassurance channel polycyholders when ages increase. Moreover, it was showed that mortality rate (the odds ratio) of bancassurance channel policyholders was lower than that of non-bancassurance channel policyholders when risk level and insured amount became higher. This paper shows bancassurance channel has moderating effects on mortality rate of life insurance contracts consequentially.