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손정현(Jeonghyun Sohn),박동운(Dongwoon Park),김민석(Minsuk Kim),유완석(Wansuk Yoo) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, a blackbox approach is carried out to model the nonlinear dynamic bushing model. One-axis durability test is performed to precisely describe the mechanical behavior of typical vehicle elastomeric components. The results of the tests are used to develop an empirical bushing model with an artificial neural network. The back propagation algorithm is used to obtain the weighting factor of the neural network. Since the output for a dynamic system at any time depends on values of present and past inputs plus past outputs, Narendra algorithm of 'NARMAX' form is employed to consider these effects. A numerical example is carried out to verify the developed bushing model.
동역학 해석을 위한 고무부싱의 실험적 모델링에 대한 연구
손정현 ( Jeong Hyun Sohn ),백운경 ( Woon Kyung Baek ),김동조 ( Dong Jo Kim ) 한국고무학회 2004 엘라스토머 및 콤포지트 Vol.39 No.2
고무부싱은 차량부품들을 서로 연결하고 차체로 전달되는 진동을 줄여주는 역할을 하는 중요한 요소로써 가진변위와 주파수에 대해서 모두 비설형 특성을 보이며, 특히 주기적인 가진에 대해 히스테리시스 현상을 나타낸다. 본 논문에서는 1축 내구시험기를 이용하여 차량 현가장치에 사용되는 부싱을 축 방향과 반경 방향에 대해 사인가진과 랜덤가진을 주어 특성을 살펴보았고 이러한 특성을 반영할 수 있는 동역학적 모델을 인공신경망을 이용하여 개발하였다. 실험결과는 신경망의 입력자료로 활용되었고, 오차역전파 알고리즘을 이용하여 실험적 부싱모델을 개발하였다. 개발된 실험적 부싱모델을 차량 시abf레이션에 적용하여 유용성을 살펴보았다. A rubber bushing connects the components of the vehicle each other and reduce the vibration transmitted to the chassis frame. A rubber bushing has the nonlinear characteristics for both the amplitude and the frequency and represents the hysteretic responses under the periodic excitation. In this paper, one-axis durability test is performed to describe the mechanical behavior of typical vehicle elastomeric components. The results of the tests are used to develop an empirical bushing model with an artificial neural network. The back propagation algorithm is used to obtain the weighting factor of the neural network. A numerical example is carried out to verify the developed bushing model and the vehicle simulation is performed to show the fidelity of proposed model.
손정현(Sohn, Jung Hyun),이영민(Lee, Young Min) 한국인적자원관리학회 2011 인적자원관리연구 Vol.18 No.4
본 연구에서는 한국복지패널 3차년도 자료를 활용하여, 만 50세 이상 64세 미만의 중고령 여성인력 1,486명의 취업 결정요인을 분석하였다. 연구의 결과는 다음과 같다. 첫째, 인구학적 요인으로 연령, 학력 수준, 건강상태, 배우자 유무, 자녀의 경제적 지원 여부 변인을 설정하여 분석한 결과, 연령과 학력 수준, 건강 상태, 자녀의 경제적 지원 변인은 취업여부에 유의미한 영향을 미쳤다. 그러나 배우자 유무 변인은 취업여부에 유의미한 영향을 미치지 못하였다. 특히 연령과 자녀의 경제적 지원 변인은 부정적 영향을, 건강상태와 학력은 긍정적 영향을 미쳤다. 둘째, 가구적 요인으로 건강, 가족수입, 주거환경, 가족관계, 사회적 친분관계, 여가생활 변인을 분석한 결과, 건강에 대한 만족도와 사회적 친분 관계에 대한 만족도, 여가생활에 대한 만족도가 취업여부에 유의미한 영향을 미쳤다. 구체적으로 건강 및 사회적 친분관계에 대한 만족도는 취업여부에 긍정적인 영향을 미치지만 여가 생활에 대한 만족도는 취업여부에 부정적인 영향을 미쳤다. 셋째, 제도적 요인으로 가입하고 있는 공적연금, 개인연금, 건강보험 변인의 영향 정도를 분석한 결과, 공적연금 수급 여부는 취업여부에 유의미한 영향을 미쳤다. 본 연구를 통해 중고령 여성인력을 보다 효과적인 지원을 할 수 있는 제도적 개선방안을 탐색할 수 있었다. This research analyzed determinants of employment decision for middle and old aged women between over fifty-year-old and under sixty four-year-old using KOWEPS (Korean Welfare Panel Study), the 3rd year’s panel data investigating 1,486 women. For research purpose, factors were categorized into three categories, demographical factor, family factor, and institutional factor and were analyzed to discover their effects on employment using logistic regression. First, an analysis of age, education level, health, spouse and economic support from children as a demographic factor showed that the age, education level, health, and economic support from children had a significant effect on employment. But, it showed that a spouse had not a important effect on employment as significance level .05. It also revealed that age and economic support from children had a negative effect, health and education level a positive effect on employment. These facts were identified that the lower age, education level, economic support from children were, and the better health was, they more likely to get a job. Second, an analysis of health, family income, residential environment, family relations, social acquaintance, leisure as family factors came true that satisfactions of health, social acquaintance had a significant effect on employment. Close scrutiny showed that satisfactions of health, social acquaintance had a positive effect on employment, but, satisfactions of leisure had a negative effect on employment. Third, an analysis of effective variables on public pension, showed that public pension had a significant effect on the employment as institutional factors in a significance level .05. But, it showed that private pension and health insurance had not a significant effect on the employment. This study implicated the improvement of political actions that supported the old aged women.
손정현(Jeonghyun Sohn),장진석(Jinseok Jang),유완석(Wansuk Yoo) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In this paper, the feasibility and stability of offshore wind power system are investigated. Dynamic responses of offshore 2MW wind power system subjected to wind and wave load are studied. The relative Morison equation is employed to generate the wave load for the time domain simulation. ADAMS program is employed to carry out the dynamic analysis of the floating structure system subjected to the environment load. Dynamic simulation of the floating wind power system according to number of platform legs are carried out and analyzed.