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정우진(Chung Woojin),김성원(Kim Sungwon) 한국철도학회 2000 철도저널 Vol.3 No.1
This paper addresses the experimental study on the nonlinear critical speed and the validity of simple prediction formulation. The experiment on nonlinear critical speed is carried out using roller rigs, which has been impossible on track because of a possibility of an accident. In addition, experiment for a bogie is performed to check the difference in modeling a full railway vehicle and a bogie. It is found that nonlinear critical speed proves to be an inherent phenomenon of a railway vehicle itself and the difference of test results between a full railway vehicle and a bogie is comparatively negligible. Finally, the accuracy of simple prediction formulation for outbreak velocity and response frequency in hunting is investigated.
정우진(Chung Woojin),김성원(Kim Sungwon) 한국철도학회 1999 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper addresses the experimental study on the nonlinear critical speed and the validity of simple prediction formulation. The experiment on nonlinear critical speed is carried out using roller rigs, which has been impossible on track because of a possibility of an accident. In addition, experiment for a bogie is performed to check the difference in modeling a full railway vehicle and a bogie. It is found that nonlinear critical speed proves to be an inherent phenomenon of a railway vehicle itself and the difference of test results between a full railway vehicle and a bogie is comparatively negligible. Finally, the accuracy of simple prediction formulation for outbreak velocity and response frequency in hunting is investigated.
정미라(Chung Mira),황성원(Hwang Sungwon) 한국열린유아교육학회 2003 열린유아교육연구 Vol.8 No.3
본 연구는 프랑스의 현행 국가 수준 유치원 교육과정(2002년)을 한국의 제6차 유치원 교육과정과 비교교육적인 관점에서 분석하였다. 비교의 준거는 교육과정의 발달과 변화 교육과정 개발 과정 및 절차 교육과정 편성 및 운영 체제 교육과정 목적 및 목표, 교육과정 영역별 내용을 중심으로 하였다. 프랑스는 언어교육과 과학교육을 특별히 강조하고 있으며, 국가 수준의 교육과정에서는 유아들이 최소한 갖추어야 할 능력과 교육 내용 활동이 개괄적으로 언급되어 있을 뿐 우리나라의 경우처럼 세분화된 수준별 교육으로 문서화하지 않았다. 또한 언어 건강, 사회 탐구 표현생활 중심의 교육과정 내용영역의 구분은 한국과 유사하지만 우리 니라의 건강생활에 속하는 신체운동이 독립되어 하나의 교육과정 영역을 구성하고 있다. 프랑스와 한국의 유치원 교육과정은 영역별 내용에서 다소 차이가 있지만 양국가는 유아의 전인적 성장 인성 교육 사회화 기능 기초 학습능력의 준비를 공통적으로 강조하고 있다. This dissertation takes an approach in terms of comparative education to curriculum in French kindergartens in comparison with educational materials for kindergarten curriculum newly amended in the year of 2002, especially for state-owned kindergartens in Korea. French curriculum for kindergarteners emphasizes language teaching and science teaching; what is specified in their curriculum is only the minimums for kindergartners expected competences and activities for participation while in Korean curriculum specific teaching items for every level are listed. French curriculum doesn't show a big difference from Korean one in the education areas based on language, physical development, society, research and expressions with an exception that their curriculum structure has physical exercises and activities respectively. In conclusion, despite some differences by the area, there are similarities between western and eastern educational systems in terms of consideration for children's development, children's growth as the whole person, personality development and socialization functions of education.
Defect Dynamics at a Single Pt Nanoparticle during Catalytic Oxidation
Kim, Dongjin,Chung, Myungwoo,Kim, Sungwon,Yun, Kyuseok,Cha, Wonsuk,Harder, Ross,Kim, Hyunjung American Chemical Society 2019 NANO LETTERS Vol.19 No.8
<P>Defects can affect all aspects of a material by altering its electronic properties and controlling its chemical reactivity. At defect sites, preferential adsorption of reactants and/or formation of chemical species at active sites are observed in heterogeneous catalysis. Understanding the structural response at defect sites during catalytic reactions provides a unique opportunity to exploit defect control of nanoparticle-based catalysts. However, it remains difficult to characterize the strain and defect evolution for a single nanocrystal catalyst in situ. Here, we report Bragg coherent X-ray diffraction imaging of defect dynamics in an individual Pt nanoparticle during catalytic methane oxidation. We observed that the initially tensile strained regions of the crystal became seed points for the development of further strain and subsequent disappearance of diffraction density during oxidation reactions. Our detailed understanding of the catalytically induced deformation at the defect sites and observed reversibility during the relevant steps of the catalytic oxidation process provide important insights of defect control and engineering of heterogeneous catalysts.</P> [FIG OMISSION]</BR>
정순둘(Soondool Chung),문진영(Jinyoung Moon),김성원(Sungwon Kim) 한국노년학회 2010 한국노년학 Vol.30 No.4
본 연구의 목적은 고령은퇴자의 다양한 측면의 사회적 관계망이 은퇴만족도에 미치는 영향을 알아보고, 이를 통해 고령은퇴자의 은퇴만족도를 향상시키는 방안을 제시하는데 있다. 연구에 사용한 데이터는 중ㆍ고령자를 대상으로 한 최초의 전국 데이터인 한국 고령화연구패널조사(Korean Longitudinal Study of Ageing: 이하 KLoSA) 2006년도 제1차 기본조사 데이터이다. 조사 참여자 중 65세 이상의 노인 가운데 대도시 및 중소도시에 거주하고, 은퇴만족도 질문에 응답한 1,009명을 대상으로 하였다. 자료 분석은 이분형 로지스틱 회귀분석방법을 실시하여 이루어졌으며, 다양한 사회적 관계망과 기타 변수들이 은퇴만족도에 미치는 영향을 살펴보았다. 연구결과, 사회적 관계망 중 자녀와의 접촉빈도와 사회활동 참여 개수 그리고 자녀와의 관계만족도가 은퇴만족도에 유의미한 영향을 미치는 변수인 것으로 나타났다. 또한 기타 변수에서 성별, 주관적 건강상태, 은퇴 형태, 은퇴 경과 기간이 은퇴만족도에 영향을 미치는 유의미한 변수인 것으로 나타났다. 결과는 앞으로 고령은퇴자를 위한 예방적 차원의 은퇴 준비 프로그램 제공과 고령은퇴자의 가족 자원 활용 및 사회활동 참여 기회의 장을 확대하는 등 제도적 기반 마련과 지역사회와의 연계의 필요성을 시사해 주고 있다고 하겠다. The objectives of this study were to examine how social networks of old retirees impact on their retirement satisfaction, and through this, to suggest ways of improving their retirement satisfaction. Data used in this study were from 2006 KLoSA(Korean Longitudinal Study of Ageing), which were collected from 1,009 elderly people aged 65 and over who resided metropolis and smaller medium cities and answered regarding their retirement satisfaction. Data were analyzed by Binary Logistic Regression method. As a result, the frequency of contact with children, the number of participation in their social activities, and the satisfaction of relationship with children were the significant variables to predict retirement satisfaction. In addition, other variables such as gender, subjective health status, type of retirement, and duration of past retirement have been found as significant variables to explain retirement satisfaction. Implications for designing effective retirement plan and service systems have been discussed.