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연구논문(硏究論文) : 준위협종 긴흑삼릉의 서식지 보전과 복원을 위한 환경 특성 분석
김서현 ( Seohyeon Kim ),김재근 ( Jae Geun Kim ) 한국환경복원기술학회 2015 한국환경복원기술학회지 Vol.18 No.1
Sparganium japonicum Rothert. is designated as a near threatened species by the National Institute of Biological Resources and is restrictively distributed in South Korea. To conserve and restore habitats of this plant, we investigated environmental characteristics and vegetation at five habitats during the growing season. Thirty plant species from seventeen families were found in the S. japonicum community. The species frequently found in this community included Utricularia vulgaris, Potamogeton distinctus, Phragmites japonica, Cicuta virosa, Persicaria thunbergii, Phragmites communis, Hydrilla verticillata. Maximum height of this plant reached at August and average height at five habitats is 120 cm at this time. Water and soil environmental factors showed low values compared with that of other wetlands. S. japonicum lived in not only shallow water level but also deep water level. These results can be helpful for S. japonicum habitat conservation and restoration.
양민지 ( Minji Yang ),김서현 ( Seohyeon Kim ) 사단법인 아시아문화학술원 2021 인문사회 21 Vol.12 No.6
본 연구의 목적은 중년남성의 중년기에 대한 질적연구를 메타합성하여 중년기 적응경험을 이해하고 본질적 의미를 파악하기 위한 것이다. 질적 합성분석은 Noblit & Hare가 제시한 과정에 따라 분석하였다. 중년남성의 적응경험을 설명하기 위해 9개의 질적연구를 종합하였으며 중심현상은 ‘노후 대비로 나아가기’였으며 관련된 5개의 개념은 ‘부정적 심리적 변화 경험으로 쉽게 상처받음’, ‘신체 변화에 대한 수용과 허세’, ‘자기성찰에서 삶의 가치 발견’, ‘새롭게 다가온 가족의 의미와 가정으로 회귀’, ‘삶의 의미를 통합해 노후 대비로 나아감’이다. 따라서 중년남성의 중년기 적응을 위해 가족구성원의 이해적 태도와 지지체계 형성, 중년기에 대한 인식 제고 및 사회경제적 제도의 변화가 필요할 것이다. This study was aimed to understand and grasp the essential meaning of mid-life adaptation experiences among middle-aged men though qualitative meta-synthesis. Qualitative meta-synthesis was performed using the method suggested by Noblit & Hare. The central phenomenon found in the 9 qualitative studies was ‘advancing to old age’ and 5 concepts emerged; Easily hurt by experiences of negative and psychological changes, Acceptance and pretentiousness of body changes, Discovering the value of life through self-reflection, The meaning of the new family and return to the home, ‘advancing to old age’ through life integration. Therefore, middle-aged men will need the understanding attitude from their family members, support system, acknowledgment of middle-life and Changes in social-economic Institutions.
EV Formula 조향 너클의 서스펜션 지오메트리 최적화 및 경량설계
심민서(Minseo Shim),김종수(Jongsu Kim),남도엽(Doyeop Nam),박재필(Jaepil Park),이경도(Kyungdo Lee),배건일(Keonil Bae),최우석(Wooseok Choi),신종현(Jonghyeon Shin),장재성(Jaeseong Jang),김서현(Seohyeon Kim) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6
Two of the most important parts of designing an E.V vehicle are minimizing weight and improving vehicle performance. The steering knuckle, which is connected to and supports the wheel, tie rod, brake caliper and links, is a critical part of the car’s steering system. This is because incorrect geometry and additional mass on the steering knuckle affects the stability and performance of the vehicle in dynamic condition. The paper illustrates the forces acting on the steering knuckle, the failure criteria and the optimization of the component. Optimization has been carried out varying the shape and mass characteristics of the steering knuckle and suspension system parameters. CAD model of the wheel assembly had been developed using CATIA, with respect to geometric parameters obtained on suspension and steering system analysis using CARTCROSS software with various structural and geometric constraints. Topology analysis was done to reduce the additional mass of the wheel assembly. Then, Finite element analysis of the steering knuckle carried out using ANSYS WORKBENCH for static and basic dynamic loading conditions without compromising its geometric and load transfer characteristics.