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자중조절 기능이 있는 해상풍력 지지구조의 하중 및 구조해석
오민우,김동현,김기하,김석태,Oh, Minwoo,Kim, Donghyun,Kim, Kiha,Kim, Seoktae 한국전력공사 2016 KEPCO Journal on electric power and energy Vol.2 No.3
해상풍력터빈 시스템은 크게 상부의 풍력터빈과 하부의 지지구조로 구성된다. 해상풍력발전은 육상용 풍력발전보다 우수하다는 평가가 지배적이지만 육상용 풍력발전에서 고려되지 않는 파랑에 의한 주기적인 하중이 추가로 고려되기 때문에 다양한 외부 환경조건에 대하여 높은 안정성 확보가 요구된다. 본 연구에서는 전산유체역학 기법을 활용하여 설계된 해상풍력 하부구조에 대한 하중해석을 수행하고 유한요소해석을 통해 설계된 자중조절형 해상풍력 기초에 대한 구조 건전성을 검토하였다. Offshore wind turbines are divided into an upper wind turbine and a lower support structure. Offshore wind turbine system is required to secure high reliability for a variety of external environmental conditions compared to ground wind turbines because of additional periodic loads due to ocean wave and current effects. In this study, extreme load analyses have been conducted for the designed offshore wind turbine foundation with weight control functionality using computational fluid dynamics (CFD) then structural analyses have been also conducted to investigate the structural design requirement.
오염하천(진위천)의 환경평가를 위한 생물지수간 적용성 비교분석
오민우 ( Min Woo Oh ),이옥민 ( Ok Min Lee ),송호복 ( Ho Bok Song ),박선진 ( Sun Jin Park ),송미영 ( Mee Young Song ),공동수 ( Dong Soo Kong ) 한국물환경학회 2011 한국물환경학회지 Vol.27 No.6
Jinwi Stream is considerably polluted. The urban development in a Jinwi Stream basin can make state of aquatic ecosystem worse. However, researches for aquatic ecosystems in Jinwi Stream are insufficient. In this study, biotic indices of periphytic diatoms (DAIpo and TDI), benthic macroinvertebrates (EPT, KSI and ESB) and fish (IBI) were compared with the annual water quality data. Benthic macroinvertebrates indices showed highly significant correlations with concentrations of organic materials and nutrients, while DAIpo, TDI and IBI showed low correlations with them. In particular, ESB can be considered as an useful indicator that reflects the degree of diversity and abundance of biotic community as well as water quality. In polluted and disturbed streams as Jinwi Stream, DAIpo, TDI and IBI appeared to be not available for evaluating and discriminating the water quality, although they have been known as good indices in general streams.
오민우(Oh, Min-Woo),김수연(Kim, Sue-Yeon),원영신(Won, Young-Shin) 한국체육과학회 2021 한국체육과학회지 Vol.30 No.3
The purpose of this study is to find a way to increase the educational utilization of School Virtual Reality (VR) Sports classroom in primary school. The research questions of this study are: First, what are the experiences of primary school teachers regarding the operation of the VR sports classroom? Second, what are the educational effects and limitations of the VR sports classroom in students learning recognized by the teachers. To this end, qualitative research methods were applied to analyze those research topics and in-depth interviews were conducted with teachers in four primary schools that operate virtual reality classrooms. The results for each research question are followed. First, the primary school teachers who participated in the study thought that the activities of the students in the VR sports classroom have a positive influence on the students through the experiences of operating it. Second, the teachers thought it was difficult to secure budgets and spaces for the VR sports classroom but educational effects, such as motivation and interests of physical activity had been increased through the VR sports classroom activities. For the improvement of the VR sports classroom practices in primary schools, the central platform is highly needed along with the capacity building of VR sports class teachers with the strong support from the education ministries. If so, it will be used as a convergence education as well as physical education in primary school
해상풍력 해저케이블 하역용 유압식 코일링 암 구조설계 및 해석
김명환,김동현,오민우,Kim, Myung-Hwan,Kim, Dong-Hyun,Oh, Min-Woo 한국전산구조공학회 2013 한국전산구조공학회논문집 Vol.26 No.1
본 논문에서는 해저케이블 부두 하역용 장비인 코일링 암(coiling arm)에 대한 국산화 자체개발 내용 중 구조설계 및 해석결과 내용을 제시하였다. 상세 구조설계를 위해 3차원 CAD 프로그램을 이용하여 고 정밀도의 모델링을 수행하였고, 유한요소 기법을 이용하여 전산구조해석을 수행하였다. 코일링 암의 활용 목적에 맞추어 하역대상 케이블을 선박에서 케이블 탱크로 하역시 효과적으로 가이드 할 수 있도록 베어링 및 롤러 부품을 설계하여 메인 암이 회전하고 케이블 가이드가 이동할 수 있도록 하였고, 기존의 외국 모델에서 사용하던 와이어 및 모터 시스템을 이용한 케이블 가이드 작동방식을 유압 시스템을 이용한 작동방식으로 변경하여 원가절감을 달성하면서 사용자가 직관적으로 작동할 수 있도록 설계하였다. 장비 자체의 자중 및 하역 케이블 하중조건에 대한 응력 해석을 수행하였고, 유압시스템의 과작동에 따른 파손 가능성을 고려하였다. 케이블 가이드의 운동 및 설치 지면의 경사도에 따른 전복 안전성 해석을 수행하였으며, 설치장소의 풍하중 효과도 추가로 고려하였다. 본 연구를 통해 기존 수입품 코일링 암의 작동방식 개선과 독자적인 구조설계 및 해석 방법을 확립하였으며, 실제 국내 최초로 자체 개발된 제품의 현장설치 완료 및 하역작업의 효율적이고 정상적인 운영을 완료 및 검증하였다. Structural design and analysis of a coiling arm unloading machine for submarine cable have been originally conducted in this study. Three-dimensional CAD modeling process is practically applied for the structural design in detail. Finite element method(FEM) and multi-body dynamics(MBD) analyses are also used to verify the safety and required motions of the designed coiling arm structure. The effective moving functions of the designed coiling arm with respect to rotational and radial motions are achieved by adopting bearing-roller mechanical parts and hydraulic system. Critical design loading conditions due to its self weight, carrying cables, offshore wind, and hydraulic system over operation conditions are considered for the present structural analyses. In addition, possible inclined ground conditions for the installation of the designed coiling arm are also considered to verify overturn stability. The present hydraulic type coiling arm system is originally designed and developed in this study. The developed coiling arm has been installed at a harbor, successfully tested its operational functions, and finished practical unloading mission of the submarine cable.
측면보행 기울기에 따른 정지 및 보행 시 요부와 하지근 표면 stress EMG에 미치는 영향
이만기(Man Gi Lee),오민우(Min Woo Oh),김귀백(Kwi Baek Kim) 한국사회체육학회 2010 한국사회체육학회지 Vol.0 No.39
The purpose of this study was to evaluate stress on right and left muscle of erector spinae, Vastusmedialis, and lateral gastrocnemius through EMG, as such, analyzed differences of right and left side of muscle activity according to the surface area of gradient during standing and walking. The subjects for this study were 6 female students of I University. The results were as follows that gradient comparison of erector spinae, lateral gastrocnemius according to types of position in right and left side standing and working showed significance statistically, but interaction was not statistically significant between standing, working and gradient. However, Vastusmedialis according to types of position and interaction in right and left side standing and working showed significance statistically.
뇌병변 소아환자의 기립보조기 사용 시 접촉 패드 유형에 따른 근활성도 비교
이종훈(J. H. Lee),오민우(M. W. Oh),하종규(J. G. Ha),서재용(J. Y. Seo),황화식(H. S. Hwang) 한국재활복지공학회 2014 재활복지공학회논문지 Vol.8 No.3
본 연구에서는 Pneumatic air fitting system을 적용한 기립보조기 제품을 뇌병변 소아환자를 대상으로 기립보조기의 신체 고정용 폼패드(foam pad)와 에어패드(air pad) 사용 시, 뇌병변 장애아동들의 체간 및 하지근육의 수축 양상을 비교·분석하였다. 연구결과, 패드(foam pad vs. air pad) 유형에 따른 근육별 근력 활성도는 차이가 있었다. 이러한 차이는 큰 동작(식사동작)에서 크게 나타나고, 작은 동작(쓰기동작, 읽기동작)이 작게 나타났다. 이는 Pneumatic air fitting system을 적용한 기립보조기 제품 사용 시, 기존 폼패드에 비해 사용자에게 좀 더 편안함을 제공하는 것으로 나타났다. This study conducted a comparative analysis of the contraction pattern of trunk and lower limbs muscles of handicapped children with brain lesions during the use of foam pad and air pad for fixing a standing table to the body for pediatric patients with brain lesions using a standing table product applied with a pneumatic air fitting system. There was a difference in the measurement of muscle strength activity by muscle in accordance with pad type (foam pad vs. air pad). A large difference was found with big movements (movements of eating), while a small difference was discovered with small movements (writing and reading movements). This was found to furnish a little more comfort to users compared with the existing foam pad during the use of a standing table product applied with a pneumatic air fitting system.