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황순욱,최경호,박용헌,R.Michael Ench,Alex M.Bates,이상철,권오성,이동하 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.3
Proton Exchange Membrane Fuel Cells (PEMFC) are the most appropriate for energy source of small robot applications. PEMFC has superior in power density and thermodynamic efficiency as compared with the Direct Methaol Fuel Cell (DMFC). Furthermore, PEMFC has lighter weight and smaller size than DMFC which are very important factors as small robot power system. The most significant factor of mobile robots is weight which relates closely with energy consumption and robot operation. This research tried to find optimum specifications in terms of type, number of cell, active area, cooling method, weight, and size. In order to find optimum 500W PEMFC, six options are designed in this paper and studied to reduce total stack weight by applying new materials and design innovations. However, still remaining problems are thermal management, robot space for energy sources, and so on. For a thermal management, design options need to analysis of Computational Fluid Dynamics (CFD) for determining which option has the improved performance and durability.
황순욱,최경호,박용헌,이상철,권오성,이동하,Hwang, S.W.,Choi, G.H.,Park, Sam.,Ench, R. Michael,Bates, Alex M.,Lee, S.C.,Kwon, O.S.,Lee, D.H. 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.suppl3
Proton Exchange Membrane Fuel Cells (PEMFC) are the most appropriate for energy source of small robot applications. PEMFC has superior in power density and thermodynamic efficiency as compared with the Direct Methaol Fuel Cell (DMFC). Furthermore, PEMFC has lighter weight and smaller size than DMFC which are very important factors as small robot power system. The most significant factor of mobile robots is weight which relates closely with energy consumption and robot operation. This research tried to find optimum specifications in terms of type, number of cell, active area, cooling method, weight, and size. In order to find optimum 500W PEMFC, six options are designed in this paper and studied to reduce total stack weight by applying new materials and design innovations. However, still remaining problems are thermal management, robot space for energy sources, and soon. For a thermal management, design options need to analysis of Computational Fluid Dynamics (CFD) for determining which option has the improved performance and durability.
데이터 기반 정책지원 대상 우수 중소기업 발굴 방법론 연구: 국내 수산산업을 대상으로
황순욱,천동필 한국수산경영학회 2018 수산경영론집 Vol.49 No.1
The Korean fisheries industry is a traditional business, the majority of which are small and medium-sized enterprises (SMEs). It has played an important role in the South Korean economies in the past several decades, but it currently faces the limitations of growth potential and profitability due to declining workforce, aging populations, deteriorating fishery environments, climate changes, and rapid changes in the global industrial ecosystem. Many studies have suggested solutions for the fisheries industry in macro perspective, but there are rarely any studies taking the strategic approaches for the problem. If it is possible for governments to support the companies that are likely to increase their value-added selectively, it will break through the current situation more effectively. This paper introduces a study on the selection method utilizing data envelopment analysis (DEA) to find SMEs with potentials to increase profits and growth. We suggest selecting SMEs with high management efficiency and ability to utilize intangible assets as the target companies. We also suggest policy objectives for SMEs in the domestic fisheries industry based on the results of DEA analysis and propose a data-based method for the policy decisions. 본 연구는 수산산업 대상으로 하는 정부정책의 효율성 강화를 위한 정부지원 대상 우수기업 선정방법에 대한 연구로서, 미래의 이익의 질이 높을 것으로 예상되는 경영효율성을 지니면서, R&D를 통한 혁신역량을 보유한 것으로 여겨지는 무형자산성과가 높은 수산산업 내 중소기업을 지원 대상으로선정하기 위하여 DEA 방법론을 사용하였다. 선정을 위해 KIS-Value DB의 2014~2016년 재무정보를사용하였고, 해양수산부(2015)가 제시한 수산산업 분류기준을 통해 국내 수산산업에 속한 543개 기업을 분류하였으며, DEA를 사용하여 국내 수산산업의 경영성과와 무형자산성과를 분석하였다. 본 연구에서는 수산업의 대분류기준으로 분석 범위를 설정하여 수산산업 전반의 상황을 살펴볼 수 있었으나, 수산업 내 중분류 기업들 간에 이질성이 높을 가능성이 존재한다. 이에 향후 연구에서는 각 중분류별로 분석한 후 전체를통합하는 접근이 필요할 것이다.
케이블과 탄성보로 지지되는 모바일 하버 크레인의 끝단 처짐량 분석
황순욱,한기철,최은호,조진래,임오강,Hwang, Soon-Wook,Han, Ki-Chul,Choi, Eun-Ho,Cho, Jin-Rae,Lim, O-Kaung 한국전산구조공학회 2010 한국전산구조공학회논문집 Vol.23 No.3
Mobile harbor is characterized by the lightweight compact structure when compared to the conventional above-ground port container crane. A new concept RORI crane system, which was devised for mobile harbor to satisfy the compactness and light weightness, not only can load/unload containers with high speed on sea but can be completely folded at maneuvering mode. This study is concerned with the tip deflection of the horizontal boom of mobile harbor at container loading operation. Both the theoretical method utilizing the Castigliano's theorem and the numerical approach by finite element method are employed, and the reliability of the latter approach is verified through the comparison with the theoretical results. And then, the effect of the initial cable tension on the tip deflection is parametrically examined by the finite element analysis. 모바일 하버용 크레인은 항만 부두에 설치되어 있는 일반 지상식 크레인과는 달리 소형 경량 구조를 요구한다. RORI 크레인은 이러한 요구조건을 만족시키기 위해 고안된 신개념의 모바일 하버용 크레인 시스템으로서 해상에서 컨테이너 상하역 작업을 고속으로 처리할 수 있을 뿐만 아니라 운항 시에는 완전히 접을 수 있도록 되어 있다. 본 연구는 컨테이너 상하역 작업에 따른 RORI 크레인의 수평붐 끝단 처짐량 분석에 관한 내용으로, 카스틸리아노 정리를 이용한 이론적인 방법과 유한요소법에 의한 수치해석적인 방법을 적용하였다. 두 기법으로 구한 끝단 처짐량을 비교분석함으로써 유한요소해석의 타당성을 입증하고, 케이블의 초기장력에 따른 끝단 처짐량 변화특성을 파라메트릭하게 분석하였다.