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윤시원(Yoon, Si-won) 한국역사연구회 2012 역사와 현실 Vol.- No.86
The Army ROTC program of the Republic of Korea originated from an officer education system of the United States. But there is an important difference between the two nations" systems. In the United States, introduction of ROTC was led by people who opposed the concept of military conscription. On the other hand, in the Republic of Korea, the Ministry of Defense played a critical role in adopting the ROTC system. Before and After the Korean War, the Army of South Korea was in drastic needs of capable officers. It did not have an officer recruiting system for a modern army of mass conscription. After failing to secure proper military training methods for students, the ministry of defence prepared to introduce the ROTC system. ROTC training turned out to be successful in South Korea. Before the introduction of ROTC, for students there was only one way to meet military obligations: conscription. The ROTC system was met with positive responses by many students who had been dissatisfied with the previous policy of student conscription. The ROTC system shortly became the primary method of officer recruitment for the Korean army. By the year of 1965, universities came to provide nearly two-third of new officers for the ROK army, through the ROTC system. The success of the Korean ROTC program tells us many things. It had originated from the culture of a volunteer army, but was adopted as an institution of mass conscription for the South Korean army.
윤시원 ( Yoon Si-won ) 수선사학회 2020 史林 Vol.0 No.71
During the Korean War, the military draft system was implemented in South Korea. The characteristic of Korea in the mid-1950s is that the ruling elites of the society show dual positions on the universal conscription. The ruling elite class of society were in a position to defend the conscription system. At the same time, however, they prevented the operation of conscription and avoided military service. In such a situation, it was difficult to persuade the people to accept the universal conscription. The amendment to the Military Service Act in 1957 was aimed at carrying out the so-called “egalitarian military draft”. However, the conflict between the Ministry of Defense and the Ministry of Education in the process of enacting amendments to the Military Service Act showed the duality of the ruling elite with regard to conscription. As a result, the implementation of “egalitarian military draft” has become an incomplete task.
태양열 계절 간 열저장·이용 기반 열 공급 모델 비교·분석 연구
윤시원(Siwon Yoon),임용훈(Yong Hoon Im) 대한설비공학회 2023 설비공학 논문집 Vol.35 No.10
This study aimed to investigate the feasibility of employing solar energy for seasonal thermal storage and utilization in horticulture facilities. The implementation of geothermal heat pump systems in large-scale horticulture farms has encountered challenges due to the substantial investment costs and operational stability concerns related to heat source temperatures. To address these limitations, this study proposes the novel concept of seasonal thermal storage and utilization. By incorporating a suitably sized storage tank, the capacity requirements of costly energy generation facilities like heat pumps can be significantly reduced, ensuring more consistent annual operation. Nevertheless, the installation of solar collectors for seasonal thermal storage may present additional challenges due to lack of space to accommodate large collectors, particularly in urban areas where the cost of land is high. This study considered two variations of seasonal thermal storage and utilization models, and conducted a comprehensive analysis of their operational characteristics and energy utilization. Through simulations and comparative analyses using an in-house developed simulation tool, the optimal design variables are determined, and the detailed operational characteristics are evaluated. The findings of this study furnish technical evidence supporting the viability of seasonal thermal storage and utilization, offering substantial benefits that can be applied in horticulture facilities.
윤시원(Si-won Yoon),유기성(Ki-Sung Yoo),오상현(Sang-Hyun Oh),시성규(Seong-kyu See) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.11
The present study has been conducted on a cooling wheel to enhance the cooling efficiency by performing reverse engineering. Through pipe simulation, pressure and velocity distribution of each point is calculated. This result is then applied to the 3D thermal fluid analysis of which results show temperature distribution of the cooling wheel. With a component replacement and system modifications, such as incresement of pump capacity and the number of cooling channel, the cooling wheel temperature is significantly dropped to reasonable range.