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데이터센터의 신재생에너지 의무비율 달성방안으로 연료전지의 경제성 분석
이가람(Kha Ram Lee),송두삼(Doo Sam Song) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
Data centers, which are the most energy-intensive buildings, install various types of new and renewable energy facilities in accordance with The Energy Use Rationalization Act. Data centers should be constructed with ZEB(Zero-Energy Building) from 2025, and more than 20 percent of its total energy supply should be covered by new and renewable energy. Therefore, the fuel cell will become popular and absolutely necessary in data centers due to good space efficiency. Based on the simulation results and analysis of operation data, the fuel cells hot water production is much higher than its demand. In order to secure economic feasibility and enable continuous operation of fuel cells, it is necessary to adjust the price of LNG for fuel cells, implement a fuel cell power generation support system. Also, the relevant regulations need to be revised so that surplus hot water produced by fuel cells can be sold to the District Heating Corporation or nearby heat-consuming facilities.
집단 구성원의 창의성 유형이 문제 유형에 따라 문제해결 과정 및 성과에 미치는 영향
이가람 ( Garam Lee ),조규락 ( Kyoo-lak Cho ) 한국교육공학회 2017 교육공학연구 Vol.33 No.4
본 연구의 목적은 집단 문제해결 상황에서 구성원의 창의성 유형이 문제 유형에 따라 문제해결 과정 및 성과에 어떤 영향을 미치는지 알아보는 것이다. 이를 위해 창의성 유형별 집단에게 상이한 유형의 문제를 제공하여 문제해결 활동을 실시하였고, 이들의 문제해결 과정과 문제해결 성과를 분석하였다. 연구결과 첫째, 집단 구성원의 창의성 유형은 문제 유형에 따라 문제해결 과정에 영향을 미치는 것으로 나타났다. 각 집단은 담화의 패턴에서 차이를 보였는데, 이것은 집단 구성원의 특성과 집단이 해결하고자 하는 문제의 속성에 따라 집단의 상호작용 과정이 다르게 나타날 수 있음을 의미한다. 둘째, 집단 구성원의 창의성 유형은 문제 유형에 따라 창의적 문제해결 성과에 영향을 미치는 것으로 나타났다. 특히 창의성의 가장 주요한 속성 중 하나인 새로움 측면에서 문제 유형별로 상반된 성과를 나타냈는데, 기획 문제해결에서는 혁신적 유형 구성원 집단이 적응적 유형 구성원 집단보다 성과가 높았으나, 인지갈등 문제해결에서는 적응적 유형 구성원 집단이 혁신적 유형 구성원 집단보다 성과가 더 높았다. 이는 집단 문제해결에서 구성원의 창의성 유형 및 문제 유형이 상호관련성을 가지면서 창의적 문제해결에 영향을 미치는 것을 의미한다. 본 연구는 집단 문제해결의 과정적 측면과 결과적 측면을 함께 면밀히 탐구하여, 집단 문제해결에서 구성원의 특성과 당면한 문제의 특성에 따라 창의적 문제해결의 과정과 성과가 달라질 수 있음을 밝혀내었다는 점에서 의의를 찾을 수 있다. The purpose of this study is to investigate the effect of group creativity type on problem solving process and performance according to problem type in a group problem solving situation. For this purpose, the study provided different types of problems to the groups, executed problem solving activities, and analyzed their problem solving processes and problem solving outcomes. Research results were as follows: First, it affected group member's problem solving processes according to the types of problems. Each group showed differences in the pattern of discourse, which means that the process of group interaction can vary depending on the characteristics of the group members and the problem they are solving. Second, the creativity type of group members influenced creative problem solving performances according to the problem type. Especially, in terms of novelty that is one of the significant attributes of creativity, the opposite result showed according to the problem type. That is, innovative type group showed higher performances than adaptive type group in problem solving planning process, while adaptive type group was more effective in solving cognitive conflict problem. It means that group creativity type and problem type interrelates and affects member's creative problem solving. Since the study thoroughly investigated both process and outcome of group problem solving, it is very suggestive in that creative problem solving processes and outcomes can be changed according to the characteristics of the members and the problem type in the group problem solving.
이가람 ( Ka Ram Lee ),하재필 ( Jae Pil Ha ) 한국체육사학회 2016 체육사학회지 Vol.21 No.1
한국 배구의 초창기 역사는 안개 속에 있다. 배구의 진원지가 미국 YMCA라는 사실은 잘 알려져 있지만, 한국 배구의 도입과정을 파악할 수 있는 구체적인 자료가 부족했기 때문이다. 본 연구는 YMCA 기관지, YMCA의 Annual Report, 신문기사, 일기 등의 1차 사료를 근거로 한국 배구의 도입과정의 실체를 파악하였다. 그 결과, 배구는 1904년 YMCA의 체육프로그램으로 채택되어 한국에 소개되었고, 이후 YMCA를 매개로 문화적 확산을 거쳤다. 하지만 배구의 문화적 진화에는 동면의 시간이 필요했다. 당시 YMCA 회원의 대부분이 청년 계층이었고, 이들은 배구보다 거친 스포츠에 매료되어 있었기때문이다. 배구는 당시 다른 근대스포츠문화와 달리 한국 토양에 스며들기까지 문화적 적응기간이 필요했다. The early history of Korean volleyball remains in a fog. Although it has been well-known that volleyball is originated in the North American YMCA, there is a dearth of specific data supporting its process of introduction to Korea. This study investigated how volleyball was introduced to Korea, based on primary sources including the YMCA official press, annual reports published by the YMCA, newspaper articles. and diaries. The results show that volleyball was introduced to Korea in 1904 as a part of physical education programs by the YMCA. Afterwards, it was actually expanded in Korea by a media of the YMCA. The cultural evolution of volleyball needed a period of dormancy since the members of the Korean YMCA, at that time, were mostly the young, who were fascinated by more physical sports than volleyball. Moreover, unlike other sports, a period of acculturation was needed until volleyball was infiltrated into the Korean soil.
압출 가공 wick-free plate가 적용된 다중효용확산 태양열 증류기의 성능 실험
이가람(Lee Ga-Ram),임병주(Lim Byung-Ju),최석민(Choi Seok-Min),박창대(Park Chang-Dae) 한국태양에너지학회 2021 한국태양에너지학회 논문집 Vol.41 No.1
We have developed a wick-free plate (WFP) in which a groove pattern is applied to the surface of a plate to replace the wick-plate, which is a key component of a multi-effect diffusion distiller (MEDD). Wicks and plates act as an evaporation surface and a condensation surface, respectively, in MEDD. However, the wick-plate structure has several problems, such as laborious manufacturing processes and lower durability. Therefore, in this study, WFPs were manufactured using the extrusion method, and MEDD with WFPs was experimentally evaluated. The extrusion method had a lower processing cost and better corrosion-resistance surface than the etching process that was employed in our previous study. The extruded WFP could lower the manufacturing cost by 77% compared to the etched WFP, and had the advantage of absorbing more solar radiation energy by lowering the installation inclination angle by 10°. After fabricating the triple-effect MEDD with the extruded WFPs, an indoor performance experiment was conducted. The results of the solar thermal performance test indicated that WFP-MEDD at 11.7 MJ/(㎡·d) of thermal energy produced 3% higher freshwater than the existing MEDD with a wick-plate.
이가람(Lee Ga-Ram),이정윤(Lee Jung-Yun),김지영(Kim Ji-Young),김태연(Kim Tae-Yeon),이승복(Leigh Seung-Bok) 한국건축친환경설비학회 2010 한국건축친환경설비학회 학술발표대회 논문집 Vol.2010 No.10
greenhome<SUP>plus</SUP> is a Sustainable Residential Building in Yonsei University in Song-do Campus. There are diverse core technologies, each according to their performance criteria are applied differently in five models in the building. The purpose of this study is to verify the effect of the integrated technology of each element on the building in Summer. To achieve this purpose, the simulation program of ESP-r and the experiment were used to evaluate 5 types of models.
에너지 비용을 고려한 중앙냉방시스템 최적운영 방안에 관한 연구(의료시설을 중심으로)
이가람(Ga-Ram Lee),송재엽(Jae-Yeob Song) 한국지열·수열에너지학회 2020 한국지열에너지학회논문집 Vol.16 No.4
For a central cooling system of a medical facility composed of absorption chiller and screw chiller, the study was conducted on how to minimize the energy cost. In consideration of the energy cost, the optimal operation method in which the operation method of the heat source is changed according to the size of the cooling load was derived through simulation analysis. When applying the optimal operation method, the indoor environment, energy consumption, and energy cost were analyzed and compared with the reference operation method.
데이터센터의 신재생에너지 의무비율 달성방안으로 연료전지의 경제성 분석
이가람(Kha Ram Lee),송두삼(Doo Sam Song) 대한설비공학회 2022 대한설비공학회 학술발표대회논문집 Vol.2022 No.6
Data centers, which are the most energy-intensive buildings, install various types of new and renewable energy facilities in accordance with The Energy Use Rationalization Act. Data centers should be constructed with ZEB(Zero-Energy Building) from 2025, and more than 20 percent of its total energy supply should be covered by new and renewable energy. Therefore, the fuel cell will become popular and absolutely necessary in data centers due to good space efficiency. Based on the simulation results and analysis of operation data, the fuel cells hot water production is much higher than its demand. In order to secure economic feasibility and enable continuous operation of fuel cells, it is necessary to adjust the price of LNG for fuel cells, implement a fuel cell power generation support system. Also, the relevant regulations need to be revised so that surplus hot water produced by fuel cells can be sold to the District Heating Corporation or nearby heat-consuming facilities.