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협업을 통한 문제해결 과정에서 초등학생들의 협력적 문제해결력을 향상시키는 교실 문화 탐색
이가람(Lee, Ga Ram),박일우(Park, Il-Woo),주은정(Ju, Eunjeong) 학습자중심교과교육학회 2019 학습자중심교과교육연구 Vol.19 No.3
이 연구는 협업을 통해 창의적 문제를 해결하는 과정에서 어떠한 교실 문화가 초등학생들의 협력적 문제해결력을 효과적으로 향상시킬 수 있는지 알아보기 위해 진행되었다. 연구를 위해 초등학교 3학년 학생 24명을 대상으로 창의적 문제해결을 경 험할 수 있도록 과학 단원별로 1학기 4개, 2학기 4개의 팀 과제를 차례로 제시하고 협업을 통해 이를 해결하도록 하였다. 3월과 10월에 각각 사전 사후 검사를 실시한결과, 협업을 통한 문제해결 과정은 학급 구성원들의 협력적 문제해결력 신장에 유의 미한 영향을 준 것으로 나타났다(p<.05). 학생들의 협력적 문제해결력 향상을 가능하게 한 교실 문화를 탐색하였을 때, 참여 학급에는 공동 과제에 대한 몰입이 강화되는 분위기와 팀 과제에 대해 자발적으로 참여하는 교실 문화가 형성되는 것을 관찰할수 있었다. 또한 참여 학급은 팀 내 갈등을 적극적으로 해결하여 허용적 분위기를 만들어 갔으며 구성원들 간에 긍정적인 피드백을 장려하는 문화가 조성되었다. The purpose of this study was to investigate how classroom culture can effectively improve the collaborative problem-solving ability of elementary students in the process of solving creative problems through collaboration. For the study, 24 students in the 3rd grade of elementary school were presented with team work for solving 8 creative problems, As a result of pre and post test in March and October, the problem-solving process through collaboration showed a significant influence on enhancing collaborative problem-solving ability of the class members (p<.05). The results of collecting and analyzing the qualitative data for exploring the classroom culture are these. The classroom culture was observed to be formed, which was enabled students to improve their collaborative problem-solving ability. The participating class has the atmosphere to strengthen the learning flow to the collaborative task and voluntarily participate in the team task. In addition, the participating class actively solved conflicts within the team to create a permissive atmosphere and encouraged positive feedback among members.
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.
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.