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자동차 시트용 탄소섬유 발열체의 전기적 및 저항 발열 특성
최경은 ( Kyeong Eun Choi ),박찬희 ( Chan Hee Park ),서민강 ( Min Kang Seo ) 한국공업화학회 2016 공업화학 Vol.27 No.2
In this paper, the electrical and resistance heating properties of carbon fiber heating elements with different electroless Ni-P plating times for car seat were studied. The specific resistance and specific heat of the carbon fibers were determined using 4-point probe method and differential scanning calorimetry (DSC), respectively. The surface morphology and temperature of carbon fibers were measured by scanning electron microscope (SEM) and thermo-graphic camera, respectively. From experimental results, the nickel layer thickness and surface temperature of carbon fibers increased with increasing the plating time. However, the specific heat and specific resistance decreased with respect to the increased plating time. In conclusion, the electroless Ni-P plating could improve the resistance heating and electrical properties of carbon fiber heating elements for car seat.
전통 문화와 최신 기술의 조화를 통한 실과 융합교육프로그램 개발
최경은(Choi, Kyeong Eun),배선아(Bae Seona) 학습자중심교과교육학회 2021 학습자중심교과교육연구 Vol.21 No.4
이 연구는 전통 문화와 최신 기술의 조화를 바탕으로 실과 융합교육프로그램을 개발하는데 목적이 있다. 연구의 목적을 달성하기 위하여 준비, 개발, 개선의 3단계 절차로 연구를 수행하였다. 준비 단계에서는 전통 문화와 실과교육의 관련성을 분석하여 융합교육프로그램의 기틀을 마련하였다. 개발 단계에서는 교육프로그램의 주제를 선정하고 교육목표 설정, 학습내용 선정 및 조직을 통해 총 30차시의 교육프로그램을 개발하였다. 개선 단계에서는 전문가 집단을 대상으로 타당도를 평가받고, 수정 보완하였다. 최종 개발된 교육프로그램은 다음과 같은 특징을 가진다. 첫째, 개발된 교육프로그램은 전통이 내포된 가정생활분야(의ㆍ식ㆍ주)의 내용 요소를 중심으로 AI, 로봇, SW, IoT, 3D 프린터, 드론 등 최신 기술을 활용하여 기능성과 유용성을 확장함으로써 전통 문화의 아날로그 감성과 최신 디지털 기술과의 조화와 융합을 추구하였다. 둘째, ‘21C 디지로그 기반 전통생활’을 주제로 ‘친환경 의생활’, ‘건강한 식생활’, ‘쾌적한 한옥 생활’, ‘안전한 공동체 생활’, ‘공유와 나눔 생활’ 등 5개의 하위 주제를 구성하였다. 셋째, 실천적이고 창의적인 노작ㆍ체험ㆍ실습 활동 중심의 30차시 교육프로그램을 개발하였다. 넷째, 학습자 수준, IT 기자재 보유 여부 등에 따라 학습 활동 선택과 활용이 가능하도록 하였다. The purpose of this study was to develop practical arts convergence education program by combining traditional culture and the latest technology. In order to achieve the objective, the study was conducted in three stages of preparation, development, and improvement. In the preparation stage, the correlation between traditional culture and practical arts education was analyzed to build a foundation for the convergence education program. Then in the development stage, the education program was developed by selecting the topic of the program, setting the educational goals, and selecting and organizing the learning content. Lastly, in the improvement stage, the validity of the program was assessed by a group of experts, after which the program was modified and supplemented. The final version of the education program have features as follows. First, the education program developed in this study focuses on content elements of home economics area that was related to tradition, while applying the latest technology such as AI, robots, SW, IoT, 3D printers, and drones to improve functionality and effectiveness. Through this, it was pursued to create a harmony between analog sentiment of traditional culture and the latest digital technology. Second, the program consists of a main topic of ‘Digilog Traditional Life in the 21st Century’ with five subtopics of ‘Eco-friendly Clothing & Textile Life’, ‘Healthy Dietary Life’, ‘Comfortable Housing Life in Hanok’, ‘Safe Community Life’, and ‘Sharing Life’. Third, the program was composed of 30-hours program that creative work, experience, and practice-oriented activities. Fourth, the program was designed to select and perform activities based on the student level or the availability of IT equipment.
철근콘크리트 보의 순수비틀림 거동에 따른 상ㆍ하단 철근비의 영향
최경은 ( Choi Kyeong-eun ),김동환 ( Kim Dong-hwan ),김형국 ( Kim Hyeong-gook ),이정윤 ( Lee Jung-yoon ),김길희 ( Kim Kil-hee ) 한국구조물진단유지관리공학회 2020 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.24 No.1
이 연구는 순수비틀림 하중을 받는 철근콘크리트 보의 FEM프로그램 ATENA 3D를 이용하여 종방향 상하단 철근비 영향을 평가하였다. 선행연구에서 실험은 상하단 철근비에 따른 순수비틀림 최대내력의 차이를 확인하였다. 해석변수로는 선행연구 실험결과를 비교하기 위해서 종방향 상하단 철근비 1.0과 0.5를 변수로 계획하였다. 해석결과 종방향 상하단 철근비의 영향에 따른 순수비틀림 실험체의 최대 내력 까지의 거동을 유사하게 예측하였다.
탄소섬유 방향이 미분쇄 탄소섬유/카본블랙/천연고무 복합재료의 기계적 물성에 미치는 영향
함은광 ( Eun Kwang Ham ),최경은 ( Kyeong Eun Choi ),고재경 ( Jae Kyoung Ko ),서민강 ( Min Kang Seo ) 한국공업화학회 2016 공업화학 Vol.27 No.2
In this work, the influence of milled carbon fiber direction on mechanical properties of milled carbon fibers/carbon blacks/natural rubber compounds was investigated. The compounds were prepared by adding the 6 phr milled carbon fibers (MCFs) and 40 phr carbon blacks (CBs) into the natural rubber. The MCFs were aligned in a parallel and orthogonal direction in the compounds using two-roll-mill machine. Mechanical properties of compounds were studied by tensile characteristics and tearing strength. As a result, the compounds showed higher tensile strength, 100%~300% modulus, and tearing strength than those of using any other compounds due to the aligning MCFs in parallel. Mechanical properties of the compounds reinforced with non-aligned MCFs were inferior to those of others. Consequently, the parallel aligned MCFs in the compounds led to an increase of tensile properties and improvement of tearing strength, resulted from MCFs with the high elastic modulus.