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레이저 박리용 선형 빔 광학계의 빔 변환 모듈과 단축 형상에 대한 연구
이승민,이광진,김대용,이상현,정진호,Lee, Seungmin,Lee, Gwangjin,Kim, Daeyong,Lee, Sanghyun,Jung, Jinho 한국광학회 2021 한국광학회지 Vol.32 No.6
본 논문은 디스플레이용 OLED의 제작 공정에 사용하는 레이저 박리(laser lift-off, LLO) 장비의 선형빔 광학계에 대한 연구로서, M<sup>2</sup>가 큰 레이저를 사용하는 경우, 단축의 선폭을 작게 만들면서 공정심도를 깊게 유지하기 위한 빔 변환 모듈(beam transformation unit, BTU)을 포함한 광학계에 대한 연구를 진행하였고, 단축 형상을 슈퍼 가우시안으로 만들 수 있는 방법과 flat-top 분포로 만들 수 있는 광섬유를 사용하는 빔 변환 방식에 대하여 제시하였다. This paper reports the study of the line-beam optical system of the laser lift-off (LLO) equipment used in the OLED manufacturing process. To obtain both a long process depth and a narrow width of the line beam, even with the poor M<sup>2</sup> value of the laser source, the research is focused on the optical system, including the beam transformation unit (BTU). We also propose optical configurations for the super-Gaussian distribution and the fiber-based BTU for the flat-top distribution.
전철구 ( Jeon Cheolgu ),이광진 ( Lee Gwangjin ),윤경진 ( Yun Kyeongjin ),김민호 ( Kim Minho ),최수정 ( Choi Sujeong ) 국군의무사령부 2015 대한군진의학학술지 Vol.46 No.1
Objective : This research was conducted to present the way to reduce the concentrations of its exposure to military men by examining radon concentrations in underground water. Method : We selected military bases in Gangwon-do, Chungcheong-do, Kyungsang-do and Jeonra-do. Sampling sites were tube wells, water tanks, washrooms, and water purifiers. We sampled 706ml of underground water from each sites using the measuring kit and exposed these samples in radon detector for 48 hours, then analyzed the concentration. Results : The average radon concentration in the underground water of Gangwon-do area was the highest as 797.67(±1,025.19) pCi/l. For types of sampling sites, tube well was 1,288.08(±1,883.63) pCi/, water tank was 725.12(±990.17) pCi/l, washroom was 666.78(±945.00) pCi/l, and water purifier was 218.07(±302.73) pCi/l. The concentration distribution of each sampling sites, 55.3∼97.2% were below 1,000 pCi/l and 1.9∼2.6% were above 4,000 pCi/l. Conclusion : Concentrations in some tube wells, water tanks, and washrooms were over 4,000 pCi/l, which is a recommended value, so we have to further investigate if this is related to increment of indoor radon concentrations. Furthermore, using highly concentrated underground water in limited space for a long time can be harmful. Thus, it is necessary to ventilate adequately and restrain the continuous use. Thus, in order to use underground water for drinking, we need to ensure its safety by going through regular tests.
전철구 ( Jeon Cheolgu ),이광진 ( Lee Gwangjin ),윤경진 ( Yun Kyeongjin ) 국군의무사령부 2015 대한군진의학학술지 Vol.46 No.1
Objectives : Insufficient management of harmful working environment in infantry divisions lead to the possibility of workers being exposed to the workplace related disorders. Through harmful working environment condition investigations, an appropriate management plan is to be suggested. Methods : By conducting interviews with each infantry divisional workplace managers, status of individual workplace environment could be investigated. surveys related to the working environment were given out to the workers. Results : The investigation revealed that the harmful working environment conditions included welding, washing with chemical solvents, soldering of communicative equipment, and woodworking. In the survey, 56% of the workers were satisfied with their working environment, but 19.1% of the workers felt seriously concerned about the harmful conditions of their workplace. 30% of the workers replied that installing ventilation systems could advance the conditions and has the highest priority in terms of improving the workplace. 29.8% of the workers replied that they have received safety and health education. 25.7% also answered that the most desired information to be included in the education was the effect of harmful substances on health. Conclusions : The result of the investigation on infantry division harmful working environment conditions revealed that the working procedures were being carried out in small scales, but harmful factors such as noise, chemical dust, organic compounds, and heavy metals were affecting the workers' health. Moreover, health management of workers has not been carried out until now, and immediate attention of prevention of occupational diseases is needed. Therefore, it is necessary to reinforce harmful factors sampling of the workplace environment, workers' health diagnosis and industrial disease prevention through safety and health education.
이채연(Yi, Chaeyeon),양호진(Yang, Hojin),이광진(Lee, Gwangjin),배민기(Bae, Mingi) 한국측량학회 2021 한국측량학회 학술대회자료집 Vol.2021 No.11
본 연구에서는 청주시를 대상으로 열스트레스가 높은 지역을 발굴하고 폭염 피해에 대응하기 위해 그린루프(옥상녹화), 쿨루프(차열페인트), 쿨링포그(안개분사), 클린로드(도로살수), 도시녹지 시나리오를 적용하였다. 도시규모의 미기후해석모델링 기법을 이용하여 폭염피해저감 시설이 온도나 열쾌적지수를 낮추는데 효과적인지를 추정하였다. 단기적으로 시행되는 쿨링포그와 클린로드는 물을 이용한 일시적인 기온 감소의 효과를 나타내나 시간지연에 따라 약간 상승하는 경향을 보이며, 열쾌적지수(UTCI)를 낮은 수준으로 변화시킨다. 장기적으로 그린루프와 쿨루프는 건물 지붕표면의 알베도를 변화시켜 표면온도를 낮추는 효과가 있다. 쿨루프를 적용한 지역은 초기에 기온 감소의 폭이 크며, 낮 동안 일사량 및 복사량이 증가함에도 불구하고 기온상승 폭이 가장 약한 것으로 나타났다. 도시 내에서 열스트레스가 가장 높은 산업단지를 상세분석한 결과, 열쾌적지수를 낮은 수준으로 변경한 시나리오는 쿨링포그, 쿨루프, 도시녹지 조성 시나리오였다. 이 3가지 시나리오가 청주에서 가장 열방출이 높은 산업단지와 주변지역에 적합하게 구현된다면 도시의 열환경과 에너지 소비가 개선될 수 있다. 본 연구의 결과가 폭염저감 시설 설치 및 폭염대응 정책에 대한 의사결정에 대한 민감도를 높이는 데 활용될 수 있을 것으로 기대한다.
쉘터장착형 HVAC 시스템의 냉방성능 향상을 위한 구조최적화 설계
진성은(Sungeun Jin),이원희(Wonhee Lee),이광진(Gwangjin Lee),윤의열(Euiyoul Yoon),주상현(Sanghyeon Joo) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
The military shelter is equipped with a number of high-temperature electronic equipment and operates in external environmental conditions. Therefore, an effective cooling system is required for operator comfort and stable operation of electronic equipment. In this study, we propose the optimum HVAC system design method for the cooling performance by performing the structural optimization design for the existing HVAC system. We measured the air flow rate of existing HVAC system and analyzed whether it is possible to improve the cooling performance. Based on the analysis results, we redesigned the System structure. The performance analysis of the redesign system utilized a flow network model, empirical correlation and CFD analysis. As a result, cooling performance is estimated to increase by up to 139.6%.