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유재윤(Jae Yun Yoo),송용우(Yong Woo Song),김민영(Min Young Kim),박진철(Jin Chul Park) 대한설비공학회 2020 대한설비공학회 학술발표대회논문집 Vol.2020 No.6
This research conducted an experiment using a coating agent mixed with TiO₂ photocatalyst to reduce NOx. Among the air pollutants, NOx and SOx, which are the precursors of secondary products that generate ultra-fine particles, can be reduced by using TiO₂. The TiO₂ photocatalyst can be used by mixing with building materials, which can reduce particulate matter. ISO 22197-1, a test method that can evaluate the NOx reduction of TiO₂ photocatalyst, was conducted by applying the same test method, and the concentration of NO gas in the atmosphere was lower than 1.000 ppm, so the concentration change was confirmed at 0.500 and 0.250 ppm. The reduction of NOx and NO was confirmed through experiments, and further research on the change in NOx concentration of equipment using methods that can be applied in real life, such as residential facilities and multi-use facilities, is deemed necessary.
실험실에서 UV 광량 변화에 따른 광촉매 코팅제의 실내공기오염물질(HCHO) 저감 실험
유재윤(Yoo, Jae Yun),송용우(Song, Yong Woo),박진철(Park, Jin Chul) 대한건축학회 2021 대한건축학회 학술발표대회 논문집 Vol.41 No.2
Indoor air pollutants are classified as organic, inorganic, and biological. Indoor environmental pollution is affected by environmental conditions such as ventilation, temperature, and humidity. Affected by pollutants emitted from building materials, etc. TiO₂ photocatalysts can be applied to remove them. In this study, the effect of reducing HCHO, one of the indoor pollutants, was confirmed by applying TiO₂ photocatalysts. The test method proposed in ISO 22197, and the reactor was manufactured and experimented accordingly. As a result, The increase in UV-A light intensity also increased the decrease in HCHO, and the increase in the decrease was not uniformly increased. It is planning to conduct a change experiment in the efficiency of removing HCHO according to the processing flow rate inside the reactor.
무인항공기 신뢰성 및 안전성 확보를 위한 설계 프로세스 적용 사례 연구
유재윤(Jaeyoon Yoo),김종운(Jongwoon Kim),김영선(Youngseon Kim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
무인항공기는 외부 환경을 인식해 스스로 상황을 판단하여 이동하고, 필요시에는 임무를 수행할 수 있는 공중을 비행하는 무인 이동체이다. 상업용 무인항공기의 세계 시장 규모는 매년 증가하고 있으나, 이에 비례하여 사고 사례 또한 증가하고 있다. 하지만 국내 무인항공기 제작사들은 하위 부품들을 구매하여 그것들을 조립 후 납품하는 중소기업들이다. 그리고 대부분 제작사들이 비행 및 임무 성능에 대한 시험은 수행하나 설계 시 신뢰성/안전성에 대한 고려가 부족하다. 또한 국내외 정책 및 표준 개발이 진행 중으로 제작사에서 이를 설계 과정에서 적용하기 어려운 실정이다. 따라서 본 연구에서는 일반적인 무인항공기를 대상으로 설계 프로세스를 통해 신뢰성 및 안전성 분석을 수행하고, 요구사항을 도출하여 무인항공기 개발 시 이를 반영하고자 하였다. 우선 기존 타 시스템의 프로세스를 바탕으로 무인항공기에 적합하도록 신뢰성/안전성 확보를 위한 설계 프로세스를 구축하였다. 또한 해당 프로세스를 무인항공기에 적용하여 PBS를 정의하고 신뢰도를 예측하였으며 FMECA 등의 신뢰성 분석을 통해 신뢰성 및 안전성 측면의 요구사항을 도출하였다. An unmanned aerial vehicle is an unmanned vehicle that recognizes the external environment and moves on its own by judging the situation, and flies in the air where it can perform its mission if necessary. The global market size for commercial unmanned aerial vehicles is increasing every year, but the number of accidents is increasing proportionately. However, local unmanned aerial vehicle manufacturers are small and medium-sized companies that purchase sub-parts, assemble and deliver them. And while most manufacturers conduct tests on flight and mission performance, they lack reliability/safety considerations in their design. In addition, domestic and foreign policies and standards are under development, and it is difficult for manufacturers to apply them in the design process. Therefore, this study intended to conduct reliability and safety analysis for general unmanned aerial vehicles through the design process, derive requirements, and reflect them in the development of unmanned aerial vehicles. First of all, the design process for securing reliability/safety was established to suit unmanned aerial vehicles based on the processes of existing other systems. In addition, the process was applied to unmanned aerial vehicles to define PBS, predict reliability, and reliability requirements were derived through reliability analysis such as FMECA.
공동주택 겨울철 외기 노출 배관의 표면온도측정을 통한 열 손실량
유민상(Min Sang Yoo),김성은(Seong Eun Kim),송용우(Yong Woo Song),정용기(Yong Gi Jung),유재윤(Jae Yun Yoo),박진철(Jin Chul Park) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
This study analyzed the pipe heat loss by measuring the surface temperature of exposed pipes in apartments. The most common method of preventing pipe heat loss is the construction of insulation materials, and the amount of heat loss varies depending on the outdoor conditions and the thickness of the insulation materials. The surface temperature of hot water and heating water pipes and pipes insulation in Apartment A was measured, and the flow rate was measured to find the flow rate. Based on the data, pipe heat loss according to outdoor air temperature was analyzed and predicted, and additional research direction was presented.