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소규모 건축물 건축자재의 습열특성 국제기준 부합 DB구축을 위한 연구
안호상(Hosang Ahn),강재식(Jae Sik Kang),최경석(Gyoung Seok Choi),최현중(Hyun Jung Choi),정병권(Byeongkwon Jeong) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-
In this study, Korean building materials will be examined and analyzed to establish hygrothermal properties of Korea building materials database. To establish database of Korea building materials, widely used materials in current construction markets are investigated and selected to representative samples. After that, materials database of WUFI(Wärme Und Feuchte Instationär), which is mostly used building simulation software for heat and moisture transport in worldwide, will be analyzed in terms of physical and hygrothermal properties. International standards such as ISO, EN, and DIN will be summarized and compared with Korean Standard(KS) in terms of test method and performance values. Property items, missing or not meeting the international standards of KS will be checked. It is our expectation that material database of Korean building materials can be applicable to building remodelling technology development. As part of building design, input data considering heat and moisture transport can more precisely simulate the whole building energy usage and consequently attributed to reduce energy consumption.
자발적 중재를 통한 체내 내분비계교란물질의 저감 효과: 환경성 페놀 화합물
최인자(Inja Choi),김원(Won Kim),최혜영(Hyeyoung Choi),신호상(Hosang Shin) 환경독성보건학회 2021 한국독성학회 심포지움 및 학술발표회 Vol.2021 No.5
일상생활에서 내분비계교란물질(Endoceine Disrupting Chemucals, EDCs)에 대한 노출은 매우 흔하다. 그러나 소변이나 혈액 등 생체시료에서의 검출, 사람에 대한 건강영향, 노출원에 대한 정보 그리고 규제 등은 여전히 제한적이다. 본 연구의 목적은 연구 참여자가 중재 가이드라인을 사용하기 전과 후의 소변을 채취하여 알킬페놀류(t-BP, n-PP, t-OP및 n-OP), 클로로페놀류(2,4-DCP, 2,5-DCP, 2,4,5-TCP 및 2,4,6-TCP), 비스페놀류(BPA, BPS, BPF), 파라벤류(MePB, EtPB, PrPB 및 BuPB), 벤조페논(BP-3), 트리클로산(TCS)등 총 17종의 환경성 페놀 화합물의 농도 감소에 기여했는지를 확인하는 것이다. 중재 가이드라인은 생활방식, 개인위생용품, 화장품, 세제 및 세척제 사용, 식이섭취 그리고 플라스틱 용기 사용 등 6개 영역이 포함되었다. 총 279명의 여성은 중재 전과 후에 각각 1회씩소변시료를 채취하였고, 중재는 14일 동안 진행하였다. 설문조사와 14일 동안 다이어리를 작성하였다. 소변 중 환경성 페놀 농도는 가수분해시킨 후 on-line SPE LC/MSMS를 이용하여 분석하였다. 자발적 중재 후에 연구 참여자의 소변 중 BPA, BPS, TCS, BP-3, MePB, EtPB 및 PrPB 농도는 21.5~68.3% 감소하였다(p<0.05, 단 BPA p=0.106, TCS p=0.054). 바디워시는 BPA, TCS 및 PrPB, 액상 손세정제는 TCS, MePB 및 PrPB, 헤어에센스/로션은 BPA와 PrPB, 포장음식은 TCS, 장류 등의 섭취는 BP-3와 PrPB 그리고 식기 이외의 플라스틱 용기는 BPS와 TCS 농도 감소에 기여하였다(p<0.05). 결론적으로 본 연구에서 활용한 중재 가이드라인은 연구 참여자의 일부 EDCs의 바디버든을 줄이는데 효과적이었으며, 자발적 중재를 통해 그 효과를 평가했다는 점에서 의의가 있다.
최현중(Hyun Jung Choi),허정호(Jung Ho Huh),강재식(Jae-Sik Kang),최경석(Gyeong-Seok Choi),안호상(Hosang Ahn) 한국생활환경학회 2021 한국생활환경학회지 Vol.28 No.2
In this study, lon-term aging of XPS (Extruded PolyStyrene) and Rigid poly urethane was experimentally observed by two step process to verify correction factors. Continuous measurement over 5,300 days was performed in first step by checking thermal conductivity change. In 2<SUP>nd</SUP> step process, 360 day-time-lapse monitoring was executed. As a result, it was degraded for special grade and grade 1 XPS by 30% from the original thermal conductivity for 1,000 day-time-lapse and 20 to 25% for grade 2 XPS. In case of Rigid poly urethane, degradation from the initial ratio was found to be 23 to 29% after 5,000 days. Based on these results, correction factors were calculated and suggested to have 0.7, 0.75, and 0.8 for special grade XPS, grade 1 XPS, and Rigid poly urethane, respectively.
슬라이스 가속 시험법에 따른 건축용 단열재의 성능 분석
최현중(Hyun Jung Choi),허정호(Jung Ho Huh),강재식(Jae-Sik Kang),최경석(Gyeong-Seok Choi),안호상(Hosang Ahn) 한국생활환경학회 2021 한국생활환경학회지 Vol.28 No.2
Thermal property degradation of building insulation materials were analyzed by accelerated laboratory methods defined in ISO 11561 to verify thermal resistance change experimentally. Selected samples varied within one to three days from production date. Primary tests were executed for more than 3,000 hrs for XPS (Extruded PolyStyrene) and Rigid poly urethane, respectively. Secondary tests were carried out for approximately 1,500 hrs for special and first grade of XPS. Measured values of thermal resistance were analyzed to estimate the thermal resistance values of 25 year-time-lapse and to compare with 25 year-average value. It was observed that thermal property of special grade XPS was estimated to decrease after 25 years by 37 to 41% from the initial value. Grade 1 XPS showed relatively better results as of 21 to 27%. In addition, Rigid poly urethane 40K revealed property degradation pattern of 21 to 27% from the production stage.
최호상 慶北工業專門大學 1984 論文集 Vol.21 No.-
This study was carried out to investigate a hydrodynamic characteristics and mass transfer effect by using reciprocating perforated-plate column for distilled water-ethyl acetate-kerosene system. It was analysed dispersed phase holdup, dispersion coefficient, and mass transfer coefficient by experiment. The experimental results show that dispersed phase holdup has been influenced on superficial velocity, and dispersion coefficients are linearly. For mass transfer effect, it was known to have been quite good from dispersed phase to continuous phase by pulsing.
도로곡률에 따른 AFLS 전조등 최적 회전각도에 관한 연구
이호상(Hosang Lee),강병도(Byungdo Kang),김형구(Hyounggu Kim),최영태(Youngtae Choi),황재형(Jaehyung Hwang) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Headlamps are important safety components in ensuring good forward visibility and informing oncoming vehicles of their own presence at night. Lots of new technology were applied in headlamps. AFLS(Adaptive Front Lighting System) means a lighting device, providing beams with differing characteristics for automatic adaptation to varying conditions of use of the dipped-beam and main-beam. In this paper, Optimum swivel angle of AFLS headlamp were investigated using two kinds of prototypes of head lamp. Visibility of AFLS headlamp was evaluated using the eye mark camera in various road conditions such as highway and national road. As a result, optimum swivel angel of AFLS head lamp was 19° considering a variety of road curvature and No glare swivel angle was 24°. AFLS head lamps were very useful to improve visibility during driving at night.
건축자재 습열특성 측정 국제기준 및 실험법 고찰(열-물, 수증기 거동 중심으로)
안호상(Hosang Ahn),최경석(Gyeong-seok Choi),강재식(Jae Sik Kang),이한솔(Han Sol Lee) 대한설비공학회 2020 대한설비공학회 학술발표대회논문집 Vol.2020 No.6
Climate change has caused lots of severe weather change such as sea water temperature rise, particulate matter issue, yellow dust outbreak increase, heavy rainfall and heat wave. These weather change induced an inevitable reduction of energy consumption, especially in the amount of carbon dioxide emission. Ministry of land, infrastructure and transportation in Korea announced secondary green building act in 2020 and it plans to implement energy consumption reduction in building by applying zero energy building technology and spread into private sectors by 2030. To achieve the practical outcome, insulation material and installation technology need to be upgraded and standardized. In this study, five constant temperature and humidity room were constructed and tested for stabilization. Experimental conditions to measure hygrothermal properties of building materials were studied in accordance with the guideline of Fraunhofer IBP as an international joint research partner. Several international standards such as ISO 12570,12571,12572 and 15148 were studied and experiment apparatus and specific conditions were followed. Temperature and relative humidity of each room were monitored per one hour, respectively. Depending on the results of each room, additional installation to stabilize the temperature and humidity in a room was carried out.