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판상형 계단식 공동주택 피난계단의 유지실태 및 피난 영향 분석
정현재(Hyeon-Jae Jeong),이병권(Byeong-Kwon Yi),안영철(Young-Chull Ahn) 대한설비공학회 2010 대한설비공학회 학술발표대회논문집 Vol.2010 No.6
According to the population and housing census in Korea, more than 50% of peoples live in apartments and enjoy many advantages of urban life, but the risks of a fire become increase because of high population density. In this study, escape safety from a flat type apartment is evaluated by resident’s surveys and computational simulations. The escape times are 580sec. with obstacles and 500sec. without obstacles, respectively. It shows 80sec. of significant escape delay. The survey shows that they don’t know the exact usage of a fire protection door. In the fire simulation, the time which has minimum visibility distance of 5m is calculated as 300sec. at the elevation of 1.5m from the floor.
수직샤프트를 통한 주방배기의 수직 구획별 배기 특성에 관한 연구
이병권(Byeong Kwon Yi),정현재(Hyeon Jae Jeong),안영철(Young Chull Ahn) 한국실내환경학회 2010 한국실내환경학회지 Vol.7 No.4
Recently a high-rise building is built in many places. However some problems are occurred in the high-rise buildings. Especially, at the case of the kitchen exhaust using vertical shaft, the kitchen exhaust fan sometimes can not work normally because of unbalance of pressure inside the shaft. In this study, under the assumption that the kitchen exhaust system applied uniformly can not cope with the various changes of the outside environment, the vertical sectional characteristics of a kitchen exhaust using vertial shaft is analyzed. Outside temperature, number of the floors and operating ratio of the vertically connected fan are selected as major parameter. And it is analyzed by a network simulation method. In case of 60 stories building, the standard deviations are 115.6 at the second floor, 74.9 at the 30th floor and 20.7 at the 60th floor. The standard deviation at the lower part is about 5.5 times than the upper part. So the results of the simulation show that the kitchen exhaust system should be installed considering the vertical sectional exhaust characteristics.
Survey on the Use of Farming Materials in the Elementary School Vegetable Garden in Jeonbuk Area
이상미,장윤아,채영,한경숙,이병권,정순진,김경미 인간식물환경학회 2018 인간식물환경학회지 Vol.21 No.6
The purpose of this study is to analyze the patterns of farming materials required for creating and operating elementary school vegetable gardens and to propose a plan for vitalizing business related to urban agriculture. As a result of the survey, the farming materials purchased most for the operation of the school gardens were seeds materials focused on seedlings, compost/fertilizer, and farming tools focused on trowels, sprinklers, and hoes. Purchases of farming materials were made mostly through the internet, while most purchases of seedlings were made in pesticide stores. Therefore, it is necessary to provide information and education related to the use of farming materials. Thus, establishment and maintenance of highly accessible and reliable internet sources are recommended to provide the lists of farm products necessary as well as related information to help users in purchase and use in order to create and operate the school garden. In order to supply high-quality seedlings, it is necessary to provide information and education on the kinds of seedlings, management, cultivation, delivery methods, and the like, focusing on pesticide stores producing and distributing seedlings. Providing such information for participants will improve their satisfaction. Also, if businesses related to urban agriculture use these study results in producing, preparing, managing and selling seedlings and farming materials, they will also be able to generate profits and vitalize urban agriculture.
김주형,강은주,김근용,정해진,이기택,Matthew S. Edwards,박명길,이병권,김광용 한국조류학회I 2015 ALGAE Vol.30 No.2
Studies on carbon flux in the oceans have been highlighted in recent years due to increasing awareness about climate change, but the coastal ecosystem remains one of the unexplored fields in this regard. In this study, the dynamics of carbon flux in a vegetative coastal ecosystem were examined by an evaluation of net and gross ecosystem production (NEP and GEP) and CO2 exchange rates (net ecosystem exchange, NEE). To estimate NEP and GEP, community production and respiration were measured along different habitat types (eelgrass and macroalgal beds, shallow and deep sedimentary, and deep rocky shore) at Gwangyang Bay, Korea from 20 June to 20 July 2007. Vegetative areas showed significantly higher ecosystem production than the other habitat types. Specifically, eelgrass beds had the highest daily GEP (6.97 ± 0.02 g C m-2 d-1), with a large amount of biomass and high productivity of eelgrass, whereas the outer macroalgal vegetation had the lowest GEP (0.97 ± 0.04 g C m-2 d-1). In addition, macroalgal vegetation showed the highest daily NEP (3.31 ± 0.45 g C m-2 d-1) due to its highest P : R ratio (2.33). Furthermore, the eelgrass beds acted as a CO2 sink through the air-seawater interface according to NEE data, with a carbon sink rate of 0.63 mg C m-2 d-1. Overall, ecosystem production was found to be extremely high in the vegetated systems (eelgrass and macroalgal beds), which occupy a relatively small area compared to the unvegetated systems according to our conceptual diagram of a carbon-flux box model. These results indicate that the vegetative ecosystems showed significantly high capturing efficiency of inorganic carbon through coastal primary production.
김종원(Jong-Won Kim),안영철(Young-Chull Ahn),이병권(Byeong-Kwon Yi),정현재(Hyeon-Jae Jeong) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
In the perspective of saving energy in buildings, the high performance of insulation and air tightness for improving the heating and the cooling efficiency, has brought economicaliy positive effects. However, these building energy saving technologies cause the lack of ventilation, which is the direct cause of increasing the indoor contaminants, and is also very harmful to the residents, because they spend over 90% of their time indoors. Therefore, the ventilation is important to keep the indoor environment clean and it can also save the energy consumption. In this study, a HEPA type nano ceramic filter is designed as a passive ventilation system to collect airborne particles and to supply fresh outdoor air. The double layer filter, which has 30㎛ in diameter at the conditions of 10wt% of concentration and 3㎸/㎝ of the electric intensity, is produced by electrospinning. The filtration coating technology is confirmed in the solution with SiO₂ nano particles using polymer nano fibers. Also double layer filters are coated with SiO₂ nano particles and finally the porous construction materials are made by sintering in the electric furnace at 200~1400℃. The efficiency is measured 96.67% at the particle size of 0.31㎛, which is slightly lower than HEPA filter. However the efficiency is turned out to be sufficient.
김종원(Jong-Won Kim),안영철(Young-Chull Ahn),이병권(Byeong-Kwon Yi),정현재(Hyeon-Jae Jeong) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.1
Airborne particulate matters have two modes of size distributions of coarse mode and fine mode. The coarse mode which is formed by break down mechanism of large particles has a peak around the 100 ㎛, and the fine mode formed by condensation and build up mechanism of evaporated vapors has a peak at several ㎛. The coarse mode particles can be removed easily by conventional collecting equipments such as a cyclone, an electrostatic precipitator, and a filter, however the fine mode particles can not be collected easily. Usually the fine mode particles are generated in the high temperature conditions especially through boilers and incinerators, so the high efficient and temperature filter is essential for the filtration. In this study, a nano ceramic filter for the removal of fine particles in the high temperature is developed and tested for several characteristics. The nano ceramic filter has double layer of micro and nano structure and the pressure drop and the filtration efficiency for 0.31 ㎛ at 3 ㎝/s are 15.45 mmAq, and 96.75%, respectively. The thermal conductivity is 0.038 W/m?K, and the coefficient of water vapor permeability is 3.63 g/㎡?h?㎜Hg. It is considered that the sensible heat exchange rate is very poor because the low thermal conductivity but it has high potential to exchange latent heat.