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김별,임정수,조성백,황옥화,양승학,Kim, Byul,Lim, Joung-Soo,Cho, Sung-Back,Hwang, Ok-Hwa,Yang, Seung-Hak 한국축산환경학회 2014 한국축산시설환경학회지 Vol.20 No.2
The climate of the earth is expected to change rapidly and continuously. Despite climate change is expected to impact on productivity of crop and livestock, a study for adaptation and impact of livestock to global warming is not enough. This study was performed to develop a method to evaluate the effects of heat stress on dairy cattle. Feedlot environment and health status of livestock were measured through an infrared thermography camera and a temperature-humidity sensor. Environmental factors such as temperature and humidity were measured to calculate the Temperature humidity index (THI). The change of the milk yield was similar to THI data pattern, suggesting that THI might play an important role to predict the effect of climate change on dairy cattle. THI data would be useful to predict long-term climate change effects on dairy cattle with RCP8.5 scenario.
김별,황광일 한국마린엔지니어링학회 2022 한국마린엔지니어링학회지 Vol.46 No.6
The goal of this research was to propose the shape of a hydrogen fuel storage room according to the roof apex angle consid-ering structural and kinetic characteristics and to analyze the effect of improving ventilation performance accordingly. The computa-tional fluid dynamics (CFD) method was used to analyze the ventilation flow rate of the exhaust vent and average hydrogen concen-tration value by applying ship motion conditions in the proposed model. Consequently, compared with the flat roof model, the proposed model increased the ventilation flow rate by up to 106% and decreased the hydrogen concentration by up to 28%. Similarly, even in mechanical ventilation, the ventilation flow rate increased by up to 19.02% and the hydrogen concentration decreased by up to 32.97%. The proposed model with a roof apex angle of 120° for both mechanical and natural ventilation was ascertained as the most effective model for hydrogen exhaust. The numerical results are expected to be helpful for research on the design of hydrogen tank storage room shapes and ventilation systems to improve the ventilation performance of hydrogen-powered ships.
고온 환경이 젖소의 생산성 및 축사환경에 미치는 영향 연구
김별,임정수,조성백,황옥화,양승학,Kim, Byul,Lim, Joung-Soo,Cho, Sung-Back,Hwang, Ok-Hwa,Yang, Seung-Hak 한국축산환경학회 2014 한국축산시설환경학회지 Vol.20 No.2
Environmental heat stress by global warming has a severe effect on the productivity of livestock and, in particular, on that of dairy cattle. Heat stress during high temperature environment directly and indirectly affects milk yield, milk quality and physiological response. This study was conducted to investigate the effects of heat stress on productivity and physiological responses of livestock. Temperature-humidity data logger were established inside the feedlot for measuring real time changes in the feedlot environment. Milk was collected every day for analysing the productivity of dairy cattle. Blood sample and respiration of dairy cattle were collected once in a week for investigating the physiological response factors. Blood component concentration associated with lipolysis metabolism and milk production showed change during tropical night period. Temperature humidity index (THI) of a specific location inside the feedlot showed continuously high levels.