http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
하시영(Siyoung Ha) 한국진공학회 2020 진공 이야기 Vol.7 No.2
The COVID-19 pandemis has spread to 214 countries and it was officially declared as a Pandemic by the WHO on the 11<SUP>th</SUP> March 2020. Its’s quickly evolving, as human-to-human transmission is occurring, and the number of mortalities and new cases is increasing by the day worldwide. The Pandemic has a long history and we can’t predict in the future about what mutations occur and how the virus spreads. The main ain of this Announcement is to provide information of present pandemic and diagnostic methods we will look at wats to prevent future disease X and Pandemic based on current literature.
풍동실험을 통한 방풍용 서양측백나무와 농업용방풍망의 공기역학계수 평가
이소진 ( Lee¸ Sojin ),하태환 ( Ha¸ Taehwan ),서시영 ( Seo¸ Siyoung ),송호성 ( Song¸ Hosung ),우샘이 ( Woo¸ Saemee ),장유나 ( Jang¸ Yuna ),정민웅 ( Jung¸ Minwoong ),조광곤 ( Jo¸ Gwanggon ),한덕우 ( Han¸ Dukwoo ),황옥화 ( Hwang¸ Okh 한국농공학회 2021 한국농공학회논문집 Vol.63 No.5
Windbreak forests, which have a windproof effect against strong winds, are known to be effective in reducing the spread of odors and dust emitted from livestock farms. The effect of reducing the spread of odors and dust can be estimated through numerical models such as computational fluid dynamics, which require aerodynamic coefficients of the windbreaks for accurate prediction of their performance. In this study, we aimed to evaluate the aerodynamic coefficients, Co, C<sub>1</sub>, C<sub>2</sub>, and α, of two windbreaks, Thuja occidentalis and a mesh net, through wind tunnel experiments. The aerodynamic coefficients were derived by the relation between the incoming wind speed and the pressure loss due to the windbreaks which was measured by differential pressure sensors. In order to estimate the change in the aerodynamic coefficient concerning various leaf density, the experiments were conducted repeatedly by removing the leaves gradually in various stages. The results showed that the power law regression model more suitable for coefficient evaluation compared to the Darcy-Forchheimer model.