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Fighting the COVID-19 pandemic: onsite mass workplace testing for COVID-19 in the Republic of Korea
Eunhye Seo,Eunchan Mun,Wonsool Kim,Changhwan Lee 대한직업환경의학회 2020 대한직업환경의학회지 Vol.32 No.-
The ongoing coronavirus disease 2019 (COVID-19) pandemic is causing tremendous damage globally. The Republic of Korea (ROK), a highly export-dependent nation, is a leader in the fight against the COVID-19 pandemic and coping well with the disaster. Like the drive-through COVID-19 testing, which reflects the brilliant flexibility of the Korean medical system, onsite mass workplace testing for COVID-19, which our hospital has been performing over the past few months, is a unique and valuable countermeasure. We believe it is time that the current health examination system for workers in the ROK considered the risk of transmissible diseases.
자동차 엔진 개스킷용 아크릴 고무의물리적 특성과 수명 예측에 관한 연구
이형석 ( Hyung Seok Lee ),도종환 ( Jong Hwan Do ),안원술 ( Wonsool Ahn ),김철 ( Cheol Kim ) 한국고무학회 2012 엘라스토머 및 콤포지트 Vol.47 No.3
자동차 엔진 개스킷용 아크릴 고무(ACM)의 재료 특성과 수명 예측에 관하여 연구하였다. 클로린 가교사이트를포함하는 ACM (Chlorine Cure-Site ACM)과 카르복실기 가교사이트를 포함하는 ACM (Carboxyl Cure-SiteACM)을 이용하여 최적상태의 배합물을 제작하여 특성을 살펴보았다. 엔진용 개스킷의 주요한 특성인 열과, 엔진오일에서의 압축영구줄음율을 시험 평가한 결과 Carboxyl Cure-Site ACM 배합물이 상대적으로 더 우수한 것으로나타났다. Carboxyl Cure-Site ACM 고무 재료에 대한 수명을 예측하기 위해 가속열노화시험을 수행하여 시간-온도 환산식인 아레니우스(Arrhenius) 관계식을 구하였다. Material characteristics and the prediction of life time of polyacrylic rubber (ACM) for automotive engine gasket were studied. Two kinds of ACM rubber compounds, having chlorine cure-site and carboxyl cure-site, were madewith optimum formulations and the properties of each materials were examined. As a test results for the thermal propertiesand compression set, which are very important in the application for the automotive engine gasket, the compound usingACM with carboxyl cure-site was evaluated as having a better characteristics than that of ACM with chlorine cure-site.Arrhenius relationship based on time-temperature superposition principle (TTSP) was obtained through the accelerated heataging test to predict the useful life-time for the compound using ACM with carboxyl cure-site.