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디스플레이 산업단지 폐수처리장 온배수로부터 발생하는 안개 저감 연구
황재석,황재석,한창호,김경태 한국도시환경학회 2018 한국도시환경학회지 Vol.18 No.3
The hot waste water from the display industrial complex affects the traffic and the surrounding environment due to fog generation in the surrounding area in winter. A simulator was built to predict the occurrence of fog due to temperature changes. Humidity change was measured after setting the temperature and ambient temperature of the hot water. The evaporation rate was compared at the reservoir discharging the hot water. When the temperature was 28oC and the atmospheric temperature was -5oC, the evaporation rate rapidly saturated to 0.9 cm/day or more. It was found that the temperature difference between the water and the atmosphere in winter exceeded the fog generation criterion of 8oC, and the evaporation amount easily changed to fog. The calculated results from the relative humidity using the simulator were in good agreement with the evaporation rate. When the temperature of the hot water is cooled from 28oC to 21oC, it is confirmed that the amount of evaporation can be reduced by 33% that result in decrease of fog generation. 디스플레이 산업단지에서 배출된 온배수가 동절기에 주변지역에 안개발생으로 교통 및 환경에 영향을 미치므로 대기기온의 변화에 따른 안개 발생을 예측하기 위해 시뮬레이터를 제작하여 온배수의 온도변화와 주변환경 온도범위를 설정한 후 습도변화를 측정하였다. 또한 온배수가 배출되는 저수지와 하천에서의 안개 발생환경에서 증발속도와 증발량을 비교 하였다. 동절기에 온배수가 28oC로 배출되고 대기온도가 -5oC인 경우 증발속도는 0.9 cm/day 이상으로 빠르게 포화되고, 동절기 수온과 대기의 온도차가 안개발생 기준인 8oC를 훨씬 초과하고 있어 증발량이 안개로 쉽게 전환됨을 알 수 있다. 시뮬레이터를 이용한 상대습도로 부터 계산된 결과와 증발속도는 잘 일치하였으며, 온배수의 배출온도를 28oC에서21oC로 냉각할 경우 약 33%의 증발량을 감소시켜 안개발생을 저감 할 수 있음을 확인하였다.
순수 비틀림 모멘트를 받는 직교 이방성체의 광탄성 시험법 개발에 관한 연구( I )-차원 광탄성 실험법 모델의 절단법과 $G_{i} 와 f_{ij}$ 의 측정법 -
황재석,방창일 대한기계학회 1991 대한기계학회논문집 Vol.15 No.2
To develop the photoelastic experiment method for the orthotropic material under pure torsional moment is the main objective of this research. In the development of photoelastic experiment for orthotropic material under pure torsional moment, the important problems and their solutions are the same as following. In the model material for photoelastic experiment, it was found that C.F.E.C.(Copper Fiber Epoxy Composite) can be used as the model material of photoelastic experiment for orthotropic material. In the stress freezing cycle, it was assured that stress freezing cycle for epoxy can be used as the stress freezing cycle of the photoelastic experiment for orthotropic material. In the slicing method, it was found that the negative oblique slicing method can be effectively used as slicing method in 3-dimensional photoelastic experiment. In the measuring method of stress fringe values and physical properties in the high temperature, it was found that stress fringe values can be directly measured by experiment and physical properties can be directly or indirectly by equation between stress fringe values and physical properties developed by author. In the stress analysis method of orthotropic material under pure torsional moment by photoelastic experiment, it will be studied in the second paper.
황재석 대한간학회 2010 Clinical and Molecular Hepatology(대한간학회지) Vol.16 No.4(S)
Hepatitis C virus (HCV) infection is a major cause of chronic liver disease in western country. About 70% to 85% of infected patients develop into chronic hepatitis. Although advanced diagnosis and treatment of Chronic Hepatitis C (CHC) has been developed, the treatment outcome has not been satisfactory. However, after introduction of peg-interferon and ribavirin, the overall sustained viral response rate(SVR) of CHC increased to 50% to 60%. Moreover, with the genotype 2 patient SVR raised to 80%. This paper will review the treatment outcome of special patient groups, such as the patient with persistent normal ALT, liver cirrhosis, chronic kidney disease, older adult, and coinfection of CHB and CHC.
등방성/직교이방성 이종재료의 진전 계면균열에 대한 동적 광탄성 실험 하이브리드 법 개발
황재석,신동철,김태규,Hwang, Jae-Seok,Sin, Dong-Cheol,Kim, Tae-Gyu 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.7
When the interfacial crack of isotropic/orthotropic bi-materials is propagated with constant velocity along the interface, stress and displacement components are derived in this research. The dynamic photoelastic experimental hybrid method for the bimaterial is introduced. It is assured that stress components and dynamic photoelastic hybrid developed in this research are valid. Separating method of stress components is introduced from only dynamic photoelastic fringe patterns. Crack propagating velocity of interfacial crack is 69∼71% of Rayleigh wave velocity of epoxy resin. The near-field stress components of bonded interface of bimaterial are similar with those of pure isotopic material and two dissimilar isotropic bimaterials under static or dynamic loading, but very near-field stress components of bonded interface of bimaterial are different from those.