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[가솔린엔진부문] 배기계의 형상 변화에 따른 유동 및 배기가스 입자 분포에 관한 연구
신창현(Changhyun Shin),김호영(HoYoung Kim),박심수(Simsoo Park) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_1
It is very important to obtain the uniform flow distribution inside the exhaust system in order to use catalyst more effectively . In this study a computational study of 3-D unsteady compressible flow was performed. Since the total length of the exhaust system is given due to the limited layout, the optimization of exhaust system was achieved to obtain more uniform flow by changing the length of junction and diffuser without the change of the total length through the unsteady state analysis. Morever, a study was made to investigate how much the particles emitted out of engine affect flow distribution of the exhaust gases.
질산 저장탱크 방류벽의 불침투성 콘크리트 바닥에 대한 위험성 평가
신창현 ( Changhyun Shin ),박재학 ( Jai Hak Park ),윤준헌 ( Junheon Yoon ) 한국안전학회(구 한국산업안전학회) 2016 한국안전학회지 Vol.31 No.3
Considering the chemical reaction between concrete which is the raw material of the dike bottoms and hazardous chemicals, some chemicals can have negative effects on the impermeability of concrete dike bottoms. The impermeable standards for the concrete bottom of dikes have been made in the recent study, but the previous study was based on the exposure test to crude oil which is not corrosive and not related to the chemical reaction. It can be concluded that the test of crude oil can’t represent all kinds of hazardous chemicals, especially highly corrosive chemicals. Meanwhile, this study has conducted the exposure test to nitric acid that is strongly corrosive and very hazardous. The results have showed that nitric acid has been penetrated at the maximum penetration depth of 2.9 cm for 7 days and the impermeable standards are better than the germany standard. Through this study with severe chemical, the scientific basis on the installation standards of all dike bottoms which are generally used in the industry has been obtained.
( Changhyun Lee ),( Hae-ryong Yun ),( Young Su Joo ),( Sangmi Lee ),( Joohwan Kim ),( Ki Heon Nam ),( Jong Hyun Jhee ),( Jung Tak Park ),( Tae-hyun Yoo ),( Shin-wook Kang ),( Seung Hyeok Han ) 대한신장학회 2019 Kidney Research and Clinical Practice Vol.38 No.1
Background: Cardiovascular disease and chronic kidney disease share several common risk factors. The Framingham risk score is hypothesized to predict chronic kidney disease development. We determined if the Framingham risk scoring system can correctly predict incident chronic kidney disease in the general population. Methods: This study included 9,080 subjects who participated in the Korean Genome and Epidemiology Study between 2001 and 2014 and had normal renal function. The subjects were classified into low- (< 10%), intermediate- (10-20%), and high- ( > 20%) risk groups based on baseline Framingham risk scores. The primary endpoint was de novo chronic kidney disease development (estimated glomerular filtration rate [eGFR], < 60 mL/min/1.73 m2). Results: During a mean follow-up duration of 8.9 ± 4.3 years, 312 (5.3%), 217 (10.8%), and 205 (16.9%) subjects developed chronic kidney disease in the low, intermediate, and high risk groups, respectively (P < 0.001). Multivariable analysis after adjustment for confounding factors showed the hazard ratios for the high- and intermediate risk groups were 2.674 (95% confidence interval [CI], 2.197-3.255) and 1.734 (95% CI, 1.447-2.078), respectively. This association was consistently observed irrespective of proteinuria, age, sex, obesity, or hypertension. The predictive power of this scoring system was lower than that of renal parameters, such as eGFR and proteinuria, but increased when both were included in the prediction model. Conclusion: The Framingham risk score predicted incident chronic kidney disease and enhanced risk stratification in conjunction with traditional renal parameters in the general population with normal renal function.
ChangHyun Jin,Ye-Ram Kim,JaeYoung Shin,ByoungOk Cho,Ah-Reum Han Korean Society of Radiation Industry 2023 방사선산업학회지 Vol.17 No.4
Isoegomaketone(IK), isolated from the radiation-induced mutant cultivar of Perilla frutescens var. crispa, is a major phytochemical compound that has attracted attention in pharmacological research. In this study, we demonstrated that IK exerts anti-inflammatory and protective effects on human mast cells and in an atopic dermatitis mouse model. IK inhibited tumor necrosis factor-α(TNF-α), interleukin-6 (IL-6), and IL-8 expression in human mast cells (HMC-1) stimulated with phorbol myristate acetate(PMA) and calcium ionophore A23187 (PMACI). IK significantly reduced the PMACI-induced phosphorylation of ERK and JNK, but not p38. IK also inhibited the PMACI-induced phosphorylation of STAT1 and STAT3. Oral administration of IK in atopic dermatitis mouse model ameliorated skin inflammation severity, as measured by skin thickness and pro-inflammatory cytokine levels such as TNF-α, IL-8, IL-4, and IL-13. These results might suggest that IK is a potent therapeutic agent against skin inflammation and atopic dermatitis.