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자동차 에어컨 시스템에서 이중관 열교환기가 성능에 미치는 영향에 관한 실험적 연구
강민웅(Minwoong Kang),윤길상(Kilsang Yoon),이대웅(Daewoong Lee) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
Mobile air –conditioning system efficiency become more important to improve fuel efficiency and reduce green housegas emissions, so internal heat exchanger(IHX) applications become necessary for R134a refrigerant air-conditioning system as well as anR1234yfrefrigerant air-conditioner. In this study, R134arefrigerant air-conditioning system was investigated with three different type of coaxial IHX. The experimental results showed three different types of IHX havethe similar cooling capacity, but spiral type IHX shows slightly better coefficient of performance(COP) than other type of coaxial type IHXs. Type 3 IHX increas COP about 0.5~1.5% and 0.9~1.0% than Type 1 IHX and Type 2 IHX respectively.
Incidence of Diabetes After Cancer Development : A Korean National Cohort Study
Hwangbo, Yul,Kang, Danbee,Kang, Minwoong,Kim, Saemina,Lee, Eun Kyung,Kim, Young Ae,Chang, Yoon Jung,Choi, Kui Son,Jung, So-Youn,Woo, Sang Myung,Ahn, Jin Seok,Sim, Sung Hoon,Hong, Yun Soo,Pastor-Barriu American Medical Association 2018 JAMA oncology Vol.4 No.8
<P>CONCLUSIONS AND RELEVANCE In this large Korean cohort, cancer development increased the risk of subsequent diabetes. These data provide evidence that cancer is associated with an increased risk of diabetes in cancer survivors independent of traditional diabetes risk factors. Physicians should remember that patients with cancer develop other clinical problems, such as diabetes, with higher frequency than individuals without cancer, and should consider routine diabetes screening in these patients.</P>
Won Sohn,Danbee Kang,Minwoong Kang,Eliseo Guallar,Juhee Cho,Yong-Han Paik 대한간학회 2022 Clinical and Molecular Hepatology(대한간학회지) Vol.28 No.4
Background/Aims: This study aimed to investigate the effect of hepatocellular carcinoma (HCC) surveillance using the Korea National Liver Cancer Screening Program on the receipt of curative treatment for HCC and mortality in patients with chronic liver disease. Methods: This population-based cohort study from the Korean National Health Insurance Service included 2003 to 2015 claims data collected from 1,209,825 patients aged ≥40 years with chronic hepatitis B, chronic hepatitis C, and liver cirrhosis. Patients were divided according to HCC surveillance using ultrasonography and serum alpha-fetoprotein every 6–12 months. The study outcomes were the receipt of curative treatment (surgical resection, radiofrequency ablation, or liver transplantation) and all-cause mortality. Results: The study population consisted of 1,209,825 patients with chronic hepatitis B, chronic hepatitis C, and liver cirrhosis (median age, 52.0 years; interquartile range, 46–55 years; 683,902 men [56.5%]). The proportion of participants who underwent HCC surveillance was 52.7% (n=657,889). During 10,522,940 person-years of follow-up, 74,433 HCC cases developed, including 36,006 patients who underwent curative treatment. The surveillance group had a significantly higher proportion of curative treatment for HCC than the non-surveillance group after adjusting for confounding factors (adjusted hazard ratio [HR], 5.64; 95% confidence interval [CI], 5.48–5.81). The surveillance group had a significantly lower mortality rate than the non-surveillance group (adjusted HR, 0.56; 95% CI, 0.55–0.56). Conclusions: HCC surveillance using the national screening program in patients with chronic viral hepatitis or liver cirrhosis provides better opportunity for curative treatment for HCC and improves overall survival.
( Dong Hyun Sinn ),( Danbee Kang ),( Minwoong Kang ),( Seung Woon Paik ),( Eliseo Guallar ),( Juhee Cho ),( Geum-youn Gwak ) 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.1
Aims: As effective and well tolerated treatments for hepatitis B are available, early identification of patients with hepatitis B could effectively decrease burden from hepatitis B. Recently, a consensus definition of late presentation of chronic viral hepatitis for medical care has been suggested, to help quantify the proportion of patients missing timely diagnosis and treatment. Yet, clinical implications at the population level are largely unexplored. Methods: We used person-level longitudinal National Health Insurance Service-National Sample Cohort registration and claims: data collected between January 1, 2002 and December 31, 2013. From this cohort, we identified newly-diagnosed hepatitis B related hepatocellular carcinoma (HCC) patients, and classified patients into ‘late presentation of hepatitis B’, who were diagnosed with HCC without a prior clinic visit for hepatitis B, “regular” or “irregular” visit, who were diagnosed with HCC who had regular or irregular pattern of outpatient clinic visits for hepatitis B before HCC diagnosis. Results: Over the years, the proportion of patients with late presentation decreased from 50.8% in 2003 to 23.1% in 2013. In multivariable analysis compared with patients in the regular visits group, patients with late presentation were more likely to be younger and to be in lower income percentiles. After adjusting for age, sex, year of HCC diagnosis, income percentile, and initial treatment, the hazard ratios (95% confidence intervals) for all-cause mortality comparing the late presentation and irregular visits groups to the regular visits group were 1.76 (1.42-2.18) and 1.31 (1.06-1.61), respectively. Conclusions: In this nationally representative population-based study, timely diagnosis and treatment was suboptimal at the population level up to recent years. More precise and intensive strategies to minimize late presentation for hepatitis B is needed, with a special attention to younger people and lower income levels.