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최석환(Seock Hwan Choi),권태균(Tae Gyun Kwon) 대한비뇨기종양학회 2013 대한비뇨기종양학회지 Vol.11 No.1
The rapid and widespread use of prostate-specific antigen (PSA) screening into clinical field was based on the assumption that PSA may increase the chance of earlier detection and cure of prostate cancer with minimal harms. In US, the introduction of PSA testing nearly doubled the lifetime risk of receiving a diagnosis of prostate cancer. However, many studies reported that PSA screening also can increase overdiagnosis and subsequent overtreatment. To evaluate the value of PSA screening on prostate cancer mortality, numerous studies have been conducted with contradictory results. Moreover, most of them were not randomized, controlled study. Recently, early results of two large, randomized, controlled trials of screening have published. A European study showed a modest decrease in prostate-cancer mortality, whereas a United States study showed no decrease in prostate-cancer mortality. Considering these inconsistent results of trials, men considering prostate-cancer screening should be informed about the potential benefits and harms of screening and early treatment. In this article, we address the current status and value of PSA screening with the review of the literature on PSA screening for prostate cancer.
미세먼지 전구체(SOx) 생성에 미치는 유동층 연소로의 공정변수 영향
최석환 ( Seok-hwan Choi ),윤형선 ( Hyung-sun Yoon ),서성규 ( Seong-gyu Seo ) 한국환경기술학회 2021 한국환경기술학회지 Vol.22 No.2
In this study, SOx conversion rate of sulfur content in mixed anthracite was investigated, and factors affecting SOx generation due to each process parameters were analyzed. For this, first, the items necessary for process improvement were analyzed. Next, the optimum Ca/S molar ratio and the temperature in the furnace were derived. The effect of high-powder limestone on the desulfurization effect was tested. In addition, changes in the desulfurization efficiency according to the inorganic components in the coal were also tested. As a result of improving the optimum Ca/S molar ratio and the furnace temperature, the desulfurization efficiency increased from 83 % to 87 %. In the experiment using high powder limestone, the desulfurization efficiency increased from 87 % to 95.5 %. It is predicted that the SOx emissions by about 72.7 % will be reduced . It was found that the improvement effect converted to ultrafine dust emission was 64.6 %, which decreased 394 tons/year(2 units).