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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).
중·고령 골프리조트 이용자의 회복환경지각과 장소애착감 및 재방문의도의 관계
최석환(Suk-Hwan Choi),신제민(Jae-Min Shin) 한국복합리조트포럼 2023 관광체육연구 Vol.2 No.2
Purpose: The purpose of this study is to investigate the relationship among perceived restorative environment, place attachment and revisitation intention for golf resort customers of the middle-ages and the elderl. Method: To achieve the goal of this study, a total of 220 questionnaires were distributed. Out of those returned questionnaires, insincerely replied or double-replied questionnaires were excluded and finally 215 questionnaires were analyzed for this study. The data were analyzed by frequency analysis, reliability analysis, exploratory factor analysis, confirmatory factor analysis, correlation analysis, and structural equation modeling using SPSS Version 18.0 and Amos 18.0 program. Results: Main findings were as follows: First, perceived restorative environment had a positive effect on place attachment. Second, place attachment had a positive effect on revisitation intention. Third, perceived restorative environment had a no effect on revisitation intention. Fourth, place attachment mediated the relationship between perceived restorative environment and revisitation intention. Conclusion: In-depth consideration of the perceived restorative environment will be necessary as a strategy to improve the golf resort's sense of place attachment in order to not only attract customers but also to ensure a healthy and happy retirement for middle-aged and elderly golf resort users. Interdisciplinary Research Implications: The results of this study are meaningful in establishing strategies for attracting customers to golf resorts and providing basic data to continue the popularization of golf.
무용전공대학생의 무용정서표현성과 무용성취의 관계에서 자기관리의 매개효과분석
최석환(Choi, Suk-Hwan),조남흥(Cho, Nam-Heung) 한국사회체육학회 2014 한국사회체육학회지 Vol.0 No.58
The purpose of this study was to investigate the relationship model of emotion expression of dance, selfmanagement, dance achievement for dance major students. To acheive the goal of this study, a total 230 surveys collected from university in Seoul, Kyuggi areas were utilized for analyzing. frequency analysis, exploratory factor analysis, reliability analysis, confirmatory factor analysis and structural equating modeling were conducted using SPSS 18.0 and AMOS 18.0. Main findings were as follows: First, emotion expression of dance effect on dance achievement. Secondly, the self-management medaites between the dance major students’ emotion expression and the dance achievement but the mediating effect appears partially.