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황성완 ( Sung Wan Hwang ),김선희 ( Sun Hee Kim ) 한국보건정보통계학회 (구 한국보건통계학회) 2009 한국보건정보통계학회지 Vol.34 No.2
Objectives:This study aims to analyze the characteristics which new outpatients revisit in a hospital. Using this study, hospital managers can make efficient customer relationship. Methods:This is based on the medical record data of patients in the hospital. 9,392 outpatient`s cases were used, that patients visited the first time between August and September in 2003, and revisited till December in 2006. Results:In coefficient of determination of logistic regression, model 1 was 23.4%, Model 2 was 34.7%, model 3 was 23.2% and model 4 was 12.8%. Classification rate of model 1 was 74.1%, model 2 was 73.1%, model 3 was 68.6%, and model 4 was 65.5%. Conclusions:To make more useful model for other hospitals in Korea, each hospital manager needs to understand more of the hospital environment, the patient`s characteristics, and the business process.
한국채택 국제회계기준(K-IFRS)과 의료기관회계준칙에 관한 비교 연구
황성완 ( Sung Wan Hwang ),강정규 ( Jung Kyu Kang ) 경희대학교 경영연구원 2011 의료경영학연구 Vol.5 No.1
Recently, the Accounting Standards of many countries including the United States have shown the tendency to replace to International Financial Reporting Standards(IFRS). This study aims to compare the K-IFRS with the Hospital Accounting Systems Revision. Three important characteristics of IFRS are as follows. First, IFRS is the principle-based standards, on the other hand, Hospital Accounting Systems Revision in Korea version is the rule-based standards. Second, the financial statement of IFRS provides useful information throughout the consolidated financial statements, but healthcare institutions are based on the financial statements of each institution financial reporting. Third, assets and debt have estimated to be the acquisition cost in the healthcare institutions but they of IFRS will be estimated by the fair value. In order that the financial statements adopting the newly established K-IFRS can be used internationally, we have to be ready to the road-map for the full adoption of IFRS in Korea healthcare institutions from now on.
나노 다이아몬드 입자를 첨가한 엔진 오일의 알루미늄 6061 합금에 대한 마모 특성
황성완(Sung-Wan Hwang) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.12
Pin-to-disc wear testing experiments were conducted to investigate the wear characteristics of commercial oil(5W-40) with nano-diamond particles. The upper specimen was a SUJ-2 high-carbon chromium steel ball with a diameter of 4 mm, and the lower specimen was made of the Al-6061 alloy. The applied load was 5 N, and the sliding speed was 0.25 m/s. The wear tests were conducted at a sliding distance of 500 m. The friction coefficients and wear rates of the Al-6061 specimens were tested using commercial oil with different nano-diamond concentrations ranging from 0 to 0.02 wt.%. The addition of nano-diamond particles to commercial oil reduced both the wear rate and coefficient of friction of the Al-6061 alloy. The use of nano-diamond particles as a solid additive in oil lubricants was found to improve the tribological behavior of the Al-6061 alloy. For the Al-6061 alloy, the optimal concentration was found to be 0.005 wt.% in view of the friction coefficient and wear rate. Further investigation is needed to determine the optimal concentration of nano-diamond particles for various loadings, sliding speeds, oil temperatures, and sliding distances.