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한방의료기관에서 치료하는 환자의 의료이용분석 -외래 및 재원입원환자의 성, 연령, 지역별 분석을 중심으로-
최성용,신현규,박해모,이선동,Choi, Sung-Yong,Shin, Hyun-Kyu,Park, Hae-Mo,Lee, Sun-Dong 대한예방한의학회 2012 대한예방한의학회지 Vol.16 No.2
Objective : This study aimed to analyze the utilization of Korean Medicine clinics, and high-frequent diseases by sex, age, and region of outpatients and inpatients Methods : The data for this study were "Report on Usage Patterns of Korean Medicine Clinics" issued by the Ministry of Health and Welfare in 2008. Descriptive analysis and correspondence analysis were used to find the patterns of patient's utilization by sex, age and region Results : Diagnosis and examination methods mostly consisted of the pulse for diagnosis. Treatment methods consisted of acupuncture, medical herbs in package, and insurance extract powder. Fee for consultation was paid by Korean Medicine insurance. Usage increased when people's age was over 20 and climaxed among people who were in their 40s and 50s and decreased gradually afterwards. Also, there were differences between the sexes. There were differences in high-frequent diseases by regions, and in usage of Korean Medicine clinics according to sex and age. Conclusion : It was found that there were differences in usage and patterns of Korean Medicine Clinics according to sex, age, and region.
부산시내 지하생활권의 공기오염도와 온열인자에 관한 조사연구
최성용,문덕환,이종태,송인혁,이채언,이승민,Choi, Sung-Yong,Moon, Deog-Hwan,Lee, Jong-Tae,Song, In-Hyuk,Lee, Cha-Eun,Lee, Sung-Min 대한예방의학회 1994 Journal of Preventive Medicine and Public Health Vol.27 No.3
For the purpose of preparing the fundamental data on air pollution in underground shopping center and also contributing to the health improvement of residents, the authors measured the level of $SO_2,\;NO_2,\;TSP,\;CO,\;CO_2$ and also some related factors as air temperature, air movement, relative humidity and mean radiation temperature at inside and outside of underground shopping center in Pusan from January to February and from July to August 1994. The results were as follows : 1. The mean concentration of CO within the underground shopping center was $3.1{\pm}1.3ppm$ in winter and $2.1{\pm}0.9ppm$ in summer. There was a negative correlation (p<0.01) between inner CO concentration and temperature in summer and no correlation between inner CO concentration and outer CO concentration in underground shopping center 2. The mean concentration of COE within the underground shopping center was $876{\pm}353ppm$ in winter and $757{\pm}125ppm$ in summer. There was a negative correlation (p<0.01) between inner $CO_2$ concentration and air movement in summer and positive correlation (p<0.05) between inner $CO_2$ concentration and outer $CO_2$ concentration in underground shopping center. 3. The mean concentration of $SO_2$ within a underground shopping center was $0.036{\pm}0.019ppm$ in winter and $0.040{\pm}0.013ppm$ in summer. There was a positive correlation(p<0.01) between inner $SO_2$ concentration and temperature in summer and positive correlation between inner $SO_2$ concentration and outer $SO_2$ concentration in summer and winter in underground shopping center. 4. The mean concentration of $NO_2$ within a underground shopping center was $0.052{\pm}0.038ppm$ in winter and $0.042{\pm}0.016ppm$ in summer. There was a no correlation between inner $SO_2$ concentration and thermal factors in summer and winter and low correlation between inner $SO_2$ concentration and outer $SO_2$ concentration in underground shopping center 5. The mean concentration of TSP within a underground shopping center was $430{\pm}214{\mu}g/m^3$ in winter, $366{\pm}73{\mu}g/m^3$ in summer, and very in excess of the atmospheric environmental quality standards of Korea ($150{\mu}g/m3{\downarrow}$). There was low correlation between inner TSP concentration and temperature in summer and high correlation between inner TSP concentration and outer TSP concentration in underground shopping center.
혼화재료의 치환에 따른 경량기포 콘크리트의 기초적 특성분석
최성용,신재경,정광복,한민철,한천구,Choi, Sung-Yong,Shin, Jae-Kyung,Jeong, Kwang-Bok,Han, Min-Cheol,Han, Cheon-Goo 한국건축시공학회 2007 한국건축시공학회지 Vol.7 No.2
This study investigated the fundamental properties of the lightweight foamed concrete depending on various admixtures, and the results were summarized as following. When 20% of cement kiln dust(CKD) and 0.002% of stabilizing agent were mixed to lightweight foamed concrete, it was necessary to use a superplasticizer because flowability was decreased. However, it could reduce sinking depth which were the extensive trouble of lightweight foamed concrete. Bulk density was divided into '0.4' and '0.5' grades on KS according to unit volume weight. The compressive strength was less than that of plain concrete when admixtures were applied, but the results exceeded the minimum strength of the each grades on KS. Totally, it is found that the combination of 20% of CKD and 0.002% of stabilizing agent makes it possible to reduce a sinking depth, recycle resources, and save cost when were mixed.
액화수소 누출에 따른 수소 확산에 대한 시뮬레이션 연구
최성용(Seong Yong Choi),오창보(Chang Bo Oh),이의주(Eui Ju Lee) 한국화재소방학회 2022 한국화재소방학회 학술대회 논문집 Vol.2022 No.춘계
최근 미래 에너지원으로서의 수소 에너지에 대한 관심이 매우 높아지고 있으며 이와 관련한 연구가 활발히 진행 중이다. 특히, 국내에서는 전기 자동차와 더불어 수소 연료전지 자동차에 대한 연구도 활발해지면서 수소활용에 대한 기대치가 높다. 수소를 에너지원으로 사용하기 위한 생산, 저장 및 수송 단계에서는 안전관점에서 고려해야 할 사항이 많다. 수소의 저장방식에 있어서 현재 국내에서 보편적으로 고압수소 저장방식을 사용하고 있으나 일반적으로 고압수소의 경우에는 안전관점에서 고려해야 할 사항이 많다. 그에 반해 액화수소 저장방식은 고압수소에 비해 대기압 기준으로 약 240배 많은 수소를 저장할 수 있어 대용량 저장에 유리하며 저압으로도 저장이 가능하므로 저장과 수송 면에서 장점을 가지고 있다. 향후에는 고압수소와 더불어 액화수소의 수요도 많을 것으로 예상되기 때문에 이에 대한 안전관리 방안에 대해 충분한 연구를 진행할 필요가 있다. 본 연구에서는 노르웨이 Gexcon사에서 개발한 상용코드 FLACS v20.1을 사용하여 액화수소 누출사고가 발생하였을 때 누출된 수소로부터 증발한 수소기체가 확산되는 과정에 대한 시뮬레이션을 수행하였다. 기존 실험연구를 참조하여 액화수소의 누출조건으로는 저장압력 10 barg 에서 3.5 ton 의 액화수소를 저장하고 있는 수소 저장탱크로부터 액체수소가 누출되는 것으로 가정하였다. 또한 액화수소는 1 inch 직경의 파이프를 통해 0.73 kg/s의 속도로 누출되는 것으로 사고 시나리오를 가정하였다. 시뮬레이션을 통해 수소 확산거리, 폭발한계를 이용한 위험거리 산정에 대해 검토하였으며 얻어진 결과는 액화수소 누출 실증실험을 진행한 DNV-GL에서 수행한 실험결과와 비교하여 해석의 예측성능을 검증하였다.