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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.
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.
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.
초속경 라텍스개질 콘크리트로 보강된 RC보의 비선형 휨해석
최성용(Choi, Sung-Yong),윤경구(Lee, Bong-Hak),김용빈(Kim, Yong-Bin),강문식(Kang, Mun-Sik) 한국산학기술학회 2010 한국산학기술학회논문지 Vol.11 No.11
라텍스로 개질된 콘크리트는 높은 휨강도 뿐만아니라 부착강도 및 투수저항성이 좋은 재료특성을 제공한다. 이러한 이점을 활용한 초속경 라텍스개질 콘크리트(VES-LMC)에 관련된 연구결과는 재료에 관한 것이 대부분으로, VES-LMC로 덧씌우기 보강된 RC 보의 부착 경계면 거동특성에 대한 체계적인 연구는 미진하다. 따라서 본 논문에서 는 VES-LMC로 보강된 철근콘크리트 보의 비선형 휨 거동에 대한 특성을 알아보고자 ABAQUS를 매개변수 연구를 수행한 결과 다음과 같은 결과를 얻을 수 있었다. 비선형 휨 해석을 위하여 본 논문에 적용된 모델의 적합성 여부를 확인한 결과 실험값과 비교적 유사한 경향을 보이는 것을 확인 할 수 있었다. 두께가 증가함에 따라 최대 저항강도가 증가하는 경향을 보여주었으며, 또한 강성 이 증가하여 내하력이 증진되는 결과를 확인할 수 있었다. 부착강도를 변 수로 해석한 결과, 전단강도가 증가함에 따라 휨 저항능력이 향상되는 결과를 확인 하였으며, 두 이질재료의 부착능 력이 구조물의 내하력에 지배적인 인자로 작용하는 것을 알 수 있었다. Latex modification of concrete provides the material with higher flexural strength, as well as high bond strength and reduced water permeability. One of the most advantages of the very early-strength latex-modified concrete (VES-LMC) could be the similar contraction and expansion behaviour to normal concrete substrate, which enable to ensure long-term performance. The purpose of this study was to parametric nonlinear flexural nonlinear analysis of RC beam rehabilitated by VES-LMC. The results were as follows; The flexural nonlinear analysis model of RC beam overlaid by VES-LMC in ABAQUS was proposed to predict the load-deflection response, interfacial stress, and ultimate strength. The proposed FE analysis model was verified by comparison of an experimental data and the FE analysis results. The FE analysis results showed that yield point as well as flexural stiffness increased as the depth increased; the stiffness of beam overall increased as the bond stiffness became larger; the bond strength between two different materials is a key factor in composite beam. A parametric study showed that an overlay thickness was a main influencing factor to the behavior of RC beam overlaid by VES-LMC.