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윤성환 ( Yun Sung-hwan ),박창호 ( Park Chang-ho ),윤완석 ( Yoon Wan-seok ),박양흠 ( Park Yang-heum ) 한국구조물진단유지관리공학회 2021 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.25 No.2
본 연구는 고정하중 효과를 고려한 교량받침 앵커부 콘크리트의 파괴강도 평가 및 평가식 제안에 관한 연구이다. 고정하중이 작용되면 마찰력에 의해 수평 지진하중이 분산되는 효과가 발생되며, 압축력에 의한 구속효과로 앵커부 콘크리트 저항성능이 향상된다. 이를 검증하기 위해, 구조실험 및 수치해석이 수행되었고, 고정하중비 50%, 100%, 200%일 때 70% 이상 파괴강도가 증가되는 것으로 나타났으며, 고정하중 효과를 고려한 내진성능평가식을 제안하고자 한다.
가변난방도일법을 활용한 공동주택 외피단열사양의 민감도 분석
윤성환(Yoon Seong-Hwan),김영탁(Kim Young-Tag),장희경(Jang Hee-Kyung),김상우(Kim Sang-Woo) 대한건축학회 2009 대한건축학회논문집 Vol.25 No.12
This study is focused on design conditions for energy saving of apartment house and acquiring 1/2/3 rating by setting mean Q-value as main thermal performance variable. The conclusions are as follows. 1) 4,752 cases of total energy saving rate and heating load compared to standard model according to mean Q-value were analyzed. Heating load decreased 2GJ/yr as mean Q-value fell by 0.1 and the relation was linear. Total energy saving rate compared to standard model increased 5~6% as mean Q-value fell by 0.1. 2) In case mean Q-value is 1.50, total energy saving rate and heating energy consumption according to building direction, shading coefficient of window, the efficiency of boiler, the change of the building location. 3) By setting the variables related to building exterior thermal performance as independent variable and total energy saving rate as dependent variable, the equation between variables was deduced using multiple regression analysis to estimate total energy saving rate for getting the building energy efficient rating. It is expected that derived equation can be used to design apartment house for acquiring 1/2/3 rating by estimating total energy saving rate easily in an early design stage.
UV/persulfate에 의한 methylated arsenic 산화 연구
윤성환 ( Sung Hwan Yoon ),김태훈 ( Tae Hun Kim ),이면주 ( Myun Joo Lee ),유승호 ( Seung Ho Yu ) 한국공업화학회 2009 응용화학 Vol.13 No.1
UV/persulfate 반응을 이용하여 메틸화 유기비소의 산화연구를 수행하였다. UV/persulfate에 의한 메틸화 유기비소의 산화효율은 UV/H2O2보다 높은 것으로 나타났다. 또한 persulfate의 농도 또는 용액의 온도를 증가시킴으로써 UV/persulfate에 의한 메틸화 유기비소의 산화효율을 증가시킬 수 있었다. 본 연구의 결과는 sulfate radical(SO4-·)이 메틸화 유기비소의 산화에 매우 효과적임을 보여준다. The oxidation of methylated arsenic in aqueous solution was investigated using UV/persulfate reaction. The performance of UV/persulfate was higher than that of UV/H2O2. The oxidation efficiencies of methylated arsenic by UV/persulfate were increased with the increase in persulfate concentration or solution temperature. The results indicate that sulfate radical (SO4-·) is very effective for the oxidation of methylated arsenic.
원저 : 제주 지역 돼지 생식기 호흡기 증후군의 혈청학적 조사
윤성환 ( Sung Hwan Yoon ),손성원 ( Seong Won Sohn ),장원우 ( Won Woo Jang ),김성환 ( Seong Hwan Kim ),장소영 ( So Young Jang ),지영흔 ( Young Heum Jee ),김재훈 ( Jae Hoon Kim ),임윤규 ( Yoon Kyu Lim ) 한국수의공중보건학회 2010 예방수의학회지 Vol.34 No.4
Porcine reproductive and respiratory syndrome (PRRS) virus causes not only breeding disorder such as abortion, stillbirth and premature birth to pregnant sows but economic damage like high estrous return and low delivery rate. The presented study was conducted to confirm seroprevalence of PRRS in Jeju herds. PRRS positive rate was examined with pig serum from hog farms located in Jeju. Serum samples were extracted from the 11 of sow farms and 10 of hog farms, The groups were divided into 20, 40, 60, 80, 100 and older than 120 days of age and pregnant sows in hog farms. Anti-PRRSV antibody titers in sera were analyzed by ELISA. All the breeding farms and hog farms (10/10) showed PRRS positive except one breeding farm (1/11). Serological patterns determined by ELISA did not show any difference regardless of whether pigs were vaccinated or not. Nevertheless, the farms unvaccinated pigs displayed low productivity in terms of piglet loss rate and prolonged period of shipment. Therefore, vaccination against PRRSV appears to be a crucial factor in sanitary management of hog farms. Taken together, since PRRSV was spread widely in Jeju already, stabilization of sows by PRRS vaccination after adapting PRRSV free sow by all-in-all-out method in farms is recommended for the control strategy for PRRS.
윤성환(Sung Hwan Yoon),박정(Jeong Park),권오붕(Oh Boong Kwon),김정수(Jeong Soo Kim) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.39
Characteristics of lift-off propane flames diluted with nitrogen have been investigated experimentally to elucidate flame oscillations. Flame stability maps are compared for the fuel tube diameters of 0.3 and 1.0㎜ to clarify the flame oscillations. Flame oscillation modes are classified into three: a pure self-oscillation, a combined form of self-oscillation and buoyancy-induced oscillation, and a combined form of self-oscillation and diffusive-thermal instability. It is shown that the self-oscillation is not relevant to a diffusive-thermal instability and a hydrodynamic instability caused by buoyancy, and appears at all lifted flame conditions irrespective of fuel Lewis number. These experimental evidences are displayed through the analysis of power spectrum for temporal variation of lift-off height. The possible scenario of the self-excitation mechanism is also addressed.
석유수지 비중차를 이용한 고무아스팔트 도막-시트 복합방수의 부착성능 비교 연구
윤성환 ( Yoon Sung Hwan ),박완구 ( Park Wan Goo ),김동범 ( Kim Dong Bum ),박진상 ( Park Jin Sang ),오상근 ( Oh Sang Keun ) 한국건축시공학회 2017 한국건축시공학회 학술발표대회 논문집 Vol.17 No.2
The combined waterproofing technique, which forms the waterproofing layer of two or more substances, is characterized by forming a waterproof layer, which is characterized by the formation of waterproof layers and the thickness of the waterproofing layer is inherently formed. In this study, it is intended to verify the integrity of the material through the manufacture of materials for special purpose waterproofing methods, primarily for the manufacture of composite waterproofing materials and composite waterproofing methods using cement materials and materials.
질소 희석된 부탄 부상화염에 있어서 화염진동에 관한 연구
윤성환(Sung Hwan Yoon),박정(Jeong Park),권오붕(Oh Boong Kwon),김정수(Jeong Soo Kim) 대한기계학회 2010 大韓機械學會論文集B Vol.34 No.7
질소로 희석된 부탄 층류 부상 화염에서 발생할 수 있는 화염진동 메커니즘을 살펴보기 위하여 실험적 연구를 수행하였다. 화염 진동은 층류 자유제트 부상 화염에서 5가지 영역으로 구분되었다. 화염 안정화 영역 (Ⅰ), 열손실에 의한 진동 (Ⅱ), 열손실에 의한 진동과 부력에 의한 진동이 혼재된 영역 (Ⅲ), 열손실에 의한 진동과 화염날림 직전의 진동이 혼재된 영역 (Ⅳ), 그리고 열손실에 의한 진동, 부력에 의한 진동 및 화염날림 직전의 진동이 모두 혼재된 영역(Ⅴ). 각각의 화염진동의 특성을 규명하기 위해 화염의 시간에 따른 부상높이 변화에 대한 FFT분석을 수행하였고 각 영역에 관련된 무차원 변수와 스트라훌 수의 조합으로 특성화 작업을 수행하였다. The characteristics of lifted butane flames diluted with nitrogen have been investigated experimentally in order to elucidate the mechanism of individual flame oscillation modes. Flame oscillations in laminar free-jet lift-off flames are classified into the following five regimes: a stabilized lift-off regime (Ⅰ), a heat-loss-induced oscillation (Ⅱ), a buoyancy-induced oscillation along with a heat-loss-induced oscillation (Ⅲ), a combined form of an oscillation prior to blow-out and a heat-loss-induced oscillation (Ⅳ), and a combination of an oscillation prior to blow-out and a buoyancy-induced oscillation along with a heat-loss-induced oscillation (Ⅴ). The characterization of the individual flame oscillations modes are presented and discussed using Strouhal numbers and their relevant parameters by the analysis of the power spectrum for temporal variation of the lift-off height.