http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
구획모델을 이용한 주택에서 이산화질소의 발생강도 및 감소상수 동시 추정
양원호,손부순,손종렬,Yang Won-Ho,Son Bu-Soon,Sohn Jong-Ryeul 한국환경보건학회 2005 한국환경보건학회지 Vol.31 No.4
Indoor air quality might be affected by source strength of indoor pollutants, ventilation rate, decay rate, outdoor level, and so on. Although technologies measuring these factors exist directly, direct measurements of all factors are not always practical in most field studies. The purpose of this study was to develop an alternative method to estimate the source strength and deposition constant by application of multiple measurements. For the total duration of 60 days, indoor and outdoor $NO_2$ concentrations every 3 days were measured in 30 houses in Seoul, Asan and Daegu. Using a compartment model by mass balance and linear regression analysis, penetration factor (ventilation divided by sum of air exchange rate and deposition constant) and source strength factor (emission rate divided by sum of air exchange rate and deposition constant) were calculated. Subsequently, the source strength and deposition constant were estimated. Natural ventilation was $1.80{\pm}0.42\;ACH,\;1.11{\pm}0.50\;ACH,\;0.92{\pm}0.26\;ACH$ in Seoul, Asan and Daegu, respectively. Calculated deposition constant(K) and source strength of $NO_2,$ in this study were $0.98{\pm}0.28\;hr^{1}\;and\;16.28{\pm}7.47\;ppb/h,$ respectively.
양원호,윤성욱,권은경,김진호,손부순 한국실내환경학회 2009 한국실내환경학회지 Vol.6 No.1
The numbers of deaths attributed by tobacco smoking have remarkably increased, reflecting the smoking patterns of previous decades. Exposure to environmental tobacco smoke increases the prevalence of both upper and lower respiratory tract illnesses. Self-reports of direct and indirect smoking may not always be reliable in questionnaire method used epidemiology. A number of biochemical makers have been used to validate claims of indirect smoking among which the most widely used specific markers has been the nicotine metabolite cotinine. This study was conducted to evaluate the cotinine levels to determine smoking status. Biomoitoring to assess the validity of questionnaire method found that sensitivity and specificity coefficients of around 100% and 100% in direct smokers. On the other hand, sensitivity and specificity coefficients were 56.74% and 47.26%, respectively. This results suggest that indirect smoking status should be assessed by biomonitoring such as cotinine levels.
양원호,김홍석,현명택 제주대학교 공과대학 첨단기술연구소 2004 尖端技術硏究所論文集 Vol.15 No.2
Air pollution from auto-vehicle exhausted gas accounts for 70% of entire air pollution in Jeju. The introduction of electric vehicles which do not generate discharge emissions will improve the clean image in Jeju and boost tour industry. Driving tests have been conducted on the 5·16 and Ilju Roads to investigate the driving characteristics of electric vehicles, using Santa Fes provided by HyunDai Motor Co. The state of charging battery decreases rapidly on the uphill road of 546 Road, while it shows linear decreases on the flat road of Ilju Road. It is required to improve the charging ability of battery to adopt the electrical vehicle in Jeju.
두께가 변화하는 부재 내의 혼합모드 I / III 균열의 응력확대 계수해석 - 3차원 유한요소해석 중심으로 -
양원호,최용식,조명래 한국자동차공학회 1993 오토저널 Vol.15 No.2
Variable thickness plates are commonly encountered in the majority of mechanical/structural components of industrial applications. And, as a result of the unsymmetry of the structure or the load and the anisoptropy of the materials, the cracks in engineering structures are generally subjected to combined stresses. In spite of considerable practical interest, however, a few fracture mechanics study on combined mode crack in a variable thickness plate have carried out. In this respect, combined mode 1/3 stress intensity factors $K_{1}$ and $K_{3}$ at the crack tip for a variable thickness plate were obtained by 3-dimensional finite element analysis. Variable thickness plates containing a central slant crack were chosen. the parameters used in this study were dimensionless crack length .lambda. crack slant angle .alpha, thickness ratio .betha. and width ratio .omega. Stress intensity factors were calculated by crack opening displacement(COD) and crack tearing displacement(CTD) method proposed by Ingraffea and Manu. The effect of thickness ratio .betha. on $K_{1}$ is relatively great in comparison to $K_{3}$.