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안상모(Sang-Mo Ahn),이종아(Jong-Ah Lee),정준호(Jun Ho Jeong) 한국주택학회 2013 주택연구 Vol.21 No.1
본 연구는 2012년 8월 현재 한국주택금융공사의 주택연금 가입자를 대상으로 종신지급형과 종신혼합형의 상품선택에 미치는 요인들을 이항 로짓모형으로 분석하였다. 전국 차원의 분석에서는 주택가격이 높고, 가입연도가 빠를수록, 월지급액이 적은 고령자 가구일수록 종신혼합형 상품을 선택할 확률이 높았고, 또한 소득이 없고, 비수도권에 거주하고, 아파트이외 주택에 거주하는 고령자 가구일수록 종신혼합형 상품을 선택할 확률이 높은 것으로 나타났다. 수도권과 비수도권 간 상품선택의 결정요인에서 지역별로 일부 차이가 존재하였는데, 수도권의 경우 소득여부가, 반면에 비수도권의 경우 소득여부와 성별이 전국수준의 분석결과와는 달리 각각 통계적으로 유의하지 않게 나타났다. 이는 지역적 여건과 환경에 따라 상품선택에 미치는 요인이 지역별로 달라질 수 있다는 것을 시사한다. This study has analyzed the determinants of housing reverse mortgage products’ choices between the tenure and modified tenure one for total subscribers of the housing reverse mortgage of Korea Housing Finance Corporation as of August 2012 using a binary logit regression model. At the national level, the elderly households with higher housing price, earlier subscription year, and lower monthly allowance were significantly more likely to choose the modified tenure product. And also those without any incomes, living at other types of housing other than apartments and in the non-capital region had the more likelihood to select the modified tenure product. There was a regional difference in the determinants of the products’ choices between the capital and non-capital regions. Unlike the estimation result at the national level, the income variable was proved to be statistically insignificant for the former, while the income and gender variables for the latter, indicating that some selection factors can be spatially differentiated by specific regional characteristics and circumstances.
고형성분이 포함된 전단희석 유체의 선형(扇形) 분무노즐을 통한 미립화
안상모 ( S. M. An ),류성욱 ( S. U. Ryu ),이상용 ( S. Y. Lee ) 한국액체미립화학회 2008 한국액체미립화학회지 Vol.13 No.1
In the present work, atomization characteristics of shear-thinning liquid slurry discharging from fan spray nozzles were studied experimentally for spray painting applications. The effects of solid particle size and concentration on the properties (especially on the viscosity) of suspensions and mean drop size were examined by using model fluids. In the range of low particle concentration (below 3 wt%), the fluid viscosity was primarily determined by the particle size. On the other hand, in the range of high particle concentration (higher than 10 wt%), the agglomeration phenomenon and the oil absorption capability of solid particles played major roles in determining the fluid viscosity. In the high concentration region, which most of the paints belong to, the fluid became more viscous and the shear thinning behavior appeared more prominent as the particle concentration was increased. In this region, mean drop size(SMD) decreased more rapidly with the increase of the injection pressure. Also, SMD became larger with the higher particle concentration and the larger particle size.
고체 표면에 충돌하는 뉴턴 액적에 대한 최대 액막 직경 모델 검토
안상모(Sang Mo An),이상용(Sang Yong Lee) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.6
최대 액막 직경은 액적이 표면에 첪돌한 이후에 최대로 퍼질 수 있는 정도를 의미하며, 분무기술과 관련된 다양한 응용분야에서 분무성능을 결정하는 중요한 인자 중의 하나이다. 본 연구에서는 고체표면에 첪돌하는 뉴턴 액적에 대한 기존의 최대 액막 직경 모델들을 4 ≤ Re ≤ 11700, 23 ≤ We ≤ 786, 37.9° ≤θs ≤ 107.1° 범위에 해당하는 본 연구의 실험결과와 비교하여 검토하였다. 실험결과, 유체의 점도 및 첪돌속도에 비하여 표면 젖음성이 최대 액막 직경에 미치는 영향은 미미한 것으로 나타났다. 한편, 기존의 모델 중에서 Roisman (2009) 모델은 최대 액막 직경에 대한 실험데이터의 80%를 ±5% 이내로 예측함으로써 가장 우수한 예측성능을 보였다. The maximum spreading is the maximum extent to which a drop can spread after impacting on a surface. It is one of the crucial factors determining the spraying performance in many applications. In this study, the existing maximum spreading models for a Newtonian liquid droplet impacting on a dry solid surface were reviewed and compared with the experimental results over the ranges of 4 ≤ Re ≤ 11700, 23 ≤ We ≤ 786, and 37.9° ≤ θs ≤ 107.1°. The surface wettability was found to have only a minor influence on the maximum spreading, compared to the liquid viscosity and impact velocity. Among the models tested, the Roisman (2009) model showed the best agreement with the experimental results, matching 80% of the measured data within ±5%.
안상모(Ahn, Sang Mo),이종아(Lee, Jong-Ah),정준호(Jeong, Jun Ho) 한국부동산학회 2013 不動産學報 Vol.55 No.-
1. CONTENTS (1) RESEARCH OBJECTIVES The purpose of this study is to analyze spatial determinants of housing reverse mortgage applicants in Korea. (2) RESEARCH METHOD This study is based upon the Negative Binominal regression model with a focus of 211 shi-gun-gu in Korea. In order to analyze the spatial determinants of the frequency of housing reverse mortgage application, three sorts of exploratory variables are employed including demographic and social variables, regional income and housing value variables and dwelling variables obtained from Korea Housing Finance Corporation, Korea Statistics Office and Kookmin Bank. (3) RESEARCH FINDINGS Regional attributes are found to be determinant s of housing reverse mortgage application. Income and housing value related variables are important in an understanding of housing reverse mortgage application. In addition, housing dwelling factors such as the type of housing are significant in the application of housing reverse mortgage. 2. RESULTS This study shows that the regional high education level, the value of housing, the above average ratio of apartments in housing stock, the number of the elderly are positively related with the spatial distribution of housing reverse mortgage applicants, while the regional above average ratio of long-term living period, percapita income and a change in housing price are negatively associated with it. Moreover, there is a significant difference between the capital and non-capital regions in the applicants of housing reverse mortgage.
SOFC 시스템의 연료 개질기용 2-유체 노즐로부터 분사되는 등유 액적의 평균입경 측정
안상모(Sang Mo An),이치영(Chi Young Lee),이상용(Sang Yong Lee) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
In the present study, spray characteristics of kerosene discharging from a twin-fluid atomizer were examined experimentally for fuel reforming applications. Mean drop size(SMD) of kerosene was measured with wide range of air/liquid ratio and air cap diameter. Also, previous mean drop size correlations were evaluated and compared with the measured data. It was found that mean drop size was predicted most appropriately by Rizk and Lefebvre correlation over the entire experimental range. and it can be utilized for the practical operating conditions of a fuel reformer.
고체 표면에 충돌하는 뉴턴 액적에 대한 최대 액막 직경 모델 검토
안상모(Sang Mo An),이상용(Sang Yong Lee) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
The maximum spreading represents the maximum extent to which a drop can spread after impacting on a surface. It is one of the crucial factors determining the spraying performance in many applications. In the present study, the existing maximum spreading models for a Newtonian liquid droplet impacting on a dry solid surface were reviewed and compared with experimental results over the ranges of 4≤Re≤11700, 23≤ We≤786, and 37.9°≤θ<SUB>s</SUB>≤107.1°. The surface wettability was found to have a minor influence on the maximum spreading compared to the liquid viscosity and impact velocity. Among the models tested, the Roisman (2009) model showed the best agreement to the experimental result for 80% of the measured data within ±5%.