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논문 : 생존분석을 통한 아파트소유자의 소유기간 결정요인에 관한 연구
강희만 ( Hee Man Kang ),김정렬 ( Jung Ryol Kim ) 명지대학교 금융지식연구소 2013 금융지식연구 Vol.11 No.2
본 연구는 아파트소유자의 소유기간 결정요인에 관한 연구로 소유자의 소유기간을 종속변수로 하고 금리와 아파트가격, 매매가/전세가 비율, 소유자의 연령, 매 입시 대출 여부를 독립변수로 하 여 Cox비례위험모형을 적용해 실증분석 하였다. 금리상승은 소유자의 매각 확률을 높이며, 아파트 가격 상승은 소유자의 매각 확률을 감소시키는 것으로 나타났다. 가격상승으로 매매가/전세가 비 율이 상승하면 매각 확률이 감소하는 것으로 나타났다. 특히 자가비점유자의 매각 확률이 감소하는 것으로 나타났다. 소유자의 연령이 56세 이상인 경우 36세∼55세인 경우에 비해 매각 확률이 높은 것으로 나타났으며 아파트 매 입시 대출받은 소유자가 대출받지 않은 소유자보다 매각 확률 이 높은 것으로 나타났다. 이러한 분석결과는 아파트가 주거목적과 자본이득을 위한 재산증식의 목적으로 소유되고 있는 사실을 설명해주는 것으로 보인다. 실증분석결과로부터 다주택자들의 주택이 시장에 공급될 수 있도록 세제를 재조정할 필요가 있으며, 부동산 규제 및 정책도 시장여건 에 따라 신축적으로 운영하여 주택수요를 진작시킬 필요가 있다는 시사점을 얻을 수 있다. In this paper, we examine factors affecting the time to sell an apartment. We employ Cox Proportional-Hazards Regression using the data from a specific apartment complex. The estimation results show that an apartment owner is willing to sell an apartment when interest rate is rising, the price of an apartment is decreasing, the percentage of the transaction price relative to the Chonsei price is decreasing, and so on. Overall, our findings suggest that it is necessary to increase the supply of the rental apartments by the owner of more than one apartment, by giving them some incentives.
도로 비점오염 해석을 위한 ROADMOD개발 및 적용: 도로청소 효과 분석
강희만 ( Heeman Kang ),전지홍 ( Ji-hong Jeon ) 한국물환경학회(구 한국수질보전학회) 2021 한국물환경학회지 Vol.37 No.2
In this study, an Excel-based model (ROADMOD) was developed to estimate pollutant loading from the road and evaluate BMPs. ROADMOD employs the Chezy-Manning equation and empirical expression for estimating surface runoff, and power function for pollutant buildup, and exponential function for pollutant washoff in SWMM. The results of model calibration for buildup and washoff using observed data revealed a good match between the simulation results and the observed data. The long-term surface runoff and sediment simulated by ROADMOD demonstrated a good match with those by SWMM with 2 ~ 14% of relative error. The shorter sweeping interval (within 8 days) remarkably decreased sediment loads from the road. It was found that the effect of reducing sediment loads from the road was greatly affected not only by the sweeping interval but also by sweeping on the day before a rainfall event. The 48% of removal efficiency of sediment loads from the road was achieved with 26 times of road sweeping per year when sweeping was performed on the day before the rainfall event. A 4-day sweeping interval showed similar removal efficiency (48%) with 96 times of sweeping per year. It is considered that the road sweeping on the day before a rainfall event could maximize the effect of reducing the non-point source pollution from the road with minimization of the number of road sweeping. So, the road sweeping on the day before a rainfall event can be considered as one of the useful and best management practices (BMPs) on road.
고속도로 노면퇴적물의 특성 및 도로청소에 의한 입도별 제거효율 분석
강희만 ( Heeman Kang ),김황희 ( Hwang Hee Kim ),전지홍 ( Ji-hong Jeon ) 한국물환경학회(구 한국수질보전학회) 2021 한국물환경학회지 Vol.37 No.4
The removal efficiency of road-deposited sediment (SDR) by road sweeping was analyzed by performing particle size analysis before and after road sweeping at four highways during May to December 2019. The SDR accounted for the largest proportion in the range of 250 to 850 ㎛ and the degree of its proportion had an effect on the particle size distribution curve. The particle size distribution of the collected sediments showed a similar distribution at all sites. Below 75 ㎛, the removal efficiency of SDR showed a constant value around 40%, but above 75 ㎛, it increased as the particle size increased. The removal efficiency was 82-90% (average 86%) for gravel, 66-93% (average 79%) for coarse sand, 35-92% (average 64%) for fine sand, 29-69% (average 44%) for very fine sand, 19-58% (average 40%) for silt loading, 10-59% (average 40%) for TSP, 13-57% (average 40%) for PM10, and 15-61% (average 38%) for PM2.5. SDR removal efficiency showed an average of 69% for the four highways. It was found that if the amount of SDR was less than 100 g/m2, it was affected by the road surface condition and had a large regional deviation. As such, the amount of SDR and the removal efficiency increased. The fine particles, which have relatively low removal efficiency, contained a large amount of pollutants, which is an important factor in water and air pollution. Therefore, various measures to improve the removal efficiency of fine particles in SDR by road sweeping are needed.