대학생의 기숙사 만족도에 관한 연구

우효진,채현길 한국부동산경영학회 2013 부동산경영 Vol.7 No.-

Today, it is important to apply facilities and amenities in dormitories in qualitative aspect. This study investigates the satisfaction for improving dormitories facilities targeting university students in Seoul who live a dormitory. It is required to improve noise in the bedroom, lounge and cafeteria, size of space in the toilet and indoor sports facilities, the location in the laundry and heating in the library. Among them, satisfaction regarding the noise is the lowest. Also, the lack of the private space was the biggest problem. The comparison between the old dormitory and the new dormitory showed that the bedroom satisfaction had the biggest average difference while there was almost no satisfaction difference in the cafeteria and library. It implies that there was more complaints against the size of space, heating, or noise in the bedroom in the old dormitory because the main objective of the private room was for sleeping. On the contrary, the subjects answered that they take the quality, taste, and quantity of the food as a priority rather than the facility in the cafeteria. And The library had no remarkable satisfaction difference The result of this study suggests that students who live in a dormitory want to need environment improvement such as private space.

내·외국인 투자자본흐름이 주식시장과 채권시장의 변동성에 미치는 영향

우효진,윤성민 한국자료분석학회 2012 Journal of the Korean Data Analysis Society Vol.14 No.6

This study examines whether capital flows, as a proxy for information arrival process, influence on the volatility of Korean stock and bond markets. After the capital flows, which measured with transaction value in both markets, were classified by domestic and foreign investors, we conduct the difference of information effects between both investors. The empirical results are as follows. Firstly, we found that total capital flows have insignificant explanatory power, as GARCH effects are not reduced, when lagged and contemporaneous variables are included in the conditional variance estimation of GARCH model, respectively. Secondly, when the total capital flows are decomposed into expected and unexpected components, the unexpected stock investments of both investors increase the stock market volatility. However, the foreigner’s expected stock investments decrease them. Thirdly, although the stock market volatility is risen by Korean’s expected bond investment activity, foreigner’s both investment activities don’t have any effects. 본 연구에서는 시장에 유입되는 자본흐름이 주식시장과 채권시장의 수익률 변동성에 영향을 미치는지를 분석하였다. 정보흐름의 대용변수로서의 의미를 가지는 자본흐름의 측정변수로는 거래대금을 이용하였으며, 내국인과 외국인의 거래대금을 구분하여 두 투자자 집단의 거래에 내포되어 시장에 유입되는 정보흐름 효과의 차이를 분석하였다. 주요 실증분석 결과는 다음과 같다. 첫째, 총자본흐름의 당일 변수 또는 전일변수를 두 금융시장의 GARCH 모형에 포함시킬 때 GARCH 효과가 사라지지 않았다. 따라서 총자본흐름은 변동성에 대한 설명력이 없는 것으로 보인다. 둘째, 총자본흐름을 기대 및 비기대 자본흐름으로 구분하였을 때 내・외국인 비기대 자본흐름은 주식시장 변동성을 증대시키는 것으로 나타났다. 그렇지만 외국인의 예측 가능한 주식투자활동은 변동성을 감소시키는 영향을 미쳤다. 셋째, 내국인의 예측 가능한 채권투자활동은 변동성을 감소시켰고 예측 불가능한 채권투자활동은 변동성을 증가시키는 것으로 나타났다. 그렇지만 외국인의 기대 및 비기대 채권투자활동은 변동성에 영향을 주지 않는 것으로 나타났다.

Comparison of Two Nondestructive Methods of Leaf Area Estimation

우효진,박용목 한국생태학회 2009 Journal of Ecology and Environment Vol.32 No.1

We compared two nondestructive methods for leaf area estimation using leaves of 16 common plant species classified into six types depending on leaf shape. Relatively good linear relationships between actual leaf area (LA) and leaf length (L), width (W), or the product of length and width (LW) were found for ordinary leaves with lanceolate, oblanceolate, linear and sagitttate shapes with entire margins, serrate margins, mixed margins with a entire form and shallow lobes, and ordinary incised margins. LA was better correlated with LW than L or W, with R2 > 0.91. However, for deeply incised lobes, LA estimation using LW showed low correlation coefficient values, indicating low accuracy. On the other hand, a method using photographic paper showed a good correlation between estimates of area based on the mass of a cut-out leaf image on a photographic sheet (PW) and actual leaf area for all types of leaf shape. Thus, the PW method for LA estimation can be applied to all shapes of leaf with high accuracy. The PW method takes a little more time and has a higher cost than leaf estimation methods using LW based on leaf dimensions. These results indicate that researchers should choose their nondestructive LA estimation method according to their research goals. We compared two nondestructive methods for leaf area estimation using leaves of 16 common plant species classified into six types depending on leaf shape. Relatively good linear relationships between actual leaf area (LA) and leaf length (L), width (W), or the product of length and width (LW) were found for ordinary leaves with lanceolate, oblanceolate, linear and sagitttate shapes with entire margins, serrate margins, mixed margins with a entire form and shallow lobes, and ordinary incised margins. LA was better correlated with LW than L or W, with R2 > 0.91. However, for deeply incised lobes, LA estimation using LW showed low correlation coefficient values, indicating low accuracy. On the other hand, a method using photographic paper showed a good correlation between estimates of area based on the mass of a cut-out leaf image on a photographic sheet (PW) and actual leaf area for all types of leaf shape. Thus, the PW method for LA estimation can be applied to all shapes of leaf with high accuracy. The PW method takes a little more time and has a higher cost than leaf estimation methods using LW based on leaf dimensions. These results indicate that researchers should choose their nondestructive LA estimation method according to their research goals.

The Effect of Birds in the Families Ardeidae and Corvidae on Stand Structure in Bamboo Groves

서명원,우효진,이길성,추연식,이기섭,최기룡,박용목 한국생태학회 2008 Journal of Ecology and Environment Vol.31 No.4

We investigated death rates, growth rates and recruitment of culms in two neighboring bamboo (Phyllostachys bamboosoides) stands nested in by two different bird species to analyze stand structure and to design conservation strategies. A third bamboo grove not used by birds, the Taewha stand, was included as a control stand. The bamboo stand occupied by birds in the family Ardeidae (the Ardeidae stand) had an approximately 1.5 times higher culm density than the stand occupied by birds in the family Corvidae (the Corvidae stand). The crude death rate and the number of newly emerged shoots were also higher in the Ardeidae stand than the Corvidae stand. The death rate for bamboo in the Ardeidae stand was not dependent on diameter at breast height (DBH) and was almost 40% for culms of all sizes, whereas most dead culms in the Corvidae stand were < 4 cm DBH. Consequently, we conclude that in the Ardeidae stand, density-independent causes of death are operating, while density-dependent factor are more important in the Corvidae site. The results of soil analysis in these stands suggest that the density-independent death pattern observed in the Ardeidae stand may be due to soil acidification resulting from wastes produced by the birds during breeding. On the other hand, the culm distribution and death patterns in the Corvidae stand suggest that the stand characteristics were not affected by the nesting birds. These results suggest that different conservation strategies must be applied to conserve bamboo groves used by ardeids and corvids for nesting. We investigated death rates, growth rates and recruitment of culms in two neighboring bamboo (Phyllostachys bamboosoides) stands nested in by two different bird species to analyze stand structure and to design conservation strategies. A third bamboo grove not used by birds, the Taewha stand, was included as a control stand. The bamboo stand occupied by birds in the family Ardeidae (the Ardeidae stand) had an approximately 1.5 times higher culm density than the stand occupied by birds in the family Corvidae (the Corvidae stand). The crude death rate and the number of newly emerged shoots were also higher in the Ardeidae stand than the Corvidae stand. The death rate for bamboo in the Ardeidae stand was not dependent on diameter at breast height (DBH) and was almost 40% for culms of all sizes, whereas most dead culms in the Corvidae stand were < 4 cm DBH. Consequently, we conclude that in the Ardeidae stand, density-independent causes of death are operating, while density-dependent factor are more important in the Corvidae site. The results of soil analysis in these stands suggest that the density-independent death pattern observed in the Ardeidae stand may be due to soil acidification resulting from wastes produced by the birds during breeding. On the other hand, the culm distribution and death patterns in the Corvidae stand suggest that the stand characteristics were not affected by the nesting birds. These results suggest that different conservation strategies must be applied to conserve bamboo groves used by ardeids and corvids for nesting.

곰솔의 잎눈을 이용한 무성번식에 관한 연구

권오웅,우효진,송종헌,이정호 한국임학회 2009 한국임학회 학술발표논문집 Vol.2009 No.-

곰솔(Pinus thunbergii) 자생지의 생태 및 식생에 관한

이정호,권오웅,우효진,조민정,김무열 한국임학회 2012 산림과학 공동학술대회 논문집 Vol.2012 No.-

숙지의 샘장조절제 처리 및 녹지의 삽목시기가 한국 자생 조팝나무류의 발근에 미치는 영향

이정호,송천영,우효진,권오웅 한국화훼산업육성협회 2011 화훼연구 Vol.19 No.2

숙지삽 생장조절제 처리 및 녹지삽의 삽목시기가 조팝나무의 발근에 미치는 영향

이정호,권오웅,우효진,유성렬,송천영 한국임학회 2011 산림과학 공동학술대회 논문집 Vol.2011 No.-