• 한국물환경학회지
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• 제20권6호
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• pp.703-707
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• 2004

In this study, a simple regression model is proposed in order to analyse the effect of population and urban land use on the water quality of Paldang lake, Gyeonggi. As a comparison result with Qua12E water quality model, the proposed model shows very good predicting performance in simulating several alternative scenarios. In order to accomplish BOD 1ppm of Paldang lake, various model applications show that the population incoming and urban land use management should be afoot in addition to stricter outflow water quality from sewer treatmement systems.

• 미생물학회지
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• 제19권2호
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• pp.45-51
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• 1981

The physico-chemical and biological factors of coastal sea water were measured bimonthly from 1976 to 1979 for elucidating the relationship between microbial distribution and environmental factors at Masan and Jinhae bay. The experimental results are summarized as followings : 1) The polulation size of bactriz in sea water were increasing as the water temperature increased, and that was higher at station 2 and 3 than at station 1. The number of fungi showed the highest value on July on bottom. The population size of yeast showed no seasonal variation and also showed a relation with the geographic distance. 2) The correlationship between microbial distribution and environmental factors showed little coefficiency in surface water. And the other hand, at bottom water, between general bacteria and water temperature and dissolved oxygen, and between yeast and salinity, there were relatively high coefficiecy.

• 미생물학회지
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• 제11권3호
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• pp.134-151
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• 1973

1976년 7월부터 1979년 11월까지 격월로 진해만 일대의 연안해수에 대한 미생물의 분포를 주사하생물의 그 분포와 환경요인과의 상관관계를 검토하였는데 그결과는 다음과 같다. 일반세균은 수온이 올라갈수록 그 수가 증가하고 있으며 정점 1보다는 정점 2와3에서 더 많은 수가 분포하며 균류는 표층에서는 경향성이 없이 분포하나 층에서는 저층에서는 7월에 가장 높은 값을 보여주고 효모는 3월에 증가하나 계절적으로 큰 변화를 보여주고 있지 않다. 미생물과 환경요인과의 상관관계는 표층에서는 유의한 상관관계를 보이지 않으며 저층에서는 수온과 일반세균과는 매우 큰 상관관계를 보였으며, 용존산소와 일반세균, 효모와 분도 비교적 상관관계가 높은 것으로 나타났다.

• 대한교통학회지
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• 제22권3호
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• pp.27-39
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• 2004

현재 도시의 교통안전 정책의 시행효과를 분석하는 연구가 매우 미흡한 실정이다. 도시의 교통특성에 맞는 교통안전정책 시행은 도시의 교통사고 감소에 기여할 수 있을 것으로 판단된다. 본 연구에서는 전국 시급 81개 도시를 대상으로 인구 규모별로 네 개의 그룹으로 구분하여 교통사고와 교통안전정책간 연관성을 여러 통계기법을 적용하여 분석하였다. 교통사고자료(9개 항목), 교통안전정책(9개 항목)에 대한 통계분석도 각각 시행하였고, 교통사고자료와 교통안전 정책간 회귀분석 모형을 설정하여 어느 정책이 효과가 있었는지 분석하였다. 분석결과, 도시의 교통사고를 감소시키는 교통안전 정책이 도시별로 각각 다르게 나타났다. 분석결과에 따라서 도시별 교통안전정책의 추진 방향이 본 연구를 통해 새로이 제시되었다. 도시의 규모가 큰 도시는 교통안전시설에 대한 예산투자 정책이 상대적으로 교통사고 감소에 영향을 크게 미치는 것으로 나타났으며, 중소도시에서는 교통단속정책과 교통안전교육이 사고를 줄이는데 상대적으로 효과가 있는 것으로 분석되었다.

• 미생물학회지
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• 제19권2호
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• pp.63-77
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• 1981

The growth rate of yeast population (Saccharomyces uvarum) cultivated in the Knopp's modified medium (plus various carbon sources) appeared the highest value when the Knopp's minimal medium was treated to 1.5% with disaccharide such as maltose and sucrose. Also the treatment of lactose and raffinose resulted in polulation growth as to the population size in case of maltose and sucrose. However, the gorwth of yeast was not occurred at all when a polysaccharide, such as inulin, was added as carbon source. The growth from of yeast population in Knopp's modified medium are characterized by the fact that log phase continued 100hrs after inoculation and that stationary state phase appeared in general 250hrs after inoculation. Applying the various carbon sources to respiration substrate for yeast cell, the respiration rate of yeast showed the highest value in treatment of maltose and followed in order of raffinose, lactose, glucose, and sucrose. Determined the amount of poly-phosphate and turn over pathway of poly-phosphate according to culture phase of yeast, it is revealed that the yeast synthesized 3 types of poly phosphate (poly-P A,B, and C) and postulated that turn over pathway of poly-phosphate as follows ; Inorganic phosphate is converted into each kind of polyphosphates, and then one part of poly-P-C is converted into poly-P-B, the rest poly-p-C and poly-P-B are converted into poly-P-A. The synthesized poly-phosphate is considered to have a role as energy pool utilizing to synthesis of cellular organic materials. Of the 13 carbon sources used in this experiment, the useful carbon sources for biosynthesis of poly-phosphate and cellular organic materials are confirmed as disaccharide (maltose and sucrose) as well as glucose. Protein synthesis in yeast cell showed the two peaks on 6th and 8th day after inoculation ; nucleic acid on 2nd day (48hrs), carbohydrates on 2nd day (48hrs), and phospholipid on 2nd and 8th day after inoculation, respectively.