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허재선,심후진,전해숙 順天大學校 1999 論文集 Vol.18 No.1
Monthly survey on water quality of the branch streams of Sunchon Bay was carried out for the last 1 year (1998 to 1999) as a part of long term projects to conserve Sunchon Bay - a very important wetland supporting a well developed framework of biodiversity including several bird species threatened with extinction. Three points of Dongchon, main stram of Sunchon Bay, and five points of the branch streams - Seochon, Hyanglimchon, Okchon and Isachon were selected for the survey. The results of the water quality measurement are the followings; 1) According to the standard of river water quality amended by Korean ministry of Environment, the water quality of the branch streams of Sunchon Bay corresponded to the Second Level which is suitable for river water. 2) Monthly changes of the water quality were not variable, except that of September, 1998 during the survey. 3) Total nitrogen and phosphorus contents responsible for eutrophication were relatively lower than those measured in several rivers in Korea. However, careful regulation of nitrogen and phosphorus contents at the upper parts of Dongchon stream seems to be needed. 4) Isacnon, the largest branch stream of Sunchon Bay, was found to be less polluted and played a very important role in improving water quality by a dilution effect before the polluted and played a very important role in improving water quality by a dilution effect before the polluted water of Dongchon stream reaches Sunchon Bay. It was more likely that the water quality of Sunchon Bay was dependant on area source of pollutants emitted by agriculture and livestock farming rather than industrial effluents or residential wastewater.
상수원수의 효과적인 정수처리를 위한 최적 응집제 주입량 결정 : Ⅲ. The Effect of Coagulant Aid Dose Ⅲ. 응집보조제 주입효과
손보균,허재선,조주식 順天大學校 1999 論文集 Vol.18 No.1
This study was conducted to determine the optimum amounts of coagulant for effective treatment of raw water. To avoid overdosing coagulants in case of low turbidity of raw water, the removal rate of turbidity and particle size distribution of flocs were investigated after addition of coagulant aids such as lime and coagulated sludges. When lime was used as a coagulant aid, the maximum removal rate of turbidity was found to be 93% by addition of 20ml/ℓ of lime in combination with 35mg/l polyaluminum chloride(PAC) as a coagulant. At the settling time of 8 min, more than 82% of suspended solids showed the particle size of less than 10㎛ and -7.4mV of zeta potential. It was found that increase in lime addition enhanced the removal efficiency of turbidity, but had no effect on reduction in lime addition enhanced the removal efficiency of turbidity, but had no effect on reduction in coagulant dosage. When coagulated sludges was employed as the aid, the maximum removal rate of turbidity was found to be 82% by addition of 20mg/l of the sludges in combination with 25mg/l PAC as a coagulant. At the settling time of 8 min, about 80% of suspended solids showed the particle size of less than 10um and +3.8mV of zeta potential. Zeta potential decreased with increasing amounts of coagulated sludges and PAC. Addition of coagulated sludges increased the removal rate of turbidity in the water and, at the same time, reduced the amounts of coagulant added.
과학기술계산을 위한 전자계산기용 특수 Library 개발에 관한 연구
金相萬,姜承業,沈在洪,文東纘,徐光烈,洪勝弘,愼哲宰 광운대학교 1972 論文集 Vol.2 No.-
In this paper the subroutine library of digital computer techniques to the solution of electronic networks problem are discussed. The application of digital-computer techniques to the solution of the integrations relating the terminal variables for linear time invariant inductos and capaciters are analyzed, then on the techniques of numerical integrations trapezoidal method is used. The subroutine library for differential equations and determinations which are used in electronic networks analysis have been developed. Since these programs are the general form, anybody can utilize the programs for his own purpose.