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류승곤(Seung Kon Ryu),이보성(Bo Sung Rhee) 대한공업교육학회 1984 대한공업교육학회지 Vol.9 No.1
Water contamination of large three streams in DAE JEON was measured during the summer time in 1983. The data were compared to those of the last some years and the results were summerized as follows; 1. The pH value was very low (av:5.8) and the water temperature was so high in DAE WHA DONG (av:27.8 ℃), where a lot of factories were located together. It means that some factories were pouring hot acid wastewater without careful treatments. 2. The amount of dissolved oxygen of all streams were so little (av:1.0ppm) that most of underwater living things can not live there. 3. The average value of BOD is amount to 115-230 ppm, and all the streams were overloaded to self-clearing. 4. Low COD values comparing to those of BOD seem that most streams must have contaminated with aromatic compounds or pyridine, which are usually decreasing the COD value. 5. Insufficient treatment of excrements in the large scale apartment district have caused for increasing the amount of suspended solids.
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Attrition Reactor에서의 힘의 소모량 측정에 관한 연구
劉承坤 충남대학교 공업교육연구소 1982 論文集 Vol.5 No.1
The milling effect of Attrition reactor was very successful using stainless steel balls as a milling media. But Attrition reactor need large amount of power consumption to agitat the heavy milling media. Power measurements were studied with a dynamometer which was attached to the torque table. Power consumptions were measured by changing agitation speeds, kinds of milling media, heights of milling media, positions of stirrer, stirrer types, and so on.
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柳洲鉉,卞裕亮,劉承坤 연세대학교 산업기술연구소 1978 논문집 Vol.8 No.1
The amount of ethanol extract from ginseng was about 20.3% (w/w)and the yield of saponins from the extract was 5.5% (w/w). The optimum concentration of solvent was 60% ethanol. The optimum extraction time and temperature were respectively 2 hr and 80℃ when 0.5g of sample (Φ:0.25∼0.42mm) was added to 300ml of solvent. The empirical equation for the extraction of components was as follow: Y(θ,T,φ)=8log(Θ??100)-45log(T??×100)-60log(Φ??×100)+38 The partical size of sample had largely influence on the extraction yield, and the extraction mechanism was considered as diffusion.
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Pentadecafluorroctyl Polyacrylate에 依한 Nylon 6 纖維의 撥水加工에 關한 硏究
李廷玟,任洪彬,劉承坤,裵基瑞 충남대학교 공업교육연구소 1978 論文集 Vol.1 No.2
This study has been investigated on the effects of fluorochemical repellent agent on the water repellent finishes of nylon 6 fibre with pentadecafluorooctyl polyacrylate. Contact angles of various liquids on the fluorochemical treated nylon 6 surface are measured. The critical surface tension of about 46 dynes per cm on the nylon 6 surface is resulted. The effect of fluorochemical repellent was most favourable at 1% concentration repellent agent and the critical surface tension is resulted the value of about 10.5 dynes per cm. The use of antistatic agent in the fluorochemical repellent was most favourable below 0.5% concentration. It was found that the repellent effects were improved by repeated treatments with the solution of lower concentration of repellent.
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