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강경수,최영찬,하진환,송대진 濟州大學校 工科大學 産業技術硏究所 1991 産業技術硏究報告 Vol.2 No.-
For the increase of treatment efficiency when waste water which included residual chlorine was biologically treated with activated sludge, elimination efficiency of COD and change of transmittance by activated sludge method were examined after the treatment of residual chlorine with ozone of 100 volt and l0ℓ-air/min., 0.8g-0_(3)/hr. in velocity. The results were as follows. 1) When the sample which included residual chlorine was treated with ozone of 0.8g-O_(3)/hr., COD removal rate by the change of pH and ozonization time was more efficient than acidity solution of pH 3.2(20%) and alkaline solution of pH 12.0(10%). Since the COD removal rate become 35% after 50 minutes of ozonization time at neutral solution of pH 7.2. 2) After the residual chlorine included sample was treated with ozone for 50 minutes to make the F/M rate of 0.1㎏·BOD/㎏·MLSS, the sample was reacted with activated sludge for 3, 6, 9 and 15 hours. The 6 hours reaction gave 85.8% COD elimination which showed higher efficiency than 60.5% by Na_(2)S_(2)O_(3) treatment togather with shorting efficiency of reaction time. 3) When such sample as polyphenol which gives dark brown color was treated with ozone for 50 minutes after being made into acidic, neutral and alkaline solution. the transmittance increased from 30- 40% to 70% and gave better result in alkaline solution.
강경수,이종호,우호길 충남대학교 공업교육연구소 2002 論文集 Vol.25 No.1
In this study, a shape optimization for a frame of a vehicle windshield wiper system is presented. This study investigated how to optimize a shape and minimize mass(volume) and the number of parts with sufficient strength of a frame instead of a conventional structure. The dffectiveness of this analysis procedure is expected to reduce development lead time &cost actually.
강경수 대한양계협회 2001 월간 양계 Vol.33 No.8
1992년 8월 국내 최초로 갈색 산란계에서 발생한 가금티푸스는 1994년 폭염으로 인해 전국적인 발생을 보여많은 양계농장에 고통을 안겨왔으며, 현재까지도 지속적인 발생을 하고 있는 실정이다. 작금의 국내 양계산업은 갈수록 태산이라는 말이 적절할 정도로 새로운 질병이 발생되어 있으며, 또한 과거에 발생하였던 질병도 끊임없이 발생하고 반복되고 있다. 뉴켓슬병(ND), 전염성F낭병(IBD),가금티푸스(SG), 가금인플루엔자(AI),전염성기관지염(IB), ORT등이 현재 우리나라 양계장에 만연되어 있는 질병이다. 혹서기에 접어들면서 예외없이 많은 농장이 가금티푸스가 발병되고 있는 바 필자는 가금티푸스의 예방과 대책에 대하여 양축가의 이해를 돕고자 한다.