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동제련슬래그를 혼입한 고강도 콘크리트 특성에 관한 기초적 연구
정상진 단국대학교 2001 산업기술연구 Vol.2 No.-
The environment preservation is not a matter of concern and interest for a long time. It was caused by too far economic growth oriented social consciousness in the domestic. In modern times, the environment preservation is global tendency and self social awareness is arise. Measures to the environment preservation and pollution is going on study. One measure is recycling and reuse of by product and it is already developed in some advanced country. But, the study about by product reuse is just beginning in domestic. In construction business, the one kinds of method that recycle by product and solve natural resource exhaustion is using fly ash, granulated furnace slag as admixture and aggregate. It is high functional and quality concrete manufacturing with use of this method. The purpose of this study is reusing copper slag -by product which produced L cooperaton in domestic-as fine aggregate for producing high strength concrete and investigating the fundamental characteristics. In the experiment, characteristics like fluidity and strength development are investigated and analyzed. It is acquired that conclusions on high strength copper slag concrete from the result of this study. (1) The result of fluidity test like slump and slump flow, Slump result in 18㎝ on all experimental mixing. It could bring fluidity improvement of concrete using copper slag. Slump flow result in more than 60㎝ and give good packing ability. (2) In the bleeding content test, More 154% bleeding content is occurred as overplus water. It is caused by low water absorption of copper slag and could bring drying shrinkage. To hinder shrinkage, it needs using of admixtures like high water reduction agent. (3) Using copper slag in concrete gives air content lowering as 1∼2%. (4) In case of W/C 30%, slag replacement rate 25%, the maximum strength 594 ㎏f/㎠ is developed. Using more than 50% slag replacement rate caused segregation, void occurrence. (5) The concrete unit volume weight is 5∼14% going up to general concrete while the slag replacement rate is increased. Copper slag concrete weight considered for building structure design.
Alternaria sp.의 균체생성을 위한 최적 배양조건
정상진 청주대학교 산업과학연구소 2005 産業科學硏究 Vol.23 No.1
The optimal culture conditions for biomass production of Alternaria species was investigated. The optimal pH was 4, the culture produced best biomass in 8 days at 25 ℃. The carbon source was dextrin for the best effective biomass production and the optimal concentration of dextrin was 7 %. Best nitrogen source was peptone and optimal the concentration was 0.5 %. The effective ratio of carbon source and nitrogen source was 4 : 1 for the best biomass production.
정상진 한국냄새환경학회 2012 실내환경 및 냄새 학회지 Vol.11 No.4
The dispersion of air pollution in complex situations such as the cases of the filled road is a significant problem for the public safety and living quality. Application of computational fluid dynamics (CFD) helps to build the model calculation in order to estimate the dispersion of air pollutants. In order to assess its accuracy, this study used the Realizable k-ε model, the RNG k-ε model, and the Shear-Stress Transport k-ω turbulence model in FLUENT CFD code. The results were compared with the wind tunnel experiments. The Realizable k-ε turbulence model provided the best prediction for the surface concentration and concentration profiles of selected downwind positions of the filled road. It was found that a noise barrier, which positioned on the filled road, increases the vertical air pollution impact distance larger 1.75~1.92 times and decrease the horizontal impact distance lower 0.46~0.54 times than those of no barrier case. It was also found that two or three noise barriers increase 1.63~1.79 times the vertical air pollution impact distance. It contributes the decrease of horizontal air pollution impact distance 0.49~0.63 times compare with no barrier case.