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김문찬,김문찬 류효상 청주대학교 2009 産業科學硏究 Vol.27 No.1
In this study, air quality was investigated around the local/highway bus terminal area at Cheongju City by using ISC3 model. THC was selected as pollutants. The amount of exhaust emissions were calculated by the engine emissions of driving and idling, on the assumption that idling times were 5, 10, 20, 30 minutes, respectively. Air quality concentrations were simulated by the yearly mean values which were in the morning, in the afternoon and in the night. As the result of the verification and the calibration for the model accuracy, the correlation coefficients were above 0.77. Therefore, ISC3 model was suitable for this area. In the result of air quality using ISCLT3, the average concentration of THC during engine driving was 49.86 ppb. The average concentration of THC for 5 minutes engine idling was 52.13 ppb. Comparing with these results, the emissions from engine idling were more deteriorate air quality than that from engine driving. The range of influence that engine emissions affected terminal area at Cheongju City, was larger in the morning than in the afternoon. In the night, the range of engine emission influence was largest.
김문찬 청주대학교 산업과학연구소 1998 産業科學硏究 Vol.15 No.3
Antistatic property and crystalization behavior of antistatic polyster chip were studied by feeding antistatic agents into polycondrnsation reactor. Grass transition and melting temperature of antistatic polyester chip were decreased by polyoxyalkyleneglycol(POAG) component of antistatic agent. The crystalization rate of antistatic polyster chip was inhibited due to decreasing crystalization temperature of antistatic polyester chip. Thermal properties and crystalization behavior was affected by not alkulsulfonate metal deritives component of antistatic agent but POAG content of it. The main antistatic component of antistatic agent was polyoxyalkyleneglyco1. The main role of alkylsulfonate metal deritives was increasing melt viscosity of antistatic polyester polymer.
열안정제가 제전 폴리에스터 칩의 건조속도와 수분율에 미치는 영향
김문찬,이철규,남기창 청주대학교 산업과학연구소 1998 産業科學硏究 Vol.15 No.3
Drying rate and moisture content of antistatic polyester chip was studied by addition of thermal stabilizer. The terminal moisture content of antistatic polyester chip was a function of drying temperature rather than drying time. Intrinsic viscosity drop of antistatic polyester chip after melt spinning increased with increasing moisture content of it. After melt spinning intrinsic viscosity of antistatic polyester was reduced due to the thermal degradation of polyoxyalkyleneglycol(POAG) component of antistatic agent. It was more effective to using triphenyl phosphate(TPP) as a thermal stabilizer than to use trimethyl phosphate(TMP). A little intrinsic viscosity drop after melt spinning was found using triphenyl phosphate as a thermal stabilizer.
Ag/γ-Al<sub>2</sub>O<sub>3</sub> 촉매상에서 탄화수소-SCR(Selective Catalytic Reduction) 연구
김문찬,이철규,Kim, Moon-Chan,Lee, Cheal-Gyu 한국분석과학회 2005 분석과학 Vol.18 No.2
본 연구에서는 자동차의 배출가스중에 포함된 NO를 비선택적 촉매환원법으로 환원시켜 제거하기 위하여 Ag의 함량을 여러 가지로 달리하여 ${\gamma}-Al_2O_3$에 담지한 촉매를 제조하였고, 제조한 촉매에 대하여 온도, 산소농도, 아황산가스농도의 변화에 따른 $NO_x$의 전환율에 대하여 연구하였다. 또한 제조한 촉매의 물성분석을 통하여 촉매의 상태와 $NO_x$의 전환율과의 관계를 알아보았다. 제조한 각각의 촉매에 대하여 반응조건을 여러 가지로 달리하여 반응실험을 한 결과 $Ag/{\gamma}-Al_2O_3$ 촉매는 Ag의 함량이 2 wt%일 때, 그리고 반응온도가 약 $450^{\circ}C$일 때 가장 높은 $NO_x$ 전환율을 나타냈다. 반응실험 전 후의 촉매에 대하여 X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), Temperature Programmed Reduction (TPR), Ultraviolet-Visible Diffuse Reflectance Spectroscopy (UV-Vis DRS)등의 분석 결과와 반응실험 결과를 비교하여 볼 때 Ag의 산화상태가 잘 유지되지 못하여 고온에서는 $NO_x$ 전환율이 낮아지는 것으로 나타났다. Removal of NO contained in automobile exhaust gas was accomplished by the non-selective catalyst reduction method. The catalysts were prepared through loading of a specific amount of Ag into ${\gamma}-Al_2O_3$. The conversion of $NO_x$ was studied by varying the temperatures, $O_2$ concentrations and $SO_2$ concentrations for the prepared catalysts. The influence of the structure of catalyst to $NO_x$ conversion was followed through the analysis of the physical properties of the prepared catalysts. Experiments were conducted on each of the catalysts by varying the reaction conditions to find an optimum condition. The catalyst $Ag/{\gamma}-Al_2O_3$ shows a highest $NO_x$ conversion when the Ag content was 2 wt% and a reaction temperature of about $450^{\circ}C$. and after conducting the experiments, samples of before and after experiments analyzed using XRD, XPS, TPR, and UV-Vis DRS experiments. The result indicated that when Ag oxide content could not be maintained well at high temperatures $NO_x$ conversion decreased.
외전 감입에 의한 상완골 근위부 사분 골절의 보존적 치료 - 증례 보고 -
김문찬,조재림,정흥태,김동준,김인보 대한골절학회 2011 대한골절학회지 Vol.24 No.1
상완골 근위부 골절 중 특히, 외전 감입에 의한 사분 골절은 수술적 치료 후 조기 재활로 견관절의 운동범위를 회복시켜야 좋은 임상 결과를 얻을 수 있다. 하지만 저자들은 보존적인 치료를 시행하여 우수한 임상결과를 얻은 환자의 증례를 경험하였다. 이에 문헌 고찰과 함께 증례를 보고하는 바이다.
CoMo/제올라이트 촉매상에서 Dibenzothiophene의 수소첨가 탈황반응
김문찬 청주대학교 산업과학연구소 1997 産業科學硏究 Vol.15 No.2
Hydrodesulfurization of dibenzothiophene was studied over CoMo/zeolite catalyst compared to prepared commercially using NiMo/γ-Al_(2)O_(3). Hydrodesulfurization activity of CoMo/zeolite was higher than that of prepared NiMo/ γ-Al_(2)O_(3) at low temperature range, 200℃ and 225℃, and it was lower than that of prepared NiMo/γ-Al_(2)O_(3) over 275℃. Hydrodesulfurization performed in a high pressure fixed bed reactor. The man product over NiMo/γ-Al_(2)O_(3) were biphenyl and cyclohexylbenzene. The product distribution of CoMo/zeolite was different from that of NiMo/γ-Al_(2)O_(3). It considered that DBT converted to alkylcyclohexane through both of alkylation and hydrogenation path.