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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.
Comparative study on the performance of pod type waterjet by experiment and computation
김문찬,박원규,전호환,정운화 대한조선학회 2010 International Journal of Naval Architecture and Oc Vol.2 No.1
A comparative study between a computation and an experiment has been conducted to predict the performance of a Pod type waterjet for an amphibious wheeled vehicle. The Pod type waterjet has been chosen on the basis of the required specific speed of more than 2500. As the Pod type waterjet is an extreme type of axial flow type waterjet, theoretical as well as experimental works about Pod type waterjets are very rare. The main purpose of the present study is to validate and compare to the experimental results of the Pod type waterjet with the developed CFD in-house code based on the RANS equations. The developed code has been validated by comparing with the experimental results of the well-known turbine problem. The validation also extended to the flush type waterjet where the pressures along the duct surface and also velocities at nozzle area have been compared with experimental results. The Pod type waterjet has been designed and the performance of the designed waterjet system including duct, impeller and stator was analyzed by the previously mentioned in-house CFD Code. The pressure distributions and limiting streamlines on the blade surfaces were computed to confirm the performance of the designed waterjets. In addition, the torque and momentum were computed to find the entire efficiency and these were compared with the model test results. Measurements were taken of the flow rate at the nozzle exit, static pressure at the various sections along the duct and also the nozzle, revolution of the impeller, torque, thrust and towing forces at various advance speeds for the prediction of performance as well as for comparison with the computations. Based on these measurements, the performance was analyzed according to the ITTC96 standard analysis method. The full-scale effective and the delivered power of the wheeled vehicle were estimated for the prediction of the service speed. This paper emphasizes the confirmation of the ITTC96 analysis method and the developed analysis code for the design and analysis of the Pod type waterjet system.
DOP(Dioctylphthalate) 산화촉매의 특성연구
김문찬 청주대학교 산업과학연구소 2006 産業科學硏究 Vol.24 No.1
DOP (Dioctylphthalate) was well spreader on our home recently. But DOP is a kind of VOC_(s) (Volatile organic compounds) and toxic and dangerous material for health. In this study, oxidation catalysts were prepared for DOP oxidation and characterized. The metallic site of platinum was well dispersed when we use iridium as a promoter. Oxidation capability of DOP was high on PtPdlrCo/tiO₂ at low temperature. The oxidation capability at low temperature of P_(t)PdIrCo/TiO_(2) catalyst was due to new active site by metal complex between Wt and Ir.
PtPd/γ-Al2O3 촉매상에서 CNG(Compressed Natural Gas)의 산화반응에 대한 연구
김문찬 청주대학교 2015 産業科學硏究 Vol.33 No.1
CNG(Compressed natural gas) oxidation reaction was performed over PtPd/γ-Al2O3 catalyst. THC(Total hydrocarbon) concentration and conversion was detected in order to study the reduction of methane and formaldehyde from the CNG gas by using catalyst. LOT(Light off temperature) is very important for the performance of low temperature oxidation of catalyst. LOT of 1Pt3Pd/γ-Al2O3 catalyst was 365℃. It is very low temperature compared to commercial catalyst which LOT is over 400℃ normally. THC conversion was 92 % at 400℃ over 1Pt3Pd/γ-Al2O3 catalyst. It showed that 1Pt3Pd/γ-Al2O3 catalyst is competitive and effective for the performance of low temperature oxidation of CNG engine emission.