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구준모(Junemo Koo),홍희기(Hiki Hong),서형식(Hyungsuk So) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
The effects of the temperature difference between the average room- and phase change (PCM) meterial phase changing temperatures, and the duration of its phase change on the stored energy and the temperature profile time shift are investigated. The optimal thickness of PCM board is presented based on the simulation results.
스프레이를 이용한 반도체 공정 감광액 코팅막 형성 전산모사
구준모(Junemo Koo),이진성(Jinsung Lee),정창훈(Changhoon Jung) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Spin coating has been mainly used to produce photoresist coated layers on wafers in semiconductor fabrication process due to its simplicity of operation, and uniformity and thinness of coated layers. To improve productivity, the wafer size has increased to 300 ㎜ recently, and it keeps increasing. The spray coating system, which uses a spray nozzle transversing over a wafer dispensing the photoresist solution, was developed to tackle the coating defect problem and limit of the current spin coating system in handling the 450 ㎜ wafers, which will come in use from the year of 2010. A new simulation model to predict the mean thickness and the uniformity of the photoresist film coated by the spray coating system was developed and validated with experimental data. The new model takes advantage of the simplicity of one-dimensional model while it can estimate the uniformity of the final film thickness. The new model well captures the effects of various operation parameters including the wafer spinning speed, the amount of photoresist solution applied, the initial viscosity of the solution, and dispensing phase duration. The new model will help understand the photoresist coating process and design new coating systems.
구준모(Junemo Koo),강용태(Yongtae Kang) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Nanofluids have been studied as possible alternatives for heat transfer fluids to improve the efficiency of heat exchangers. There are deviations of measured effective thermal conductivities between research-groups, and the mechanisms of the effective thermal conductivity enhancement of nanofluids are not confirmed yet. In this study, the effects of particle shape on the effective thermal conductivity enhancement are discussed and presented as a possible explanation of the deviations. The particle motion effect is found to be negligible for nanofluids of high aspect ratio cylindrical particles, which is believed to be important for nanofluids of spherical particles, while the percolation network formation and contact resistance play dominant roles in determining the effective thermal conductivity.
구준모(Junemo Koo),배충식(Choongsik Bae) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_1
Reverse flow, where the flowrate is measured, should be avoided to measure the incoming air flowrate to cylinder with a flowmeter which cannot distinguish the direction of the flow. Furthermore, the intake flow in single-cylinder engine test is needed to simulate the realistic flow in the multi-cylinder engines. In this paper, the minimum volume of surge tank to be installed in front of intake manifold for the experiments of single cylinder, is obtained. And, the different origins of reverse flow, are identified for single- and multi-cylinder engine. In the case of single cylinder engine, the volume of surge tank played the dominant role to prohibit reverse flow. Under the condition of 1000 RPM full load, about 500-1000 times the volume of displacement volume of a cylinder is required to settle it down. For multi-cylinder engine, as the engine speed decreases and the load increases, the reversing flow is apt to occur, and the frequency of intake stroke of cylinders was the major factor which determines the occurance of reversing flow
구준모(Junemo Koo),정정열(Jungyeul Jung),강용태(Yongtae Kang) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
A new one-dimensional simulation model to predict the surface coverage and average thickness of coating films obtained from spin coating processes is developed adopting moving mesh technique. The effects of initial profile, d ispensed volume, solvent vapor pressure, relative humidity and initial v iscosity on the coating film geometry are investigated numerically. The initially dispensed volume, solvent vapor pressure, initial viscosity and wafer rotation speed are found to be effective parameters to control the surface coverage and average film thickness. The relations between spin coating process parameters and the film geometry parameters, surface coverage and average film thickness, are derived from the new model. It is found that the photoresist solution consumption per a given size of chips could be reduced by optimizing the operation parameters.
유통환경 내에서 우유 내의 미생물 분포를 고려한 신선도 모니터링 시스템 개발
윤효정(Hyojung Yoon),구준모(Junemo Koo) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.11
In this work, the possible effects of the temperature distribution on the microbial growth in low temperature pasteurized milk were computationally investigated. Although the temperature difference between the food and the container surface was not measurable, there existed microbial distribution in milk during the exponential growth phase due to the impact of natural convection and diffusion.
HSDI 디젤 엔진에서 EGR 및 VGT의 상호 제어에 의한 NOx 및 이산화탄소의 배출 특성
조규희(Kyuhee Jo),구준모(Junemo Koo),박경석(Kyoungsuk Park),심범주(Beomjoo Shim),김인태(Intae Kim) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Compared with gasoline engine, diesel engine has big merit on thermal efficiency because it operates under higher compression ratio and air excess ratio. Further, it doesn"t need throttle valve which causes pumping loss. Also combustion control limitation for knocking is very small. Based on these, diesel engine is now being recognized to be one of solution to reduce tail pipe carbon dioxide (CO₂). But nitrogen oxides (NOx) emission is very high compared with gasoline engine because of lean burn combustion condition and NOx can not be treated by conventional aftertreatment such as oxidation catalyst because of high oxygen concentration in exhaust gas. This study was carried out to characterize NOx formation under interaction of exhaust gas recirculation(EGR) and variable geometry turbine(VGT). NOx concentration was observed under various exhaust back pressure, intake manifold pressure, EGR rate, recirculated exhaust gas mass by VGT vane and EGR vlave position control.
김정원(Jung-Won Kim),구준모(Junemo Koo),이용표(Young-Pyo Lee),황호순(Ho-Soon Hwang) 대한설비공학회 2012 대한설비공학회 학술발표대회논문집 Vol.2012 No.11
Lead acid battery is one of the most commonly used batteries at present, which is also used for electric vehicles called HEV. Electrode is 40%~50% of Lead acid battery"s weight. In this study, the optimization of the electrode geometry was investigated computationally by using the statistical method design of experiment to decrease the temperature rise, voltage drop as well as the non-uniformly in electric current density distribution to reduce the material waste in manufacturing batteries.
재실자 활동도를 고려한 학교 교실 미세먼지 농도 예측 모델 작성
박소우(Sowoo Park),구준모(Junemo Koo),송두삼(Doo Sam Song) 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2021 No.6
School classrooms are places where students, who are health-sensitive, spend a lot of time in a day, so particulate matter (PM) in classrooms has a significant influence on students health. The PM concentration in school classrooms can be formed from both the penetration from the outside air and the generation/resuspension of the indoor students activities. Previous studies conducted a macroscopic analysis of the indoor PM concentration based on occupancy status, however, the indoor PM penetration and generation characteristics may change every minute depending on the students activity and ventilation status. The aims of this study is to predict the PM concentration in the classroom by quantifying the penetration from the outside air and the generation from indoor activities according to the school occupancy schedule. Long-term measurements for PM concentration were conducted for about four months in 5 classrooms. The results showed that the inflow of external PM tends to decrease as the particle diameter increases when the door/window is closed. However, when students move through the door, the inflow of external PM with large particle size increased. Besides, the indoor PM generation rate increases as the particle diameter increases and particles with a diameter of 3 μm or more were generated by the student activities. Lastly, on days when the outside PM concentration was high, the indoor PM concentration was also high due to not only the infiltration effect, but also students entering and exiting.