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층류 CH₄/Air 예혼합화염의 하류영역에서 NO 농도 예측을 위한 열손실 모델의 검토
황철홍(Cheol-Hong Hwang),이창언(Chang-Eon Lee),금성민(Sung-Min Kum),이기만(Kee-Man Lee),신명철(Myung-Chul Shin),김세원(Se-Won Kim) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.7
One-dimensional modeling of CH₄/air premixed flame was conducted to validate the heat loss model and investigate NOx formation characteristics in the postflame region. The predicted temperature and NO concentration were compared to experimental data and previous heat loss model results using a constant gradient of temperature (100 K/㎝). The following conclusions were drawn. In the heat loss model using steady-state heat transfer equation, the numerical results using the effective heat loss coefficient (heff) of 1.0 W/㎡K were in very good agreement with the experiments in terms of temperature and NO concentration. On the other hand, the calculated values using the constant gradient of temperature (100 K/㎝) were lower than that in the experiments. Although the effects of heat loss suppress NO production near the flame region, a significant difference in NO concentration was not found compared to that under adiabatic conditions. In the postflame region, however, there were considerable differences in NO emission index as well as the contribution of NO formation mechanisms. In particular, in the range of ø≥0.8 , the prompt NO mechanism plays an important role in the NO reduction under the adiabatic condition. On the other hand, the mechanism contributes to the NO production under the heat loss conditions.
전기철도 전자기환경과 공항 전자기환경의 상호 간섭에 대한 영향평가 연구
김민철(Kim Min-Cheol),이장무(Lee Jang-Mu),한문섭(Han Moon-Soeb),김주락(Kim Ju-rak),신명철(Shin Myung-cheol) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
The airport needs fast and reliable transporter to transfer goods from airport to other cities. In the past, a highway was a main transporter for those function of the airport but recently, electrical train becomes main part of transporter due to its high efficiency, convenience and advantage of auto-pilot. However electrical train produce electromagnetic field and many kinds of radio communication system are existing in the airport. So, some electromagnetic interference can be existed between the railway system installed nearby the airport and the radio-communication systems of the airport. Therefore, effects of electromagnetic interference between them need to be estimated by actual field test.
층류 CH<sub>4</sub>/Air 예혼합화염의 하류영역에서 NO 농도 예측을 위한 열손실 모델의 검토
황철홍,이창언,금성민,이기만,신명철,김세원,Hwang, Cheol-Hong,Lee, Chang-Eon,Kum, Sung-Min,Lee, Kee-Man,Shin, Myung-Chul,Kim, Se-Won 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.7
One-dimensional modeling of $CH_4$/air premixed flame was conducted to validate the heat loss model and investigate NOx formation characteristics in the postflame region. The predicted temperature and NO concentration were compared to experimental data and previous heat loss model results using a constant gradient of temperature (100 K/cm). The following conclusions were drawn. In the heat loss model using steady-state heat transfer equation, the numerical results using the effective heat loss coefficient ($h_{eff}$) of $1.0\;W/m^2K$ were in very good agreement with the experiments in terms of temperature and NO concentration. On the other hand, the calculated values using the constant gradient of temperature (100 K/cm) were lower than that in the experiments. Although the effects of heat loss suppress NO production near the flame region, a significant difference in NO concentration was not found compared to that under adiabatic conditions. In the postflame region, however, there were considerable differences in NO emission index as well as the contribution of NO formation mechanisms. In particular, in the range of ${\phi}\;{\geq}\;0.8$, the prompt NO mechanism plays an important role in the NO reduction under the adiabatic condition. On the other hand, the mechanism contributes to the NO production under the heat loss conditions.
시뮬레이션을 이용한 음악줄넘기 수업이 성장기 초등학생의 학생건강체력과 기능성운동수행능력에 미치는 영향
박정민(Jeong-Min Park),신명철(Myung-Cheol Shin),백형남(Hyeong-Nam Baek),박상균(Sang-Kyun Park) 한국교원대학교 뇌기반교육연구소 2019 Brain, Digital, & Learning Vol.9 No.4
This study was to investigate the effects of music jump rope training, in using the simulation on elementary school children s PAPS and functional exercise performance abilities in the elementary school children s. The participants were divided into two groups: music jump rope training in using the simulation Exercise group (n=44) and music jump rope training in using the simulation Non Exercise group (n=44). The music jump rope training in using the simulation for 12 weeks. The results of this study were as follows: First, there were significantly increased in muscle strength, muscle endurance, cardiovascular endurance, flexibility and agility in EG compared with NEG after 12 weeks. Second, there were significantly increased in Second, there were significantly increased in carioca, co-contraction, shuttle-run, cross over up step, one-leg hop test abilities. As conclusions, this study confirmed that the usic jump rope training in using the simulation exercise could improve the PAPS and functional exercise performance abilities of elementary school children s.
선회 예혼합 연소기의 연소실 직경 변화에 따른 NOx 생성 특성
김동춘(Dong-Chun Kim),이승로(Seungro Lee),황철홍(Cheol-Hong Hwang),신명철(Myung-Chul Shin),김세원(Se-Won Kim),이창언(Chang-Eon Lee) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.38
The swirl premixed burner comes to spotlight for reducing pollutant and high efficiency because the swirl flows of premixed burner generates the flow change by various parameter. Characteristics of NOx emission for premixed swirl burner was studied numerically with various furnace inner diameters like 0.84m, 0.96m and 1.15m based on experimental results. For the numerical simulation, the commercial software, Fluent 6.3, was used. As results, the recirculation zone in the combustor was increased as increased inner diameter. And then, the high temperature zone was decreased. Consequently, it decreased the amount of thermal NOx. These results will be useful to design the combustor.
홍현표(Hyun-pyo Hong),한문섭(Moon-seob Han),서명석(Myung-seok Seo),신명철(Myong-cheol-Shin),윤용한(Yong-han Yoon),김재철(Jae-chul Kim) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
The neutral section was installed in order to prevent conflict with different phase angle source in electric railway catenary system. The speed of electric train reduced due to coasting operation by notch off when it passed the neutral section. And, the catenary wire was damaged and the accident might be happened because of the arc generation when the electric train passed the neutral section with notch on condition. This project has a goal to develop the automatic changeover system using by noncontactless semiconductor device in neutral section of catenary system so that the train pass as notch-on condition. In this first year, we obtain as following results such as domestic and international systems applications and completion requirements, development and analysis of stability for automatic changeover system, design of static switching device on automatic changeover system in neutral section and drawing up interface design and specifications according to equipment.