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O2/N2 와 O2/CO2 분위기에서 석탄의 연소 및 질소산화물의 특성에 관한 연구
이병화(Byoung-hwa Lee),김성곤(Seong-gon Kim),이천성(Cheon-sung Lee),송주헌(Ju-hun Song),장영준(Young-june Chang),전충환(Chung-hwan Jeon) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.40
The characteristics of combustion and emissions from pulverized coals with O2/N2 and O2/CO2 environment at different O2 concentration (12, 21, 31%) were investigated in an drop tube furnace. Results showed that the char burning rate was faster as O2 concentration was higher and char burning rate with O2/CO2 was decreased those of O2/N2 due to the lower rate of oxygen diffusion into coal surface through the CO2 rich boundary layer. NO concentration increased with increasing O2 concentration, but declined at 31% O2 concentration. On the other hands, NO indexes decreased monotonically with increasing O2 concentration. This facts indicated that the reduction of NO was increased in higher O2 concentration due to formation of HCN. The NO concentration with O2/CO2 was lower than those of O2/N2 entirely due to enhancement of the NO reduction reaction with carbon monoxide. Almost no effect of temperature on NO emission at 1300℃.
이병화(Byoung-hwa Lee),김경아(Kyung-ah Kim) 아시아민족조형학회 2011 아시아민족조형학보 Vol.10 No.1
The purpose of this study is to upgrade competitive brand-hanbok by analysis of the show-window image related brand-hanbok shop maintaining the distinguished market-image This research method is to taking a photograph of show-windows of brand-hanbok shop in Cheongdam and Apgujeong area. 21 of 80 phtographs were used as final analysis and The research was carried out from October 15 to 25 in 2010. As a result, the show-window was classed as a closed type, a half-open type, a open type and the presentation image was classed as a hanbok primarily image, a hanbok style image, a hanbok and obje-mix image. Presentation products were adult male and female hanboks and many of them were jegori presentation. Craft items were presented as a haam-box, a hoit-dae, a han-gi, a changmoonsal, a yonhwado, a platform, a orchid-pot, etc with traditional image In conclusion, this study suggests the marketing strategy used obje maintaining the image of brandhanbok-shop by the presentation of deginer"s personality and originality.
이병서(Byoung Seo Lee),이준식(Joon Sik Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Computational fluid dynamics simulations are conducted to investigate flow characteristics of a peristaltic micropump. The predicted relation between the pressure head and the flow rate agrees well with experiments. The flow behavior at every space and time, in various viewpoints, seems to be approximated as that in laminar channel flows. The velocity profiles either in the chamber or the channel are much similar to those of the Poiseuille flow. The pressure drops show a proportional relation with the flow rate, which is coincident with the equation derived from laminar flat-channel flows.
이병화(Lee Byoung-Hwa),이주원(Lee Choo-Won) 한복문화학회 2016 韓服文化 Vol.19 No.4
The purpose of this study is to make cultural life of future generation from ceremonial hanbok culture, through elementary school education, in relation to the campaign named “The vanishing culture of hanbok” This program was developed, forming a sort of play, by extracting core contents of the ceremonial clothes in previous research and making stories, which consist of many steps from the cradle to the grave based on clothes such as birth-dress, first birthday dress, custom dress, wedding dress, 60th birthday dress, funeral dress, ritual dress and added childhood clothes because childhood is the period of most frequently wearing hanbok presently. The subjects of this study are elementary school 3~4th grade students and this life-ceremonial program was carried out integrally and abbreviately in the whole frame due to a time limit only one school period. Each participant carried on a game mission in a group and the group experienced the rule of courtesy in relation to the ceremony. After this experience, reaction test report of all participants and teaching plan were suggested. The expected effect of this program is to alleviate refusal of wearing hanbok by this childhood experience and improve the dignity of ceremony through succeeding hanbok culture by encouraging each person to wear hanbok at home ceremony and transmit the life-ceremonies as a life culture through the generations by education of the next generation.
국내 수입탄 촤의 산화반응률 측정을 위한 해석기법 비교
이병화(Byoung-hwa Lee),송주헌(Ju-hun Song),강기태(Ki-tae Kang),장영준(Young-june Chang),전충환(Chung-hwan Jeon) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.11
Char oxidation experiments were performed with a sub-bituminous roto-middle coal in the Drop Tube Furnace (DTF) at atmospheric pressure condition. While temperatures varied between 900, 1100, 1400 ℃, particle size, mass, particle temperature, and CO/CO₂ concentration were obtained to be used for kinetic analysis of the char oxidation. This study addresses several different methods to analyze the char consumption rate, which are classified as energy balance method, ash-traced mass method, flue-gas based method, and particle size based method. The char consumption rate obtained with such methods was compared with the results of Monson et al.<SUP>(24)</SUP> While there are some differences between them because of differences in experimental apparatus and parameters to be measured, the kinetic results seems to be reasonable enough to be incorporated in a numerical modeling of coal combustion.