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1-Hexyl-3-methylimidazolium Tetrafluoroborate으로 제조된 팔라듐 탄소촉매를 이용한 Hexafluoropropylene 수소화 반응
정지백 ( Ji Baek Jeong ),유계상 ( Kye Sang Yoo ) 한국공업화학회 2013 공업화학 Vol.24 No.4
Palladium on carbon powder was prepared using 1-hexyl-3-methylimidazolium tetrafluoroborate, one of room temperature ionic liquids. The synthesized particles were tested as a hexafluoropropylene hydrogenation catalyst. Moreover, the hydrogenation was performed under various reaction conditions to develop an optimum reaction process. The catalyst prepared by more than 3 wt% of palladium and the unity mole ratio of ionic liquid to palladium precursor showed higher catalytic activity. For reaction conditions, the complete hexafluoropropylene (HFP) conversion was achieved at these conditions; the volume flow ratio of hydrogen to HFP was higher than 1.25 and GHSVHFP was lower than 50000 mL/g-h.
알칼리 용융 및 수열 합성에 의한 석탄회로부터 제올라이트 A의 합성
정지백,최고열,Jeong, Ji-Baek,Choi, Ko-Yeol 한국응용과학기술학회 2015 한국응용과학기술학회지 Vol.32 No.2
석탄회를 NaOH로 용융시킨 후 수열 처리에 의하여 제올라이트 A를 합성하였다. NaOH/석탄회의 비, 용융 온도, $NaAlO_2$의 첨가량, 수열 처리 온도 및 시간이 생성된 제올라이트의 종류와 결정도에 미치는 영향에 대하여 연구하였다. 결정도가 높은 제올라이트의 생성에 필요한 최적의 NaOH/석탄회의 중량비는 1.2, 최적의 용융 온도는 $550^{\circ}C$이었다. 용융된 석탄회로부터 $Si^{4+}$ 와 $Al^{3+}$의 용출은 교반 시간의 영향을 받지 않았다. 생성된 제올라이트의 형태는 첨가한 $NaAlO_2$의 영향을 받는 것으로 나타났다. 적은 양의 $NaAlO_2$를 첨가하면 제올라이트 X가 생성되나 $NaAlO_2$의 양이 증가하면 단일상의 제올라이트 A가 생성되었다. 수열처리 시간과 온도가 증가하면 제올라이트 A는 hydroxysodalite로 변화 하였다. 승온 속도를 낮춰 반응 온도까지의 도달시간을 증가시키면 결정도가 좋은 제올라이트 A를 얻을 수 있었다. Zeolite A was prepared from coal fly ash upon NaOH fusion treatment, followed by hydrothermal treatment. The effects of treatment conditions such as NaOH/ash ratio, fusion temperature, the amount of sodium aluminate added, hydrothermal treatment temperature and time on the type and the crystallinity of zeolites were investigated. The optimal NaOH/ash weight ratio and fusion temperature to produce high crystalline zeolite A were 1.2 and $550^{\circ}C$, respectively. The dissolution of $Si^{4+}$ and $Al^{3+}$ from the fused fly ash was not affected by stirring time. The type of synthetic zeolites was found to be dependent on the amount of sodium aluminate added. The low amount of sodium aluminate favored zeolite X, while a single phase zeolite A was produced by increasing the amount sodium aluminate. Zeolite A was transformed into hydroxysodalite with increasing hydrothermal treatment time and temperature. A high crystalline zeolite A could be obtained by decreasing the temperature increasing time up to the reaction temperature.
군집분석을 이용한 온실가스 배출특성에 따른 도시유형화 : 국내 기초자치단체 73개 시를 중심으로
정지형(Jeong Ji Hyeong),반영운(Ban Yong Un),백종인(Baek Jong In),최나래(Choi Na Rae),김유미(Kim Yu Mi) 한국지역개발학회 2010 한국지역개발학회 학술대회 Vol.2010 No.11
Recently, local governments tend to calculate the amount of greenhouse gas(GHG) emissions, so that they set up reduction target to respond to climate change. This study has intended to calculated the account of local government's GHG emissions through 2006 IPCC guideline and classify local government in accordance with there GHG emissions characteristics using cluster analysis. This study consisted of following two steps. First, we calculate the account of local government's GHG emissions from such sectors as energy, land-use, and waste. Second, we classified cities as three classes using cluster and factor analysis. This study has found the following results: 1) seventy-three local government's GHG emissions and variations at 2002 to 2007. 2) they are classed as 3 characteristics. First class has too many people and a high density of population. Second class has too many financial institution and vehicle, and Third class has too many living and commerce areas.
정지형(Jeong, Ji Hyeong),반영운(Ban, Yong Un),백종인(Baek, Jong In),최나래(Choi, Na Rae),김유미(Kim, Yu Mi) 한국지역개발학회 2010 한국지역개발학회 세미나 논문집 Vol.2010 No.3
Recently, local governments tend to calculate the amount of greenhouse gas(GHG) emissions, so that they set up reduction target to respond to climate change. This study has intended to calculated the account of local government s GHG emissions through 2006 IPCC guideline and classify local government in accordance with there GHG emissions characteristics using cluster analysis. This study consisted of following two steps. First, we calculate the account of local government s GHG emissions from such sectors as energy, land-use, and waste. Second, we classified cities as three classes using cluster and factor analysis. This study has found the following results: 1) seventy-three local government s GHG emissions and variations at 2002 to 2007. 2) they are classed as 3 characteristics. First class has too many people and a high density of population. Second class has too many financial institution and vehicle, and Third class has too many living and commerce areas.
반영운 ( Yong Un Ban ),정지형 ( Ji Hyeong Jeong ),우혜미 ( Hye Mi Woo ),백종인 ( Jong In Baek ) 한국환경복원녹화기술학회 2009 한국환경복원기술학회지 Vol.12 No.4
This study has intended to build ecological networks in consideration of life-zones inside Cheongju city through biotope grade, GIS network analysis etc. This study consisted of following three steps. First, we selected core districts and core spot districts using land use patten and biotope grade. The core district included the first grade of biotope and forest land. The core district consisted of two sectors: east axis core, Uam mountain; west axis core, Bumo mountain. The core spot district included the first grade of biotope. The core spot districts consisted of two sectors: north axis base core, Myongshim park; south axis base core, Guryong park. Second, the base district included the second grade of biotope and park and school. We used buffering analysis within 500m of the base district and selected the new base district. Third, we connected core districts and base core districts using least cost analysis of GIS. Thus we built comprehensive ecological networks in consideration of life-zones through GIS.
국민임대주택단지 거주자의 부대복리시설 이용 만족도에 영향을 미치는 요인 분석 : 청주시를 중심으로
신승원(Shin, Seung Won),정지형(Jeong, Ji Hyeong),백종인(Baek, Jong In),반영운(Ban, Yong Un) 韓國不動産學會 2011 不動産學報 Vol.47 No.-
1. CONTENTS (1) RESEARCH OBJECTIVES The purpose of this study was to analyze the determinants to affect the satisfaction level of utilizing welfare facilities by residents living in public rental housing complex in Cheongju City. (2) RESEARCH METHOD This study employed a survey method to ask residents to answer their satisfaction level of using welfare facilities and their preference level of exterior facilities in public rental housing, mediation effect analysis to analyze the determinants, and stepwise regression analysis to analyze the determinants about mediation factor. (3) RESEARCH RESULTS This study has found were as follows: 1) this study has found satisfaction level of welfare facility as a mediation effect rector: 2) welfare facilities satisfaction has shown the determinants including community space and cultural Space. 2. RESULTS This study has intended to analyze the determinants to affect the satisfaction level of utilizing welfare facilities by residents living in public rental housing complex in Cheongju City, this study has found satisfaction level of welfare facility as a mediation effect factor and welfare facilities satisfaction has shown the determinants including community space and cultural Space.
반영운(Ban Yong Un),백종인(Baek Jong In),한경민(Han Kyung Min),정지형(Jeong Ji hyeong),김유미(Kim Yu Mi) 한국지역개발학회 2012 韓國地域開發學會誌 Vol.24 No.3
The purpose of this study is to conduct an integrated evaluation of the greenways in Cheongju City in terms of its visual landscape, ecological landscape, and physical connection. For this purpose, the study was conducted in the following four stages. First, evaluation indicators for greenway evaluation were selected based on reviewing previous studies, and field surveys were conducted. Second, findings from the field survey by each evaluation indicator were classified into 5 scales according to a statistical classification system. Third, an expert AHP survey on the evaluation indicators was carried out to calculate the weight of the indicators. Fourth, a greenway integrated-evaluation index was assessed using the findings from the field survey and the weight of indicators. The index was classified into 8 types. The results from the study were as follows. Among the greenways in Cheongju City, two locations (Toad ecological wetland section 2·3) were categorized as visual landscape superiority (type1); three locations (Toad ecological wetland section 1, Uam-mountain section 3, Sangdang Park section 2) as visual & ecological landscape superiority (type2); five locations (Uan-mountain section 1·2, Sangdang Park section 1) as visual & ecological landscape-physical connection inferiority (type3); one location (Jungang Park section 3) as ecological landscape superiority (type4); six locations (Uncheon Park section 2, Janggubong Park section 2, Geumcheon Sports Park section 1·2·3, Jungang Park section 2) as visual landscape-physical connection superiority (type5); two locations (Uncheon Park section 1, Jungang Park section 1) as physical connection superiority (type6) three locations (Janggubong Park section 3, Jungheung Park section 2, Sangdang Park section 3) as visual & ecological landscapephysical connection superiority (type7); and two locations (Uncheon Park section 3, Janggubong Park section 1) as ecological landscape-physical connection superiority (type8). The study result indicate that systematic planning is required for the rest of the greenways except of those categorized as type 7 having superior visual and ecological landscape and physical connectivity.