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건설기계용 Urea-SCR 시스템의 촉매전단에서 암모니아 균질도 해석 및 DeNOx 성능에 관한 연구
김동환,박준규,강정호,문성준,박성욱,Kim, Donghwan,Park, Junkyu,Kang, Joung-ho,Moon, Seonjoon,Park, Sungwook 한국분무공학회 2019 한국액체미립화학회지 Vol.24 No.2
In this study, the spray atomization characteristics of urea injector used in SCR system for construction machinery was analyzed, and the uniformity index at the front of mixer and NOx conversion efficiency were evaluated through numerical analysis. Spray visualization and droplet size/velocity measurement were performed and the measured results were used to verify the spray analysis model to calculate the uniformity index in the exhaust gas after-treatment system. For the flow analysis, STAR-CCM, a three-dimensional CFD, was used and the uniformity index of the SCR system at the front of the mixer was calculated using the droplet dissociation model and the wall collision model. Finally, the DeNOx performance for the average condition of the NRTC driving mode was calculated to understand the NOx conversion efficiency reflecting the exhaust gas temperature. The simulation results show that the uniformity index at the front of mixer was calculated as 0.862 and DeNOx efficiency was 75.9%.
김동환(Kim Donghwan) 원광대학교 원불교사상연구원 2017 원불교사상과 종교문화 Vol.71 No.-
이 글은 근대 유교지식인의 인식 변화를, 김교헌이라는 인물의 행적을 통해 살펴본 글이다. 김교헌은 조선조 명문가의 후예로서, 구한말 과거급제를 통해 여러 벼슬을 거쳐 종2품 벼슬까지 오른 인물이다. 특히『(증보)문헌비고』와『국조보감』의 참여 경험은, 후일 그의 여러 역사서술의 소중한 경험이 되었다. 그러나 그의 유교에 대한 인식은 대종교를 경험한 이후 완전히 바뀌었다. 그의 스승 나철의 ‘국망도존(國亡道存)’의 가르침이 교훈이 된 것이다. 그러므로 역사인식에서는 중화주의 역사관을 탈피한 민족주의 역사관을 구현했으며, 일제강점기라는 시대적 상황 아래 독립투쟁의 정신적 지주 역할을 담당했다. 더불어 대종교 제2세 교주로 취임하면서 교세확장과 독립운동의 거점 마련을 병행하기도 하였다. This paper is aware of the change of modern Confucian intellectuals, Kim Kyo-Heon is shown through that. Kim Kyo-Heon after the example of the famous House of the Joseon Dynasty, an important position, they are rough figures. In particular, the experiences involved in 『MUN-HEON-BIGO(文獻備考)』 and 『GOOK-JO-BO-GAM(國朝寶鑑)』, authored many books on the history of the latter days was an important experience. However, Kim Kyo-Heon only Confucianism awareness has changed completely since the Daejonggyo experienced. Na-Cheol, who was his teacher gave the ‘The country is ruined, even if spirit exists(國亡道存)’ was this teaching of the lesson. Therefore, the interpretation of history, the history of the interpretation center of sinocentrism off the nationalists realized the history, and the struggle for independence during the Japanese occupation plays a central role. In addition, he became General Manager of Daejonggyo, has been developed based on statues of the Daejonggyo.
김동환(Kim, DongHwan),박동규(Park, TongKyu),한민연(Han, MinYeon) 대한부동산학회 2020 大韓不動産學會誌 Vol.38 No.4
본 연구는 입지, 정책과 주거용 부동산 수익률의 관계를 투자자 심리를 활용해 풀어내고자 했다. 부동산투자심리지수는 Baker and Wugler(2006), 김동환·박동규(2017) 등에서 활용한 방법론을 활용하여 도출하였으며 도출된 부동산투자심리가 거시경제상황에 영향을 받을 수 있으므로 Kim and Byun(2010) 등에서 선정한 거시경제변수를 활용하여 직교화된 부동산투자심리지수를 도출하여 분석하였다. 통제변수로는 CD금리, GDP 성장률, 지역별 인구를 선정하고 패널회귀분석을 통해 실증분석을 하였다. 분석결과는 다음과 같다. 첫째, 입지 수준이 높고 정책이 시행된 경우 투자자 심리와 주거용 부동산 수익률의 관계는 음의 관계에 있다는 것으로 나타났다. 둘째, 입지 수준이 높은 지역에서 투자자 심리와 주거용 부동산 수익률의 관계는 음의 관계에 있는 것으로 나타났다. 셋째, 정책이 시행된 경우 투자자 심리와 주거용 부동산 수익률과의 관계는 음의 관계를 나타내는 것으로 보였다. 본 연구는 투자심리 수준에 따라 입지와 정책이 주거용 부동산 수익률에 미치는 영향이 달라질 수 있음을 보여 줌으로써, 기존 연구와 시장 메커니즘에 대해 새로운 해석 및 추가적인 시각을 제공한다. 즉, 부동산시장에서도 행동재무학에서 개발된 이론이 유효하게 적용됨이 입증된 것이다. The study sought to unveil the relationship among location, policy and residential property prices by utilizing investor sentiment. The real estate investor sentiment index was derived using the methodology used by Baker and Wugler(2006) and Kim and Park(2017), and the derived real estate investor sentiment was analyzed by utilizing macroeconomic variables selected by Baker and Wugler(2006) and Kim and Byun(2010). CD rate, GDP growth rate and population by region were selected as control variables and empirical analysis was conducted through panel regression analyses. The analysis results are as follows. First, the relationship between investor sentiment and residential real estate yields when location levels are high and policies are implemented is shown to be negative. Second, the relationship between investor sentiment and residential real estate yields in areas with high location levels has been shown to be negative. Third, when the policy was implemented, investor sentiment and its relationship with residential real estate returns seemed to indicate a negative relationship. This study provides a new interpretation and additional perspectives on existing research and market mechanisms by showing that location and policy impact on residential real estate yields may vary depending on the level of investor sentiment. Empirical evidences found in behavioral finance has proven to be valid in the real estate market as well.
농산물 산지유통조직의 성과 결정요인 분석: 협의 판매사업을 중심으로
김동환 ( Donghwan Kim ),채성훈 ( Sunghoon Chae ) 한국협동조합학회 2010 韓國協同組合硏究 Vol.28 No.2
This study analyzes factors affecting performance of agricultural cooperatives`` marketing activities. Sales by pooling arrangement, operating income, evaluation score by the government are used as dependent variables which represent performance of agricultural cooperatives’ marketing activities. Various independent variables representing characteristics of agricultural cooperatives and their employees are used in this analysis. For the sales by pooling arrangement equation and the evaluation score equation, specialty cooperatives, participation level of cooperative members, sales by marketing agreement with members are positive and significant at the 10 percent level. For the operating income equation, only participation level of cooperative members is positive and significant at the 10 percent level. These empirical results imply that specialization, participation of cooperative members, and sales by marketing agreement with members are important in enhancing performance of marketing activities of agricultural cooperatives.