http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
무촉매 환원법이 적용된 응용 재연소 방법에 의한 NO<sub>x</sub>와 CO의 저감 효과
이창엽,김동민,백승욱,Lee Chang-Yeop,Kim Dong-Min,Baek Seung-Wook 대한기계학회 2006 大韓機械學會論文集B Vol.30 No.8
From the view of the environmental protection against the use of fossil fuels, the great of efforts have been exerted to find an effective method which is not only pollutant reduction but also high thermal efficiency. Reburning is a useful technology in reducing nitric oxide through injection of a secondary hydrocarbon fuel. In this paper, an experimental study has been conducted to evaluate the hybrid effects of reburning and selective non-catalytic reaction (SNCR) on $NO_x/CO$ reduction from oxygen-enriched LPG flame. Experiments were performed in flames stabilized by a co-flow swirl burner, which was mounted at the bottom of the furnace. Tests were conducted using LPG gas as main fuel and also as reburn fuel. The paper reported data on flue gas emissions, temperature distribution in furnace and various heat fluxes at the wall for a wide range of experimental conditions. Overall temperature in the furnace, heat fluxes to the wall and $NO_x$ generation were observed to increase by oxygen-enriched combustion, but due to its hybrid effects of reburning and SNCR, $NOx/CO$ concentration in the downstream has considerably decreased.
Synthesis of Tris(silyl)methanes by Modified Direct Process
이창엽,한준수,유복렬,정일남,Lee, Chang Yeop,Han, Jun Su,Yu, Bok Ryeol,Jeong, Il Nam Korean Chemical Society 2000 Bulletin of the Korean Chemical Society Vol.21 No.10
Direct reaction of elemental silicon with a mixture of (dichloromethyl)silanes 1 $[Cl_3-nMenSiCHCl_2:$ n = 0 (a), n = 1(b), n = 2(c), n = 3(d)] and hydrogen chloride has been studied in the presence of copper catalyst using a stirred bed reactor equ ipped with a spiral band agitator at various temperatures from $240^{\circ}C$ to $340^{\circ}C.$ Tris(si-lyl) methanes with Si-H bonds, 3a-d $[Cl_3-nMenSiCH(SiHCl_2)_2]$, and 4a-d $[Cl_3-nMenSiCH(SiHCl_2)(SiCl_3)]$, were obtained as the major products and tris(silyl)methanes having no Si-H bond, 5a-d $[Cl_3-nMenSiCH(SiCl_3)_2]$, as the minor product along with byproducts of bis(chlorosilyl)methanes, derived from the reaction of silicon with chloromethylsilane formed by the decomposition of 1. In addition to those products, trichlorosilane and tetra-chlorosilane were produced by the reaction of elemental silicon with hydrogen chloride. The decomposition of 1 was suppressed and the production of polymeric carbosilanes reduced by adding hydrogen chloride to 1. Cad-mium was a good promoter for and the optimum temperature for this direct synthesis was $280^{\circ}C$.
분할화염형 저공해 연소기의 NOx 및 CO 배출특성에 대한 실험적 연구
이창엽(Changyeop Lee),장병화(Byunghwa Jang),유미연(Miyeon Yoo),맹새롬(Saerom Maeng),소성현(Sunghyun So) 한국에너지기후변화학회 2017 에너지기후변화학회지 Vol.12 No.2
An experimental study has been performed to examine nitrogen oxides(NOx), carbon monoxide(CO) emission characteristics of a burner used for the industrial boiler. Divided Multi flames those are heavily weighted fuel lean/rich region were formed on the developed burner. It can reduce emission concentration of pollutant such as NOx because of low flame temperature and equivalence ratio control. In the experimental condition, excess air ratio of overall combustion zone was 1.21 for the clear combustion and it was fixed during the experiment. However, each small flames were classified into two types, fuel rich flame(excess air ratio was 0.7) and fuel lean flame(excess air ratio was 1.56). However, extreme fuel lean/rich condition caused flame instability and CO emission increase. In this study, mixing chambers were used to maintain the flame stable. As a result, CO emission was decreased to near zero when the temperature of combustion air was 80°C, as well as NOx emission was slightly decreased.
산소부화 LPG 화염에서 혼합형 재연소 방법에 의한 NOx 저감 효과
이창엽(Chang Yeop Lee),백승욱(Seung Wook Baek) 한국연소학회 2007 한국연소학회지 Vol.12 No.4
In order to enhance combustion efficiency, oxygen-enriched combustion is used by increasing the oxygen ratio in the oxidizer. However, since the flame temperature increases, NOx formation in the furnace seriously increases for low oxygen enrichment ratio. In this case, reburning is a useful technology for reducing nitric oxide. In this research, experimental studies have been conducted to evaluate the hybrid effects of reburning/selective non-catalytic reaction (SNCR) and reburning/air staging on NOx formation and also to examine heat transfer characteristics in various oxygen-enriched LPG flames. Experiments were performed in flames stabilized by a co-flow swirl burner, which were mounted at the bottom of the furnace. Tests were conducted using LPG gas as main fuel and also as reburn fuel. The paper reported data on flue gas emissions, temperature distribution in furnace and various heat fluxes at the wall for a wide range of experimental conditions. Overall temperature in the furnace, heat fluxes to the wall and NOx generation were observed to increase by low level oxygen-enriched combustion, but due to its hybrid effects of reburning, SNCR and Air staging, NOx concentration in the exhaust have decreased considerably.
마소라 본문 사무엘하 7:1-17에 나타난 다윗의 안식과 두 집에 대한 여호와의 약속
이창엽(Changyop Lee) 대한성서공회 2020 성경원문연구 Vol.0 No.46
2 Samuel 7:1 clearly states that David is the one who enjoys rest. Yahweh’s Words given to David (2Sa 7:5b-7) emphasize Yahweh’s initiative in the building project and the tabernacle as Yahweh’s temporary dwelling place in the past. The author of MT Samuel irregularly uses waw copulative and waw conversive in 8b-11a. The author’s rhetorical intent is only to use waw conversive partly in 9a and 9b. He intends to introduce what Yahweh did to David first, and then to Israel in the past. The author does not describe what Yahweh did to David and Israel according to temporal order or logical result. Therefore, MT 2 Samuel 7:1b and 11a do not seem to be in conflict with one another nor speak of David’s present rest equally. MT 2 Samuel 7 clearly says that rest is not given to David in the future, but has been given to David (2Sa 7:1, 11a). In contrast to the text of 1 Kings 5:3-4 that David is not a man of rest, MT 2 Samuel 7 does not link David’s rest with the building of Jerusalem temple as the precondition to be complied with. Due to the presence of 2 Samuel 7:13a, the whole text of 2 Samuel 7 clearly shows that it is not Yahweh’s intention to ban the temple building itself. 2 Samuel 7 does not search for the reason why David cannot build the Jerusalem temple. The concern of 2 Samuel 7 is not to deal with the qualifications of the temple builder, but to promise that Yahweh will build David’s house. 2 Samuel 7 clearly states that David is not the one who builds the house of Yahweh, but rather tells that David’s son is to do so. The focus of 2 Samuel 7 is on the construction of the house of David and the house of Yahweh respectively.
이창엽 ( Chang-yup Lee ),최창열 ( Chang-yeol Choi ),김성수 ( Sungsoo Kim ) 한국정보처리학회 2005 한국정보처리학회 학술대회논문집 Vol.12 No.1
시스템은 한번에 많은 양의 작업을 처리할 때 과부하로 인해 종종 서비스 제공이 불가능하게 된다. 세션 상태의 이용은 시스템 관리를 용이하게 하여 이런 문제점의 해결에 도움을 줄 수 있다. 하지만 세션 상태의 저장소를 관리하기 위한 기존의 SSM(Session State Manager)이 한번에 처리할 수 있는 서비스의 양에는 한계가 있다. 따라서 본 논문에서는 세션 상태 저장소의 복제를 통해 시스템의 성능을 높이고 서비스의 응답 시간을 줄이기 위한 메커니즘을 제안한다.