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장영기,송우석,Chang, Young Ki,Song, Woo Seok 한국압력기기공학회 2012 한국압력기기공학회 논문집 Vol.8 No.3
A seawater pumps in the nuclear power plant is responsible for providing cooling water to other components all the time. Because of the depreciation, the seawater pump with current impeller consumes too much power for maintaining the total head. Therefore the objective of this study is to reduce power with maintaining certain the total head by cutting the current impeller. By using a commercial CFD code, FLUENT, the overall performance of seawater pump with current and modified impeller was simulated. Also Affinity law was applied at pumps with various impeller diameter and evaluated the validity of the affinity law. The numerical results show that the pump efficiency is quite irrelevant to the diameters of the impellers and the pump efficiency becomes worse over the designed flow rate. And affinity law result and numerical one show good agreements at small change of impeller diameter. One of the impeller diameters was decided to modify and was applied to the nuclear power plant with the numerical study above.
장영기 수원대학교 산업기술연구소 2004 산업기술연구소논문집 Vol.19 No.-
The purpose of this study was to estimate the greenhouse gas omissions from source categories in Kyonggi-do in 1999, and characteristics of emission in this area were compared with nation-wide emissions. Revised 1996 IPCC guidelines and emission factors recently reported in Korea were used to estimate emission of greenhouse gas. In this study, CO₂ emission was estimated as 44,668 thousand tons, CH₄ as 190 thousand tons and N₂O as 1.0 thousand tons in Kyonggi-do, 1999. So greenhouse gas emission in this area was estimated as 13,414 thousand tons of carbon equivalent, and this emission was correspond to 11.4 precent of nation-wide emissions and 1.48 tons of carbon equivalent per capita. And it was estimated that CO₂ was contributed as 91.4 %, CH₄ as 8.0 % and N₂O as 0.6 % to the total greenhouse gas emission in Kyonggi-do, 1999. The characteristics of greenhouse gas emission in Kyonggi-do were analyzed that portions of emission from residential part(26.0%) and transport part(25.5%) were higher than portions of nation-wide emission. On the other hand, a portion of greenhouse gas reduction by forestry in Kyonggi-do was lower than that of nation-wide. It is believed that these characteristics were due to construction of new cities and higher population growth in this area.
권태인,장영기 國立 昌原大學校 基礎科學硏究所 1993 基礎科學硏究所論文集 Vol.4 No.-
R을 단위원을 갖는 환, P를 우측 R-가군이라 하자. R의 ideaⅠ에 대하여 P의 모든 부분가군이 P/Ⅰ형 일때 P를 곱셈가군이라 한다. 본 논문에서는 곱셈가군의 여러성질(정리 3.1)에 대하여 연구한다.
MECHANICAL 과 Fugitive Dust Model 을 이용한 비포장도로에서의 비산먼지 발생량 산정 및 주변영향 평가
장영기,김인수 한국환경영향평가학회 2000 환경영향평가 Vol.9 No.4
This study is to investigate the methodology and applicability on emission control by both MECHANICAL Model and Fugitive Dust Model (FDM) through the comparison of field measurement data and calculated data. Comparing to the method of AP-42 emission fector on the production of flying dust the MECHANICAL Model was proved to be more applicable to the calculation emission rate on the various dust emission conditions on a unpaved road. The seperate caluculation on annual mean emission amount and a 24working hours amount was undertaken for the easy management of fugitive dust. Dust concentration predicted by FDM is similar with a measurement value.