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백남원(N.W. Paik),박두용(D.Y. Park),장익선(I.S. Chang),신용철(Y.C. Shin),이정인(J. l. Lee) 한국환경보건학회 1988 한국환경보건학회지 Vol.14 No.2
Airborne dust and asbestos fiber concentrations were determined in subway stations located in Seoul area. Two stations, such as Eulchiro 4.Ka Station of Une #2, constructed during a period of 1980-1984 and Hyehwa Station of Une #4, opened in 1985, were selected. The results of the study are as follows. 1. Daily tirne.weighted average (1W A) concentrations of airborne dusts from 07:00 to 20:00 hours in Line #2 and μne #4 were 0.43:t0.08 mg/m3 and 0.37:t0.12 mg/m3 , respectively. Thus, the dust levels in Líne #2 were significant1y higher than the levels in Line #4( p < 0.05). 2. Dust levels in the morning (07:00-11:00 hours), noon (1 1:00-16:00 hours) and in the evening (1 6:00-20:00 hours) in Líne #2 were 0.47:t0.17 mgjm3 , 0.37:t0.08 mg/m3 , and 0.46土0.07 mg/m3 respectively. Thus, dust levels in the morning and evening (i.e., during rush hours) were significantly higher than levels in the noon ( p < 0.02). However, there was no such difference in dust levels by time in Líne #4. 3. Airborne total dust concentrations were well below the occupational health standard of 10 mg/m3 , however, the levels were exceeding the ambient air standard recommended by the Korean Environment Administration. 4. All of airborne asbestos fiber concentrations were equal to or below 0.005 fibers/cc. The levels are within both occupational health standards and U .S. EPA criterìa. 5. A consideration should be given to the improvements of c1eaning methods (such as use of vacuum c1eaning instead of brushing) and the existing ventilation (such as more aìr change and filtration of supply air) for a reduction of dust levels. 6. It is recommended that routine monitoring of aìrborne dusts and asbestos fibers be conducted because more dusts and asbestos fibers can be produced in the aìr due to the deterioration of facilities by age and water damage in future.
Myrinet 환경에서 예조건화 Navier-Stokes 코드의 병렬처리 성능
김명호(M.-H. Kim),이기수(G.S. Lee),최정열(J.-Y. Choi),김귀순(K.S. Kim),김성룡(S.-L. Kim),정인석(I.-S. Jeung) 한국전산유체공학회 2001 한국전산유체공학회 학술대회논문집 Vol.2001 No.-
Parallel performance of a Myrinet based PC-cluster was tested and compared with a conventional Fast-Ethernet system. A preconditioned Navier-Stokes code was parallelized with domain decomposition technique, and used for the parallel performance test. Speed-up ratio was examined as a major performance parameter depending on the number of processor and the network topology. As was expected, Myrinet system shows a superior parallel performance to the Fast-Ethernet system even with a single network adpater for a dual processor SMP machine. A test for the dependency on problem size also shows that network communication speed is a crucial factor for parallelized computational fluid dynamics analysis and the Myrinet system is a plausible candidate for high performance parallel computing system.
[디젤엔진부문] 디젤산화촉매의 열화에 따른 배기가스특성
이호길(H.K.Lee),강정호(J.H.Kang),이천환(C.H.Lee),김병수(B.S.Kim),류명석(M.S.Lyu),여권구(K.K.Lier),류정인(J.L.Lyu) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Modem diesel vehicle has to comply with the EURO III, IV regulation with very low level of particulate and smoke emission. But diesel engine design technologies are inferior to gasoline engine. Recently, much attention have been focused on diesel exhaust aftertreatment system development. The reducing technologies of exhaust emission for diesel engine classified as common rail, EGR, fuel quality improvement, and development of diesel exhaust aftertreatment. The diesel exhaust aftertreatment technology is considered as the alternative technology in the near future. The diesel exhaust aftertreatment system has been advanced for reducing particulates and emission because it has simple in device structure, relatively low cost and easy to install the vehicle.<br/> In this study it was carried out conversion efficiency test for fresh and aged catalyst. Also it was evaluated the characteristics of exhaust gas and particulate matter emitted from catalyst according to the aging time then particulate matter reduce efficiency due to heat of oxidation reaction at diesel oxidation catalyst(DOC)<br/>
[論文] 가솔린 기관용 초음파 미립화장치의 타당성에 관한 연구(I)-연료 미립화를 중심으로-
조규상(G.S.Cho),이성래(S.L.Lee),최두석(D.S.Choi),류정인(J.I.Ryu) 한국자동차공학회 1987 오토저널 Vol.9 No.4
It is an experimental study to improve the characteristics of combustion and exhaust emission gas in the gasoline engine.<br/> These characteristics are influenced by the fuel droplet size.<br/> To improve these characteristics, we make the ultrasonic atomization apparatus, and compare with the commercial carburetor.<br/> The results obtained are as follows:<br/> 1. Maximum atomization quantity is obtained by the vibrator of resonancy frequency 1.65 MHz in the ultrasonic atomization apparatus.<br/> 2. With ultrasonic atomization apparatus, more than 99% of atomization rate can be obtained regardless of intake air temperature, velocity, and air-fuel ratio.<br/> 3. Atomization rate of the commercial carburetor increases with the air-fuel ratio and intake air temperature.<br/> 4. Difference of atomization rate between the ultrasonic atomization apparatus and the commercial carburetor increases with decreasing air-fuel ratio.<br/> 5. Droplet size is about 1-5um at the ultrasonic atomization apparatus, and 80-150um at the commercial carburetor, which indicates the ultrasonic atomization apparatus is excellent<br/> in atomization.