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점화시기 및 당량비 변화에 따른 CNG기관의 성능 및 배출가스에 관한 연구
한영출,오용석,박봉규,김대열,김미수 한국공작기계학회 2001 한국생산제조학회지 Vol.10 No.4
Research on the development of CNG dedicated en dine that has important meaning both as a clean fuel and an alterna-tive energy to reduce the exhaust emission horn diesel engine are actively going on these days. In this study, in order to present the direction and application of CNG engine, we tested the CNG engine performance experimented by changing the parameters such as ignition timing, equivalent ratio. The engine performance and exhaust emission were measured by engine performance mode at maximum load condition with increasing the rpm in the range of 1,000∼2,200rpm. Also, the testing engine was heavy-duty CNG dedicated engines with displacement of 11,050cc.
소형엔진의 배출가스측정방법에 따른 질소산화물 및 매연에 관한 연구
한영출,나완용,오용석,문병철,박봉규,박귀열 한국공작기계학회 2001 한국생산제조학회지 Vol.10 No.3
Recently, increasing usage of diesel vehicle, many countries try to reduce the pollutant materials by emission regulation standard. Particularly, in our country, the supplement ratio of diesel vehicle is high, and air pollution by vehicle exhaust gas is very serious. So, in study, we tested exhaust gas by various mode in light duty diesel engine. Therefore, we can know about NOx and smoke seriousness.
Bedform Morphology of the Continental Shelf Sandy Sediments Around the Korean Peninsula
SUK, BONG-CHOOL,KAGAMI, HIDEO,TAIRA, ASAHIKO The Korean Society of Oceanography 1994 韓國海洋學會誌 Vol.29 No.3
Bedform morphology of the giant ripples have been studied on the continental shelf of the Yellow Sea, East China sea and Korea-Tsushima Strait on the basis of side-scan sonar image, sub-bottom profile, sedimentary facies, geomorphology evidence and hydrology. There are well developed giant ripples ranging from 100 to 500 m in wavelengths and from 2 to 10 m in wave height at nine sites in the study area, which are covered by medium to fine sand. Most of them have been formed under the present hydrologic regime where the tidal currents and local currents or turbulence flows are superimposed. In the study area, giant ripples are produced on two different environments. One is at the geomorphic narrow zone such as the Korea Strait where currents are accelerated by the topographic effects, while the other is the sandy flat plain where tidal currents and local currents are harmonized.
Bathymetry and Morphotectonic Elements in the Ulleung Basin, East Sea of Korea
Suk, Bong-Chool,Anosov, G.I.,Semakin, V.P.,Svarichevsky, A.S. International Union of Geodesy And Geophysics Kore 1996 Korean Journal of Geophysical Research Vol.24 No.1
A detailed bathymetric map is used to construct a morphotectonic map of the Ulleung Basin. The definition of "morphotectonics" and the procedure of the morphotectonic mapping are described in detail. The morphotectonic structural elements of various orders and ranks are also determined using echo-sounding and other geophysical data. Preliminary analysis shows that the newly determined morpho-structural elements coincide with the locations of deeper tectonic features established by the geophysical evidences of the inner sedimentary and/or crustal sections. Therefore, the tectonic zone of the Ulleung Basin has imprinted the patterns of the inherited evolution since Neogene.e Neogene.
Sedimentary Excess Barium from a Core of the Northwest Pacific Ocean: Geochemical Proxy
Suk, Bong-Chool,Park, Chan-Hong,Taira, Asahiko,Hyun, Sang-Min The Korean Society of Oceanography 2000 Journal of the Korean Society of Oceanography Vol.35 No.2
A geochemical study on a hemipelagic core sediment taken from the northwest Pacific Ocean (eastern edge of the Shikoku Basin) was conducted to use of excess barium (Ba(ex)) for evaluate the paleoceano-graphic changes. Also, the excursion of sedimentary Ba(ex) was compared with those of biogenic opal, carbonate and organic carbon content in the sediment during the last glacial and interglacial periods. The calculated Ba(ex) derived from the major and minor element shows a distinctive glacial-interglacial variations, and the mass accumulation rate (MAR) of Ba(ex) shows coincident variations with the MARs of biogenic fractions. Especially, strong positive correlation (r$^2$=0.85) between the MAR of Ba(ex) and the MAR of biogenic carbonate is recognized. Based on the strong positive correlation(r$^2$=0.85) between the MAR of Ba(ex) and the MAR of carbonate content, we estimated the degree of carbonate dissolution rate during the glacial and interglacial periods. Assuming the proportional variation and the refractory nature of barium exist between two factors, the variation of index Ca/Ba ratio in sediment indicates the degree of carbonate dissolution. Sedimentary Ca/Ba ratios index clearly show a striking fluctuation between the glacial and interglacial periods with higher positive correlation during glacial and lower correlation during interglacial. This fact indicates enhanced carbonate dissolution during interglacial period. Thus, the sedimentary Ca/Ba ratio in sedimentary records can be used as one of the useful tools for estimation of the relative degree of carbonate dissolution. The excursion of Ba(ex) and the sedimentary Ca/Ba ratio follows the typical pacific carbonate dissolution type(enhanced dissolution during interglacial and reduced dissolution during glacial time) as suggested by previous work (e.g., Wu et al., 1990). Variation in sedimentary Ca/Ba ratio thus strongly supports that glacial-interglacial fluctuation in carbonate dissolution has been prevailed in the northwest Pacific Ocean.
Side Scan Sonar 모자이크 매핑에서 중첩영상의 처리
김성렬(Seong-Ryul Kim),석봉출(Bong-Chool Suk),이용국(Yong-Kuk Lee),정백훈(Baek-Hun Jung) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
In the side scan sonar mosaic mapping, the adjacent imageries are overlapped in case that the survey track line interval is narrower than scan range. The general mapping process is that no good imageries are blanketed with the better imageries. Then the overlapped boundary portion of seafloor mosaic image stands out clearly, even though the sea-bottom feature is realistically pictured. The improved method on seafloor sonar image mosaic processing to separate the imageries of this smeared part and to get the high resolution mapping results is proposed.