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Lee, Chulkyu,Choi, Yeo Jin,Jung, Jin Sang,Lee, Jeong Soon,Kim, Ki Hyun,Kim, Young Joon Elsevier 2005 Atmospheric environment Vol.39 No.12
<P><B>Abstract</B></P><P>A Long Path DOAS system (GIST LP-DOAS) developed by GIST has been used to simultaneously measure atmospheric monoaromatic hydrocarbons (MAHC) and other trace compounds. The validity of GIST LP-DOAS in measuring atmospheric MAHC was tested over 740m beam paths at an urban site in Seoul, Korea, during two field campaigns held in February 2003. In order to remove the effects of interfering compounds (such as oxygen, ozone, and sulfur dioxide), two oxygen optical density spectra at two path lengths and the reference spectra of sulfur dioxide and ozone were incorporated in the fitting procedure for the determination of MAHC. The mean concentrations of MAHC measured with LP-DOAS system during the measurement period were 0.77 (benzene), 3.68 (toluene), 0.41 (<I>p</I>-xylene), and 0.54ppbv (<I>m</I>-xylene), respectively. The results of our LP-DOAS measurements were compared with those obtained by a collocated on-line Gas Chromatography (on-line GC) system. The concept of a percent difference (PD) and linear regression methods were employed to explain the bias structure between LP-DOAS and on-line GC. The results of this comparative analysis indicated that both systems exhibited strong compatibility with relatively good correlation. According to our correlation analysis between PD values and meteorological parameters, the compatibility between the two systems increased under the conditions of improved visibility and meteorological homogeneity (wind speed >1.3ms<SUP>−1</SUP>). Based on our study, it is concluded that the LP-DOAS system can be used to provide reliable information on both mixing ratios and temporal distribution characteristics of MAHC in urban air.</P>
기상조절(인공강우와 안개저감)의 경제적 가치 추정 연구
이철규(Chulkyu Lee),장기호(Ki-Ho Chang),차주완(Joo-Wan Cha),정재원(Jae-Won Jung),정진임(Jin-Yim Jeong),양하영(Ha-Young Yang),서성규(Sung-Kyu Seo),배진영(Jin-Young Bae),강선영(Sun-Young Kang),최영진(Young-Jean Choi),조하만(Ha-man Cho) 한국기상학회 2010 대기 Vol.20 No.2
We estimate the economic benefit of weather modification (precipitation enhancement and fog dissipation) by assuming its operation for the considered regions. Based on the statistical data, the economic benefit of the virtually operational precipitation enhancement experiments for the Andong and Imha basins, where the natural precipitation is relatively lack in South Korea, is calculated 348 for the water resources, 22,458 for forest fire prevention, and 28,458 million won/year for the drought relief. The benefit of the fog dissipation operation for the Incheon International Airport is estimated 7,365 million won/year for the flight delay due to fog. The calculated ratio of benefit to cost for precipitation enhancement operation for the basins is 14.07, which is comparable to that conducted in other countries.
이철규,최여진,이정순,정진상,김영준,김기현 한국대기환경학회 2005 한국대기환경학회지 Vol.21 No.1
In this study, a Long Path Differential Optical Absorption Spectroscopy system (K-JIST LP-DOAS) has been used to simultaneously measure atmospheric monoaromatic hydrocarbons and other trace compounds. The validity of the K-JIST LP-DOAS for measuring atmospheric monoaromatic hydrocarbons was tested during a field campaign between 12 February and 14 March 2003 at an urban site in Seoul, Korea through inter-comparative measurements against a collocated on-line Gas Chromatography (GC) system. The concentrations of benzene, toluene, p-xylene, and m-xylene were measured with the K-JIST LP-DOAS system in the UV region (239~302 nm) over a 740 m beam path. For the other trace compounds, a longer spectral range (299~362 nm) was used. In order to remove the interference of atmospheric abundant species (such as oxygen, sulfur dioxide and ozone), two oxygen optical density spectra obtained at two pathlengths, 697 and 1133m, and reference spectra of sulfur dioxide and ozone were incorporated in the fitting procedure. The mean concentrations measured by our LP-DOAS during the measurement period were 0.77 (±0.38) ppbv for benzene, 3.68 (±1.90) ppbv for toluene, 0.41 (±0.19) ppbv for p-xylene, 0.54 (±0.24) ppbv for m-xylene. The concentration data of benzene, toluene, p-xylene and mxylene obtained by our LP-DOAS were found to be in relatively good correlations with those of the online GC system. Pearson’s coefficients in the observed concentrations between LP-DOAS and on-line GC were 0.84 for benzene, 0.83 for toluene and 0.65 for m,p-xylene. This study suggests that the LP-DOAS system can be used to provide reliable information on both the mixing ratios and temporal distribution characteristics of monoaromatic hydrocarbons in the urban air.
ICE-POP 2018 기간 드롭존데 자료를 활용한 강설 구름의 열역학적 특성
정승필(Sueng-Pil Jung),이철규(Chulkyu Lee),김지형(Ji-Hyoung Kim),양효진(Hyo Jin Yang),윤종환(Jong Hwan Yun),고희종(Hee Jong Ko),홍성은(Seong-Eun Hong),김승범(Seung-Bum Kim) 한국기상학회 2020 대기 Vol.30 No.1
The aircraft observation campaign was performed to investigate thermodynamic conditions of snowfall cloud over the East Sea of Korean peninsula from 2 February to 16 March 2018. During this period, four snowfall events occurred in the Yeongdong region and three cases were analyzed using dropsonde data. Snowfall cases were associated with the passage of southern low-pressure (maritime warm air mass) and expansion of northern high-pressure (continental polar air mass). Case 1 and Case 2a were related to low-pressure systems, and Case 2b and Case 3 were connected with high-pressure systems, respectively. And their thermodynamic properties and horizontal distribution of snowfall cloud were differed according to the influence of the synoptic condition. In Case 1 and Case 2a, atmospheric layers between sea surface and 350 hPa contained moisture more than 15 mm of TPW with multiple inversion layers detected by dropsonde data, while the vertical atmosphere of Case 2b and Case 3 were dry as TPW 5 mm or less with a single inversion inversion layer around 750~850 hPa. However, the vertical distributions of equivalent potential temperature (θe) were similar as moist-adiabatically neutral condition regardless of the case. But, their values below 900 hPa were about 10 K higher in Case 1 and Case 2a (285~290 K) than in Case 2b and Case 3 (275~280 K). The difference in these values is related to the characteristics of the incoming air mass and the location of the snowfall cloud.