CIE 표준 담천공과 청천공 모델의 천공 휘도분포 예측 방법에 관한 연구

김철호(Kim Chul-Ho),김강수(Kim Kang-Soo) 한국태양에너지학회 2016 한국태양에너지학회 논문집 Vol.36 No.3

Daylight is an important factor which influences building energy efficiency and visual comfort for occupants. It is important to predict precise sky luminance at the early stages of design to reduce light energy in the building. This study predicted sky luminance distributions of tandard sky model(CIE overcast sky, CIE clear sky) that was provided from the CIE(Commission internationale de l"éclairage). Afterward, result of sky luminance was compared and verified with simulation value of Radiance program. From the CIE overcast sky, zenith and horizon ratio is about 3:1. From the CIE clear sky, luminance value gets most high value around the sun. On the other hand, luminance value is the lowest in the opposite direction of the sun when angle is 90˚ between the sun and sky element. As a result of comparing the calculation results with Radiance program, sky luminance prediction error rate is 0.4∼1.3% when it is CIE overcast sky. Also, sky luminance prediction error rate is 0.3∼1.5% when it is CIE clear sky. When compared with the results of radiance simulation, it was evaluated as fairly accurate.

Effects of an Advanced Radiation Parameterization on a Troposphere-Stratosphere AGCM Simulation

Hyung-Jin Kim,Il-Ung Chung,Kyu-Tae Lee 한국기상학회 2009 Asia-Pacific Journal of Atmospheric Sciences Vol.45 No.4

The impacts of implementing state-of-the-art radiation packages on the radiative energy budget and troposphere-stratosphere circulations of a global climate model are investigated. The parameterizations newly incorporated are Chou and Suarez (2002) for solar radiation and Chou et al. (2003) modified by Chou and Lee (2005) for infrared radiation, respectively, while the previous schemes are based on Oh (1989) for both processes. The advanced packages result in increased biases in the clear-sky shortwave fluxes. However, unlike the random errors produced by the previous parameterizations, those biases are systematic and hence understandable to a considerable extent. Updating surface reflectivity and inclusion of aerosol radiative forcings are inferred to be essential to reduce the biases over the global land and the global ocean, respectively. Meanwhile, the clear-sky outgoing longwave radiation biases are generally decreased and change in sign. Again, the biases are explainable and attributed to the temperature biases and weakening of greenhouse effects due to the reduction in the tropospheric water vapor. The implementation rectifies the simulated temperature structures in the upper troposphere and stratosphere, entailing improved zonal wind in terms of the intensity and position of the polar night jet and the subtropical jet, and the separation between these two jet cores. The simulated wintertime stationary waves also show desirable changes. The amplitudes of wave activity are intensified as a result of the realistic southward displacement of the modeled subtropical westerly jets. The vertical and horizontal phase propagations of the longest two zonal waves become comparable to those of the observed. However, in spite of the realistic meridional temperature gradient reproduced in the summer hemispheric stratosphere, the seasonal reversal of the stratospheric zonal wind direction remains unsatisfactory.

천리안 위성영상과 MODIS 에어로졸 영상을 이용한 캄보디아 프놈펜 지역의 청천일사량 계산

구영현(YoungHyun Koo),오명찬(Myeongchan Oh),박형동(Hyeong-Dong Park) 한국태양에너지학회 2018 한국태양에너지학회 학술대회논문집 Vol.2018 No.4

ASHRAE Clear-Sky 모델을 이용한 24시간 태양광발전량 예측

이문수(Munsu Lee),이원준(Wonjun Lee),Fauzan Hanif Jufri,정재성(Jaesung Jung) 한국신재생에너지학회 2016 한국신재생에너지학회 학술대회논문집 Vol.2016 No.11

Fog Detection Using Geostationary Satellite Data: Temporally Continuous Algorithm

이정림,정추용,오미림 한국기상학회 2011 Asia-Pacific Journal of Atmospheric Sciences Vol.47 No.2

A fog detection algorithm that uses geostationary satellite data has been developed and tested. This algorithm focuses on continuous fog detection since temporal discontinuities, especially at dawn and dusk, are a major problem with current fog detection algorithms that use satellite imagery data. This is because the spectral radiance at 3.7 μm contains overlapping emissive and reflectance components. In order to determine the radiance at 3.7 μm under fog conditions, radiative transfer model simulations were performed. The results showed that the radiance at 3.7 μm obviously varies with the solar zenith angle, and the brightness temperature differences between 3.7 μm and 10.8 μm are completely dissimilar between day and night (positive and varying with the angle during the daytime, but negative and constant at night). In this algorithm, a dynamic threshold is used as a function of the solar zenith angle. Moreover, additional criteria such as infrared, split-window channels, and a water vapor channel are used to remove high-level clouds. Also, the visible reflectance (0.67 μm)channel is used in the daytime algorithm because visible channel images are very practical for confirming a fog area with the high reflectivity and the smooth texture. The clear-sky visible reflectance for the previous 15 days was also employed to eliminate the surface effect that appeared during dawn and dusk. As the results, fog areas were estimated continuously, allowing the lifecycle of the fog system, from its development to decline, to appear obviously in the resulting images. Moreover, the estimated fog areas matched well with surface observations, except in a high latitude region that was covered by thin cirrus clouds

최승희의 무용 작품 고찰 - 1956∼1957년 소련 순회공연을 중심으로 -

한경자(Han, Kyung-Ja) 숭실대학교 한국문학과예술연구소 2020 한국문학과 예술 Vol.35 No.-

본 연구는 최승희의 월북 이후 무용 활동을 중심으로, 소련 순회공연에서 공연된 작품 곡목 구성을 구체적으로 분석하는 것을 목적으로 한다. 선행연구에 의하면 월북 이후 동유럽과 소련에서 최승희의 공연 활동에 대한 연보가 일부 전해진 바 있으나 구체적인 레퍼토리에 대해서는 밝혀진 바 없다. 이에 본 연구는 소련에서 발간된 1956년부터 1957년까지 소련 순회공연 책자를 확보하여, 당시 구체적인 레퍼토리와 최승희 무용연구소 소속 단원들의 역할이 명확히 제시되었음을 확인하였다. 소련에서 공연된 작품은 무용극 <사도성의 이야기>, <맑은 하늘 아래서>, <조선의 어머니> 그리고 세계 순회공연 때 소개된 조선무용 부문 소품종목의 일부와 함께 월북 이후 새로 창작된 소품 종목이 함께 공연되었다. 프로그램에는 월북 이전 세계 순회공연 때와 같이 연출과 대본, 미술, 음악, 출연진의 역할과 인물, 줄거리 요약이 구체적으로 제시되었다. 책자의 마지막에는 최승희 무용연구소의 단원과 그들의 역할이 명시되었다. 월북 이전에 세계 순회공연 시에는 <검무>, <초립동>, <신노심불로>, <즉흥무>, <산조춤>, <석굴암의 벽조>와 같은 개인무나 소품 위주의 작품 구성이었으나, 월북 이후의 공연 활동에서는 대규모 무용단원을 이끌고 무용극 중심의 레퍼토리 구성을 이루었음을 확인할 수 있다. 이는 월북 이전 일제하에서 단원구성과 대규모 공연 시행의 어려운 환경과는 달리 북한 정권으로 부터 전폭적인 지원하에 대규모 공연단이 구성되어 무용극으로 공연이 가능했던 것으로 분석된다. This study aims at analyzing the arrangement of the titles of performance on tour in CCCP after Choi Seung-hee"s defecting to North Korea. Even though previous studies report some of annuals of her performing activities in Eastern Europe and CCCP after her moving to North Korea, they have yet revealed no concrete repertoire. This study, therefore, on the basis of a "secured" booklet for the provincial performance from 1956-1957 which was published in CCCP, confirms that the specific repertoire at that time and the roles of the members of the Choi Seung-hee Dance Institute were clearly presented in it. The repertoire included 〈The Story of Sado Castle〉, 〈Under the Clear Sky〉, 〈The Mother of Joseon〉 in the dance drama; and some small pieces of work in Joseon Dance which had been introduced during the world tour, and those newly created after going over to North Korea. The production and script, art, music, the roles and characters of the cast, and the plot were presented in detail in the program, and it was in the same manner as when performed on her world tour before defecting to North Korea. At the end of the booklet, the members of the Choi Seung-hee Dance Institute and their roles were specified. During her world tour prior to going over to North Korea, she performed mainly solo dances such as 〈Geommu(Sword Dance)〉, 〈Choripdong(Child with a Straw Hat on)〉, 〈Aging Body, Anti-aging Mind〉, 〈Impromptu Dance〉, 〈Sanjo Dance(Dance for Free-style Instrumental Solo of Korean Folk Music)〉, and 〈Relievos of Seokguram Grotto〉, and small pieces of work. On the other hand, in the performing activities after her defecting to North Korea, she led a large dance group and choreographed works focusing on the dance drama. The analysis is that whereas it was so difficult to organize members and perform large-scale performances in the social circumstances of the Japanese rule, it was possible to form a large-scale performance group to perform a dance drama with full support from the North Korean regime.

천리안 위성 영상 기반 태양자원지도를 활용한 다양한 정의에서의 청천지수 특성 분석

김창기,김현구,강용혁,윤창열 한국태양에너지학회 2019 한국태양에너지학회 논문집 Vol.39 No.3

Clear sky indices were estimated by various ways based on in-situ observation and satellite-derived solar irradiance. In principle, clear sky index defined by clear sky solar irradiance indicates the impacts of cloud on the incoming solar irradiance. However, clear sky index widely used in energy sciences is formulated by extraterrestrial irradiance, which implies the extinction of solar irradiance due to mainly aerosol, water vapor and clouds drops. This study examined the relative difference of clear sky indices and then major characteristics of clear sky irradiance when sky is clear are investigated. Clear sky is defined when clear sky index based on clear sky irradiance is higher than 0.9. In contrast, clear sky index defined by extraterrestrial irradiance is distributed between 0.4 and 0.8. When aerosol optical depth and air mass coefficient are relative larger, solar irradiance is lower due to enhanced extinction, which leads to the lower value of clear sky index defined by extraterrestrial irradiance.

천리안 기상위성을 이용한 한반도 지역의 Linke turbidity 및 청천일사량 추정

송아람,최강혁,정민경,김용일 한국신·재생에너지학회 2016 신재생에너지 Vol.12 No.S1

An estimation of the clear sky irradiance is a crucial part of satellite based methods because it is employed to calculatethe clear sky index. Although the accuracy of the clear sky irradiance depends on the AOD (Aerosol Optical Depth) and TPW (TotalPrecipitable Water) mixing ratio, data are difficult to acquire in real time. The Linke turbidity factor simplifies the data as a uniqueparameter that describes the attenuation of solar radiation in terms of a clean and dry atmosphere. SoDa provides the Linke turbiditymaps all over the world, but those maps have low spatial and temporal resolutions. To estimate the clear sky irradiance over theKorean Peninsula using satellite images, this paper presents a method to estimate the Linke turbidity factor using COMS MI, which isoperated by the Korea Meteorological Administration, and the clear sky irradiance using the ESRA clear sky model. The AOD and theTPW derived from COMS MI were also used to calculate the Linke turbidity. Overall, the results show that the Linke turbidity factorcalculated from COMS MI has higher accuracy than that calculated using the SoDa data.

천리안 기상위성을 이용한 한반도 지역의 Linke turbidity 및 청천일사량 추정

송아람(Ahram Song),최강혁(Kanghyeok Choi),정민경(Minkyung Jung),김용일(Yongil Kim) 한국신재생에너지학회 2016 신재생에너지 Vol.12 No.S2

An estimation of the clear sky irradiance is a crucial part of satellite based methods because it is employed to calculate the clear sky index. Although the accuracy of the clear sky irradiance depends on the AOD (Aerosol Optical Depth) and TPW (Total Precipitable Water) mixing ratio, data are difficult to acquire in real time. The Linke turbidity factor simplifies the data as a unique parameter that describes the attenuation of solar radiation in terms of a clean and dry atmosphere. SoDa provides the Linke turbidity maps all over the world, but those maps have low spatial and temporal resolutions. To estimate the clear sky irradiance over the Korean Peninsula using satellite images, this paper presents a method to estimate the Linke turbidity factor using COMS MI, which is operated by the Korea Meteorological Administration, and the clear sky irradiance using the ESRA clear sky model. The AOD and the TPW derived from COMS MI were also used to calculate the Linke turbidity. Overall, the results show that the Linke turbidity factor calculated from COMS MI has higher accuracy than that calculated using the SoDa data.

기상청 전구 수치예보모델을 활용한 Himawari-8/AHI 청천복사휘도 편차 특성 분석

김보람,신인철,정주용,정성훈 대한원격탐사학회 2018 大韓遠隔探査學會誌 Vol.34 No.6

The clear sky radiance (CSR) is one of the baseline products of the Himawari-8 which was launched on October, 2014. The CSR contributes to numerical weather prediction (NWP) accuracy through the data assimilation; especially water vapor channel CSR has good impact on the forecast in high level atmosphere. The focus of this study is the quality analysis of the CSR of the Himawari-8 geostationary satellite. We used the operational CSR (or clear sky brightness temperature) products in JMA (Japan Meteorological Agency) as observation data; for a background field, we employed the CSR simulated using the Radiative Transfer for TOVS (RTTOV) with the atmospheric state from the global model of KMA (Korea Meteorological Administration). We investigated data characteristics and analyzed observation minus background statistics of each channel with respect to regional and seasonal variability. Overall results for the analysis period showed that the water vapor channels (6.2, 6.9, and 7.3 μm) had a positive mean bias whereas the window channels (10.4, 11.2, and 12.4 μm) had a negative mean bias. The magnitude of biases and Uncertainty result varied with the regional and the seasonal conditions, thus these should be taken into account when using CSR data. This study is helpful for the pre-processing of Himawari-8/Advanced Himawari Imager (AHI) CSR data assimilation. Furthermore, this study also can contribute to preparing for the utilization of products from the Geo-Kompsat-2A (GK- 2A), which will be launched in 2018 by the National Meteorological Satellite Center (NMSC) of KMA. 청천복사휘도는 히마와리-8호 정지궤도 기상위성에서 제공되는 주요 산출물 중의 하나로서, 자료동화 과정을 통해 수치예보 정확도 향상에 기여한다. 특히, 청천복사휘도는 대기운동벡터와 함께 대기 상층에서 자료동화의 효과를 보인다. 본 연구에서는 히마와리-8호 청천복사휘도의 편차 특성 분석과 평가를 통해 자료를 활용하는 사용자에게 정보를 제공해주고, 효과적으로 자료를 사용할 수 있도록 수치예보모델자료를 활용한 편차와 불확실성을 계산하였다. 일본 기상청에서 제공되는 청천복사휘도를 관측 자료로 사용하였고, 17 km 공간해상도의 기상청 전구 모델 Unified Model(UM) 자료와 복사전달모델 RTTOV-v11.2를 이용하여 청천복사휘도를 모의하였다. 먼저, 관측자료의 특성을 파악하고 관측자료와 모의된 청천복사휘도의 채널별 편차특성을 분석하였다. 전반적인 결과는 히마와리-8호 위성의 세 개의 수증기 채널(6.2, 6.9, 7.3 μm)에서는 양의 편차를 보인 반면에 대기창 적외 채널(10.4, 11.2, 12.4 μm)에서는 음의 편차를 보였다. 또한 분석결과는 계절과 영역에 따라 상이하게 나타났으며, 특히 사막이나 고지대 지역의 편차 특성이 뚜렷하게 나타났다. 이를 통해 청천복사자료를 활용할 때 시공간적인 특성을 고려해야 함을 확인할 수 있었다. 본 연구의 결과는 히마와리-8호 AHI의 청천복사휘도를 자료동화 할 때 전처리 과정에서 유용하게 활용될 수 있을 것이며, 2018년에 발사된 천리안-2A 호의 산출물 활용에도 도움이 될 것으로 기대한다.