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최경배 한국자원식물학회 2004 한국자원식물학회지 Vol.17 No.1
‘Dongjanggun’ was developed at the Gyeongbuk Agricultural Research and Extension Services, Taegu in 2000. It was selected among the local varieties gathered korean native chinese chive from 1993 to 1996. It has longer and narrower leaves, stronger flavor than check variety ‘Greenbelt’. And also, contents of ascorbic acid in the leaves of ‘Dongjanggun’ was higher than the ‘Greenbelt’s. Number of tillers per plant was greater in ‘Dongjanggun’ than that in ‘Greenbelt’ during the winter in unheated plastic house. Its growth and regrowing velocity after cutting of top leaves were vigorous. Number of flowers and seeds per umbel were fewer in ‘Dongjanggun’ than in ‘Greenbelt’. Average yield was 6% higher than ‘Greenbelt’s during the thee years. 다수의 국내 재래종 중에서 선발 육성된 ‘동장군’의 주요 특성은 잎이 가늘고 길며, 부추 고유의 향기가 강하고 부추잎의 vitamin C 함량이 높은 품종이었다. 개체당 분얼력이 왕성하고, 예취후 잎의 재생기간이 빠르다. 개화기는 7월 18일로 ‘그린벨트’에 비해 10일 정도 빠르고 개화기간은 다소 짧은 편이다. 화경당 꽃수나 종자수는 대비품종에 비해 적은 편이었다. 잿빛 곰팡이병에 대한 저항성은 약한 편이며 저온에 대한 내성은 비교적 강하다. 3년간 생체수량을 검토한 결과 ‘그린벨트’에 비해 3회 예취 평균수량이 6% 증수되었다.
한반도에서의 전천일사량을 이용한 광합성유효복사량 추정 모델 개발 및 검증
최경배(Choi Kyung Bae),이윤곤(Lee Yun Gon),김창기(Kim Chang Ki) 한국태양에너지학회 2021 한국태양에너지학회 논문집 Vol.41 No.3
Photosynthetically active radiation (PAR; wavelength 400 ~ 700 nm) is the spectral range of solar radiation used by plants for photosynthesis. PAR data are used in various fields of research, such as that focusing on surface vegetation growth, the light energy-chemical energy conversion process, and the terrestrial carbon cycle. In this study, we analyze the variability between Global Horizontal Irradiance (GHI) and PAR according to the solar zenith angle, the clearness index, using GHI and PAR observations from 2016 to 2020 at Anmyeondo Flux Tower of Korea Forest Research Institute (KFRI). We confirm that the PAR decreases and the variability of the ratio of PAR to GHI increases as the atmospheric optical path increases. We also confirmed that the PAR increased and the ratio of PAR and GHI decreased as the clearness index increased. Using the results of these relationships and prior studies, we develop and evaluate empirical models that estimate PAR from GHI. The R² representing the estimation accuracy of the model was 0.988 to 0.996, indicating very high accuracy. With these results, the observation data from the KFRI’s Wando, Pyeongchang, and Samcheok Flux Towers during the same period showed that R² was very high at 0.977 ~ 0.988, confirming its transferability in other regions. Despite the high R², the Mean Bias Error (MBE) for each site was shown to be different. To solve this problem, a model with relative humidity and temperature was developed to apply regional conditions for each site, and showed similar R² to prior models with less MBE. It is expected that the results of this study will be used as policy references such as attracting solar power complexes by drawing up a seasonal map of the Korean peninsula of PAR with solar radiation data observed at the Korea Meteorological Administration"s Automated Synoptic Observing System (ASOS).
대전지역에서 법선면직달일사량을 이용한 광합성유효 복사량의 직달 성분 추정 모델 개발
최경배(Choi Kyung Bae),이윤곤(Lee Yun Gon),김창기(Kim Chang Ki) 한국태양에너지학회 2020 한국태양에너지학회 논문집 Vol.40 No.6
Photosynthetically active radiation (PAR; wavelength 400–700 nm) is the spectral range of solar radiation used by plants for photosynthesis. It is necessary to use PAR data in various fields, such as the surface vegetation growth, light energy–chemical energy conversion process, and terrestrial carbon cycle. In this study, a direct normal irradiance (DNI) spectroradiometer installed at the Korea Institute of Energy Research was used to observe direct insolation over the whole wavelength ranges including PAR. The variabilities in solar radiation and wavelength sensitivity according to the solar zenith angle and the clearness index (an indicator of atmospheric turbidity), were analyzed using data collected during June–October, 2020. As the optical path increased, PAR DNI—having a short wavelength—showed greater attenuation than the near-infrared radiation (NIR). Additionally, an increase in the clearness index under the same optical path increased the PAR DNI relatively more. These results mean that the attenuation effect of atmospheric constituents under optical path can be different depending on the wavelength range. Based on the empirical model presented in previous studies and the observation data in Daejeon, the PAR DNI estimation model using DNI in the entire wavelength range were developed and evaluated. Although it was a short analysis period, each model showed an R² of 90% or more, and the model with the clearness index, an indicator of atmospheric conditions, presented higher estimation accuracy. We expect that further data collection will enhance the accuracy of the model despite seasonal variability. Thus, this research will encourage broader applications of the model in other regions.
태양일사량의 파장범위별 구름과 에어로졸의 상대적 민감도 분석
최경배(Kyungbae Choi),이윤곤(Yun Gon Lee),김창기(Chang Ki Kim) 한국신재생에너지학회 2021 한국신재생에너지학회 학술대회논문집 Vol.2021 No.7
태양 복사는 지구의 기상, 기후 시스템을 조절해, 생태계의 변화 및 유지하는 에너지의 근원이다. 지표면에 도달하는 태양복사는 대기를 통과하면서 수증기, 에어로졸, 오존, 구름 등의 다양한 대기인자들에 의해 산한 및 흡수된다. 대기인자에 따라 파장별로 흡수 및 산란하는 정도가 다르다. 태양 복사 에너지에 대한 연구와 수요가 많아진 지금, 대기를 통과하는 파장별 복사량의 변화를 이해하는 것이 필요하다. 국내외 선행연구에서는 전철일사와 홍반자외선에 구름과 에어로졸의 상대적인 감쇄 효과를 정성/정량적으로 분석하였다. 선행연구의 결과를 확장해 전천일사(Global Horizontal Irradiance, GHI), 광합성유효복사(Photosynthetically Active Radiation, PAR), 자외선(Ultraviolet, UV) 3개의 파장별 복사량의 구름과 에어로졸 광학두께(Aerosol Optical Depth, AOD) 등의 기상인자들에 따른 변화를 분석하고자 한다. 본 연구에서 이뤄진 파장별 투과도에 대한 분석을 토대로 한반도에서의 파장별 태양 복사에 대한 이해에 도움을 줄 것으로 기대된다.