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우리 나라의 순1차 생산력 및 벼 수량의 지역성과 변이성
정영상,방정호,林 陽生 한국농림기상학회 1999 한국농림기상학회지 Vol.1 No.1
Rice yield and primary productivity(NPP) are dependent upon the variability of climate and soil. The variability and regionality of the rice yield and net primary productivity were evaluated with the meteorological data collect ed from Korea Meteorology Administration and the actual rice yield data from the Ministration of Agriculture and Forestry , Korea. The estimated NPP using the three models, dependent upon temperature (NPP - T ), precipitation (NPP - P ) and net radiation (NPP - R), ranged from 10.87 to 17.52 Mg ha^-1 with average of 14.69 Mg ha^-1 in the South Korea and was ranged 6.47 to 15.58 Mg ha^-1 with average of 12.59 Mg ha^-1 in the North Korea. The primary limiting factor of NPP in Korea was net radiation, and the secondary limiting factor was temperature. Spectral analysis on the long term change in air temperature in July and August showed periodicity. The short periodicity was 3 to 7 years and the long periodicity was 15 to 43 years. The coefficient of variances, CV, of the rice yield from 1989 to 1998 ranged 3.23 percents to 12.37 percents which were lower than past decades. The CV's in Kangwon and Kyeongbuk were high while that in Chonbuk was the lowest. The prediction model based on the yield index and yield response to temperature obtained from the field crop situation showed reasonable results and thus the spatial distributions of rice yield and predicted yield could be expressed in the maps. The predicted yields was well fitted with the actual yield except Kyungbuk. For better prediction, modification should be made considering radiation factor in further development.
Ishinabe Takahiro,Isa Hayato,Shibata Yosei,Fujikake Hideo 한국정보디스플레이학회 2022 Journal of information display Vol.23 No.1
We propose junction-type, vertically aligned polymer network liquid crystals using plastic substrates for flexible smart windows, in which the spacers are formed with the imprinting method and are bonded to the substrate surface by UV-curable reactive mesogen (RM). We clarified that the optical property can be improved by suppressing the aggregation of RMs around the spacers through thinning of the coating of the RM and the simultaneous improvement of the wettability of the parallel alignment film. We achieved excellent haze properties of 3.0% with voltage off and 92.7% with voltage on, and high curvature performance with a small curvature radius of 9.0 mm.