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RISS 인기검색어
- 검색키워드
- 저자 : 박은우 ( E. W. Park ) (검색결과 11 건)
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농업기상재해 조기경보시스템에서의 고해상도 격자형 자료의 처리 속도 향상 기법
박주현,신용순,김성기,강위수,한용규,김진희,김대준,김수옥,심교문,박은우,Park, J.H.,Shin, Y.S.,Kim, S.K.,Kang, W.S.,Han, Y.K.,Kim, J.H.,Kim, D.J.,Kim, S.O.,Shim, K.M.,Park, E.W. 한국농림기상학회 2017 한국농림기상학회지 Vol.19 No.3
The objective of this study is to enhance the model's speed of estimating weather variables (e.g., minimum/maximum temperature, sunshine hour, PRISM (Parameter-elevation Regression on Independent Slopes Model) based precipitation), which are applied to the Agrometeorological Early Warning System (http://www.agmet.kr). The current process of weather estimation is operated on high-performance multi-core CPUs that have 8 physical cores and 16 logical threads. Nonetheless, the server is not even dedicated to the handling of a single county, indicating that very high overhead is involved in calculating the 10 counties of the Seomjin River Basin. In order to reduce such overhead, several cache and parallelization techniques were used to measure the performance and to check the applicability. Results are as follows: (1) for simple calculations such as Growing Degree Days accumulation, the time required for Input and Output (I/O) is significantly greater than that for calculation, suggesting the need of a technique which reduces disk I/O bottlenecks; (2) when there are many I/O, it is advantageous to distribute them on several servers. However, each server must have a cache for input data so that it does not compete for the same resource; and (3) GPU-based parallel processing method is most suitable for models such as PRISM with large computation loads.
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조성인,배영민,윤진일,박은우,황헌,Cho, S. I.,Bae, Y. M.,Yun, J. I.,Park, E. W.,Hwang, H. 한국농업기계학회 2000 바이오시스템공학 Vol.25 No.2
A forcasting scheme for daily solar irradiance on agricultural field sis proposed by application of chaos theory to a long term observation data. It was conducted by reconstruction of phase space, attractor analysis, and Lyapunov analysis. Using the methodology , it was determined whether evolution of the five climatic data such as daily air temperature , water temperature , relative humidity, solar radiation, and wind speed are chaotic or not. The climatic data were collected for three years by an automated weather station at Hwasung-gun, Kyonggi-province. The results showed that the evolution of solar radiation was chaotic , and could be predicted. The prediction of the evolution of the solar radiation data was executed by using ' local optimal linear reconstruction ' algorithm . The RMS value of the predicting for the solar radiation evolution was 4.32 MJ/$m^2$ day. Therefore, it was feasible to predict the daily solar radiation based on the chaos theory.
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벼 흰잎마름병균(Xanthomonas campestris pv. oryzae)의 形質轉換體에 관한 연구
張誠完,趙鏞涉,朴恩雨 서울大學校 農科大學 1986 서울대농학연구지 Vol.11 No.1
Transformation between races of Xanthomonas campestris pv. oryzae was attempted to illustrate possible occurrance of new races or strains of greater virulence than their parental strains. An auxotrophic mutant(JB206A-1(race K1)) requiring either methionine or cystein, and a white colony mutant(JB 8206W-1(race K1))were transformed to prototroph and yellow colony formation respectively, by treating with DNA of HB83216(race K2) or JN8041(race K3). On the average, transformants showed increased virulence to rice cultivar Milyang 23 as compared with their recipient strains. Three transformants of JB8206A-1 treated with DNA of JN8041 were virulent to rice cultivar Cheongcheong as well as Milyang 23. The standard deviations of lesion lengths on the differential cultivars were greater for transformants than for respective parental strains, suggesting that transformants were genetically more heterogeneous than their parental strains. Bacteriological characteristics of transformants were generally similar to those of their parental strains. However, Two transformants of JB8206W-1 exhibited positive reaction in nitrate reduction although their parental strains showed negative reaction.
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