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원종건,이선형,최장수,박상구,안덕종,박소득,손재근,Won Jong Gun,Lee Sun Hyung,Choi Jang Soo,Park Sang Gu,Ahn Duok Jong,Park So Deuk,Son Jae Keun 한국작물학회 2005 Korean journal of crop science Vol.50 No.suppl1
경북지역의 연차, 품종, 이앙시기, 질소 시비량에 있어서 쌀 품질의 변이를 분석하여 고품질 쌀 생산을 위한 최적 기술 투입을 위한 기초 자료로 사용하기 위해 2002년부터 2004년까지 3년간 시험을 실시한 결과는 다음과 같다. 1. 연차 및 지역별 미질 분석에서 식미치와 아밀로즈 함량의 변이계수가 $3.9\~4.3\%$로 낮아 변이가 적었으며, 단백질 함량과 완전미 비율의 변이계수는 $7.9\~12.2\%$로 비교적 높게 나타나 변이가 컸던 것으로 나타났다. 2. 지역별 품종간에 미질 변이에서도 아밀로즈함량과 식미치에서 변이계수가 $2.6\~3.6\%$로 낮았으며, 완전미 비율과 단백질 함량은 $5.4\~7.2\%$로 다소 높았다. 3. 동일 품종에 대한 이앙시기에 따른 쌀의 품질 특성 변이에서는 연차간 및 품종에서와는 달리 단백질 함량의 변이계수가 2.2로 가장 낮았고, 아밀로즈 함량과 완전미 비율에서 $3.1\~3.7$로 다소 낮았지만, 식미치에서는 $5.8\%$로 다소 높아 같은 품종이라도 이앙시기에 따라 식미치의 변화는 큰 것으로 나타났다. 4. 지역간 미질의 변이는 품종 및 이앙기 이동에 따른 변이 보다는 오히려 연차간에 나타나는 변이가 더 크게 나타났으며, 이는 기상의 영향을 많이 받았기 때문인 것으로 사료되었다. 5. 동일 품종에 있어서 질소시비량에 따른 미질관련 형질의 변화와 변이에서는 이화학적 특성 중 아밀로즈 함량은 변이계수가 1.8로 질소질 비료의 영향을 거의 받지 않았던 것으로 나타났고, 질소질 비료를 증시함에 따라 미립내의 단백질 함량은 증가하여 변이계수가 4.4로 그 변이도 컸던 것으로 나타났다. 식미치 또한 단백질 함량과 같은 결과를 보였다. 쌀의 외관상 품위에 있어서는 질소질 비료의 증량에 따라 분상질미의 증가율이 가장 높았다. This study was carried out to improve the rice grain quality of Gyeoungbuk Province from 2002 to 2004. In variation of grain quality characteristics as the cultivation years were changed, the coefficient of variation (CV) of palatability and amylose content were relatively low as $3.9\~4.3\%$ and those of protein content and head rice rate were high as $7.9\~12.2\%$. Among the varieties, the tendency of variation was similar with cultivation years changing, CV of amylose content and palatability also low as $2.6\~3.6\%$ and those of head rice rate and protein content were high as $5.4\~7.2\%$. In variation as affected by shifting of transplanting times, the CV of protein content was low as 2.2, it was also relatively low in amylose content and head rice rate as $3.1\~3.7\%$, but it was high in palatability as $5.8\%$. As the nitrogen application levels were different the CV of amylase content was $1.8\%$ that it was not affected by the N levels. But in case of protein content, the CV was $4.4\%$ that the variation was somewhat increased, it suggested that as the N levels were increased the protein content was also increased. From these results, the rice quality characteristics showed the higher variation in the change of cultivation years than that in rice varieties, transplanting times or nitrogen levels.
LMC(Latex Modified Concrete)의 염소이온 확산 특성
박성기,원종필,박찬기,Park, Sung-Ki,Won, Jong-Pil,Park, Chan-Gi 한국농공학회 2008 한국농공학회논문집 Vol.50 No.4
It is most serious problem which is various occurs from the agricultural concrete structure and off shore concrete structure the problem which it comes to think is deterioration of the concrete which is caused with the corrosion of the reinforcing steel which is caused by with permeation of the water and the sea water. Specially the off shore concrete structure has been deteriorated by the steel reinforcement corrosion. The latex modified concrete(LMC) was adds latex in the plain concrete as the latex has increase the durability of concrete. This study were accomplished to the estimate the diffusion coefficient of LMC, and the time dependent constants of diffusion. The average chloride diffusion coefficient was estimated. Also, the average chloride diffusion coefficient was compared with diffusion coefficient test results of 28 curing days. The test results indicated that the average chloride diffusion coefficient could closely estimate the test results of the diffusion coefficient test results of 28 curing days.
배합변수에 따른 라텍스 개질 콘크리트 내에 정착된 보강철근의 부식개시시기 예측
박성기,원종필,박찬기,김종옥,Park, Seung-Ki,Won, Jong-Pil,Park, Chan-Gi,Kim, Jong-Ok 한국농공학회 2008 한국농공학회논문집 Vol.50 No.6
This study were predicted the corrosion threshold reached at steel reinforcement in latex modified concrete(LMC) which were applied the agricultural hydraulic concrete structures. Accelerated testing was accomplished to the evaluate the diffusion coefficient of LMC mix, and the time dependent constants of diffusion. Also, the average chloride diffusion coefficient was estimated. From the average chloride ion diffusion coefficient, the time which critical chloride contents at depth of reinforcement steel was estimated. Test results indicated that the corrosion threshold reached at reinforcement in LMC were effected on the mix proportion factor including cement contents, latex content, and water-cement ratio. Especially, the average chloride diffusion coefficient, the corrosion threshold reached at reinforcement in LMC were affected by the all mix proportion factor.
라텍스개질 콘크리트의(LMC)의 강도특성 및 배합인자 결정방법
박성기,원종필,박찬기,Park, Sung-Ki,Won, Jong-Pil,Park, Chan-Gi 한국농공학회 2008 한국농공학회논문집 Vol.50 No.5
This study are decided the mix proportion method of latex modified concrete for agricultural concrete structures from the results of workability and strength test with mix proportion factor. For mix proportion factor, this study are selected the water-cement ratio, unit cement amount and latex content. Also, this study were performed the slump, compressive strength test and microstructure analysis using the scanning electron microscope(SEM). The strength and slump of LMC are dependent with unit cement amount, latex content, and water-cement ratio. Especially, the strength of LMC are not controlled by single mix proportion factor but effected by combined mix proportion factor. Microstructure investigation are showed the LMC are reduced the internal pore volume and enhanced the transition zone between cement paste and aggregate interface. This effect get by consist of latex films in the concrete. Also, this study were recommended the mix proportion method for LMC. These mix proportions method are estimated the mix design for satisfied the target performance which are applied the agricultural concrete structure.