• Asian-Australasian Journal of Animal Sciences
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• 제21권11호
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• pp.1592-1598
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• 2008

An experiment was carried out to study the effect of cattle slurry on maize fodder (Zea mays) production. Maize fodder was produced at 4 cattle slurry levels $T_0$ (0 ton/ha), $T_1$ (10 ton/ha), $T_2$ (12 ton/ha) and $T_3$ (14 ton/ha) in a randomized block design. Agronomic characteristics, plant heights, circumference of stems, number of leaves, leaf area and dry matter yield of maize fodder were measured. Maize plant height and stem circumference were significantly (p<0.01) influenced by the increasing rate of cattle slurry at 15, 30, 45 and 56 days after sowing. Number of leaves of fodder plants was not significant but leaf area was significant (p<0.05) among the treatment groups. The highest biomass yield (p<0.01) of maize fodder was observed in $T_2$ (44.0 ton/ha). For crude protein content, a significant difference (p<0.01) was observed in the treatment groups and the highest value was observed in $T_2$ (11.99%). Organic matter content of maize fodder showed a significant difference but ash, ADF and NDF contents showed no significant differences among treatment groups. From this study it may be concluded that the application of 12 tons of cattle slurry/ha was optimal for production of biomass and nutrient content of maize fodder.

• 한국작물학회지
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• 제36권4호
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• pp.324-331
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• 1991

벼 침수직파재배법 확립을 위해 파종량과 산소 발생제 처리를 달리하여 침수토중직파재배 싱험을 실시한 결과를 요약하면 다음과 같다. 1 침수토중직파에서 CaO$_2$ 분의처리나 CaO$_2$와 규조토의 혼합 의처리는 입모율은 크게 향상 시켰으나 $m^2$당 개체수가 증가함에 따라 도복발생 정도가 심해져 수량증대에는 크게 기여하지 못했다 2. 침수토중직파에서 적정파종량과 1주 파종입수는 CaO$_2$ 분의처리에서는 3.3Kg종자/10a와 1주 3입파였고 산소발생제 무처리의 경우 5.6Kg 종자/10a와 1주 5입파였다. 3. 경로 계수 맥석의 결과에 의하면 수량에 대하여 등숙률의 직접 효과가 가장 커 도복 억제를 통한 등숙률의 향상이 침수 토중 직파 재배의 수량 증대에 가장 중요한 것으로 생각된다.

• 생물환경조절학회지
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• 제9권3호
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• pp.146-150
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• 2000

본 시험은 단고추 자루식 양액재배시 육묘일수에 따른 생육, 수량에 미치는 영향을 구명하고자 풋트당 2주로 하여 육묘일수 20일, 30일, 40일, 50일, 60일 처리구를 두고 재배를 요약하면 다음과 같다. 묘 소질은 육묘일수가 길수록 묘 생육이 좋았고 정식후 개화일 빨랐으나 평균 개화소요일수는 30일묘에서 48일로 가장 짧았고 다음으로 20일묘 순이었다. 뿌리활력은 20일과 30일묘에서 양호하였고 1차측근수는 30일묘가 1.5mm 이하 굵기의 뿌리수가 106.5개로 가장 많았으며 1차 측근장도 1,085cm로 가장 길었다. 정식후 생육은 엽중, 그중,경중 모두 30일묘에서 좋았으며, 수량은 수확초기에는 육묘일수가 긴 60일과 50일묘에서 수량이 많았으나 재배기간이 길어질수록 30일과 40일묘에서 수확량이 많았고 총수량도 많았다.

• 한국미생물·생명공학회지
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• 제19권5호
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• pp.444-449
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• 1991

Pullulanase의 역반응능을 이용하여 maltose와 $\beta$-cyclodextrin으로부터 maltosyl-$\beta$-cyclodextrin을 중합합성하기 위한 최적효소반응조건을 검토하였다. Maltose와 $\beta$-CD를 기질로 maltosyl-$\beta$-CD을 합성하였을 경우, 기질의 농도 70( w/w, 70g/100ml $H2_O$ ), malto-loigo당 /$\beta$-CD의 혼합비 12.7, 그리고 사용효소량 350 units/100ml일 때 최대전융인 43(w/w, g branched-CD/g CD)를 얻었고, 생성량은 2.31g/100ml였다. Maltosyl-$\beta$-CD의 효소합성의 적정 pH 및 온도는 각각 4.9와 $60^{\circ}C$ 였다. 또한 maltose와 $\alpha ,\beta$-그리고 $\gamma$-CD 각각을 기질로하여 maltosyl $\Alpha, \beta$ 그리고 $\gamma$-CD를 합성하였을 경우 전환율은 51.8, 42.6, 그리고 48.1로써, 생성량은 각각 2.8, 2.3 그리고 2.6g/100ml였다.

• Korean Chemical Engineering Research
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• 제49권6호
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• pp.732-738
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• 2011

고압 반응시스템에서 요소와 메탄올로부터 메틸카바메이트(MC) 및 디메틸카보네이트(DMC)의 제조에 관한 금속산화물촉매와 이온성액체의 영향을 고찰하였다. 고립계에서 요소와 메탄올로부터 MC 수율은 촉매를 사용하지 않고도 $150^{\circ}C$ 이상의 반응온도에서 거의 100%를 나타내었으나, DMC 수율은 반응온도와 무관하게 1.5% 이하로 매우 낮은값을 나타내었다. 또한 MC와 메탄올로부터 DMC 수율은 $ZnCl_{2}$ 촉매를 사용한 경우에 가장 우수하였으며, 최적조건에서 16.3% 정도를 나타내었다. DMC 수율은 반연속식 실험에서 나노 크기의 촉매와 이온성액체를 함께 적용한 경우에 좀 더 향상되었다.

• International journal of advanced smart convergence
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• 제7권1호
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• pp.42-47
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• 2018

Recently, as the demand for limited resources continues to rise and problems of resource depletion rise worldwide, the importance of renewable energy is gradually increasing. In order to solve these problems, various methods such as energy conservation and alternative energy development have been suggested, and biogas, which can utilize the gas produced from biomass as fuel, is also receiving attention as the next generation of innovative renewable energy. New and renewable energy using biogas is an energy production method that is expected to be possible in large scale because it can supply energy with high efficiency in compliance with energy supply method of recycling conventional resources. In order to more efficiently produce and manage these biogas, a biogas plant has emerged. In recent years, a large number of biogas plants have been installed and operated in various locations. Organic wastes corresponding to biogas production resources in a biogas plant exist in a wide variety of types, and each of the incoming raw materials is processed in different processes. Because such a process is required, the case where the biogas plant process is inefficiently operated is continuously occurring, and the economic cost consumed for the operation of the biogas production relative to the generated biogas production is further increased. In order to solve such problems, various attempts such as process analysis and feedback based on the feedstock have been continued but it is a passive method and very limited to operate a medium/large scale biogas plant. In this paper, we propose "CNN-based production yield prediction algorithm for increasing process efficiency of biogas plant" for efficient operation of biogas plant process. Based on CNN-based production yield forecasting, which is one of the deep-leaning technologies, it enables mechanical analysis of the process operation process and provides a solution for optimal process operation due to process-related accumulated data analyzed by the automated process.

• 한국초지조사료학회지
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• 제10권3호
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• pp.152-157
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• 1990

To find out the effect of different patterns of nitrogen and potassium distribution on dry matter yield and botanical composition of temperate pastures, a field experiment was conducted with 6 treatments replicated 3 times in a randomized complete block design. It was lasted from September, 1986 to October, 1989 at the Livestock Experiment Station in Suweon. The results obtained are summarized as follows: 1. In early spring, winter hardiness, growth vigour, cold damage and coverage of grasses with 30% dressing of the total amount of N and K20 fertilizer in spring and at the 4th cutting time respectively were better than those of the other treatments. 2. Average dry matter yield for 3 years with heavy dressing in spring and at the 1st cutting time(l1, 187 kg DM/ha) was much more increased by 9% than that of the equally fertilized treatment(l0,24lkg DM/ha). 3. Changes in the botanical composition showed, in general, the same tendency for all treatments except equal N and K20 distribution. However, grassland vegetation with heavy dressing in spring and at the 1st cutting time was changed into relatively good botanical composition with 76.7% grasses, 22.3% legumes and 1.0% herbs at the end of the experiment. 4. By DM yield and botanical composition treatment 3(40-30-15-0-1570) seemed to be an optimal nitrogen and potassium distribution pattern in a temperate pasture.

• Steel and Composite Structures
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• 제33권4호
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• pp.569-581
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• 2019

Corrugated steel plate shear wall (CSPSW) as an innovative lateral load resisting system provides various advantages in comparison with the flat steel plate shear wall, including remarkable in-plane and out-of-plane stiffnesses and stability, greater elastic shear buckling stress, increasing the amount of cumulative dissipated energy and maintaining efficiency even in large story drifts. Employment of low yield point (LYP) steel web plate in steel shear walls can dramatically improve their structural performance and prevent early stage instability of the panels. This paper presents a comprehensive structural performance assessment of corrugated low yield point steel plate shear walls having circular openings located in different positions. Accordingly, following experimental verification of CSPSW finite element models, several trapezoidally horizontal CSPSW (H-CSPSW) models having LYP steel web plates as well as circular openings (for ducts) perforated in various locations have been developed to explore their hysteresis behavior, cumulative dissipated energy, lateral stiffness, and ultimate strength under cyclic loading. Obtained results reveal that the rehabilitation of damaged steel shear walls using corrugated LYP steel web plate can enhance their structural performance. Furthermore, choosing a suitable location for the circular opening regarding the design purpose paves the way for the achievement of the shear wall's optimal performance.

• 농업생명과학연구
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• 제52권6호
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• pp.61-72
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• 2018

The aim of this present study was to investigate the impact of different seeding rate and nitrogen fertilizing levels on the seed yield and feed value of oats(Avena sativa L.) grown in Gyeongbuk area for two years. The experiment was arranged in split plot design with 3 main plots(100, 130 and 160 kg of seed/ha) and 4 subplots(0, 50, 70 and 90 kg N/ha), with 3 replicates. Heading, flowering, and maturing dates of oats sown in spring 2017, delayed by two days compared to that of spring 2016, and the plant height of spring 2017 were significantly shorter than that of spring 2016(18.1 ~ 23.4 cm). In addition, the highest number of stems and number of panicles according to different seeding rate and nitrogen fertilizing levels were achieved with the seeding rate of 160 kg/ha and 90 kg of N/ha in 2016 and 2017, respectively. In case of seed yield as affected by different seeding rate, the highest seed yield was achieved with a seeding rate of 130 kg/ha(p<0.05), and based on nitrogen fertilizing levels, the highest yield was obtained in 50 kg of N/ha compared to others. The crude fiber(CF), neutral detergent fiber(NDF) and total digestible nutrients(TDN) of oats cultivated and harvested in spring 2016 and 2017 according to different sowing rate were the highest in the seeding rate of 130 kg/ha. The crude protein(CP) content and total digestible nutrients(TDN) of 2016-2017 as influenced by nitrogen fertilizer levels were the highest in the nitrogen fertilizer level of 90 and 50 kg N/ha, respectively. In conclusion, the proper seeding rate and the optimal nitrogen fertilizing level in Gyeongju, Gyeongbuk province were considered to be the most appropriate in 130 kg/ha and 50 kg of N/ha, respectively.

• 한국작물학회지
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• 제68권4호
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• pp.313-326
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• 2023

Owing to adverse weather conditions, there is a heightened focus on actively researching the regulation of the sowing date in field crop cultivation. Soybean, a prominent field crop with extensive acreage and production, is a photophilic and thermophilic crop characterized by short-day photoperiodism. Identifying the optimal sowing time is crucial for mitigating the effects of severe weather conditions on soybean yield. Precise control over the timing of soybean sowing is the key to minimizing yield reduction due to unfavorable weather conditions. Temperature, photoperiod, and their interplay are the most significant factors influencing soybean cultivation among various weather factors. We conducted an experiment using three Korean soybean cultivars with varied maturities (Hwangkeumol: early maturing and Daewonkong and Pungsannamulkong: late maturing) in 2013 and 2014. Our investigation covered aspects of soybean growth, development, yield components, isoflavones, and visual seed quality. Across all three varieties, isoflavone levels increased with later sowing dates, while other measured components exhibited significant variations based on the sowing date. This study also provides valuable insights for the selection of suitable cultivars that perform well in soybean cultivation at various durations of maturity.