• 한국작물학회지
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• 제51권5호
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• pp.445-450
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• 2006

본 연구에서는 질소 시비수준이 생육시기별 식물체 및 종실에서 isoflavone함량에 미치는 영향을 구명하기 위하여 고속액체크로마토그래피(HPLC)를 이용하여 생육시기에 따른 식물체에서 isoflavone을 분석한 결과를 요약하면 다음과 같다. 1. 질소시비 수준에 따른 일반생육은 50%증비구가 다른 처리에 비하여 가장 좋았는데, 엽수 및 엽면적이 표준비의 72.7개, $619.7cm^{2}$에 비하여 81.9개와 $723cm^{2}$으로 증가하였다. 2. 수량 관련 형질 중에서 협수 및 종실수는 50%증비에서 개체당 31.9개와 72.3개로 가장 많았으며, 수량도 246 kg/10a로 다른 시비구에 비하여 가장 높았다. 무비와 N무비구에서는 협수가 24.9개/개체와 25.1개/개체, 립수는 60.3개/개체과 51.1개/개체, 수량은 181.0 kg/10a과 178.0 kg/10a으로 낮았다. 3. 생육시기에 따른 isoflavone 함량은 잎, 줄기, 뿌리에서 개화이후부터 립비대기(R5)까지는 감소하다가 이후 수확기(R7)까지 다시 증가하였다. 4. 식물체 부위별 isoflavone 함량은 뿌리에서 가장 높은 값을 나타내었다. 5. 시비수준에 따른 종실의 isoflavone 함량은 무비, N무비 및 50% 감비의 경우가 표준비나 증비보다 다소 높은 함량을 나타내었다.

• 한국균학회지
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• 제1권2호
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• pp.1-7
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• 1973

양송이 수량을 지배하는 여러인자중에서 퇴비의 전질소 함량과 암모니아 잔류량이 양송이 수량에 미치는 영향을 구명하고자 본시험을 실시한 결과 다음과 같은 결론을 얻었다. 1. 퇴비의 전질소 함량과 양송이 수량간에는 y=1395+0.048x$(r=0.68^{**})$의 관계가 있었으며 전질소 함량이 높을수록 암모니아 잔류량도 증가하는 경향이었다. 2. 유기태급원은 무처리나 무기태급원에 비해 퇴비의 전질소가 증가되었으며 수량도 높았다. 3. 퇴비의 암모니아 잔류량과 양송이 수량간에는 $y=0.38086-0.011948x+0.00012x^2(r=-0.75^{**})$의 관계가 있었으며 안전다수확을 위해서는 0.03%(질소함량으로서)를 넘지 않아야 했다. 4. 유안의 사용은 암모니아 잔류량이 높았으며 양송이 수량이 낮은 반면 요소는 그 잔류량이 낮고 수량이 유안에 비해 현저히 높았다.

• 한국작물학회지
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• 제49권1호
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• pp.41-45
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• 2004

We have developed and tested a new method for nondestructive estimation of chlorophyll- and nitrogen-contents in rye leaf. It was found that the relation-ships among nitrogen, chlorophyll content and fresh weight were significantly positive correlated. Nitrogen and chlorophyll content were positively correlated whereas correlation coefficients among R, G, R-B and G-B on the basis of photo-numerical values were negative. We have found that R/(R-B) obtained from data of digital camera is the best criterion to estimate the chlorophyll content of leaves. The regression curves of the relation between R/(R-B) and chlorophyll content were also calculated from the data collected on cloudy days. The coefficients of determination ($\textrm{r}^2$) were ranged from 0.33 to 0.99. In this study, the accuracy in estimating chlorophyll content from the color data of digital camera image could be improved by correcting with R, G, and B values. It is suggested that, for practical purposes, the image values estimated with sufficient accuracy using a portable digital camera can be applied for determining chlorophyll content and nitrogen status in plant leaves.

• 한국연초학회지
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• 제1권2호
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• pp.120-126
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• 1979

목포, 남원, 예산지방에서 각각 재배한 Burley 엽중의 nitroate form nitrogen, alkaloid form nitrogen, ammonia form nitrogen, protein form nitrogen과 form nitrogen의 함량을 조사하였다. Total nitrogen 중에서 protein form nitrogen이 차지하는 비율이 30-33%로써 가장 높았고, nitrate form nitrogen이 10∼23%, alkaloid form nitrogen이 8∼16%, ammonia form nitrogen이 6∼9%, 그리고 amide form nitrogen이 2∼2%였다. Nitrate form nitrogen의 함량 비율은 예산, 남원, 목포 순으로 증가하는데 반하여 alkaloid form nitrogen은 반대되는 현상을 보였다. 등급에 따라서는 alkaloid form nitrogen과 ammonia form nitrogen의 함량 비율의 순위는 H5>3>L1>3>5이였으며 nitrate form nitrogen은 이와 반대되는 경향이었다.

• Journal of Welding and Joining
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• 제18권1호
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• pp.59-69
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• 2000

The purpose of the present study was to investigate weld metallurgical phenomena such as primary solidification mode, microstructural evolution and hot cracking susceptibility in nitrogen-bearing austenitic stainless steel GTA welds. Eight experimental heats varying nitrogen content from 0.007 to 0.23 wt.% were used in this study. Autogenous GTA welding was performed on weld coupons and the primary solidification mode and their microstructural characteristics were investigated from the fusion welds. Varestraint test was employed to evaluate the solidification cracking susceptibility of the heats and TCL(Total Crack Length) was used as cracking susceptibility index. The solidification mode shifted from primary ferrite to primary austenite with an increase in nitrogen content. Retained delta ferrite exhibited a variety of morphology as nitrogen content varied. The weld fusion zone exhibited duplex structure(austenite+ferrite) at nitrogen contents less than 0.10 wt.% but fully austenitic structure at nitrogen contents more than 0.20 wt.%. The weld fusion zone in alloys with about 0.15 wt.% nitrogen experienced primary austenite + primary ferrite solidification (mode AF) and contained delta ferrite less than 1% at room temperature. Regarding to solidification cracking susceptibility, the welds with fully austenitic structure exhibited high cracking susceptibility while those with duplex structure low susceptibility. The cracking susceptibility increased slowly with an increase in nitrogen content up to 0.20 wt.% but sharply as nitrogen content exceeded 0.20 wt.%, which was attributed to solidification mode shift fro primary ferrite to primary austenite single phase solidification.

• 한국작물학회지
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• 제45권2호
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• pp.128-133
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• 2000

This study was carried out to investigate the effect of forms and levels of nitrogen fertilizer on plant growth and essential oil production of Agastache rugosa. Calcium nitrate had more influenced on length and width of leaves and lateral branch length than did urea. When nitrogen fertilizer level was increased from 12 kgN/I0a to 24kgN/I0a, plant growth was stimulated and dry matter of leaf and inflorescence were increased. Top dry matter of plant with calcium nitrate treatment (38.4 g) was heavier than that of urea treatment (32.8 g). Interactions among accession and nitrogen form and nitrogen rate were not significantly different for top dry matter. The forms and rate of nitrogen fertilizer did not affect estragole content. The estragole contents was higher in leaf (91.8%) than that of inflorescence (81.3%). While the essential oil content was not affected by different nitrogen forms, nitrogen level affected the essential oil contents positively by increasing dry matter. Essential oil yield was not affected by accession or nitrogen form, but by nitrogen rate. With increasing N application from 12kgN/I0a to 24 kgN/I0a, essential oil yield was increased by 95.8 %.

• 한국전기전자재료학회논문지
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• 제36권4호
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• pp.376-384
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• 2023

Nitrogen-doped graphene was synthesized by a hydrothermal method using graphene oxide (GO) as the raw material, urea as the reducing agent and nitrogen as the dopant. The morphology, structure, composition and electrochemical properties of the samples are characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), nitrogen adsorption-desorption analysis, electrical conductivity and electrochemical tests. The results show that urea can effectively reduce GO and achieve nitrogen doping under the hydrothermal conditions. By adjusting the mass ratio of raw materials to dopants, the graphene with different nitrogen doping contents can be obtained; the nitrogen content range is from 5.28~6.08% (atomic fraction percentage).When the ratio of dopant to urea is 1:30, the nitrogen doping content reaches a maximum of 6.08%.The supercapacitor performance test shows that the nitrogen content prepared by the ratio of 6.08% is the best at 0.1 A·g^-1. The specific capacitance is 95.2 F·g^-1.

• 한국초지조사료학회지
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• 제42권3호
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• pp.176-182
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• 2022

The aim of this study was to investigate dry matter productivity and nitrate nitrogen content in the growth stages of barnyard millet (Echinochloa esculenta) cultivated for feed, which was treated with different nitrogen fertilization levels. An early variety of barnyard millet (cv. Shirohie) was used for the test, and the different treatments with nitrogen fertilizer were as follows: 50% (N-40 kg/ha, T1), 100% (N-80 kg/ha, reference amount, T2), 150% (N-120 kg/ha, T3), 200% (N- 160 kg/ha, T4), 250% (N-200 kg/ha, T5), and 300% (N-240 kg/ha, T6). Sowing was done on May 13, 2021 and plants were harvested for four stage; vegetative stage, elongation stage, heading stage, and milk stage. The length of the millet increased significantly as the amount of nitrogen fertilization increased during the harvest period (p<0.05), but the difference was insignificant during the milk stage (p>0.05). Moreover, barnyard millet dry matter yield increased significantly as the levels of nitrogen fertilization increased (p<0.05), but there was no significant difference in dry matter yield among nitrogen fertilization levels during the heading stage (p>0.05). Chlorophyll also was significantly higher in T5 (250%) at all harvesting times, whereas nitrate nitrogen content was highest at the vegetative stage, gradually decreased as growth progressed, and lowest at the milk stage. Finally, as the nitrogen fertilization levels increased, the nitrate nitrogen content was significantly higher in all treatment groups (p<0.05). Therefore, our results suggest that the most appropriate nitrogen fertilizer levels is between 150%-200%, considering the dry matter yield, feed ingredients and nitrate nitrogen content in barnyard millet for feed.

• 한국근적외분광분석학회:학술대회논문집
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• 한국근적외분광분석학회 2001년도 NIR-2001
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• pp.1262-1262
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• 2001

The rice plant is one of the important staple crops in Korea. The high yield with low cost in rice is required the soil fertility and the development of new precise method of fertilizer application by nutritional diagnosis. Now, in Korea, the nitrogen application system for the rice plant is composed of the basal fertilization, fertilization at tillering stage and fertilization at panicle stage, which the nitrogen fertilization at panicle stage amount to about 30 percent in the total amount. Thus, this experiment carried out to the development of the system that can measure the nitrogen content in the rice plant at panicle stage rapidly with the near infrared spectroscopy, and to predict the appropriate quantity of the nitrogen fertilization at panicle stage based on calibration model for test of nitrogen content in rice plant. The samples were collected from 48 varieties in 4 regions which are mainly cultivated in the southern part of Korea. And then, it collected by classifying into the leaf, the whole plant and the stem since 7 days before the nitrogen fertilization at panicle stage. The ranges of the nitrogen contents were 1.6∼4.0%, 1.7∼3.0% and 1.4∼2.7% in the leaf, the whole plant and the stem, respectively. In the calibration models created by each part of the plant under the Multiple Linear Regression(MLR) method, the calibration model for the leaf recorded the relatively high accuracy. The mutual crossing test on unknown samples were carried out using Partial Least Square(PLS) calibration model. That is, the nitrogen content in the stem was tested by calibration model made by the leaf model and that of stem was tested by calibration model made by whole plant sample. When unknown leaf sample was tested by calibration model made by all sample that collected from each part in rice plant such as leaf, stem and whole plant, it recorded the highest accuracy. As a result, to test the nitrogen content in the rice plant at panicle stage, the nitrogen content in the leaf shall be tested by the calibration model composed of the leaf, the stem and the whole plant. In future, to estimated the amount of nitrogen fertilization at panicle stage for rice plant , it will be calculated based on regression model between rice yield and nitrogen content of leaf measured by calibration model made by mixed sample including leaf, stem and whole plant.

• 한국식품영양학회지
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• 제32권4호
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• pp.342-348
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• 2019

The objective of this study was to investigate the changes in flavor components of cheonggugjang prepared with hazelnut. Amino nitrogen content in cheonggukjang was significantly lower in the 30~40% hazelnut group compared to the control group. The volatile basic nitrogen of hazelnut added cheongkukjang showed a similar pattern to that of amino nitrogen. The number of B. subtilis was slightly increased in relation to the amount of hazelnut added, but there was no significant difference. The content of glucose increased proportionally with increasing hazelnut. Total amino acid content decreased with increasing hazelnut. The ratio of glutamic acid to total free amino acids increased with increasing hazelnut. Oleic acid content increased proportionally with increasing hazelnut, while linoleic acid content decreased. In conclusion, the addition of hazelnut may contribute to the quality diversification of cheonggukjang by changing the taste and flavor while maintaining the amino nitrogen content of cheonggukjang.