• 한국작물학회지
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• 제27권1호
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• pp.87-93
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• 1982

담배 황색종 품종인 SC72와 Hicks를 교배하여 그 $F_1$잡종식물의 약으로부터 유기한 반수체식물을 배가시켜 얻은 30계통의 10개 양적형질에 대한 변이, 유전력, 유전상관 및 경로계수의 분석에 의하여 각형질들의 유전현상을 본바 그 결과를 요약하면 다음과 같다. 1. 교배친간 각 형질의 변이폭은 1.5~37.8%인데 비하여 반수체배가계통간에는 19.6%~100.1%로 현저히 크게 나타났고 평균치에 있어서는 교배친에 비하여 반수체배가계통들은 nicotine, 수확엽수 및 엽장폭비가 증가하는 경향이나 그외 특성들은 저하되는 경향이었다. 2. 유전력은 개화일수 및 수확엽수는 높게, reducing sugar, kg당 가격 및 수량은 낮게, 그외 형질들은 중간치를 나타내었다. 3. 유전상관의 값은 표현형상관보다 그 값이 다소 높은 경향이었고, 수량은 kg당 가격, 엽폭, 수확엽수 및 reducing sugar와는 정의 상관이었고, nicotine은 엽장폭비를 제외한 타형질과는 부의 상관을 나타내었다. 4. 수량과 각형질간의 경로계수를 분석한 결과 수확엽수와 엽폭이 수량에 미치는 직접효과가 컸으며, 간접효과는 개화일수와 초장이 크게 나타났다.

• 환경정책연구
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• 제2권2호
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• pp.65-79
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• 2003

More than 145 million tons of liquid whey is produced world-wide as dairy processing waste per year, and half of it is discarded without proper treatment. Due to its high nutrient value, the environmental impact can be significant. Bioconversion of cheese whey can provide an effective way to reduce the waste and, at the same time, generate economically attractive value-added chemicals. In this study, cheese whey was fermented with P. acidipropionici to produce propionic acid which has a high market value for chemical and pharmaceutical industries. In order to specifically enhance propionic acid production, acetic acid production was suppressed using o-iodosobenzoic acid as an enzyme inhibitor. When grown in the presence of the inhibitor, propionic acid production rate increased by a factor of 2 while acetic acid production rate decreased by a factor of 3. Furthermore, when 0.3 mM of o-iodosobenzoic acid was used, the incipient stage(creeping growth period) was considerably reduced. Therefore, the inhibitor helps the cells begin to grow earlier and speed up the production of propionic acid. Although the production rate of propionic acid effectively increased, the final concentration(or production yield) remained unchanged due to product inhibition. Methods that can reduce product inhibition are being tested combined with o-iodosobenzoic acid to optimize both the production rate and yield. The results are expected to be informative for controlling the other byproducts for other applications.

• 한국산학기술학회논문지
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• 제16권3호
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• pp.1639-1644
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• 2015

볼밸브용 볼의 로봇 육성용접시스템에서 포지셔너의 설계 및 구조강도 해석에 관한 연구를 하였다. 포지셔너의 일부분인 터닝 유닛을 모델링하였고, 보로 가정하여 해석을 진행하였다. 볼의 무게가 $9,000kg_f$ 일 때 터닝 유닛에 가해지는 응력이 366.85MPa로 나왔다. 이 값은 재료의 항복강도보다 높은 값이다. 앞의 결과를 토대로 터닝 유닛을 수정하여 모델링을 하였다. 수정된 모델링으로 해석한 결과, 응력의 값은 296.11MPa로 확인되었다. 이 값은 재료의 항복강도보다 낮은 수치이며, 볼의 무게를 버티는 것을 알 수 있었다.

• 약학회지
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• 제34권5호
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• pp.302-310
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• 1990

A study has been made of the Korean bentonite aqueous suspension contrast with American bentonite by means of XRD IR swelling, gel formation and rheogram at various conditions such as concentration, temperature and pH. The Korean bentonite was identified as montmorillonite clay containig a small proprotion of crystoballite and mordenite, and its swelling power were acceptable for requirements of Korean pharmacopeia regulations though its values were not satisfied. Korean bentonite swelled to 10 times and American one did to 15 times compared to its bulkiness of powder. The rheogram of Korean bentonite suspension reveals bulged pseudoplatic flow with yield value at higher concentration and pseudoplastic flow without yield value at lower concentration. The higher the concentration, the greater were the apparent viscosity and hysteresis loop. Korean bentonite suspension showed insignificant temperature dependence on both apparent viscosity and hysteresis loop and it was more temperature dependent on viscosity but less on hysteresis loop than those of American sample. The pH dependence was so high on viscosity that apparent minimum value was near pH 7 and maximum value at pH 3 or 7. The hysteresis loop appeared minimum over the pH range 5-7 and maximum near pH 3 or 11. The Korean bentonite was inferior to the American bentonite in swelling volume, gel formation, thioxotropy, however, it would be possible to improve the quality of Korean bentonite by developing the method of purification for bentonite clay.

• 한국조리학회지
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• 제14권2호
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• pp.273-285
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• 2008

The purpose of this study was to find appropriate processing condition of astringent persimmon and persimmon leaf granular tea. Under the condition of 4 hour extraction and $50^{\circ}brix$, extraction yield and concentrating of astringent persimmon were the greatest. Under the condition of 2 hour extraction and $7^{\circ}brix$, extraction yield and concentrating of persimmon leaf were the greatest. The optimum condition of granular tea with astringent persimmon and persimmon leaf added was the best in astringent persimmon concentrate of 16% and persimmon leaf concentrate of 4%. It had the best taste after the condition in a brix value of 16.15% and a pH of 5.57. The L-value of chromaticity was -79.13, a-value 2.27, and b-value 2.41. In the sensory properties correlation analysis of astringent persimmon and persimmon leaf granular tea, sweet taste, color acceptability, odor acceptability and taste accept-ability were positively significant correlation with most sensory properties. However, astringent taste was no significant correlation with sensory acceptability. Bitter taste and after taste were negatively significant correlation with most sensory properties.

• 한국농림기상학회지
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• 제25권3호
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• pp.172-181
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• 2023

국내 조사료 자급률을 높이고 양질의 동계 조사료를 생산하기 위하여 청우밀을 대상으로 출수기 후 생육 단계별로 조사료 생산성과 사료가치 등을 분석하여 적정수확시기를 살펴보았다. 청우밀의 생육단계별 지상부 생산량은 출수 후 30일까지 증가하고 그 이후에는 감소하였다. 지상부에서 이삭이 차지하는 비율은 출수 후 30일까지는 40% 이하로 낮았지만 그 이후에는 60% 이상으로 증가하였다. 그리고 출수 후 30일에 청우밀 지상부의 단백질 함량과 상대적 사료가치(RFV)가 최고점에 달하는 반면 산성세제불용섬유소(ADF)와 중성세제불용섬유소(NDF)는 낮았다. 또한 청우밀 지상부의 무기질 성분들이 반추가축이 필요로 하는 적정기준 범위 내에 있거나 최대 허용 수준을 초과하지 않았다. 따라서 반추가축의 조사료로 활용하기 위한 청우밀의 수확시기는 조사료 생산성, 사료가치 등을 고려하였을 때 출수 후 30일 전후가 적절한 것으로 판단된다. 그리고 출수 후 30일에 조사료를 수확하면 시기적으로 2모작 작부체계 시 후작인 벼의 이앙이나 밭작물 파종에도 유리할 것으로 나타났다.

• Asian-Australasian Journal of Animal Sciences
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• 제19권7호
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• pp.915-921
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• 2006

Various random regression models with different order of Legendre polynomials for permanent environmental and genetic effects were constructed to predict future milk yield of Holstein cows in Korea. A total of 257,908 test-day (TD) milk yield records from a total of 28,135 cows belonging to 1,090 herds were considered for estimating (co)variance of the random covariate coefficients using an expectation-maximization REML algorithm in an animal mixed model. The variances did not change much between the models, having different order of Legendre polynomial, but a decreasing trend was observed with increase in the order of Legendre polynomial in the model. The R-squared value of the model increased and the residual variance reduced with the increase in order of Legendre polynomial in the model. Therefore, a model with $5^{th}$ order of Legendre polynomial was considered for predicting future milk yield. For predicting the future milk yield of cows, 132,771 TD records from 28,135 cows were randomly selected from the above data by way of preceding partial TD record, and then future milk yields were estimated using incomplete records from each cow randomly retained. Results suggested that we could predict the next four months milk yield with an error deviation of 4 kg. The correlation of more than 70% between predicted and observed values was estimated for the next four months milk yield. Even using only 3 TD records of some cows, the average milk yield of Korean Holstein cows would be predicted with high accuracy if compared with observed milk yield. Persistency of each cow was estimated which might be useful for selecting the cows with higher persistency. The results of the present study suggested the use of a $5^{th}$ order Legendre polynomial to predict the future milk yield of each cow.

• 한국유기농업학회지
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• 제27권2호
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• pp.225-235
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• 2019

The present study hypothesized that ratio between carcass traits components could be applied for the understanding of yield index in Hanwoo steer. A thousand data was generated based on average carcass weight (CW), loin area (LA) and backfat thickness (BT) of Hanwoo steer in December 2018 for analysis 1. Then yield index (YI) was calculated using newly established yield index equation. The correlation between yield index and each carcass traits was visualized. In the interaction between carcass traits components (LA, CW, BT) and YI, only the interactions including BT showed a regular pattern to YI. Then changes of YI according to ratio of carcass traits components were investigated. The observed interactions between LABT and CWBT were similar with Monod equation model. The changes of YI to LABT and CWBT were fitted to Monod equation, and yield constants (K1 for LABT; K2, CWBT) of each equation were calculated as 0.47 and 2.20, respectively. Carcass traits from 5 commercial Hanwoo steer farm were then employed in the second analysis. Yield constants of each farm were estimated. In estimation, R² value for K1 (LABT) showed greater than the K2 (CWBT). Finally, each farm was plotted based on their K1 and K2 values and it was found that greater yield index of Hanwoo steer was found as increased K1 and K2. As conclusion, the present study suggested the possibility of K1 and K2 values for understanding of yield grade equation and their application in the evaluation of new model for yield grade estimation and feeding strategy.

• 드라이브 ㆍ 컨트롤
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• 제21권2호
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• pp.36-43
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• 2024

The yield is basic and necessary information in precision agriculture that reduces input resources and enhances productivity. Yield information is important because it can be used to set up farming plans and evaluate farming results. Yield monitoring systems are commercialized in the United States and Japan but not in Korea. Therefore, such a system must be developed. This study was conducted to develop a yield monitoring system that improved performance by correcting a previously developed flow sensor using a grain tank-weighing system. An impact-plated type flow sensor was installed in a grain tank where grains are placed, and grain tank-weighing sensors were installed under the grain tank to estimate the weight of the grain inside the tank. The grain flow rate and grain weight prediction models showed high correlations, with coefficient of determinations (R2) of 0.9979 and 0.9991, respectively. A main controller of the yield monitoring system that calculated the real-time yield using a sensor output value was also developed and installed in a combine harvester. Field tests of the combine harvester yield monitoring system were conducted in a rice paddy field. The developed yield monitoring system showed high accuracy with an error of 0.13%. Therefore, the newly developed yield monitoring system can be used to predict grain weight with high accuracy.

• 한국작물학회지
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• 제53권spc호
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• pp.15-18
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• 2008

2007년도 성숙기 때 대구 지역에서 장기 강우로 발생한 운광벼 및 고품벼 수발아 종자에 대하여 수량 및 품질을 분석시험을 수행하였다. 수발아 종자의 수량 형질은 현미 천립중은 정상종자 운광벼와 고품벼가 각각 22.1 g과 20.9 g 인데 비해 수발아 종자는 각각 0.6 g과 0.5 g 더 적었으며, 현백 비율은 정상종자 운광벼가 89.2%, 고품벼 87.1%에 비해 각각 3.2%와 6.2% 낮은 86.0%와 80.9%였으며, 수량은 정상종자에 비해 운광벼는 5%, 고품벼는 7% 감수되었다. 식미와 관련 높은 최고점도는 정상종자 운광벼가 3,288, 고품벼가 3,122였는데 비해 수발아 종자는 각각 3,127과 2,149로 낮아 품질이 떨어졌다. 치반점도는 운광벼, 고품벼 모두 정상종자에 비해 수발아 종자가 더 낮았고 경도는 오히려 높아 품질을 크게 떨어 드렸으며, 색차는 고품벼에서 a값이 정상종자는 1.65인데 비해 수발아 종자는 0.90으로 더 낮아색깔이 변하였다