• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 2001.11a
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• pp.178-180
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• 2001

작물의 엽면적 등 다양한 생육정보를 간편하고 비파괴적으로 추정할 수 있다면 작물의 생리 생태학적 모델에의 적용을 통하여 다양한 작물 연구에 중요한 공헌을 할 수 있다. 본 연구에서는 오이 개개 잎의 형태정보를 이용하여 오이의 개개 엽면적, 생체중 및 건물중 예측하는 것을 목적으로 하였고, 이를 위하여 엽면적은 5가지 모델을 사용하였고, 생체중 및 건물중은 6가지의 모델을 사용하여 분석하였다. 또한 신경회로망은 3 layer의 back propagation method를 사용하여 분석하였다. 각 모델들은 독립변수로는 Robinson ＆ Pharr이 사용한 개개 잎의 폭 및 길이를 사용하였다. 회귀모델에 의한 추정 결과, 모델의 정확성 및 정밀성은 엽면적 > 생체중 > 건물중 순 이었지만, 특히 건물중의 경우는 상대적으로 낮은 상관관계를 가지는 것으로 나타났다. 회귀모델을 사용하여 건물중 추정하는 것에는 한계가 있는 것으로 생각되며, 신경회로망도 이와 유사한 관계를 나타냈지만 다양한 변수 수정을 통하여 상관계수를 증가시킬 수 있을 것이라고 생각된다.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.40 no.3
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• pp.340-350
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• 1995

This study was conducted to obtain the basic information for the salt stress of Italian Ryegrass. Fourteen cultivars including 7 diploid and 7 tetraploid were subjected to eight levels of NaCl treatments during germination and early seedling stages. Germination percentage decreased remarkably over 300mM of NaCl concentration. The NaCl concentration that inhibited germination of 50% of the viable seeds in the cultivars was 344mM. The decreasing degree of germination percentage was higher in tetraploid type than in diploid type. The varietal difference of germination percentage was shown to be very conspicuous as the NaCl concentration increased. Top dry weight in 166 mM NaCl was decreased by 50% compared with that of control. Inhibition of NaCl appeared to be more in early seedling stage than in germination stage. Top dry weight of cultivars in NaCl stress was not related with germination capacity. Root dry weight in 148mM NaCl decreased by 50% compared with that of control. Root dry weight of cultivars was significantly correlated with top dry weight in NaCl treatment. Top dry weight and root dry weight was higher in diploid type than in tetraploid type at each 8 levels of NaCl concentration. Total chlorophyll content increased with the increase of NaCl concentration and the degree of increase in chlorophyll a was higher than that in chlorophyll b. Chlorophyll a was higher in tetraploid type than in diploid type. But chlorophyll b was higher in diploid type than in tetraploid type. There were significant correlation between chlorophyll a and top dry weight of cultivars over 150mM of NaCl concentration. Free proline content accumulated remarkably in NaCl treatment compared with control and was not difference between diploid type and tetraploid type. Free proline content of cultivars was not related with top dry weight in NaCl treatment.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.63 no.3
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• pp.186-195
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• 2018

A field study was conducted over a 3-year period from 2014 to 2016 in the central plain area, Suwon, Korea, 1) to compare the biomass production between machine-transplanted and water-broadcast seeded silage rice and 2) to elucidate the growth factors that affect the difference in biomass production between the two cultivation practices. The heading date for the water-broadcast seeded silage rice was September 11-18, which was delayed by 11-17 days when compared to that for the machine-transplanted silage rice. On average, water-broadcast seeded silage rice had a shorter plant height, more panicles per area, and a greater biomass production because of the increased straw dry weight. However, the difference in dry weight of each plant organ between the two cultivation practices exhibited yearly variation. When the data were pooled across experimental years, cultivation practices, and varieties, biomass production was highly positively correlated with straw dry weight but not with panicle dry weight. When the ratio of water-broadcast seeding to machine-transplanting was analyzed, total dry weight and straw dry weight were positively associated with each other, whereas no relationship was found between total dry weight and panicle dry weight. Despite that water-broadcast seeded silage rice produced more panicles per area than machine-transplanted silage rice, the two cultivation practices had a similar dry weight per culm. Therefore, we conclude that the silage rice from the water-broadcast seeding, compared to the machine-transplanting, produced more biomass because of the combination of the increased panicle number per area and a similar dry weight per culm. These results suggest that silage rice could be produced through water-broadcast seeding to increase biomass production with low labor and cost input.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.35 no.4
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• pp.328-333
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• 1990

In developing dynamic growth model of a crop, it is important to estimate accurate dry matter partition to different parts of crop plants. Two rice varieties, Samkang and Chucheong, were transnplanted with three planting densities of 72. 90 and 120 hills per 3.3㎡ on May 30 and June 15 in 1988 to study the effect of planting density on dry matter partition in rice plants. Total dry wight per square meter of two varieteis in May 30 transplanting were greater than those in June 15 transplanting. Total dry wights were increased as planting density was increased. The response of dry weights of differents parts of rice plants per hill were decreased as the density was increased. Although the difference in dry weights of leaf blade and stem and sheath between two varieties was not great, greater ear weight of Samkang resulted in greater total dry weight than that of Chucheong. Despite of transplant in date and planting density on dry weights, the ratio of dry matter partition to different parts of rice plants at a certain growth stage remained constant. Estimated dry weights of different parts at two stages of growth based on average ratio of dry matter partition over two transplantion dates and planting densities agreed well with those observed.

• Korean Journal of Plant Resources
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• v.14 no.2
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• pp.108-115
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• 2001

For determining the effect of extracts exudated from ten industrial plant resources on germination and early growth of shoot and root of radish the allelopathic compounds screened. Germination rate and seedling growth of radish differed depending on plant species and extract concentration. Lower levels of 1% extracts exudated from industrial plant resources promoted the rate of germination of radish while higher levels of 10% extract inhibited the rate of germination. Germination rate, shoot growth and root growth of radish in higher concentration of extract also differed depending on the plant species exudated and extract concentraton of industrial plant resources. Higher concentration of extracts from Xanthium strutnarium L. Angellica gigas Nakai, and Solanum nigrum L. were completely inhibited the germination while those from Cichorium intybus L., and Polygonatum officinale Allioni were not inhibited. Extracts exudated from Xanthium strutnarium L, Angellica gigas Nakai, and Solanum nigrum L. showed the strong inhibition of shoot and root growth of radish while those from Cichorium intybus L., and Polygonatum officinale Allioni did not show the bioactivity in shoot and root growth of radish..

• Proceedings of the KSRS Conference
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• 2009.03a
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• pp.40-45
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• 2009

본 연구에서는 기후 등의 영향을 받지 않고 레이더 산란 측정을 할 수 있는 X-band antenna 기반의 자동관측 시스템을 이용하여 벼 생육시기에 따른 후방산란계수와 벼 생육인자와의 관계를 분석하여 후방산란계수를 이용한 벼 생육인자를 추정한 것을 목적으로 하였다. 2008년도 국립농업과학원 시험포장 ($37^{\circ}$15'28.0"N, $126^{\circ}$59'21.5"E)에서 추청벼를 대상으로 생육시기별 후방산란계수를 관측하였는데 모든 편파별 후방산란계수가 벼 유수형성기 (7월 말경)까지 증가하다가 그 후 감소하다가 수확기가 가까워지는 9월 중순이후 다시 증가하는 dual-peak 현상을 보였고 특히 W-편파의 경우 9월 초순부터 후방산란계수 증가가 다른 polarization에 비해 크게 나타났다. 후방산란계수와 작물생육인자와의 관계를 분석한 결과 고주파수인 X-band는 상대적으로 바이오메스, 엽 면적지수와의 상관이 낮게 나타났지만 이삭 건물중은 VV-편파 후방산란계수와 상관관계를 보였다. 이삭 건물중과 상관관계가 높게 나타난 X-band의 W-편파 후방산란계수를 이용하여 수확기 이삭 건물중을 추정하였는데 VV-편파 후방산란계수와 이삭 건물중과는 결정계수 $(R^2)$가 0.85이었고, 이삭 건물중 실측값과 추정값을 비교해 본 결과 1:1 line에 근접하게 분포하였다 ($R^2$=0.85).

• Bulletin of Food Technology
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• v.15 no.2
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• pp.76-84
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• 2002

일부 야생 및 배양 버섯중의 sterol 및 vitamin $D_2함량을 측정하였다. 야생버섯의 부위별 이들 성분의 분포 또한 평가되었다. 또 야생버섯의 자실체의 vitamin $D_2함량의 변화도 연구되었다. vitamin $D_2는 비누화 및 반예비 순상 HPLC 정제를 포함하는 방법을 사용한 후 HPLC법을 사용하여 측정하였는데, 내부 표준품을 이용한 분석용 역상컬럼을 이용한 정량을 하였다. Sterol 함량은 GC로 분석되었으며, 내부표준품을 사용하였다. 비누화 후에 sterol을 trimethylsily1 ester로 유도체화하여 분석의 시료로 하였다. 질량분석이 sterol류의 동정을 확인하기 위하여 사용되었다. 배양 버섯에서는 vitamin $D_2는 거의 존재하지 않았으나, 일부 야생 버섯은 이들 vitamin을 다량(4.7- 194$\mug$/ 100g 건물중) 함유하고 있었다. Ergosterol은 버섯류 중에 가장 많이 존재하는 sterol이었으며, 야생버섯류(296-489 mg/ 100g 건물중)보다 배양버섯류(602.1-678.6 mg/ 100g 건물중)에서 높은 함량을 보였다. Vitamin D2와 ergosterol의 함량은 버섯류의 부위에 따라 아주 다양하거나 적당한 변화를 보였으며, 자루부위에서 가장 낮은 함량을 보였다. 더욱이 개체별 자실체간의 vitamin $D_2함량간에도 많은 차이를 보였다.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.47 no.6
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• pp.486-491
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• 2002

Spikelet number and its components of rice plant are closely associated with nitrogen accumulation and biomass production during panicle formation stage. To elucidate this relationship and also compare the differences of the sink formation efficiency among cultivars, spikelet number, its components, nitrogen content, nonstructural carbohydrate content, and plant dry matter were investigated under 5 nitrogen levels with two split application methods and shading treatments by using three rice varieties. The nitrogen amount in shoot at panicle initiation stage and at 15 days after panicle initiation showed significant positive correlation with primary rachis branches per square meter, and that at 15 days after panicle initiation and at heading stage with secondary rachis branches per square meter, Primary and secondary rachis branches per square meter showed positive significant correlation with the shoot dry weight at panicle initiation stage and at 15 days after panicle initiation stage, respectively, The amount of degenerated secondary rachis branches and spikelets per square meter showed significant negative correlation with the dry weight and nonstructural carbohydrate increase of stem during 15days after panicle initiation, and the contents of nonstructural carbohydrate at 15 days after panicle initiation. Spikelets per unit area showed significant positive correlation with nitrogen amount in shoot and shoot dry weight at heading stage. The sink formation efficiency expressed as the spikelet number produced by the unit amount of nitrogen in shoot at heading stage was higher in Nampoongbyeo than Choocheongbyeo and Hwaseongbyeo. Sink formation efficiency was negatively correlated with the dry weight increase of shoot and stem during reproductive stage. but not significantly with that of leaf in all varieties. Sink formation efficiency was not significantly correlated with nonstructural carbohydrate, but was significantly negatively correlated with structural carbohydrate increase during reproductive stage.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2010.04a
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• pp.263-266
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• 2010

비정형 형상의 초고층 건물이 증가함에 따라, 설계 시공 계획 단계에서의 시공 중 건물의 구조적 안정성 검토가 핵심 사항으로 부각되고 있다. 시공 중 비정형 초고층 건물의 안정성을 확보하기 위해서는, 횡력저항시스템이 완전히 형성되기 전 구조체 자중의 불균형 분포에 의해 발생하는 수직부재의 불균등 축소, 골조의 기울어짐 혹은 횡변위 등이 시공단계해석에 의하여 검토되어야 하며, 시공단계해석은 구조건전성모니터링, 시공 보정 프로그램, 시공계획 수립 등과 체계적으로 결합되어 진행되어야 한다. 이 논문은 시공 중 비정형 초고층 건물의 구조 안정성 검토를 위하여, 실제 비정형 초고층 프로젝트에 시공단계해석을 적용하였으며, 시공 중 초고층 건물의 안정성 확보를 위한 주요 검토 항목 및 방법을 제시하였다.

• Computational Structural Engineering
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• v.4 no.1
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• pp.17-19
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• 1991

본 글에서는 ANS(American Nuclear Society)에서 규정하고 있는 Safety Class 구조물 중 격납건물의 내진해석모델에 대해 주로 언급하며, 기타 건물(Non-Nuclear Safety "NNS")은 일반건물과 차이점이 없음으로 언급하지 않는다. U.S. NRC(Nuclear Regulatory Commision)는 참고문헌[1]에 의해 원자력 발전소내 여러건물중 SSE(Safe Shutdown Earthquake)하중에도 견디도록 규정하여 정확한 동력학적 계산이 요구되어지나, 그 이외의 건물들은 대개 등가정적 방법에 의해 해석되어진다. 이 해석방법은 여러 빌딩규정들에서 제안된 것으로 지진에 의한 동적하중을 밑면적 단력 또는 각층에 작용하는 층전단력이라는 등가의 정적하중으로 바꿔 계산되며 이 때 사용되는 해석모델은 건물의 기본진동만을 표시할 수 있는 간단한 것이다.