• 한국자원식물학회지
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• 제19권6호
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• pp.697-699
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• 2006

To find out the best complex fertilizer for high yielding of rapeseed crop, experiment was conducted on complex fertilizers at the experiment field in upland of rapeseed in Mokpo Experiment Station, Nat'l Institute of Corp Science, RDA, Korea. Experiment was laid out in randomized complete block (RCBD) design. The effects of complex fertilizer (22-22-11) on the number of branches, pod length, percentage of seed set and seed yield were highest but on the plant height, ear length, and number of pods per ear were negligible. On th basis of the results reported above, for getting higher yield of rapeseed crop, among the tested fertilizers complex fertilizer (22-22-11) gave the superior performance and is recommended for application.

• 한국작물학회지
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• 제32권4호
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• pp.392-402
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• 1987

본실험 '식물생장조절제의 콩종자처리가 수향 구성요소간의 상관계수에 미치는 영향'은 식물생장조절제의 콩종자처리가 콩의 초기생육에 어떠한 영향을 주며 이러한 초기영향이 생육후기까지의 지속여부 및 수량 구성요소에 미치는 영향을 연구하기 위한 것이다. 사용한 종자는 Bragg로서 10ppm의 kinetin, ethrel , IAA and salicylic acid에 침지한 후 근류균 인공접종후 파종하였다. 대조구로는 물에 침지한 종자를 사용하였다. 시료는 주기적으로 포장에서 채취하여 초기성장, 근류균형성 생화학적 변화(엽록소함량, Nitrate Reductase활성도) 및 수량 구성요소 등을 보았으며 결과는 다음과 같다. 1. kinetin, IAA 및 Ethrel은 초기생육을 촉진시켰으나 페놀계통의 SA는 발아과정을 지연시켰으며 가장 낮은 발아율을 보였음. 2. kinetin, ethrel, SA는 근류형성을 촉진했으나 IAA는 초기근류형성을 다소 지연시켰으나 후기에는 촉진시켰음. 3. kinetin, ethrel, IAA는 엽록소함량 및 N-RA에 유의성 있는 증가효과를 보였으나 SA는 대조구와 비슷한 경향을 보였음 4. SA는 개화촉진 및 개화수 증가에 가장 효과적이었는데 이는 패놀계통의 화학물질이 작물체의 영양생장에서 생식생장 단계로의 전환을 촉진하고 있음을 보였으며 이러한 생식생장기관의 증대가 수량증대에 기여한 것으로 나타남. 5. 전처리구에서는 수량 및 수량구생요소(꽃수, 협수, 주당립수)가 유의성 있는 증가를 보였으나 협당립수 및 결협률에는 유의성이 없었음 6. 수량은 협수(r=-0.962)와 가장 높은 정의 상관관계를 보였으나 100 립 중과는 부의 상관관계를 보임 (r =-0.634). 7. 100립중의 경우 전 처리구가 대조구보다 낮았는데 이는 식물생장조절제의 처리가 동화생산기관 (source) 및 저장기관(sink)을 동시에 증가시켜 수량증가효과를 가져왔으나 증가된 생산기관(source)이 증가된 저장기관(sink)에 동화물질을 충분히 공급할 수 없음에 따른 동화물질 분배상의 희석 효과(dilution effect)로 보여짐.

• Nuclear Engineering and Technology
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• 제55권6호
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• pp.1999-2010
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• 2023

Undesirable flapping motion of discs can cause the failure of swing check valves in nuclear passive safety systems. Time-resolved particle image velocimetry (PIV) was employed to investigate the flow characteristics around a free-to-rotate plate and the motion response, with the Reynolds numbers, based on the hydraulic diameter of the channel, from 1.32 × 10⁴ to 3.95 × 10⁴. Appreciable flapping motion (±3.52°) appeared at the Reynolds number of 2.6 × 10⁴ with the frequency of 5.08 Hz. In the low-Reynolds-number case, the plate showed negligible flapping. In the high-Reynolds-number case, the deflection angle increased with reduced flapping amplitude. The torque from the fluid determined the flapping amplitude. In the low-Reynolds-number case, Karman vortices were absent. With increasing Reynolds numbers, Karman vortices developed behind the plate with larger deflection angles. Strong interaction between the wake flow from the leading and trailing edge of the plate was observed. Based on power spectrum density (PSD) analysis, the vortex shedding frequency coincided with the flapping frequency, and the amplitude was positively correlated to the strength of the vortices. Proper orthogonal decomposition (POD) modes evince that, in the case of appreciable motion, coherent structures exhibited a larger spatial scale, enhancing the magnitude of the external torque on the plate.

• 한국자원식물학회지
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• 제1권1호
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• pp.1-7
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• 1988

This experiment were carried out to study the heritability, genotypic, pheno-typic and environmental correlation in four edible oil crops. Heritabilities of flowering date, maturing date, plant height and weight of 1, 000 grains in rape were high. A highly significant positive correlation was found between flowering date and maturing date, plant hight and ear length, number of pods per ear and flowering date, maturing date and plant hight, The number of seed per pod showed also significant positive correlation with flowering or maturing date as well as with the relationship between weight of 1, 000 grains and plant height or ear length inrapeseed, respectively. Heritabilities of maturing date, length of stem with eapsule and number of seed per capsule were high, in sesame. Genotypic correlation between plant height and length of stem with capsule, length of stem with capsule and number of capsule per plant, number of capsule per plant and weight of 1, 000 grains, weight of 1, 000 grains and yield were highy positive in sesame. Heritabilities of flowering date, length of main stem, weight of 100 grains and number of shells per square meter in peanut were high, There was positive genotypic correlation between length of main stem and yield, number of shells per quare meter and matured seed ratio, number of shells per square meter and yield, 100 grains weight and yield. On the other hand, a significant negative correlation appeared between flowering date and yield. Heritabilities of days to flowering, stem length, stem diameter and weight of 1, 000 grains in perila were high. There was positive genotypic correlation between stem length and stem diameter, number of pods per plant, stem weight etc, between number of internodes and number of pods per plant, stem weight, number of valid branches and number of pods plant as well, respectively. While, a significant negative correlation was observed between number of valid branches and weight of 1, 000 grains, between number of pods per plant and weight of 1, 000 grains.

• 한국작물학회지
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• 제49권4호
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• pp.279-283
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• 2004

This experiment was carried out at paddy field (commercial silty loam soil) in the southwestern Korea. Pungsannamulkong, a determinate growth habit, was a relatively high yielding and late maturing cultivar, and Han­namkong, a semi determinate growth habit, was a relatively low yielding and early maturing cultivar. Seeds were sowed at two plants and with a planting density of $70{\times}10cm$ on May 26, 2003. Fertilizer was applied prior to planting at a rate of 3.0-3.0-3.4g $(N-P_2O_5-K_2O)\;per\;m^2$ by all basal fertilizations. Experimental design was a randomized complete block with three replications. Seed yield was higher in Pungsannamulkong by 362g per $m^2$ than in Hannamkong of 260g per $m^2$ Also, the number of pod, number of seed, and number of seed per pod were greater in Pungsannamulkong than in Hannamkong. The number of leaves per $m^2$ showed similar with two soybean cultivars up to August 24 but thereafter it decreased in Hannamkong. The leaf area up to August 4 increased in Hannamkong higher than in Pungsannamulkong, but after that time, Pungsannamulkong had greater leaf area than Hannamkong. The shoot and leaf dry matter of two soybean cultivars from June 23 to August 4 were similar but thereafter, Pungsannamulkong had a significantly greater than Hannamkong. Crop growth rate (CGR), relative growth rate (RGR) and net assimilate rate (NAR) for Punsannamulkong were relatively higher than Hannamkong but leaf area ratio (LAR) and specific leaf weight (SLW) showed higher in Hannamkong. Most of leaves distributed in the ranges of 80-90cm and 60-70cm from the soil surface in Punsannamulkong and Hannamkong, respectively. Pods of Punsannamulkong ranged 10-80cm from the soil surface and most of pods were distributed at 40-50cm. Photosynthetic rate at the flowering stage showed a significant difference between cultivars in the upper most leaf position. There was no significant difference of the photosynthetic rate at $7^{tn}$ leaf at the flowering stage, and the uppermost and 7th leaf position at the seed development stage between two soybean cultivars.

• 한국작물학회지
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• 제11권
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• pp.121-126
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• 1972

콩의 다비밀식재배에 Regim-8를 이용하여 화학적적심을 하였을 때 콩의 생장 및 발육에 어떤 영향을 주는가 하는 것을 알기 위하여 품종, 약제량, 처리시기, 파종시기, 재식밀도 등을 각각 달리하여 시험하였든바 그 결과는 다음과 같았다. 1) 어떤 품종에 대하여서나 Regim-8는 10a당 50cc를 100ι의 물에 풀어서 6엽때 살포하였을 경우 초장이 가장 많이 단축되었고 따라서 도복도 적게되었다. 2) 분지수가 많아져 종실수가 증가된 반면 원줄기 마디수는 감소되었다. 3) 식물체의 수광체제가 좋아졌고 개체당 꼬투리수도 증가되어 결국 10a당 수량이 증가되었다. 4) 밀식에 의한 도복을 방지하므로서 증수되는 경향을 보여 주었다.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2016년도 춘계학술대회
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• pp.98-99
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• 2016

본 연구에서는 $360^{\circ}$의 조향 기능을 갖는 듀얼 구동식의 선박 접이안 시스템 개발에 대해 다룬다. 대형 선박의 경우, 부두에 접이안시 bow thruster, side thruster, pod propulsor 등이 사용되고 있으나 최근 해양레저선박이 대형화(슈퍼요트 등)됨에 따라 마리나 시설을 이용할 경우 접이안시 선박 대 선박, 선박 대 계류시설과의 사고가 증가 추세에 있다. 따라서, 이를 해결하기 위한 방안으로 듀얼 구동식 추진체를 이용하여 접이안이 가능한 시스템에 대해 연구를 수행하였다. 주요 내용은 조이스틱을 이용한 선수, 선미의 듀얼 구동과 마그네틱 기어를 이용한 동력 전달이다. 조이스틱에서 두 구동 모터 및 프로펠러로 이어지는 제어 응답성을 확인하고, 전자기 설계를 통한 마그네틱 기어 제작 및 시험으로 수중 추진기에 회전력을 전달 가능한 토크를 확보하였다. 또한, 실해상 시운전을 통하여 개발 시스템의 성능을 확인하였다.

• 한국대기환경학회지
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• 제34권3호
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• pp.493-507
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• 2018

Due to high spatio-temporal variability of amount and optical/microphysical properties of atmospheric aerosols, satellite-based observations have been demanded for spatiotemporal monitoring the major aerosols. Observations of the heavy aerosol episodes and determination on the dominant aerosol types from a geostationary satellite can provide a chance to prepare in advance for harmful aerosol episodes as it can repeatedly monitor the temporal evolution. A new geostationary observation sensor, namely the Advanced Himawari Imager (AHI), onboard the Himawari-8 platform, has been observing high spatial and temporal images at sixteen wavelengths from 2016. Using observed spectral visible reflectance and infrared brightness temperature (BT), the algorithm to find major aerosol type such as volcanic ash (VA), desert dust (DD), polluted aerosol (PA), and clean aerosol (CA), was developed. RGB color composite image shows dusty, hazy, and cloudy area then it can be applied for comparing aerosol detection product (ADP). The CALIPSO level 2 vertical feature mask (VFM) data and MODIS level 2 aerosol product are used to be compared with the Himawari-8/AHI ADP. The VFM products can deliver nearly coincident dataset, but not many match-ups can be returned due to presence of clouds and very narrow swath. From the case study, the percent correct (PC) values acquired from this comparisons are 0.76 for DD, 0.99 for PA, 0.87 for CA, respectively. The MODIS L2 Aerosol products can deliver nearly coincident dataset with many collocated locations over ocean and land. Increased accuracy values were acquired in Asian region as POD=0.96 over land and 0.69 over ocean, which were comparable to full disc region as POD=0.93 over land and 0.48 over ocean. The Himawari-8/AHI ADP algorithm is going to be improved continuously as well as the validation efforts will be processed by comparing the larger number of collocation data with another satellite or ground based observation data.

• 천문학회보
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• 제42권2호
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• pp.61.1-61.1
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• 2017

As the application of deep-learning methods has been succeeded in various fields, they have a high potential to be applied to space weather forecasting. Convolutional neural network, one of deep learning methods, is specialized in image recognition. In this study, we apply the AlexNet architecture, which is a winner of Imagenet Large Scale Virtual Recognition Challenge (ILSVRC) 2012, to the forecast of daily solar flare occurrence using the MatConvNet software of MATLAB. Our input images are SOHO/MDI, EIT $195{\AA}$, and $304{\AA}$ from January 1996 to December 2010, and output ones are yes or no of flare occurrence. We consider other input images which consist of last two images and their difference image. We select training dataset from Jan 1996 to Dec 2000 and from Jan 2003 to Dec 2008. Testing dataset is chosen from Jan 2001 to Dec 2002 and from Jan 2009 to Dec 2010 in order to consider the solar cycle effect. In training dataset, we randomly select one fifth of training data for validation dataset to avoid the over-fitting problem. Our model successfully forecasts the flare occurrence with about 0.90 probability of detection (POD) for common flares (C-, M-, and X-class). While POD of major flares (M- and X-class) forecasting is 0.96, false alarm rate (FAR) also scores relatively high(0.60). We also present several statistical parameters such as critical success index (CSI) and true skill statistics (TSS). All statistical parameters do not strongly depend on the number of input data sets. Our model can immediately be applied to automatic forecasting service when image data are available.

• 한국육종학회지
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• 제43권3호
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• pp.218-221
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• 2011

나물용 녹두 신품종 '주현'은 금성녹두와 VC1834-4-B-2-B-3B-B를 인공교배하여 2009년에 육성되었다. '주현'의 생육습성은 직립, 잎 모양은 심장형, 백축색은 녹색, 성숙기에 꼬투리는 검고 곧으며, 종피는 광택이 없는 녹색이다. 개체당 협수는 26개로 표준품종인 '어울녹두'보다 8개 많고, 녹두나물 수율은 표준품종보다 18% 많다. '주현'은 바이러스, 갈색무늬병, 흰가루병 및 도복에 대한 포장저항성은 강하고, 평균수량은 1.84 MT/ha으로 표준품종보다 6% 높다.