• Proceedings of the Korean Fiber Society Conference
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• 2001.10a
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• pp.167-170
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• 2001

실의 겉보기 물성 (apparent properties)은 실의 품질을 결정하는 중요한 요인중의 하나이다. 특히, 직물 또는 편성물과 같은 평면 섬유물의 경우, 실의 겉보기 굵기 변동은 섬유물의 표면 평활도, 색상, 등 감성적 제품 품질을 결정하게 된다. 이에 따라 실의 겉보기 성질이 섬유제품의 품질에 차지하는 비중이 점차 커지게 되었다 본 연구에서는 광속 밀도가 높고 회절이 적은 레이저 비임을 이용하여 실의 겉보기 굵기를 측정하여 방적사의 겉보기 굵기가 가지는 변동 특성을 해석하고, 측정 조건이 실의 굵기 측정 결과에 미치는 영향을 소개하고자 한다. (중략)

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2002.02a
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• pp.79-85
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• 2002

본 연구는 대추 수확기개발을 위한 기초연구로써 대추의 열매, 잎, 잎줄기의 물리적 역학적 특성을 조사.분석하였으며, 그 결과를 요약하면 다음과 같다. .대추 열매의 평균 장경, 경, 부피, 무게, 탈과력은 각각 32.02 mm, 23.9 mm, 10.0$\times$$10^{-6}$m$^3$, 5.2~12.8g, 5.7 N으로 나타났다. .대추무게가 증가하면 탈과력은 증가하고, F/W는 감소하는 경향을 나타났다. .대추나무가지의 평균 탄성계수는 7.01$\times$$10^{8}$ N/m$^2$였고, 가지의 굵기가 증가하면서 감소하였다. .대추나무가지의 평균 비틀림 강성은 5.2$\times$$10^{7}$ N/m$^2$으로 나타났으며, 가지의 굵기가 증가하면서 음의 지수 함수적으로 감소하는 경향을 나타냈으나, 데이터가 일정한 범위에 산재해 있어 가지의 굵기에 따른 강성계수변화 특성은 일정한 경향으로는 나타나지 않았다. .대추 잎줄기의 평균 무게, 잎수, 길이가 각각 0.7g, 6.6개, 12.2 cm로 나타났다. .대추 잎의 평균 잎면적, 무게, 탈리력은 각각 13 $cm^2$, 0.2g, 4.4 N으로 나타났다. .종말속도는 대추 열매의 무게가 증가하면서 증가하고, 대추잎의 무게, 면적이 증가할수록 감소하는 경향을 나타냈으며, 잎줄기의 종말속도는 잎줄기 무게 혹은 잎줄기에 매달린 잎의 수와는 거의 영향을 받지 않는 것으로 나타났으며, 잎줄기의 길이가 증가할수록 약간씩 증가하는 경향을 나타냈다.

• Journal of the Korean Society for Nondestructive Testing
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• v.20 no.4
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• pp.285-289
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• 2000

This study suggests a rebar detection technique for simultaneous detection of size and cover of embedded reinforcement in concrete. The structure of the probe made in this study is somewhat different from commercial ones. This probe has three sensing coils. Rebar size and cover depth can be evaluated by detecting and analyzing the signal from them. Amplitude and phase variation of each coil in the probe was investigated using an impedance analyzer and the loci of transfer functions of the coils were analyzed. The locus of transfer function from the sensing coil positioned inside excitation coil was simple as well known, but the others from the coils outside excitation coil were not so. Actual experiment on rebar detection was performed with our probe and an eddy current test system for various rebar sizes and depths. The signal shape according to variation of cover depths showed the same tendency with the transfer function loci acquired by impedance analyzer. The different variation pattern of signal enabled to evaluate rebar size and cover depth simultaneously.

• Proceedings of the Korean Society of Crop Science Conference
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• 2022.10a
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• pp.148-148
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• 2022

콩[(Glycine max(L.)]은 우리나라에서 벼와 더불어 주요한 식량작물이다. 농촌진흥청에서는 콩 생육데이터를 수집하여 생산성 향상모델을 개발하기 위해 '농업빅데이터수집및생산성향상모델개발' 사업을 수행하고 있다. 수집되는 콩 데이터는 농가정보, 콩 생육정보, 토양정보 부분으로 구성되어 있으며 농가정보는 시군, 시군구, 품종, 파종량, 종자확보경로 등이 수집되고 있다. 그리고 콩 생육정보는 경장, 줄기굵기, 마디수, 가지수, 꼬투리수, 꼬투리립수, 개체당 입수, 종실수량 등이 수집되어 있다. 토양정보는 수분, 지온, EC 등이 수집되고 있다. 주요 항목의 평균은 경장 47.4 cm, 줄기굵기 11.1 mm 마디수 12.7 개, 꼬투리수 54.0 개, 꼬투리립수 2.7 개, 종실수량 227.9 kg/10a 정도이며 토양수분은 26.3 %, 지온은 27.1 ℃ EC는 2.58 ds/CM 정도이다. 주요 형질의 상관관계는 종실수량과 개체당 협수가 0.651로 나타났으며 가지수, 꼬투리수, 개체당협수와 줄기굵기는 각각 0.783, 0.653, 0.663 정도로 나타났다. 추후 이를 기반으로 다중회귀 등 분석 가능한 방법(머신러닝 등)을 적용하여 콩수량을 예측할 수 있는지 검토할 필요가 있다. 또한 본 사업으로 수집된 자료를 분석하여 콩 수량에 영향을 미치는 주요 요인을 평가한 결과는 콩 생산성 향상을 위한 모델 작성에 중요한 자료로 활용될 수 있을 것으로 예상된다.

• Korean journal of applied entomology
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• v.57 no.4
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• pp.297-302
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• 2018

We surveyed branches of acacia trees distributed nationally in Korea to establish a common survey method that can be used by investigators to monitor for over-wintering Metcalfa pruinosa eggs. A total of 189 samples was examined, and the number of eggs on the surfaces of the branches, bases of thorns and bases of twigs was recored. When including samples in which no eggs were found at all investigation sites, none of the data followed the normal distribution. However, when samples in which no eggs were found at all sites were exclued, the density of eggs investigated at the thorn bases and twig bases followed the normal distribution. When the density of eggs was sorted based on the thickness of the branches on which they were found, these data did not follow the normal distribution. The density of M. pruinosa eggs at the thorn bases and twig bases was significantly higher than that on the branch surfaces, but there was no significant difference among branches of different thicknesses. Therefore, monitoring for M. pruinosa eggs at the thorn bases and twig bases of the nationally distributed acacia tree, irrespective of the thickness of the branches, will be able to increase the precision with which the density of this insect's eggs could be estimated. It is thus expected that this method will contribute to developing methods to better characterize the distribution and predict the occurrence of this.

• The korean journal of orthodontics
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• v.25 no.3 s.50
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• pp.263-271
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• 1995

The purpose of this study nab to evlauate and compare the effect of the variable factors of wire on the elastic properties of looped rectangular wire. Five variable factors were presented-material(Hi-T, blue Elgiloy), wire size(.016'$\;\times\;$.022', .018'$\;\times\;$.025'), loop length(15mm, 20mm), loop configuration(open loop, closed loop), gabling (non-gable, gable). So, the total 256 specimens were divided into 32 groups, and each of those nab pulled on Instron testing machine. The load-deflection curve of each wire obtained, from which force, range in elastic limit, and stiffness were computed and analyzed statistically. The results were obtained as follows : 1. All of the variable factors - wire material, size, loop length loop configuration, and gabling - took a significant effect on load-deflection rate of looped wire. 2. The force at elastic limit was the smallest in the group of Hi-T, .016'$\;\times\;$.022', 20mm loop length, open loop, non-gable, and the largest in the group of blue Elgiloy, .018'$\;\times\;$.025', 15mm loop length, closed loop, non-gable. 3. The range at elastic limit was the smallest in the group of Hi-T, .018'$\;\times\;$.025', 15mm loop length, open loop, non-gable, and the largest in the group of HI-T, .016'$\;\times\;$.022', 20mm loop length, closed loop, gable. 4. Loop configuration and loop length were the most effective factors on the elastic properties of looped wires, and gabling was the least effective.

• Journal of Korean Society of Forest Science
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• v.99 no.1
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• pp.52-56
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• 2010

Crown fuel characteristics such as crown bulk density, crown base height, and fuel moisture content of Japanese red pine were analyzed. Ten trees in Mt. Palgong at Daegu, were destructively sampled and their crown fuels were weighed separately for each fuel category. Fuel content of live and dead crown component were 53%, and 15.3%, respectively. Foliar moisture content was 56%. Needles and twigs with diameter less than 1cm diameter accounted for 16.2%, 55% of total and crown fuel load. Average crown bulk density of Japanese red pine was 0.24 kg/$m^3$, effective crown fuel bulk density was 0.1325 kg/$m^3$.

• Journal of Sericultural and Entomological Science
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• v.44 no.2
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• pp.56-58
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• 2002

An autotetraploid, Sawonppong 28 was derived from a thick-leaf and highly productive mulberry variety, Huyeoprok, by colchicine solution treatment on growing point and its characteristics were as follows. The number of somatic chromosomes of the derived variety was 2n=56 of an autotetraploid and green tip sprouting stage was medium budding variety with triangular oval shape and thick leaves contained rich chlorophyll. The length of branches was comparatively short and the number of branches was also small. However the branches were thick and non-budding length percentage at basal part of branch was high and cold hardiness was weak.

• Korean Journal of Plant Resources
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• v.29 no.5
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• pp.598-603
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• 2016

The aim of this study was to elucidate the influence of vigor of a bearing shoot in ‘Bluecrop’ Highbush Blueberry (Vaccinium corymbosum L.) on growth characteristics of shoots and fruits. Bearing shoots were classified with BS (bearing shoot) and BMB (bearing mother branch). The vigor of bearing shoots were divided into four arbitrary categories; A was thin (< 6.0 ㎜) BMB and short (< 10 ㎝) BS, B was thin BMB and long (≥ 10 ㎝) BS, C was thick (≥ 6 ㎜) BMB and short BS and D was thick BMB and long BS. Shoots from D were longer (6.5 ㎝) and thicker (1.70 ㎜) than those from the others. Shoots of D had more leaves (5.8 ea) than those of the others. Leaf area of D was larger (13.5 ㎠) than those of the others. The first harvest of D was one week faster than the others. Ratio of big berry (>14 ㎜) from the long BSs was higher (B : 41.7, D : 46.8%) than that from the short BSs. Soluble solid content of small berrys did not show any different according to vigor of bearing shoots, but soluble solid content of big berrys of the long BSs was higher (B : 16.2, D : 15.6°Bx) than those of the short BSs. The thickness of BMB did not affect ratio of fruit size and soluble soild content. The long BSs would be proper than the short BSs for bearing bigger fruits.

• Journal of Sericultural and Entomological Science
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• v.50 no.2
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• pp.166-170
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• 2012

Most of Cudriania tricuspidata Bureau saplings in Korea have been produced by crown division. But the production of Cudriania tricuspidata B. saplings by this method is very low in efficiency and in uniformity. Therefore, to develop Cudriania tricuspidata B. saplings production system by cutting method which is suitable for mass production, several conditions on rooting and growth of cuttings were investigated. The rooting ability of cuttings varied according to temperature on the bed, length, thickness of the hard wood cutting and rooting agent application. Of different concentration of rooting agent, the 5,000 ppm of 1-naphthalenacetic acid(NAA) and Indole butyric acid(IBA) were found to be the highest in rooting of hardwood cuttings; other concentration were in order as follows; 2,500, 1,000 and 10,000 ppm in concentration of rooting agents. The shading ratio of polyethylene film showed the highest rooting ratio of the softwood cuttings at 55%.