• 한국연초학회지
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• 제19권1호
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• pp.18-23
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• 1997

The study was carried out to clarify reasonable production of healthy seedling, optimal Pot depth, and appropriate transplanting time, which can be deduced from understanding of seedling quality. Seedling quality results from growth of root and shoot, morphology and distribution of root system under influence of Pot depth during seedling growing period. Stem height, shoot dry weight, leaf area and leaf number were increased in proportion to depth of pots. Growth of shoot and root during seedling growing period showed the most dramatic development between 20th and 25th day after temporary planting. Root number increased as pot depth decrease and total root length and dry weight increased as pot depth increase. In 5cm pot, relative multiplication rate was higher and mean extension rate was lower than other depth of Pot. The limitation of pot volume in which rhizosphere was located enhance the development of roots of second and third order. At 20th days after temporary Planting root distribution was relatively uniform in length and development of adventitious root on stem base was poor as Pot depth decreased.

• 한국지구물리탐사학회:학술대회논문집
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• 한국지구물리탐사학회 2008년도 공동학술대회
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• pp.167-172
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• 2008

경북 문경군 가은읍 가은역 일대 석회암 분포 지역에서 지하 공동의 위치 및 발달 양상을 파악하기 위하여 고정밀 중력탐사를 하였다. 측점 간격은 4m로 하여 모두 약 1,100 측점에서 중력을 측정하였다. 잔여 부게 이상도에서 가장 낮은 중력 이상대를 지나는 3개의 측선에 대하여 MS(minimum support) 역산으로 밀도 분포 단면을 작성하였다. 또한, growing body 역산을 이용하여 3차원 밀도 분포 영상을 구하였다. 2차원과 3차원 밀도 분포도는 공동이 발달한 지역을 잘 가리키고 있으며, 석회암이 지하수에 부분적으로 용해되어 복잡한 형태의 공동 시스템을 구성하고 있고 부분적으로는 상당히 얕은 곳까지 발달해 있을 것으로 해석된다.

• 농약과학회지
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• 제12권1호
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• pp.74-81
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• 2008

벼 재배 환경에서 농약의 분포 및 유출특성과 농업환경으로의 노출성을 구명하기 위해서 살포농약의 제형과 벼 생육단계에 따른 경시적 분포양상 실험을 수행하였다. 벼 이앙전 처리제로 제초제인 butachlor 유탁제와 oxadiazon 유제의 논물 중 잔류양상은 처리 3일 후에 초기처리량의 90%이상이 소실되는 것으로 나타났고, 벼 이앙 후 15일 이내에 처리한 butachlor, thiobencarb 및 molinate 입제의 농약성분의 95%이상이 논물과 토양에 분포되어, 비살포 지역으로 유출을 방지할 수 있는 유출안전기간은 농약살포 후 5일로 설정하였다. 벼 생육 중기에 살포된 iprobenfos 입제, tricyclazole 수화제, phenthoate 유제의 처리직후 2시간 후의 분포는 논물에서 16.1, 48.9와 38.9%, 토양에서 83.6, 15.4와 10.7%, 식물체에서 는 0.3, 35.7과 50.4%가 각각 분포되었다. 또한 벼생육 후기 농약분포는 tricyclazole 수화제와 Phenthoate 유제는 논물에서 7.8과 9.8%, 토양에서 21.7과 5.1%, 식물체에서 70.5와 85.1%가 각각 분포되어 식물체 biomass가 증가 할수록 농약 부착량이 식물체에 분포되어 논물과 토양에 적은 양이 분포되었다.

• 한국환경생태학회지
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• 제23권4호
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• pp.346-352
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• 2009

본 연구는 해식애 식생구조의 기초자료로 제공하기 위하여 배열법으로 갯기름나물군락과 동반출현하여 혼생하는 주요 식물의 지형적 분포 및 생육 양상을 분석하였다. 해식애의 갯기름나물군락에서 10% 이상의 출현빈도를 나타내는 혼생식물은 26종이었으며, 출현 빈도가 가장 높은 식물은 해국(55.7%)이었다. 갯기름나물군락의 혼생식물은 내륙육지 방향, 해안선방향, 평탄면, 사면 등의 지형요인별 분포 및 생육 양상을 달러하였다. 그리고 분포 및 생육 양상은 모든 지형요인에서 차이가 없이 고르게 분포하는 전형적 형태, 1개의 지형요인에서 양호한 분포를 나타내는 일방적 형태, 2개 또는 그 이상의 지형요인에서 양호한 분포를 보이는 복합적 형태로 구분되었다. 사철쑥과 땅채송화 등은 전형적 형태, 갯보리와 쑥 등은 일방적 형태의 분포 및 생육 양상을 나타내었고, 해국억새 갯메꽃 갯까치수영 등 16종(전체 혼생식물의 61.5%)의 식물이 복합적 형태로 갯기름나물과 혼생하여 양호한 생육을 보였다.

• 식물분류학회지
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• 제38권3호
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• pp.315-332
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• 2008

서해 중부지역에서의 상록활엽식물의 분포를 밝히기 위해 2006년 5월부터 2008년 3월까지 인천광역시에 속하는 136개 도서를 조사하였다. 이번 조사에서 28개 유인도와 49개 무인도 등 총 77개 도서에서 12종의 상록활엽식물이 조사되었다. 이 중 가장 흔한 종은 사철나무, 보리밥나무, 동백나무, 도깨비쇠고비 등이었다. 이들 식물은 또한 조사지역중 최북단에 위치한, $N 37^{\circ}60^{\prime}$ 부근 백령도에서도 자란다. 한편 송악, 붉가시나무, 참식나무, 마삭줄 등 4종은 $N 37^{\circ}10^{\prime}$ 부근 덕적면까지만 발견된다. 그러나 이들 식물은 육지에서는 한반도 남쪽이나 서남해안 지역까지 자란다. 상록활엽식물이 이런 고위도 도서지역까지 분포하는 것은 서해 난류의 영향으로 보인다. 현지조사와 문헌을 기초로 각 도서 별 상록활엽식물의 분포를 기재하였다.

• 한국세라믹학회지
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• 제29권7호
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• pp.539-543
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• 1992

The continuous growth method was developed for Mn-Zn Ferrite single crystals. It is a new process that the polycrystalline MnχZn1-χFe2O4 raw materials are supplied continuously from the powder feeding system to the crucible heated by R.F. induction and melted in the crucible, and after the single crystals seed is attached to crucible's hole, the crystals are pulled downward with rotation. Growing the crystals by using the growth method different from the conventional Bridgman or Floating Zone method, we defined the factors having effect on the crystal growing through the pre-experiments. They are temperature distribution in the crucible, melt velocity according to its height, wettability between the crucible's bottom and melt. Therefore, Mn-Zn Ferrite single crystals were to be grown by attaining the appropriate melt height in the crucible, powder feeding rate, temperature gradient between the crucible and interface, crystal growing speed, and this method was confirmed to have possibility for single crystal growing.

• Structural Engineering and Mechanics
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• 제82권2호
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• pp.259-270
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• 2022

The paper investigates the residual stresses arising in a thermoviscoelastic cylinder as a result of layer-by-layer deposition of material on its lateral surface. Internal stresses are caused by incompatible deformations that accumulate in the assembly as a result of joining parts with different temperatures. For the analysis of internal stresses, an analytical solution to the axisymmetric quasi-static problem of thermoelasticity for a growing cylinder is constructed. It is shown that the distribution of residual stresses depends on the scenario of the surfacing process. In this case, the supply of additional heat to the growing body can significantly reduce the unevenness of temperature fields and reduce the intensity of residual stresses. The most effective is uneven heating, which can be realized, by the action of an alternating current with a tunable excitation frequency. The temperature and residual stresses fields on the growing surface is analyzed numerically for Titanium and Copper materials.

• 한국식품과학회지
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• 제32권4호
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• pp.772-787
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• 2000

In this study, evaluation on the loaches from the various sources was carried out in respect of their taste compounds. The samples were classified by local, season and growing condition and evaluated in terms of composition, the refuse, contents of nucleotides and their related compounds, total and free amino acid, organic acid and fatty acid. Evaluation on the compositions revealed the fact that, in terms of the local, the imported loach contain a low level of fat and high level of ash, in comparison with Korean loach; in terms of growing condition, cultured loach contains a high level of fat and low level of moisture, in comparison with wild loach; and in terms of the season, the summer loach contains less moisture than the fall loath; but as for the contents of other component, the summer loach was superior. As for the refuse, the imported loach had a greater refuse than the Korean loach. In the growing condition, the wild loach had lower value than the cultured loach. There was no substantial difference in each season. Also nucleotide and these related compounds were detected in all of the samples, while ATP was not found. The content levels of such detected compound did not show a substantial difference in each condition. However, generally, the imported loach was poor in such compound and all of the samples were high in IMP. The samples were high in total amino acids. The local and growing conditions showed no substantial difference, while in the season, the summer loach had a higher content of total and essential amino acid than the fall loach. As for the contents of free amino acids, similar distribution of the composition was shown in each sample, even though there was little difference in their constituents. Also, total content of free amino acid varied with the conditions of the samples. As for total content of organic acid and the distribution of the composition, there was a little difference between each condition. In the season and growing condition, the summer loach was high in organic acid. As for the distribution of the fatty acid compositions, there was no substantial difference between each condition and each sample. In the case of the wild loach, the summer loach was high in ${\omega}-3$ polyunsaturated fatty acid and the fall loach was high in essential fatty acid. Similarly, in the case of the imported loach, the summer loach was high in ${\omega}-3$ polyunsaturated fatty acid and the fall loach was high in essential fatty acid.

• 한국환경복원기술학회지
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• 제5권2호
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• pp.1-8
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• 2002

The aim of this study was to generate systemic data for the aquatic plant distribution according to water depth and crossing slope in the shoreline. The results of this study were as follows; 1. Anxiety to 0 near area Bidens frondosa, Scirpus tabernaemontani, Carex dispalata etc. total class 21 observe, and Phragmites communis, Iris pseudoacorus etc. class 6 of anxiety 0-70cm extent examined. Class 21 of anxiety observed all such as Bidens frondosa, Scirpus tabernaemontani, Carex dispalata in near area to 0, and Phragmites communis, Iris pseudoacorus etc. class 6 of anxiety 0-70cm extent examined. Anxiety 70-100cm extent Nymphoides indica, Ttapa japonica etc.. class 2 appeared to line Zizania latifolia, Typha angustata back 2 papers, 130cm and examined that Nelumbo nucifera was limit anxiety state 230cm. 2. Aquatic plants of Phragmites communis, Zizania latifolia, Typha angustata etc. range mainly to gentle gradient of slant 10 degree low and distribution pattern was ranging by Zizania latifolia, Typha angustata, Phragmites communis period of ten days from deepwater place. Nelumbo nucifera was forming become independent stock keeping away invasion of plant that ability to breed was different because was prosperous. Slant 10 bores was growing near sleep in been strange steep slope earth and distribution of emerged plant appeared punily and emerged plant and swampy land plant were ranged extensively in gentle gradient of 10 degree low. 3. On lake surrounding plant when wish to do distribution of natural conditions reference need to. That is, gentle gradient and distribution form of steep slope earth are different, and same pitch must consider enough this because appear as distribution, distribution according to that some plant species were growing was different.

• 대한안전경영과학회지
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• 제19권4호
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• pp.115-123
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• 2017

Recently there is a growing interest in the airborne spread of virus. In particular, there is growing interest in secondary infection through the air in the hospital. The distribution of air-born virus depends on ventilation system installed in a hospital. In this study, simulations were carried out to predict the move of air-born virus by ventilation system at hospital. Simulation results showed that pressure distribution was -372.05Pa ~ -3.45 Pa at 1st floor incase of only used mechanical exhaust at bathroom, shower stall, storage, kitchen etc.. if ventilation switch from used mechanical exhaust to mechanical exhaust & mechanical supply. Simulation results showed that pressure distribution was -336.44Pa at stair hall < -0.2Pa at bathroom < mean 1.19Pa at other room. So simulation results showed that using all of the mechanical supply and mechanical exhaust was more effective then the mechanical exhaust for maintain the pressure distribution in hospital. It was also showed that when using the mechanical supply and mechanical exhaust more effectively prevention of air born virus diffusion.