• 한국농공학회논문집
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• 제54권1호
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• pp.11-18
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• 2012

This study was investigated agricultural water supply system of major agricultural waterway for Gimje canal, Jeongeup canal, Dongjin river conduit of Dongjin river basin. Furthermore, this result will be used for water resources and agricultural demand in Saemangeum reclaimed arable land. Annual precipitation for 5 years in Dongjin river basin was 1,311.7mm. The average discharges in Dongjin river basin was $1,390{\times}10^6\;m^3$ and $1,516{\times}10^6\;m^3$ and $744{\times}10^6\;m^3$ for 2,007 and 2008, respectively. Also, annual average amount of water resources was 1,861${\times}10^6\;m^3$ and $2,279{\times}10^6\;m^3$ and $1,227{\times}10^6\;m^3$ for 2,007 and 2008, respectively. Dongjin river basin water system for the analysis of agricultural water in water resources, runoff, agricultural water demand and usage surveys were analyzed, resulting in the total amount of water due to precipitation of the watershed of the $12.3{\times}10^9\;m^3$ ~$22.8{\times}10^9\;m^3$ and Dongjin River basin in waters flowing discharge is $7.4{\times}10^9\;m^3$~$16.1{\times}10^9\;m^3$, agricultural water demand and usage of each of $6.8{\times}10^9\;m^3$~$6.9{\times}10^9\;m^3$ and $4.9{\times}10^9\;m^3$~$7.1{\times}10^9\;m^3$ compared to the agricultural water demand was more likely. Agricultural water supply system in Dongjin river basin is complex because of devided branches to the main canal and branch canal. In this process, accurately assessment of water usage is very difficult. Therefore, systematic management of water resources and supply of agricultural water supply system to use the terms of the complexity and diversity by considering the appropriate level of agricultural water management systems will be needed. As a result of this study, it can be used water resources assessment in quantity, rational usefulness and basic planning of water resources development for water distribution.

• Plant Breeding and Biotechnology
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• 제6권4호
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• pp.426-433
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• 2018

Plant tissue culture is a technique that has invariably been used for various purposes such as obtaining transgenic plants for crop improvement or functional analysis of genes. However, this process can be associated with a variety of genetic and epigenetic instabilities in regenerated plants, termed as somaclonal variation. In this study, we investigated mutation spectrum, chromosomal distributions of nucleotide substitution types of single-nucleotide polymorphisms (SNPs) and insertions/deletions (InDels) by whole genome re-sequencing between Dongjin and Nipponbare along with regenerated plants of Dongjin from different induction periods. Results indicated that molecular spectrum of mutations in regenerated rice against Dongjin genome ranged from $9.14{\times}10^{-5}$ to $1.37{\times}10^{-4}$ during one- to three-month callus inductions, while natural mutation rate between Dongjin and Nipponbare genomes was $6.97{\times}10^{-4}$. Non-random chromosome distribution of SNP and InDel was observed in both regenerants and Dongjin genomes, with the highest densities on chromosome 11. The transition to transversion ratio was 2.25 in common SNPs of regenerants against Dongjin genome with the highest C/T transition frequency, which was similar to that of Dongjin against Nipponbare genome.

• Current Research on Agriculture and Life Sciences
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• 제29권
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• pp.1-10
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• 2011

This study was conducted to determine the agronomic characteristics of low amylose lines which were derived from induced mutants by T-DNA insertion. The agronomic and physicochemical properties of the low amylose mutants were analyzed and compared with a donor cultivar 'Dongjin' and a low amylose cultivar 'Baekjinju'. The heading date of the low amylose mutants was similar to the donor cultivar 'Dongjin' and yield index of the mutants was 78~92% compared with 'Dongjin'. The amylose content of four mutants in brown rice was ranged from 16.1 to 16.7%. Among low amylose mutants, 'P50-4-4-5' was lower 3.6%(13.3%) than those of 'Dongjin'(16.9%) in amylose content of milled rice. The grain length of 'P50-4-4-5' was similar to the donor cultivar, however, thousand grain weight(18.9g) was lighter than those of 'Dongjin'. The score of alkali digestion in brown rice of 'P50-4-4-5'(5.5) was lower than that of 'Dongjin'(6.8) and similar to 'Baekjinju'(5.8). The gel consistency of 'P50-4-4-5'(84mm) in milled rice exhibited that was longer than 'Dongjin'(76mm) and 'Baekjinju'(81mm). The result of eating quality showed that 'P50-4-4-5'(78.8) was higher than those of 'Dongjin'(60.3) and 'Baekjinju'(67.2). Thus our data suggest that 'P50-4-4-5' will facilitate the development of a new cultivar with low amylose rice.

• 상하수도학회지
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• 제23권1호
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• pp.97-105
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• 2009

Analysis was done on the particle size distribution of sediments flown into Saemangeum from the Mankyung and Dongjin River. The organic pollutants and heavy metal existing in the sediments were analyzed, which was further used to study the properties of pollution in the sediments according to the particle size distribution. Conclusions shown below were made from these analyses. The particle size distribution showed a big difference between the upriver areas of Mankyung and Dongjin River. Particles under $75{\mu}m$ showed to be around 85% at Dongjin River, while it showed to be around 70% at Mankyung River. This kind of distribution in particle size concluded in greatly affecting the contamination density of the sediments. From the analysis done on the soil type of sediments, deposition in Mankyung River categorized into Silty loam and Sandy loam, where Silty loam covered most of area and deposition in Dongjin River categorized into Sand, Loamy sand, Silty loam, Sandy loam. Considering the weight ratio, the density of contamination of the sediments by particle size at Dongjin and Mankyung River has been analyzed to show that organic pollutants and heavy metals occupy more than 70% of the whole contamination in the range under the particle size of $75{\mu}m$.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.1305-1307
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• 2009

We have investigated the new modification of poly (vinyl phenol) (PVP) for low hysteresis organic thin film transistors (OTFTs). In order to suppression of hysteresis phenomenon, synthesized various backbone structure polymeric gate dielectric. The modified polymeric dielectric was synthesized by inducing ringshape phenol backbone structure instead of conventional chain. We could be observed that relieved hysteresis and excellent air stability from ring-shape phenol backbone structure.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.563-565
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• 2009

We introduce the new modification approaches of photocrosslinkable poly (4-vinylphenol) (PVP) for low hysteresis organic thin film transistors (OTFTs). The dielectric layers were composed of different PVP resin, low molecular melamine, and halogen free photo-initiator. The low hysteresis OTFT from one of the organic gate dielectrics has been realized. The electrical performance of low hysteresis OTFT with photocrosslinkable PVP exhibited a field-effect mobility of 0.2 cm2/Vs, a threshold voltage of - 0.04V, hysteresis of 0.4V.

• Journal of Ecology and Environment
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• 제40권1호
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• pp.34-44
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• 2016

Background: Little is known about how chemical water quality is associated with ecological stream health in relation to landuse patterns in a watershed. We evaluated spatial characteristics of water quality characteristics and the ecological health of Dongjin-River basin, Korea in relation to regional landuse pattern. The ecological health was assessed by the multi-metric model of Index of Biological Integrity (IBI), and the water chemistry data were compared with values obtained from the health model. Results: Nutrient and organic matter pollution in Dongjin-River basin, Korea was influenced by land use pattern and the major point sources, so nutrients of TN and TP increased abruptly in Site 4 (Jeongeup Stream), which is directly influenced by wastewater treatment plants along with values of electric conductivity (EC), bacterial number, and sestonic chlorophyll-a. Similar results are shown in the downstream (S7) of Dongjin River. The degradation of chemical water quality in the downstream resulted in greater impairment of the ecological health, and these were also closely associated with the landuse pattern. Forest region had low nutrients (N, P), organic matter, and ionic content (as the EC), whereas urban and agricultural regions had opposite in the parameters. Linear regression analysis of the landuse (arable land; $A_L$) on chemicals indicated that values of $A_L$ had positive linear relations with TP ($R^2=0.643$, p < 0.01), TN ($R^2=0.502$, p < 0.05), BOD ($R^2=0.739$, p < 0.01), and suspended solids (SS; ($R^2=0.866$, p < 0.01), and a negative relation with TDN:TDP ratios ($R^2=0.719$, p < 0.01). Conclusions: Chemical factors were closely associated with land use pattern in the watershed, and these factors influenced the ecological health, based on the multimetric fish IBI model. Overall, the impairments of water chemistry and the ecological health in Dongjin-River basin were mainly attributes to point-sources and land-use patterns.

• 한국가정과학회지
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• 제7권1호
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• pp.11-19
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• 2004

Three rice varieties of Nampyong, Dongjin I, Ilmi produced In Naju were examined for cooking properties. The lipid content of Dongjin I and the protein content of Ilmi were higher than those of others. Total amylose contents of three varieties were in range of 16.1$\sim$-18.6% and that of Ilmi were higher than the others. The initial gelatinization temperature by RVA were ranged from 69.8$^\circ$C to 73. 3$^\circ$C. Peak viscosity and breakdown were the highest in Dongjin I but setback was the lowest. Nampyong had the highest value(p

• 한국작물학회지
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• 제29권3호
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• pp.218-226
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• 1984

남부 답다모작지대에 있어서 수도적정시비량을 구명하기 위하여 질소시비량을 10a당 10, 15, 20, 25kg의 4수준, 이앙기를 5월 20일, 6월 5일, 6월 20일, 7월 5일의 4시기로하여 수량구성요소및 수량의 변이를 검토하여 다음과 같은 결과를 얻었다. 1. 난지 도작에 있어서 질소의 적정시비량은 서광벼는 20kg/10a, 동진벼는 15kg/10a 수준이었다. 2. 질소의 적정시비량에서 단위면적당 수수와 등숙률 사이에는 부의 유의 상관관계(서광벼 r =-0.6023＊ 동진벼 r =-0.8581＊＊)가 인정되었다. 3. 시비수준에 따른 1,2차 지경 및 영화의 퇴화율은 서광벼는 질소 25kg/10a 에서, 동진벼는 질소 20kg/10a 이상의 수준에서 컸다. 4. 등숙비율에 있어서 서광벼는 질소증비에 따른 변이가 크지 않았으나 동진벼는 증비에 따른 급격한 등숙비율의 저하 경향을 보여 수량감소의 주요인이 되었다.

• 한국육종학회지
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• 제40권3호
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• pp.295-298
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• 2008

"동진 2호" 품종은 작물과학원 호남농업연구소에서 2005년도에 육성한 중만생 복합내병성 직파적응성 품종으로 주요특성과 수량성을 요약하면 다음과 같다. 1. 출수기는 담수직파와 건답직파에서 8월 16일, 8월 21일로 주안벼보다 3~5일 늦으며, 호남평야지 및 영남평야지 보통기 보비 이앙재배에서는 평균 출수기가 8월 13일로 남평벼보다 3일정도 빠른 중만생종이다. 2. 간장은 70 cm로 남평벼 보다 8 cm 작고 이앙재배에서 주당수수는 남평벼와 같고 수당립수는 많다. 등숙비율은 다소 떨어지고 현미천립중은 24.2 g으로 중립종에 속한다. 3. 도열병에는 중강, 흰잎마름병 및 줄무늬잎마름병에는 강하나 기타 바이러스병이나 멸구 및 매미충류에는 약한 반응을 보였다. 4. 수발아 및 냉수처리 임실율은 남평벼와 비슷하거나 같았으며 냉수시 출수는 3일 지연되었다. 5. 쌀수량은 담수직파에서 571 kg/10a으로 주안벼보다 12%, 건답직파에서 539 kg/10a 으로 7% 증수되었으며 평야지 이앙재배에서는 574 kg/10a으로 6% 증수하였다. 6. 쌀은 심복백이 거의 없으며 투명도는 남평벼 수준으로 맑고 투명하다. 단백질 함량은 남평벼 보다 낮고 제현율과 도정율은 높았다. 7. 동진2호는 충남 이남 평야지(충남, 전남북, 경남북) 이앙재배 및 담수직파재배에 알맞은 품종이다.