• Journal of Life Science
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• v.14 no.5
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• pp.821-828
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• 2004

The increasing apparent photosynthetic rate per leaf area may improve seed yield in soybean. Leaf area, length and width are related to the photosynthetic capability of the plant. In this study, two populations derived from the cross of Keunolkong, Shinpaldalkong and Iksanl0 were evaluated with simple sequence repeat (SSR) markers to identify length, width and length/width ratio of leaf. Leaf length/width ratio were significantly negative correlation with leaf width in K/S and K/I populations. In the K/S population, two minor QTLs for leaf length (LL) were found on LG Dlb+W and 1. Two QTLs on LG J and L were related to LL in K/I population. Two and three minor QTLs were identified in leaf width with total phenotypic variation of 13% and 18.04 in K/S and K/I populations, respectively. The leaf length/width ratio, two QTLs on LG I and L, and three QTLs on LG Cl, E and L were related to K/S and K/I populations, respectively. Thus it is assumed that the leaf traits are very much dependent on the genotype used and different breeding approach should be considered for the selection of favorite leaf traits in soybean breeding programs.

• Spatial Information Research
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• v.18 no.4
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• pp.1-11
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• 2010

Unlike the previous studies which have focused on 2-dimensional urban characteristics, this paper presents statistical models explaining urban heat island(UHI) effect by 3-dimensional urban morphologic information and addresses its policy implications. 3~dimensional informations of Columbus, Ohio arc captured from LiDAR data and building boundary informations are extracted from a building digital map, Finally NDV[ and temperature data are calculated by manipulating band 3, band 4, and thermal hand of LandSat images. Through complicated data processing, 6 independent variables(building surface area, building volume, height to width ratio, porosity, plan surface area) are introduced in simple and multiple linear regression models. The regression models are specified by Box-Tidwell method, finding the power to which the independent variable needs to raised to be in a linearity. Porosity, NDVI, and building surface area are carefully chosen as explanatory variables in the final multiple regression model, which explaining about 57% of the variability in temperatures. On reducing UHI, various implications of the results give guidelines to policy-making in open space, roof garden, and vertical garden management.

• Journal of Korea Port Economic Association
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• v.31 no.1
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• pp.1-14
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• 2015

The standard GARCH model imposing symmetry on the conditional variance, tends to fail in capturing some important features of the data. This paper, hence, introduces the models capturing asymmetric effect. They are the EGARCH model and the GJR model. We provide the systematic comparison of volatility models focusing on the asymmetric effect of news on volatility. Specifically, three diagnostic tests are provided: the sign bias test, the negative size bias test, and the positive size bias test. This paper shows that there is significant evidence of GARCH-type process in the data, as shown by the test for the Ljung-Box Q statistic on the squared residual data. The estimated unconditional density function for squared residual is clearly skewed to the left and markedly leptokurtic when compared with the standard normal distribution. The observation of volatility clustering is also clearly reinforced by the plot of the squared value of residuals of export volume and values. The unconditional variance of both export volumes and export value indicates that large shocks of either sign tend to be followed by large shocks, and small shocks of either sign tend to follow small shocks. The estimated export volume news impact curve for the GARCH also suggests that $h_t$ is overestimated for large negative and positive shocks. The conditional variance equation of the GARCH model for export volumes contains two parameters ${\alpha}$ and ${\beta}$ that are insignificant, indicating that the GARCH model is a poor characterization of the conditional variance of export volumes. The conditional variance equation of the EGARCH model for export value, however, shows a positive sign of parameter ${\delta}$, which is contrary to our expectation, while the GJR model exhibits that parameters ${\alpha}$ and ${\beta}$ are insignificant, and ${\delta}$ is marginally significant. That indicates that the asymmetric volatility models are poor characterization of the conditional variance of export value. It is concluded that the asymmetric EGARCH and GJR model are appropriate in explaining the volatility of export volume, while the symmetric standard GARCH model is good for capturing the volatility.

• Korean journal of applied entomology
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• v.35 no.3
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• pp.209-215
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• 1996

DNA polymorphisms were analyzed for 8 clones of the green peach aphid, Myzus persicae Sulzer, by random amplified polymorphic DNA-polymerase chain reaction (RAPD-PCR). The insect has different host preferences and was even classified into two different species, M. persicae Sulzer and Myzus nicotinae Blackman by their morphological characters, but this point is still in arguement. To identify the differences between two types of the green peach aphid by RAPD-PCR, the template DNA was extracted from 4 clones each of tobacco-feeding and non-tobacco-feeding forms and one hundred primers of 10-nucleotideslong were tested in PCR. The amplified DNAs were analyzed by agarose gel electrophoresis. Eighty-three primers gave amplified DNA fragments with 1 to 22 in number and 500 to 20,000 base pairs in length, but no amplification was observed in the other 17 primers. The average number of fragment per each amplification was about 13. In the case of 82 out of 83 random primers, band patterns of amplified DNA were identical among 8 clones, even though some differences were noticed in the intensity of specific bands. Polymorphism was detected by only one primer within the tobacco-feeding forms, but not between the two host types. The results did not detect any relationship between RAPD polymorphism and their host preference.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.50 no.spc1
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• pp.108-111
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• 2005

Studies were conducted to develop new breeding resources using wild soybean (Glycine soja Sieb. & Zucc.) species. In 132 wild soybeans, the average crude protein content was $45.4\%$, ranged from $37.4\%\;to\;50.2\%$ and average crude oil content was $9.3\%$ showing lower than cultivated soybean. The average total amino-acids content was $19,214\;{\mu}g/g$, containing $252\;{\mu}g/g$ of methionine and $103\;{\mu}g/g$ of cysteine, a sulfur containing amino-acid. In ratio of individual amino-acids, the glutamic acid, methionine and cystein content was $16.1\%,\;1.3\%,\;and\;0.5\%$, respectively. The correlation between total amino-acid and sulfur containing amino-acid was not significant. Total isoflavone concentration was, on average, $1,105\;{\mu}g/g$ in wild soybean germplasm. As a result of comparison with total isoflavone and genestein contents, significant positive correlations were observed between total isoflavone and genistein concentration.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.50 no.spc1
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• pp.118-122
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• 2005

This study was carried out to obtain useful information and to select promising materials for the breeding of sprout-soybean by the analysis of seed characteristics and chemical composition of Korean local wild soybean lines. For this purpose, crude protein, crude oil contents and fatty acid composition of 70 lines analysed. The crude protein content of Korean wild soybean lines ranged from 35.6 to $47.9\%$, mean was $42.34\%$, and 13 lines showed high protein content over $45\%$. The crude oil content of those ranged from 2.8 to $18.0\%$, mean was $10.2\%$, and 2 low lines were below $2\%$. The fatty acid 16:0, 18:0, 18:1, 18:2, 18:3 ranged $11.1-44.6\%,\;3.0-11.4\%,\;11.1-30.6\%,\;12.4-59.5\%,\;and\;1.1-17.3\%$ respectively, and 2 extremely low fatty acid(18:3) lines were selected. Significant correlation between crude oil and fatty acids(16:0, 18:0, 18:2), and among every fatty acid compositions were recognized. Promising wild soybean lines were selected as genetic resources for sprout-soybean breeding and research genotypes; YWS 104 and YWS189 as the high protein, YWS 28 and YWS30 as the low-crude oil and low 18:3.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.47 no.3
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• pp.250-253
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• 2002

The post harvest treatment of barley had many hard work steps, such as drying, cleaning, and packing. This is a reason why farmer doesn't like to cultivate barley. This study was conducted to investigate the optimum post harvest management of bulk-harvested barley using rice processing complex (RPC). Bulk-harvested barley was stored to 61.1% after 6pm at RPC. Grain moisture contents of bulk-harvested barley differed from storing date, farmer household, and field. Required dry hours were different with grain moistures contents. The average dry hour was 9.5 hours per 10a and dry rate was 0.89%. The proportion of impurity removed by coarse cleaning differed from grain moisture contents, as higher grain moisture content made impurity rate increase up to 38.9%. Cost of drying of bulk-harvested barley was 50won per ㎏ at above 24% of grain moisture contents, and the average dry cost was 41.25 won/㎏ and 14,400won/10a. The 62% of barley treated was stored in indoor-grain bin, and the others packed in 500 ㎏-poly con bag were stored in warehouse insulated.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.1 no.1
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• pp.36-41
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• 1963

10 of Korean domestic recommended varieties(all of them are determinate type) and 10 of introduced varieties from U.S.A.(All of them are indeterminate type) are grown in replicated field in order to clarify the varietal differences in the days from planting to blooming to ripening. The results are summarized as follows; 1. Domestic varieties showed remarkable shortday sensibility for the days from planting to blooming. The difference in sensibility between domestic and introduced was significant while within the domestic group the differences were not significant. 2. The days from planting to blooming were linearly shortened in accordance with the delayed planting from the late April through the late June. 3. Annual variation in days from planting to blooming was not noticeable in the domestic varieties while the introduced ones showed remarkably. 4. The days from blooming to ripening were significantly shortened for the introduced varieties but not significantly for the domestic varieties accordingly with the delayed planting. The mean shortest days of domestic varieties were longer than the mean shortest days of introduced varieties. 5. The days from planting to blooming was shortest when a variety was grown during early August through middle September (with 12.5~13.5 hrs day length and 22~$27^{\circ}C$ temperature), and the days from blooming to ripening were also shortest when a variety was matured within same duration. These were true for the varieties of both groups.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.31 no.1
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• pp.49-55
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• 1986

To obtain basic information required for improving grain yield of the two modified opaque-2 synthetics, which have been developed at College of Agr., Chungnam National Univ. in 1980 and named as Puyo No.2 and No.3, physical kernel characteristics of the two synthetics were fully investigated and results obtained are as follows: Puyo No.2 synthetics had a smaller kernel size with lighter weight than the Puyo No.3. The Puyo No.2 synthetics had higher kernel density than the Puyo No.3 with large Kernel size. The Puyo No.2 had kernels with heterogenous endosperm phenotypes. Some kernels had mottled patches on endosperm, while other kernels 1/2 and 1/2 phenotypes. All the modified opaque-2 synthetics had somewhat lighter endosperm weight than the normal check hybrid. The Puyo No.2 synthetics with smaller kernel size had more germ portion compared with large kernel, Puyo No.3. The Puyo No.2 had shown also typical endosperm texture when observed under microscope after cutting by glass knife. The lysine content of the Puyo No.2 was higher than those of other varieties studied. Breeding schemes to improve the yield capacity of the two modified opaue-2 synthetics were discussed.

• Horticultural Science & Technology
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• v.32 no.4
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• pp.525-534
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• 2014

Microsatellite markers were used to identify 58 major commercial melon cultivars, and to assess hybrid seed purity of a melon breeding line known as '10H08'. A set of 412 microsatellite primer pairs were utilized for fingerprinting of the melon cultivars. Twenty-nine markers showed hyper-variability and could discriminate all cultivars on the basis of marker genotypes, representing the genetic variation within varietal groups. Cluster analysis based on Jaccard's distance coefficients using the UPGMA algorithm categorized 2 major groups, which were in accordance to morphological traits. The DNA bulks of female and male parents of breeding line '10H08' were tested with 29 primer pairs based on microsatellites to investigate purity testing of $F_1$ hybrid seeds, and 5 primer pairs exhibited polymorphism. One microsatellite primer pair (CMGAN12) produced unambiguous polymorphic bands among the parents. Among 192 seeds tested with CMGAN12, progeny possibly generated by self-pollination of the female parent were clearly distinguished from the hybrid progeny. These markers will be useful for fingerprinting melon cultivars and can help private seed companies to improve melon seed purity.