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Search Results: 1 - 10 of 3340 matches for " Jae-Keun Sohn "
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Effective Procedure for Development of EST-SSR Markers Using cDNA Library  [PDF]
Kyung A Kim, Hee-Cheon Park, Jae-Keun Sohn, Kyung-Min Kim
American Journal of Plant Sciences (AJPS) , 2012, DOI: 10.4236/ajps.2012.39159
Abstract: The present study was conducted to develop EST-SSR markers using the cDNA library from rice plant. Total RNA extracted from the leaves of brown plant hopper resistance gene originated from a rice cultivar “Cheongcheong” and sensitive rice cultivar “Nakdong” were used to synthesize a cDNA library. As a result of analyzing the cDNA library, the 17 EST-SSR primer sets were developed. This study enables to provide effective marker assisted selection (MAS) methods on the selection of white-backed planthopper resistance gene originated from a rice plant more simply, quickly and precisely. Furthermore, using this marker’s advantage of deriving from cDNA, it is possible to identify the white-backed planthopper resistance gene. In addition, this study introduces a technique for construction of a cDNA library safely without using radioactivity.
Physicochemical Characteristics and QTL Mapping Associated with the Lipid Content of High-Lipid Rice  [PDF]
Na-Hye Kim, Jae-Keun Sohn, Kyung-Min Kim
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.410241
Abstract:

This study was conducted to examine the physicochemical characteristics and perform QTL mapping of genetic factors associated with the lipid content of rice. A rice strain with a high lipid content, P31-2-2-2-B-B, was developed from mutants of Dongjin created by T-DNA insertion. The lipid content of P31-2-2-2-B-B brown rice was 4.42% whereas that of the donor cultivar Dongjin was 2.56%. The total fatty acid content of the high-lipid mutant brown rice was 7.82% and that of Dongjin was 3.43%. The unsaturated fatty acid composition of the mutant brown rice was 2.73% oleic acid, 2.74% linoleic acid, and 0.34% linolenic acid. In contrast, the fatty acid composition of the donor cultivar Dongjinwas 1.30% oleic acid and 0.99% linoleic acid. The percentage of unsaturated fatty acid to total fatty acid in the high-lipid mutant was higher

Functional Analysis for Rolling Leaf of Somaclonal Mutants in Rice (Oryza sativa L.)  [PDF]
Young-Hie Park, Hyun-Suk Lee, Gi-Hwan Yi, Jae-Keun Sohn, Kyung-Min Kim
American Journal of Plant Sciences (AJPS) , 2011, DOI: 10.4236/ajps.2011.21008
Abstract: This study was carried out to facilitate the functional analysis of rice genes. Some 297 insertion plants (1.7%) of the entire lines with the endogenous retrotransposon Tos17 were produced. Phenotypes of these plants in the S2 genera-tion were observed in the field according to different leaf types. Rolling leaf mutants showed thinner sclerenchyma-tous cells, defective arrangement of vascular bundles, and well-formed bulliform cells as compared to the parental cultivar. Two new copies of Tos17 were detected in the rolling leaf type. In the new leaf type, the copy number and activation of Tos12, 15 did not appear as ‘Ilpum’. Flanking sequence tag (FST) analysis of Tos17 in the rolling leaf mutant indicated that new copies of Tos17 were transposed on chromosomes 11 and 12. Annotated homologues of the tagging genes on chromosome 11 were arabinoxylan rabinofuranohydrolase isoenzyme AXAH-I and II. The tagging gene in chromosome 12 was highly correlated with 6 kinds of genes including a transcript regulated factor and a rough sheath 2-like protein. This rolling leaf and flanking sequence data will stimulate the functional analysis of rice genes.
Prediction of Microstructure Evolution in Hot Backward Extrusion of Ti-6Al-4V Alloy
Jong-Taek Yeom,Jeoung Han Kim,Jae-Keun Hong,Nho-Kwang Park,Chong Soo Lee
Journal of Metallurgy , 2012, DOI: 10.1155/2012/989834
Abstract: Microstructure evolution of Ti-6Al-4V alloy during hot backward extrusion process was simulated with the combined approaches of finite element method (FEM) and microstructure prediction model. From experimental analysis, it can be found that the change of microstructure during hot forming process of titanium alloy has a close relation to / phase transformation and grain growth behaviour. A microstructure prediction model was established by considering the change of volume fractions and grain size of both phases varying with process variables and then implemented into the user-defined subroutine of FEM analysis. In order to demonstrate the reliability of the model, the volume fraction and grain size of primary phase during the hot backward extrusion process of Ti-6Al-4V alloy were simulated. The simulation results were compared with the experimental ones.
沙尘分析及等离子空气清洁系统沙尘去除效果的评价
LEE Jae-keun, KIM Seong-chan, NOH Hyung-soo, 董旭辉, 狄一安
中国沙漠 , 2003,
Abstract: 本研究对在中国和韩国采集的沙尘的粒径分布及质量浓度进行了测定,使用黄沙标准物质对基于静电沉降原理的等离子空气清洁系统的去除沙尘效率进行了评价。本研究所使用的黄沙采集于北京和汉城,其粒径中值在7.0~80μm之间,浓度范围为300~1462μg·m-3。在单通道测试中,沙尘去除效果随粒径增大和流速降低而增加。系统速度为1.0m·s-1时,去除率大于80%。在27m2的房间中,进行多通道测试时,浓度为300μg·m-3的大气颗粒物仅用10min即可降至150μg·m-3。因此,等离子空气清洁系统能够有效地去除沙尘及保持室内空气质量。
17.6% Conversion Efficiency Multicrystalline Silicon Solar Cells Using the Reactive Ion Etching with the Damage Removal Etching
Ji-Myung Shim,Hyun-Woo Lee,Kyeong-Yeon Cho,Jae-Keun Seo,Ji-Soo Kim,Eun-Joo Lee,Jun-Young Choi,Dong-Joon Oh,Jeong-Eun Shin,Ji-Sun Kim,Ji-Hyun Kong,Soo-Hong Lee,Hae-Seok Lee
International Journal of Photoenergy , 2012, DOI: 10.1155/2012/248182
Abstract: For lower reflectance, we applied a maskless plasma texturing technique using reactive ion etching (RIE) on acidic-textured multicrystalline silicon (mc-Si) wafer. RIE texturing had a deep and narrow textured surface and showed excellent low reflectance. Due to plasma-induced damage, unless the RIE-textured surfaces have the proper damage removal etching (DRE), they have a drop in oc and FF. RIE texturing with a proper DRE had sufficiently higher short circuit current (sc) than acidic-textured samples without a drop in open circuit voltage (oc). And in order to improve efficiency of mc-Si solar cell, we applied RIE texturing with optimized DRE condition to selective emitter structure. In comparison with the acidic-textured solar cells, RIE-textured solar cells have above 200 mA absolute gain in Isc. And optimized RIE samples with a DRE by HNO3/HF mixture showed 17.6% conversion efficiency, which were made using an industrial screen printing process with selective emitter structure.
Efficacy of Single Dose of a Bivalent Vaccine Containing Inactivated Newcastle Disease Virus and Reassortant Highly Pathogenic Avian Influenza H5N1 Virus against Lethal HPAI and NDV Infection in Chickens
Dong-Hun Lee, Jae-Keun Park, Jung-Hoon Kwon, Seong-Su Yuk, Tseren-Ochir Erdene-Ochir, Yo-Han Jang, Baik-Lin Seong, Joong-Bok Lee, Seung-Yong Park, In-Soo Choi, Chang-Seon Song
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0058186
Abstract: Highly pathogenic avian influenza (HPAI) and Newcastle disease (ND) are 2 devastating diseases of poultry, which cause great economic losses to the poultry industry. In the present study, we developed a bivalent vaccine containing antigens of inactivated ND and reassortant HPAI H5N1 viruses as a candidate poultry vaccine, and we evaluated its immunogenicity and protective efficacy in specific pathogen-free chickens. The 6:2 reassortant H5N1 vaccine strain containing the surface genes of the A/Chicken/Korea/ES/2003(H5N1) virus was successfully generated by reverse genetics. A polybasic cleavage site of the hemagglutinin segment was replaced by a monobasic cleavage site. We characterized the reverse genetics-derived reassortant HPAI H5N1 clade 2.5 vaccine strain by evaluating its growth kinetics in eggs, minimum effective dose in chickens, and cross-clade immunogenicity against HPAI clade 1 and 2. The bivalent vaccine was prepared by emulsifying inactivated ND (La Sota strain) and reassortant HPAI viruses with Montanide ISA 70 adjuvant. A single immunization with this vaccine induced high levels of hemagglutination-inhibiting antibody titers and protected chickens against a lethal challenge with the wild-type HPAI and ND viruses. Our results demonstrate that the bivalent, inactivated vaccine developed in this study is a promising approach for the control of both HPAI H5N1 and ND viral infections.
Multiresolution Expansion and Approximation Order of Generalized Tempered Distributions
Byung Keun Sohn
International Journal of Mathematics and Mathematical Sciences , 2013, DOI: 10.1155/2013/190981
Abstract:
Multiresolution Expansion and Approximation Order of Generalized Tempered Distributions
Byung Keun Sohn
International Journal of Mathematics and Mathematical Sciences , 2013, DOI: 10.1155/2013/190981
Abstract: Let be the generalized tempered distributions of -growth with restricted order , where the function grows faster than any linear functions as . We show the convergence of multiresolution expansions of in the test function space of . In addition, we show that the kernel of an integral operator provides approximation order in in the context of shift-invariant spaces. 1. Introduction Multiresolution analysis was shown to be very useful in extending the expansions in orthogonal wavelets from to a certain class of tempered distributions. Some interactions between wavelets and tempered distributions have been presented by Walter’s work in [1–3]. Walter has found the analytic representation of tempered distributions of polynomial growth with restricted order, , by wavelets [1] and the multiresolution expansions’ pointwise convergence of [3]. Pilipovi? and Teofanov have showed the uniform convergence on compact sets of the derivatives of multiresolution expansions of and the convergence of multiresolution expansions of in the test function space of . As an application, Pilipovi? and Teofanov have shown that the kernel of an integral operator provides approximation order in in the context of shift-invariant spaces [4]. In the meantime, the tempered distributions of polynomial growth were extended to tempered distributions of -growth, , in [5, 6] and -growth, , in [7, 8] or -growth, , in [9, 10], where the function grows faster than any linear functions as . We have considered the analytic representation of tempered distributions of -growth with restricted order, , by wavelets [11]. Also, we have shown that the multiresolution expansions of converges pointwise to the value of the distribution where it exists [12]. In this paper, we will show the uniform convergence on compact sets of the derivatives of multiresolution expansions of and convergence of multiresolution expansions of in the test function space of . In addition, we will show that the kernel of an integral operator provides approximation order in . This is an extension of the works of Pilipovi? and Teofanov [4] in the context of generalized tempered distributions, . 2. The Generalized Tempered Distribution Spaces Throughout this paper, we will use or to denote the positive constants, which are independent parameters and may be different at each occurrence. Let denote a continuous increasing function such that and . For , we define The function is an increasing, convex, and continuous function with and satisfies the fundamental convexity inequality . Further, we define for negative by means of the
Cauchy and Poisson Integral of the Convolutor in Beurling Ultradistributions of -Growth
Byung Keun Sohn
International Journal of Mathematics and Mathematical Sciences , 2014, DOI: 10.1155/2014/926790
Abstract: Let be a regular cone in and let be a tubular radial domain. Let be the convolutor in Beurling ultradistributions of -growth corresponding to . We define the Cauchy and Poisson integral of and show that the Cauchy integral of?? is analytic in and satisfies a growth property. We represent?? as the boundary value of a finite sum of suitable analytic functions in tubes by means of the Cauchy integral representation of . Also we show that the Poisson integral of corresponding to attains as boundary value in the distributional sense. 1. Introduction Let be a regular cone in and let denote its convex envelope. In [1] (or [2]) Carmichael defined the Cauchy and Poisson integrals for Schwartz distributions , , corresponding to tubular domain . Carmichael obtained the boundary values of these integrals in the distributional sense on the boundary of and found the relation between analytic functions with a specific growth condition in and the Cauchy and Poisson integrals of their distributional boundary values. In [3] Pilipovi? defined ultradistributions of -growth, where , , is a certain sequence of positive numbers, and studied the Cauchy and Poisson integrals for elements of in the case that the Cauchy and Poisson kernel functions are defined corresponding to the first quadrant ; , in . Pilipovi? showed that elements in are boundary values of suitable analytic functions with a certain -norm condition by means of the Cauchy integral representation and an analytic function with a certain -norm condition determines, as a boundary value, an element from . In [4] Carmichael et al. defined ultradistributions of Beurling type of -growth and of Roumieu type of -growth, both of which generalize the Schwartz distributions , and studied the Cauchy and Poisson integrals for elements of both and for corresponding to the arbitrary tubes where is an open connected cone in of which the quadrants are special cases. They showed that the Cauchy integral for elements of both and for corresponding to is shown to be analytic in , to satisfy a growth property and to obtain an ultradistribution boundary value, which leads to an analytic representation for the ultradistributions. They also showed that the Poisson integrals for elements of both and for corresponding to are shown to have an ultradistribution boundary value. We can find the works of the Cauchy and Poisson integrals for ultradistributions of compact support in [5] and for various kinds of distributions in [2]. In the meantime, Betancor et al. [6] introduced the spaces of Beurling ultradistributions of -growth, , of which
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