W - Cu 합금의 기계적 성질에 미치는 W 분말입도의 영향

강택규,김태형,이재성,이성,홍문희 대한금속재료학회 1993 대한금속재료학회 학술대회 개요집 Vol.1993 No.0

W-Cu Nanocomposite 의 미세조직과 열물성에 관한연구

강택규,김태형,이재성 한국분말야금학회 1993 한국분말야금학회 학술대회논문집 Vol.1993 No.1

반수체 밀 계통을 이용한 이삭 길이 관련 유전자좌 분석

강택규,김경민,강성욱,강천식,전재범,박철수,조성우 한국육종학회 2020 한국육종학회지 Vol.52 No.2

The objective of this study was to identify quantitative trait loci (QTL) of spike length by association analysis with 94 doubledhaploid wheat lines derived from Keumkang and Olgeuru. Days to heading date, culm length, spike length, and kernels per spike were evaluatedin 2017 and 2018 in upland conditions. Culm length and spike length were biased short culm length and spike length (skewness=0.2 and1.5, respectively). Kernel number per spike was biased low kernel number per spike (skewness=0.8). A genetic map was constructed with170 microsatellite marker loci. One QTL was detected for spike length. The QTL on chromosome 4A, qSL-1 was detected by Xwmc283and Xbarc327 explained 44.3% of the phenotypic variation. The QTL was applied to validate the relationship between genotypes of QTLand 29 Korean wheat cultivars grown for nine years under upland conditions. Korean wheat cultivars were classified into 5 types b ased onthe combination of the two SSR markers. In Korean wheat cultivars, genotype b at Xbarc327, which was homozygous to Keumkang, had ashorter spike length (7.48 cm) than genotype c, which was different from the genotypes of Keumkang and Olgeuru, (8.45 cm). The two Koreanwheat cultivars with genotypes ac at Xwmc283 and Xbarc327 had longer spike length (8.45 cm) than genotypes ba and bb (<7.42 cm).

빵용 밀 품종의 등숙기 질소 시비 시기와 양이 글루텐 분획 및 빵 부피에 미치는 영향

조성우,강택규,박철수,손재한,최창현,정영근,윤영미,김경호,강천식,Cho, Seong-Woo,Kang, Taek-Gyu,Park, Chul Soo,Son, Jae-Han,Choi, Chang-Hyun,Cheong, Young-Keun,Yoon, Young-Mi,Kim, Kyong-Ho,Kang, Chon-Sik 한국작물학회 2018 한국작물학회지 Vol.63 No.3

The purpose of this study was to evaluate the effects of nitrogen fertilization amount and timing of application on protein content, dough properties, change in protein fraction, and bread loaf volume for Korean wheat cultivars, Baekkang, Joongmo2008, and Saekeumkang, for bread with a superior gluten composition during the grain filling stage. Protein content increased with an increase in the amount of N and timing of application. The SDS segmentation volume (SDSS) increased with an increase in N, but there was no effect of the timing of N application on SDSS. An increase in N amount and timing of application caused a difference in dough properties, such as water absorption, mixing time, and tolerance, among the cultivars. Soluble and insoluble polymeric and monomeric protein contents increased with an increase in N amount and timing of application the three Korean wheat cultivars. The effects of N amount and application timing on bread loaf volume (BLV) varied among the cultivars. The BLV of Saekeumkang increased regardless of the N amount and timing of application, but that of Baekkang and Joongmo2008 cultivars was reduced. However, there was a positive correlation between protein content with the addition of N fertilization and BLV. In addition, SDSS, mixing time, and protein fractions were positively correlated with BLV. Since the response of fertilizer conditions was different for each wheat cultivar, it is necessary to build a suitable fertilizing system for each of them. Additionally, since the environment is changing, such as abnormal climate during the maturing period, research is needed to establish appropriate fertilizer conditions for varieties of bread wheat.

Hermetic 마이크로 전자 패키지용 W-Cu 방열재료의 새로운 제조방안

이재성,강택규,김태형 한국마이크로전자및패키징학회 1994 하이브리드마이크로일렉트로닉스 Vol.1 No.2

The present study has proposed that a new manufacturing route of W-Cu heat sink materials for the hermetic microelectronic package can be found by using microhomogeneous W-20wt%Cu composite powders. The thermophysical property of the W-Cu heat sink alloys prepared from the composite powders was discussed in terms of sintered density, microstructure and residual impurity content. In particular, the influence of residual carbon content on the thermal conduction property was emphasized in which the carbon content was controlled by using the various milling agents for powder mixing. It was shown that the thermal conduction property was appreciably improved by the carbon induced oxygen reduction. Consequently, it is concluded that the minimization of residual oxygen content is one of the most important factors enabling the optimum material design of W-Cu heat sinks.

Nanocomposite W-Cu 분말의 승온시 치밀화과정

김태형,강택규,이재성 한국분말야금학회 1994 한국분말야금학회 학술대회논문집 Vol.1994 No.1

국내 장수형 밀 계통을 이용한 수량 관련 양적 형질 유전자좌 분석

강성욱,김경민,강택규,강천식,전재범,박철수,조성우 한국육종학회 2019 한국육종학회지 Vol.51 No.4

Association analysis was conducted to identify quantitative trait loci (QTL) of yield potential traits, days to heading date, culm length, spike length and kernels per spike, in genetic mapping population (94 F10 recombinant inbred line) produced from a cross between two Korean wheat cultivars, Taejoong with a large kernel number line carried with the longer spike length and higher kernel number per spike and Keumkang. Yield potential traits, days to heading date, culm length, spike length and kernels per spike were evaluated in 2017 and 2018 in upland condition. Days to heading date was biased late heading date (skewness=-0.3), and spike length was biased short spike length (skewness=0.7). A genetic map was constructed with 57 microsatellite marker loci and two QTLs were detected for spike length. The first QTL on chromosome 2A, qSL-1 was detected by Xcfd5 and Xpsp3050 and explained 20.7% of phenotypic variation. The second QTL on chromosome 5B, qSL-2 was detected by Xwmc656 and Xwmc415 and explained 40.8% of phenotypic variation. Those QTLs were applied to validate relationship between genotypes of QTL and 29 Korean wheat cultivars cultivated for nine years, from 2010 to 2018. Korean wheat cultivars were classified into 6 types according to the genotypes of Xcfd5-Xpsp3050 and Xwmc656-Xwmc415. The same genotypes to Keumkang showed higher frequency and short spike length than that of Taejoong in Korean wheat cultivars.

국내 보리 품종의 전분 관련 특성 평가

윤영미,김경훈,강택규,강성욱,강혜정,강천식,김양길,박철수,조성우 한국육종학회 2019 한국육종학회지 Vol.51 No.2

Starch properties of 32 Korean barley cultivars (Hordeum vulgare L.) were evaluated to improve the Korean barley breeding program. The average amylose content of non-waxy barley cultivars was approximately 3.5 times higher than that of waxy barley cultivars. Furthermore, non-waxy barley cultivars showed lower damaged starch content, water retention capacity, swelling volume, swelling power, and peak viscosity than waxy barley cultivars, while they showed bigger average starch granule size and higher final viscosity. Among Korean barley cultivars, the amylose content showed a positive correlation with damaged starch content, water retention capacity, swelling volume and power, and peak viscosity, while showing a negative correlation with pasting temperature and final viscosity. Among non-waxy barley cultivars, the amylose content showed a positive correlation with damaged starch content, but correlation with swelling power, peak viscosity, pasting temperature, and final viscosity was negative. Among waxy barley cultivars, the amylose content showed negative correlation with peak viscosity. There were positive correlations between swelling volume and peak viscosity among Korean barley and waxy barley cultivars. Also, there were positive correlations between swelling power and peak viscosity among Korean barley and non-waxy barley cultivars. Principal Components Analysis revealed that amylose content and peak viscosity are the main factors affecting starch properties of Korean non-waxy barley cultivars, and Korean non-waxy barley cultivars can be classified into two groups with these two factors. Water retention capacity and peak viscosity are the main factors affecting starch properties of waxy barley cultivars and classify them into two groups. The starch properties of Korean barley cultivars demonstrated in this study are useful to improve end-use quality for processed foods using barley. In addition, the continuous qualitative evaluation of barley is very important for the Korean barley breeding program.

Cytogenetic Diversity of Korean Hexaploid Wheat (Triticum aestivum L.) with Simple Sequence Repeats (SSRs) by Fluorescence In Situ Hybridization

조성우,강성욱,강택규,박철수,김창수,강천식 한국작물학회 2018 Journal of crop science and biotechnology Vol.21 No.5

Chromosomes of Korean hexaploid wheat were investigated to compare the chromosomal karyotype for cytogenetic diversity. Chromosomal karyotyping was done with in situ hybridization using two types of simple sequence repeats (SSR)s, (AAG)5 and (AAC)5 labeled with tetramethyl-rhodamine-5-dUTP and fluorescein-12-dUPT as a fluorescence, respectively. The two SSRs as cytogenetic markers revealed that the cytogenetic characteristics of the wheat chromosomes were remarkably a B genome. In this study, the chromosomal karyotype of Keumkang, a Korean hexaploid wheat cultivar, was the A, B, and D genomes used as a cytogenetic reference. The expressed signals from the two SSRs showed a difference in the chromosomal karyotype of chromosome 1B among the Korean hexaploid wheat. The distribution pattern and the degree of condensation for the (AAG)5 and (AAC)5 signals on the short arm of chromosome 1B were different in the Korean hexaploid wheat shown in descending order: Keumkang > Joeun > Johan > Olgeuru. Olgeuru had a lower level of distribution and condensation for the two SSRs signals compared to the other Korean hexaploid wheat. In the A genome, chromosome 7A showed an unbalanced expression of the (AAG)5 signal on the distal region of the short and long arms in several Korean hexaploid wheat while Joeun, a Korean hexaploid wheat, showed a definite (AAG)5 signal on the distal region of each arm of chromosome 7A. Among the Korean hexaploid wheat, Shinmichal1, a Korean hexaploid waxy wheat, had a chromosome with a unique expression pattern for (AAG)5 and (AAC)5 compared the other Korean hexaploid wheat. Those cytogenetic differences identified in this study are useful as an indicator to improve the cytogenetic diversity in the Korean wheat breeding program.

국내 밀 집단의 출수일수, 분얼수 및 수량 관련 표지인자 평가

조성우(Seong Woo Cho),강택규(Taek Gyu Kang),강성욱(Seong Wook Kang),강천식(Chon Sik Kang),박철수(Chul Soo Park) 한국육종학회 2018 한국육종학회지 Vol.50 No.3

Molecular markers of doubled-haploid (DH) and long spike Korean wheat cultivar populations were evaluated to improve the yield potential of Korean wheat breeding programs by improving the tiller numbers. In Korean wheat cultivars, the tiller number was affected more by vernalization (Vrn) and photoperiod (Ppd) than by tiller inhibition gene (tin) and fertile tiller inhibition gene (ftin). Also, it was negatively correlated with the yield. In DH lines, the tiller number was significantly affected by neither the tiller inhibition genes nor Vrn and Ppd. Additionally, it was not significantly correlated with the yield. However, the adaptability of both SSR markers, Xgpw2206 and Xgwm247, was higher in the DH lines than in the other populations. In the long spike population, the tiller number differed according to the Ppd-D1 allele, affecting the yield. In this study, genes and molecular markers related to the tiller number, as described in previous studies, might be difficult to use to evaluate the tiller number and yield of the Korean wheat population. Hence, continuous study is necessary to develop molecular markers suitable for improving the tiller number and yield of Korean wheat cultivars.