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Seongjun Kim,Sunggil Kim 한국육종학회 2015 한국육종학회 심포지엄 Vol.2015 No.07
For efficient introgression of the downy mildew resistance gene from a resistant cultivar into domestic breeding lines, molecular markers used for marker-assisted backcrossing (MAB) were developed in onion (Allium cepa L.). The resistance gene (Pd) was originally introgressed from a wild species, A. roylei, by interspecific hybridization, and the resistant gene was known to be positioned at the end of chromosome 3. Therefore, cDNA sequences of loci located at the ends of chromosome 3 of two linkage maps were obtained from a transcriptome database. Primer pairs were designed on exon sequences of eight loci. Among them, the PCR products of the i25255 locus showed length polymorphism between A. roylei and onions, and both large and small-sized PCR products were observed in the resistant cultivar. Sequence analysis showed that a 67-bp indel existed in the intron sequences. Based on this indel polymorphism, a simple PCR marker, designated DMR1, was developed. Analysis of diverse onion accessions showed that no accessions contained the A. roylei-specific marker genotype except for the resistant cultivar. These results indicated that the DMR1 marker was successfully tagging the A. roylei fragment harboring the downy mildew resistance gene, and the resistant cultivar was heterozygous for the resistance gene. After further analysis of multiple loci positioned at chromosome 3, a range of the A. roylei fragment introgressed in the resistant cultivar was determined in two linkage maps. On the basis of the range of the A. roylei fragment, three molecular markers used for recombinant selection in MAB were also developed.
Carrier transport mechanism of Al contacts on n-type 4H-SiC
Kim, Seongjun,Kim, Hong-Ki,Jeong, Seonghoon,Kang, Min-Jae,Kang, Min-Sik,Lee, Nam-Suk,Cuong, Tran Viet,Koo, Sang-Mo,Kim, Hyunsoo,Shin, Hoon-Kyu Elsevier 2018 Materials letters Vol.228 No.-
<P><B>Abstract</B></P> <P>We investigated the carrier transport mechanism at Al/n-type 4H-SiC contacts. As-deposited Al exhibited the good ohmic behavior, while the thermal annealing leads the significant degradation of contact properties, i.e., the specific contact resistance was 3.97 × 10<SUP>−3</SUP>, 4.1 × 10<SUP>−2</SUP>, and 0.153 Ω cm<SUP>2</SUP> for the as-deposited, 200 and 400 °C-annealed condition, respectively. The ohmic mechanism of as-deposited contact could be explained by field emission model, yielding a tunneling parameter of 0.44 eV, i.e., the ohmic behavior is due to the tunneling through the thin barrier. The degradation of ohmic contact after thermal annealing caused by the formation of oxide layer between the Al and SiC.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We proposed an use of aluminum as a contact metal to form ohmic contact without thermal annealing process. </LI> <LI> The Al/n-type 4H-SiC contact showed an ohmic behavior without thermal annealing. </LI> <LI> The as-deposited contact could be explained by field emission model. </LI> <LI> The thermal annealing led to the degradation of ohmic behavior due to the generation of interfacial oxide. </LI> </UL> </P>
Flora of a Cool Temperate Forest Around Restoration Center for Endangered Species, Yeongyang
Kim, Seongjun,Lee, Chang-Woo,Park, Hwan-Joon,Lee, Byoung-Doo,Hwang, Jung Eun,An, Jiae,Park, Hyung Bin,Baek, Ju Hyeong,Kim, Pyoung Beom,Kim, Nam Young National Institute of Ecology 2021 국립생태원회보(PNIE) Vol.2 No.1
The present study aimed to clarify flora living at the area of Restoration Center for Endangered Species in Yeongyang, Gyeongbuk Province. In May, August, and September 2019 and in May and July 2020, all of vascular plants were recorded, and endangered, Korea endemic, and exotic plant species were further identified. The study site contained a total of 418 floral taxa (98 families, 261 genera, 384 species, 4 subspecies, 27 variations, and 3 formations), in which Magnoliophyta accounted for larger proportion (95.2%) than Pteridophyta (3.6%) and Pinophyta (1.2%). In addition, 1 endangered (Cypripedium macranthos Sw.) and 5 Korea endemic species (Aconitum pseudolaeve Nakai, Eleutherococcus divaricatus var. chiisanensis [Nakai] C.H. Kim & B.-Y. Sun, Lonicera subsessilis Rehder, Paulownia coreana Uyeki, and Weigela subsessilis [Nakai] L.H. Bailey) were detected. The number of exotic species was 33, consisting of 4 invasive-exotic, 4 potentially invasive-exotic, and 25 non-invasive species. Compared to a previous assessment before the establishment of the center (in 2014), there were increases in total floral taxa (from 361 to 418), endangered species (from 0 to 1), and exotic species (from 26 to 33). These results possibly reflect temporal changes in floral community, which should be confirmed through subsequent long term monitoring.
김성준(Seongjun Kim),김현재(Hyunjae Kim),김현진(Hyun Jin Kim) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.2
For large reciprocating compressors in parallel operation, an analytical study has been carried out on the gas pulsation in associated discharge piping lines. Since the pressure pulsation at a valve, valve dynamics, and the gas flow rate through the valve are interrelated, affecting one another, these need to be solved simultaneously. Acoustic transfer matrix method, which relates acoustic pressure and velocity at one location to those at another location, has been adopted to calculate the effect of the gas flow at one valve location on the gas pulsation at other valve locations.
김성준(Seongjun Kim),김현진(Hyun Jin Kim),김영민(Young-Min Kim) 대한설비공학회 2009 설비공학 논문집 Vol.21 No.2
Conceptual design of scroll expander and scroll compressor for 10 ㎾-class Stirling engine utilizing solar energy as heat source has been carried out to estimate the applicability of scroll mechanism for Stirling cycle. CO2 was chosen as working fluid, since it has lower expansion index and higher density among probably usable gases. Gas temperature at the expander inlet was sel at 700℃, and that at the compressor inlet was at 40℃. System efficiency reached maximum at the pressure ratio of about 2.5. and the peak efficiency increased with increasing high side pressure. Due to safety concern, the pressure condition of 6 ㎫/2.5 ㎫ was chosen as design condition. Orbiting scroll members for the expander and compressor were designed to have double-sided structure in order to reduce the overall scroll size and to cancel out the axial gas forces acting on the orbiting scroll base plate- By parametric study on the scroll profile, smaller possible size for the scroll members was obtained. With the shaft speed of 3600 rpm, the shaft output of the designed scroll expander was calculated to be 45.4 ㎾, while input power for the scroll compressor was 34.5 ㎾, yielding 10.9 ㎾ for the output power of the Stirling engine. System efficiency was estimated to be about 7.3%, and overall efficiencies of the scroll expander and compressor were around 84.1% and 88.3%. respectively.