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김은경 ( Eun-gyeong Kim ),김민경 ( Min-kyung Kim ),권현애 ( Hyun-ae Kwon ),윤도경 ( Do-kyung Youn ),구정헌 ( Jeong-heon Koo ),박소연 ( So-yeon Park ),이희근 ( Hui-geun Lee ),조명희 ( Myeong-hui Jo ),하도윤 ( Do-yun Hah ),김철호 ( 한국동물위생학회(구 한국가축위생학회) 2018 韓國家畜衛生學會誌 Vol.41 No.3
Salmonella Enteritidis (S. Enteritidis) are found in animals, humans, and environment. In addition, S. Enteritidis draws attention to the public health concerns due to carriage of antibiotic resistance traits. For these reasons, the prevalence and antibiotic resistance patterns of S. Enteritidis are significant issues with regard to public health. To address this issues, a total of 24 strains of S. Enteritidis from 164 samples collected from several slaughterhouses in Gyeong-Nam province in order for antibiotic resistance profiles. Subsequently, we characterized the genotyping by random amplification polymorphic DNA (RAPD)-PCR. As a result, very high level of resistance to protein synthesis inhibition antibiotics and most isolates were susceptible to others. Six random primers were used for RAPD-PCR to reveal genotypes of S. Enteritidis isolates. One of the primer, P1245, generated 147 distinct RAPD-PCR fragments ranging from 400∼3000 bp. The number of RAPD-PCR products ranged from 4 to 8 for this primer. The RAPD-PCR fragments could be placed these strains into 3 subgroups and 2 classes by UPGMA cluster analysis. Interestingly, several S. Enteritidis that isolated from different slaughterhouses showed same genotype. These results showed only limited genetic variation among the isolates, those were grouped into a few different patterns of antibiotic resistance.
Hybrid Superconducting Fault Current Limiter of the First Half Cycle Non-Limiting Type
Gyeong-Ho Lee,Kwon-Bae Park,Jungwook Sim,Young-Geun Kim,Il-Sung Oh,Ok-Bae Hyun,Bang-Wook Lee IEEE 2009 IEEE transactions on applied superconductivity Vol.19 No.3
<P>Resistive superconducting fault current limiters (SFCL's) are assumed to be a prospective solution for commercialization. But in spite of excellent current limiting performances realized by resistive SFCL's, commercialization and installation of SFCL's have been delayed due to difficulties in overcoming several technical problems such as a coordination with conventional relays. Resistive SFCL's may have difficulty in controlling an initiation of current limiting operation that sometimes is very important for coordination with relays, because the superconductor in the SFCL will quench immediately after the fault current reaches its critical current. In order to solve these problems, a novel hybrid SFCL of the first half cycle non-limiting type was developed. This paper presents the characteristics of this hybrid SFCL, its configuration and test results.</P>
Lee, Gyeong-Geun,Lee, Yong-Bok,Kwon, Jun-Hyun Korean Nuclear Society 2012 Nuclear Engineering and Technology Vol.44 No.5
The decrease in the fracture toughness of ferritic steels in a reactor pressure vessel is an important factor in determining the lifetime of a nuclear power plant. A surveillance program has been in place in Korea since 1979 to assess the structural integrity of RPV steels. In this work, the surveillance data were collected and analyzed statistically in order to derive the empirical relationship between the embrittlement and strengthening of irradiated reactor pressure vessel steels. There was a linear relationship between the yield strength change and the transition temperature shift change at 41 J due to irradiation. The proportional coefficient was about $0.5^{\circ}C$/MPa in the base metals (plate/forgings). The upper shelf energy decrease ratio was non-linearly proportional to the yield strength change, and most of the data lay along the trend curve of the US results. The transition regime temperature interval, ${\Delta}T_T$, was less than the US data. The overall change from irradiation was very similar to the US results. It is expected that the results of this study will be applied to basic research on the multiscale modeling of the irradiation embrittlement of RPV materials in Korea.
Effect of a sintering process on the electrical properties of SnO2 gas sensors.
Lee, Gyeong-Geun,Kang, Suk-Joong L,Kwon, Junhyun,Kim, Duk Su American Scientific Publishers 2010 Journal of nanoscience and nanotechnology Vol.10 No.1
<P>SnO2 is a widely used sensor material that exhibits high sensitivity. It is known for its complex sensing characteristics, and its microstructure is an important parameter related to electrical properties and mechanical rigidity. Understanding of its microstructural effects is therefore essential to examine sensing mechanisms that may apply to industrial devices. In this work, the effect of a sintering process on the electrical properties is investigated. The sintering temperature and the relative density were chosen as process variables. The grain size of the specimen increased as the sintering temperature increased, whereas the relative density did not change. The apparent activation energy for conduction varied as the compacting pressure and the sintering conditions changed. Samples with a high density and large particle size showed low activation energy for conduction and low sensitivity at 375 degrees C. In an attempt to improve the properties, the powder was heat-treated at 1000 degrees C for 10 hours before compacting and sintering. The samples with heat-treated powder showed a slight decrease in the activation energy depending on the density and comparable sensitivity compared to non-treated powder at a high density. Pre-treatment of powder can be a simple means of thermal stability under high operating temperatures.</P>