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The Analysis of Spectrum on the Barkhausen Noise of Hysteresis Loops on Neutron Irradiated Material
Sim, Cheul-Muu,Chang, Kee-Ok,Park, Kook-Nam,Cho, Man-Soon,Park, Chang-Oong The Acoustical Society of Korea 1999 韓國音響學會誌 Vol.18 No.e1
In relation to a non-destructive evaluation of irradiation damages, the changes in the hysteresis loop and Barkhausen noise amplitude and the harmonics frequency due to a neutron irradiation were measured and evaluated. The Mn-Mo-Ni low alloy steel of RPV was irradiated to a neutron fluence of 2.3 ×10/sup 19/ n/㎠ (E ≥1 MeV) at 288℃. The saturation magnetization of neutron irradiated metal did not change. The neutron irradiation caused the coercivity to increase, whereas susceptibility to decrease. The amplitude of Barkhausen noise parameters associated with the domain wall motion were decreased by a neutron irradiation. The spectrum of Barkhausen noise is analysed with an applied frequency of 4 Hz and 8 Hz, sampling time of 50 μ sec and 20 μ sec. The harmonic frequency shows 4 Hz, 8 Hz, 12 Hz and 16 Hz reflected from an unirradiated specimen. On the contrary, the harmonic frequency disappeared on the irradiated specimen. In addition to the amplitude, the harmonic frequency of Barkhausen noise is taken into accounts as a promising tool for monitoring the irradiation induced degradation of the reactor materials such as a SA508 of PWR-RPV steel and a Zr₄ of HANARO-CNH.
Chang, Ziwei,Lu, Ming,Ma, Yunqi,Kwag, Dong-Geon,Kim, Seo-Hyun,Park, Ji-Min,Nam, Bo-Hye,Kim, Young-Ok,An, Cheul-Min,Li, Huayue,Jung, Jee H,Park, Jang-Su Springer-Verlag ; Springer 2015 Amino acids Vol.47 No.3
<P>Recombinant expression in Escherichia coli allows the simple, economical, and effective production of bioactive peptides. On the other hand, the production of native peptides, particularly those rich in disulfide bonds, is a major problem. Previous studies have reported that the use of carrier proteins for fusion expression can result in good peptide yields, but few are folded correctly. In this study, two transmembrane small proteins in E. coli, YoaJ and YkgR, which both orientate with their N-termini in cytoplasm and their C-termini in periplasm, were used for fusion expression. The recombinant production of two peptides, asteropsin A (ASPA) and 관-defensin (BD), was induced in the periplasm of E. coli using a selected carrier protein. Both peptides were expressed at high levels, at yields of approximately 5-10 mg/L of culture. Mass spectrometry showed that the resulting peptide had the same molecular weight as their natural forms. After purification, single peaks were observed by reversed phase high-performance liquid chromatography (RP-HPLC), demonstrating the absence of isoforms. Furthermore, cytoplasmically expressed fusion proteins with a carrier at their C-termini did not contain disulfide bonds. This study provides new carrier proteins for fusion expression of disulfide bond-rich peptides in E. coli.</P>
Vibrio areninigrae sp. nov., a marine bacterium isolated from black sand.
Chang, Ho-Won,Roh, Seong Woon,Kim, Kyoung-Ho,Nam, Young-Do,Jeon, Che Ok,Oh, Hee-Mock,Bae, Jin-Woo Society for General Microbiology 2008 International journal of systematic and evolutiona Vol.58 No.8
<P>A Gram-negative, facultatively anaerobic, motile, slightly curved rod-shaped bacterial strain was isolated from black sand collected from Soesoggak, Jeju island, Korea. The strain, designated J74T, was able to grow in the presence of 1-7.5 % NaCl, at temperatures of 4-45 degrees C and at pH 5-10. Strain J74T was oxidase- and catalase-positive, arginine dihydrolase-negative and sensitive to the vibriostatic agent O/129. Strain J74T was characterized based on physiology, morphology, biochemical features and 16S rRNA gene sequence analysis. The isolate required sodium ions for growth and utilized a wide range of compounds as sole sources of carbon and energy. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain J74T belongs to the class Gammaproteobacteria. It was found to be associated with the genus Vibrio and was phylogenetically related most closely to the type strain of Vibrio hispanicus (98.7 % 16S rRNA gene sequence similarity). However, DNA-DNA hybridization experiments between strain J74T and V. hispanicus KCTC 12827T revealed a level of relatedness of 37.7 %. Thus, phenotypic and phylogenetic data suggested that J74T should be placed in the genus Vibrio as representing a novel species, for which the name Vibrio areninigrae sp. nov. is proposed. The type strain is J74T (=KCTC 22122T =JCM 14949T).</P>
Study on performance test of orchard tractor power transmission systems
Nam-Seok Sung,Dong-Il Chang,Yun-Kun Huh,Sun-Ok Chung,Jong-Seung Cho,Jong-Kyou Ha 충남대학교 농업과학연구소 2013 농업과학연구 Vol.40 No.3
This study started to export an orchard tractor to Europe under the situations that R&D activities for orchard tractor were marginal and even it was not produced. The R&D for orchard tractor has been progressed and the most of it is accomplishing the goal. In this study, the durability of clutch friction part was tested for F/R clutch and moment of inertia of PTO clutch, and it was compared with the design criteria of transmission of tractor. According to the results of inertia test of F/R clutch, hydraulic pressures of clutch satisfied 1,961.33 ± 196.13 ㎪ of design criteria, and the variations of torque for forward and reverse operation were relatively constant. Therefore, it was found that the durability of clutch friction part was stable and reliable. Test results showed that the main hydraulic pressures were maintained 1,961.33 ± 196.13 ㎪ during the tests of moment of inertia of PTO clutch, and when it was operated, the hydraulic pressures were reached 1,961.33±196.13 ㎪. Therefore, it was found that the hydraulic pressures of PTO satisfied the design criteria. By the results that the time of the hydraulic pressures of PTO reaching main hydraulic pressure, and that of torque values restoring to the original was same as the time of the first gear of PTO reaching the maximum rotational speed, it was found that PTO could transfer power to attachments as it was designed.
Tooth Whitening - What`s the difference, White & Bright?
Nam, Chang-Ok 대한임상예방치과학회 2005 International Journal of Clinical Preventive Denti Vol.1 No.1
On professional tooth whitening, it was effective to use the splint through maximizing activated oxygen and temperature from light irradiation. Temperature increases of 8℃ ~ 10℃ were observed by use of whitening agent and plasma arc light otherwise 13℃ ~ 15℃ increase were revealed by use of the splint with the same agent.