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Kim, Jin-Woo,Lee, Yong-Hee,Chae, Sung-Kyu,Min, Sung-Hun,Ahn, Jae-Hyun,Do, Geon-Yeop,Kim, Byung Oh,Park, Humdai,Koo, Deog-Bon The Korean Society of Animal Reproduction 2014 Reproductive & developmental biology Vol.38 No.4
Cows may suffer impaired ovarian function, often accompanied by reduced conception rates and increased embryonic loss. Cystic ovarian disease (COD) is one of the most frequently diagnosed gynecological findings in dairy cattle. It causes temporary infertility and is likely to affect reproduction as well as production parameters in cattle. Therefore, the purpose of this study was to determine the expression patterns of apoptosis (Bcl-2, Bax), implantation (E-cadherin) and immune related proteins (TNF-${\alpha}$, IL-10) in uterine endometrium of Hanwoo (Korean native cattle) with ovarian cyst and normal ovarian follicles. In the Western blot analysis, the expression of anti-apoptotic Bcl-2 protein was significantly higher in endometrium with normal ovarian follicles, whereas expression of pro-apoptotic Bax protein was significantly lower. Also, the expressions of E-cadherin and TNF-${\alpha}$ proteins were significantly higher in uterine endometrium with normal ovarian follicles. On the other hand, the expression of IL-10 protein was significantly lower in uterine endometrium with normal ovarian follicles. Taken together, our results provided that the expressions of apoptosis, adhesion and immune related proteins in uterine endometrium with ovarian cyst were showed the aberrant patterns, and we suggest that different expression changes of these proteins may be affect to pregnancy ability of cattle.
Root cause of thermal sleeve loosening in optimized power reactor 1000 unit 5 and 6 Part (I)
Sang-Gyu Lim,Sung-Yeop Jung,Sang-Nyung Kim 대한기계학회 2008 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.22 No.4
Four of safety injection (SI) nozzles in a 1000 MWe-class Optimized Power Reactor (OPR-1000) are fitted with thermal sleeves (T/S) to alleviate thermal fatigue. Thermal sleeves in #3 and #4 of Younggwang (YGN) & Ulchin (UCN) nuclear power plant are manufactured out of Inconel-600 and fitted solidly without any problem, whereas YGN and UCN in #5 and #6, also fitted with thermal sleeves made of Inconel-690 for increased corrosion resistance, experienced a loosening of thermal sleeves except T/S of YGN #5-1A. To identify the root cause of T/S loosening, three suspected causes were analyzed: (1) the shear force of flow on the T/S when the safety SI nozzle was in operation, (2) the differences between Inconel-600 and Inconel-690 in terms of physical and chemical properties (notably the thermal expansion coefficient), and (3) the positioning error in explosive expansion of the T/S as well as the asymmetric expansion of T/S. It was confirmed that none of the three suspected causes could be considered as the root cause. However, after reviewing the design change history from the Palo Verde nuclear power plant to YGN and UCN #3,4 and #5,6, it was realized that the two stage design modifications (in terms of groove depth & material) made an additional explosive energy required by 172% in aggregate, but the amount of gunpowder and the explosive expansion method were the same as before, resulting in insufficient explosive force that led to poor thermal sleeve expansion. T/S measurement data and rubbing copies also support this conclusion. And the T/S loosening was also attributable to lenient quality control before and after fitting the T/S that resulted in significant uncertainty. In addition, it is our judgment that the acceptance criterion applicable to T/S fitting was not strict enough, failing to single out thermal sleeves that were not expanded sufficiently. Lastly, the acceptance criterion was scientifically revised to incorporate the thinning effect and inherent uncertainties of measurements.
Isolation and proteomic characterization of bacterial extracellular membrane vesicles.
Kim, Gun-Hwa,Choi, Chi W,Park, Edmond C,Lee, Sang-Yeop,Kim, Seung Ii BENTHAM SCIENCE PUBLISHERS 2014 CURRENT PROTEIN AND PEPTIDE SCIENCE Vol.15 No.7
<P>The secretion of extracellular membrane vesicles (EMVs) is a common phenomenon that occurs in archaea, bacteria, and mammalian cells. EMVs contain biologically active proteins, which have diverse roles in biological processes. The outer membrane vesicles (OMVs) of Gram-negative bacteria and membrane vesicles (MVs) of Gram-positive bacteria have been discovered in various species. The main issues related to bacterial EMVs are their virulence, biogenesis mechanisms, host cell interaction mechanisms, and their potential use as new vaccine candidates. Recently, proteomics has become an essential tool for the characterization of EMVs. Proteomics is useful for the identification, quantification, and protein-protein interaction analysis of EMV protein components. This review describes the current understanding of secretory EMVs based on proteomic methods and the characteristics of various bacterial secretory EMVs. Finally, evidence for their potential roles and future applications are discussed.</P>
Kim, Ji-Su,Chung, Sang-Yeop,Stephan, Dietmar,Han, Tong-Seok Elsevier 2019 Construction and Building Materials Vol.202 No.-
<P><B>Abstract</B></P> <P>There are issues on the microstructure characterization of cement paste obtained from μ -CT due to resolution limits, and evaluation of properties through virtual experiments. A phase separation procedure between the solid and pore phases, which can be used for pure cement paste microstructures, is proposed. The problems of underestimation of microstructural characteristics such as porosity in virtual specimens from μ -CT, as compared to real specimens, are addressed. Reflecting such underestimation, the process of input modeling parameter determination for virtual experiments on mechanical property evaluation using the phase field fracture model is elaborated. Through virtual tests, the effects of domain size and mesh resolution on the evaluated properties are investigated, and the correlation between the microstructural characterization parameters and mechanical properties is reconfirmed. It is shown that the virtual experiment framework proposed in this study can be used as a loading tool to supplement time and effort consuming real experiments for evaluating the mechanical properties of cement paste at the micro-scale.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Issues on domain size and resolution of μ-CT images of cement paste are identified. </LI> <LI> Phase separation procedure for μ-CT images of cement paste is extended. </LI> <LI> Phase field fracture model performs adequately as a virtual loading tool. </LI> <LI> Virtual experiment shows a potential to supplement real experiment of cement paste. </LI> </UL> </P>
Kim, Hwang-Pill,Lee, Geon-Ju,Jeong, Hu Young,Jang, Jin-Hyuck,Kim, Gi-Yeop,Choi, Si-Young,Lee, Ho-Yong,Lee, Sang-Goo,Jo, Wook Elsevier 2019 Journal of the European Ceramic Society Vol.39 No.11
<P><B>Abstract</B></P> <P>Relaxor-PbTiO<SUB>3</SUB> piezoelectric single crystals have been of a great interest, since the discovery of ultrahigh piezoresponse demonstrated in <001> -oriented crystals of the composition at the rhombohedral side of morphotropic phase boundary. It has been proposed that the exceptionally large piezoelectric properties should originate from an electric-field-induced polarization rotation that involves a reversible phase transformation between rhombohedral and tetragonal via monoclinic symmetry. However, this commonly accepted polarization rotation mechanism has its limit in explaining still the excellent piezoelectricity even at a small excitation field far below the coercive field. Here, we show by a comparative study using single crystals from two distinct processing techniques, the polarization rotation has, if ever, little influence on the strain properties of <001 > -oriented rhombohedral relaxor-PbTiO<SUB>3</SUB> single crystals. Instead, they may come from a reversible shear-mode piezoelectric contribution from electric-field-susceptible ‘symmetry-bridging’ unit-cell-level phases, the polarization direction of which spans monoclinic symmetry.</P>
Preliminary Design and Implement Plan of Kori Unit 1 Full System Decontamination Project
Sung Hyun Lee,Jung-Hyun Lee,Ju-Hyeon Park,Jeong-Yeop Cha,Seung-Ki Lee,Sung-Su Kim,Chung-Kyu Lee,Ki-Chul Kim 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.2
KEPCO KPS is the contractor for the full system decontamination (FSD) of Kori Unit 1 and under preparation such as modification, lay out for equipment installation, setting up tie-in/out point for chemical injection and way to pressurize the system, of its successful performance. In this research, KPS introduced how KPS has designed and prepared for the FSD project and how will the chemical decontamination process be implemented. As described in the previous research, chemical decontamination process is planned to be conducted for three cycles and each cycle is consisted of oxidation, reduction, decomposition, and purification. Oxidation and reduction process were conducted at 90°C. Chemical decomposition and purification process were conducted at 40°C due to the damage of IX by the heat. If the decontamination result does not meet the target DF and the dose rate, additional cycle can be conducted. Expected volume of process water for FSD is 200 m3. Three systems have been designated as decontamination targets: reactor coolant system (RCS), residual heat removal system (RHRS), chemical volume control system (CVCS). For the steady flow rate, existed plant equipment such as reactor coolant pump (RCP) will be operated and modifications on some components will be conducted. Due to the limited space for installation, decontamination equipment and other resources are distributed to three different places. KPS designed the layout of equipment installed inside the containment vessel. The layout contains the information of shielding for highly radiated equipment such as IX and filter skid.