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신화랑(Hwa-Rang Shin),이동윤(Dong-Yun Lee),홍원표(Won-Pyo Hong) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
Machine Capability Index(Cmk) is the mechanical ability of equipment to evaluate the stable production capability. In this paper, Machine Capability Index of the machining center has been evaluated by using CMM(Coordinate Measuring Machine) measuring data of machined workpieces.
Hosub Shin,Hye Rang Park,Jeong Eun Park,Seung Hwa Yu,Gibum Yi,Jung Hyo Kim,Wonjun Koh,김현희,Soo-Seong Lee,허진호 한국유전학회 2021 Genes & Genomics Vol.43 No.3
Background Hybridization and polyploidization events are important driving forces in plant evolution. Allopolyploids formed between diferent species can be naturally or artifcially created but often sufer from genetic instability and infertility in successive generations. xBrassicoraphanus is an intergeneric allopolyploid obtained from a cross between Brassica rapa and Raphanus sativus, providing a useful resource for genetic and genomic study in hybrid species. Objective The current study aims to understand the cause of hybrid sterility and pollen abnormality in diferent lines of synthetic xBrassicoraphanus from the cytogenetic perspective. Methods Alexander staining was used to assess the pollen viability. Cytogenetic analysis was employed to monitor meiotic chromosome behaviors in pollen mother cells (PMCs). Origins of parental chromosomes in xBrassicoraphanus meiocytes were determined by genome in situ hybridization analysis. Results The xBrassicoraphanus lines BB#4 and BB#6 showed high rates of seed abortion and pollen deformation. Abnormal chromosome behaviors were observed in their PMCs, frequently forming univalents and inter-chromosomal bridges during meiosis. A positive correlation also exists between meiotic defects and the formation of micronuclei, which is conceivably responsible for unbalanced gamete production and pollen sterility. Conclusion These results suggest that unequal segregation of meiotic chromosomes, due in part to non-homologous interactions, is responsible for micronuclei and unbalanced gamete formation, eventually leading to pollen degeneration and inferior fertility in unstable xBrassicoraphanus lines.
신화랑(Hwa-Rang Shin),홍원표(Won-Pyo Hong) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
SEM is very useful measuring equipment in micro and nano area. In generally, it has shown the limited measuring area about few micro meters, and is unsuitable for the accurate measurement above several tens of micro meters. This paper proposed the stitching algorithm of electron beam split image using image processing technique. Finally stitching accuracy has been verified by comparing with AFM measuring data.
Rhew, Jung-Hwa,Shin, Young-Ah,Lee, Byung-Heon,Park, Rang-Woon,Kim, In-San 경북대학교 의학연구소 2000 경북대학교병원의학연구소논문집 Vol.4 No.1
Two intracellular signal pathways mediated by CAMP and protein kinase C (PKC) were involved in the regulation of FN gene expression (Lee et al., Exp. Mol. Med. 30: 240, 1998). In this study, a possible involvement of protein phosphatase-dependent pathways in the regulation of FN gene expression was investigated by using protein phosphatase type 2B (PP2B) inhibitors, cyclosporin A and ascomycin. Both cyclosporin A and ascomycin increased the levels of FH mRNA in Wl-38 human lung fibroblasts and the SV40-trans formed Wl-38 cells but not in MC3T3-E1 osteoblasts. The expression of FN appears to increase from six hours up to 48 hours after treatment suggesting that it is not an immediate effect. In addition, this effect required a new protein synthesis. Neither cyclosporin A nor ascomycin affects the phorbol myristate acetate (PMA)-induced stimulation of FN gene expression and the same result occurred in vice versa suggesting the mechanism of PMA and cyclosporin A/ascomycin in the regulation of FN gene expression may share a common downstream pathway. Taken together, thins study suggests that PP2B is involved in the regulation of FN gene expression in normal and transformed fibroblasts but not in osteoblasts.