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임수근,Junkoo Yi,Jae Jung Ha,박진연,권우성,유대중,Zae Young RYOO,Dae-HyunKim 한국축산학회 2024 한국축산학회지 Vol.66 No.6
The size and location of the corpus luteum and the presence of coexistent follicles are crucial factors in synchronizing recipients and determining the suitability for embryo transfer. However, there has been a recent decline in conception rates after embryo transfer, which is attributed to environmental pollution, uterine inflammation, ovarian cysts, and other factors. Therefore, we conducted experiments to establish a novel criterion for successful embryo transfer assessment. To assess the suitability for embryo transfer one day before transfer, we conducted ultrasound examinations equipped with a vaginal probe to evaluate the corpus luteum and coexistent follicle. We found that instances with corpus luteum and coexistent follicles (diameter: > 10 mm) constituted the majority (69.7%) of cases. When comparing the fertility rates of cases in which the corpus luteum and coexistent follicle (diameter: > 10 mm) were located on the same ovary and cases in which they were not, higher fertility rates were observed when the corpus luteum and coexistent follicle (diameter: > 10 mm) were on different ovaries. Our study revealed a high incidence of corpus luteum and coexistent follicles with a diameter exceeding 10 mm. Therefore, our findings suggest that the co-occurrence of the corpus luteum and a large follicle can serve as a new standard for the evaluation of embryo transfer suitability.
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급냉응고법에 의한 Al-9Zn-2.5Mg-1Cu-X P/M재의 제조 및 성질
임수근 慶尙大學校生産技術硏究所 1990 生産技術硏究所論文集 Vol.6 No.-
Rapidly solidified flakes of 7090 based aluminum alloys containing transition metals were produced by atomizing the alloy melt and subsequent splat quenching onto a water-cooled copper single roll. Consolidation of these flakes was done by cold pressing, degassing and hot extrusion at a reduction ratio of 25 to 1. As splat-quenched flakes showed cellular structure, consisting of primary phase and eutectic. The hardness of flakes and P/M materials increased with the addition of transition metals due to fine dispersion of their eutectic compounds. Mn was most effective for strengthening 7090 based alloy by the addition of transition metals. Tensile strength of T6 materials with 6 wt% Mn addition was 817MPa, and that of 2 wt% Mn addition was 787 Mpa. Furthermore, Mn bearing materials showed appreciably higher specific strength and specific elastic modulus than Ti alloy in room temperature.
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Composite Materials-: SiC 휘스커강화 2024 및 7075 알루미늄합금기 복합재료의 제조와 기계적 특성
임수근,김준수 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.2
Unidirectionally reinforced Al 2024 and Al 7075 composites with SiC whiskers were fabricated by high pressure infiltration technique and subsequent hot extrusion. The microstructure, age hardening behavior and mechanical properties of the composites were examined. Hot extrusion enabled the unidirectional alignment of whiskers, but substantial amount of whiskers was broken during extrusion. The whisker reinforcement tends to accelerate the age hardening, and decrease the amount of aging, due to the inhomogeneous precipitation of stable phases at the lattice defects in the matrix. The beneficial effect of whisker reinforcement was observed up to 473K. Above 573K, however, the mechanical properties of the composite were comparable to those of the unreinforced alloys, attributable to the enhanced grain boundary sliding due to the fine grain structure formed during hot extrusion.
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