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김강용,Pantu Kumar Roy,Xun Fang,Bahia MS Hassan,조종기 대한수의학회 2019 Journal of Veterinary Science Vol.20 No.3
This study examined the effects of a caffeine treatment to improve nuclear reprogramming in porcine cloned embryos. Embryonic development and the expression of genesrelated to pluripotency (POU5F1, SOX2, NANOG, and CDX2) were compared after caffeine supplementation during manipulation at different concentrations (0, 1.25, 2.5, and 5.0 mM) and after varying the delayed activation time (control, 1, 2, and 4 h) after fusion. Caffeine added to media during manipulation produced a higher rate of development to blastocysts in the 1.25 mM group than in the other concentration groups (22.8% vs. 16.1%, 16.2%, and 19.2%; p < 0.05). When caffeine was added during the 4 h delayed activation, the 1.25 mM caffeine concentration produced a significantly higher rate of development than those inthe other 4 h-activation-delayed caffeine concentration groups (22.4% vs. 9.4%, 14.0%, and 11.1%; p < 0.05). On the other hand, no significant improvement over that in thecontrol group was observed when caffeine was supplemented during both the manipulation period and delayed activation period (16.0% vs. 15.2%), respectively. The levels of POU5F1, SOX2, and NANOG expression in blastocysts were significantly higher in the delayed activation caffeine group (4 h, 1.25 mM) than in the control group (1 h, 0 mM; p < 0.05). In conclusion, a caffeine treatment at 1.25 mM during delayed activation for 4 h can improve the preimplantation development of porcine somatic cell nuclear transfer embryos by activating nuclear reprogramming.
Synthesis of nano-sized urchin-shaped LiFePO<sub>4</sub> for lithium ion batteries
김강용,김현중,박종남 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
In this article, the facile synthesis of sea urchin-shaped LiFePO<sub>4</sub> nanoparticles by thermal decomposition of metal-surfactant complexes and application of these nanoparticles as a cathode in lithium ion secondary batteries is demonstrated. The morphology of LiFePO<sub>4</sub> particles could be regulated by the injection of oleylamine, with other surfactants and phosphoric acid. This injection step was critical to tailor the morphology of LiFePO<sub>4</sub> particles, converting them from nanosphere shapes to diverse types of urchin-shaped nanoparticles. An electron microscopy analysis observation revealed that numerous thin nanorods ranging from 5 to 20 nm in diameter were attached to the nanoparticles. The hierarchical nanostructure of these urchin-shaped LiFePO<sub>4</sub> particles mitigated the low tap density problem. In addition, the nanorods less than 20 nm attached to the edge of urchin-shaped nanoparticles significantly increased the pathways for electronic transport.
선박 초기화재 진화용 소방 펌프 성능 향상에 관한 연구
김강용(Kim Kang Yong),탁봉열(Tak Bong Yul),한기영(Han Gi Young),정훈(Jung Hun) 한국마린엔지니어링학회 2005 한국마린엔지니어링학회 학술대회 논문집 Vol.2005 No.-
미수분무 소화장치의 IMO 규격이 대폭 강화되어, 미수분무 소화장치에 공급되는 소화수의 용량 증대, 압력증가 등이 예상되어 그에 필요한 대형 고압 피스톤 펌프 개발이 필요하게 되었다. 이에 따라 설계 제작 및 성능시험기준을 확보하고, 기존 미수분무 소화장치용 고압펌프 진동 저감 및 내구성 향상으로 생산제품에 대한 신뢰성 향상을 이루었다.