• Title/Summary/Keyword: Se transfer

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An Expert System for Security Assessment in Distribution System (배전계토에서의 안전도 평가를 위한 전문가 시스)

  • Park, Byoung-youn;Kim, Se-Ho;Moon, Young-Hyun
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.43 no.2
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    • pp.179-188
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    • 1994

  • This paper deals with implementation of an expert system to obtain an optimal plan of load transfer for fault restoration with the capability of security monitoring and assessment in distribution systems. Based on the technique of load transfer tree analysis, the proposed expert system can afford to assist system operators in proposing an optimal plan of load transfer for fault restoration, In paticular, an application of the proposed ES to practical distribution systems yields an optimal load transfer plan which ensures system security by considering security assessment for contingency of feeders and main transformers in the knowledge based sense.

Highly Enantioselective Rh-catalyzed Transfer Hydrogenation of α-Functionalized Arylketones

  • Lee, Do-Min;Kwak, Se-Hun;Lee, Kee-In
    • Bulletin of the Korean Chemical Society
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    • v.30 no.6
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    • pp.1317-1324
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    • 2009

  • Asymmetric transfer hydrogenation of α-functionalized arylketones has been studied. The chiral Rh-catalyst effectively performed in transfer hydrogenation of $\alpha$-mesyloxyketones with an azeotropic mixture of formic acid/triethylamine to produce optically active 1-arylethandiols with excellent enantioselectivity.

  • https://doi.org/10.5012/bkcs.2009.30.6.1317 인용 PDF KSCI

Anti-Ionizing Radiation Effect of Selenium on Osteoporosis Model during Bone Repair Process (골다공증 모델의 뼈 재생기에 있어 셀레늄(Selenium)의 방사선 보호작용)

  • Kim, Hyun;Cho, Sang-Rae;Choe, Changyong;Seong, Hwan-Hoo
    • Journal of Embryo Transfer
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    • v.30 no.3
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    • pp.201-206
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    • 2015

  • Selenium (Se) is an essential trace element for humans and animals, and several findings suggest that dietary Se intake may be necessary for bone health. Accumulating evidence indicates that Se compounds possess anticancer properties. Se is specifically incorporated into proteins in the form of selenocysteine and non-specifically incorporated as selenomethionine in place of methionine. This study evaluated protection by Se in the bone repair process in ovariectomized rats after irradiation. For such purpose, 80 ovariectomized female Sprague-Dawley rats were randomly divided into 4 experimental groups: ovariectomized (Ov), Ov/Se, Ov/irradiated (Irr) and Ov/ Se/Irr. A bone defect was created on the tibia of all animals 40 days after ovariectomy. Two days after surgery, only the Ov/Se and Ov/Se/Irr rats received 0.8 mg Se/kg. Three days after surgery, only the Ov/Irr and Ov/Se/Irr rats received 10 Gy of X-rays on the lower limb region. The animals were euthanized at 7, 15, 22 and 29 days after surgery to assess the repair process, which was evaluated by analysis of trabecular bone number (Masson Trichrome) and birefringence analysis (Picrosirius). It was possible to observe a delay in the bone repair process in the ovariectomized/irradiated group and similarity between the ovariectomized, Ov/ Se and Ov/Se/Irr groups. Our findings suggest that sodium selenite may influence a radioprotective effect in the bone repair of tibia of ovariectomized rats without toxicity.

  • https://doi.org/10.12750/JET.2015.30.3.201 인용 PDF KSCI