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RISS 인기검색어
- 검색키워드
- 저자 : 강병규(Byoung Kyu Kang) (검색결과 3 건)
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최인혁,최연규,이동일,이원교,강병규,박준호,Choi, In-Hyuk,Choi, Yon-Gyu,Lee, Dong-Il,Lee, Won-Kyo,Kang, Byoung-Kyu,Park, Jun-Ho 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.7
36,000lbs porcelain insulators of D-1995, D-1997 and D-2002 investigated mechanical and electrical qualities, where is process of using in the Korea 154 kV transmission lines. It analyzes the cause of the elapse of a year aging of the transmission insulators. Weibull distribution function, product quality and uniform quality, etc. investigated for prediction to extant life of insulator. It calculate change as statistical elapse of a year through product qualities of used insulator and new insulator, uniform equality and uniformity of insulator. In case of D-1995 year used insulator, it decided to badness decline index k by 0.0237, badness quality index by 1.0 and 3.0. Result of extant confidence life Ym was calculated that remain each 4 yens and 0.7 yens that uniformity index is considered. Extant life of D-1997 and D-2002 insulators Predicted by about 40 years.
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최인혁,이동일,이철호,강병규,이원교,박준호,Choi, In-Hyuk,Lee, Dong-Il,Lee, Chul-Ho,Kang, Byoung-Kyu,Lee, Won-Kyo,Park, Jun-Ho 한국전기전자재료학회 2007 전기전자재료학회논문지 Vol.20 No.9
To understand the effects of forest fires on polymer insulators for transmission lines, the forest fire simulation tests were performed with polymer and porcelain insulators at Gochang testing center. These tests consisted of energizing 90 kV at line-to-ground voltage of 154 kV lines and open flame rising up to $600-630^{\circ}C$ as being measured at insulator surface. Mechanical and electrical characteristics such as specific mechanical load, leakage current, low frequency dry flashover voltage and impulse flashover voltage were analyzed for the polymer insulators before, during and after simulation tests compared with porcelain insulators. At the end of fire simulation tests, there was no detrimental deterioration of any insulators. All insulators passed the criteria of KEPCO specification. This study showed that forest fire simulation had no impact on polymer insulators.
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나진수(Jin Soo Na),김용식(Yong Sik Kim),강병규(Byoung Kyu Kang) 한국축산학회 1987 한국축산학회지 Vol.29 No.7
The experiments of estrus synchronization, superovulation, embryo recovery and transfer were carried out to obtain basic informations and to develope basic technics necessary for the controlled breeding programmes in Korean native goats from January to September, 1986. Fifty female Koiean native goats weighing about 20㎏ were used. The goats were housed in sheltered out-door barn and fed in group under field conditions. For estrus control, a total of 59 does was treated with a single i.m. injection of 1 to 5 ㎎ PGF₂α (Lutalyse; Upjohn, U.S.A). Forty-five (75.3%) of 59 does showed estrus after treatment, and the mean (±S.E) hours from injection to estrus was 53.00±1.52. Estrus was induced in 15 (78.9%) of 19 does injected with 1㎎ of PGF₂α. Thirty-two does were treated to induce superovulation with a single i.m. injection of 100 to 1,000 IU PMSG (Peamex; Sankyo, Japan) after estrus cycle control by PGF₂α. Twenty-nine (90.6%) of 32 does exhibited estrus after treatment and 20 of 29 does were hand-mated. Laparotomies showed that 16 of 20 does mated had ovulated and the mean (±S.E.) number of ovulations was 3.22±1.47 in 1,000 IU treated group. The oviducts of donor does were flushed with modified Dulbecco`s phospate-buffered saline between 24 and 79 hours after mating. Twenty-three ova (76.7%) of 30 ovulations were recovered by oviduct flushings and 22 of them were fertilized. Development stage of ova ranged from 1-cell to 8-cell stage. A total of 22 fertilized ova was transferred at rates of one to three per animal into the oviducts of 10 recipient does which were synchronized within ± 1 day of estrus with donor. Three of the recipients were pregnant and delivered 6 kids (2 kids per doe).
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