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RISS 인기검색어
- 검색키워드
- 저자 : 고태혁(T . H . Koh) (검색결과 2 건)
- 무료
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고태혁(T . H . Koh),심금섭(K . S . Shim),변태호(T . H . Byun),이재근(J . K . Lee) 한국축산학회 1988 한국축산학회지 Vol.30 No.3
This experiment was carried out to investigate the effects of factors, such as incubation time, pH of medium and the sampling time from slaughter to incubation, on in vitro maturation of oocytes collected from ovarian follicles (3-5㎜ diameter) of the sows slaughtered at a processing plant. The results obtained were as follows : 1. Of 876 follicles, 434 oocytes could be harvested (49.5%). The oocytes were classified as $quot;Good$quot;, $quot;Fair$quot; and $quot;Poor$quot; depending morphological integrity and those were 17.7%, 65.2%o and 12.9% of the total oocytes harvested, respectively. Those classified as $quot;Good$quot; and $quot;Fair$quot; were utilized for incubation. 2. After 24 and 48 hours of incubation, the proportion of the oocytes matured to the second metaphase stage were 21% and 54.7%, respectively. 3. After 48 hours of incubation, the proportion of oocytes matured to the second metaphase stage in the medium which pH was adjusted to 6.70-6.99, 7.00-7.29 and 7.30-7.59 were 45.0%, 54.7%o and 55.0%, respectively. 4. The proportion of matured oocytes from follicles aspirated 1 hour and 2 hours after death of the donor were 54.7% and 42.1%, respectively.
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FeTaNC 초미세결정박막의 반응가스 분압에 따른 자기특성 변화
고태혁(T. H. Koh),신동훈(D. H. Shin),김형준(H. J. Kim),남승의(S. E. Nam),안동훈(D. H. Ahn) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.3
Magnetic properties and microstructures of FeTaNC thin films, which were deposited by magnetron reactive sputtering method, were investigated as a function of CH₄ and N₂ gas partial pressures. Magnetic properties of FeTaNC films depended on total reactive gas pressure as well as CH₄/N₂ pressure ratios. For reactive gas partial pressures of 5~10%, optimum magnetic properties were observed in the FeTaNC films with proper CH₄/N₂ ratio. On the other hand, at 15 % of gas partial pressure, FeTaN and FeTaC films showed superior properties to FeTaNC films. Above 15%, the magnetic properties of films rapidly degraded due to an excess incorporation of C and/or N atoms. Excellent soft magnetic properties of 17 kG of Bs, 0.3 Oe of Hc, and 4000 of μ′ (at 5 ㎒) were obtained in the FeTaNC films. High permeabilities of FeTaNC films could be explained by the Fe lattice distortion caused by N atoms, hence reduction of magnetic anisotopy. While precipitated TaN and TaC particles effectively supress the growth of α-Fe grains leading to a good soft magentic properties, FeN and FeC phases such as Fe₃N, Fe₄N, Fe_xC have detrimental effects.
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