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정자의 여러가지 형태학적 특징에 따른 정자 침투능의 평가
김진홍,정기욱,유영옥,권동진,임용택,김장흡,나덕진,이진우,Kim, J.H.,Jung, K.W.,Lew, Y.O.,Kwon, D.J.,Lim, Y.T.,Kim, J.H.,Nha, D.J.,Lee, J.W. 대한생식의학회 1994 Clinical and Experimental Reproductive Medicine Vol.21 No.1
Morphological estimation of human spermatozoa is complicated by the fact that there is great natural variation in shape. This natural variation in shapes makes it difficult to say which forms are associated with infertility and which are normal variations. Possibly post coital test or in vitro cervical mucus penetration tests will help to clarify this question by showing which sperm are capable of penetration. The purpose of this investigation was performed to assess distribution of various morphological abnormalities according to the ability of sperm to penetrate cervical mucus. The sperm-mucus penetration using hen's egg white as substituting mucus for human cervical mucus was done in 45 fertile men with normal semen analysis and 122 infertile men with abnormal seminal parameters more than one. The female partners of 122 infertile couples showed normal results in the female fundamental test for fertility. Conventional semen analysis was evaluated according to the WHO standard normal(l980). The detailed classification of the abnormal sperm was made according to David et al(l975). The vitality of the sperm samples determined by eosin yellow-nigrosin stainig according to the method of Eliasson(l977). Results were as follw; 1. The patients had significantly lower total sperm count, motility (%), normal morphology (%), viability and total functional sperm fractions(TFSF) than fertile donors. 2. The mean value of sperm penetration distance of the patients(28.69${\pm}$11.02mm) showed significantly lower than fertile donors(37.33${\pm}$5.49mm). And 43/45 fertile donors(95.5%) as well as 57/122 patients(46.7%) had over 30mm in sperm penetration distance respectively. While 2/45 fertile donors(4.5 %) and 65/122 patient(53.3%) had under 30mm in sperm penetration distance respectively. 3. The morphological abnormalities in fertile donors were significantly lower 23.04${\pm}$5.83% (head = 12.89${\pm}$4.98, neck=6.11${\pm}$3.83%, and tail=3.43${\pm}$2.65%), compared to 36.03${\pm}$14. 40% in patients(head = 15.98 8.60%, neck 11.20${\pm}$6.56% and tail=8.70${\pm}$6.55%). Also, 3 types of sperm abnormalities including head, neck and tail were significantly lower in patient than fertile donors, respectively. Both the patients and fertile donors showed higher distribution of sperm with abnormal head than abnormal neck and tail. 4. The mean morphological abnormalities(SP>30mm) of the patients(30.68 11.64%; head = 15.95${\pm}$9.35%, neck=8.14${\pm}$4.21 %, tail=6.56${\pm}$5.64%) were significantly lower compared to patients(40.72${\pm}$15.01 %; head=16.02${\pm}$7.69%, neck 13.89${\pm}$7.82%, tail=1O.58${\pm}$6.75%) under 30mm in sperm penetration distance. Also, both groups over 30mm and under 30mm in sperm penetration showed distance higher distribution of sperm with abnormal head than abnormal neck and tail. The morphological abnormalities of head did not show significant difference but abnormal neck and tail were significant difference between the over 30mm and under 30mm group in sperm penetration distance.
빙축 열시 스 템 PCM용 TMA- 포 접화 합물 의 과 냉도 개선 에 대 한 연구
김진홍(J. H. Kim),정낙규(N. K. Chung),김창오(C. O. Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
TMA clathrate that is used by PCM of ice storage system in this research creates hydrate<br/> crystallization at higher temperature than pure water, and application is expected as PCM because<br/> having comparative big dormant temperature without phase separation phenomenon. In case this research<br/> uses TMA clathrate by PCM, choose admixture by purpose to control or remove subcooling of TMA<br/> clathrate and evaluated experimentally . Subcooling is improved and can expect contraction of freezing<br/> machine running time and increase of coefficient of performance as that add admixture to TMA<br/> clathrate conclusively . Also, may supply thermal storage system that apply low temperature potential<br/> heat thermal storage material that subcooling is improved more extensively laying stress on medium<br/> size building and small size building, can expect allowance through localization of ice storage system.
FeCo / Pd 초격자 다층박막의 자기 및 자기광학적 특성
김진홍(J. -H. Kim),신성철(S. -C. Shin) 한국자기학회 1993 韓國磁氣學會誌 Vol.3 No.1
We have investigated the dependence of the magnetization, anisotropy, coercivity, and Kerr rotation on the Fe concentration in FeCo /Pd multilayer thin films, where the Fe concentration in the FeCo sublayer varied between 0 and 100% with maintaining the same sublayer thickness of 2.5Å FeCo and 10.5Å Pd. The maximum saturation magnetization was observed at the Fe concentration of about 48at.% in the FeCo sublayer. Perpendicular magnetic anisotropy and coercivity of the FeCo /Pd multilayer thin film decreased monotonically with increasing the Fe concentration. The Kerr rotation angle also decreased with increasing the Fe concentration and the amount of variation was remarkably changed with decreasing the light wavelength.