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우레탄 수지 첨가에 의한 다이니마/비닐에스터 복합재료의 방탄효과 향상 연구
윤태호 ( T. H. Yoon ),차영미 ( Y. M. Cha ),육종일 ( J. I. Yuck ),백종규 ( J. G. Paik ),오영준 ( Y. J. Oh ),김희재 ( H. J. Kim ) 한국복합재료학회 2011 Composites research Vol.24 No.6
우레탄 수지 첨가에 의한 다이니마/비닐에스터 복합재료의 방탄효과 향상을 고찰하였다. 첫째로 우레탄 수지와 비닐에스터 수지를 스프레이 코팅하여 프리프레그를 제조하였으며, 수지함량을 21%로 조절하였다. 또한 혼합수지를 스프레이 코팅과 필름코팅으로 비교를 위한 프리프레그를 제조하였다. 그 다음 이들을 상온에서 1-2시간, 그리고 필요 시 100℃ 에서 30분 정도 건조시켰다. 이들 프리프레그를 24층 적층한 다음 120℃에서 5분 동안 정치 시킨 후 25분 동안 150 kg/㎠ 압력하에서 경화 시켰다. 모의 파편탄(17 gr)을 이용하여 이들 복합재료의 방탄성능(V50)를 측정하였으며, UP127 및 EB8200으로 제조된 시편은 XSR10으로 제조된 시편에 비하여 각각 6.5 및 9.0 % 향상된 값을 보였다 Polyurethane oligomers (PUOs) such as UA8297, UP127 and EB8200 were utilized to enhance the anti-bullet property of Dyneema(R)/vinylester composites. First, prepregs of PUO and vinylester (XSR10) were prepared via spray coating on Dyneema(R) fabric at 21% resin content (by volume). In addition, spray coating and film lamination were also carried out with a mixture of XSR10/PUO for selected PUOs. Next, the prepregs were dried at RT for 1-2 h and then at 100℃ for 30 min to remove the solvent and to provide partial cure when necessary. The prepregs were stacked in 24 Layers and cured at 120℃ for 5 min under the contact pressure and for additional 25 min at 150 kg/㎠. Finally, the anti-bullet properties of composite samples were evaluated by measuring V50 with simulated fragment projectile (SFP, 17 gr). The results showed a 6.5 and 9.0 % increase of V50 with UP127 and EB8200, respectively.
이수원,김희재 성균관대학교 생명과학자원연구소 1997 生命資源科學硏究 Vol.4 No.2
Human milk samples taken from 78 healthy lactating women in Suweon area were analyzed to find out the changes of the general and vitamin contents during 5 different lactation period. The results were as follows; 1. The average contents of protein, fat, lactose, ash, and moisture in human milk were 1.25±0.05, 3.56±0.45, 6.82±0.58, 0.21±0.08, and 87.88±0.98%, respectively. 2. The protein and ash were significantly decreased from 1.86 and 0.26% to 1.18 and 0.18%, but the contents of fat, lactose, and total solid were gradually increased from 2.95, 6.18, and 11.87% to 3.72, 7.02, and 12.25% during lactation period, respectively. 3. Protein, fat, and lactose showed positive correlation with total solid. Ash showed positive correlation with protein but it showed negative correlation with other constituents. 4. Vitamin contents of colostrum were 270 IU/100g of vit. A, trace of vit. B_1, 0.03mg/l00g of vit. B_2, 8.5㎍/l00g of vit. B_6, 0.06㎍/100g of vit. B_12, 3.4mg/100g of vit. C, 0.7mg/l00g of vit. E, and 0.2㎍/100g of vit. K_1. vit. A, β-carotene. vit. E decreased, but vit. C and B groups increased during lactation period.