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Dynamics of Disconnected Risers under Rigid and Compliant Hang-off
D. Y. Yoon(윤덕영),N. M. Patrikalakis(엔. 엠. 페트리카라키스) 한국해양공학회 1987 韓國海洋工學會誌 Vol.1 No.2
석유시추 보호관의 비선형 운동을 시뮬레이트하는 유효한 해법이 non-uniform grid 유한차분법과 implicit time 적분법에 근거하여 제시되었다. 극한 상태에 있는 지지 플랫폼의 상승 가속도에 의해 생기는 보호관의 동적 좌굴형 반응에 관하여 상세히 연구되었고, 이 반응에 미치는 중요 변수가 규명되었다. 운동의 현저한 감소와 이에 따른 응력들이 컴플라이언트 행오프(hang-off)를 적용시킴으로써 얻어졌다.
종돈의 능력검정에 관한 연구 1 . 비육돈의 비육종료시 체중에 따른 산육능력의 비교
홍기창(K . C . Hong),윤덕영(D . Y . Yoon),박홍양(H . Y . Park) 한국축산학회 1989 한국축산학회지 Vol.31 No.6
This study was carried out in order to test the fattening performance and the change of body composition of pigs by slaughter weights. Sixty heads of three-way crossbred pigs were used for this purpose. Those pigs were slaughtered at live weight of 90, 100 and 110㎏, respectively. The results were summarized as follows: 1. In order to improve the feed requirement and backfat thickness in fattening pigs reared to 110㎏, the fattening performance of breeding pigs must be more improved. 2. As the slaughter weight increased, the carcass lengths were increased in both sexes. In the viewpoint of anatomy this shows the possibility of more attachment of muscles. 3. The percentages of dressing and lean cut were increased at 110㎏ slaughter weight and the proportion of ham was significantly increased than any other valuable parts. 4. But the quality of carcass was relatively lower than that of the developed countries. Therefore, it is desirable to select breeding pigs more intensively based on carcass quality. 5. Gross income per head was the highest at 110㎏ slaughter weight. But considering the turnover rate 90㎏ slaughter weight is acceptable under the present pork pricing system. 6. In order to increase pork export, the present system of grading and pricing should be reorganized. 7. Considering above-mentioned findings the present performance test of breeding pigs at 90㎏ should be changed to 110㎏ as soon as possible.
모돈의 생산성 향상에 관한 연구 2 . 자돈의 성장형질에 대한 포유자돈 합방의 효과
홍기창(K . C . Hong),전진태(J . T . Jeon),윤덕영(D . Y . Yoon),박홍양(H . Y . Park) 한국축산학회 1991 한국축산학회지 Vol.33 No.8
We examined the effects of litters mixing during pre-weaning period on the growth trait of piglets, and the possible way of selection for the mothering ability of sow on the behavioral basis of piglet using 6 sews and their 53 piglets. A significant difference(p$lt;0.01) was found in the weight at 8-week of age, being 21.95 ㎏ in experimental vs 19.53 ㎏ in control group. This tendency continued until the time of marketing, gaining an additional 3 kg per piglet. The body weight gain of piglet during 4 weeks(from 4 to 8 weeks age) was also significantly higher(p$lt;0.01), being 14.13 ㎏ in experimental us 11.99 ㎏ in control group. Futhermore. it was found that the behavior of piglets toward the better ow could be used as an indication for the better mothering ability of sow, The results suggest that mixing the litter: during pre-weaning period would give beneficial effects on the growth, and provide an alternative way of selection for the sow with better mothering ability.