• Journal of the Korean Geotechnical Society
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• v.34 no.6
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• pp.17-24
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• 2018

In this study, static load test and dynamic load test were performed to evaluate pile-filling material (ZA-Soil) of soil-cement injected precast pile method which was developed by using the ash of circulating fluidized boiler as a stimulant for alkali activation reaction of blast furnace slag. As a result of the static load test, the allowable bearing capacity of pile was 1,350 kN, which was the same as the result of using ordinary portland cement. And total settlement was 6.97 mm, and net settlement was 1.48 mm. These are similar to the total settlement, 7.825 mm, and net settlement, 2.005 mm of ordinary portland cement. As a result of the dynamic load test and CAPWAP analysis, the skin friction was 375.0 kN, the end bearing capacity was 3,045.9 kN, and the allowable bearing capacity was 1,368.36 kN. These results are similar to the results of using ordinary portland cement as pile-filling material.

• Korean Journal of Agricultural Science
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• v.28 no.2
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• pp.85-91
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• 2001

This study was carried out to investigate the effects of liquid boar semen on reproductive performance in swine artificial insemination. Many factors, which were breeds, time of insemination, breeding season, sperm per dose etc, have been tried to improve reproductive efficiency. Boars were raised at Swine Artificial Insemination Center in National Livestock Research Institute, Sunghwan, Chungnam, Korea. This experiment was carried out from 1995 to 2000. There were no differences in the fertility results compared with 3 breeds (Landrace, Yorkshire and Duroc), frequencies of artificial insemination (double and triple) per estrus cycle and different seasons by using liquid boar semen. There were no significant differences in conception rate, farrowing rate and litter size using 4 trials of 3.0, 2.5, 2.0 and $1.5{\times}10^9/80ml$ in liquid boar semen with 70% of motile sperm cells. We confirmed that the sperm number per dose of $1.5{\times}10^9/80ml$ could be used for commercial artificial insemination.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.10
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• pp.446-451
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• 2019

This study investigated the application of artificial insemination and pregnancy diagnosis kit for Korean native black goats. Semen was collected by electrical ejaculation, followed by semen analysis and artificial insemination in three goat strains (Dangjin, Jangsu and Tongyoung). Pregnancy was confirmed using a cow pregnancy test kit (IDEXX Rapid Visual Pregnancy Test kit) and ultrasound diagnosis. Analysis revealed that semen collected from male Korean native black goats by electrical ejaculation was about 1~1.5 ml in volume, $18{\sim}25{\times}10^8/ml$ concentration, and having > 97% motility. Furthermore, confirmation of pregnancy by pregnancy test kit and ultrasound diagnosis after artificial insemination were similar. In addition, the efficiency of pregnancy was 20~40% for all three strains: Tongyoung was the highest with 44%, followed by Dangjin (%), and Jangsu (20%). This study determines the artificial fertilization efficiency and the feasibility of using a cow pregnancy test kit for early pregnancy diagnosis in Korean native black goats. Although further research is required for validation, the results of the current study contribute to the breeding and improvement of Korean native black goat in research institutions as well as in general farms.

• Proceedings of the Korean Society of Developmental Biology Conference
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• 2005.10a
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• pp.104-104
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• 2005

• Proceedings of the Korean Society of Developmental Biology Conference
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• 2005.10a
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• pp.103-103
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• 2005

• Proceedings of the Korean Society of Embryo Transfer Conference
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• 2005.10a
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• pp.104-104
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• 2005

• Proceedings of the Korean Society of Embryo Transfer Conference
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• 2005.10a
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• pp.103-103
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• 2005

• Proceedings of the Korean Society of Embryo Transfer Conference
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• 2003.10a
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• pp.79-79
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• 2003

• Proceedings of the Korean Society of Developmental Biology Conference
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• 1998.07a
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• pp.68-69
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• 1998

정액의 ml당 정자수는 $1.13 \pm 0.34 \times 10^{10}$이었고 spermatocrit는 $64.8 \pm 1.4$였으며, 정장의 삼투질농도는 $266 \pm 2$ mOsm/kg이었다. 총 단백질 함량과 총 지질 함량은 정장에 비해 정자에서 높은 값을 보였고, glucose는 검출되지 않았다. 황복 정자를 16일간 $0 \pm 0.5 \circ C$에서 냉장보존 하였을 때, 수정률은 0-0.7%로 보존효과가 저조한 것으로 나타났다. 황복 정자의 냉동보존을 위한 희석액으로는 marine fish Ringer's solution, 동해방지제로는 5% DMSO가 적합하였으며, 이때의 수정률은 $79.3 \pm 7.5$%였다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2019.07a
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• pp.61-62
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• 2019

RPG장르를 기준으로 게임이용등급별 게임들의 평균 이벤트 기간의 차이를 조사, 분석한 결과, 게임이용 등급별 게임들의 이벤트 실시 기간의 평균의 차이를 보이지 않고 있음을 알 수 있다. 이에 본 연구에서는 정액제와 부분유료화 등 요금정책을 기반으로 정액제를 실시하고 있는 게임과 부분유료화를 실시하고 있는 게임간의 이벤트 실시 기간의 평균의 차이를 연구하였다.