• Korean Journal of Animal Reproduction
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• v.11 no.1
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• pp.22-25
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• 1987

This study was carried out to investigate the effects of imported pellet frozen semen on sperm motility and NAR acrosomes after thawing, and the farrowing rates, litter sizes and preweaning body weights after artificial insemination. A total of 28 sows of Landrace, Large White and Duroc were inseminated at the Chungnam Provincial Animal Breeding Station. The results obtained are summarized as follows: 1. Landrace andLarge White had higher sperm motility than Duroc by about 20% and had higher NAR acrosomes by about 10%. 2. The farrowing rates of Landrace, Large White and Duroc were 63.6, 55.6 adn 50.0%, respectively. The number of pigs born alive per litter were larger in Landrace and Large White as compared with Duroc (p<.01). 3. Duroc had the highest mean pig weight at birth, followed by Landrace and Large White (p<.01). The mean pig weights at 21 days and 56 days had no significant differences between the breeds.

• Korean Journal of Animal Reproduction
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• v.19 no.3
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• pp.197-203
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• 1995

Serum progesterone concentrations of pregnant and non-pregnant Hanwoo were compared to evaluate the possibility of early pregnancy prediction. Twenty five female Hanwoo were devided into two groups. Eighteen heads were injected with 980$\mu\textrm{g}$ tiaprost trometamol salt(Iliren:PGF2$\alpha$ analogue) for estrous synchronization and fifteen heads of them were inseminated artifically and seven heads were non-treated. Blood samples were collected from the jugular vein before PGF2$\alpha$ injection and on day 0, 18, 21 after estrous induction. Pregnancy of cattle was confirmed by rectal palpaton after 60 days of artificial insemination. The serum progesterone concentrations at heat showed no significant differences between pregnant and non-pregnant while on day 18 and 21 after estrous induction showed significant differences(p<0.05). The accuracy of pregnancy diagnosis on day 18 and 21 after estrous induction was 85.7 and 71.4% respectively while that of non-pregnancy were 71.4 and 100.0% respectively.

• Proceedings of the KIEE Conference
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• 1995.07b
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• pp.1006-1010
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• 1995

This paper describes Sexual Reproduction Genetic Algorithm(SRGA) for function optimization. In SRGA, each individual utilize a diploid chromosome structure. Sex cells(gametes) are produced through artificial meiosis in which crossover and mutation occur. The proposed method has two selection operators, one, individual selection which selects the individual to fertilize, and the other, gamete selection which makes zygote for offspring production. We consider the effects of multi-selection and diploidy on search performance. SRGA improves local and global search(exploitation and exploration) and show optimum tracking performance in nonstationary environments. Gray coding is incorporated to transforming the search space and Genic uniform distribution method is proposed to alleviate the problem of premature convergence.

• Asian-Australasian Journal of Animal Sciences
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• v.24 no.9
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• pp.1192-1198
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• 2011

Peri-partum metabolic profile was evaluated in winter and summer calving, with 15 Murrah buffaloes in each seasonal group. In summer calvers, significantly lower values were observed for blood plasma urea nitrogen (BUN) at day 30 pre-partum (p<0.05), on calving day (p<0.05) and at all other stages (p<0.01); plasma non-esterified fatty acids (NEFA) values were significantly lower on day 30 pre-partum (p<0.01) and on day 60 post-partum (p<0.05). This was associated with significant reduction in days to first service (DFS) and service per conception (SPC) and an overall better reproductive performance in terms of service period, risk to first service on days 60, 90 and >90, and pregnancy risk to first service up to days 60 and 90. This may be attributed to better pre-partum nutritional status. Cervical and uterine involution were completed in fewer days, involutional changes took place at a faster pace and there were a lower number of abnormal involutional changes in winter compared to summer season. This may be attributed to better post-partum nutrition and less environmental stress. However, validation requires further targeted cohort investigation with a large sample size.

• The Journal of Korea Robotics Society
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• v.19 no.2
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• pp.221-228
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• 2024

As the importance of cardiovascular health is highlighted, research on its correlation with blood pressure, the most important indicator, is being actively conducted. Therefore, extensive clinical data is essential, but the measurement of the central arterial blood pressure waveform must be performed invasively within the artery, so the quantity and quality are limited. This study suggested a mock circulatory robot and artificial aorta to reproduce the blood pressure waveform generated by the overlap of forward and reflected waves. The artificial aorta was fabricated with biomimetic silicone to mimic the physiological structure and vascular stiffness of the human. A pressurizing chamber was implemented to prevent distortion of the blood pressure waveform due to the strain-softening of biomimetic silicone. The reproduced central arterial blood pressure waveforms have similar magnitude, shape, and propagation characteristics to humans. In addition, changes in blood pressure waveform due to aging were also reproduced by replacing an artificial aorta with various stiffness. It can be expanded to construct a biosignal database and health sensor testing platform, a core technology for cardiovascular health-related research.

• Asian-Australasian Journal of Animal Sciences
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• v.33 no.12
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• pp.1922-1929
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• 2020

Objective: The present study aimed to survey seasonal changes in reproductive performance of local cows receiving artificial insemination (AI) in the Pursat province of Cambodia, a tropical country, to investigate if ambient conditions affect the reproductive performance of cows as to better understand the major problems regarding cattle production. Methods: The number of cows receiving AI, resultant number of calving, and calving rate were analyzed for those receiving the first AI from 2016 to 2017. The year was divided into three seasons: cool/dry (from November to February), hot/dry (from March to June), and wet (from July to October), based on the maximal temperature and rainfall in Pursat, to analyze the relationship between ambient conditions and the reproductive performance of cows. Body condition scores (BCS) and feeding schemes were also analyzed in these seasons. Results: The number of cows receiving AI was significantly higher in the cool/dry season than the wet season. The number of calving and calving rate were significantly higher in cows receiving AI in the cool/dry season compared with the hot/dry and wet seasons. The cows showed higher BCSs in the cool/dry season compared to the hot/dry and wet seasons probably due to the seasonal changes in the feeding schemes: these cows grazed on wild grasses in the cool/dry season but fed with a limited amount of grasses and straw in the hot/dry and wet seasons. Conclusion: The present study suggests that the low number of cows receiving AI, low number of calving, and low calving rate could be mainly due to poor body condition as a result of the poor feeding schemes during the hot/dry and wet seasons. The improvement of body condition by the refinement of feeding schemes may contribute to an increase in the reproductive performance in cows during the hot/dry and wet seasons in Cambodia.

• Korean Journal of Agricultural Science
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• v.34 no.1
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• pp.37-46
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• 2007

This study was conducted to investigate the antler induction rate and production by artificial induction of antlerogenesis using $CaCl_2$ injection on both periosteum around area of horn development for the frontal bone of a female elk deer which do not have an antler. The results obtained from eleven deers for verifying effect of the female's antler induction on reproduction are as follows: The antler development induction by $CaCl_2$injection is higher on the treatments of 30 and 50% of $CaCl_2$ injection than those on the treatments of 15 %. The antler production is higher on the 30 % $CaCl_2$ injection than those of 15 and 50 % $CaCl_2$ injection. For 30 % $CaCl_2$ injection, the antler production is higher in 1.5 and 2.0 ml of % $CaCl_2$ injection than the other injection level. After the induction of antler development, the birth rate is not changed as of 75~100 %, while the regeneration rate of the antler which was not constant in approximately 45 % for five among eleven female deer. With these results, we assume that the injection concentration and amount of $CaCl_2$ injection are around 30 % and 1.5 and 2.0 ml level which can be not only most effective conditions for the antler induction rate and production, but also these conditions do not influence the reproduction during the period of the female elk's antler development induction.

• Journal of the Korea Computer Graphics Society
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• v.28 no.3
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• pp.67-77
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• 2022

The sense of touch by natural wind is one of the most common feels that every person experiences in daily life. However, it has been rarely studied how natural wind can be reproduced in a VR environment and whether the multisensory contents equipped with artificial winds do improve human emotion or not. To address these issues, we first propose a wind reproduction VR system guided by video and wind capture data and also study the effect of the system on positive affect. We collected wind direction and speed data together with a 360-degree video on a yacht. These pieces of data were used to produce a multisensory VR environment by our wind reproduction VR system. 19 college students participated in the experiments, where the Korean version of Positive and Negative Affect Schedule (K-PANAS) was introduced to measure their emotions. Through the K-PANAS, we found that 'inspired' and 'active' emotions increase significantly after experiencing the yacht VR contents with artificial wind. Our experimental results also show that another emotion, 'interested', is most notably affected depending on the presence of the wind. The presented system can be effectively used in various VR applications such as interactive media and experiential contents.

• Journal of Animal Reproduction and Biotechnology
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• v.35 no.1
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• pp.50-57
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• 2020

The objective of this research work was to know ovarian dynamics and pregnancy rate of cyclic Murrah buffalo cows with induced estrus by administration of prostaglandin F2α (PGF2α) and timed artificial insemination (TAI) with frozen thawed semen. A total of 31 female buffaloes were selected for the study. The buffalos having matured CL observed by ultrasonography were given one intra muscular injection of cloprostenol 500 ㎍ and TAI was performed using frozen thawed semen of Indian Murrah buffalo bull. Results showed that 90.32% (significantly, at p < 0.05) cows explore the sign of heat after injection of PG and 67.85% (significantly, at p < 0.05) cows were become pregnant out of 28 inseminated (TAI) cows. In the 28 inseminated (TAI) cows, average number of smaller and larger size of follicles were non-significantly (p > 0.05) higher at day 3 post PG injection, but the medium size of follicles was nonsignificantly (p > 0.05) higher at PG injection. At day 3 post PG injection the diameter of follicles was significantly (p < 0.05) higher, but the diameter of CL was significantly (p < 0.01) lower compared at PG injection. At PG injection the diameter of largest follicle was non-significantly differences (p > 0.05) in between pregnant and non-pregnant cows. But at day 3 post PG injection it was significantly (p < 0.01) higher in pregnant cows compared to non-pregnant cows. The number of small, medium, and large follicles at PG injection and at day 3 post PG injection were non-significantly (p > 0.05) difference in between pregnant and non-pregnant buffalo cows. Finally, it is concluded that the CL was effectively regresses and induced the sign of heat in buffalo cows and after AI the cows were become pregnant with significant rate. The study will help to the veterinarian and researcher to know the efficacy of PG injection and AI for reproductive efficiency in buffalo cows.

• Journal of the korean veterinary medical association
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• v.35 no.2
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• pp.108-109
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• 1999

오늘날 `인공수정`하면 소,돼지는 일반화된 방법이 된 지 오래다. 그런데 `개의 인공수정`하면 아직도 많은 수의사나 번식가들이 회의를 가지고 있다. 필자 역시 KCRC 울산 지회로 가입하기 전까지는 그런 부류에 속했다. 그러나 KCRC의 수차례의 Canine Reproduction(AL)에 대한 세미나와 실습을 통하여 냉동 정액을 이용하여 인공수정을 할 수 있구나 하는 생각을 가지게 되었고 필자가 인공수정의 전 과정을 스르로 해 본 결과 나름대로 확신을 가질 수 있게 되었다. 물론 다음의 한 예가 인공수정에 대한 의문을 모두 제거하리라는 기대는 무리가 있겠지만 최소한 개의 인공 수정에 대한 이해의 폭은 넓히리라 확신한다.