• Journal of the Korean Geophysical Society
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• v.3 no.1
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• pp.25-36
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• 2000

3-D Spectrograms for 22 events are drawn to discern about whether those are earthquakes or explosions. Generally, in case of explosions relative to the case of earthquakes, amplitude of P phase is more dominantly shown. According to the results on logarithm of spectral ratio of P (Pn, Pg)/Lg after removing free-surface effects from 3-D (U-D, N-S, E-W) seismogram, $-1.2{\sim}-0.9$ is shown for earthquakes and $-0.7{\sim}-0.1$ if shown for explosions. This result is consistent with previous researches (Kim Park, 1997) that -0.6 of spectral ratio between P and Lg after taking logarithm may be the criterion for the discrimination between earthquakes and explosions in Korea. In addition, Complexity is applied to two events as another discrimination method. The value of Complexity of explosion is much smaller than that of earthquake. This may be due to well-developed P-wave in explosion compared to that in earthquake. This result is in accordance with that of 3-D Spectrogram.

• Journal of Animal Science and Technology
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• v.49 no.4
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• pp.451-458
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• 2007

This study was to investigate the effectiveness of pre-weaning injection of gonadotropin and scheduled fixed-time insemination on sow fertility. Sows were randomly assigned to receive gonadotropin 2 days before weaning, 1 day after weaning or none as control. In gonadotropin treated groups, half of sows were inseminated twice at 24 and 36 hours after onset estrus and half of sows were inseminated twice at scheduled fixed-time. Weaning to onset of estrus was the shortest in lactating sows injected with gonadotropin prior to weaning. Liter size was significantly higher in AI groups after detection of estrus, compared to fixed-time AI group. Results of these experiments indicated that injection of gonadotropin in lactating sows could initiate the final follicular development, and has potential to enhance the reintegration of estrus. Further researches are needed to define the relationship between reduced interval of wean to onset estrus and enhanced fertility in lactating sows.

• 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.

• Journal of Environmental Impact Assessment
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• v.27 no.6
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• pp.582-594
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• 2018

In this study, the vertical and horizontal flow wetlands were combined in series to create conditions for flow in the exhalation and anaerobic state with the aim of monitoring the variability and reduction of dissolved organic matterin the bio-reactive artificial wetlands, and the performance assessment was conducted as acrylic reaction groups by designing artificial wetlands that filled the functionalresiduals. In case of artificial wetlands in vertical and horizontal planes, the concentration of dissolved oxygen (DO) in the reaction tank was measured as 2.7 mg/L in the vertical flow wetlands under exhalation, and N.D. in the horizontal flow artificial wetlands under anaerobic conditions. The test was carried out by changing the operation time to 140 min, 80 min, and 60 min. The test was conducted with the same natural operation time of 20 min depending on the operation time. All hours of operation were shown to be due to microbial activity. In 3D-EEM, it was found that the longer the driving time was taken, the more reduction the organic compounds in the areas of insoluble human resources, III and V. Further research on the mechanism analysis of future reduction effects is expected to be carried out, but the findings are expected to contribute to the development of technologies for reducing obfuscated substances using artificial wetlands in the future.

• Korean Journal of Poultry Science
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• v.34 no.1
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• pp.53-56
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• 2007

An experiment was conducted to investigate the effect of ME and crude protein (CP) content of diet on the performance and production cost of white semibroiler chickens. Three hundred sixty hatched white semibroiler chickens (Hy-Line $female\;{\times}\;Ross^{(R)}$ male) were assigned to low dietary treatments of different metabolizable energy (ME) value and crude protein (CP) content: T1; ME 3,040 and 3,070 kcal/kg, CP 21.40 and 20.86%, T2; ME 2,950 and 3,000 kcal/kg, CP 20.62 and 19.70%, T3; ME 2,950 and 3,000 kcal/kg, CP 19.90 and 18.70% and T4; ME 2,900 and 2,920 kcal/kg, CP 18.50 and 18.00% for starter diet ($0{\sim}1st$ wk) and power diet ($2{\sim}5th$ wk), respectively There were significant (P<0.01) differences among treatments in weight gain, feed intake and feed conversion ratio. T1 was significantly higher in weight gain and feed intake and love. in feed conversion ratio than other treatments. Production index of T1 (153.42) was far greater than T2 (112.13), T3 (108.40) and T4 (100.95). It was concluded that semibroilers required similar ME and CP to those of regular commercial broilers (highbro).

• Applied Biological Chemistry
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• v.1
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• pp.34-36
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• 1960

Riboflavin and protein fortified, fermented feed were prepared by cultivating koji mold of riboflavin producibility on sweet potato starch waste with addition of ammonium sulfate. Progressive riboflavin and protein yield were obtained in the feed with additive amount of ammonium sulfate up to 4%. The effect was further enchanced by mixing 1/4 amount of wheat bran and $2{\sim}3%$ calcium superphosphate with starch waste. The best fermented feed were fortified with 15% protein and 2.2 mg % of riboflavin while the starch content was decreased to 13%. The amino acid composition of mold body was studied.

• Proceedings of the Korean Aquaculture Society Conference
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• 2003.10a
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• pp.51-51
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• 2003

대농갱이는 체형이 동자개와 비슷하나 지금까지 인공부화는 물론 산란습성에 관해서도 잘 알려져 있지 않은 미개발 어종으로 양식품종의 다양화 및 경쟁력 있는 새로운 품종 개발을 위하여 인공종묘생산 시험을 시도하였다. 본 연구에 사용한 대농갱이 친어는 금강 중류역에서 서식하고 있는 자연산 친어로 암컷 210마리, 수컷 148마리를 사용하였다. 호르몬주사에 의한 인공 배란효과 조사를 위해 암컷 한 마리당 HCG 1,000 IU 주사군(75마리)과 2,000 IU 주사군(135마리)으로 나누어 배란율을 조사하였으며, 수컷은 주사하지 않고 정소를 적출하여 막자사발에 갈아서 등조액과 혼합하여 사용했다. 수정 방법은 난을 착출하면서 정자 등조액을 동시에 흘리는 방법, 난을 그릇에 받은 후 정자 등조액을 혼합 수정하는 방법, 채란용기에 정자 등조액을 미리 넣고 암컷의 난을 짜 넣어 수정시키는 방법 등 3가지 방법을 사용하였다. 부화된 자어는 초기먹이로 알테미아(3일 급이), 실지렁이(6일 급이), 배합사료 순으로 급이하였으며 수온 25~28$^{\circ}C$에 유지관리하면서 성장도 시험을 실시하였다. 호르몬 주사에 의한 배란효과는 HCG 2,000 IU 주사군(채란율 88.9%)이 1,000 IU 주사군(37.3%)에 비해 월등히 높았으며 난의 성숙상태도 좋았다. 수정방법에 있어서는 채란과 동시에 정자 등조액을 흘려 수정시키는 방법과 채란용기에 미리 정자 등조액을 넣고 암컷의 난을 한 마리씩 짜서 수정한 후 바로 부화지로 이동하여 고르게 뿌려 준 경우가 수정율 및 부화율이 좋았다. 부화수온은 23$\pm$1$^{\circ}C$에서 96시간, 26$\pm$1$^{\circ}C$에서는 72시간만에 부화되었으며 부화여건이 좋으면 단시간에 부화할 수 있도록 하는 것이 수생균 발생을 억제할 수 있어서 효과적이었다. 자치어의 성장도 실험에서는 사육수온 25~28$^{\circ}C$에서 직선식으로 나타낼 수 있어서 평균체장은 Y=0.9943X+0.7867, 평균체중은 Y=0.8800-0.6800로 각각 표시되었다.

• Proceedings of the Korean Aquaculture Society Conference
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• 2003.10a
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• pp.61-61
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• 2003

자바리, Epinephelus bruneus는 제주에서 다금바리로 불리우고, 제주도 남부 연안에서 주로 어획되며, 식용어로서 기호도가 높은 어종이다. 자바리의 자원량 격감과 가격상승으로 양식 산업화를 위한 종묘생산에 기술개발이 요구되는 실정이다. 이 실험에 이용된 자바리 어미는 전장 81.5$\pm$3.5 cm, 체중 7,38$\pm$1.06 kg에서 인공 채란된 난과 정자를 인공 수정방법을 이용하여 얻었다. 알의 직경은 900.11$\pm$2.52 $\mu$m이었고, 유구경은 233.98$\pm$2.48 $\mu$m이었다. 수정란은 수온 $25^{\circ}C$에서 32시간 30분에 부화(50%)되었고, 부화율을 96.76$\pm$0,49%였다. 부화자어는 90일 동안 로티퍼, Artemia nauplii, 인공사료를 공급하였다. 부화 직후의 자어는 전장이 2.02$\pm$0.02 mm이였다. 부화 후 3일째(2,76$\pm$0.08 mm) 난황이 대부분 흡수되고, 입이 열렸다. 개구시 입의 크기는 219$\pm$10 $\mu$m 이었다. 부화 후 3일째 막지느러미 후부에 색소포 침적이 일어났다. 부화 후 11일째(4.12$\pm$0.09 mm) 등지느러미 제2극조와 배지느러미 극이 돌출하였다. 부화 후 17일째(6.10$\pm$0.14 mm) 자어에 있어서 꼬리지느러미, 등지느러미의 기조 부위가 발생하기 시작하였다. 부화 후 54일째(41.12$\pm$l.20 mm) 모든 지느러미의 기조는 대부분 분화되어 성어와 비슷한 체색과 체형을 갖는 치어로 발달하였다. 부화 후 78일째 치어는 전장 55.86$\pm$1.26 mm, 체중 3,64$\pm$0.25 g으로 성장하였다.

• Proceedings of the KSAR Conference
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• 2003.06a
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• pp.87-87
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• 2003

본 연구는 개의 수태율 향상을 위한 인공 수정적기를 구명하기 위하여 발정개시 후 초음파를 이용하여 난소내 난포발달 상태를 진단하였다. 자연적으로 발정이 개시된 Greyhound 2두에 대해서 초음파기(SA 600S, 메디슨, 한국)와 3.SMHz probe를 이용하여 난포발달에 대한 초음파화상을 얻었다. 외음부가 종창하고 출혈이 확인된 첫날을 발정개시일(Day 1)로 하였으며 발정개시 후 11일째, 13일째 및 15일째 난포발달 상태를 조사한 결과 좌우 난소에 각각 3개 및 4개의 난포가 발달중에 있었으며, 난포의 크기는 좌우 각각 11일째에 6, 9, 17mm(좌측)와 6, 9, 6, 5mm(우측)였으며, 13일째에는 각각 10, 11, 11mm 및 9, 14, 13, 12mm였다. 15일째에는 이미 배란이 일어나서 난포상을 관찰할 수 없었으나 배란흔적은 관찰할 수 있었다. 본 실험에서는 발정개시 후 11, 13, 15일째 0.25$m\ell$ 주입기를 이용하여 그레이하운드 동결정액으로 인공수정하였으며, 이때 동결정액(좋은유전자 Co.)의 융해 후 활력 있는 정자수는 3$\times$$10^{7}$ spermatozoa/dose(0.25$m\ell$)였으며, 자궁경관내 주입기선단의 관통 여부를 촉진한 후 자궁내 정액 주입을 확인할 수 있었다. 난포발달에 대한 초음파 진단결과 Greyhound에 있어서 1회 인공수정시에는 발정개시 후 15일째가 높은 수태를 위한 수정적기라고 사료되었으며 이러한 결과는 Concannon 등(1989)이 배란 후 2일째가 수정적기로 판단한 연구 결과와 유사한 경향을 나타내었다.

• Journal of Aquaculture
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• v.7 no.2
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• pp.109-122
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• 1994

The cultured olive flounder larvae given nutrient enriched rotifer, Artemia nauplii and commertial micro diet were investigated the changes of lipid content, fatty acid composition and vitamin E content in whole body with growth stages in order to compare with those of the wild one. The results obtained are as follows. 1) Lipid and vitamin E contents of the cultured larvae were higher than those of the wild one. 2) Clear differences of fatty acid composition with growth stages, especially 18: 2n-6 and 22 : 6n-3, were recognized between the wild and cultured olive flounder larvae. 3) Changes of lipid content, fatty acid composition and vitamin E content were found to be affected by dietary composition given to fish. 4) The wild olive flounder larvae were found to obtain natural live foods containing of low lipid content and high concentration 22: 6n-3 based on the fatty acid composition of the fish.