• Korean Journal of Animal Reproduction
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• v.23 no.3
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• pp.257-262
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• 1999

This study was carried out to evaluate the effect of pH and storage temperature on the viability of boar sperm diluted with extender KpA for swine artificial insemination. The results obtained in this experiment were summarized as follows : 1. The viability of boar sperm diluted with KpA was higher than that with BTS during storage and especially more than 60% of sperm viability in KpA was maintained through 6 days. The pH values of all extenders were kept during storage of semens following dilution. 2. The sperm diluted with acidic (pH 6.3~6.8) or alkalic (pH 7.8~8.0) KpA and stored at 4$^{\circ}C$ or 37$^{\circ}C$ were more sensitive in viability than that with neutral pH (6.8~7.3) and at 17$^{\circ}C$ storage. But pH values of all conditions were not increased rapidly. Especially acidic and alkalic diluents were more stable in pH after dilution. Conclusively, extender pH and storage temperature was the important factors for sperm viability. The KpA setting up around neutral pH was the optimal boar semen extender for maintaining liquid semen at 17$^{\circ}C$.

• Bulletin of the Korean Chemical Society
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• v.17 no.1
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• pp.90-93
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• 1996

• Proceedings of the Korean Nuclear Society Conference
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• 1996.11a
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• pp.53-58
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• 1996

국내의 17$\times$17형 원전연료는 종전의 KOFA 연료로부터 Westinghouse(WH)사 Vantage-5H (V5H) 연료로 대체중에 있으며, 울진 1,2호기의 경우 8주기부터 V5H 연료를 장전한다. V5H 연료는 연료 상하부를 천연우라늄으로 구성함으로써 축방향 농축도가 균일하지 않으므로 기존 FRAMATOME사의 2차원 노심운전분석코드체계 (CEDRIC-CARIN-ESTHER)로는 정확한 노심 분석이 불가능하다. 따라서, 본 연구에서는 V5H 연료가 장전되는 울진 1,2호기에 대한 3차원 노심분석을 위하여 WH사의 INCORE-3D와 TOTE 코드를 PC-Version으로 개발하여 기존 코드체계를 대체하였다. 또한 WH형 원전과는 상이한 형식을 갖는 울진 1,2호기의 중성자속 측정 자료를 INCORE 코드에 적합한 형태로 변환하기 위한 C2I 코드를 개발하고 울진 1호기 6주기의 실제 중성자속 측정 자료를 이용하여 검증하였다. 이들 개발 코드들을 울진 원전에 설치하고, 1호기 8주기 출력상승중 노심출력분포 측정시험(75% 및 100% 출력시험)에 적용한 결과 기술지침서 상의 모든 제한사항이 만족되며 코드성능 또한 만족함을 확인하였다.

• Journal of the Korean Applied Science and Technology
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• v.36 no.2
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• pp.676-684
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• 2019

The Pictet-Spengler reactions have widely known for the organic synthesis or biosynthesis of biologically active compounds, tetrahydro-${\beta}$-carbolines. We have developed the simple and efficient synthetic method for the synthesis of ${\beta}$-carbolines in water. Their chemical structures were characterized by nmr and UPLC/MS/QTOF. Calculated masses of compound 1 ($C_{17}H_{17}N_2$ 249.1392), 2 ($C_{17}H_{23}N_2$ 255.1861), 3 ($C_{19}H_{21}N_2O_3$ 325.1552) and 4 ($C_{19}H_{19}N_2O$ 279.1497) were almost identical with the detected masses of compound 1 (249.1315), 2 (255.1789), 3 (325.1460) and 4 (279.1364) respectively. Those synthesized four compounds showed strong antibiotic activity against the common E. coli.

• Honam Mathematical Journal
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• v.44 no.1
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• pp.17-25
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• 2022

The Hermite-Hadamard integral inequality for F_h-convex functions on time scales is established. The applicability of our results ranges from Optimization problems to Calculus of Variations and to Economics. Application to the Calculus of Variations on time scales is discussed.

• Journal of Life Science
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• v.30 no.9
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• pp.749-762
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• 2020

Influenza A viruses are circulating in a variety of hosts, including humans, pigs, and poultry. Swine influenza virus is a zoonotic pathogen that can be readily transmitted to humans. The influenza viruses of the 2009 H1N1 pandemic were derived from swine influenza viruses, and it has been suggested that the 1957 H2N2 pandemic and the 1968 H3N2 pandemic both originated in pigs. Pigs are regarded as a mixing vessel in the creation of novel influenza viruses since they are readily infected with human and avian influenza viruses. We isolated three novel H1N2 influenza viruses from pigs showing respiratory symptoms on a Korean farm in 2019. These viruses were reassortants, containing PA and NP genes from those of the 2009 H1N1 influenza virus in addition to PB2, PB1, HA, NA, M, and NS genes from those of triple-reassortant swine H3N2 and classical swine H1N2 influenza viruses circulating in Korean pigs. Mice infected with the isolated H1N2 influenza virus lost up to 17% body weight and exhibited interstitial pneumonia involving infiltration of many inflammatory cells. Results suggest that close surveillance to detect emerging influenza viruses in pigs is necessary for the health of both pigs and humans.

• The Korean Journal of Food And Nutrition
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• v.1 no.2
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• pp.64-67
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• 1988

Cadmium resistant cocobacillus B-17 from soil was tolerated up to 1600ug/ml of cadmium at agar plate and the strain B-17 was able to grow at 600ug/ml of cadmium at liquid medium after the lag phase being prolonged with lengthening culture time. Optimal pH of the strain was shown at pH7.0. The elimination frequency of cadmium resistance by 10ug/ml of acriflavin was 28%, and by 20ug/ml of ethidium bromide was 47%, respectively.

• The Korean Journal of Applied Statistics
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• v.17 no.1
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• pp.27-34
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• 2004

The Horvitz-Thompson(H-T) estimator is less efficient than PPS estimators in some cases. We use the two-stage variable transformation in order to remove the drawbacks and increase the efficiency of H-T estimator. We transform the auxiliary variable to use the Midzuno-Sen sampling scheme at the first stage. And the next stage, we also transform the study variable to reduce the variance of H-T estimator using the inclusion probability obtained from the first transformation. We compare the efficiency between a suggested modified H-T estimator and PPS estimators.

• Bulletin of the Korean Chemical Society
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• v.17 no.9
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• pp.820-826
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• 1996

The p2H dependence of the NMR chemical shifts of the proton signals of heme methyl groups and ionizable groups in the vicinity of the heme were investigated. The p2H titration of heme methyl signals in four macroscopic oxidation states by saturation tranfer method was performed in the range between p2H 5.2 and 9.0. While the p2H dependence of the heme methyl resonance in fully oxidized state was small, most resonances in the intermediate oxidation states showed certain shifts. Particularly, methyl resonances of heme 1 (sequential heme numbering) exhibited sharp p2H dependence in acidic range. β-CH2 of the propionate of hemes 1 and 4 were titrated in the range of p2H 4.5-9.0. Only the 6-propionate group of heme 1 was protonated in this p2H range and its titration curve was similar to those of methyl resonances of heme 1 in intermediate oxidation states. Analysis of the microscopic redox potentials showed that they change depending on p2H. The ionizable groups responsible for the p2H dependence of these potentials are 6-propionate of heme 1 in acidic range and His 67 in basic range.

• Korean Journal of Crystallography
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• v.9 no.1
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• pp.1-5
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• 1998

The complex[Cu(L)I2, 2H2O(1) (L:3,14-Dimethyl-2,6,13,17-tetraazatricyclo [14,4,01.18, 07.12]docosane) has been prepared and structurally characterized. The complex (1) crystallizes in the triclinic system, space group P1, a=8.400(1)Å, b=8.986(3) Å, c=9.156(1) Å, α=82.42(1)˚, β=73.61(1)˚ λ=81.04(2)˚, Z=1, R for 1926 observed reflections of [F0>40(F0)], measured at 288K, was 0.042. The tetracoordination around Cu atom of complex(1) is square plane and the average bond distance of Cu-N is 2.029 (11) Å. Both six-membered chelate rings adopts a chair conformation and the five-membered ring are gauche with the sec-NH centers having the RRSS configuration.