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오근석,양재춘 충남대학교 1990 忠南科學硏究誌 Vol.17 No.1
We have investigated the nuclear fuel state analysis from the physical characteristics of unclear fission products in the reactor core which are produced by reaction between neutron and U^235. We set up H which is the ratio of the number of defective fuel rod to the mass of tramp uranium and calculate the contributed rate of radioactivities of iodine isotopes in primary coolant. We have measured the radioactivities of fission products in the primary coolant of nuclear power reactor and utilized the ratios of radioactivities of I^131 to I^133 and I^135 to I^133 in order to calculate the number of defective fuel rod and the mass of tramp uranium. The ratio of the number of defective fuel rod to the mass of tramp uranium is more sensitive to variation of the number of defective fuel rod than to variation of the mass of tramp uranium. The model which is considered by the radioactivities of fission products released from the defective nuclear fuel and from the tramp uranium in the primary coolant is confirmed appropriateness.
韓牛의 後産停滯 除去에 關한 實驗的 硏究 (直腸 Massage)
徐斗錫,金五南,林貞澤,韓邦根 제주대학교 1976 논문집 Vol.8 No.-
In this study on the elimination of fetal membrane using the rectal massage in retention of placenta occurred to 25 heads of korean Native cattle, I could get the following results. 1. The placental elimination using the rectal massage in rotention of placenta, was much better in sanifation I could eliminate the fetal membrane within short time, and find no disturbamces in breeding after the manipulation. 2. Through this experiment I could remove the fetal membrane completely in 80%, Partially left in 8% and in 12% I removed the fetal membrane was so thin that I couldn't seperate it from the maternal placenta. 3. It was better to the rectal massage about 63 hours after the parturition. 4. In this experiment I couldn't expect a good result in breasing the body temperature and mulnutrition of mother cow.
^40Ca(t,p)^42Ca 핵반응의 의곡파 보른근사에 의한 미분단면적 계산
안정선,양재춘,오근석,김성현 충남대학교 자연과학연구소 1993 忠南科學硏究誌 Vol.20 No.1
Differential cross section of double-stripping nuclear reaction has been calculated with distorted wave Born approximation(DWBA) in ^40Ca(t.p)^42Ca reaction. The angular distribution shape of differential cross section shows large peak in forward. And it has small oscillation. It determines the angular momentum transfer and then the final state of the nucleus is predicted by the angular distribution. In the ^40Ca(t.p)^42Ca reaction, the angular momentum L of the transfered neutron pair from triton is equal to the total angular momentum of the final state nucleus ^42Ca and the parity of the final state is even.
서울의 Penicillinase Producing Neisseria Gonorrhoeae 발생빈도(1996)
김재홍,황동규,전재홍,김윤석,김중환,김용준,이창균,임동진,김현수,조창근,김경문,박상훈,전우형,김희성,이호정,차명수,김갑형,김형석,김석우,황지환,박병순,권오상,이민수,송기훈,성소영,이인섭,부태성 대한화학요법학회 1999 대한화학요법학회지 Vol.17 No.2
Background : In recent years, gonorrhea has been panedemic and remains one of the most commom STDs in the world, especially in developing countries. Objective & Methods: For the detection of a more effective therapeutic regimen and assessing the prevalence of PPNG, we have been trying to study the patients who have visited the VD Clinic of Choong-Ku Public Health Center in Seoul since 1980 by means of the chromogenic cephalosporin method. Results: In 1996, 139 strains of N. gonorrhoeae were isolated, among which 53(39.0%) were PPNG. Conclusion: Our results suggests that after a peak of 74.3% in 1993, the prevalence of PPNG in Seoul is gradually declining.
Possible Impact of Urbanization on Extreme Precipitation-temperature Relationship
Seok-Geun Oh,Seok-Woo Son,Seung-Ki Min 한국기상학회 2021 한국기상학회 학술대회 논문집 Vol.2021 No.10
This study investigated the possible impact of urbanization on the summertime extreme precipitation-temperature(P-T) relationship in East Asia. The local climate in three megacity regions-Guangdong in China, Seoul/Gyeonggi in Korea, and Tokyo in Japan-was examined by analyzing a high-resolution dataset of in situ measurements for the period 1973-2015. All three megacity regions exhibited statistically significant positive trends in mean and extreme temperature and precipitation; the exception was the seasonal mean precipitation in Tokyo, which showed no clear long-term trend. The P-T relationship of extreme precipitation changed sharply across the breaking point where the maximum precipitation intensity occurred. The breaking point occurred at a higher temperature in urban areas than in rural areas, with a stronger extreme precipitation intensity. However, extreme precipitation at relatively cold temperatures exhibited the opposite relationship, with weaker urban precipitation than rural precipitation. This urban-rural contrast has become more pronounced in the recent decades, with more intense extreme precipitation in urban areas than in rural areas at temperatures around the breaking point. This result suggests that rapid urbanization has likely contributed to the intensification of extreme precipitation in East Asia.
Deep Learning for Very Short-term Rainfall Forecast
Seok-Geun Oh,Chanil Park,Seok-Woo Son,Kijung Shin,Seon-Young Kim,Hyesook Lee 한국기상학회 2021 한국기상학회 학술대회 논문집 Vol.2021 No.10
This study evaluates the performance of a deep-learning model developed, namely Deep-learning based Rain Nowcasting and Estimation (DEEPRANE), for very short-term (i.e., 1-6 h) rainfall forecast. The June-September 2020, when had the record-breaking summer rainfalls in South Korea, is tested. Hourly rainfall datasets obtained from 705 in-situ observations are used in the evaluation. Overall, DEEPRANE can adequately predict two rainfall classes-moderate rainfall events (MREs; ≥ 1 mm h<SUP>-1</SUP>) and strong rainfall events (SREs; ≥ 10 mm h<SUP>-1</SUP>) with a critical success index (CSI) higher than approximately 0.6 and 0.4 at the lead time of 1 h, respectively, for all observations. In the early morning hours when the highest rainfall peak appears in the bimodal rainfall cycle, DEEPRANE shows better performance for both MREs and SREs forecasts. In contrast, in the late afternoon-early evening hours when the second-highest rainfall peak is observed, it shows a slightly lower performance due to significant overestimation, especially for long lead times, 4-6 h. Probability of detection (POD) scores for MREs forecast always show higher than the false alarm rate (FAR) for all lead times, suggesting that DEEPRANE-based MREs forecast can be useful even for a long lead time of 6 h. For the SREs, POD becomes smaller than FAR for the lead time longer than 2 h. The DEEPRANE performance is further evaluated to the localized heavy rainfall events (LHREs; ≥ 30 mm h<SUP>-1</SUP>). It shows stable performance, irrespective of five different types of LHREs, suggesting the potential possibility of DEEPRANE-based LHREs forecast. This study will ultimately contribute to professionalizing a deep-learning rainfall forecasting system specialized to Korean summer monsoon period (i.e., Changma) to protect public safety.