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만성 신부전에서 캄슘 장 흡수율에 미치는 1a Hydroxycholecalciferol 의 효과
성기양(Ki Yang Sung),윤상임(Sang Im Yoon),이강욱(Gang Wook Lee),신영태(Young Tai Shin),노흥규(Heung Kyu Ro) 대한내과학회 1992 대한내과학회지 Vol.43 No.5
N/A Background: Renal osteodystrophy is a major problem in patients with CRF, especially in dialyzed patient. Deficiency of Vitamin D has a important role in the mechanism of renal osterodystrophy. Method: To investigate the effects of 1a (OH) K4 on the calcium metabolism in patients with chronic renal failure, the concentration of serum clcium, phosphorus, parathyroid hormone, the amounts of 24 hours urinary calcium, phosphorus and the rates of intestinal calcium absorption using radioactive 45Ca. 45Ca were measured before administration of la (OH) D3, 1 and 2 weeks after the administration of 1a (OH) D3, 1μg/day in 15 patients with chronic renal failure. The same parameters were measured in 13 healthy controls without medication. Results: 1) The intestinal absorption rate of 45Ca reached at the peak level between 60 and 120 minutes after oral intake of 5μCi of the 45Ca in both patients and controls. 2) The basal intestinal 45Ca absorption rate of the patients were lower than that of the controls (p<0.05) and intestinal 45Ca absorption rates were increased gradually with 1a (OH) D3, administration, especially in patients with low basal serum calcium concentration (< 8 mg/dl). 3) Serum calcium concentration were increased significantly in patients after medication (p<0.05), but serum phophorus, urine calcium and urine phosphorus were not changed. 4) Basal iPTH levels of the patients were markedly higher than controls and decreased significantly within 2 weeks in patient with administration of 1a (OH) D3, Conclusion: 1 a (OH) D3 administration in chronic renal failure is effective to maintain serum calcium level and to prevent renal osteodystrophy through increased intestinal calcium absorption and decreased PTH secretion.
고위도 북한 접경지역과 국내 벼도열병균 레이스 분포 분석
양정욱,김은영,정진교,강인정,김율호,김병주,양운호,허성기,정현정 한국식물병리학회 2023 식물병연구 Vol.29 No.3
한국은 오랫동안 벼 도열병 방제 연구를 진행해왔고 다양한방제 체계를 구축하고 있으나 벼 도열병은 지속적으로 변이가이뤄지기 때문에 항상 벼 도열병에 대한 예찰과 방제를 위한 연구가 필요하다. 북한은 남한으로의 벼 도열병 원인균이 유입될수 있는 주요 경로 중 하나임으로 북한에서 발생하는 벼 도열병의 균주 분포와 다양성 연구는 한국에서 발생할 수 있는 벼도열병 방제 연구에 중요한 자료일 수밖에 없다. 2018년도 철원과 수원에서 분리한 균주는 KI와 KJ의 점유율이 유사한 수준이었으나 이후 진행된 연구 결과에서는 레이스 분포에 변화가 나타났다. 수원은 2018년 KI/KJ 레이스의 점유율이 유사했으나2019년 2020년으로 갈수록 KJ레이스의 점유율이 높아졌고 전주의 경우 2019년 KJ/KI 레이스 점유율이 역전된 후 2020년까지 KJ 레이스의 점유율은 높게 유지되었다. 철원의 경우 2018년부터 2019년까지 KJ/KI 레이스 비율이 유사하였는데 2020년에는 거의 KJ 레이스만 분포하는 것을 발견하였다. 반면 고위도 지역인 중국 내 북한 접경지역인 단둥과 연길에서 분리한 도열병균의 레이스 분포를 비교 분석하면, 국내의 도열병 레이스 변화와 달리 2021년부터 2022년까지 중국의 북한 접경지역인 단둥과 연길에서는 KI 레이스가 우점이었다. 단인자 계통 저항성 검정 실험에서는 IRBL9-W, IRBLIR-24 계통이 국내와 고위도 북한접경지역 모두 공통의 저항성원으로 분류되었다. 비록 남한 및중국 내 북한 접경지역에서의 벼도열병균의 레이스 분석 연도의 차이가 있어 직접적인 비교는 어려우나 중국의 접경지역과남한의 벼도열병균 레이스의 지역간 비교는 도열병 방제 체계구축에 중요한 자료로 판단된다. To explore the distribution and the resistance reaction of rice blast pathogens that may occur in North Korea, rice blast pathogens in the North Korean border regions of Dandong and Yeon-gil in China and the North Korean border region of Cheorwon in South Korea were analyzed. In addition, comparative analysis was conducted with rice blast pathogen in Suwon and Jeonju, inland regions of South Korea. Resistance reactions above average were observed in monogenic rice lines (IRBLzt-T, IRBL9-W, IRBL20-IR24, and IRBLta-CP1) in Jeonju, Suwon, and Cheorwon from 2018 to 2020. In Dandong and Yeon-gil, the monogenic lines IRBLz5-CA, IRBL12-M, and IRBL19-A consistently showed resistance reactions for three years. Notably, IRBL19-A exhibited strong resistance. Race distribution analysis in South Korea indicated a shift from KI to KJ dominance from 2018 to 2020, while in the North Korean border regions of Dandong and Yeon-gil, the KI race was dominant in 2021 and 2022. The race distribution of rice blast pathogens in China's North Korean border regions differed significantly from that in South Korea.
17cc급 자동차용 압축기의 고체윤활 최적화 및 구조 설계에 관한 연구
양용군(Yong-Kun Yang),진진(Zhen Qin),최요한(Yeo-Han Choi),류성기(Sungki Lyu) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.12
Fuel economy has always been a major issue in the automobile industry, especially owing to the associated environmental concerns. It is widely known that only 5-20% of the energy generated by automobiles running on internal combustion engine engines is used as power, while the rest is consumed because of friction between components. The main components of the reciprocating piston type compressor used in vehicles, such as the shaft, swash plate, piston, and cylinder, cause severe energy loss owing to frictional contact between each other. The wear contact between the main shaft and the other components is particularly severe. Most quality issues arise owing to the sticking phenomenon that occurs between these parts. In this study, a coating solution to reduce friction is prepared by mixing adhesive solid lubricant, organic binder-polyadimide, inorganic binder (Binder), and graphite in four different ratios, and the best combination is determined.
17cc급 자동차용 압축기 핵심부품의 구조 안정성에 관한 수치적 연구
양용군(Yong-Kun Yang),우위팅(Yu-Ting Wu),진진(Zhen Qin),류성기(Sung-Ki Lyu) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.5
Fuel economy has always been a major issue for the automotive industry due to environmental concerns. In particular, it is known that only 5-20% of the energy generated in a car that mainly uses an internal combustion engine is converted to increase fuel efficiency, many methods have been proposed. Among these methods, weight reduction is most commonly used because it is the simplest and cheapest. Weight is always the main reason for energy consumption, therefore, reducing weight is the best way to increase fuel efficiency while simultaneously saving on material costs. To reduce the weight of a compressor, material substitution is used. However, aluminum (a lighter metal substitute) is more fragile than steel, therefore, structural stability must be verified through testing. In this paper, we performed a 3D analysis to investigate whether aluminum can be used without compromising structural stability. Our investigation included static analysis and thermal analysis. As a result, we found that an aluminum swash plate can be safely applied on a shaft instead of steel; it reduces weight while maintaining stability that is equal to or better than steel.