http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
100 kVA GTO 전압원 인버터를 사용한 정지형 무효전력보상기
최남섭,조국춘,정구호 여수대학교 1998 論文集 Vol.13 No.2
A stactic VAR compensator using 100 kVA three-level GTO voltage source inverter is presented for high voltage, high power application. The phase angle of the voltage source inverter is controlled so as to compensate the reactive power of some three-phase load. This paper deals with the following topics: system description, circuit DQ modelling, main controller, power circuit. The experimental results show good characteristics for var compensation.
분산형 고속전철 차량 현가장치의 주요강성이 차량진동에 미치는 영향
백승국(Seung-Guk Baek),박기수(Ki-Soo Pack),신범식(Bum-Sik Shin),이래민(Rae-Min Lee),이상원(Sang-Won Lee),구자춘(Ja-Choon Koo),최연선(Yeon-Sun Choi) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The Korean high speed train (G7) is developed as a type of the concentrated-power train. The next generation high speed train is being under development as a type of distributed-power train. The architecture of a bogie of distributed-power train differs from the one of G7. Hence, a new architecture design is required for the distributed-power train. In addition to bogie, current EMU design should be modified for the application to the distributed-power train. It is difficult to apply making EMU to make distributed-power train. Since the current EMU is a low speed model. In this study a set of design parameter study has been performed for reduction of vibration. Although dynamics of a single power car is considered, the study result may implicate overall design strategy for next generation high speed train.
Park, Young-Guk,Kang, Sung-Koo,Kim, Won-Jin,Lee, Youn-Choon,Kim, Cheorl-Ho KYUNG HEE UNIVERSITY MEDICAL CENTER 2005 고황의학상 수상논문집 Vol.21-22 No.-
Cyclooxygenase-2 (COX-2) and tyrosine kinase, which are involved in the biosynthesis of prostaglandin E₂ (PGE₂) in mouse calvarial osteoblasts, are stimulated by cytokine interleukin-1β (IL-1β), tumor necrosis factor-α (TNF-α) and/or interleukin-6 (IL-6). IL-1β and IL-6 and, to a lesser extent, TNF-α, enhances COX-2 mRNA levels in calvarial osteoblasts. Simultaneous treatment with IL-6 and IL-1β and TNF-α resulted in enhanced COX-2 mRNA levels accompanied by the cooperative stimulation of PGE₂ biosynthesis compared to cells treated with IL-1β or TNF-α or IL-6 alone. In contrast, the presence of TGF-β reduced COX-2 mRNA level, PGE₂ biosynthesis and bone resorption induced by IL-1β, TNF-α, IL-6 or a combination thereof. However, neither IL-1β, TNF-α, IL-6 nor a combination of IL-1β, TNF-α, IL-6 enhanced COX-1 mRNA levels in calvarial osteoblasts. A novel Src tyrosine kinase inhibitor, Herbimycin A (HERB), reduced COX-2 mRNA levels as well as PGE₂ production induced by IL-1β, TNF-α and IL-6 or a combination of IL-1β, TNF-α, IL-6, whereas COX-1 mRNA levels remained unaffected. Finally, HERB was found to inhibit in vitro bone resorption. These results indicate that the cooperative effects of IL-β, TNF-α, IL-6 on PGE₂ production are due to the enhanced expression of the COX-2 gene and that tyrosine kinase(s) are involved in COX-2 signal transduction in mouse calvarial osteoblasts. Thus, the Src family of kinase inhibitors may be useful in treating diseases associated with elevated bone loss.