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박성수(Park Soung Soo),허훈(Heo Hoon),김성철(Kim Sung Chul),김상희(Kim Sang Hee),김승환(Kim Sung Hwan),박용정(Park Young Jung),최오룡(Choi O Rong),남상훈(Nam Sang Hoon),신진우(J. W. Shin),소준호(J. H. So),장원(W. Jang) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
고출력 펄스 전원으로 PFN Marx 펄스 전원공급장치를 설계 및 제작하였다. PFN Marx는 커패시터와 인덕터 그리고 스파크 갭과 전원을 공급하는 전원공급장치와 전류 인덕터로 구성하여 제작을 하였다. 여기에 사용하는 스파크 갭 스위치는 개스를 채우는 방식으로 개스의 압력을 조정하여 스위치의 스위칭 전압을 조정하여 준다. PFN Marx는 커패시터와 인덕터가 직병렬로 구성이 되며 펄스폭과 PFN의 임피던스를 결정하는 중요한 요소이다. PFN marx는 33단으로 구성을 하였으며 부하를 100Ω으로 설계 및 시뮬레이션을 통하여 제작하였다. PFN Marx 펄스 전원공급장치를 약 500 ㎸, 수백 ㎱까지 시험을 하였다. 본 논문에서는 PFN Marx 펄스전원장치의 설계 제작 및 시험에 대하여 고찰하고자 한다.
Zhou Lei,Rong Yuan,R W H PHO 가톨릭중앙의료원 가톨릭암센터 1997 암심포지움 Vol.- No.1
Osteosarcoma may be the result of malignant transformation of mesenchymal stromal cell and characterised by direct formation of osteoid or bone. They are morphologically heterogenous with histological diversity. They can therefore be classified be classified into fibroblastic (spindle cell predominant), osteoblastic (bone predominant), chondroblastic (cartilage or chondroid differentiation) or telangiectatic (vascular differentiation). This heterogenicity may reflect the various developmental stages of single cell strain or the mutation of single cell. Being cancer cell, they have escaped from normal cell cycle regulation. They invade and colonise territories with unregulated growth. They have predilection site in metaphyseal of long bone(e.g. distal femur and proximal humerus) arising de no-va as primary osteosarcoma of secondary to pre-existing conditions (Paget's disease, multiple enchondroma, bone infarct, bone irradiation, etc). They can also occur in extraskeletal tissue. The tissue that have high growth and reparative process appear to form an excellent environment or "soil" for the invasive osteosarcoma to develop with its uncontrolled growth and ultimately metastases to other organs.
PRODUCTION FROM FINE WOOL SHEEP IN THREE AREAS IN NORTHERN CHINA
Masters, D.G.,Purser, D.B.,Yu, S.X.,Wang, Z.S.,Yang, R.Z.,Liu, N.,Wang, X.L.,Lu, D.X.,Wu, L.H.,Rong, W.H.,Ren, J.K.,Li, G.H. Asian Australasian Association of Animal Productio 1990 Animal Bioscience Vol.3 No.4
The seasonal changes in production, the systems of management and the seasonal climatic and feeding conditions are described for three farms representative of the major areas for growing fine-wool sheep in northern China. At all farms, summer and autumn were seasons of rapid liveweight gain and wool growth. In the winter and spring, during lactation, liveweight declined wool growth decreased by approximately 70%, and fibre diameter by 4 to 8 microns. The wool produced was characterized by a very low clean wool yield (39-51%). Greasy fleece weights ranged from 4.5 to 8.0 kg and average diameter of wool fibres from 20.5 to 23 microns. The number of lambs born per 100 ewes mated ranged from 79 to 95, lamb weights ranged from 3.8 to 4.5 kg, and weaning weights ranged from 17 to 25 kg. Overall, the patterns of sheep production were similar to those found in seasonally arid environments (such as in the mediterranean climatic zone). Yield of clean wool and therefore clean fleece weights were far below those in most other fine-wool producing areas of the world.