http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
전문수 ( M. S. Chon ),황용하 ( Y. H. Hwang ) 한국분무공학회 2004 한국액체미립화학회지 Vol.9 No.4
N/A This paper describes the improvement of engine cooling system. To improve engine cooling performance, the authors approached in two ways. One is to increase water pump performance, changing of impeller shape and lightening of material were carried out. The second one is cooling efficiency rise, which were investigated with head gasket coolant flow passage optimization with flow visualization technique. The test results show that water pump performance was increased effectively, reduction of pump drive torque, and increase of pump flow-rate and pressure rise. Gasket hole pattern optimization test results represent an optimized head coolant flow which stands cross flow from exhaust to intake port side and small vortex were removed.
홍순찬(S.C.Hong),강경우(K.W.Kang),정우창(W.C.Jung),황용하(Y.H.Hwang) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
This paper deals with the development of IGBT stacks for cost reduction One stack is consist of 4 IGBTs in parallel. In the high- and mid-power converters, IGBT stacks are more suitable than single IGBTs in the aspects of total cost of semiconductor devices, time for purchasing, maintenance, radiation of heat, size of surge absorber and harmonic filter, frequency characteristics, and etc Problems accompanied by parallel construction are studied and solved Economical efficiency is discussed and field tests with rooky A UPS are carried out to verify the validity of the developed IGBT stacks.