http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
김성대,전기범,배세환,진병문,Kim, S.D.,Jeon, K.B.,Bae, S.H.,Jin, B.M. 한국결정성장학회 2008 韓國結晶成長學會誌 Vol.18 No.3
PZ와 PT를 각각 3층씩 그 순서를 달리하고 열처리 과정을 달리하여 4가지 시료를 만들었다. PZ와 PT를 독립적으로 열처리 한 시료들에서는 PZ와 PT가 독립적으로 존재하는 경향이 강한 반면 PZ와 PT를 동시에 열처리 한 시료들은 PZT 복합상이 존재하는 확률이 더 높아졌다. 후자의 경우 PT를 먼저 증착한 쪽이 더 안정적인 PZT 상을 만든다는 결론을 지을 수 있었다. Four different thin films were made by depositing PZ and PT in different stacking sequences. PZ and PT phases are preferably co-existed in sample A and C that are annealing after each coatings. The sample B and D, on the other hands, have tendency toward the PZT phase after co-firing the sample. The sample B that started from PT stacking first was more stable PZT phase than that of PZ first sample D.
김성대(S. D. Kim),성병호(B. H. Sung),강환국(H. K. Kang),김철주(C. J. Kim) 한국에너지학회 2003 한국에너지공학회 학술발표회 Vol.2003 No.-
For the present study, three heat pipes with different thickness of sintered metal wick were manufactured, and their operational performances, such as capillary limit and thermal resistance were tested and compared with theoretical predictions. Experimental results showed good agreement with those by the theoretical model, and that seemed to present that the sintering process we had developed in the present study was valid.
3.3kV(105A) COMPACT RACK TYPE 고압 인버터 시스템의 방열 성능 향상을 위한 열유동 해석
김선영(S. Y. Kim),김성대(S. D. Kim),유성열(S. R. Ryoo),유남규(N. K. You),김태범(T. B. Kim),홍찬욱(C. O. Hong) 한국전산유체공학회 2014 한국전산유체공학회 학술대회논문집 Vol.2014 No.5
With ever-rising concerns about saving of fossil fuel resource, there have also been an increasing demand for using of energy more efficiently. The electric motor driven inverters can be a great help to improve energy efficiency. They are used to control the motor speed to the actual need. Therefore the use of them can lead to reduce energy consumption. In particular, the medium voltage(MV) drive systems which are used for pumps, fans, steel rolling mills and tractions have widespread applications in the industry. They covers power ratings from 0.4MW to 40MW at the medium-voltage level of 2.3kV to 13.8kV. However, the majority of the installed MV drive systems are in the 1MW to 4MW range with voltage rating from 3.3kV to 6.6kV. Recently, they also have been required to reduce size and weight like other power electronic equipments. In this paper, we studied on the 3.3kV(105A) compact rack type inverter system for improving of cooling efficiency. At first, we confirmed the tendency of temperature to compare with computational simulation using ANSYS ICEPAK and actual experimental tests. And then we researched thermal performance improvement designs in order to reduce temperature of the transformer for the safe operation. As a result, we found out more efficient solution by thermal-fluid analysis.
3.3㎸(105A) COMPACT RACK TYPE 고압 인버터 시스템의 방열 성능 향상을 위한 열유동 해석
김선영(S.Y. Kim),김성대(S.D. Kim),유성열(S.R. Ryoo),유남규(N.K. You),김태범(T.B. Kim),홍찬욱(C.O. Hong),고한서(H.S. Ko) 한국전산유체공학회 2014 한국전산유체공학회지 Vol.19 No.3
With ever rising concerns about saving of fossil fuel resource, there have been an increasing demand for use of energy more efficiently. The electric motor driven inverters can be a great help to improve energy efficiency. They are also used to control the motor speed to the actual need. Therefore the use of them can lead to reduce energy consumption. In particular, the medium voltage(MV) drive systems used for pumps, fans, steel rolling mills and tractions have widespread applications in the industry. They cover power ratings from 0.4㎿ to 40㎿ at the ㎹ level of 2.3㎸ to 13.8㎸. The majority of the installed MV drive systems however, are in the 1㎿ to 4㎿ range with voltage rating from 3.3㎸ to 6.6㎸. But they are required to reduce size and weight like other power electronic equipments. In this paper, we studied on the 3.3㎸(105A) compact rack type inverter system for improving the cooling efficiency. At first, we confirmed the tendency of temperature with computational simulation using ANSYS ICEPAK and actual experimental tests. And then we researched thermal performance improvement designs in order to reduce temperature of the transformer for the safe operation. It can reduce temperature of transformer that using pipe type flow guide in the system. As a result, we found out more efficient solution by thermal-fluid analysis.