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김성태,차두열,강민석,조세준,장성필,Kim, Sung-Tae,Cha, Doo-Yeol,Kang, Min-Suck,Cho, Se-Jun,Jang, Sung-Pil 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.1
Air core based transformers have been designed, simulated and fabricated by using micromachining process for the application of wireless power transmission with the range of frequency from 1 GHz to 20 GHz. Fabricated transformers are the types of solenoid transformers with primary and secondary coils. the size of fabricated transformer is $1.1{\times}1.5{\sim}2.15\;mm$ including ground shield. Transformers have been measured by dividing two groups based on the turns ratio between primary coil and secondary coil which are 1:1 transformers(the number of turns of primary coil and secondary coil: 3/3, 5/5, 7/7) and l:n transformers(the number of turns of primary coil and secondary coil: 3/3, 3/6, 3/9). As a result of the measurement, the lowest insertion loss of transformers ranged from 2 dB to 2.8 dB according to the number of turns between primary coil and secondary coil. And the lowest insertion loss from the transformers was measured at the frequency from 7 GHz to 11 GHz according to the number of turns between primary coil and secondary coil. Based on the measurement data from the microfabricated transformers, the transformer with the 3/3 turns in the primary coil and secondary coil showed best performance compared to others in terms of lowest insertion loss, lowest insertion loss frequency and bandwidth.
전류모드에 따른 전해도금된 마이크로 비아의 전기적 특성 연구
차두열,강민석,조세준,장성필,Cha, Doo-Yeol,Kang, Min-Suck,Cho, Se-Jun,Jang, Sung-Pil 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.2
In order to get more higher integration density of devices, it is getting to be used more and more micro via interconnection lines for interconnecting layers or devices. However, it is very important to enhance the electrical characteristic by reducing the electrical resistivity of micro via interconnection line because it affects the reliability of packaging. In this paper, Micro vias were patterned with a diameter from 10 to 100 um by increasing the step of 10 um and 100 um height and were fabricated by micromachining technology to investigate the electrical characteristic of micro via interconnection lines. These micro vias were filled with copper by electroplating process with appling pulse current mode. And the electrical characteristics of micro via interconnection lines were measured. The measured value of electrical resistivity shows with a range from 20 to $26\;m{\Omega}$. This value from micro via interconnection lines fabricated by pulse current mode electroplating process shows better result than the resistivity from than micro via interconnection lines fabricated by DC mode ($31\;m{\Omega}$).
조지훈(Ji Hoon Cho),조찬영(Chan-Young Cho),장성필(Sung-Pil Jang),신동훈(Donghoon Shin),남진현(Jin Hyun Nam),정태용(Tae-Yong Chung) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.38
환경오염의 심화로 인해 환경오염원인 질소산화물을 제거하기 위해서 대부분의 산업용 연소 Plant에 SCR을 설치하고 있다. 본 연구는 Power Plant의 SCR 내부에서 유동 균일화를 위해 Guide Vane의 영향을 평가한 연구이다. Guide Vane의 설치 위치를 변경하여 배가스의 속도 분포를 촉매층에서 파악하였다. 본 연구에서는 SCR 내 배가스의 유동을 파악하기 위해 CFD 사용코드인 FLUENT 6.2를 사용하여 전산해석을 수행하였다. Guide Vane의 설치로 인하여 SCR 내 유동분포의 균일도는 향상 되었다. 또한 SCR 전단의 Guide Vane보다 후단의 Guide Vane이 SCR 내 유동 최적화에 우수한 것으로 판단된다.