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마이크로파 ZST 세라믹을 이용한 Helical Antenna 개발
이종배,육영진,신호용,김형순,임종인,Lee, Jong-Bae,Yook, Young-Jin,Sin, Ho-Yong,Kim, Hyung-Sun,Im, Jong-In 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.4
In this study, helical antenna with microwave ZST ceramics was designed using finite element method and developed. Studied parameters are relative dielectric constant of the dielectric core and the width of the conduction metal band of the antenna. As shown in the results, the center frequency of the antenna was decreased as the dielectric constant increased. Also beam width of the antenna increased as both the dielectric constant and the conduction band width increased. Based on the designed optimal shape, the manufactured antenna has the good beam width at center frequency 1.58 GHz.
무결정결함영역을 유지하면서 에너지를 절감하는 초크랄스키 실리콘 단결정 성장로 수냉관 최적 설계
채강호(Kang Ho Chae),조나영(Na Yeong Cho),조민제(Min Je Cho),정현준(Hyeon Jun Jung),정재학(Jae Hak Jung),성수환(Su Whan Sung),육영진(Young Jin Yook) 한국태양광발전학회 2018 Current Photovoltaic Research Vol.6 No.2
Recently solar cell industry needs the optimal design of Czochralski process for low cost high quality silicon mono crystalline ingot. Because market needs both high efficient solar cell and similar cost with multi-crystalline Si ingot. For cost reduction in Czochralski process, first of all energy reduction should be completed because Czochralski process is high energy consumption process. For this purpose we studied optimal water-cooling tube design and simultaneously we also check the quality of ingot with Von mises stress and V(pull speed of ingot)/G(temperature gradient to the crystallization) values. At this research we used CG-Sim<SUP>Ⓡ</SUP> S/W package and finally we got improved water-cooling tube design than normally used process in present industry. The optimal water-cooling tube length should be 200mm. The result will be adopted at real industry.