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박철균,이태호,이태경,정명영,Park, Chul Gyun,Lee, Tae Ho,Lee, Tae Kyoung,Jeong, Myung Yung 한국마이크로전자및패키징학회 2013 마이크로전자 및 패키징학회지 Vol.20 No.3
전자패키징 기술의 발전에 따라 패키지의 소형화는 집적화에 따른 열 소산 면적 감소로 인하여 패키지의 온도 상승을 초래한다. 온도 상승은 소자의 성능을 저해하여, 시스템 고장을 발생을 유발시키며 수명을 단축시킨다. 본 연구에서는 마이크로 패턴과 세미 임베디드 구조를 결합하여 열 소산을 극대화 시킬 수 있는 새로운 구조를 제안하여 열특성을 평가하였다. 제안 구조의 열특성 평가 결과, 기존 구조에 비하여 최대 온도는 $20^{\circ}C$낮았으며, 범프의 최대 응력은 20%이상 감소하여 제안 구조의 유효성을 확인하였다. According to advance of electronic packaging technology, electronic package becomes smaller. Miniaturization of package causes the temperature rise of package. This can degrade life of electronic device and generate the failure of electronic system. In this study, we proposed a new semi-embedded structure with micro pattern for maximizing heat dissipation. A proposed structure showed the characteristics which have maximum temperature lower than $20^{\circ}C$ compared with conventional structure. And also, in view of thermal stress and strain, our structure showed a remarkably low value compared with other ones. We expect that the new structure proposed in this work can be applied to an flip-chip package of the future.
박영남,정철호,박철균 大韓神經精神醫學會 1993 신경정신의학 Vol.32 No.4
The purpose of this study was to examine brain structural abnormalities in autistic children. The authors investigated C.T findings in 37 autistic children diagnosed by D.S.M-Ⅲ-R, and measured the first and second cerebroventricular ratio, right and left Evan's ratio in 37 autistic children and 30 non-autistic control children. Seven of 37 autistic children had abnormal CT findings, these abnormalities were asymmetry of lateral ventricle in 3 autistic children, carvum septum pellucidum in 1, effacement of cerebral sulci, obliteration of lateral cistern in 1, obliteration of left ambient cistern in 1, and megacisterna magna, arachnoid cyst in 1. In the comparison of first and second cerebroventricular ratio between autistic children and non-autistic patient control children, there was no significant difference. There was no significant difference between autistic children and non-autistic control children in the right and left Evan's ratio. The frequencies of autistic symptoms were compaired between autistic children with and without CT abnormalties, and abnormal language and no comfortseeking behavior were significantly frequent in autistic children with CT abnormalties.