잔류응력으로 인한 패키지 기판 굽힘 변형량 예측

김철규,최혜선,김민성,김택수,Kim, Cheolgyu,Choi, Hyeseon,Kim, Minsung,Kim, Taek-Soo 한국마이크로전자및패키징학회 2013 마이크로전자 및 패키징학회지 Vol.20 No.1

본 연구는 유한 요소 시뮬레이션을 이용하여 계산한 시편의 곡률과 3D 스캐너로 측정한 곡률을 비교하여 패키지 기판 구조의 휨 거동을 예측하는 새로운 분석 방법을 제안한다. 패키지 기판은 프리프레그 경화나 구리 패턴 도금과 같은 다양한 공정을 거치면서 쉽게 휘게 된다. 기판의 휨이 어떤 공정에서 어느 정도 생기는지를 알아보기 위하여 다양한 종류의 시편을 제작하고 각 시편의 형상을 3D스캐너를 이용하여 측정하였다. 그 후 시편의 형상으로부터 film에 걸리는 잔류 응력을 휨을 이용한 수식으로부터 계산하였다. 패키지 기판에 들어가는 절연체는 수지와 서로 직교 존재하는 섬유의 다발로 구성되어 있는 복합재료로서 이방성을 띄게 되는데 이는 패키지 기판의 독특한 굽힘 거동을 일으킨다. 우리는 유한 요소 법에 의한 휨 변형을 시뮬레이션하고 측정 데이터를 이용하여 시뮬레이션 휨을 비교하였다. 측정된 휨으로부터 계산한 전해 구리 도금 응력은 약 58 MPa이다. 솔더 레지스트와 프리프레그의 경화 응력은 각각 실온에서 13 MPa 및 6.4 MPa 정도이다. This study presents new analysis method to predict bending behavior of packaging substrate structure by comparing finite element method simulation and measured curvature using 3D scanner. Packaging substrate is easily bent and deflected while undergoing various processes such as curing of prepreg and copper pattern plating. We prepare specimens with various conditions and measure contours of each specimen and compute the residual stresses on deposited films using analytical solution to find the principle of bending. Core and prepreg in packaging substrate are made up of resin and bundles of fiber which exist orthogonally each other. Anisotropic material properties cause peculiar bending behavior of packaging substrate. We simulate the bending deflection with finite element method and verify the simulated deflection with measured data. The plating stress of electrodeposited copper is about 58 MPa. The curing stresses of solder resist and prepreg are about 13 MPa and 6.4 MPa respectively in room temperature.

畜産經營과 糞尿處理

김철규,Kim, Cheol Gyu 환경보전협회 1986 환경정보 Vol.8 No.3

畜産經營과 糞尿處理

김철규,Kim, Cheol Gyu 환경보전협회 1986 환경정보 Vol.8 No.1

SOHO-IP 사업

김철규,Kim, Cheol-Gyu 한국데이터베이스진흥원 1998 디지털콘텐츠 Vol.4 No.-

SOHO-IP가 뭔가 물으시는 분들도 있겠지만 보통 우리가 알고 있는 대형통신망에서 정보제공자로 유통되고 있는 IP사업자를 일컫는 말이다. 좀더 쉽게 말하면 집이나 조그만 사무실에서 나만의 사업장을 만들어 여러 사람을 상대로 사실 정보를 파는 사람을 생각하면 좋을 것 같다. IMF 시대를 맞아 어떻게 사업을 준비해야 할지 살펴봤다.

학생(學生)의 정신건강(精神健康)

김철규,Kim, Cheol-Gyu 한국학교보건학회 1989 韓國學校保健學會誌 Vol.2 No.1

간호대학생의 환자안전에 대한 지식, 간호전문직관과 환자안전관리활동의 관련성

김철규,유하민,김혜원,남아연,노희성,방다솔,신진의,이아현,이은경,전한용,정세림,정유정,Kim, Chul-Gyu,Yu, Ha-Min,Kim, Hye-Won,Nam, A-Yeon,Roh, Hee-Sung,Bang, Da-Sol,Sin, Jin-Ui,Lee, A-Hyun,Lee, Eun-Gyeong,Jeon, Han-yong,Jeong, Se-Lim,Jung, 한국의료질향상학회 2018 한국의료질향상학회지 Vol.24 No.2

Purpose: The objective of this study was to identify the relationship between knowledge of patient safety, nursing professionalism and patient safety management activities of nursing students with clinical practical experience. Methods: Self-administered questionnaires survey on knowledge of patient safety, nursing professionalism, and patient safety management activities were conducted for the $3^{rd}-year$ and $3^{th}-year$ nursing students. 139 questionnaires were distributed, of which, 131 were used for data analysis. Results: The scores of nursing students' knowledge of patient safety, nursing professionalism and patient safety management activities were $6.76{\pm}1.26$, $65.11{\pm}7.97$ and $67.99{\pm}7.26$, respectively. Knowledge of patient safety differed significantly according to the grade. Nursing professionalism had a difference with major satisfaction, clinical practical satisfaction, and experience of patient safety accident. Patient safety management activities were positively correlated (p<.01) with knowledge of patient safety and nursing professionalism. Patient safety management activities increased significantly with increase in the scores of knowledge of patient safety and nursing professionals. The factors that were related to patient safety management activities of nursing students were knowledge of patient safety and nursing professionalism. Knowledge of patient safety and nursing professionalism were selected as significant variables for explaining the patient safety management activities of nursing students, of which the coefficient of determination was 9.8%. Conclusion: To promote patient safety management activities of nursing students, training programs for patient safety management activities are required. Also, there is the need to increase the knowledge of patient safety and nursing professionalism of nursing students using various educational method.

비누화법에 의한 폐 PET 의 해중합과 Recycling (Ⅰ)

김철규,이수민,윤오섭 ( Chul Gyu Kim,Su Min Lee,Oh Sub Yoon ) 한국폐기물자원순환학회(구 한국폐기물학회) 1993 한국폐기물자원순환학회지 Vol.10 No.3

국소 벽면 진동에 의한 난류경계층 유동 변화

김철규,전우평,박진일,김동주,최해천,Kim, Chul-Kyu,Jeon, Woo-Pyung,Park, Jin-Il,Kim, Dong-Joo,Choi, Haecheon 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.9

In this study, the modification of turbulent boundary layer flow by local wall vibration is investigated. The wall is locally vibrated using a wall deformation actuator, which moves up and down at the frequencies of 100Hz and 50Hz. Simultaneous measurements of the streamwise velocities in the spanwise direction are performed at several wall-normal and streamwise locations using an in-house multi-channel hot wire anemometer and a spanwise hot-wire-probe rake. The mean velocity is reduced in most places due to the wall vibration and its reduced amount becomes small as flow goes downstream. Interestingly, the mean velocity is found to increase very near the wall and near the actuator. This is due to the motion induced by the streamwise vortices which are generated by the downward motion of the actuator. In case of the streamwise velocity fluctuations, their magnitude increases as compared to the unperturbed turbulent boundary layer, and the increased amount becomes small as the flow moves downstream. The modified flow field at the forcing frequency of 50Hz is not much different from that of 100Hz, except the reduced amount of modification.

Pyridine 존재여부에 따른 Trans -3- hexene 의 오존 산화 반응

김철규,홍원표 ( Chul G . Kim,Won P . Hong ) 한국공업화학회 1992 공업화학 Vol.3 No.4

올레핀의 오존화 반응에서 보여지는 통상의 반응경로가 pyridine의 도움으로 modification될 수 있는지 여부가 검토되었다. 먼저, trans-3-hexene의 오존 산화 반응이 aprotic non-participating solvent인 n-pentane과 dichloromethane을 사용하여 시험되었다. 덧붙여, 올레핀의 오존 산화 반응에서 pyridine의 역할과 반응기구를 검토하기 위하여, monomeric과 polymeric ozonides의 염기성 촉매 분해반응이 시험되었다. 본 연구에서 반응 과정의 고찰뿐만 아니라 생성물의 정량, 정성 분석을 위하여 현대적인 분석 기기들이 사용되었다. 본 연구의 결과로서, Pyridine 무존재하 aprotic solvent에서 올레핀과 오존의 반응으로 주로 과산화물인 monomeric이나 polymeric ozonides가 생성되었으며, pyridine 존재하에서는 과산화물의 생성없이 propionaldehyde와 Criegee zwitterion의 자리옮김 생성물인 propionic acid가 주생성물이었다. 또한, trans-3-hexene의 오존 산화 반응에서 pyridine의 촉매작용에 의하여 trans-3-hexene의 Criegee zwitterion의 propionic acid로 이성화되는 것으로 사료된다. It was explored, whether the usual course of the ozonolysis of olefins can be modified with the help of pyridine. In the first step, the ozone oxidation of trans-3-hexene was performed with and without pyridine in the inert solvents n-pentane and dichloromethane. In addition, base catalyzed decompositions of monomeric and polymeric ozonides were also examined to identify the reaction mechanism. The reaction products were identified by modern analytical tools. The results of this work showed that reactions of ozone with olefins in the absence of pyridine in aprotic solvents gave, one hand, dominantly peroxidic products, namely monomeric and polymeric ozonides. The other hand, they in the presence of pyridine gave only the non-peroxidic products, namely propinonaldehyde and rearranged propionic acid without peroxidic products. It seems, also, that the pyridine-catalyzed isomerization of the Criegee zwitterion of trans-3-hexene to give propiornic acid takes place in the ozone oxidation of trans-3-hexene.

정신 질환은 왜 늘어 가고 있나

김철규,Kim, Cheol-Gyu 한국건강관리협회 1974 건강소식 Vol.2 No.12