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삼각섬유연골 복합체 척골와 파열의 수술 기법: 관절경을 통한 비매듭성 봉합술
김재광,김재광 대한수부외과학회 2014 대한수부외과학회지 Vol.19 No.2
Knotless repair of triangular fibrocartilage complex has several advantages. All procedures for triangular fibrocartilage complex repair could be done under arthroscopy in this technique. In addition, this technique allows for repair of deep layers of triangular fibrocartilage complex down to fovea of the ulnar head. This article describes arthroscopic repair of the Palmer type 1B triangular fibro- cartilage complex tear using arthroscopic knotless technique. 비매듭성 봉합은 삼각섬유연골 복합체 파열의 치료에 몇 가지 장점이 있는데, 봉합을 위한 모든 과정을 관절경하에서시행하는 것이 가능하고 삼각섬유연골 복합체의 심부 파열 시 척골와에 직접 봉합하는 것이 가능하다. 본 논문은 삼각섬유연골 복합체가 Palmer type 1B의 형태로 척골와에서 파열 시 비매듭성 봉합 나사못을 이용한 수술적 봉합 방법에대해 기술하고자 한다.
김재광,황길찬,김석호,안주현 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.66 No.-
In this study, we firstly evaluate the effects of two different synthetic methods on the structural and electrochemical properties of LiMn0.4Fe0.6PO4, which is used as a composite active cathode material. The structural characteristics are investigated by XRD and Rietveld refinement. The composite produced by mechanical activation, comprising nano-sized spherical particles, shows better electrochemical performance, but the contribution of the Mn3+/Mn2+ redox couple in the sol–gel technique on electrochemical properties is higher than that of mechanical activation. The LiMn0.4Fe0.6PO4 prepared by sol–gel process has higher cycle stability because the property of manganese mainly affects the cycle performance on LiMnyFe1−yPO4.
김재광,한근식,윤연옥 통계청 2004 통계연구 Vol.9 No.1
가계조사에서 불가피하게 발생하는 단위 무응답의 처리 방법으로는 가중치 조정법이 주로 사용된다. 가중치 조정은 전체 표본집단을 여러 개의 무응답층으로 나눈 후에 각 무응답층에서 응답률을 추정하여 그 역수를 무응답 조정 승수로 계산한 후 기본가중치에 곱하여 최종 가중치를 산정하는 것이 일반적이다. 무응답층을 구성하는 방법은 층내 응답률이 동질적이 되도록 하는 방법과 층내 주요 변수값의 변동을 최소화 하는 방법으로 나눌 수 있는데 본 연구에서는 먼저 층내 응답률이 동질적으로 되도록 나눈 후에 주요 변수값의 층내 분산을 계산하여 층내 분산이 지나치게 크게 나타나는 무응답층에 대하여 층을 세분하는 방법을 사용하였다. 무응답 층의 결정에는 의사결정 나무의 하나인 CHAID 알고리즘을 사용하였고 그 후 여러 달의 자료에 대해 응답률의 동질성에 대한 검정을 카이제곱 통계량을 사용하여 검정하였다. 이와 같은 방법으로 최종 결정되어진 무응답 층에 무응답 가중치 조정법을 사용한 통계량을 구현하였고 그의 분산 추정법을 잭나이프를 사용하여 제안하였다. 또한 실제 자료를 사용하여 모의 실험을 통해 본 방법론을 기존의 방법론과 비교하였다. Nonresponse weighting adjustment is a commonly used technique in the analysis of household survey data with unit nonresponse. In nonresponse weighting adjustment, several weighting cells are formed and nonresponse adjustment factor computed from each cell is multiplied to the original base weight. The weighting cells are formed either to get homogeneous response probability within each cell or to minimize the within-cell variation for a few key items. In this study, the cells are first partitioned to get homogeneous response probability and then some of the cells with high variance of a key item are further partitioned to reduce the within-cell variation.CHAID algorithm is used in the actual implementation and a chi-square test is used to test the homogeneity of the response probability. After the cell formation is finalized, nonresponse weighting adjustment technique is applied to get final estimates and their variance estimates are computed using a version of jackknife method. A limited simulation study is also presented to compare the methods.
김재광 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.68 No.-
This study first investigates the effect of the choice of cation on three different ionic-liquid-based gel polymer electrolytes (ILPEs) with polyimide membranes. The preparation of three ILPEs based on electrospun membranes of PI and incorporating a room-temperature ionic liquid, 1-alkyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide complexed with lithium bis(trifluoromethylsulfonyl)imide, is described. ILPE-EMImTFSI has an ionic conductivity as high as 5.3 × 10−3 S cm−1 at 30 °C. Furthermore, it shows higher thermal stability and electrochemical oxidation stability compared to the other two ILPEs because of its stronger bonds. These results indicate that polyimide-based ILPE-EMImTFSI is a good candidate for use in high-safety rechargeable lithium metal batteries.
김재광,임두현,Johan Scheers,Jagath Pitawala,Susanne Wilken,Patrik Johansson,안주현,Aleksandar Matic,Per Jacobsson 한국전기화학회 2011 한국전기화학회지 Vol.14 No.2
In this study we have investigated the Li-ion coordination, thermal behavior and electrochemical stability of N-butyl-N-methyl-pyrrolidinium bis(trifluoromethanesulfonyl)imide (Py_14TFSI) with lithium bis(trifluoromethanesulfony)imide (LiTFSI) doping intended for use as electrolytes for lithium batteries. The ionic conductivity is reduced and glass transition temperature (T_g) increases with LiTFSI doping concentration. Also, the electrochemical stability increases with LiTFSI doping. A high LiTFSI doping could enhance the electrochemical stability of electrolytes for lithium batteries, whereas the decrease in the ionic conductivity limits the capacity of the battery.