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金元卿 울산대학교 1982 연구논문집 Vol.13 No.2
母數의 推定量으로서 標本資料와 補助資料를 함께 利用하는 比推定量은 標本統計量보다 推定量의 精度를 높일 수 있으나 一般的으로 不偏推定量이 되지 못한다. 本 硏究는 層化集落抽出인 경우의 不偏比推定量을 얻기 위해서 單純任意抽出에서의 「Hartely-Ross」의 不偏比推定量을 擴張하여 不偏分離比推定量과 不偏結合比推定量을 導出하였고 또한 各各의 分散을 구하여 有效性을 比較 分析하였다. Unbiased ratio estimators in stratified clusler sampling are presented. The two unbiased ratio estimators, separate unbiased ratio estimator and combined unbiased ratio estimator, are obtained by extension of the Hartely-Ross unbiased ratio estimator and their variances are developed by using the moments of bivariate sample cumulants. the relative efficiencies of these estimators with respect to the biased ratio estimators are investigated.
Aberrant Ovarian Artery Arising from the Common Iliac Artery: Case Report
김원경,양승부,구동억,김용재,장윤우,이재명 대한영상의학회 2013 Korean Journal of Radiology Vol.14 No.1
A 46-year-old Vietnamese woman received embolization therapy in order to control postpartum hemorrhage. Angiography revealed an aberrant ovarian artery arising from the right common iliac artery. Superselective catheterization and subsequent embolization of the aberrant ovarian artery and bilateral uterine arteries were performed. Precise knowledge of the anatomic variations of the ovarian artery is important for successful embolization.