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김우종,강기훈,Kim, Woo-Jong,Kang, Kee-Hoon 한국데이터정보과학회 2009 한국데이터정보과학회지 Vol.20 No.2
다차원척도법은 다변량분석에서 개체들을 대상으로 변수들을 측정한 후에 개체들 사이의 비유사성을 측정하고, 그 값들 혹은 반복하여 측정된 경우에는 그 값들의 평균을 이용하여 개체들을 저차원의 공간상에 도시화시켜 표현하는 분석방법이다. 본 논문에서는 응답자의 답변에 기초하여 비유사성을 측정할 때 이상치 또는 응답자의 답변이 불성실할 경우 발생하는 변이문제와 개체들 간의 거리에 대한 통계적 추론 문제에 붓스트랩 방법을 적용하는 내용을 다루고, 활용가능성을 무료일간지에 대한 유사성 평가 자료를 이용하여 실증적으로 분석하였다. Multidimensional scaling(MDS) is a statistical multivariate analysis technique that is often used in information visualization for exploring similarities or dissimilarities in data. In order to analyse and visualize data, MDS measures the dissimilarities between objects and uses them or their mean if they are repeatedly measured. When there exist outliers or when the variation of data is too large, we can hardly get reliable results on the research using MDS. In this paper, we consider the MDS based on bootstrap method when the variation of data is large. Standardized residual sum of squares is considered as measuring goodness-of-fit of the model. A real data analysis is include to examine our approach.
큰 관상동맥 병변에서 약물방출스텐트와 금속스텐트의 임상경과 비교
김우종 ( Woo Jong Kim ),조장현 ( Jang Hyun Cho ),정종혁 ( Jong Heok Jung ),이민근 ( Min Kun Lee ),윤재성 ( Jae Sung Yoon ),안용수 ( Young Soo Ahn ),황영준 ( Young Jun Hwang ),정홍명 ( Hong Myung Jung ),김수현 ( Su Hyun Kim ),김준 대한내과학회 2011 대한내과학회지 Vol.80 No.6
Background/Aims: Drug-eluting stents (DES) are superior to bare metal stents (BMS) in reducing restenosis rates across a wide range of patients and lesion subsets.This study compared the clinical outcomes of DES versus BMS in patients with large coronary Methods: The study compared 134 patients (59.9±10.6 years, 90 men, 44 women) who underwent single vessel angioplasty with DESimplantation in large vessels with 115 patients (60.3±8.9 years, 82 men, 33 women) who received BMS. The clinical outcomes at 12 months were compared between groups. The study end points were major adverse cardiac events (MACE), including cardiac death, nonfatal myocardial infarction, and the need for target vessel and target lesion revascularization. Results: The baseline clinical coronary angiography and procedural characteristics were similar in both groups. The duration of dual antiplatelet therapy was longer in the DES group than in the BMS group (240±2.7 vs. 348±1.7 days, p=0.042). During the 12-month clinical follow-up, MACE were observed in 13 patients (11.3%) with BMS and 12 patients (9.0%) with DES (p=0.486). Conclusions: For coronary stents implanted in large coronary arteries, DES seems to be more favorable, although no significant differences were observed in the clinical outcomes between DES and BMS during a 1-year clinical follow-up. (Korean J Med2011;80:664-671)