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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.
명시,암묵,유사과제학습이 배드민턴 기술수행 및 학습에 미치는 영향
김우종 ( Woo Jong Kim ),김진구 ( Jin Gu Kim ) 한국스포츠심리학회 2014 한국스포츠심리학회지 Vol.25 No.4
Purpose: The purpose of the study was to compare the effects of implicit, explicit, and similar task learning strategies on the performance and learning of a badminton overhead stroke skill. Methods: Participants were 40 right handed male undergraduate students whose age ranged from 18 to 27, with a mean age of 21.5 years. They were randomly assigned into one of four experimental conditions: (1) explicit group, (2) implicit group, (3) similar task learning, and (4) a control group, respectively. The participants performed a badminton overhead stroke (receive returning) task for 40 times in the acquisition phase, 20 times in the retention phase and 20 times in the delayed retention phase a week later. A 4(groups)ⅹ4(types of learning phrase), 4(group) ⅹ2(types of learning phrase), and 4(group)ⅹ2(types of learning phrase) ANOVAs with repeated measures were used for the acquisition, retention and long term retention phases, respectively. Dependent variables were absolute error(AE) and variable error(VE). Results: The results of the study indicated that the explicit group, implicit group and the similar learning group presented less error score than the control group. Specially, the similar task learning group had less error score than the explicit group. In regard to variable error, the similar task learning group and the implicit group showed less error score than the explicit group and the control group. For the retention phase, the result indicated that the explicit group, implicit group and the similar task group had lower error score than the control group. For the long term retention phase, the result presented that the explicit group, implicit group and the similar task learning group had lower error score than the control group. Specially in absolute error, the similar task group showed lower error score than the explicit, implicit, and the control group. Taken together, the results of this investigation revealed that the implicit and similar task learning groups showed statistically less error than the control group. Although there were no significant differences between the similar learning group and the implicit condition, the similar task group has a tendency to decrease variable in acquisition and retention phases. Conclusion: The similar task learning strategy may have more potential to improve motor skill learning than those of explicit strategy.
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)