http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
주성분의 자기일치성에 기초한 다변량 대표관찰치의 기하적 표현
김기영,박용주,Kim KeeYoung,Park YongJu 한국통계학회 2005 응용통계연구 Vol.18 No.1
일변량 자료의 경우 대표관찰치는 사분위수 등에 기초하여 자료의 분포와 변이를 함축적으로 표현하기 위한 목적으로 사용되는 소수 개의 관찰치이다. Jones와 Rice(1992)는 다변량 자료에 대한 대표관찰치를 선택하기 위해 주성분분석에 근거한 방법을 제시한 바 있다. 이 연구에서는 주성분의 자기일치성을 이용하여 대표관찰치를 선택하고, 이를 표현하는 방안을 고찰한다. 기존의 방법에 의한 대표관찰치가 자료의 표본변이에 민감한 한편, 여기에서 제안되는 방법의 결과는 자기일치성을 가진다. Representative observations are useful to express explicitly the distributional variation of the data by a few selected observations corresponding to the quantiles in the univariate situation. Jones and Rice(1992) extended it to the multidimensional case by the principal component based method. This study introduces a modified version of Jones and Rice exploiting the self-consistency of principal components in expressing the chosen observation vectors. Compared to that of Jones and Rice, the suggested method tends to provide with less susceptible representative observations to the sampling variation of the data and the resulted vectors benefits from the self-consistency.
오비디우스 『변신이야기』의 에필로그(15.871~9)에 나타난 오비디우스 변신의 의미
김기영(Kim, Keeyoung) 한국외국어대학교 외국문학연구소 2013 외국문학연구 Vol.- No.51
This paper aims to investigate the meaning of the poets metamorphosis in the epilogue of the epic Metamorphoses. To accomplish this plan, this paper, first, examines the whole structure of the work. Next, this paper analyzes not only the narrative of the two myths, i.e. Arachnes metamorphosis and Orpheus death, but also the narrative of the apotheosis of Heracles, Aeneas, Romulus, and Caesar, which appears successively in the progression from myth to Roman history. This analysis demonstrates that the two main storylines converge in the epilogue of the work. One storyline depicts the metamorphosis of Arachne and the death of Orpheus. In this storyline, Arachne and Orpheus both represent artists configurating the Ovidian literary style. They both fall victim to power and violence, however, which signifies Augustan ideology. The other storyline is the successive apotheosis of Heracles, Aeneas, Romulus, and Caesar. In this narrative of apotheosis we are led to expect the impending apotheosis of the emperor August in the epilogue. Contrary to our expectations, the apotheosis of the poet Ovid appears instead. Therefore, the convergence of the two storylines in the epilogue serves to proclaim the fame and immortality of the poet Ovid. This leads to the conclusion that the Metamorphoses, which appeared to represent the inorganic accumulation of many individual myths by means of the principle of metamorphosis, turns out to emphasize the immortality and victory of poetry over power and authority.
당선 무효소송이 있는 선거에서 재개표실시에 관련된 통계적 모형
김기영 高麗大學校統計硏究所 1990 應用統計 Vol.5 No.1
This paper is concerned with probability of reversal in contested election when there are some irregularities in the form of attentional and/or unattentional misclassificaion in vote-counting process. A very simple probability model is constructed for this situation and some applications in this area look quite interesting and educational as well. Here the point is to obtain an approximate upper bound of probability that the plurality of one candidate over another is greater or equal to its observed value. The upper bound of the probability obtained may be used to measure the degree of necessity for recounting in disputed contested election. These results are actually considered as an extension of Harris (1988) model, where it is assumed that all errors are the results of fatigue, inattention, or carelessness. An example is also provided for illustration of this procedure and numerical results obtained are compared with those under Harris model.
최병진,김기영 高麗大學校統計硏究所 1994 應用統計 Vol.9 No.-
비율을 나타내는 벡터들로 이루어진 구성비율자료는 각 벡터의 원소들의 합이 1이 되는 제약을 가지고 있어 자료구조가 선형적인 형태를 보이지 않는 특성을 가진다. 주성분분석등의 선형적 다변량기법들을 구성비율자료와 같이 제약된 조건을 가지는 자료에 적용을 할 때 잘못된 해석과 추론이 이루어질 가능성이 있다는 사실이 인지됨에도 불구하고 실제에서는 그런 통계기법들이 폭넓게 적용되어 왔다. 이것은 본질적으로 제약조건을 가지는 구성비율자료에 적용할 수 있는 다변량기법들이 최근까지도 발전되지 못했기 때문이다. 여기에서는 구성비율자료에 관해 주성분분석을 함에 있어 이전에 사용된 방법과 Aitchison(1983)에 의해서 제안된 로그비 변환을 이용한 방법을 소개하고 모의실험을 통해서 이들을 비교해 보기로 한다. Compositional data found in many practical applications consists of non-negative vectors lying on p-dimensional simplex plane. It is known to be difficult to handle this type of data because of the unit-sum constraint and the characteristic of non-linear structure. However, the corresponding statistical approaches are not very abundant. Usual statistical procedures have been widely used even though the possibility of misleading results is recognized in applying the conventional multivariate methods. The main reason for this is, of course, the lack of proper methods available. We introduce a way of avoiding the difficulty by considering log-ratio transformation proposed by Aitchison. The results are compared with those from other methods through simulation studies.
Union-Intersection 원리하에서 내부적 독립성에 관한 연구
이광진,김기영 高麗大學校統計硏究所 1991 應用統計 Vol.6 No.-
This paper concerns with the algebraic and geometric characteristics of test statistics under union-intersection principle for internal independence among multivariate response variables. The union-intersection statistics are compared with other associated ones such as likelihood ratio statistics. It also investigates the Jacobian of the transformation from sample correlation matrix to its eigen values and vectors, which is used for the joint disribution of eigen values and vectors of sample correlation matrix under multivariate normality. Some simulation results have been included for the conjecture of null distribution of a 'single' union-intersection statistic suggested by Schuenemeyer and Bargmann(1978).
허명회,김기목,이재창,최종후,김기영 高麗大學校統計硏究所 1990 應用統計 Vol.5 No.1
The use of statististical methodologies is steadily increasing for decades in almost every scientific fields. However, many researchers apply statistical methods improperly, and thus it calls for serious attention from the statistical society. This study aims at following three points. First, the general problem related with the use of statistical methodologies is investigated. Second, a check list is developed for systematic review of statistical aspects of academic research papers. Finally, this check list is tested by being applied to two Korean scientic journals ; The Journal of Educational Research and The Korean Journal of Nutrition.