• 응용통계연구
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• 제30권4호
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• pp.555-566
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• 2017

다변량 자료에서 변수 수 p가 큰 경우 주성분분석 등 통상적인 차원축소는 효과적이지 못할 수 있다. 효과적인 시각화가 되려면 축소공간의 차원이 2-3 정도이어야 하는데, 관측개체의 잠재적 차원이 이보다 훨씬 큰 경우가 있기 때문이다. 이 논문은 분석변수들을 다수의 잠재 차원에 분할하여 차원축소적 방법으로 탐색하고 부분들의 유기적 관계를 시각화하는 이단계 작업을 제안한다. 분석변수들을 잠재 차원에 분할하는 "잠재변인 변수군집화" 방법으로는 R팩키지 ClustOfVar를 쓰고 개별 변수군집의 시각화를 위해서 주성분분석 행렬도(biplot)를, 개별 변수군집과 외부 잠재변인 또는 외적 변수 간 관계의 시각화를 위해서는 추가변수 끼워넣기(embedding supplementary variables) 기법을 활용한다.

• 아동학회지
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• 제22권1호
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• pp.35-49
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• 2001

The purpose of this study was to identify how characteristics of children, parents, and the family context relate to parental disciplinary practices and to examine the effects of cumulative positive variables on effective parental disciplinary practices. Subjects were 220 each mothers and fathers of 6-year-old children. Data were analyzed with correlation, multiple regression, and chi-square. Both Maternal and paternal disciplinary practices were correlated with child birth order, child emotionality, attention span and persistence, perceived social support and quality of life, and retrospective punitive parenting. Perceived quality of life and social support were predictive of maternal disciplinary practices and child emotionality was predictive of paternal disciplinary practices. Both mothers and fathers exposed to several positive variables were much more likely to exhibit effective disciplinary practices than parents exposed to no positive variables. Findings were generally consistent with Belsky's(1984) process model of parenting.

• 한국감성과학회:학술대회논문집
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• 한국감성과학회 1997년도 한국감성과학회 연차학술대회논문집
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• pp.47-52
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• 1997

This study was carried out to investigate effects of fabric properties and the changes of microclimates on comfort sensations and to identify effective varuables on clothing wear comfort sensations. A wied range of nontreated and functionally treated woven fabrics, knits, and nonwoven fabrics and test garments made of them were used as specimens. Linear structural equation was used to analyze causal relation among the variables on a path diagram. The results were as follows: 1. Almost of causal relations among variables were significant excdpt the effects of fabric properties including air permeability and water-vapor permebility on the changes of microclimate temperature. 2. Fabric properties were most effective variables on clothing wear comfort sensations including thermal sensation, subjeceive wettedness, and overall comfort and therefore comfort sensations and fabric properties were identified for improving clothing comfort.

• 한국응용과학기술학회지
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• 제37권5호
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• pp.1190-1199
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• 2020

본 연구의 목적은 골프 입문자들을 대상으로 12주간 훈련을 통하여 수행한 스윙에서 유효타에 미치는 변인들을 분석하고, 이를 통하여 골프 입문자들의 페어웨이 안착을 위한 유효타 요인의 기초자료를 제공하고자 한다. 본 연구의 대상은 골프 경험이 없는 입문자로 대학생 20명이 연구에 참여하였다(연령: 21.35±1.69yrs, 신장: 176.75±7.99cm, 체중: 70.70±9.76kg). 모든 대상자에게 12주간 골프 지도법에 따른 프로그램을 실시하였고, 12주차에 트랙맨 4를 이용하여 골프 스윙 시 유효타에 미치는 변인들을 산출하였다. 트랙맨 자료는 클럽 변인과 볼 변인으로 구분하여 유효타에 영향을 미치는 변인을 알아보기 위하여 이분형 로지스틱 회귀분석을 실시하였다. 클럽 변인에서 높은 다이나믹로프트(p<.01)와 낮은 페이스앵글(p<.05)은 유효타에서 나타났고, 볼 변인에서 빠른 볼스피드(p<.01), 큰 스매시팩터(p<.001), 높은 런치앵글(p<.001), 많은 스핀레이트(p<.001)도 유효타에서 나타났다. 클럽 변인의 이분형 로지스틱 회귀분석 결과, 클럽스피드(p<.05)와 다이나믹로프트(p<.01)가 증가하면 유효타의 가능성이 증가하였고, 페이스앵글(p<.001)이 증가하면 유효타의 가능성이 감소하였다. 클럽 변인에서 유효타의 영향력은 다이나믹로프트, 페이스앵글, 클럽스피드 순으로 나타났다. 볼 변인에서는 런치앵글(p<.05)이 증가하면 유효타의 가능성이 증가하였고, 런치디렉션(p<.05)이 증가하면 유효타의 가능성이 감소하였다. 볼 변인에서 유효타의 영향력은 런치앵글, 런치디렉션 순으로 나타났다. 결과를 토대로 유효타의 확률을 증가시키기 위한 조건으로, 지속적인 연습을 통하여 스윙 시 높은 다이나믹로프트와 낮은 페이스앵글 구사를 통한 클럽스피드 증가가 필요하고, 이를 통하여 런치앵글 증가와 런치디렉션 감소를 통하여 유효타의 확률이 증가될 것으로 사료된다.

• Communications for Statistical Applications and Methods
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• 제21권2호
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• pp.161-168
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• 2014

In mixture experiments with process variables, we consider the case that some of process variables are either uncontrollable or hard to control, which are called noise variables. Given the such mixture experimental data with process variables, first we study how to search for candidate models. Good candidate models are screened by the sequential variables selection method and checking the residual plots for the validity of the model assumption. Two methods, which use numerical optimization methods proposed by Derringer and Suich (1980) and minimization of the weighted expected loss, are proposed to find a cost-effective robust optimal condition in which the performance of the mean as well as the variance of the response for each of the candidate models is well-behaved under the cost restriction of the mixture. The proposed methods are illustrated with the well known fish patties texture example described by Cornell (2002).

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2003년도 춘계학술대회논문집
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• pp.180-183
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• 2003

In this research, on-line model for prediction of effective strain distribution hi strip on finishing mill process is prescribed. It has been developed using several selected non-dimensional parameters and previously made average effective strain model via series of finite element process simulations, $\Delta$$\varepsilon$ was introduced to describe the effective strain distribution in strip. To confirm adequate non-dimensional variables uniqueness test was done. And to decide the order of polynomial in on-line model equation tendency test for each variables was done. The prediction accuracy of the proposed model is examined through comparison with finite element calculation results.

• 아동학회지
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• 제32권3호
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• pp.19-41
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• 2011

This paper was an examination of gender-specific behaviors in children and the types of bullying behavior among 1,181 fifth and sixth grade elementary schools student identified were then classified. Differences were identified in individual variables, family variables, and school variables. The data thus collected were subjected to descriptive and comparative statistical analysis using the SPSS software program. Our results showed that multiple discriminant analysis yielded a function of individual, family and school variables that proved effective in classifying bully, reinforcer, assistant, victim, outsider and defender types in boys. In girls, multiple discriminant analysis yielded a function of individual variables that was effective in classifying bully, reinforcer, assistant, victim, outsider and defender types.

• 공학교육연구
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• 제16권3호
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• pp.10-19
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• 2013

Recently, Korean universities have increased the number of English Medium Instruction (EMI) lectures in order to allow students to gain both specialized knowledge and enhanced English ability. Previous researches on effective EMI lectures have focused on exploring the effects of learners' cognitive and affective characteristics on learning outcomes. Whereas the input variables of learning have been investigated as predicting variables of effects in EMI lectures, there has been a few research for investigating process variables to yield learning outcomes. The purpose of this study is to analyze the structural relationships among variables affecting on learner satisfaction and effects. The participants are 209 engineering students from various majors. Independent variables are defined as English motivation, English competency, and English confidence, a mediated variable is Cognitive engagement, and dependent variables are Learning satisfaction and Educational effect perception. The results show that the relationships are statistically significant: learners' English competency & English confidence ${\rightarrow}$ Cognitive engagement ${\rightarrow}$ Learning satisfaction ${\rightarrow}$ Educational effect perception. Especially, the structural model confirms that the effect of learners' English confidence on Learning satisfaction and Educational effect perception is mediated by the level of learners' Cognitive engagement. Further, the implication for effective EMI lectures is discussed based on the observed research results.

• Journal of the Korean Data and Information Science Society
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• 제19권3호
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• pp.831-844
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• 2008

Since cooperatives consist of many distinct members in the management environment and characteristics, it is necessary to make similar cooperatives into a few groups for the effective risk management of cooperatives' mutuality bank. This paper is a priori research for suggesting a guidance for effective risk management of cooperatives with different management strategy. For such purpose, we propose a way to group the members of cooperative's mutuality bank. The 30 continuous variables which is relative to cooperatives' management status are considered and six factors are extracted from those variables through factor analysis with empirical consideration to avoid wrong grouping and to enhance the practical interpretation. Based on extracted six factors and additional 3 categorical variables, six representative groups are derived by the two step clustering analysis. These findings are useful to execute a discriminatory risk management and other management strategy for a mutuality bank and others.

• 경영과학
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• 제11권1호
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• pp.165-186
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• 1994

The increasing importance of end-user computing(EUC) is reflected in the proliferation of academic and practitioner literature on the subject. However, much of this literature assumes widely differing dimensions of EUC, which tends to make many researchers suggest different success factors for managing EUC. Moreover, the variables regarding EUC management have been considerably restricted in previous research. In order to overcome these problems, this study focuses on identifying EUC dimensions theoretically and deriving generic variables representing the mode of EUC management by factor analysis first. Then, based on these EUC dimensions and generic variables for EUC management, effective ways of managing EUC are hypothesized and tested empirically through a mail survey of end-users in 83 Korean business organizations. The results suggest that effective management of EUC should be different depending upon which dimension more importance is attached to in implementing EUC.