• Journal of the Korean Data and Information Science Society
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• 제15권4호
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• pp.935-943
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• 2004

Most of the accelerated life tests deal with tests that use only one accelerating variable and no other explanatory variables. Frequently, however, there is a test to use more than one accelerating or other experimental variables, such as, for examples, a test of capacitors at higher than usual conditions of temperature and voltage, a test of circuit boards at higher than usual conditions of temperature, humidity and voltage. A accelerated life test is extended to M-level stress accelerated life test with k-stress variables. The optimal design for Weibull distribution is studied with k-stress variables.

• 대한수학회논문집
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• 제14권4호
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• pp.797-804
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• 1999

In this paper we derive the almost sure convergence of weighted sums of 2-dimensional arrays of random variables which are either pairwise positive quadrant dependent or associated. Our re-sults imply and extension of Etemadi's(1983) strong laws of large numbers for weighted sums of nonnegative random variables to the 2-dimensional case.

• 대한수학회보
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• 제57권1호
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• pp.51-68
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• 2020

In this paper, the author considers the nonparametric regression model with negatively orthant dependent random variables. The wavelet procedures are developed to estimate the regression function. For the wavelet estimator of unknown function g(·), the almost sure consistency is derived and the complete consistency is established under the mild conditions. Our results generalize and improve some known ones for independent random variables and dependent random variables.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 추계학술대회 논문집
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• pp.1588-1594
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• 2004

This study discovers the variables in the railway safety management which give impacts to safety cognition of the employees. Next we do factor analysis to find out latent variables which include safety variables and regression analysis to measure the explanation power of the latent variables. We got the results that expertness latent variable explains the variation of the accidents more than other latest variables

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2012년도 춘계학술발표대회
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• pp.1213-1214
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• 2012

Global variables can be read or modified by any part of the program, making it difficult to remember or reason about every possible use. Sometime it has tight couplings between some of other variables, and couplings between variables and functions. The main focus of this paper is to use call graph and the control flow analysis to design a model from where we generate the test cases for testing global variables.

• 자연과학논문집
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• 제17권1호
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• pp.51-54
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• 2006

확률변수의 랜덤 가중합에 대한 완전수렴 정리를 얻는다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.333-333
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• 2000

When the generalized singular perturbation method is used for model reduction, the state variables of the original system is reconstructed from the reduced order model. The state reduction error is defined, which shows how well the reconstructed state variables approximate the state variables of the original system equation.

• East Asian mathematical journal
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• 제30권3호
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• pp.361-369
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• 2014

The aim of this paper is to de ne hyperholomorphic function with dual octonion variables in $\mathbb{C}^4{\times}\mathbb{C}^4$. We characterize properties of dual octonion variables in Clifford analysis.

• 가정과삶의질연구
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• 제26권5호
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• pp.355-376
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• 2008

The purpose of this study was to investigate the variables that had an effect on the maturity of career attitude in middle school students. Independent variables were categorized into three groups: individual-related variables, family-related variables, and school-related variables. The individual-related variables were gender difference, academic year, academic achievement, and self-efficacy. The family-related variables were socio-economic status of the family, communication about career with parents, parental support, sibling's support, and value orientation of the family. The school-related variables included communication about career with friends, teacher's support, and friend's support. The subjects of this study were 490 students who were selected at random from first, second, and third grade of middle school in Daegu. A questionnaire was used for the survey. It consisted of a career attitude maturity scale, a self-efficacy scale, a communication scale, a value orientation of the family scale, and a social support scale. The data was analyzed by factor analysis, multiple regression analysis, and hierarchical regression analysis. The major findings of this study are summarized as follow: First, among the individual-related variables that had an effect on the maturity of career attitude in middle school students, self-efficacy affected all sub-factors of how mature they were in matters relating to career. Academic achievement affected decisiveness and preparation-- maturity of career attitude subfactors. And gender difference and academic year affected preparation and goal orientation. Second, the results of the family-related variables that had an effect on the maturity of career attitudes in middle school students were that communication about career with parents affected decisiveness, preparation, and confidence-- maturity of career attitude sub-factors, socio-economic status of the family and sibling's support affected confidence. And value orientation of the family affected goal orientation and independence. Third, the results of the school-related variables that had an effect on the maturity of career attitude in middle school students were that communication about career with friends affected preparation-- a maturity of career attitude sub-factor; teacher's support affected decisiveness, preparation, and confidence; and friend's support affected confidence and independence. Fourth, decisiveness, preparation, and confidence among the maturity of career attitude sub-factors were affected the most by individual variables. And self-efficacy was the most significant. Goal orientation and independence were affected the most by family-related variables.

• 가정과삶의질연구
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• 제20권3호
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• pp.125-138
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• 2002

The first purpose of this study is to inquire into the effect of new generation housewives'etiquette awareness on their etiquette implementation. For this purpose, this study will search the levels of new generation housewives'etiquette awareness and etiquette implementation, how the etiquette awareness and etiquette implementation vary according to their background variables, and the effect of new generation housewives'etiquette awareness as well as the background variables on their etiquette implementation. The major findings are as follows . First, the level of etiquette awareness was somewhat higher than that of etiquette implementation. Second, generally, their etiquette awareness didn't show a significant difference by the socio-demographic variables, but showed a significant difference by the psychological variables including communication level and humanism/materialism value orientation. Third, new generation housewives'etiquette implementation showed a significant difference only by monthly income like etiquette awareness. Meanwhile, as the psychological variables, etiquette implementation showed a significant difference by all Psychological variables except sex-role attitude. fourth, according to result of looking into relative influence of socio-demographic variables, psychological variables, and etiquette awareness about etiquette implementation, etiquette awareness was a significant variable which affects etiquette implementation.