• Journal of Korean Society of Industrial and Systems Engineering
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• v.22 no.50
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• pp.1-9
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• 1999

The purpose of this study is to establish a basis for assessing construct validity of measures used in organizational research. The classic Campbell and Fiske's(1959) criteria are found to be lacking in their assumptions, diagnostic information, and power. The inherent confounding of measurement error with systematic trait and method effects is a severe limitation for a proper interpretation of convergent and discriminant validity. The confirmatory factor analysis(CFA) approach overcomes most of the limitations found in Campbell and Fiske's(1959) method. However, the CFA approach confounds random error with unique variance specific to a measure. The second-order confirmatory factor analysis(SOCFA) was shown to harbor rather restrictive assumptions and is unlikely to be met in practice. The first-order, multiple-informant, multiple-item(FOMIMI) model is a viable option, but it may also be of limited use because of the large number measures.

• International Journal of Quality Innovation
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• v.7 no.1
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• pp.177-194
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• 2006

This research investigates the status of environmental design implementation in Taiwan's industries (Certified by ISO 14001) by employing questionnaire survey. The correlation between the degree of environmental design implementation in Taiwan's industries and the relevant entrepreneurial characteristics are examined. Twenty-six environmental design principles in four phases: design, manufacturing, sales and transportation, and disposal are used to define and assess the current status of environmental design. The data analysis methods applied to this research includes descriptive statistics, T-test, Chi-square test, and single-factor analysis of variance (ANOVA). It is evident that 21 out of the 26 environmental design principles are frequently and consistently employed by the manufacturers in Taiwan. The results indicate that environmental design implementation is becoming mature in Taiwan's industries.

• Journal of Korean Academy of Fundamentals of Nursing
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• v.20 no.2
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• pp.129-136
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• 2013

Purpose: This study was done to examine sexual autonomy of college students. Method: Between October 2012 and November 2012, data related to self-efficacy, health knowledge, attitude to sex, and sexual autonomy orientation, were collected by questionnaire from 232 students. The data analysis was performed using PASW (SPSS) 18.0 program, and included t-test, one-way ANOVA, Pearson correlation coefficients, and multiple stepwise liner regression analysis. Results: The results showed a positive correlation between self-efficacy and sexual autonomy (r=.56, p<.001), sexual health knowledge (r=.50, p<.001), and attitude to sex (r=.29, p=.001). These 4 variables accounted for 48.7% of the variance in sexual autonomy among college students. Conclusion: The results of this study indicate that there is a need to develop mental health nursing strategies for college students in order to provide effective counseling on sexuality and sexual health matters.

• Communications for Statistical Applications and Methods
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• v.27 no.1
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• pp.37-46
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• 2020

Recurrent event data frequently occur in clinical studies, demography, engineering reliability and so on (Cook and Lawless, The Statistical Analysis of Recurrent Events, Springer, 2007). Sometimes, two or more different but related type of recurrent events may occur simultaneously. In this study, our interest is to estimate the covariate effect on bivariate recurrent event times with zero inflations. Such zero inflation can be related with susceptibility. In the context of bivariate recurrent event data, furthermore, such susceptibilities may be different according to the type of event. We propose a joint model including both two intensity functions and two cure rate functions. Bivariate frailty effects are adopted to model the correlation between recurrent events. Parameter estimates are obtained by maximizing the likelihood derived under a piecewise constant hazard assumption. According to simulation results, the proposed method brings unbiased estimates while the model ignoring cure rate models gives underestimated covariate effects and overestimated variance estimates. We apply the proposed method to a set of bivariate recurrent infection data in a study of child patients with leukemia.

• The Journal of Korean Society for School & Community Health Education
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• v.16 no.3
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• pp.51-63
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• 2015

Objectives: This study addressed the relationship among communication skill, job satisfaction, and mental health level. Methods: The participants in this study were 222 public health center staff members at 9 community public health centers located in Seoul city and Gyeonggi province. Descriptive analysis, Pearson's correlation, and multiple regression were used for statistical analysis of the data. Results: The main findings are as follows: First, communication skill and job satisfaction showed a significant positive correlation with mental health level. Secondly, some components of mental health level generally showed positive correlations with communication skill and job satisfaction. Third, multiple regression showed that 22% of the variance in the mental health level was explained. Conclusions: Based on these results of this study, we suggested that specialized programs should be established to help in development of social arbitration for public health center staff.

• Journal of the Korean Operations Research and Management Science Society
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• v.25 no.4
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• pp.67-80
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• 2000

Symbiotic evolutionary algorithms, also called cooperative coevolutionary algorithms, are stochastic search algorithms that imitate the biological coevolution process through symbiotic interactions. In the algorithms, the fitness evaluation of an individual required first selecting symbiotic partners of the individual. Several partner selection strategies are provided. The goal of this study is to analyze how much partnering strategies can influence the performance of the algorithms. With two types of test-bed problems: the NKC model and the binary string covering problem, extensive experiments are carried out to compare the performance of partnering strategies, using the analysis of variance. The experimental results indicate that there does not exist statistically significant difference in their performance.

• Journal of KSNVE
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• v.8 no.2
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• pp.251-259
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• 1998

The motion of an aircraft landing gear over rough runway at variable speed is nonstationary. In this paper, a method for the computation of nonstationary response variance is presented which uses a state space form for the combination of landing gear and runway excitation. The dynamic characteristics of the landing gear under nonstationary random excitations has also been analyzed using the proposed method. The formulation is for linear systems of arbitrary order and allows any deterministic velocity history. It has been found by a series of simulation that correlation parameter, damping coefficients of landing gear and tire, and velocity profiles play a prominent role on the dynamic characteristics.

• Transactions of the Korean Society of Automotive Engineers
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• v.4 no.2
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• pp.115-126
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• 1996

In order to obtain the principal design data for developing the Autonomous Robot Vehicle(ARV), Sensitivity analysis on the trajectory error and friction force with respect to the dynamic parameters is performed. In the straight motion, the trajectory error has been proved to be much affected by the mass variance of the ARV while the lateral friction force is much affected by the location of the mass center. In the curved motion, the effect of mass and moment of inertia is considered importantly. In addition, the lateral offset gives more effect than the geometric dimension of the ARV on the trajectory errors and friction force.

• Journal of Korean Academy of Nursing
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• v.42 no.7
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• pp.1087-1094
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• 2012

Purpose: This study aimed to identify relationships between compassion fatigue, burnout, and turnover intention in Korean hospital nurses. Methods: In total, 142 hospital nurses were surveyed as part of data collection. Data related to compassion fatigue, burnout, and turnover intention were collected using a questionnaire between May 2011 and September 2011. The data analysis was performed using PASW 19.0 program, which included one-way ANOVA, independent t-tests, Pearson's correlation coefficient, and hierarchical regression analysis. Results: This study detected a positive correlation between compassion fatigue and burnout(r=.37, p<.001), and turnover intention(r=.55, p<.001). Compassion fatigue accounted for 29.6% of the variance for turnover intention among Korean hospital nurses. Conclusion: The results indicate that it is necessary to reduce compassion fatigue, and turnover intention among Korean hospital nurses.

• The Research Journal of the Costume Culture
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• v.5 no.1
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• pp.137-150
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• 1997

This study examined the effects of demographic characteristics (education, income level) on the relationships among knowledge of textile fibers, information searching behavior on textile fabrics, and information sources of textile materials in children's clothings. The subjects were 307 mothers with preschool children(4∼6years) in Seoul. Data were collected using a self-administered questionnaire and analyzed using T-test analysis of variance, corelations, and crosstabulation analysis. The results indicated that : (1) Educational levels of consumers had significant influences on knowledge of textile fibers, information searching behavior on textile fabric, and information sources of textile materials in children's clothings. (2) There were significant relationship between consumer's knowledge of textile fibers and information searching behavior on textile materials in children's clothings.