• Journal of the Korean Statistical Society
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• v.32 no.3
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• pp.271-288
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• 2003

In this paper, when the variance of the normal distribution is related to the mean, we develop noninformative priors such as matching priors and reference priors. We prove that the second order matching prior matches alternative coverage probabilities up to the same order and also it is a HPD matching prior. It turns out that one-at-a-time reference prior satisfies a second order matching criterion. Then using these noninformative priors, we develop a Bayesian test procedure for the equality of the means and variances of two independent normal distributions using fractional Bayes factor. Some simulation study is performed, and a real data example is also provided.

• Journal of Korean Academy of Nursing
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• v.38 no.2
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• pp.321-331
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• 2008

Purpose: To examine the relationship between body fat percentage (BFP) and N-K cell activity (NKCA) in Korean breast and rectal cancer patients just after diagnosis. Methods: With 35 subjects enrolled between November 2002 and May 2003, Bioelectrical Impedance Analysis was used to estimate BFP. FACS Analysis was used to measure N-K cell activity. The relationships between BFP and NKCA were identified by using curve estimation, simple regression, and multiple regression, Results: The mean BFPs of the subjects and all the sub-groups were higher than acceptable BFPs. Both the mean NKCAs of male and female subjects were lower than that of healthy women. NKCA was explained by BFP with a 14.9% variance in the total subjects (p<.05). There were significant negative relationships between BFP and NKCA after controlling age, type of cancer, and stage of cancer while no significant relationship was found after controlling for gender. The relationships between BFP and NKCA in the sub-groups of female, breast cancer, and stage I, and II were significant. The relationships between male, rectal cancer, and the stage III, and VI sub-groups were not identified, but they revealed a mild to moderate steep in curve estimation. Conclusion: Weight reduction could prevent the risk and advancement of breast and rectal cancer in Koreans.

• Journal of Korean Clinical Nursing Research
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• v.16 no.1
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• pp.17-26
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• 2010

Purpose: The purpose of study was to assess the health promoting lifestyle among hospital nurses and to investigate the relationships between the health promoting lifestyle, resourcefulness, and perceived health status. Methods: The subjects were 400 nurses working at three university hospitals. The data were collected by self-administered questionnaires from September 1st to September 30th, 2008. Results: The range of Health Promoting Lifestyle Profile (HPLP) was 71-185, the average score was 112.50, and the item mean was 2.16 (total 4). The range of resourcefulness was 9-50, and the average score was 16.56. The range of perceived health status was 4-13, and the averae score was 9.52. Health promoting lifestyle was showed significantly positive correlations with resourcefulness (r=.473, p<.001), and with perceived health status (r=.176, p<.001). The independent variables including resourcefulness, religion, working shift, sleeping hours, and exercise explained 58.6% of the variance of health promoting lifestyle. Especially, resourcefulness explained 53.2% of the variance of health promoting lifestyle. Conclusion: Resourcefulness was identified as the most important variable contributing to the performance of health promoting lifestyle.

• Journal of East-West Nursing Research
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• v.26 no.1
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• pp.100-107
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• 2020

Purpose: The aim of this study was to investigate the correlation between a motivation to volunteer, personality, and interpersonal relationships in nursing students. Methods: A descriptive study was conducted using self-reported questionnaires to collect data from 185 nursing students in C city from February 1 to 28, 2018. Data were analyzed using independent t-tests, one-way analysis of variance, and Pearson correlation coefficient with SPSS version 21.0. Results: The mean score were 3.18±0.54 of motivation to volunteer, 4.62±0.50 of personality, and 3.74±0.44 of interpersonal relationships. Motivation to volunteer was positively correlated with personality and interpersonal relationships. A significant positive correlation was also found between personality and interpersonal relationships. Conclusion: Based on study results, nursing students need an opportunity to understand the nature of human and respect others through participation in various volunteer activities, and to improve personality and interpersonal relationship. Nurse educators should focus on the positive benefits of volunteering for nursing students and the strategies for encougring volunteering should be incorporated into the curriculum.

• The Journal of Korean Academic Society of Nursing Education
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• v.20 no.4
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• pp.491-501
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• 2014

Purpose: Nursing is regarded as a female-dominated profession. However, the number of Korean males entering the field of nursing is increasing. This study examines which of the following factors influence professionalism in male and female student nurses: area of nursing, gender identity, gender stereotypes, satisfaction with the field, emotional intelligence, and interpersonal relationships. Method: In total, 133 male and 293 female student nurses were selected from four Korean provinces between July 2013 and February 2014 to participate in this study. The data were analyzed with descriptive statistics, t-tests, ${\chi}^2$-tests of independence, and multiple regression analyses using SPSS/Win 20 software. Results: In males, 47.4% of variance in nursing professionalism was accounted for by grades, interpersonal relationships, gender stereotypes, and satisfaction with the field. In females, 41.9% of variance in nursing professionalism was accounted for by satisfaction with the field, interpersonal relationships, area of nursing, age, emotional intelligence and grades. Common factors that influenced both genders included satisfaction with the field, interpersonal relationships and grades. Conclusion: Although males and females revealed no significant differences in overall mean scores of nursing professionalism, several factors influencing nursing professionalism did differ by gender. Therefore, gender-specific nursing educational and training programs may be necessary to promote professionalism among student nurses.

• Korean Management Science Review
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• v.29 no.3
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• pp.81-89
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• 2012

Since introduced by Vining and Myers in 1990, the concept of dual response approach based on response surface methodology has widely been investigated and adopted for the purpose of robust design. Separately estimating mean and variance responses, dual response approach may take advantages of optimization modeling for finding optimum settings of input factors. Explicitly assuming functional relationship between responses and input factors, however, it may not work well enough especially when the behavior of responses are poorly represented. A sufficient number of experimentations are required to improve the precision of estimations. This study proposes an alternative to dual response approach in which additional experiments are not required. An artificial neural network has been applied to model relationships between responses and input factors. Mean and variance responses correspond to output nodes while input factors are used for input nodes. Training, validating, and testing a neural network with empirical process data, an artificial data based on the neural network may be generated and used to estimate response functions without performing real experimentations. A drug formulation example from pharmaceutical industry has been investigated to demonstrate the procedures and applicability of the proposed approach.

• Atmosphere
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• v.21 no.3
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• pp.273-284
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• 2011

This study investigates the characteristics of satellite brightness temperature (TB) and rainfall intensity over the life cycle of convective cells. The convective cells in the three event cases are detected and tracked from the growth stage to the dissipation stage using the half-hourly infrared (IR) images. For each IR images the values of minimum, mean, and variance for the convective cell's TBs and the sizes of convective cells are calculated and also the relationship between TB and rainfall intensity are investigated, which is obtained using the pixel values of satellite TB and the ground rainfall intensity measured by AWS (Automatic Weather Station). At the growth stage of the convective cells, the TB's variance and cloud size consistently increased, whereas TB's minimum and mean consistently decreased. At this stage the empirical relationships between TB and rainfall intensity are statistically significant and their slopes (intercepts) in absolute values are relatively large (small) compared to those at the dissipation stage. At the dissipation stage of the convective cells, the variability of TB distributions shows the opposite trend. The statistical significance of the empirical relationships are relatively weak, but their slopes (intercepts) vary over life cycle. These results indicate that satellite IR images can provide valuable information in identifying the convective cell's maturity stage and in the growth stage, they may be used in providing considerably accurate rainfall estimates.

• Plant Resources
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• v.7 no.1
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• pp.54-59
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• 2004

This study was conducted to investigate the relationships between yearly variations of weather elements and productivity in rice. In addition, coefficients of correlation among yield and yield components were used to find out the relationships between weather elements and productivity. Coefficients of variance (C.V.) of air temperature mean was considerable with 25％, but the variation by duration of sunshine was small in May. Culm length and number of spikes were great with c.v. of 21.5, 16.4％, respectively. Coefficients of correlation between temperatures of cultivation in May and yield were positive correlations. Coefficients of correlation between precipitation and sunshine of cultivation period from Oct. to May and yield were negative correlations. Coefficients of correlation amount the culm length, number of spikes, 1,000 grains wt. of seed, and yield were positively significant at the level of 1 ％, respectively.

• Journal of Korean Academy of Nursing
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• v.35 no.4
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• pp.664-671
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• 2005

Purpose. This correlation study was undertaken to examine the relationships between daily life stress, self-efficacy and university student life adjustment and to analyze the self-efficacy affecting that university student life adjustment. Methods. 265 university students were recruited from several participating required undergraduate classes. They were surveyed as the subject of this study. Data collection was conducted through the use of questionnaires. Results. The university life adjustment level showed a maximum score of 9 with the mean score 5.22. A negative correlation was found between daily life stress and university life adjustment. Also, there was positively correlation between self-efficacy and university life adjustment. Self-efficacy and daily life stress accounted for $23\%$ of the variance in university student life adjustment. Conclusion. According to the results, self-efficacy is a useful concept in helping overall university life adjustment. Therefore, university student consultation office or nurse should consider the program based on self-efficacy in order to help university students to better adapt to university life.

• Journal of East-West Nursing Research
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• v.24 no.2
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• pp.154-162
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• 2018

Purpose: This study identifies the relationships between the perception of nursing ethics and biomedical ethics in Korean nursing students. Methods: A total of 311 participants with a mean of 20.93 years were recruited using a convenient sampling method. Data were collected using a self-reported questionnaire from May 2 to May 16, 2016. Results: Biomedical ethics were significantly different according to education of ethics. Nursing ethics among nursing students were significantly different according to gender and a view of the occupation. Positive correlations were found between the perception of biomedical ethics and nursing ethics. The perception of biomedical ethics was a significant predictor of nursing ethics with an explanatory power of 16.0% of the variance. Conclusion: The findings of this study may provide a basic data to understand the biomedical ethics among Korean nursing students.