• International Journal of Reliability and Applications
• /
• 제15권2호
• /
• pp.125-150
• /
• 2014

Accelerated life tests (ALTs) are extensively used to determine the reliability of a product in a short period of time. Test units are subject to elevated stresses which yield quick failures. ALT can be carried out using constant-stress, step-stress, progressive-stress, cyclic-stress or random-stress loading and their various combinations. An ALT with linearly increasing stress is ramp-stress test. Much of the previous work on planning ALTs has focused on constant-stress, step-stress, ramp-stress schemes and their various combinations where the stress is generally increased. This paper presents an optimal design of ramp soak-stress ALT model which is based on the principle of Thermal cycling. Thermal cycling involves applying high and low temperatures repeatedly over time. The optimal plan consists in finding out relevant experimental variables, namely, stress rates and stress rate change points, by minimizing variance of reliability function with pre-specified mission time under normal operating conditions. The Burr type XII life distribution and time-censored data have been used for the purpose. Burr type XII life distribution has been found appropriate for accelerated life testing experiments. The method developed has been explained using a numerical example and sensitivity analysis carried out.

• 간호행정학회지
• /
• 제14권3호
• /
• pp.219-228
• /
• 2008

Purpose: The purpose of this study was to develop a measurement scale of nursing competence for nurses working in general wards, and to test the validity and reliability of the scale. Method: A methodological study design was used, consisting of 3 steps as conceptual framework decision, measurement items development, and testing of validity and reliability. In order to verify content validity, 16 experts reviewed the concept of each competences and measurement items. The developed measurement items were tested from 301 nurses in one hospital. Factor analysis and item analysis were applied to establish the scale's construct validity and reliability. Result: The final scale consists of nine dimensions with 70 items. The overall scale reliability had a Cronbach's alpha of 0.98, and the demensions Cronbach's alpha ranged from 0.88 to 0.95. The factor loading of construct validity was from 0.40 to 0.83. The explained variance from the 9 extracted factors was 70.93% of the total variance, and final factors were labeled as critical thinking, resources management and professional development, ability of ward management, application of nursing process, ethical accountability, respectful consideration, patient centered approach, crisis management, and leadership. Conclusion: This measurement scale can be utilized to evaluate nursing competence for nurses working in general wards.

• 대한간호학회지
• /
• 제36권3호
• /
• pp.449-456
• /
• 2006

Purpose: The purpose of this study was to investigate the influences of health perception, body image and sexual function on depression according to the menopausal stage in Korean middle aged women. Methods: Subjects were 182 perimenopausal and postmenopausal women who had not received hormonal replacement therapy. A five-item General HealthShort Form (SF-36) Health Survey Questionnaire (Ware & Sherbourne, 1992) was used to measure health perception. Body image was measured Semantic Differential scale, CES-D was used to measure the level of depression, and sexual function was measured by FSFI. Results: The subjects rated their health as 'moderate', their body image as 'moderate, and level of depression as 'high'. However, there were no significant differences in health perception, body image, and depression between perimenopasual and postmenopausal women. Postmenopausal women experienced lower levels of sexual function than perimenopausal women in sexual arousal, lubrication, orgasm, satisfaction, and pain. In stepwise regression analysis, 21.7% of variance in depression was shown to be perceived health and body image in postmenopausal women. However, in perimenopausal women, perceived health and sexual function explained 34.5% of variance in depression. Conclusion: These findings indicate that nurses must consider the menopasusal stage when counseling their patients.

• 대한간호학회지
• /
• 제38권4호
• /
• pp.593-602
• /
• 2008

Purpose: This study aimed to compare self-care behaviors and depressive symptoms between the young old (65-74 yr) and the old-old (75-84 yr) in low-income women with hypertension. Methods: This study used a descriptive research design. The subjects of this study were 136 elderly women over 65 yr living in D city. Data was collected from September to December 2007 through personal interviews using a questionnaire. The collected data was analyzed using the SPSS WIN 12.0 Program. Results: Self-care behaviors, functional status, and number of medications showed a significant difference between young elderly and middle elderly. There was a negative correlation between self-care behaviors and depressive symptoms. 52.2% of variance in self-care behaviors of young elderly and 76.8% of variance in self-care behaviors of middle elderly were explained by depressive symptoms, number of medications, and functional status. Conclusion: It is necessary to manage depressive symptoms to improve the self-care behaviors of low-income elderly with hypertension. Depressive symptoms need to be considered in planning hypertension programs for low-income elderly women.

• 재활간호학회지
• /
• 제10권2호
• /
• pp.125-133
• /
• 2007

Purpose: The purpose of this study was to identify motivational factors that may influence health behaviors of patients with coronary artery disease. Methods: Structured questionnaires were used with a convenience sample of 164 subjects who were discharged from the hospital. The subjects were recruited for an interview at outpatient clinic in hospitals. The tools for the study were the motivational factors and health behaviors measure for the Elderly with cardiovascular disease. The data were analyzed using frequency, t-test, ANOVA, sheffe, Pearson correlation coefficient and stepwise multiple regressions. Results: There were significant correlations between motivational factors and health behaviors, ranging from r=.192 to .692. Stepwise multiple regression analyses indicated that 51% of variance in health behaviors was explained by self-efficacy and perceived benefits among four motivational factors(F=34.988, p<.01). Self-efficacy contributed the greatest amount of variance in health behaviors(${\beta}=.467$), followed by perceived benefits(${\beta}=.235$). Conclusions: The results of the study indicate that motivation, especially self-efficacy, was very important in predicting health behaviors of patients with coronary artery disease. Thus it would be necessary to include motivational factors in designing rehabilitation program for people with coronary artery disease.

• 동서간호학연구지
• /
• 제21권1호
• /
• pp.69-77
• /
• 2015

Purpose: The purpose of this study was to investigate the variance of sleep quality and factors affecting sleep disturbance among patients with percutaneous coronary angiography in a general hospital. Methods: The subjects of this study was comprised of 101 patients with percutaneous coronary angiography in a general hospital located in B city. Data were collected by a structured questionnaire from November to December 2013. The data were analyzed with descriptive statistics, t-test, ANOVA, Pearson's correlation coefficient and stepwise multiple regression. Results: The levels of the participants' sleep quality and sleep disturbance were 4.35 and 5.91 in order of each out of the total score, 10. There was no significant difference in the quality of sleep between intensive care unit and internal medicine unit. Factors influencing sleep quality were 'uncomfortable bed, gown and pillow'(${\beta}=-.279$, p=.003), 'living alone'(${\beta}=-.273$, p=.003), and 'toilet problem' (${\beta}=-.222$, p=.016), which explained 21.5% of the variance (F=10.03, p<.001). Conclusion: The results of this study will provide a basis for improving the sleep quality of patients with percutaneous coronary angiography.

• International Journal of Human Ecology
• /
• 제2권1호
• /
• pp.77-94
• /
• 2001

This paper expands empirical research on family satisfaction by introducing the family APGAR scale, developed and validated in the field of nursing, to measure the satisfaction of business-owning families and applying the Stafford et al.(1999) model of sustainable family businesses to the assessment of family satisfaction. More specifically, this study compares the differences in the effects of business- and family-related variables on family satisfaction for the families of lifestyle business owners and earner business owners. The sample was drawn from the 1997 National Family Business Survey. The family satisfaction was greater for the families of lifestyle business owners, but the family variables made a greater contribution to the explanation of variance in the satisfaction of families of earner business owners. The regression equation explained a higher percentage of the variance for the families of earner business owners. Nine family variables were significant in the satisfaction equation for earner business owners, in contrast to seven significant family variables in the equation for lifestyle business owners. Structured families had a significant positive effect on the satisfaction of lifestyle business owners. The family manager's education, putting the family first rather than the business, and the family management score had significant effects on the satisfaction of earner business owners.

• 복식
• /
• 제53권7호
• /
• pp.29-36
• /
• 2003

The purposes of this syudy were to identify the factors of perceived risk, satisfaction, and intention on rental clothing. The subjects were 767 adults residing in Jeonbuk province. The research was made from February 20 to March 19, 2003. Fof data analysis. frequencies, percentages, mean, and standard deviations were calculated. Also, factor analysis and stepwise multiple-regression analysis were done. The results were as follows: 1. Approximately half of the respondents had experiences of rental clothing, and the most frequent items were wedding dress, degree gown, performance dress, and sports wear in descending order. 2. The factors of perceived risk of rental clothing were divided into lost, appropriateness, and damage, and total variance was 62.51%. The perceived risk about damage of rental clothing was the highest, and lost was the lowest. 3. The factors of rental clothing satisfaction were divided into appearances, store status, function, and fitness, and total variance was 59.96%. The satisfaction of function of rental clothing was the highest, and the store status was the lowest. 4. The intention on rental clothing was high in case of higher interest in rental clothing, higher educational level. more experiences in rental clothing, lower perceived risk of damage on the rental clothing, and younger person, and these variables explained 54.00% of the intention on rental clothing.

• 의학교육논단
• /
• 제20권3호
• /
• pp.156-163
• /
• 2018

The purpose of this study was to investigate the effects of academic resilience and interpersonal competence on the happiness of nursing students. A descriptive design was used to study 158 nursing students in nursing school through convenience sampling. IBM SPSS ver. 23.0 (IBM Corp., Armonk, NY, USA) was used to analyze data for descriptive statistics, t-test, analysis of variance, Tukey post hoc test, Pearson's correlations, and multiple regressions. The results showed that the level of nursing students' happiness was lower than that of college students in other majors, but academic resilience and interpersonal competence among nursing students were relatively high. Nursing students' happiness was positively correlated with academic resilience and interpersonal competence. The factors affecting happiness were academic resilience (${\beta}=0.459$, p<0.001), satisfaction with major (${\beta}=0.272$, p=0.006), perceived subjective health status (${\beta}=0.223$, p=0.013), and interpersonal competence (${\beta}=0.185$, p=0.003). Explained variance for happiness was 56.4%, and academic resilience was the most influential factor in the happiness of nursing students. Nursing students are caring human beings and should be able to pursue a happy life; therefore, it is necessary to improve satisfaction levels with the nursing major, guide students to excel in their academic achievement, prepare health education programs, and design curriculum that inspires confidence in interpersonal relationships.

• 성인간호학회지
• /
• 제16권1호
• /
• pp.102-110
• /
• 2004

Purpose: This study was done to identify the degree that perceived social support effects the self esteem of the elderly. Method: A structured questionnaire was administered to 203 elderly subjects from April 2003 to June 2003. The data were analyzed with an SPSS program for escriptive statistics, Pearson's correlation coefficients, t-test, ANOVA, and stepwise multiple regression. Result: The level of social support was moderate; family support received the highest score among sources of support. In types of support, appraisal support was the highest score and material was the lowest. The level of self esteem was also moderate. The score of social support showed a slightly high positive correlation with self esteem. In general characteristics, several variables were significantly related to self esteem. The most powerful predictor of self esteem was material support by family and the variance explained was 19.6%. A combination of material support by family, informational support by relatives, perceived economic status, perceived health status, and having a subject to depend on accounted for 39.8% of the variance in self esteem of the elderly. Conclusion: To increase the self esteem of the elderly, it is necessary to consolidate material support by family.