• International Journal of Reliability and Applications
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• v.18 no.2
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• pp.45-63
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• 2017

In this paper, we have formulated optimum Accelerated Life Test (ALT) plan for a parallel system with two independent components using masked data with ramp-stress loading scheme and Type-I censoring. Consider a system of two independent and non-identical components connected in parallel. Such a system fails whenever all of its components has failed. The exact component that causes the system to fail is often unknown due to cost and time constraint. For each parallel system at test, we observe its system's failure time and a set of component that includes the component actually causing the system to fail. The stress-life relationship is modelled using inverse power law, and cumulative exposure model is assumed to model the effect of changing stress. The optimal plan consists in finding out the optimum stress rate using D-optimality criterion. The method developed has been explained using a numerical example and sensitivity analysis carried out.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.8
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• pp.294-303
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• 2017

As the elderly population increases, the prevalence of various geriatric chronic diseases and dementia diseases is also rapidly increasing; accordingly, dementia is becoming a major concern of our society. In this study, 48 elderly patients with mild cognitive impairment located in K district were selected from a group of experimental groups in one building and a control group in one building and evaluated for blood homocysteine levels and cognitive function changes after 4,8, and 12 weeks of taking vitamin supplements. The Chi-squared test, Fisher's Exact test, independent t-test, repeated measures ANOVA, contrast test, repeated measures ANCOVA, and Wilks' lambda test were utilized to analyze the data. The results revealed that the cognitive function of the experimental group was significantly higher than that of the control group at 12 weeks (p<0.05), and so, the experimental group higher than that of the control group (p<0.01), the effect of taking vitamins was significantly increased, indicating that homocysteine was decreased relative to the control group. Therefore, vitamin supplements may prevent decreases in cognitive functions and dementia among elderly patients with mild cognitive impairment.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.10
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• pp.313-323
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• 2018

This study was conducted to develop an individualized upper extremity exercise program for patients after mastectomy and evaluate its effectiveness. A nonequivalent control-group pretest-posttest design was used for this investigation. Research participants were patients with breast cancer who underwent mastectomy at two university hospitals (experimental group, n=17; control group, n=16). The experimental group received an individualized upper extremity exercise program three times a week for 7 weeks. Data were analyzed by the ${\chi}^2-test$, Fisher's exact test, Mann-Whitney U-test and Wilcoxon Signed Rank test using SPSS WIN 21.0. Inter-group comparison revealed significant differences between pre-test and post-test in hands behind the back, flexion, abduction, external rotation, internal rotation, and grip strength. Moreover, the experimental group showed significant improvements in hands behind the back, flexion, abduction, external rotation, internal rotation, and grip strength relative to the control. In conclusion, the individualized upper extremity exercise program was shown to be an effective intervention to improve physical functions in upper limbs and shoulders. Therefore, this program should be applied to patients after mastectomy in clinics since many patients have suffered from decreased physical functions in upper extremities.

• Journal of the Korea Convergence Society
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• v.9 no.2
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• pp.267-276
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• 2018

The purpose of this study was to verify the effectiveness of horticultural activities program for 4th grade nursing students' emotional intelligence and stress coping. The study method was a non-equivalent control group pretest-posttest design. Participants were recruited with 4th grade nursing students from two nursing colleges. They were assigned to the experimental group (n=29) or the control group (n=30) using a computerized blocked randomization. Horticultural activities program was consisted of 10 sessions which were 2 times a week for 80 mins at each session during 5 weeks. Pretest and posttest were used to measure emotional intelligence and stress coping using the same structured questionnaires. Data was analyzed using frequency analysis, descriptive statistics, ${\chi}^2-test$, t-test, Fisher's exact test, Kolmogorov-Smirnov, independent t-test and paired t-test. The result showed a significant difference that the experimental group's emotional intelligence(t=-3.33, p=.002) and stress coping(t=-2.35, p=.023) score was higher than the control group's. The results of this study suggests that the horticultural activities program is effective in terms of emotional intelligence and stress coping for $4^{th}$ grade nursing students.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.1
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• pp.732-738
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• 2020

This study examined the effects of hospice & palliative care education programs for nursing students, in terms of spiritual well-being and knowledge concerning advance directives. This is a quasi-experimental study of non-equivalent control groups, and includes a pre-test and post-test design. Data was collected between September to December 2018, enrolling third grade nursing college students attending a university in C city: 22 subjects in the experimental group and 27 subjects in the control group. The experimental group was provided the education as a regular subject, 2 hours a week for 7 weeks, for a total of 14 hours. Ed. Notes: I suggest you maintain any one unit for mentioning time. Hence, I changed 120 mins to 2 hours. Data were analyzed by X2 test, Fisher's exact, t-test, independent t-test, and paired t-test, using the SPSS 21.0 program. After attending the program, spiritual well-being showed a significant increase (t=2.80, p=0.009). However, there was no significant difference between groups in knowledge regarding advance directives (t=1.33, p=0.190). Our results indicate that the hospice & palliative care education program helps nursing students improve their score of spiritual well-being. We believe that these results contribute basic data for the future development of hospice-palliative care curriculum.

• Journal of Korean Academy of Nursing
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• v.39 no.3
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• pp.357-365
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• 2009

Purpose: This study was done to examine the effects of aromatherapy on stress and stress responses in adolescents. Methods: A two-group cross-over design was used for this study. The experimental treatment was aroma essential oil inhalation and the placebo treatment was carrier oil inhalation using a necklace. The sample included 36 female high school students. Fisher's exact test, t-test, and paired t-test using SPSS/WIN program were used to analyze the data. Results: Stress levels were significantly lower when the students received the aroma treatment compared to when they received the placebo treatment. The stress responses except salivary IgA levels were significantly lower when the students received the aroma treatment. Conclusion: Aroma inhalation could be a very effective stress management method for high school students. Therefore, it is recommended that this program be used in clinical practice as an effective nursing intervention for high school students.

• Women's Health Nursing
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• v.24 no.2
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• pp.126-137
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• 2018

Purpose: To evaluate the effectiveness of an experience-focused prenatal program on stress, anxiety, childbirth confidence, and maternal-fetal attachment for women in their first pregnancy. Methods: The participants were 57 pregnant women at 32 weeks or more of a first pregnancy who agreed to participate in this study. The data were analyzed with descriptive statistics, t-test, $x^2$ test, and Fisher's exact test using the SPSS 21.0 program. Results: The experimental group showed significant differences in stress, anxiety, childbirth confidence, and maternal-fetal attachment from the control group. Conclusion: The four-week experience-focused prenatal program can be used for women in their first pregnancy to reduce their stress and anxiety and to increase their childbirth confidence and maternal-fetal attachment.

• Korean Journal of Adult Nursing
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• v.18 no.5
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• pp.798-808
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• 2006

Purpose: The purpose of this study was to investigate the effects of aquatic exercise on rehabilitation in home stroke patients. Method: A quasi-experimental pretest and posttest design was used to examine the change of balance, ADL, IADL, pain, depression and self-efficacy atthe completion of 6-weeks aquatic exercise program. The subjects consisted of 25 adults who had a stroke. Thirteen experimental and twelve control subjects completed pre and post test measures. Outcome variables were balance, ADL, IADL, pain, depression and self-efficacy. Chi-Square test(Fisher's exact method) was used to examine the equality of the subjects and Wilcoxon Rank Sum Test used to examine the group difference by using SAS. Results: There was no significant difference in balance and depression between the two groups. However, there was a significant difference in ADL, IADL, pain and self-efficacy between the two groups. Conclusion: Aquatic exercise can improve ADL, IADL, self-efficacy and reduce pain. Therefore, further research is recommended by increasing the length of aquatic exercise and number of subjects, so that its effects can be more generalizable.

• Child Health Nursing Research
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• v.14 no.4
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• pp.379-387
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• 2008

Purpose: This study was conducted to investigate the effects of a psychomotorik program on the self concept, sociability and aggression in preschoolers. Method: The research design was a nonequivalent control group pretest-posttest design. There were 34 subjects in the experimental group and 34 in control group among 68 preschoolers in a nursery in the city of G. The experimental group received an 12 weeks psychomotorik. The out come variables were measured before and after the program. Collected data were analyzed by Fisher's exact test, t-test, $X^2$. test, repeated measures ANOVA & ANCOVA using the SPSS 15.0 program. Result: After psychomotorik program, self concept, sociability were increased and aggression decreased in the experimental group. Conclusion: Psychomotorik program was effective in increasing self concept and sociability and decreasing aggression. The program should be effective in psychological development of preshoolers.

• Korean Journal of Occupational Health Nursing
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• v.16 no.2
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• pp.188-196
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• 2007

Purpose: The objective of this study was to evaluate long-term care needs using RAI MDS-HC and MI-CHOICE among the disabled workers. Methods: Data were obtained from 45 personal care recipients with the disability of mental and nervous system, and analyzed using SAS 9.1 by applying t-test, ${\chi}^2$ test, or fisher's exact test. Results: Only 'bed mobility' and 'indoor ambulation' items of ADL and problem activity were statistically significant factors by the level of personal care benefit. By MICHOICE grouping, 20.0 percent of subjects belonged to nursing home group, 51.5 percent were home care service, 28.9 percent were intermittent personal care. Conclusion: Personal care services in industrial accident compensation insurance have been categorized with two groups according to level of disability. But our results could contribute to provide personal care service according to the long term care needs.