• Journal of Korean Society for Quality Management
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• v.25 no.3
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• pp.96-107
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• 1997

The recent stream to reliability prediction is that it is totally inclusive in depth to consider even the operating and environmental condition at the level of finished goods as well as component itselves. In this study, firstly we present the reliability prediction methods by entire failure rate model which failure rate at the system level is added to the failure rate model at the component level. Secondly we build up the improved bases of reliability demonstration through a, pp.ication of Kaplan-Meier, Cumulative hazard, Johnson's methods as non-parametric and Maximum Likelihood Estimator under exponential & Weibull distribution as parametric. And also present the methods of curve fitting to piecewise failure rate under Weibull distribution, PRST (Probability Ratio Sequential Test), curve fitting to S-shaped reliability growth curve, computer programs of each methods. Lastly we show the practical for determination of optimal burn-in time as a method of reliability enhancement, and also verify the practical usefulness of the above study through the a, pp.ication of failure and test data during 1 year.

• Journal of Korean Biological Nursing Science
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• v.12 no.1
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• pp.8-15
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• 2010

Purpose: The purpose of this study is to investigate the effects of relaxation on stress and blood pressure of the college students induced by a cognitive distress game. Methods: The subjects for this research were 18 individuals whose stress index scores were below 4.0 (Asan city). The 18 subjects were divided into two, 9 students were assigned to the experimental group and the other 9 students to the control group randomly. Survey was used to gather data to recognize general characteristics and the level of stress and blood pressure were measured before and after cognitive distress game and relaxation. The gathered data were analyzed with frequency, $X^2$-test, Wilcoxon signed ranks test and Mann Whitney U test using SPSS 14.0 program. Results: Both level of stress and blood pressure displayed a statistically significant difference pre and post cognitive distress game. Relaxation had a statistically significant effect on level of stress. Relaxation, however, did not have statistically significant effect on blood pressure. Conclusion: The above results suggest that while relaxation was effective in reducing level of stress for college students, and therefore recommendable as a means to deal with stress. However, to investigate the effects on physiological index such as blood pressure, further research is needed.

• Journal of the Korean Home Economics Association
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• v.35 no.2
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• pp.1-17
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• 1997

The purpose of this study is to identify the level of children's consciousness and behavior for the environmental conservation, so that provides some fundamental information for the overcome of environmental crisis and reinforces a consumer education for the childrens at home. The subjects were randomly selected form the 4th, 5th, and 6th grade of elementary school students, in April, 1996, Seoul, Korea. The 1342 data obtained were analyzed by Mean, t-test, ANOVA, duncan's Multiple Rang Test, Pearson correlation, and Regression. The major findings were as follows: 1) The average level of children's consciousness for the environmental conservation was relatively low, which was 1.79. There were significantly differences on the children's consciousness for the environmental conservation, according to student's grade level, housing type, parent's education, household income, and the level of consumer socialization. 2) The average level of children's behavior for the environmental conservation was low, which was 2.36. There significant differences on children's behavior of environmental conservation, according to student's sex, grade level, housing type, parent's education and occupation, household income, and consumer socialization. 3) There were significant relationships between children's consciousness and behavior for the environmental conservation. 4) The most influential variable for children's consciousness and behavior of the environmental conservation was consumer socialization. As we see above, this study concludes that consumer environmental education should be reinforced for the children in the home, so that they involved in the environmental activities and have an early experience.

• Structural Engineering and Mechanics
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• v.23 no.5
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• pp.469-486
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• 2006

The main objective of this study was to investigate the seismic behavior of damaged reinforced concrete frames rehabilitated by introducing cast in place reinforced concrete infills. Four bare and five infilled frames were constructed and tested. Each specimen consisted of two (twin) 1/3-scale, one-bay and two-story reinforced concrete frames. Test specimens were tested under reversed-cyclic lateral loading until considerable damage occurred. RC infills were then introduced to the damaged specimens. One bare specimen was infilled without being subjected to any damage. All infilled frames were then tested under reversed-cyclic lateral loading until failure. While some of the test frames were detailed properly according to the current Turkish seismic code, others were built with the common deficiencies observed in existing residential buildings. The variables investigated were the effects of the damage level and deficiencies in the bare frame on the seismic behavior of the infilled frame. The deficiencies in the frame were; low concrete strength, inadequate confinement at member ends, 90 degree hooks in column and beam ties and inadequate length of lapped splices in column longitudinal bars made above the floor levels. Test results revealed that both the lateral strength and lateral stiffness increased significantly with the introduction of reinforced concrete infills even when the frame had the deficiencies mentioned above. The deficiency which affected the behavior of infilled frames most adversely was the presence of lap splices in column longitudinal reinforcement.

• Journal of Korean Academic Society of Home Health Care Nursing
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• v.2
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• pp.60-76
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• 1995

The purpose of this study was to analysis level on family caregiver's burden for the elderly with senile dementia in a rural area and to choose priority care group, thereby facilitating the development of interventions to reduce the caregiver's burden. For this purpose, data were collected by questionaire from June 10 to October 8, 1994. The instruments for data collection were Caregiver Burden Inventory by Novak(1989) and Zarit et al(1982), severity of dementia by Hughes Scales (1982), ADL by Lawton (1971), patients' family caregiving activity by pre-survey and reference review(Lee, 1993 ; Jang, 1990 ; Yoo, 1982). The subjects were 60 family caregiver of senile dementia in a rural area. The data was analysed by the use of t-test, ANOVA, correlation and multiple regression. The results were as follows : 1. Total burden was evaluated over average, the mean of family burden was 61.24. 2. Significant variables which were correlated to the family caregiver's burden were the severity of dementia(F=30.52, p<0.001), ADL(F=5.43, p<0.01), PADL(F=6.14, p<0.01), caregiver's health status(F=6.05, p<0.01), a view of patient's prognosis(F=4.08, p<0.05), the number of hours per day spent on caregiving(F=19.64, p<0.001), level of intimacy of caregiver and patients(F=7.16, p<0.001), the frequency of caregiving activity(F=5.31, p<0.01). 3. ADL was the most important predictor to family caregiver burden(R2=0.6611). In addition to this, the severity of dementia, level of intimacy of caregiver and patient, relationship with the patient accounted for 79% of family caregiver burden. 4. The criteria of priority care group were as follows ; the mean of family caregiver burden was above 58, above of moderate ADL, the number of hours per day spent on caregiving above of 8 hours, above of moderate dementia. By the the severity of dementia, number of priority care group, mild dementia was 10(43.4%), moderate dementia 23 (92.0%), sever dementia 12(100.0%).

• Women's Health Nursing
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• v.14 no.1
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• pp.5-11
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• 2008

Purpose: The purpose of this study was to understand spousal support, demand for health education, and quality of life for married female immigrants. Methods: A total of 120 subjects with adequate communication skills participated in this study from March 1, 2006 until January 30, 2007. Participants were female visitors at the Immigrant Consultation Center in "M City", "Y County" and "M County" in South Jeolla Province. The questionnaire used in this study consisted of a total of 42 items. Data were analyzed using SPSS/win 10.2 to describe subjects' characteristics by frequency, and descriptive statistics, and to test group differences by t-test and ANOVA. Results: The highest demand for health education was exercise, and followed by stress management and diet. The level of spousal support for subjects was below average, and the level of quality of life was above the medium. The most difficult thing in their life was the difficulty in language. There was a significant difference in quality of life by level of education, level of life satisfaction, number of childbirths, and age. There was also a significant difference in spousal support by level of life satisfaction. Conclusion: There is a need for a multidimensional strategy to improve the quality of life and spousal support for immigrant females in international marriages.

• Journal of Korean Academy of Fundamentals of Nursing
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• v.1 no.1
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• pp.19-35
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• 1994

To test the effectiveness of the preparatory audiovisual information with videotape, 34 patients with gastric cancer and who have scheduled for subtotal gastrectomy were studied with quasiexperimental research design. The subjects were selected from the 4 general surgical wards of one university hospital in Seoul, and assigned to experimental and control group conveniently. The videotaped information on the preparation and recovery for surgery was showed to the experimental subjects once before having operation. Data on the sleep and the state anxiety level before and after treatment day was collected with VSH sleep scale and STAI. The data was analyzed with t-test to test the effect of preparatory information and the Pearson's correlation to identify the correlation between anxiety and sleep. The results were summerized as follows : 1. After receiving the preparatory information, the level of anxiety of the experimental group was the same level as the initial, whereas that of the control group showed markedly increase. However no significant difference in anxiety between the two groups was found. 2. There was significant difference in sleep score between the experimental and the control group. 3. There was significant negative correlation between the state anxiety score and the sleep score. Based upon the above findings, this study concludes that preparatory information is effective to enhance sleep just prior to the surgery.

• Journal of Korean Elementary Science Education
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• v.20 no.2
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• pp.217-228
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• 2001

The purpose of this study was to investigate the effect of learning cycle model on the changes of electricity conceptions of elementary students. Four classes in forth grade of an elementary school in Busan were selected and two of them were served as experimental group and the others as control group. The experimental group were taught the unit of "Light an electric bulb" in elementary science textbook with teaching model based on teaming cycle and the control group with traditional teaching style. The instruction effects were analyzed through pre and post-test results using questionnaire on the electricity. The results of pre-test showed that there was not a significant difference between experimental group and control group at .05 level, so two groups could be regarded as homogeneous. The mean score of experimental group was significantly higher than that of control group on the post-test at .05 level. And within-group comparison revealed that both groups made improvement on the mean score and that the improvement of each group had significant difference at .05 level. Above results said that the teaching model based on learning cycle, which focuses on hands-on activity and considers each student as an active subject, was more effective than traditional teaching style in improving the formation of scientific conceptions on electricity.ectricity.

• Journal of the Korean School Mathematics Society
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• v.2 no.1
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• pp.133-144
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• 1999

This study aims at identifying the effect of problem posing on the academic achievement in high school mathematics. As subjects of the study, two classes of first grade in high school were selected. One of them was treated with problem posing learning, the other was treated with learning-in-a-body. Each has 40 students and was also divided into two groups(high- level and low-level) according to their learning-level. Two instruments were used for this study. One was the teaching-learning method developed by the researcher. The other was TTCT(Torrance Test of Creative Thinking). The 't-test' was used for this study and the significant level of test was within 5 percent. The results of this study are as follows: 1. The group with problem posing learning showed significantly higher academic achievement(learning-ability) than the one with learning-in-a-body. 2. There was no significant difference in the academic achievement(creativity) between the two groups. But there was significant difference in the creative factors. 3. There was no significant differences in the academic achievement between high-level-groups in each group. 4. There was significant difference in the academic achievement (learning-ability) between low-level groups in each group. And there was significant difference in the creative factors. On the basis of the results above, the following conclusions could be made. The problem posing learning method was more effective in the academic achievement in highschool mathematics than learning-in-a-body. Especially low-level group was more effective than high-level group. These facts implies that it is more effective for a teacher to adopt the problem posing learning considering the students' learning-levels.

• Journal of the Korean Society of Food Culture
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• v.17 no.3
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• pp.260-266
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• 2002

This study was performed to know effect of Yackwa quality when sucrose fatty acid esters(S-570, S-970, S-1570) were added as an emulsifier. In mechanical characteristics, the Yackwa of sucrose fatty acid esters did greatly decrease the hardness, cohesiveness, springiness and gumminess, respectively, and increase the brittleness compared to the Yackwa of non-emulsifier and egg yolk. This tendency showed at the above level of 1.0% S-570, and 0.5% S-970 and S-1570, respectively. In sensory evaluation, the Yackwa of sucrose fatty acid esters increased the softness compared to the Yackwa of non-emulsifiers and egg yolk. There were significantly differences in the preference at 0.5% level of S-970 and 1.5% level of S-1570, respectively compared to other treatments. In conclusion, the 0.5% level of S-970 would be mostly useful level of emulsifier for making Yackwa.