• Women's Health Nursing
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• v.7 no.3
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• pp.317-330
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• 2001

This study was undertaken in order to examine the relationship of control, perceived health status, self efficacy, social support, and demographic characteristics to health promoting lifestyle of nursing students, and to determine factors affecting health promoting lifestyle of nursing students. The subjects were 270 students of a single university in Busan. The instruments used for this study was a survey of general characteristics, health promoting lifestyle (47 items), control(8 items), perceived health status(6 items), self-efficacy(17 items), and social support(18 items). Data analysis was done by use of mean, percentage, t-test, ANOVA, Pearson Correlation coefficients and stepwise regression with a SPSS PC+ program. The results of this study are as follows : 1) The average item score for the health promoting lifestyle was less than 2.43. In the sub-categories, the highest degree of performance was interpersonal relationships (2.94) and the lowest degree was health responsibility(1.93). 2) Students who were older and higher scores in health responsibility and interpersonal support subscale. Students who had higher grade had higher scores in health support subscale. Students who had experienced disease had higher scores in health responsibility subscale. Students who had experienced exercise had higher scores in health responsibility, exercise and nutrition subscale. 3) Significant correlation between control and self-efficacy, self-efficacy and social support was found. 4) Significant correlations was found between most of the subscales and total health promoting lifestyle. 5) Social support revealed significant correlations with total health promoting lifestyle and all subscales of health promoting lifestyle. Control revealed significant correlations with total health promoting lifestyle and self actualization and health responsibility. Perceived health status revealed significant correlations only with the exercise and nutrition subscale. Self-efficacy revealed significant correlation with the total health promoting lifestyle and all subscales of health promoting lifestyle except exercise and nutrition, stress management subscale. 6) Social support was the highest factor predicting health promoting lifestyles of nursing students(31%). Social support, excercise self-efficacy and control accounted for 35% in health promoting lifestyle of nursing students.

• Structural Engineering and Mechanics
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• v.74 no.2
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• pp.157-173
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• 2020

In the finite element modelling of long-span cable-stayed bridges, there are a lot of uncertainties brought about by the complex structural configuration, material behaviour, boundary conditions, structural connections, etc. In order to reduce the discrepancies between the theoretical finite element model and the actual static and dynamic behaviour, updating is indispensable after establishment of the finite element model to provide a reliable baseline version for further analysis. Traditional sensitivity-based updating methods cannot support updating based on static and dynamic measurement data at the same time. The finite element model is required in every optimization iteration which limits the efficiency greatly. A convenient but accurate Kriging surrogate model for updating of the finite element model of cable-stayed bridge is proposed. First, a simple cable-stayed bridge is used to verify the method and the updating results of Kriging model are compared with those using the response surface model. Results show that Kriging model has higher accuracy than the response surface model. Then the method is utilized to update the model of a long-span cable-stayed bridge in Hong Kong. The natural frequencies are extracted using various methods from the ambient data collected by the Wind and Structural Health Monitoring System installed on the bridge. The maximum deflection records at two specific locations in the load test form the updating objective function. Finally, the fatigue lives of the structure at two cross sections are calculated with the finite element models before and after updating considering the mean stress effect. Results are compared with those calculated from the strain gauge data for verification.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.16 no.6
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• pp.117-124
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• 2017

In this study, we investigated the optimization of process conditions by using the Six Sigma process, design of experiment (DOE) method and response surface method (RSM) to resolve dimensional deviation and appearance problems arising from the shortened process time of the mobile phone rear cover. The analysis of the trivial many was performed by 2-sample T-test and cooling time, and mold temperature and packing pressure were selected as the vital fews affecting the overall width of the product. The optimal conditions of the process were then studied using the DOE and the RSM. We analyzed the improvement effects by applying the selected optimal conditions to the production process and the results showed that the difference between the mean value and target value of the overall width stood at 0.01 mm, an improvement of 88.89% compared to current process that fell within the range of standard dimension. The short-term process capability stood at $4.77{\sigma}$, which implied an excellent technology level despite a decrease by $0.22{\sigma}$ compared to the current process. The difference in process capability decreased by $2.44{\sigma}$ to $0.41{\sigma}$, showing a significant improvement in management capability. Ultimately, the process time of the product was shortened from 18.3 seconds in the current process to 13.65 seconds, resulting in a 34.07% improvement in production yield.

• Clinical and Experimental Reproductive Medicine
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• v.26 no.3
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• pp.369-375
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• 1999

Objective: To evaluate the effect of serum obtained before and after treatment for endometriosis on in vitro fertilization and development of two cell mouse embryo. Design: Pretreatment and posttreatment comparoson of fertilization of mouse oocyte and embryo development in serum supplement from patients with endometriosis; result were compared using Stuent T-test analysis. Method: Infertility Clinic, Department of Obstetrics and Gynecology, Collage of Medicine, Won kwang university, Korea. Patients was chosed eleven consecutive women with endometriosis. Interventions was all patient underwent laparoscopic or conservative surgery. This was followed by a 6-month course of burserelin acetate $900{\mu}g/d$. Main outcome was measured total number of fertilization and embryo that was fertilization after 24 hours and reached blastocyst stage after 72 hours of incubation were compared before and after treatment. Result: Before treatment, 47% of the oocyte were fertilized and 31% of the embryo reached blastocyst stage. After treatment, Significantly more fertilized and Significantly more embryo developed to blastocyst on the stage I and II of endometriosis. Conclusion: The fertilization and embryo toxicity of serum samples from patients with endometriosis is lost after treatment.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.30 no.3 s.47
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• pp.385-388
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• 2004

Recently, along with the remarkable increase in interest in natural products, the application of phytoestrogens in anti-aging products has become very important. In the focus, we developed Pueraria mirifica (PM), in this in vivo study on skin elasticity and wrinkles, and investigated the anti-aging properties. Thirty healthy women volunteers, between the ages of 30 and 60, applied the cream formula with $4\% Pueraria mirifica or placebo, on the face area twice a day for 16 weeks. The evaluation was made by silicon replica analysis, Cutometer SEM 575 and Comeometer followed by statistical treatment using the student's t-test. Results of skin elasticity measurement showed that topical application on the skin increased the total surface of skin elasticity in comparison with placebo group (p<0.05). However, PM cream does not have prominent effect on the depth of wrinkles and skin moisturization. This in vivo study demonstrates that, PM exhibits a significant effect on skin elasticity therefore, is of great interest in anti-aging and firmness skin care products.

• Journal of Sasang Constitutional Medicine
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• v.23 no.2
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• pp.240-253
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• 2011

1. Objectives: The purpose of this study was to survey the Original symptoms(素證) of Soyangin's and to compare the tendency of their symptoms between Soyangin Heat-related diarrhea accompanied by headache(身熱頭痛亡陰證) and Soyangin Cold-related diarrhea accompanied by abdominal pain(身寒腹痛亡陰證). 2. Methods: We recruited 56 Soyangin subjects in the Korean Medicine clinic and researched their original symptoms. Subjects were diagnosed by the Sasang Constitutional specialists and Sasang Constitutional Medication. Subjects were two groups, confirmed to Soyangin Heat-related diarrhea accompanied by headache and Soyangin Cold-related diarrhea accompanied by abdominal pain. All subjects answered the questionnaire about their Original symptoms. We found the differences between 2 groups using the Independent-Samples T-test. Analysis was conducted using SPSS 12.0 for Korean. 3. Results and Conclusions: In Original symptoms, Tendency of overeating(p=0.01), Condition of digestion(p=0.04), Perspiration after exercise (p=0.02), Usual perspiration(p=0.00), Tiredness after perspiration(p=0.05) Cold intolerance on extremities(p=0.04), General edema(p=0.01) etc. are different between 2 groups. We found the differences of heat and cold in symptoms between two Soyangin syndromes.

• Journal of the Ergonomics Society of Korea
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• v.34 no.1
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• pp.11-18
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• 2015

Objective: The aim of this study was to understand the effects of phone weight on the typing performance and muscle recruitment in the neck and upper extremity while typing a text message with dominant hand. The iPhone4 and iPhone5 were compared due to their 28-gram differences in weight. Background: Too much use of a cellular phone can lead the musculoskeletal disorders in the upper extremity. Phone makers tend to make their new models bigger, lighter, faster and smarter. Method: Fourteen healthy volunteers without any history of neuromuscular disorders or ongoing pain who used their smartphone more than one year were recruited. A 112g phone (iPhone5) and a 142g phone (iPhone4) were used for typing the lyric of the Korean national anthem with their dominant hand. Typing duration, the typing error, the perceived fatigue, and preference was investigated. Muscle recruitment and the resting gap of neck (middle trapezius and levator scapula), shoulder (infraspinatus and mid deltoid), elbow (biceps brachii and brachioradialis), thumb (extensor and abductor policis brevis) were collected using surface electromyography. Typing error was counted and typing speed was calculated in characters per min. The data were analyzed using a paired t-test and chi-square (${\chi}^2$) analysis for the effects of phone weight on the typing performance parameters and muscle recruitment. Results: Typing text message with iPhone5 took longer but had less muscle recruitment in brachioradialis, and extensor policis brevis muscles. Lighter weight of iPhone5 made biceps brachii to rest less without increasing the mean %EMG. Conclusion/Application: Findings of this study can be valuable information for phone designers to develop more productive device and for smartphone users to prevent the musculoskeletal disorders in the upper extremities.

• Korean Journal of Hospice Care
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• v.5 no.1
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• pp.1-13
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• 2005

Purpose:The purpose of this study was to find the ways to improve a quality of life of cancer patients through the family support by analyzing the correlation between quality of life and family support that cancer patients perceived. Methods: The questionnaires for this study were collected from 43 cancer patients who were admitted in general hospitals at Gyounggido from July 2004 to August 2004. The questionnaire was composed of total 60 items, which were general characteristics of 18 items, family support of 11 items and quality of life of 31 items. Kang's(1984) scale of family support and Tae's(2000) scale of quality of life were used. The data were analyzed with SPSS WIN 10.0 program using frequency, mean±SD, t-test, ANOVA and Pearson's correlation analysis. Results: Forty three cancer patients answered the questionnaire. Twenty three patients was a male and 20 a female. Mean scale of family support according to general characteristics was 3.87±0.71. Mean scale of quality of life according to general characteristics was 5.89±1.08 and relatively high. The better degree of education, the higher quality of life significantly and the less physical discomfort, the higher quality of life significantly. The quality of life when the patient burdens the spouse with treatment cost was significantly higher. A correlation between degree of family support and quality of life was r=0.488 and the higher family support that cancer patients perceived, the higher quality of life significantly(p<0.001). Conclusion: The higher family support that cancer patients perceived, the higer quality of life significantly. We suggest concrete and systemic program for family support.

• Maxillofacial Plastic and Reconstructive Surgery
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• v.39
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• pp.21.1-21.6
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• 2017

Background: The purposes of the present study were to compare implant stabilities of mandibular block bone graft and bovine bone graft and to evaluate influencing factors for implant stability in mandibular block bone (MBB) graft. Methods: This retrospective study investigated 1224 cases and 389 patients treated by one surgeon in the Department of Oral and Maxillofacial Surgery of Pusan National University Dental Hospital (Yangsan, Korea) between January 2010 and December 2014. Proportions that MBB graft cases constitute in all implant restoration cases and in all bone graft cases were measured. Implant stability quotient (ISQ) values were achieved by the same surgeon before loading. The average ISQ values of the experimental groups were compared. In addition, ISQ values of influencing factors, such as age, sex, implant size, and implant placement site, were compared within the MBB group using $Osstell^{TM}$ Mentor ($Osstell^{(R)}$, $G{\ddot{o}}teborg$, Sweden). Paired t test and ANOVA were conducted for statistical analysis with a significance level of 0.05. Results: Fifty-five percent of all implant restoration cases performed bone graft while MBB cases constituted 34% of all implant restoration cases and 61% of all bone graft cases. Comparing ISQ values according to bone graft materials, the MBB group manifested sufficient implant stability by presenting comparable ISQ value to that of the experimental group without bone graft. Among the reviewed factors, females, mandibular molar regions, and implants in larger diameter displayed greater implant stabilities. Conclusions: Satisfactory implant stability was accomplished upon administration of MBB graft. Within the limitation of this study, gender, implant site, and implant diameter were speculated to influence on implant stability in MBB graft.

• Journal of Korean Academy of Nursing Administration
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• v.12 no.2
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• pp.311-322
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• 2006

Purpose: The objective of this literature review study was to identify patterns and trends of studies on leadership among nurse managers in nursing organization and suggest the direction of future researches. Methods: Research Studies on the leadership were selected from thesis and related journals, which had been conducted from 1975 to 2006.5. Search Terminologies were used "leadership". The Total number of the collected studies were 69. Results: The number of studies on leadership has been increased rapidly since 1990's. In research design, Quantitative studies were 68 except for a Qualitative study. Correlation research were 45(65.2%) among quantitative studies. Conceptual frameworks, research questions and hypotheses were involved 31.9%, 98.6%, 31.9%. In subject, General nurse is 46.4%, Head nurse and General nurse was 23.2% and Head nurse is 2.9%. All the studies used questionnaire in data collection method. Measurement tools were used 50% for Bass' MLQ(MLQ-5X). For the statistical analysis, Correlation, ANOVA, t-test were used for 20.3%, 17.4%, 10.5% respectively. The number of leadership related variables were work-related, organization-related, personal recognition or attitude, empowerment, personality. The sub-variables were used for 31 Job satisfaction. Further studies were suggested the develop of leadership program, measurement for the effect of leadership, repeated studies on leadership, the development of measurement about leadership. Conclusion: These results will be used to provide the basic data for developing leadership theory on nursing organization.