• Transactions of Materials Processing
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• v.29 no.2
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• pp.76-88
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• 2020

The need for advanced high strength steel (AHSS) forming technology is increasing as interest in light weight and safe automobiles increases. Multipoint dieless forming (MDF) is a novel sheet metal forming technology that can create any desired longitudinal and transverse curvature in sheet metal. However, since the springback phenomenon becomes larger with high strength metal such as AHSS, predicting the required MDF to produce the exact desired curvature in two directions is more difficult. In this study, a prediction model using artificial neural network (ANN) was developed to predict the springback that occurs during AHSS forming through MDF. In order to verify the validity of model, a fit test was performed and the results were compared with the conventional regression model. The data required for training was obtained through simulation, then further random sample data was created to verify the prediction performance. The predicted results were compared with the simulation results. As a result of this comparison, it was found that the prediction of our ANN based model was more accurate than regression analysis. If a sufficient amount of data is used in training, the ANN model can play a major role in reducing the forming cost of high-strength steels.

• Journal of Korean Academy of Nursing Administration
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• v.21 no.4
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• pp.354-365
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• 2015

Purpose: The aim of this study was to examine the relationship between job characteristics, organizational culture, job satisfaction and turnover intention, including the direct and indirect effects of the variables on turnover intention. Methods: A questionnaire was completed by a convenience sample of 144 nurses working for two public institutions. Data were analyzed using independent t-test, One-way ANOVA, Pearson correlation, Hierarchical multiple regression and Path analysis with SPSS/WIN 21.0 and AMOS 21.0 programs. Results: The mean score for job satisfaction and turnover intention was similar to that of other hospital nurses. The factors affecting job satisfaction were: position, number of job changes, relationship-oriented culture, and hierarchical-oriented culture(Adj. $R^2=.48$, F=14.43, p<.001). The factors affecting turnover intention were: age, position, overtime, and job satisfaction(Adj. $R^2=.61$, F=19.48, p<.001). Job autonomy and relationship-oriented culture had a significant indirect effect on turnover intention. Conclusion: In developing intervention strategies to improve job satisfaction and reduce turnover intention there is a need to consider both the job characteristics and organizational culture of nurses in public institutions.

• Imaging Science in Dentistry
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• v.41 no.1
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• pp.7-10
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• 2011

Purpose : The purpose of this study was to compare the conventional and digital radiography in the estimation of working length in mandibular molars. Materials and Methods : Sixty molar teeth were selected and divided into three groups in the basis of canal curves (0-$15^{\circ}$, 15-$30^{\circ}$, > $30^{\circ}$). After the placement of a 15 K-file, radiographs were taken with a conventional film (Fspeed) and a digital sensor. Canal lengths were measured in these images by two observers. Statistical analysis was performed with repeated measures of ANOVA and paired sample t-test with 95% confidence. Results : There was a high inter-observer agreement on the measurements of working length in conventional and digital radiographs. There was no significant difference between the mean values of measurements in conventional and digital radiography. Moreover, there was no significant difference between conventional and digital radiography with the actual values in the basis of canal curves. Conclusion : The accuracy of conventional and digital radiography in the determination of the working length was in an acceptable range.

• Journal of the Korean Home Economics Association
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• v.29 no.3
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• pp.1-10
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• 1991

The purpose of the present study was to identify the effects of communicator, type of clothing and subject's age on informational influence in clothing conformity. The sample consisted of 205 subjects assigned to two groups (female college students in their early twenties and housewives in their late thirties living in kyongju). In this study the research design consisted of a 3(communicator)×2(subject's age)×2(type of clothing) factorial design. The stimuli consisted of 10 color photographs (6 one-piece dresses and 4 jeans in current fashion) In the first step, subjects were asked to arrange stimuli in the order of greatest fashionability. In the second step, subjects were exposed to experimental manipulation which consisted of slides of various clothing styles and an essay concerning a forecast on fashion trends. The communicator in the essay was described as a designer, a college student, or a housewife. In the third step, in addition to other questions subjects were asked to indicated their degree of agreement with the essay. The data were analyzed by ANOVA, X2 and t-test. The results were: 1. Informational influence on clothing conformity varied by communicator, type of clothing, and subject's age. Subjects were most conforming when the communicator was described as a designer and when the clothing style was a one-piece dress. 2. Informational influence results revealed that housewives were more conforming than the female college students in the jean style.

• Journal of Korean Biological Nursing Science
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• v.10 no.2
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• pp.121-130
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• 2008

Purpose: This study was undertaken to identify stroke risk with risk factors and knowledge of stork in women with prehypertension. Methods: A total of 46 pre-hypertensive women in urban area aged 44.8 (SD 11.4) yr old in average were selected by a convenient sampling. Demographic data, risk factors, and knowledge of stroke were assessed through face to face interview. Stroke risk scores were calculated based on points given to age, systolic blood pressure, smoking, DM, and heart disease in Framingham stroke risk score. Data were analyzed by SPSS WIN 12.0 using descriptive statistics, two sample t-test, and Pearson's correlation coefficient. Results: The mean systolic blood pressure of participants was 133.11 mmHg, and HDL cholesterol was lower than the recommended level, although rest of physiologic risk factors were within normal. Of the participants, 82% did not do regular physical activity and 75% did not control fat intake persistently. Mean stroke risk points and knowledge scores were 4.48 and 29.15, respectively, which were significantly different between women with and without persistent controlling fat intake. Conclusion: Results indicate stroke prevention intervention for prehypertensive women should address comprehensively modifying lifestyle as well as physiologic factors, and information focusing on stroke risk factors and warning symptoms.

• Journal of Korean Academy of Fundamentals of Nursing
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• v.6 no.3
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• pp.369-381
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• 1999

The purpose of this study was to determine the predictors of health promoting lifestyles(Health Promoting Lifestyle Profile HPLP) of Koreans in the Philippines. The sample consisted of 100 Koreans who have lived in Manila, Philippines. Data were collected for two months from Feb, 1 to March 30, 1998. Analysis of the data was done by use of percentage, t-test, ANOVA, Pearson's Correlation Coefficients, and Stepwise Multiple Regression. The results of this study were summarized as follows : 1. The range of total HPLP score was from 73 to 175 and the mean score of that was 117.23. In comparison of mean scores depending on each item of six dimensions, self-actualization dimension tended to show the hightest score(2.98) and responsibility for health dimension, the lowest score(1.83). 2. The HPLP score showed a positive correlation with age(r=.19), social support (r=.39), self-efficacy(r=.52) and perceived health status(r=.27), but a inverse correlation with perceived health care service utilization barriers(r=-.20). 3. By using stepwise multiple regression analysis it was determined that the main influencing factors on the HPLP score were self-efficacy(27.2%), social support(5.3%), age(5.3%) and perceived health status(2.9%). These variables made it possible to explain 40.7% of variance in HPLP score.

• Korean Journal of Health Education and Promotion
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• v.28 no.5
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• pp.83-95
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• 2011

Objectives: This study was conducted to examine the immunization, knowledge, and preventive health behaviors for hepatitis A in college students. Methods: Structured questionnaire survey data were collected from a convenient sample of 266 students at two universities in urban areas. Data were analyzed with Pearson correlation coefficient, t-test, ANOVA, and multiple logistic regression analysis. Results: Only 10.5 percent of the students reported having had hepatitis A vaccination. The levels of knowledge and compliance of preventive health behavior were moderate with the mean scores of 15.56(${\pm}2.12$), and 26.78(${\pm}3.41$), respectively. A significant correlation was found between knowledge and preventive health behaviors. The compliance to preventive health behaviors differed by education on hepatitis A in the past. Conclusions: Vaccination rate of hepatitis A found to be low and the knowledge and health behaviors for hepatitis A prevention among university students are limited. Provision of vaccination, education and strategies to enhance preventive health behaviors are warranted to prevent hepatitis A.

• Child Health Nursing Research
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• v.11 no.1
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• pp.34-42
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• 2005

Purposes: The purposes of this study were ① to identify the rate of suicide attempts, and ② to investigate relevant variables(family dynamic environment, personality factors) and risk factors for attempting suicide among Korean adolescents. Method: Data were collected through a questionnaire survey. Internal consistencies for this questionnaire ranged from 0.63 to 0.88. Nine hundred and twenty two adolescents were surveyed (delinquent : 367, student : 555), using a proportional stratified random sampling method. Statistical methods employed were chi-square, t-test, and logistic regression analysis. Results: ① The rate of suicide attempts was 10.8％ for the total sample, and the delinquents(19.6％) had a higher rate of suicide attempts than the students(5.1％). ② Adolescents attempting suicide had a greater dysfunctional family dynamic environment and more maladaptive personality than those who did not attempt suicide. ③ Risk factors for suicide attempts among Korean adolescents were way of coping, psychosomatic symptoms, and parental child-rearing attitudes, in that order. Conclusions: Suicide and suicidal behaviors are multifaceted events. For suicide prevention, there is a need to make an independent assessment of the variables such as familial problems, personality and dynamic environment of the families of the adolescents.

• The Journal of Korean Academic Society of Nursing Education
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• v.16 no.1
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• pp.14-23
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• 2010

Purpose: The purpose of this study was to investigate the relationship among stress, depression, coping styles and satisfaction of clinical practice in nursing students. Method: Two hundred fifty-eight nursing college students in 1 city were selected by convenient sample. A questionnaire measured the level of stress, depression, coping styles and satisfaction of clinical practice. The data were analyzed using descriptive statistics, t-test, ANOVA, and Pearson's correlation coefficient. Result: The mean score of stress was 2.82 (${\pm}.39$), depression was 19.23 (${\pm}7.70$), coping styles was 2.42 (${\pm}.42$), and satisfaction of clinical practice was 2.81 (${\pm}.41$). There were significant differences on four variables according to the satisfaction of a nursing major. Stress had a significant positive correlation with depression, and a negative correlation with problem focused coping and satisfaction of clinical practice. Depression had a significant negative correlation with satisfaction of clinical practice. Emotional focused coping had a significant positive correlation with depression, and problem focused coping had a significant negative correlation with depression. Conclusion: From the studies reviewed, one can expect a positive effect on decreasing stress and depression among nursing students when the nursing educators use counseling and instruction for clinical practice.

• Korean Journal of Adult Nursing
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• v.22 no.4
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• pp.438-447
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• 2010

Purpose: The study examined factors related to the meaning in life in elderly in one city. Methods: The sample consisted of 217 subjects all of which were over 60 years of age and were recruited from two community senior centers from December 2008 to February 2009. Data collection instruments were the Meaning in Life Scale, Social Support Index, CES-D, and RULS questionnaire. SPSS/WIN 17.0 was used for descriptive analysis, independent t-test, one-way ANOVA, and correlation coefficient. Results: The mean of the score from the Meaning in Life was 50.04 (range 10~70). There were significant differences in subjects' perception of meaning in life according to age, level of education, religion, having a spouse, satisfaction with relationship with children, and frequency of visits to a community senior center. Meaning in life was significantly correlated with family support, depression, and loneliness, which were significant predictors (21.5%) of meaning in life. Conclusion: To improve meaning in life of the elderly who visited a community senior center, nurses may pay attention to depression, loneliness, and family support.