• Fisheries and Aquatic Sciences
• /
• v.2 no.1
• /
• pp.8-11
• /
• 1999

The optimum boiling condition was determined for fish extracts by response surface model. Model equations were designed with effect of time (T) and the amount of added water (W) on the level of released free amino acid. Based on the high (>0.9) coefficient of determination and low (<0.01) level of significant, those model was approved to be significant. The added water amount of higher regression coefficient $ (\beta_2)$, showed a greater influence on releasing free amino acids than boiling time. The optimum boiling times are 6 hours for crucian carp, 5 hours for bastard halibut, 7 hours for loach and 5 hours for jacopever. The ratio of added water to sample 1 (v/w) could be applied to all fish samples at $100\pm2^{\circ}C$.

• Communications for Statistical Applications and Methods
• /
• v.11 no.1
• /
• pp.161-168
• /
• 2004

A single-index model is useful in fields which employ multidimensional regression models. Many methods have been developed in parametric and nonparametric approaches. In this paper, posterior inference is considered and a wavelet series is thought of as a function approximated to a true function in the single-index model. The posterior inference needs a prior distribution for each parameter estimated. A prior distribution of each coefficient of the wavelet series is proposed as a hierarchical distribution. A direction $\beta$ is assumed with a unit vector and affects estimate of the true function. Because of the constraint of the direction, a transformation, a spherical polar coordinate $\theta$, of the direction is required. Since the posterior distribution of the direction is unknown, we apply a Metropolis-Hastings algorithm to generate random samples of the direction. Through a Monte Carlo simulation we investigate estimates of the true function and the direction.

• Journal of Preventive Medicine and Public Health
• /
• v.37 no.2
• /
• pp.111-119
• /
• 2004

Purpose : To identify those factors influencing the post-operative satisfaction in myopia patients receiving laser in situ keratomileusis (LASIK) Methods : This study included 288 consecutive patients who received LASIK between July and December 2001 from two eye clinics located in Seoul and Pusan. Factors that were considered to influence post-operative satisfaction included pre-operative baseline characteristics, pre-operative expectation for treatment outcomes, and treatment outcomes. Before undergoing LASIK, study subjects were asked to rate the degree of their expectation for the improvement of visual functions and symptoms after LASIK on a 5-point Likert-type scale: where 1 referred to 'somewhat worse,' 2 to 'no change,' 3 to 'somewhat improved,' 4 to 'improved,' and 5 to 'very improved.' Self-administered questionnaire was used to evaluate baseline visual functions and symptoms on a 5-point scale before LASIK. At 6 months after LASIK, the evaluation was repeated to measure treatment outcomes in terms of the difference in the score before and after LASIK. Post-operative satisfaction was also measured at 6 months on a 5-point scale. Multiple regression analysis was performed to examine the independent relationship between influencing factors and postoperative satisfaction. Results : A total of 171 patients (59.4%) participated in the 6-month follow-up investigation. The average expectation scores for the improvement in visual functions and symptoms were 3.8 and 3.4, respectively. The average score for the 7 questions assessing satisfaction was 4.0. The results of the regression analysis showed that the post-operative satisfaction increased with improvement in the visual function ($\beta$=0.16, p<0.05) and symptoms ($\beta$=0.25, p<0.05), the degree of preoperative refractive error ($\beta$ =0.26-0.67, p<0.05) and in male patients ($\beta$=0.31, p<0.1). The pre-operative expectation was not a statistically significant factor in explaining postoperative satisfaction in the regression model. Conclusion : The finding from this study was that patients with very severe myopia tended to be more satisfied with the treatment than those with mild myopia, which implies that LASIK can be more beneficial to those suffering from a severe visual condition. Patient satisfaction was also significantly affected by the treatment outcomes experienced after LASIK. This suggests that improving the clinical outcome is the most fundamental requirement for the improvement of patient satisfaction.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.18 no.10
• /
• pp.432-441
• /
• 2017

The aim of this study was to investigate the relationship among family function, intimacy risk with the opposite sex, and campus life satisfaction among college students. A descriptive study was conducted. Data were collected from May 11, 2017 to May 20, 2017 by using a structured questionnaire. The participants were 180 college students at two colleges in J-city. Data were analyzed using t-test, one way ANOVA, Scheffe test, pearson correlation coefficient, and multiple regression analysis with SPSS 20.0. The mean scores were as follows: family function $3.07{\pm}0.44$(5 points), intimacy risk with the opposite sex $2.03{\pm}0.59$(4 points), and campus life satisfaction $3.20{\pm}0.50$(5 points). There was a significant correlation between the family function, intimacy risk with the opposite sex, and campus life satisfaction variables. Multiple regression analysis showed that factors influencing campus life satisfaction were family communication(${\beta}=0.341$, p=.001) and parental economic activity type(${\beta}=0.161$, p=.007). The explanation power of this regression model was 13.1%. These results of this study indicate that effective campus life satisfaction should be developed by including improvement of family community of family function.

• The Journal of the Korea Contents Association
• /
• v.18 no.8
• /
• pp.646-657
• /
• 2018

Purpose: This study is to investigate factors affecting depression in nursing students. Methods: A survey was conducted with 216 nursing students in college at P city, D city, and K province. Data was collected from April 15 to May 21, 2018, and analyzed by descriptive statistics, t-test, one-way ANOVA and hierarchical regression with IBM SPSS Statistics 24.0. Results: There was a significant positive correlation between verbal violence and depression(r=.261, p<.001), between physical threat and depression(r=.291, p<.001). Also, Self-esteem had a significant positive correlation with resilience(r=.685, p<.001) and negative correlation with depression(r=-.590, p<.001). Moreover, resilience had a significant negative correlation with depression(r=-.612, p<.001). In the hierarchical analysis, factors affecting the nursing students' depression were resilience(${\beta}=-.337$, p<.001), self-esteem(${\beta}=-.279$, p<.001), physical threat(${\beta}=.177$, p=.001). The variable that had the highest impact on depression was resilience and the explanatory power of the regression model was 51.5%(F=17.965, p<.001). Conclusion: The findings of this study indicate that the major factors influencing nursing students depression are physical threat, self-esteem and resilience. Therefore, it suggests that an intervention program will be required to prevent violence during the clinical practice, enhances self-esteem and improves resilience in order to reduce depression of nursing students.

• Journal of Digital Convergence
• /
• v.14 no.6
• /
• pp.295-307
• /
• 2016

The purpose of this study was to explore the influence of credibility of health information (CHI) source and e health literacy (eHL) on health information orientation (HIO) of parents of hospitalized children. Convenience sampling method of 109 parent whose children were admitted in a children's hospital in D city was used. The hierarchial regression model with general characteristics and characteristics of children for step 1 and eHL and CHI for step 2 against HIO was statistically significant (F=8.22, p<.001). And this model could explain 40% of HIO ($R^2$=.40). Especially, eHL (${\beta}$=.54, p<.001) and CHI (${\beta}$=.21, p=.008), subjective health perception (${\beta}$=.19, p=.016), and age (${\beta}$=-0.15, p=.048) were identified the influencing factors on HIO. Based on these findings, to foster the HIO of parents of inpatient children, credible health information should be given to these population and a approach with eHL enhancement should be considered. And further research that is to explore the way to enhance the eHL should be carried out to suggest the practical application

• The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
• /
• v.25 no.4
• /
• pp.45-56
• /
• 2012

Objective : This study was done to investigate the correlation between general quality of life(QOL) and disease specific QOL of tinnitus patients. Methods : 2009 National health and nutrition survey(NHNS) data were employed for analyzing the mean estimates of total population and tinnitus sub-group patients, and predicting the regression equation of mapping between EQ-5D and disease severity. Baseline statistical analyses and normality tests were done by using Student t-test, Chi-square test, Shapiro-Wilk test and ladder test. Hierarchial regression analyses were performed using related variables and predicted the optimal regression equations. Statistical significance was achieved if the probability was less than 5%. Results : Firstly, the standardized prevalence of tinnitus patient in South Korea was 18.69% and over 90th age-group was relatively higher than other groups. Mean value of domestic QOL measured by EQ-5D was estimated as 0.9486 and QOL of tinnitus subgroup(0.9169) was lower than the non-tinnitus subgroup(0.9559), significantly. Stratified by age and sex, QOLs of all sub-groups with tinnitus were lower than without tinnitus sub-groups significantly. Regression equations from 2009 NHNS data were developed using hierarchial regression analysis which is as follows. $$Y_{EQ-5D}=0.9224-0.0079{\times}T1-0.0261{\times}T2-0.0951{\times}T3+\sum_{i=1}^{n}{\beta}_i{\times}X_i\\{\hspace{95}}(0.0106){\hspace{3}}(0.0037){\hspace{30}}(0.0072){\hspace{30}}(0.0038)$$ ($X_i$=Other explanatory variables except Tinnitus QOL1, 2, 3, ${\beta}$= Regression Coefficient of Model 4) Conclusion : We confirmed the correlation among THI and EQ-5D and HUI-III, and developed the inference for regression equation of EQ-5D.

• Research in Community and Public Health Nursing
• /
• v.24 no.4
• /
• pp.471-479
• /
• 2013

Purpose: This study was conducted to identify factors for smoking middle school students' intention to quit smoking on the basis of the social influence and self-efficacy [ASE] model. Methods: Data were collected from 2,015 students from five middle schools in Daegu with a structured questionnaire in March, 2013 and analyzed by using $x^2$-test, ANOVA, pearson's correlation and multiple regression analysis. Results: The smoking rate was 6.1% among the total subjects and 85.4% of the smokers had intention to quit smoking. The mean value of attitude toward quitting smoking was $2.15{\pm}0.34$, that of social influence $3.38{\pm}0.65$, and that of self-efficacy $2.84{\pm}0.95$. The multiple regression analysis showed an explanatory power of 24.7%, and experience of trying to quit smoking was the strongest factor affecting the intention to quit smoking (${\beta}$=.34, p<.01), followed by school years and social influence. Conclusion: In order to increase smoking middle school students' intention to quit smoking, intervention strategies are needed to increase positive social influence or to offer public information to younger smoking students in low school years.

• Journal of agricultural medicine and community health
• /
• v.41 no.1
• /
• pp.13-26
• /
• 2016

Purpose: This study was performed to identify the association between family support, activities of daily living (ADL) and depression among hospitalized older patients with chronic diseases. Methods: This study subjects were 100 elderly patients with chronic diseases including chronic respiratory diseases, diabetes mellitus and et al. in a general hospital. The collected data were patient characteristics, family support, ADL, and depression by structured questionnaire and medical chart review. The used statistical analyses were t-test, analysis of variance, Pearson's correlational analysis and multiple regression analysis. Results: The mean scores of family support, ADL and depression were $49.95{\pm}8.68$, $8.65{\pm}2.65$, $6.66{\pm}3.78$, respectively. The prevalence rate of depression was 64.0%. In simple analysis, the statistically significant associated factors with depression were age, spouse, economic status, social activity, subjective health status, and number of pain. Depression had statistically a significant positive correlation with ADL and a negative correlation with family support. The final result of hierarchial multiple regression analysis (Model 3), the factors related to depression were family support (b=-.135, p<.001), subjective health status (b=2.510, p=.001). Conclusions: It is necessary to develop and apply the program for controlling the depression of elderly patients with health education, reinforcement of supportive systems in hospital. And, further multidisciplinary studies should be done.

• 전자공학회논문지 IE
• /
• v.49 no.1
• /
• pp.30-38
• /
• 2012

The participants were 102 students with digital broadcasting and media major.. A hypothetical model proposed included learning flow, school support as predictors, and satisfaction and learning persistence as a criterion. The results of this study through multiple regression analysis indicated that learning flow and school flow predicted significantly on satisfaction. And school flow, school support, and satisfaction predicted significantly on learning persistence. In addition, satisfaction mediated between learning flow and learning persistence, and between school flow and learning persistence. A constructive foundation for providing learning strategies in the successful engineering education would be proposed on the basis of the current results of this study.