• Journal of Microbiology and Biotechnology
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• v.30 no.1
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• pp.136-145
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• 2020

Chlorella sp. HS2, which previously showed excellent performance in phototrophic cultivation and has tolerance for wide ranges of salinity, pH, and temperature, was cultivated heterotrophically. However, this conventional medium has been newly optimized based on a composition analysis using elemental analysis and ICP-OES. In addition, in order to maintain a favorable dissolved oxygen level, stepwise elevation of revolutions per minute was adopted. These optimizations led to 40 and 13% increases in the biomass and lipid productivity, respectively (7.0 and 2.25 g l^-1d^-1 each). To increase the lipid content even further, 12 h heat shock at 50℃ was applied and this enhanced the biomass and lipid productivity up to 4 and 17% respectively (7.3 and 2.64 g l^-1d^-1, each) relative to the optimized conditions above, and the values were 17 and 14% higher than ordinary lipid-accumulating N-limitation (6.2 and 2.31 g l^-1d^-1). On this basis, heat shock was successfully adopted in novel Chlorella sp. HS2 cultivation as a lipid inducer for the first time. Considering its fast and cost-effective characteristics, heat shock will enhance the overall microalgal biofuel production process.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.6
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• pp.3789-3798
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• 2014

This study examined the factors affecting blood donation intention and behavior in college students based on the theory of planned behavior. The subjects were 258 students from one college in G city, and the data was collected by a survey using self-administered questionnaires structured from June 3 to June 14, 2013. The data was analyzed using the SPSS 19.0 program, the variables affecting the blood donation intention were analyzed by stepwise multiple regression, and the variables affecting the blood donation behavior were analyzed by Logistic regression. The factors affecting the blood donation intention were in order the perceived behavioral control, attitude toward the behavior and subjective norm, and the explanatory power was 65.6%. In addition, the factor affecting the blood donation behavior was only the blood donation intention (OR=1.129, p=.010) except for perceived behavioral control. Therefore, the perceived behavioral control, attitude and subjective norm should be considered when developing blood donation programs for college students.

• Journal of Nutrition and Health
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• v.37 no.2
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• pp.132-142
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• 2004

Nutritional factors affecting bone mineral density (BMD) in the different age groups of Korean men were investigated to obtain baseline data for maintaining bone health. Information on diet and anthropometry was collected in 80 elementary school children, 83 high school students, 87 adults aged 25 to 35 years and 98 elderly people over 60 years of age. Data for food and nutrient intake were obtained by 24-hour recall method. BMDs of lumbar spine (L$_2$- L$_4$) and femoral neck were measured by dual energy x-ray absorptiometry. The relationship between BMD and nutritional factors were analyzed. In the femoral neck, 5.7% of adults was classified as osteopenia and 47.9% and 37.8% of the elderly were classified as osteopenia and osteoporosis. It was shown that plant protein, Ca, p, Fe, thiamin, riboflavin and vitamin C intakes were related with BMD in all age groups. As for the mean adequacy ratio (MAR) of nutrients, the lowest quartile group of BMD showed significantly lower MAR among children. The RDA percent of nutrients was a strong influential factor on BMD. Subjects who consumed below 75% of Korean RDA in energy, vitamin A, thiamin, and vitamin C showed lower BMD. Stepwise multiple regression analysis revealed that MAR in children, vegetable Ca in adolescents, and vitamin C in adults and elderly people were the highest influential factor on BMD. Therefore, the above results demonstrated that not only calcium but also other nutrients such as protein, iron, vitamin A, riboflavin, and vitamin C were necessary in order to keep the healthy bone status. In addition, although there were various dietary factors that influenced bone density, MAR was identified as the major factor that affected bone density. Thus, a balanced diet that includes all nutrients is necessary for a healthy bone density. (Korean J Nutrition 37(2) : 132-142, 2004)

• Polymer(Korea)
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• v.38 no.4
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• pp.544-549
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• 2014

Double layered film consisting of polyimide/polysiloxane and interface with nano domain structure was fabricated through stepwise layer formation and subsequent aging steps. During aging of film, nano phase separation occurred between the top layer polysiloxane and the upper layer of polyimide, which was observed by transmission electron microscope (TEM). A stable and uniform polysiloxane layer was obtained, showing the reproducible pressure-sensitive adhesion (PSA) property with the peel strength of 8-13 g/inch at even $300^{\circ}C$. In addition, the resulting polymide/polysiloxane film was thermo-stable up to $435^{\circ}C$, providing the promising properties suitable for application in microelectronics processing.

• The Journal of Korean Academic Society of Nursing Education
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• v.21 no.4
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• pp.518-527
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• 2015

Purpose: This study aimed to identify a relationship between the communication competence and social anxiety in nursing students. Methods: With a cross-sectional survey, a convenience sampling of 303 nursing students was taken from P-university in Y-city. The instrument for the study was a questionnaire that is consisted of the general characteristics, an Interaction Anxiousness Scale (IAS) and a Global Interpersonal Communication Competence Scale (GICC). Data was analyzed using descriptive statistics, t-test, one-way ANOVA, Kruskal-Wallis, Pearson's correlation coefficients and stepwise multiple regression with SPSS version 21.0. Results: The mean score of the IAS was $41.89{\pm}8.74$ and the GICC was $3.51{\pm}0.34$. Communication competence significantly differed by the satisfaction of major (F=10.86, p<.001). In addition, the satisfaction of interpersonal relationships was significantly different in both communication competence (F=17.52, p<.001) and social anxiety (F=23.85, p<.001). Social anxiety had a negative correlation with communication competence (r=-.48, p<.001). Social anxiety accounted for 55.3% of the variance -social relaxation (${\beta}$=-.62), assertiveness (${\beta}$=-.18), interaction management (${\beta}$=.14) and efficiency (${\beta}$=-.13)- of communication competence's subcategories. Conclusion: It was found that communication competence has an influence on social anxiety. Therefore, education programs are needed to promote communication competence for a decline of social anxiety in nursing students.

• Journal of Korean Public Health Nursing
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• v.28 no.2
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• pp.228-240
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• 2014

Purpose: This study was conducted in order to determine the influences of knowledge, self-efficacy, and social support on sick role behavior in patients with coronary artery disease. Methods: The participants were 192 patients with coronary artery disease in D city. Data were collected from January 1, 2014 to April 30, 2014 using a questionnaire. Data analysis was performed using SPSS/WIN 19.0 using ANOVA, t-test, Pearson correlation, and stepwise multiple regression. Results: Factors having an influence on sick role behavior were age (70 years old ${\beta}$=.275, p<.001), occupation (Office job ${\beta}$=-.230, p<.001), knowledge (${\beta}$=.204, p<.001), self-efficacy (${\beta}$=.188, p<.001), underlying disease (stroke ${\beta}$=.142, p=.008), and family type (live with their children ${\beta}$=-.128, p=.038). These factors explained 56% of the variance in sick role behavior. Conclusions: More positive knowledge and self-efficacy are needed for the sick role behavior. In addition, results of the study indicated that age, occupation, underlying disease, and family type were very important in predicting health behaviors of patients with coronary artery disease. Thus, it would be necessary to include patients' characteristics in designing an education program for people with coronary artery disease.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.2
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• pp.357-372
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• 2012

Existing e-learning systems not only require complex admission processes but also do not give stepwise education methods according to individual learners' characteristic. These circumstances cause learners to lose educational interest so that their educational efficiency decreases. In particular, the present e-learning systems do not provide educational approaches suitable for infant and elementary children. Under this system, the e-learning education for children does not proceed completely without guardians. To solve this problem, we design and implement an English e-learning system for elementary children based on friendly and comfortable user interfaces. For children, the proposed system reflects their age and individual interesting per each e-learning stage. This system supports both the Web application platform and smart phone application platform for various client requirements. The proposed system manages 3 classes as English learning content. Learners can experience their own English e-learning course in each class, which is compiled by current educational ability. In addition to the general functions in e-learning system, the proposed system develops content buffering algorithm to reduce data traffic in server.

• Child Health Nursing Research
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• v.10 no.2
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• pp.173-179
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• 2004

Purpose: The purpose of this study was to offer basic data concerning the prevention of obesity for obese children to identify the relationship between their self-efficacy and the degree of performance on health promoting lifestyle profile. Method: The subjects were 148 fourth to sixth grade elementary school students in Gwang-ju, Korea during the period from September 10 to September 25, 2001. The collected data were analyzed by mean, standard deviation, t-test, ANOVA, Pearson's Correlation Coefficient and Stepwise Multiple Regression by using the SPSS program. Result: The relationship between general characteristics of subjects and self-efficacy were significant differences according to eating time(F=5.338, p=.006). The relationship between general characteristics of subjects and health promoting lifestyle profile were significant differences according to grade(F=5.615, p=.005), eating time(F=8.591, p=.000), concern about weight control(F=3.915, p=.022), experience of weight control(t=7.632, p=.006). Health promoting lifestyle profile was showed significant positive correlations with self-efficacy(r=.537, p=.000). Self-efficacy(27.6％) was the highest factor predictor health promoting lifestyle profile of obesity students. In addition to eating time, concern about weight control, explained for 33.3％ in health promoting lifestyle profile. Conclusion: Results of this study point to self-dfficiency as a major factor in the health promoting behavior of childhood obesity. According to the results of this study, There is a reason to develop a health program to promote self-efficiency.

• Journal of muscle and joint health
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• v.11 no.1
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• pp.50-60
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• 2004

Purpose: The purpose of this study was to examine the relationships among the health promoting behavior, pain, self-esteem, family support, self-efficacy in patients with chronic arthritis. Method: The data for this study were collected from February 19, 2003 to April 7, 2003. The subjects were 150 chronic arthritis patients who visited University Hospital in D City. The research instruments used in this study were HPLP II, Visual analogue scale, Self-esteem scale, Family support scale, Self-efficacy scale. In data analysis, SPSS PC ver 10.0 program was utilized and data were analyzed using descriptive statistics and t-test, ANOVA, Multiple Stepwise Regression and Pearson's correlation coefficient. Result: The average score of the pain, self-esteem, family support, self-efficacy, health promoting behavior was 5.38, 3.37, 4.29, 70.30, 2.68, respectively and the variable with the highest degree of it's subscale was interpersonal support(3.08), whereas the one with the lowest degree was exercise(1.66). There was a positive correlation(r=.327, p=.000) between the self-esteem and health promoting behavior. There was a positive correlation(r=.540, p=.000) between the family support and the self-efficacy and health promoting behavior. Family support, self-efficacy and marital status were significant factors to explain a variance of health promoting behavior in patients with chronic arthritis(51.6%). health promoting behavior. There was a positive correlation(r=.477, p= .000) between Conclusion: The health promoting behavior were positively correlated with self-esteem, family support and self-efficacy. These findings help to understand relationships among self-esteem, family support and self-efficacy in chronic arthritis patients. In addition, family support, self-efficacy and marital status were the mainly influencing factors of health promoting behavior. Among these variables family support was the most significant factor to predict a health promoting behavior. According to the results of this study, family support must be considered as a main factor in the nursing strategy for health promoting behavior of chronic arthritis patients.

• Journal of the Korean Society for Library and Information Science
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• v.27
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• pp.291-339
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• 1994

The purpose of this study is to find personal characteristics that affect users' cognitive characteristics of system, and to verify correlations between this users' cognitive characteristics and selection of system usage in using end -user searching systems (EUSS), For corroborative analysis of this study, preliminary model was constructed referring to Davis' Technology Acceptance Model. The model consists of exogenous variables (personal characteristics) , parameter variables (perceived usefulness, perceived ease of use), and effect variables (selection of system usage), When exogenous variables affect parameter variables, exogenous variables are independent variables and parameter variables are dependent variables. In addition, in correlation of parameter variables, which have been affected by exogenous variables, with effect variables, parameter variables are independent variables and effect variables are dependent variables, As for the research methodology, this study regards the Academic Information System connected with the Internet as EUSS, So questionnaires have been sent to researchers in universities who were conducting direct searching for the system. 229 valid responses to questionnaires have been analyzed according to Pearson Correlation Analysis and Stepwise Selection of Multiple Regression in the statistical software packages, 'SPSS PC+'. The findings and conclusions made in this study are summarized as follows; 1. Among the personal characteristics (age, disciplinary, computer literacy level, perceived usefulness of use education and training, perceived satisfaction of end-user searching, perceived satisfaction of system characteristics), all characteristics but age affect perceived usefulness and perceived ease of use. Specifically, perceived satisfaction of end user searching and perceived satisfaction of system characteristics most affect perceived usefulness and perceived ease of use respectively. 2. Perceived usefulness and perceived ease of use have a direct effect on selection of system usage in using EUSS. 3, Perceived usefulness more affect selection of system usage than perceived ease of use in using EUSS.