• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.8
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• pp.5492-5500
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• 2015

Low-density lipoprotein cholesterol (LDL-C) is a major modifiable risk factor for cardio- cerebrovascular disease. In clinical practice, however, it is primarily calculated using the Friedewald formula as a cost-effective method. The aim of this study was to compare Friedewald-estimated and directly measured LDL-C values and assess the concordance in guideline LDL-C risk classification between the two methods. The data were derived from the 2009 and 2010 Korea National Health and Nutrition Survey (KNHANES). Analysis was done for 4,319 subjects with lipid panels-total cholesterol (TC), high-density lipoprotein cholesterol (HDL-C), directly measured LDL-C using an enzymatic homogeneous assay, and triglycerides (TG). For subjects with TG lower than 400 mg/dL, Friedewald-estimated and directly measured LDL-C were highly correlated (r = 0.958, p < 0.001) and overall concordance was 82.7%. As TG increased, overall concordance decreased. Overall concordance was 85.4% at TG lower than 150 mg/dL; 78.2% at TG of 150-199 mg/dL; and 71.4% at TG of 200-399 mg/dL. The Friedewld equation tended to overestimate LDL-C when TG are of < 150 mg/dL; however, underestimate LDL-C when TG are of ${\geq}150mg/dL$. As a result, Friedewald estimation misclassified 382 subjects (9.1%) in a higher category versus 348 subjects (8.3%) in a lower category. Our findings suggest that overestimation of LDL-C by the Friedewald formula can be a great problem as well as underestimation.

• The Journal of the Korea Contents Association
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• v.12 no.9
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• pp.468-478
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• 2012

It is essential to have a trust with customer, especially in the airline context which provide the best service and movement to particular destinations. However, previous researches were performed only within restricted variables regarding this topic. Thus the purpose of this research was to investigate the relationship among trust's antecedents, trust and loyalty. A convenience sample of 298 travelers from airline customers was surveyed and 286 usable questionnaires were analyzed. According to the literature review, trust's antecedents were divided into the following variables: 'competence', 'benevolence' and 'problem solving ability'. Trust objects were divided into 'company trust' and 'front line service employee(FLSE) trust' accordingly. The findings of the study are as follows. First, company trust's antecedents which are 'competence', 'benevolence' and 'problem solving ability' yielded positive effects on company trust. Specifically, 'competence' has the strongest influence among variables. Second, as far as FLSE trust's antecedents are concerned, only 'competence' and 'problem solving ability' have positive effects on FLSE trust. Third, both company trust and FLSE trust influenced each other. Lastly, both company trust and FLSE trust have positive effects on loyalty.

• The Journal of the Korea Contents Association
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• v.12 no.2
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• pp.358-368
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• 2012

The purpose of this study was to discover the factors affecting on physical activity levels of community-dwelling older adults in Korea. The data was analyzed on 12,322 older adults, aged 65 or above, from the 2008 National Elderly Survey. The results of this study were as follows: First, 29.9% of older men and 46.4% of older women were classified as physically inactivity. Second, age(OR=1.44, p<.001), education(OR=1.17, p=.026), location of residence(OR=1.19, p=.016), perceived health status(OR=2.18, p<.001), chronic disease(OR=1.23, p=.020), pain(OR=1.24, p=.011), ADL(OR=1.86, p<.001), fear of fall(OR=1.26, p=.003), depression(OR=1.78, p<.001) predicted physical activity levels in older men. Age(OR=1.54, p<.001), perceived health status(OR=1.63, p<.001), pain(OR=1.45, p<.001), falling experience(OR=1.24, p=.001), ADL(OR=1.72, p<.001), depression(OR=1.46, p<.001) predicted physical activity levels in older women. It is suggested that the findings of this study are helpful to develop effective physical activity interventions for older adults.

• Journal of dental hygiene science
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• v.13 no.4
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• pp.393-402
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• 2013

The purpose of this study was to examine the relationship between vitamin D and periodontal diseases based on the raw data of the 5th National Health & Nutrition Examination Survey of 2010. The subjects in this study were 1,327 people, and those whose data on major variables were missing and who suffered from diabetes and/or osteoporosis were excluded. As for data analysis, R2.15.1 program and PASW Statistics 18.0 were utilized. The findings of the study were as follows: 1. As for all the respondents aged 50 and up, there was no significant relationship between vitamin D and periodontal diseases. 2. As for the post-menopausal women including the women who underwent bilateral ovariectomy, the vitamin D-deficit group 1 (<10) were 6.66-fold more likely to suffer from periodontal diseases than the vitamin D-sufficient group (${\geq}30$) (OR, 6.66; 95% CI, 1.004~44.19). The above-mentioned findings ascertained that vitamin D had a significant negative correlation to periodontal diseases among the post-menopausal women including the women who underwent bilateral ovariectomy. This finding should be taken into account in terms of the prevention and management of periodontal diseases.

• Informatization Policy
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• v.27 no.3
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• pp.39-55
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• 2020

This study was designed to analyze the relationship among the motivations for the use of digital devices, attitudes toward the use of digital devices and performance resulting from the use of digital devices in middle-aged and elderly groups by using a path analysis. For an empirical analysis, the 2018 Survey on the Digital Divide by the National Information Society Agency was referenced, analyzing the data of 1,664 people, selected through listwise deletion from total 2,303 people aged 55 or over. A close examination of how measuring variables reflect potential variables (motivations for, attitudes toward and performance resulting from the use of digital devices) showed a significance of 0.001, which suggests that each individual measuring variable does reflect the potential variables. Evaluation of the pathway factors of the structural model from the motivations for the use of digital devices to the attitudes toward the use of digital devices (β=0.847) and from the attitudes toward the use of digital devices to the performance resulting from the use of digital devices (β= 0.745) revealed significant statistical effects. The results of this study suggest that the motivations for the use of digital devices does not directly enhance the digital device use performance, but that it can improve the attitudes toward the use of digital devices, which can in turn increase the performance resulting from the use of digital devices. The analysis holds significance that it has presented practical and policy implications.

• Journal of Gifted/Talented Education
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• v.23 no.1
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• pp.49-65
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• 2013

The purpose of this study is to investigate the longitudinal impact of the engagement of private tutoring on student achievement and the influence of the engagement of gifted education on the effect of private tutoring by applying hierarchical linear growth modeling technique on the KELS (Korean Education Longitudinal Study) data. For the analysis, we used KELS data including the score of Mathematics achievement from 2005 to 2007 in order to get useful variables like whether or not to engage private tutoring, weekly time and monthly cost of private tutoring, the experience of gifted education, gender, prior achievement of 6th grade, parents' monthly income, internal motivation and self-efficacy. The sample consisted of 4,435 7th graders from Korean middle schools who were included in the KELS and have the data available to a significant dataset having no missing values include. The result suggest that the private tutoring experience predicted students' high Mathematics achievement and the interaction between grade and private tutoring time and cost has negative impact on the mathematics achievement. In contrast, it was found that the experience of gifted education has negative impact on the growth of mathematics achievement, but positive impact on the effect of private tutoring cost on the mathematics achievement. In other words, the experience of gifted education shows affirmative impact on the effect of private tutoring cost on the mathematics achievement indirectly. On the basis of this results, we discussed deeply the effect of private tutoring on the Mathematics achievement and the influence and its meaning of the experience of gifted education on the effect of private tutoring.

• The Journal of the Korea Contents Association
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• v.12 no.6
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• pp.249-264
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• 2012

The purpose of this study is to clarify the general concept and preparation process for successful aging. At the same time another object is to find out factors which were affecting influences on the preparations for the old age and analyze the relationships between the factors and preparation for old age. 280 questionnaires were distributed to over 40 years-old workers working in Banwol and Siwha industrial complex in Kyeonggi-do. Using 261 questionnaires, frequency analysis, factor analysis and multiple regression analysis, etc were executed with SPSS 18.0 to fulfill the purposes. Findings of the study are as follows. First, health condition had a positive effect on the general preparation for old age, but age, educational career, monthly income, religion and the number of children had partially positive effects. Second, job satisfaction had a positive effect on physical and economical preparation for old age, but job commitment had a positive effect on economical preparation only. Third, Age, educational career, spouse, religion, health condition and the number of children showed different effects on those preparations.

• The Journal of the Korea Contents Association
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• v.13 no.7
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• pp.395-405
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• 2013

The purpose of this study is to examine the relationship among the emotional labor, burnout, and organizational commitment in airline context. In this study, 2 hypotheses based on literature reviews were employed. Questionnaire was also developed based on previous studies. A convenience sample of 163 flight attendants was surveyed and 153 usable questionnaires were analyzed. According to the literature review, emotional labor was divided into 'surface acting' and 'deep acting'. Burnout, on the other hand, was categorized into the following variables: 'emotional exhaustion', 'depersonalization' and 'reduced feelings of personal accomplishment' accordingly. Then the data and hypotheses were examined using structural equation modeling (SEM) by AMOS. The results are as follows. Firstly, emotional labor has no effect on 'emotional exhaustion' while emotional labor has negative effects on 'depersonalization' and 'reduced feelings of personal accomplishment'. Secondly, 'depersonalization' and 'reduced feelings of personal accomplishments'' factor have negative effects on organizational commitment while 'emotional exhaustion' has no effect on organizational commitment. Continuous and systematic training should be conducted to administer 'emotional labor'. Consulting system should also be conducted to reduce burnout and systematic procedure is also needed to induce positive results from burnout.

• Culinary science and hospitality research
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• v.18 no.5
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• pp.45-62
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• 2012

The purpose of this study is to secure the basic data for the physical environment of an eco-friendly restaurant by surveying and analyzing customer perceptions of the servicescape of an eco-friendly restaurant and to verify the organic causation of the servicescape of an eco-friendly restaurant and customer perceived value, attitude and behavior intention. The samples for empirical analysis were selected from the customers over 20 years who lives in Seoul and Kyung-gi suburbs have experienced visiting eco-friendly restaurant or green restaurant more than once a month. Total 300 copies of questionnaire were distributed for the survey from the second day to the fifteenth day of April for 14 days, and total 264 (88.0%) copies of survey questionnaire except for some questionnaires that had much strong lean tendency or the missing value was discovered. The research results are as follows; when a customer recognizes an eco-friendly restaurant favorably, he or she considers that servicescape plays an important role in deciding perceived value through tangible and intangible perceived values. Since, customer perceived value has a positive effect on attitude and behavior intention, the customer considers as affected on his/her behavior intention when satisfied with the eco-friendly restaurant, which is considered that positive customer attitude will have an effect on behavior intention. Thus, it is considered based on this in-depth analysis result that maintaining and providing servicescape of high standard in the manager's perspective will have a direct effect on ensuring tangible outcomes.

• Journal of the Korean Society of Marine Environment & Safety
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• v.21 no.5
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• pp.599-607
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• 2015

The purpose of this study is to reproduce long-term wave fields in coastal waters of Korea based on wave hind-casting modelling and discuss its applications. To validate wind data(NCEP, ECMWF, JMA-MSM), comparison of wind data was done with wave buoy data. JMA-MSM predicted wind data with high accuracy. But due to relatively longer period of ECMWF wind data as compared to that of JMA-MSM, wind data set of ECMWF(2001~2014) was used to perform wave hind-casting modelling. Results from numerical modelling were verified with the observed data of wave buoys installed by Korea Meteorological Administration(KMA) and Korea Hydrographic and Oceanographic Agency(KHOA) on offshore waters. The results agree well with observations at buoy stations, especially during the event periods such as a typhoon. Consequently, the wave data reproduced by wave hind-casting modelling was used to obtain missing data in wave observation buoys. The obtained missing data indicated underestimation of maximum wave height during the event period at some points of buoys. Reasons for such underestimation may be due to larger time interval and resolution of the input wind data, water depth and grid size etc. The methodology used in present study can be used to analyze coastal erosion data in conjunction with a wave characteristic of the event period in coastal areas. Additionally, the method can be used in the coastal disaster vulnerability assessment to generate wave points of interest.