• Journal of Information Processing Systems
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• v.11 no.3
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• pp.465-482
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• 2015

IEEE 802.11p is a standard MAC protocol for wireless access in vehicular environments (WAVEs). If a packet collision happens when a safety message is sent out, IEEE 802.11p chooses a random back-off counter value in a fixed-size contention window. However, depending on the random choice of back-off counter value, it is still possible that less important messages are sent out first while more important messages are delayed longer until sent out. In this paper, we present a new scheme for safety message scheduling, called the enhanced message priority mechanism (EMPM). It consists of the following two components: the benefit-value algorithm, which calculates the priority of the messages depending on the speed, deceleration, and message lifetime; and the back-off counter selection algorithm, which chooses the non-uniform back-off counter value in order to reduce the collision probability and to enhance the throughput of the highly beneficial messages. Numerical results show that the EMPM can significantly improve the throughput and delay of messages with high benefits when compared with existing MAC protocols. Consequently, the EMPM can provide better QoS support for the more important and urgent messages.

• Journal of Preventive Medicine and Public Health
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• v.46 no.4
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• pp.183-191
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• 2013

Objectives: In Korea, the proportion of deaths due to alcohol is estimated at 8.9%, far exceeding the global estimate of 3.8%. Therefore, this study was performed to examine the factors associated with low-risk, moderate-risk, and high-risk drinking patterns in Korean adults and to identify target populations for prevention and control of alcohol-related diseases and deaths. Methods: We analyzed data from 230 715 Korean adults aged 19 years and older who participated in the 2009 Korean Community Health Survey. Multinomial logistic regression analysis was used to examine associations between socio-demographic and health-related factors and patterns of alcohol use. Results: A substantially larger proportion of men than women engaged in high risk (21.2% vs. 3.4%) and moderate-risk alcohol use (15.5% vs. 8.2%). In both sexes, moderate- and high-risk uses were associated with younger age, higher income, being currently employed, smoking, being overweight/obese, and good self-rated health. Conclusions: Given the large proportion of the population that is engaging in moderate- and high-risk drinking and given the social norms that support this behavior, public health policies and campaigns to reduce alcohol consumption targeting the entire population are indicated.

• Journal of Information Processing Systems
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• v.10 no.2
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• pp.314-333
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• 2014

When analyzing default predictions in real estate companies, the number of non-defaulted cases always greatly exceeds the defaulted ones, which creates the two-class imbalance problem. This lowers the ability of prediction models to distinguish the default sample. In order to avoid this sample selection bias and to improve the prediction model, this paper applies a minority sample generation approach to create new minority samples. The logistic regression, support vector machine (SVM) classification, and neural network (NN) classification use an imbalanced dataset. They were used as benchmarks with a single prediction model that used a balanced dataset corrected by the minority samples generation approach. Instead of using prediction-oriented tests and the overall accuracy, the true positive rate (TPR), the true negative rate (TNR), G-mean, and F-score are used to measure the performance of default prediction models for imbalanced dataset. In this paper, we describe an empirical experiment that used a sampling of 14 default and 315 non-default listed real estate companies in China and report that most results using single prediction models with a balanced dataset generated better results than an imbalanced dataset.

• Korean Journal of Remote Sensing
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• v.10 no.2
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• pp.121-132
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• 1994

A GIS based tactical terrain analysis system named ATTAS(Army Tactical Terrain Analysis Software) has been designed and implemented to support the field commanders for enhancing the capabiliy of their unit and efficiency of weapon system. This system is designed to provide computer graphics environment in which the analyst can interactively operate the entire analyzing process such as selecting the area of interest, performing analysis functions, simulating required battlefield operation and display the results. This system can be divided into three major sections; the terrain analysis modules, utilites, and graphic editor. The terrain analysis module inclused surface analysis, line of sight analysis, enemy disposition, 3D display, radar coverage, logistic route analysis, shortest path analysis, atmospheric phenomena prediction, automated IPB (Inteligence preparation of Battlefield), and other applied analysis. A combination of 2D and 3D computer graphics techniques using the X-window system with OSF/Motif in UNIX workstation was adopted as the user interface. The integration technique of remotely sensed images and GIS data such as precision registration, overlay, and on-line editing was developed and implemented. An efficient image and GIS data management technique was also developed and implemented using Oracle Database Management System.

• Child Health Nursing Research
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• v.25 no.4
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• pp.449-457
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• 2019

Purpose: The purpose of this study was to identify predictors of eating disorders in adolescents with type 1 diabetes, with the goal of providing data in support of nursing interventions to improve their health. Methods: A total of 136 adolescents aged 13-18 years with type 1 diabetes completed the Diabetes Eating Problem Survey-Revised, Rosenberg Self-Esteem Scale, and the Beck Depression Inventory-II, using structured self-reported questionnaires. The collected data were analyzed using the t-test, $x^2$ test, and binominal logistic regression with SPSS version 23.0 for Windows. Results: The prevalence of eating disorders in adolescents with type 1 diabetes was 39%. Four significant predictors of eating disorders were identified; absence of body satisfaction (odds ratio [OR]=3.87, 95% confidence interval [CI]=1.55~9.65), depression (OR=2.87, 95% CI=1.13~7.28), female gender (OR=2.67, 95% CI=1.09~6.54), and glycosylated hemoglobin type A1c levels (OR=1.47, 95% CI=1.10~1.97). Conclusion: In order to prevent eating disorders among adolescents with type 1 diabetes, programs for managing adolescents' depression and improving their body satisfaction should be developed. Futhermore, more attention should be directed towards programs aiming to prevent eating disorders in female adolescents.

• Journal of Korean society of Dental Hygiene
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• v.21 no.5
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• pp.585-594
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• 2021

Objectives: This study aimed to understand the effect of factors, possibilities, and desires on oral examination experience behavior of the elderly using raw data from the 2017 Community Health Survey. Methods: Hierarchical logistic regression analysis, an analysis method that controls the input order of a series of independent variables, was performed for 67,835 senior citizens aged 65 and older. Results: In terms of predisposing factors-in women, the higher the level of education, the higher the oral examination practice rate, and the lower the oral examination practice rate in divorce and bereavement among those aged 75 years or older. Regarding enabling factors, the lower the income rating, the higher the oral examination experience rate in religious and social participants as well as, leisure and charity participants, and the lower the oral examination experience rate in the natural environment. Regarding the need factors, the oral examination practice rate was high when the subjective oral health level was recognized as good. Conclusions: As a result, Anderson's model confirmed that various factors affect oral examination experience behavior, and institutional support for policy consensus is needed to promote oral examination experience behavior in older people in various directions.

• Journal of the Korean Society of School Health
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• v.34 no.1
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• pp.53-61
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• 2021

Purpose: The purpose of this study was to investigate the affect of eating behaviors on subjective health of multi-cultural adolescents in South Korea. Methods: This study is designed as cross-sectional. Using the statistics from the 15th (2019) Korea Youth Risk Behavior Web-based Survey, multiple logistic regression analysis was conducted. Overall, 711 multi-cultural adolescents were included in the analysis. Results: When analyzing the factors affecting the subjective health status of multi-cultural adolescents, normal body mass index (OR: 0.56, 95% CI: 0.35~0.89) and milk consumption (OR: 0.54, 95% CI: 0.35~0.83) showed a lower risk of being unhealthy, while skipping breakfast for 5 days (OR: 1.97, 95% CI: 1.33~2.93) and convenience store food consumption (OR: 1.59, 95% CI: 1.05~2.40) showed a higher risk of being unhealthy. Conclusion: It is necessary to form positive eating habits that influence the subjective health perception of multi-cultural adolescents. Therefore, appropriate dietary education and systematic support should be provided for multi-cultural families.

• The Journal of Korean Society for School & Community Health Education
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• v.19 no.3
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• pp.65-77
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• 2018

Background & Objectives: This study aims to investigate the health status of family caregivers with dementia patients and identify the factors related to their anxiety and depression. Methods: Data from 2015 Community Health Survey(n=2,426) was used. A chi-square test was performed to investigate the health status of family caregivers, and a multiple logistic regression analysis was used to identify the factors associated with anxiety and depression. Results: Odds ratio(OR) of anxiety and depression was 1.29 times higher in female, 2.49 times higher in over 70 years versus under 39 years. ORs were lower 34.0%, 26.0%, 26.0% in the working group, the physical activity group, the alcohol drinking group respectively. ORs of anxiety and depression were 4.54 times, 1.57 times higher in the stress group, the chronic disease group respectively. And ORs were 61.0%, 28.0% lower respectively when social networks and social activities was present. Conclusions: The rate of experiencing anxiety and depression was high in family caregivers with dementia patients. It is necessary to provide diverse programs to reduce the burden of family support, anxiety and depression of family caregivers.

• Journal of Korean society of Dental Hygiene
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• v.18 no.6
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• pp.957-967
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• 2018

Objectives: The aim of this study was to confirm health behaviors that affect periodontal health status. Based on these results, we also intended to provide information for the prevention of gingivitis prior to periodontitis and establish strategies for maintaining healthy periodontal tissues. Methods: Data for this descriptive study were extracted from the Korea National Health and Nutrition Examination Survey 2013-2015. A total of 2,710 adults, aged 19-39 years were included in this study. Complex logistic regression analyses were performed to confirm relationships between health behaviors and periodontal health, after adjusting for socio-demographics, oral and systemic health status. Results: Dental clinic visits (odd ratio [OR] = 1.761, 95% confidence interval [CI]; 1.391-2.229), use of floss (OR = 1.504, 95% CI; 1.213-1.865), and non-smoking (OR = 1.269, 95% CI; 1.040-1.549) were found to support periodontal health. Conclusions: Dental visits for continued professional oral health care, self-oral care including interdental flossing, and a non-smoking habit, are necessary for periodontal health maintenance. Additionally, the results suggest that physical activities such as regular walking can help. These methods should be considered as the primary preventative care strategies for minimizing the occurrence of gingival inflammation.

• Journal of Korean Clinical Health Science
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• v.6 no.2
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• pp.1180-1188
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• 2018

Purpose. This study was to effects of major satisfaction of dental hygiene students and students on self-efficacy and career preparation behavior by investigation to provide basic data for developing a systematic career customized employment support program. Methods. The data were collected from 249 students from December 1 to 10 day 2016 in Yeongnam region. Data analysis was performed using descriptive statistics frequency, t-test(One-way ANOVA), logistic regression by SPSS WIN 18.0 program. Results. According to the general characteristics department dental hygiene students were major satisfied with 59.8%. Satisfaction with career decision self-efficacy and career preparation self-efficacy was found to $68.30{\pm}10.21$ statistically significant(p<.001). Satisfaction was also found to statistically significant ($32.65{\pm}6.05$) in career preparation behavior(p<.05). Satisfactory scores were found to 1.306 times higher than the dissatisfied students in the career decision self-efficacy goal setting. It was found that 8.423 times in satisfaction of career planning in career preparation. Conclusion. Considering the effects of dental hygiene students' major satisfaction on career decision self - efficacy and career preparation behavior, it would be good if we could develop and use various programs to improve the satisfaction of students in their majors.