• Journal of the military operations research society of Korea
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• v.34 no.3
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• pp.1-12
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• 2008

Design of supply chain network (SCN) is required to optimize every factor in SCN and to provide a long-term and strategic decision-making. A mathematical model can not reflect the real world because design of SCN contains variables and stochastic factors according to status of its system. This paper presents the designing methodology of military SCN using the mathematical model and the simulation model. It constructs SCN to minimize its total costs using the Mixed Integer Programming (MIP) model. And we solve problems of a vehicle assignment and routing through adaptation of experiment parameters repeatedly in the simulation model based on the results from the MIP model. We implement each model with CPLEX and AutoMod, and experiment to reconstruct SCN when the Logistic Support Unit is restricted to support military units. The results from these experiments show that the proposed method can be used for a design of military SCN.

• Physical Therapy Korea
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• v.12 no.3
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• pp.1-10
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• 2005

The purpose of this study was to examine associations between subjective symptoms of musculoskeletal diseases and the degree of job stress among shipyard workers. The study population was 7,078 employees of the D shipbuilding company. Survey data was obtained from 1,727 employees using a proportional sample according to age and a self-administered questionnaire. The associations were examined with ${\chi}^2$ and logistic regression. The main results were as follows: First, the prevalence of musculoskeletal disease in any one part is 59.5% by NIOSH standard. Second, subjects who had worked in the shipyard for over five years had a prevalence of musculoskeletal disease 1.8 times higher than subjects who had worked in the shipyard for less than five years (p<.01). Finally, those who had less support from co-worker's had a prevalence of musculoskeletal disease 1.3 times higher than subjects who had more support from co-worker's (p<.05). Throughout the results, shipyard workers had higher occurrences of musculoskeletal diseases than other manufacturing workers and the risk of musculoskeletal disorder tended to increase with higher job stress. In this research, the plan to reduce musculoskeletal diseases involved making a program and policy which would be able to lower job stress socio-psychologically. This research will prove useful by using basic preventive materials to improve the musculoskeletal health of labores who work in shipyards and similar places.

• Science of Emotion and Sensibility
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• v.16 no.3
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• pp.409-416
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• 2013

Attention is one of important cognitive functions in human affecting on the selectional concentration of relevant events and ignorance of irrelevant events. The discrimination of attentional and inattentional status is the first step to manage human's attentional capability using computer assisted device. In this paper, we newly combine the non-linear recurrence pattern analysis and spectrum analysis to effectively extract features(total number of 13) from the electroencephalographic signal used in the input to classifiers. The performance of diverse types of attention-inattention classifiers, including supporting vector machine, back-propagation algorithm, linear discrimination, gradient decent, and logistic regression classifiers were evaluated. Among them, the support vector machine classifier shows the best performance with the classification accuracy of 81 %. The use of spectral band feature set alone(accuracy of 76 %) shows better performance than that of non-linear recurrence pattern feature set alone(accuracy of 67 %). The support vector machine classifier with hybrid combination of non-linear and spectral analysis can be used in later designing attention-related devices.

• Korean Journal of Health Education and Promotion
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• v.25 no.3
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• pp.1-19
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• 2008

Purpose: The research was performed to distinguish the group of users of the health promotion programs in health care center, to identify the characteristics of this group, and to investigate the factors that have influence on the use of the health programs. The specific research purposes are: First, to compare the group which uses the health promotion program of health care center and that which does not. Second, to analyze the factors that have influence on the use of the health promotion program. Method: This study was done from November 15th 2006 and March 30th 2007. The study subjects were Seoul and Provinces. Seoul was divided into 4 areas of eastern western, northern, and southern area. Provinces were Gimchon, Gumi and Sosan. From each area, one health care center was chosen from the ones that wanted to participate. Total number of observations was 994. The survey questionnaire consisted of individual, interpersonal, organizational, community, policy factors based on socio-ecological model. The analysis method was logistic regression. Results: Odds ratios of individual factors is sex(1.39), age(1.05), marriage status(1.71) severity(1.20). Odds ratios of interpersonal factors is use and support of family(1.96), use and support of resource persons like friends and neighbor(4.58). Odds ratios of organizational factors is the comfortness of space(0.74), the satisfaction of health care center facility(1.40), kindness of employ(1.97). Odds ratios of community factors is health care center program recognition(1.70). Odds ratios of policy factors is advertisement(4.69) and expense(1.42). Conclusion: Socio-ecological model of health promotion in health care center is obtained based on five factors and health planners should consider these determinants of health promotion program in health care center and develop intervention methods.

• Korean Journal of Human Ecology
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• v.16 no.2
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• pp.315-331
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• 2007

The purpose of this study is to examine current situations about and factors related to expenditures of private education among pre-school children and to provide policy implications useful for future pre-school children education. The subjects of the study were parents of pre-school children under seven years of age, who lived in Seoul and Incheon area. The survey was conducted using parent questionnaire. The major findings of the study are: First, 86.8% of parents of pre-school children use private education and the average expenditure on it was 154, 446 won. Second, major factors determining their private education expenditure are educational level of parents, parents' job characteristics, household income, and region. Third, the most important reason for using private education among parents is to improve and excel in academic performance of their children. Forth, the higher the parents' expected returns from private education are, the higher the expenditure level of private education is. Fitth, the results of the logistic regressions showed that parents' attitudes toward private education was the most important factor in determining household economic burden associated with private education. The odds were 5 times greater for the parent group with strong desire for private education than for the parent group without it and 1.2 times greater for the parent group with high-expected returns from private education than the parent group without it. In conclusion, systematic, universal educational policies need to be developed to provide and support all the parents with pre-school children, given that their current economic burden is substantial. By providing such support, we can help parents focus on public education. This study examining current situations about and determining factors related to private education expenditures among pre-school children collected data limiting only Seoul and Inchoen area, therefore, future studies need to include data collected nationwide for generalizability of the findings. As well, development of more elaborated survey instruments and analytical methods would advance our understanding in the field.

• The Journal of Korean Association of Computer Education
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• v.8 no.5
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• pp.63-72
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• 2005

The purpose of this study is finding factors affecting the decision of Web-based learning system (Edunet) use and searching for ways to diffuse Edunet use. Based on the diffusion of innovations theory and the results of the previous studies about web-based instruction, seven predictors influencing the decision of Edunet use were extracted. Seven variables as the followings; (1) perceived attributes of innovation (Relative Advantage, Compatibility, Complexity) (2) Innovativeness (3) Self-efficacy (4) Subjective Norm (5) Support. The participants were 315, 5-6th grade elementary school students, and the questionnaire was 20-item with 7-point Likert scales. To analyze the collected data and test the hypothesis, binary logistic regression was employed. The result indicated that the fitness of regression model including seven decision factors was proved. In addition, two factors, subjective norm and support, were identified as the important decision factors of Edunet use.

• Korean Journal of Health Education and Promotion
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• v.20 no.3
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• pp.221-237
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• 2003

As the population ages, health problems of the elderly, including functional disorders and cognitive impairment, have become some of the most important social issues in Korea. The purpose of this study is to discover the rate of prevalence and factors related to dementia among the elderly in Jeju Province. 2405 elderly in Jeju Province were interviewed, using a questionnaire consisting of sociodemographic characteristics： health behavior, quality of life, and MMSE-K. Prevalence of dementia was 9.4%(11.7% of females, 4.1% of males). Factors related to dementia, analyzed by multiple logistic regression, were age, working status, subjective health status, social support, and subjective economic status. In community health care for the elderly, factors relating to dementia have to be considered. When planning community health care, priority should be given to the elderly who： need care but live alone； lack social support； have a low standard of living； believe they are not in a good state of health； or whose life satisfaction is low.

• Journal of the Korean Society of School Health
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• v.19 no.2
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• pp.59-74
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• 2006

Purpose : The principal objective of this study was to develop adequate health promotion programs satisfying the needs of high school students by exploring a variety of factors that affected their participation in these programs. This research was also designed to serve as preliminary data for the development of health promotion programs that will encourage active student participation. Methods : The study used a descriptive correlational design. The study participants were 658 coeducational high school students in Seoul, consisting of 317 9th graders and 341 10th graders. For this study, 599 structured questionnaires were selected. The survey was conducted for the period from December 12, 2005 to December 23, 2005. Results : Overall, students surveyed in this research showed relatively active participation in health-promoting behaviors. Among 5 dimensions, interpersonal support received the highest score while health responsibility ranked the lowest. Another finding was that posture correction program enjoyed the strongest student participation (75.5%) followed by stress management program(70.1%) and weight control program (56.6%). On the other hand, the participation rates for no-drinking(12.9%), smoking cessation program(17.0%), and influenza prevention program(22.9%) were at the low end. Multiple logistic regression results indicate that the higher interpersonal support score of health promoting behaviors gets, the higher student participation becomes. Conclusion : The study demonstrated that student participation was determined by the nature of health-promoting programs, demographic characteristics and health related physical fitness. It also showed that the sub-scales of the programs played a bigger role in student participation. Keeping this in mind, a wealth of health-enhancing programs of distinguishing qualities need to be tailored to meet various needs of students. In addition, serious efforts should be made to motivate them to seek relevant health promotion programs.

• Journal of Chest Surgery
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• v.26 no.2
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• pp.141-147
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• 1993

A total of 40 patients having a diagnosis of atherosclerotic coronary arterial disease were analysed on the operative outcomes according to variables as follows: 1) preoperative risk factors such as age, sex, CCS (Canadian Cardiovascular Society) functional class, type of angina, number of diseased vessel, presence of left main coronary artery stenosis, previous history of habitual smoking and presence of other medical diseases (diabetes mellitus, essential hypertension), 2) preoperative management such as intravenous infusion of nitroglycerine, preoperative IABP (intra-aortic balloon pump) support and whether the operation was scheduled as emergency or not, 3) intraoperative variables such as infusion method and composition of cardioplegic solutions, number of distal anastomosis, use of internal mammary artery, total cardiopulmonary bypass time and total cross clamp time. Complications included operative death in 12.5％, perioperative myocardial infarction in 25.0％ and perioperative arrhythmia in 17.5％. Nineteen perioperative variables were analyzed to identify risk factors for these end points. For operative death, presence of left main coronary artery stenosis (p = 0.056) and cardiopulmonary bypass time (p = 0.029) were significant in the univariate analysis, but presence of left main coronary artery lesion (p = 0.011, $\chi$$^2$= 6.45) and abscence of preoperative of IABP support (p = 0.069, $\chi$$^2$ = 3.30) were independent predictor in multivariate analysis (stepwise linear logistic regression).

• Asian Pacific Journal of Cancer Prevention
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• v.15 no.7
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• pp.2945-2950
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• 2014

Background: This study compared risk factors for depression and suicidal ideas among cancer patients for comparison with the general population, and identified influencing factors. Materials and Methods: We analyzed data from 2,472 cancer patients in the National Cancer Center and nine Regional Cancer Centers and frequency-matched data for age and sex from 2,349 members of the general population who completed the National Health and Nutrition Examination Survey in 2008. Logistic regression analysis was used to identify factors affecting depression and suicidal ideas. Results: Cancer patients were not likely to have more depression (OR=0.96, 95%CI=0.79-1.18) and were less likely to have suicidal ideas (OR=0.64, 95%CI=0.53-0.79) compared to the general population. Female sex, more stress, and lower quality of life were influencing factors. The additional risk factors for suicidal ideas among cancer patients included income (OR=0.62, 95%CI=0.43-0.91), smoking (OR=1.63, 95% CI=1.06-2.50), recurrence (OR=1.50, 95%CI=1.15-1.95), and chemotherapy (OR=1.66, 95%CI=1.26-2.19). Conclusions: No differences appeared in depression rates between cancer patients and the general population, and cancer patients were less likely to have suicidal ideas. However, cancer patients were likely to have more risk factors than the general population, and those classified as being at high risk of suicide should receive distress management and social economic support, from early in the treatment process.