• Journal of the military operations research society of Korea
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• v.28 no.1
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• pp.1-16
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• 2002

The object of this study is to suggest the direction of building the defence logistics system of Korea Armed Forces in the future. For the purpose of this, we surveyed the best practices among the enterprises and U.S. Defence which reformed successfully the physical distribution and logistic in recent year. Also, we analyzed our current logistics system and suggested the vision, operational concept, and the way of building this system. This system is expected to reduce the total logistics cost, speed up the logistics velocity and increase the efficiency of the combat support.

• Journal of Chest Surgery
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• v.46 no.6
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• pp.444-448
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• 2013

Background: We aimed to investigate the preoperative, operative, and postoperative factors affecting intra-aortic balloon pump (IABP) insertion in patients undergoing isolated on-pump coronary artery bypass grafting (CABG). We also investigated factors affecting morbidity, mortality, and survival in patients with IABP support. Methods: Between January 2002 and December 2009, 1,657 patients underwent isolated CABG in Izmir Katip Celebi University Ataturk Training and Research Hospital. The number of patients requiring support with IABP was 134 (8.1%). Results: In a multivariate logistic regression analysis, prolonged cardiopulmonary bypass time and prolonged operation time were independent predictive factors of IABP insertion. The postoperative mortality rate was 35.8% and 1% in patients with and without IABP support, respectively (p=0.000). Postoperative renal insufficiency, prolonged ventilatory support, and postoperative atrial fibrillation were independent predictive factors of postoperative mortality in patients with IABP support. The mean follow-up time was $38.55{\pm}22.70$ months and $48.78{\pm}25.20$ months in patients with and without IABP support, respectively. The follow-up mortality rate was 3% (n=4) and 5.3% (n=78) in patients with and without IABP support, respectively. Conclusion: The patients with IABP support had a higher postoperative mortality rate and a longer length of intensive care unit and hospital stay. The mid-term survival was good for patients surviving the early postoperative period.

• Korean Journal of Occupational Health Nursing
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• v.24 no.4
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• pp.352-362
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• 2015

Purpose: The purpose of this study was to investigate the effects of job stress and support from supervisors on depression of care givers in elderly care facilities. Methods: Subjects were 191 care givers working in elderly care facilities in K-Province in Korea. Data were collected from self-administered questionnaires. Descriptive statistics, ${\chi}^2$ test, t-test, F-test, Pearson's and Spearman's correlation coefficients, and hierarchical multiple logistic regression with dummy variables were used for statistical analysis of data. Results: Job stress measured with Korean Occupational Stress Scale was $56.16{\pm}5.88$. Emotional and instrumental support from supervisors were $37.05{\pm}7.30$ and $32.39{\pm}7.34$, respectively. After controlling for general characteristics, job stress was significantly related to depression (OR: 1.07, 95% CI: 1.01~1.14). However, job stress became non-significant in the model that included instrumental support from supervisors. Not emotional but instrumental support from supervisors was significantly related to depression of care givers (OR: 0.93, 95% CI: 0.88~0.99). Conclusion: Results of this study suggest that job stress has negative effects and instrumental support from supervisors has protective effects on depression of care givers in elderly care facilities. Therefore, measures to increase instrumental support by supervisors should be developed to improve psychological health of care givers in elderly care facilities.

• Human Ecology Research
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• v.51 no.4
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• pp.425-438
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• 2013

Postponing childbirth is becoming increasingly common and consequently serious social problem in Korea, among married-working women. It is relatively unknown which factors determine married-working women's childbirth intention. This study investigated the effects of demographical factors, labor market factors and social support factors on married-working women's childbirth intention. Data from a national survey of married-working women (Korean longitudinal survey of women and families) are used in this study. The findings are as follows. First, logistic regression analyses that married-working women's childbirth intention could be predicted by 1) personal characteristic factors such as age (p <.000), education level (p<.029), parenthood (p<.000) monthly pay (p<.01); 2) husband support factors, such as satisfaction with division of household labor (p<.009), time with family (p<.049) influence of family life on work (p<.083); and 3) institutional support factors such as regular position (p<.015), regression analysis showed similar results. Personal characteristic factors and husband support factors had statistically significant effects on the number of future children. Personal value factors such as traditional family support (p<.05) proved to be the best predictor of the number of future children. Institutional support factors, on the other hand, did not have statistically significant effect on the number of future children. In a nutshell, personal characteristics and husband support proved to be the most important determinant of married-working women's childbirth intention. The findings suggest that family friendly policy and flexible labor market policy will impact married-working women's childbirth intention.

• The Journal of the Korea Contents Association
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• v.13 no.12
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• pp.829-839
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• 2013

This study is a descriptive research study with the purpose of predicting and comparing factors of depression affecting residents in a metropolitan city by using logistic regression analysis and decision-making tree analysis. The subjects for the study were 462 residents ($20{\leq}aged{\angle}65$) in a metropolitan city. This study collected data between October 7, 2011 and October 21, 2011 and analyzed them with frequency analysis, percentage, the mean and standard deviation, ${\chi}^2$-test, t-test, logistic regression analysis, roc curve, and a decision-making tree by using SPSS 18.0 program. The common predicting variables of depression in community residents were social dysfunction, perceived physical symptom, and family support. The specialty and sensitivity of logistic regression explained 93.8% and 42.5%. The receiver operating characteristic (roc) curve was used to determine an optimal model. The AUC (area under the curve) was .84. Roc curve was found to be statistically significant (p=<.001). The specialty and sensitivity of decision-making tree analysis were 98.3% and 20.8% respectively. As for the whole classification accuracy, the logistic regression explained 82.0% and the decision making tree analysis explained 80.5%. From the results of this study, it is believed that the sensitivity, the classification accuracy, and the logistics regression analysis as shown in a higher degree may be useful materials to establish a depression prediction model for the community residents.

• Journal of the Korea Institute of Military Science and Technology
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• v.3 no.1
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• pp.218-230
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• 2000

In the weapon system development/operation stage, the goals of RAM activities are to support the cost effective performance optimization in design and operation supports. In the study, the main contents are as follows; 1) To establish the operational concept and circumstance of the subsequent tank, the combat/operation scenario, the operational mode summary and mission profile for subsequent tank development are analyzed. 2) To evaluate the administrative and logistics down time for subsequent tank, the prefigured logistics circumstance and maintenance system are analyzed. 3) To calculate the RAM object values, a mathematical model for the user are developed. 4) To examinate the propriety of the RAM object values, the combat readiness are reviewed. The obtained RAM object values are provided to predict and analyze for the combat readiness, staying power, mission reliability, equipment availability and the logistic support capability.

• Journal of the Korean Home Economics Association
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• v.37 no.2
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• pp.85-98
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• 1999

The purpose of this study is to identify the preferences for care type among the elderly and to analyze contributing variables. The sample in this study are 485 elder people who are age 55 and over. The independent variables are divided into five factors according to their characteristics, and the dependent variables fall into two categories of private and public care types. The descriptive statistics and Logistic Regression method are employed for the analysis. The results can be summarized as follows. The elderly prefer individual care paid for by their own support to the other types like the care by children or institution. However, the elderly stiff like and expect family care by their children. The variables that haute affected the preferences of the care types among the elderly are whether they are employed or not, household's the amount of debt, whether they currently live with the oldest child, their level of self esteem and their degree of satisfaction in life. The results show that the elderly don't have various wants or alternatives to their care and regard public care as negative support for the financially incapable or the elderly who have no relatives.

• 한국항공운항학회:학술대회논문집
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• 2015.11a
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• pp.242-246
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• 2015

항공기 엔진 체계의 신뢰성과 안전성을 분석하는 것은 RAM 분석이라고 한다. RAM은 제작자가 개발한 시스템의 지속가능성 혹은 그 체계의 수명주기비용(Lice Cycle Cost)에 중대한 영향을 줄 수 있는 시스템 설계특성을 의미한다. 또한 RAM은 시스템이 개발될 당시에 의도된 임무를 수행할 수 있는 능력 혹은 임수수행을 성공할 수 있도록 담보하는 중요한 역할을 한다. RAM은 1970년대 이후 미국 군수분야에서는 군수지원성분석(LSA, Logistic Support Analysis) 과 밀접히 연계되어 활용되어 왔으며, RAM과 LSA를 통합하여 종합군수지원체계(ILS, Integrated Logistics Support)라고 부른다. 본 연구에서는 항공기 엔진에 대한 신뢰성 분석에 Weibull 분포를 활용하였다. Weibull 분포는 2개의 변수 적용에서 다음과 같이 정의된다. 변수가 그 계의 어떤 값을 나타내느냐에 따라 분포도 곡선의 특성 의미는 변수에 의존된다. 예를 들어 시험성적, 사회적 특성을 표현하는 인지도, 산업 제품의 고장이나 결함을 나타내는 고장관련 모수(변수) 등에 따라 그 특징을 나타내게 된다. 항공기 엔진의 신뢰성 분석을 통해 항공기 엔진의 수명 판단이 가능해졌으며 임무 불가능 수준의 In-Flight Shut-Down 비율이 현격히 감소됨을 확인할 수 있었다.

• Korean Journal of Occupational Health Nursing
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• v.18 no.2
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• pp.219-231
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• 2009

Purpose: The purpose was to investigate the relations among job stress, depression, social support, and coping strategies of nurses. Method: The data were collected from 362 nurses. A self-administered questionnaire was used to assess general characteristics, job stress, depression, social support and coping strategies. Results: The prevalence of depression was 41.7%. Scores of job demand and insecurity, and organizational climate were very high. Logistic regressions showed that nurses, who were single, their 20s, had less than a career year, or working in private hospitals, associated with an increased risk of depression. The sub-scales of job stress except interpersonal conflict and lack of autonomy contributed to an increased risk of depression (lower group; OR=0.248, 95% CI:0.14-0.43). Also individual and organizational support and control coping strategies were associated with depression(lower group: OR=2.993, 95% CI: 2.11-6.30; OR=2.993, 95% CI: 1.51-5.65; OR=2.372, 95% CI=1.43-3.93). Conclusion: These findings indicated that the job stress, especially organizational climate, insecurity of job, lack of reward, individual and organizational support, and control coping strategies contributed to a risk of depression. In order to prevent the depression, the organizational support and strategies will be needed. The depression in specific context and organizational climate should be considered in future studies.

• Journal of Digital Convergence
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• v.15 no.4
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• pp.117-125
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• 2017

The purpose of this study is to investigate the actual effect of government R&D support and regulation as a policy on technology innovation of SMEs. Because the previous studies did not consider the endogeneity of R&D support and made inconsistent conclusions in the case of regulation, the empirical research was conducted by logistic, negative binomial regression and 2SLS analysis for 1,223 SMEs. The analysis results show that government support has the effect for technology innovation even considering the endogeneity of government R&D support, and government regulation has a positive effect on technology innovation which supports Porter's theory. These results imply that government R&D support is important in inducing technology innovation because of the vulnerability of SMEs technology development environment and government should foster SMEs technology innovation through appropriate regulation policies rather than unconditional deregulation.