• Journal of Power Electronics
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• v.13 no.4
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• pp.507-515
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• 2013

This paper presents an isolated bidirectional dc/dc converter based on primary parallel isolated boost converter (PPIBC). This topology is an efficient solution in low voltage high power applications due to its ability to handle high currents in the low voltage side. In this paper, the converter has been modeled using non-ideal components and operated without any additional circuitry for startup using a digital soft-start procedure. Simulated and measured loop gains have been compared for the validity of the model. On-the-fly current direction change has been achieved with a prototype interconnecting two battery banks. A second prototype has been constructed and tested for supercapacitor operation in constant power charge mode.

• Geomechanics and Engineering
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• v.8 no.2
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• pp.257-282
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• 2015

In this study, the authors present a coupled fluid-structures-seabed interaction analysis of a monopile type of wind turbine foundations in liquefiable soils. A two dimensional analysis is performed with a nonlinear stiffness degradation model incorporated in the finite difference program Fast Lagrangian Analysis of Continua (FLAC), which captured the fundamental mechanisms of the monopiles in saturated granular soil. The effects of inertia and the kinematic flow of soil are investigated separately, to highlight the importance of considering the combined effect of these phenomena on the seismic design of offshore monopiles. Different seismic loads, such as those experienced in the Kobe, Santa Cruz, Loma Prieta, Kocaeli, and Morgan Hill earthquakes, are analyzed. The pore water pressure development, relative displacements, soil skeleton deformation and monopile bending moment are obtained for different predominant frequencies and peak accelerations. The findings are verified with results in the liter.

• 한국전산유체공학회:학술대회논문집
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• 2009.04a
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• pp.368-376
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• 2009

Studies on the effect of the wall-ion, wall-water, water-ion and ion-ion interaction on properties of water and ions in nano-channels have been performed through the use of different kinds of ions or different models of potential energy between wall-ion or wall-water. On this paper, we address the effect of water-wall interaction potential on the properties of confined aqueous solution by using the molecular dynamics (MD) simulations. As the interaction potential energies between water and wall we employed the models of the Weeks-Chandler-Andersen (WCA) and Lennard-Jones (LJ). On the MD simulations, 680 water molecules and 20 ions are included between uniformly charged plates that are separated by 2.6 nm. The water molecules are modeled by using the rigid SPC/E model (simple point charge/Extended) and the ions by the charged Lennard-Jones particle model. We compared the results obtained by using WCA potential with those by LJ potential. We also compared the results (e.g. ion density and electro-static potential distributions) in each of the above cases with those provided by solving the Poisson-Boltzmann equation.

• Health Policy and Management
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• v.21 no.4
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• pp.599-616
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• 2011

This research was performed to investigate the determination factors of medical service to cover the fee for selecting a doctor which is one of the most important causes of debilitating national health insurance in Korea. Data was from Korea Health Panel and analyzed by Dutton(1986)'s medical service model which was an extended Anderson Model and was widely used in the researches on determination factors of medical service. The results were as follows; In the determinants of selecting a doctor in specialized medical institutions and general hospitals, patients with serious diseases selected doctors more often than other patients. By industrial accident compensation insurance law and enforcement ordinances, insurance covers the fee of selecting a doctor in the hospitals appointed by Labor Welfare Corporation for the patients in critical conditions under industrial accident compensation insurance, while health insurance patients pay the fee themselves for selecting a doctor in all cases. It is suggested that patients with serious diseases proved by medical opinion be provided with health care insurance in selecting a doctor and that the health insurance benefit coverage be enhanced by staged lowering of patient's cost-sharing.

• STI Policy Review
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• v.8 no.2
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• pp.49-74
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• 2017

What are some of the explanations for cross-national diversity of foresight performance among technological followers? Why are some countries more successful than others in learning how to develop national innovation system foresight? This paper argues that the answers are linked to organizational capacities at three different levels: governmental, policy network and social learning. To corroborate this argument, the paper chose Iran and Korea as benchmarking partners, and attempts to find out what makes Iran a slow learner in building innovation system foresight. The conceptual model is an improved model of Saritas's, by integrating Borras' and Andersen's conceptions and classifications. The data are collected from comprehensive interviews in both countries and second-hand data of international indexes. The paper, finally, concludes that it is the weakness of analytical-systemic capacity that impedes and delays the emergence of systemic foresight in Iran, and that this weakness stems from the adverse impacts of the dominant institutions, surrounding the innovation system. The final point is that it is not sufficient for Iran to learn the methods and techniques of foresight from Korea. It should learn how to open its macro-policy towards the global market and design appropriate industrial strategy in a coherent policy-strategy portfolio.

• The Journal of the Korea Contents Association
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• v.16 no.6
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• pp.334-344
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• 2016

The purpose of this research is to investigate usage related predictors to activate Adult Guardianship System of People with Developmental Disabilities. To achieve the purpose of this research, we have analyzed the survey of parents of People with Developmental Disabilities usage needs for Adult Guardianship System which is based on the Andersen's behavioral model. The study utilized data from 2011 Welfare Needs Assessment of Seoul middle and senior-aged Family with Developmental Disabilities, and the analysis method, the study applied used SPSS 22.0, frequency analysis, descriptive statistics analysis, logistic regression analysis. According to the result, the usage needs for Adult Guardianship System increases meaningfully if the parents does not have occupation, and the subject of Adult Guardianship System is male. In income and the social security system wise, the usage needs for Adult Guardianship System show remarkably large rating if the average income is high and the desire to be cared by others is high. But in case of People with Developmental Disabilities, communication skills, the degree of disability, burden of caring does not have effect on the usage needs for Adult Guardianship System. The conclusion for this research is, first, to activate vigorous usage of Adult Guardianship System, the government intervention is required. Second, the following study is needed to explain to the concept of the needs caring by others and the cultural factors relating to the usage needs for Adult Guardianship System.

• Korean Journal of Social Welfare
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• v.60 no.3
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• pp.275-297
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• 2008

The purpose of this study is to analyse economic preparations for aging of the middle and old-aged and their determinants empirically, and then to discuss the findings and implications for the results of analysis. Data from The Social Statistics Survey conducted by Korea National Statistical Office are used in this study. From this dataset, 18,354 Middle and Old Citizens aged between 45 and 59 were selected for this study. The Conceptual framework for this study was based on Andersen's behavioral model and logistic model was used to investigate factors that affect economic preparation for aging. The results of this study can be summarized as follows. First, Proportion of middle and old citizen with no economic preparation for aging was high, and old-aged had lower level of economic preparation for aging than relative less aged. Second, male, education level, marital status, economic activities, recognition of present income, housing ownership, residental location, and total life condition improvement is positively and statistically significantly associated with economic preparations for aging. Third, while male, age, and economic activities is negatively and statistically significantly associated with private economic preparations for aging, education level, recognition of present income, and total life condition improvement is positively and statistically significantly associated with private economic preparations for aging. Fourth, while male, education level, marital status, economic activities, recognition of present income, housing ownership, residental location, and total life condition improvement, expectation of future income is positively and statistically significantly associated with secondary economic preparations for aging, age is negatively and statistically significantly associated with secondary economic preparations for aging.

• 한국노년학
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• v.40 no.4
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• pp.707-727
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• 2020

This study aims to empirically analyze the role that perception of the probability of lonely death among the elderly people living alone plays in the relationship between perceived social support and preference for institutional care based on Andersen's expanded Behavioral Model (2002). The subjects (n=676) of this study were the elderly people living alone, extracted from the "2018 Seoul Aging Survey." With "perceived social support" as an independent variable, "preference for institutional care" as a dependent variable, and "perception of the probability of lonely death" as a mediator variable, we conducted a Binary Logistic Regression to follow the three steps of analyzing mediation effect, as suggested by Baron and Kenny (1986). The results showed that perceived social support has a negative effect on the preference for institutional care and perception of the probability of lonely death among the elderly people living alone; at the same time, perception of the probability of lonely death was found to have a positive effect on their preference for institutional care. Lastly, perception of the probability of lonely death was found to partially mediate the effect of perceived social support among the elderly people living alone in terms of their preference for institutional care. Based on these findings, the practical implications of this study can be summarized as follows. First, various programs and support should be provided to the elderly people living alone in order to enhance the level of perceived social support, a factor that has been confirmed to increase preference for institutional care among the elderly people living alone. Second, as the perception of the probability of lonely death was confirmed to be a psychosocial factor of the preference for institutional care, we need to promote education and support for older people living alone to prepare them for lonely death. These efforts are expected to form a foundations for implementing a community-based integrated care system, "Aging in Place," which is the policy direction required for older people care.

• Korean Journal of Social Welfare
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• v.69 no.3
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• pp.165-191
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• 2017

The purpose of this study is to identify the major predictive factors of intention of drug users to use treatment services. The theoretical framework was used extended Behavioral Model of Health Services Use which integrates the Andersen model and the Theory of Planned Behavior. Thus, this study examined the effects of individual characteristics(predisposing, enabling, need factor) and attitude, subjective norm, perceived behavior control on drug users' intention to use treatment services. Factors with a statistically significant effect were as follows: from the individual characteristics - gender and past treatment experiences of the predisposing factors along with psychiatric diagnosis, anxiety and depression, and severity of drug abuse of need factors. From the Theory of Planned Behavior - subjective norm and perceived behavior control turned out to have impacts on their intention to use treatment services. The study emphasizes that a concern of women, increasing positive experiences of treatment, efforts to change the subjective norms and perceived behavior control of drug users to promote their determination to get treatment.

• Research in Community and Public Health Nursing
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• v.29 no.1
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• pp.41-53
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• 2018

Purpose: This study was conducted to identify the factors affecting on unmet healthcare needs of married immigrant women, especially who are working in South Korea. Methods: It is designed as a cross-sectional descriptive study. We analyzed data from 8,142 working married immigrant women to the 'National Survey of Multicultural Families 2015.' Based on Andersen's health behavior model, logistic regression was conducted to determine the predictors of unmet healthcare need. Results: The prevalence of unmet healthcare needs among the subjects was 11.6%. In multivariate analysis, significant predictors of unmet needs included existence of preschooler, country of origin, period of residence in predisposing factors, monthly household income, helpful social relationship, social discrimination, Korean proficiency, working hour per week in enabling factors, and self-rated health, experience of grief or desperation in need factors. Conclusion: The association between labor-related factors and unmet healthcare needs of marriage immigrant women currently working was found from nationally representative sample. Support policies for immigrant women working more than legally defined hours and having preschooler should be supplemented to reduce unmet healthcare needs. In addition, eradicating discrimination in workplace, enlarging social relationship, and developing culturally competent nursing services tailored to health problems caused by labor are needed.