• Journal of applied mathematics & informatics
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• v.16 no.1_2
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• pp.585-593
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• 2004

In this paper we shall discuss the minimal, maximal and primary subautomata. Also the concepts of the totally reachable state and source will be introduced. It is an interesting part that mX＊ is minimal iff the source S(m) is maximal. We shall point out that the characterization of primary subautomaton comes from the properties associated with the sources S(m)'s.

• The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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• v.22 no.3
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• pp.135-149
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• 2017

Microplastics are fractions of plastics less than 5 mm in size and can be divided into artificially manufactured primary microplastics and physically or chemically decomposed secondary microplastics. In this study, the emission source of microplastics made by the human activities is defined as the primary source of microplastics. And the primary sources of microplastics were summarized by using the literature and the emission potential of each source was estimated. As a result, this study showed that 63,000 to 216,000 ton/year of microplastics were discharged into the environment. Among primary sources, transport, tyre dust, and laundry were the major primary sources.

• Korean journal of communication and information
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• v.39
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• pp.140-177
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• 2007

The purposes of this study are to analyze how the media reflects the source competition between the activist group and the governmental source in the news contents. Media ideology and the conflict phase also were chosen as situational variables for evaluating how those variables could influence the source competition process. To answer the proposed research questions, the study chose the 'screen quota' issue as a research unit and analyzed documents from three sources, media news, the activist group for maintaining screen quota, and the governmental source during six years and three months. The results showed that the government source played a primary definer role in media reporting related to the screen quota issue, compared to the activist group. The governmental source's primary definer role was maintained against the highly contested social issue while the media ideology, to some degree, leveraged the activist group's comparatively unstable primary definer power. The governmental source's primary definer role was escalated as the conflict phase evolved.

• Archives of Pharmacal Research
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• v.16 no.2
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• pp.152-154
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• 1993

By using N-bromophthalimide (NBP) as halonium ion source for the Hofmann rearrangement, a series of primary amide could be ocnverted to the corresponding cabamate in excellent yields. So NBP was throught to be very effective and practical halonium ion source for the Hofmann rearrangement.

• Health Policy and Management
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• v.32 no.1
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• pp.29-44
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• 2022

Background: This study was conducted to analyze the impact of having a usual source of care on health behaviors of the middle aged and the elderly, in order to investigate the potential effect of enhancing primary health care in a Korean context. Methods: This study constructed a balanced panel of middle-aged and elderly samples using the Korea Health Panel 2016-2018, and fixed-effect models were used to analyze the data. Results: Among three sets of dependent variables (physical activity, smoking, drinking), statistically significant results were found only in physical activity. Subgroup analysis showed that this effect was not observed in the late elderly (aged 75 and older) and those without chronic diseases. Conclusion: Results of the study implied that enhancing primary health care among middle age and the elderly may have an effect on improving health behaviors. Moving forward to person-centered primary health care from disease-focused primary health care should be considered in high-risk groups such as the middle aged and the elderly with chronic diseases.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.40 no.3
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• pp.250-257
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• 1991

In the analysis of the electric machine by finite element method, the primary current has been selected as a driving source. But the voltage is constant and the primary current varies according to the load condition in the pracdtical system. Therefore, in this paper, magnetic flux distribution, primary current, input effective power, power factor, efficiency and propulsion force of S.L.I.M. were calculated by the finite element method cnsidering the voltage as a driving source. Because the driving characteristics could not be measured in the S.L.I.M., voltage-current curve, 3-phase current curve, and propulsion force were measured at the starting and they were compared with theoretical values.

• The Korean Journal of Emergency Medical Services
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• v.21 no.3
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• pp.97-107
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• 2017

Purpose: The purpose of the study was to investigate and compare the usual source of healthcare and frequent visits to emergency departments. Methods: The study subjects were 7,252 individuals with chronic diseases who filled out the questionnaire of the 2013 Korea Health Panel Survey. Data were analyzed using chi-square test and logistic regression. Results: Compared to having a public health center or clinic as a usual source of healthcare, it is 1.341 times more likely for a chronic disease patient to visit an emergency department if the hospital is her/his usual source of healthcare, while it is 1.656 times more likely for the patient to visit a general/tertiary hospital. Conclusion: It is important to investigate visits at the emergency department requiring primary care for diseases.

• Journal of Electrical Engineering and Technology
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• v.13 no.2
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• pp.677-687
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• 2018

This paper presents a novel power decoupling control scheme with the bidirectional buck-boost converter for primary-side regulation photovoltaic (PV) micro-inverter. With the proposed power decoupling control scheme, small-capacitance film capacitors are used to overcome the life-span and reliability limitations of the large-capacitance electrolytic capacitors. Then, an improved flyback PV inverter is employed in continuous conduction mode with primary-side regulation for the PV power conditioning. The proposed power-decoupling controller shares the reference for primary side current regulation of the flyback PV inverter. The decoupling controller shapes the input current of the bidirectional buck-boost converter. The shared reference eliminates the phase-delay between the input current to the bidirectional buck-boost converter and the double frequency current at the PV primary current. The elimination of the phase-delay in dynamic response enhances the ripple rejection capability of the power decoupling buck-boost converter even with small film capacitor. With proposed power decoupling control scheme, the additional advantage of the primary-side regulation of flyback PV inverter is that there is no need to have an extra current sensor for obtaining the ripplecurrent reference of the decoupling current-controller of the power-decoupling buck-boost converter. Therefore, the proposed power decoupling control scheme is cost-effective as well as the size benefit. A new transient analysis is carried out which includes the source voltage dynamics instead of considering the source voltage as a pure voltage source. For verification of the proposed control scheme, simulation and experimental results are presented.

• Journal of Communications and Networks
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• v.14 no.2
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• pp.162-168
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• 2012

This paper considers the scenario in which a set of nodes share a common channel. Some nodes have a rechargeable battery and the others are plugged to a reliable power supply and, thus, have no energy limitations. We consider two source-destination pairs and apply the concept of cognitive radio communication in sharing the common channel. Specifically, we give high-priority to the energy-constrained source-destination pair, i.e., primary pair, and low-priority to the pair which is free from such constraint, i.e., secondary pair. In contrast to the traditional notion of cognitive radio, in which the secondary transmitter is required to relinquish the channel as soon as the primary is detected, the secondary transmitter not only utilizes the idle slots of primary pair but also transmits along with the primary transmitter with probability p. This is possible because we consider the general multi-packet reception model. Given the requirement on the primary pair's throughput, the probability p is chosen to maximize the secondary pair's throughput. To this end, we obtain two-dimensional maximum stable throughput region which describes the theoretical limit on rates that we can push into the network while maintaining the queues in the network to be stable. The result is obtained for both cases in which the capacity of the battery at the primary node is infinite and also finite.

• The Journal of Small Business Innovation
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• v.19 no.2
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• pp.1-15
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• 2016

Entrepreneurs usually require financing for starting their businesses. Their primary source may be personal savings, family and friends' funds, or loans from banks and other financial institutions. Immigrant and native entrepreneurs may differ in their sources of financing, and their differences in sources may depend on their societal context. The research questions are, how does an entrepreneur's migration status -immigrant versus native-influence primary source of financing, and how is this influence moderated by wealth of the country? Data are a sample of 14,369 immigrant and native owner-managers of starting businesses in 29 countries, surveyed in the Global Entrepreneurship Monitor, and analyzed by hierarchical mixed models. Analyses reveal that immigrant and native entrepreneurs similarly frequently have their personal savings and family as the primary source of funding. Native entrepreneurs, more often than immigrant entrepreneurs, have banks and other financial institutions as the primary source of funding. Immigrants, more often than native entrepreneurs, have friends and yet other sources as the primary source of funding. These effects of migration status upon source of financing, however, are moderated by the national context, in that wealth of the country boosts the immigrants' use of friends and other sources of financing.