• Proceedings of the Korean Environmental Sciences Society Conference
• /
• 2020.10a
• /
• pp.96-96
• /
• 2020

• 한국태양에너지학회:학술대회논문집
• /
• 2012.03a
• /
• pp.419-424
• /
• 2012

This paper discusses the state-of-the-art techniques in real-time state estimation for the Smart Microgrids. The most popular method used in traditional power system state estimation is a Weighted Least Square(WLS) algorithm which is based on Maximum Likelihood(ML) estimation under the assumption of static system state being a set of deterministic variables. In this paper, we present a survey of dynamic state estimation techniques for Smart Microgrids based on Belief Propagation (BP) when the system state is a set of stochastic variables. The measurements are often too sparse to fulfill the system observability in the distribution network of microgrids. The BP algorithm calculates posterior distributions of the state variables for real-time sparse measurements. Smart Microgrids are modeled as a factor graph suitable for characterizing the linear correlations among the state variables. The state estimator performs the BP algorithm on the factor graph based the stochastic model. The factor graph model can integrate new models for solar and wind correlation. It provides the Smart Microgrids with a way of integrating the distributed renewable energy generation. Our study on Smart Microgrid state estimation can be extended to the estimation of unbalanced three phase distribution systems as well as the optimal placement of smart meters.

• Journal of Korean Tunnelling and Underground Space Association
• /
• v.3 no.4
• /
• pp.35-55
• /
• 2001

Recently, as tunnel structures are getting older and decrepit, many tunnel inspections are carried out for evaluating the tunnel state and safety. But, because there is no exact standard for tunnel state and safety, depending on subjective decision, the new standard to assess the tunnel state is required. The existing standard including mainly the assessment of the state of tunnel lining is not considered the characteristics of tunnel as underground structures. Also, the item of assessment and process of grading and classifying the state of tunnel is not objective and systemetic. In this study, new standard for assessment of tunnel state is presented for improving the problems in evaluating the tunnel state and safety. In the new standard, the new items of assessment including geotechnical condition were selected and graded, the process in classifying the tunnel state is quantitative for objective assessment for tunnel state. This new standard and method is practically used in effective safety inspection and diagnosis and tunnel maintenance.

• Korean journal of communication and information
• /
• v.57
• /
• pp.137-159
• /
• 2012

This is a dissertation about the state and cable television industry relationship during the early days of Kim Dae-Jung administration(1998.2-2000.1) in Korea. This study adopted historical approach and methodology of archival research. Offe's state theories of reproduction of late capitalism and the concept of Korean patriarchal state-led capitalism were suggested in this paper. Offe argued that the goal of the late capitalist state is successful capital accumulation and democratic legitimation with bureaucratic rationalization. For this purpose, the state intervenes market structuring by various plans and national policies. The Kim Dae-Jung administration reorganized cable television market with neo-liberalistic strategies and corporatist forms of policy-making. The government negotiated capitalists and civil society for managing capitalistic economy and cable television market in a horizontal relationship. Successful consequences of the market growth resulted in generating mass loyalty. The former administrations to the contrary, invisibly arranged state-led capitalism was an only alternative to the Kim Dae-Jung administration. The Korean state-led capitalism evolved gradually into different forms.

• Women's Health Nursing
• /
• v.11 no.3
• /
• pp.218-224
• /
• 2005

Purpose: The Purpose of this study was to investigate the relationship between state anxiety and maternal fetal attachment of unmarried mothers in a welfare center. Methods: The subjects were 25 unmarried mothers in a welfare center. The data was collected through personal interviews using a questionnaire. The instruments used for this study were the modified Spielberger's state anxiety inventory and Cranley's Maternal-Fetal Attachment Scale. Data was analyzed descriptive statistics, mean, standard deviation, t-test and the pearson correlation coefficient with the SPSS computer program. Results: The age of the subjects ranged from 15 to 25, and their average age was 20.0. The mean score of state anxiety was 58.2. There was significant difference in the degree of maternal state anxiety between the group whose pregnancy was known by their family and the group whose pregnancy was hidden. The group whose pregnancy was known showed a low state anxiety score. There was a significant difference in the degree of maternal state anxiety by the gestational period. The group who were in the second and third gestational trimester showed lower state anxiety score than in the first trimester. The mean score of maternal-fetal attachment(MFA) was 64.9. There were significant differences in the degree of maternal fetal attachment, by an ultrasound scan experience. The most frequently practiced attachment item was "I think the fetus is able to feel(mean 3.8)". Unmarried mothers degree of state anxiety showed a negative correlation with the degree of maternal fetal attachment(r=-.25), but there was no significant difference between the two variables. Conclusions: The unmarried mothers made an effort in striving to reduce their high state anxiety and to enhance maternal fetal attachment. They also realize how to take care of their state anxiety.

• Journal of the Korea Society for Simulation
• /
• v.15 no.1
• /
• pp.27-33
• /
• 2006

To guarantee QoS (Quality of Service), routers should determine routing paths satisfying service requirements, based on link state information as well as network topology. Link status database (LSD) in routers should be efficiently managed to effectively reflect the current state of all links. However, there is a trade off between the exact reflection of the current link status and its update cost. For exactly reflecting the current link status, each router immediately notifies its neighbors that link state information is changed. This may degrade performance of the router due to the processing of link state update messages. On the other side, if the current link state information is not updated appropriately, a route setup request can be rejected because of the discrepancy between the current link state information and previously updated link state information in LSD. In this paper, we propose a traffic variation based link state update algorithm for adaptively controlling the generation of link state update messages and compare its performance with those of four existing algorithms by intensive simulations.

• Korean Journal of Social Welfare
• /
• v.40
• /
• pp.191-225
• /
• 2000

The purpose of this study is to formulate the way of the feminist strategy in Germany which is to change in the process of the globalization in the economic relations. The radical feminism which is the main streaming of german feminism shows a little interest in the role of the german welfare state (social state) to improve the quality of life of women. The german welfare state is, as the feminism says, only a instrument of patriarchy to perpetuate the domination of men over women. The german welfare state has played, but, an important role for the individualization of the relation of women's life which is the first condition for the emancipation of women from the patriarchal domination. That is a result of the interaction between the german welfare state and feminism. The role of the german welfare state for the interest of women is now challenged by the globalization of the economic relations which tries to reduce the standard of social services. The greatest victim of this process is women. Therefore it is necessary for the german feminism to think over the way of his strategy in relation to the german welfare state. The content of this study is as follows: First, the historical background of the german feminism explains how the radical feminism has become the mainstreaming of the german feminism. Seconds, the feminist strategy which rejects the role of the german welfare state for the interest of women has its own limits. Third, the german welfare state has not only developed the ideology of breadwinner but also contributed to the beginning of independent life of woman who were under the control of man. Fourth, the german welfare state is challenged by the economic globalization and being changed by the economic globalization. Fifth, therefore, the feminism has to concentrate to develop a strategy which accepts the limit and the possibility of german welfare state.

• Journal of Korea Multimedia Society
• /
• v.16 no.1
• /
• pp.75-86
• /
• 2013

This paper presents a technique to implement embedded systems using interrupts of the one-chip microcontroller with many peripherals based on a multiple finite state machines model. The multiple finite state machine model utilizes the structure of FSMD used for hardware design and the features of flow control by interrupts. The main finite state machine corresponds to the main program and the sub-state machines corresponds to the interrupt subroutines. Therefore, interrupts from the peripherals can be processed immediately in the sub-state machines. The request and reply variables are used to interface between the finite state machines. Additional operating system is not necessary for the context switching between the main state machine and the sub-state machine, because the flow-control caused by interrupt can be replaced with the switching. An embedded system modeled on multiple finite state machine with ASM charts can be easily implemented by the conversion of ASM charts into C-language programs. This implementation technique can be easily adopted to the hardware oriented embedded systems because of the detail description of the model and the fast response to the interrupt events in the sub-state machine.

• ALGAE
• /
• v.37 no.3
• /
• pp.227-237
• /
• 2022

Knowledge on the seaweeds of eastern Sorsogon in the Philippines is uneven. Not only is eastern Sorsogon among the areas of high seaweed diversity but locals there have interacted with seaweeds for ages. Despite seaweeds' assumed importance to Sorsoganon, ethnobotanical records are missing. In this study, we documented the traditional knowledge on seaweed use and determined the rate of knowledge transmission among the locals of eastern Sorsogon. Vernacular names and modes of preparation were given of the 12 identified species bearing culinary and medicinal importance. Ten species were eaten while three were used therapeutically. Based on ethnobotanical indices, Caulerpa chemnitzia ecad turbinata and Gelidiella acerosa were the most important seaweeds. The least cited was Caulerpa racemosa. Our study demonstrated that most of the seaweed resources in eastern Sorsogon remain largely untapped, as the identified ethnotaxa were only about 5% of the total seaweed species diversity reported for the area. The seaweed knowledge in eastern Sorsogon appeared to be homogenous across age groups with primary sources of knowledge biased towards female relatives (mothers and grandmothers) and to children as inheritors. Cessation of seaweed knowledge may come at a potential cost, as a significant fraction of the population did not transmit their knowledge to others. Our study furthered the interest in providing sophisticated resource management recommendations that consider the relationships of traditional and scientific knowledge of seaweed selection and use in eastern Sorsogon and beyond.

• The Journal of Asian Finance, Economics and Business
• /
• v.6 no.3
• /
• pp.81-89
• /
• 2019

Many authors have examined the impact of public spending on economic growth. This study uses ordinary least-squares technique to test the effect of state budget expenditure with two major components: development investment expenditure and recurrent expenditure on Vietnamese economy for the period 2000-2017. The empirical results show that the state budget expenditure of Vietnam has positive effect on the economy, however each main component has different impacts. Recurrent expenditure has significant positive impact on Vietnamese economy while there has no evidence to affirm the relationship between the development investment expenditure and the economic growth. Vietnamese government should restructure the state budget to enhance the positive effect on the economy. In the short run, Vietnam should not increase development investment expenditure due to low efficency in public investment. In the long run, it is necessary to economize recurrent expenditure to reserve a reasonable proportion of state budget for development investment expenditure to build infrastructure for developing the economy. The state budget expenditure should be restructured towards prioritizing recurrent expenditure on human and social relief, reducing public administration expenditure, allocating investment capital from the state budget for key and pervasive projects, avoiding spreading out investments as well as crowding out private investments.