• Nuclear Engineering and Technology
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• v.52 no.11
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• pp.2415-2421
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• 2020

The axial heterogeneous void distribution in a fuel channel is a relevant and important issue during nuclear reactor analysis for LWR, especially for boiling water channel-type reactors. Variation of the coolant density in fuel channel has an effect on the neutron spectrum that will in turn have an impact on the values of absolute reactivity, the void reactivity coefficient, and the fuel isotopic compositions during irradiation. This effect is referring to as the history effect in light water reactor calculations. As the void reactivity effect is positive in RBMK type reactors, the underestimation of water density heterogeneity in 3D reactor core numerical calculations could cause an uncertainty during assessment of safe operation of nuclear reactor. Thus, this issue is analysed with different cross-section libraries which were generated with WIMS8 code at different reference water densities. The libraries were applied in single fuel model of the nodal code of QUABOX-CUBBOX/HYCA. The thermohydraulic part of HYCA allowed to simulate axial water distribution along fuel assembly model and to estimate water density history effect for RBMK type fuel.

• The Journal of Industrial Distribution & Business
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• v.8 no.4
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• pp.7-13
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• 2017

Purpose - This study aims to determine whether history education for Korean-Chinese living in Korea affects their understanding for Korean society. It also aims to determine Korean-Chinese compatriots to recognize the necessity for History education. Research design, data, and methodology - In this study, two parts were examined, which were the analysis on the influence of history education and the Korean-Chinese compatriots' adaptation to Korean society. In the case of data survey, Korean-Chinese compatriots were selected who are living in Korea. The survey was conducted using the samples of 200 questionnaires in total. Results - The results of the analysis shows that their residence adaptation in Korea has a positive impact on future nationality. Moreover, the residence adaptation in Korea has positive implications for their future nationality and their longer residence duration in Korea has an effect on their hope for living in Korea. Conclusions - The study showed the historical consciousness and related demographic characteristics of Korean compatriots living in Korea. It also showed that the longer their education duration for Korean history in China, the more difficult their adaptation would be. Therefore, the long term effects of adaptation depended on the emphasis of Korean history.

• Women's Health Nursing
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• v.11 no.1
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• pp.46-51
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• 2005

Purpose: The aim of this study was to identify risk factors for breast cancer and early screening behavior in women in the community. Method: The participants were 125 women residing in W city. Data was collected using an instrument developed by the researchers. Analysis was done using descriptive statistics, and the $x^2$ test. Result: For risk based on the Gail Model, age (above 50 years) had a distribution of 24.8%, first degree family history, 4.9%, age at first full term pregnancy, 13.8%, and benign breast cancer history, 4.9%. For risk based on other common risk factors, menopause had a distribution of 20.7%, did not breast feed, 15.4%, history of HRT, 7.3%, meat preference, 35.0%, and history of smoking or drinking, 2.4% and 43.5%, respectively. There was a significant difference in BSE and mammography screening behavior ($x^2=22.5$, p<.00), but no difference in distribution of risk factors and screening behavior. Conclusion: For effective prevention of breast cancer, it is necessary to develop an instrument for risk assessment and, through assessment, select women at high risk. It is also necessary to provide education and appropriate recommendations on screening behavior.

• Journal of architectural history
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• v.26 no.3
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• pp.31-38
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• 2017

The retail store, which appears in various ways of the modern city, is the architectural result that the merchandise is finally delivered to consumers. The relationship between the commerce based on manufacturing and distribution and the retail store as urban architecture can be understood not only from the viewpoint of economics and business administration but also the problem of the formation of urban history and urban organization. The modern industrial development in Korea had been progressed by the state led, as the manufacturing and distribution developed in turn. This social and economic situation influenced the formation of the retail store of the city. This is different from the West, which the development has been conducted together. The cosmetics sales space, which is the subject of this study, has changed in various forms from the 1960s to the 1990s. Cosmetics brand retail shop is a corporate brand-based space, but paradoxically, it has a historical characteristic of urban architecture in that it is branding city street. This specificity of Seoul is unexplained by the development process of the Western and does not exist as a physically huge or special construction sometimes. However, it operates as a urban architecture in Seoul where the complicated.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.10
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• pp.159-165
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• 2020

The demand for food safety has emerged as a major social issue due to changes in diet patterns and consumers' perceptions, along with the advancements in society and the development of the food industry. Consumers are demanding more information about the food they consume, and are sensitive to food scandals. With such interest in food safety, blockchain technology is attracting attention as a means of effectively responding to poor food management resulting in food fraud or unsafe distribution. By ensuring the accuracy of, and trust in, traceability in the food supply chain, it is possible to build trust between traders and to ensure safe food distribution. This paper proposes a next-generation agri-food distribution system that can provide and manage (for suppliers, consumers, and distribution officials) a variety of agri-food information, such as the history, distribution, safety, quality, and freshness of food. Information on product status and distribution status in all processes, including production, processing, distribution, sales, and consumption, can be monitored and controlled in real time (anytime, anywhere), and users can check the safety level of each type of food in real time through an app.

• Journal of applied mathematics & informatics
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• v.12 no.1_2
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• pp.323-334
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• 2003

We review the developmental history of the moment matrix of matrix quadratic form. This paper also investigates, the moment matrix of (non-central) Wishart distribution, which is multi-version of X$^2$ distribution.

• Journal for History of Mathematics
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• v.12 no.1
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• pp.1-12
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• 1999

The first part of this thesis discusses the types and the properties of errors, one of which makes up systematic errors of measurements, removable by detecting their causes, the other errors of accidental causes which can not be removed. The final part of this thesis deals with the historical background of the Gaussian distribution by Hershel, Hagen, Laplace and Gauss from the late 18th century to the early 19th century. It can be concluded that the accidental idea and the treatment of accidental error distribution by Gauss Is the best one based on the assumption that the most probable value of true value is the arithmetic mean of data, obtained by repeated measurements of a given quantity.

• Journal of architectural history
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• v.5 no.1 s.9
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• pp.39-49
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• 1996

Accoring to many studies which concerned with the types of folk houses, there are many types of folk houses in Korean peninsula and its areal distribution had been determined by the barrier of mountains, in general. But we have neglected to examine the overlapped areal distribution still now. If two types of culture with different housing type contact at one region, it may interrelated each other and invent certain exclusive charicteristics. And there are its own attitude of traditional culture in Kyung-buk provingce where serveral types of folk houses settled together. The purpose of this research is to clarify the general pattern of culture in terms of folk houses in northern Kyung-buk province and to suggest a clue to solve the cultural inter-relationship each other, By classification of the collected plans in this area, the authors try to find out the charicteristics of the serveral types and there areal distribution. Finally, we can find out that certain types of folk houses located in northern Kyung-buk province had formed their cultural regions and these homogeneous regions are overlapped, partly.

• Earthquakes and Structures
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• v.11 no.3
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• pp.407-420
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• 2016

The aim of this study is to investigate the effect of vertical ground motion (VGM) on seismic behavior of reinforced concrete (RC) regular frame with construction joints, and determine more proper modeling method for cast-in-situ RC frame. The four-story RC frames in the regions of 7, 8 and 9 earthquake intensity were analyzed with nonlinear dynamic time-history method. Two different methods of ground motion input, horizontal ground motion (HGM) input only, VGM and HGM input simultaneously were performed. Seismic responses in terms of the maximum vertex displacement, the maximum inter-story drift distribution and the plastic hinge distribution were analyzed. The results show that VGM might increase or decrease the horizontal maximum vertex displacement depending on the value of axial load ratio of column. And it will increase the maximum inter-story drift and change its distribution. Finally, proper modeling method is proposed according to the distribution of plastic hinges, which is in well agreement with the actual earthquake damage.

• Structural Engineering and Mechanics
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• v.85 no.1
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• pp.55-64
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• 2023

Energy-based seismic design and evaluation methods are promising to be involved in the next generation design codes. Accordingly, determining the distribution of earthquake input energy demand among floor levels is quite imperative in order to develop an energy-based seismic design procedure. In this paper, peak floor input energy demands are achieved from relative input energy response histories of several reinforced concrete (RC) frames. A set of 22 horizontal acceleration histories selected from recorded near-fault earthquakes and scaled in time domain to be compatible with the elastic acceleration design spectra of Turkish Seismic Design Code are used in time history analyses. The distribution of the computed input energy per mass values and the arithmetic means through the height of the considered RC frames are presented as a result. It is found that spatial distribution of input energy per mass is highly affected by the number of stories. Very practical yet consistent formulation of distributing the total input energy to story levels is achieved, as a most important contribution of the study.