• Nuclear Engineering and Technology
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• 제55권7호
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• pp.2556-2566
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• 2023

A first-principle approach within the framework of density functional theory was employed to study the effect of vacancy defects and fission products (FPs) doping on the mechanical, electronic, and thermodynamic properties of uranium monocarbide (UC). Firstly, the calculated vacancy formation energies confirm that the C vacancy is more stable than the U vacancy. The solution energies indicate that FPs prefer to occupying in U site rather than in C site. Zr, Mo, Th, and Pu atoms tend to directly replace U atom and dissolve into the UC lattice. Besides, the results of the mechanical properties show that U vacancy reduces the compressive and deformation resistance of UC while C vacancy has little effect. The doping of all FPs except He has a repairing effect on the mechanical properties of U_1-xC. In addition, significant modifications are observed in the phonon dispersion curves and partial phonon density of states (PhDOS) of UC_1-x, Zr_xU_1-xC, Mo_xU_1-xC, and Rh_xU_1-xC, including narrow frequency gaps and overlapping phonon modes, which increase the phonon scattering and lead to deterioration of thermal expansion coefficient (α_V) and heat capacity (C_p) of UC predicted by the quasi harmonic approximation (QHA) method.

• 디자인학연구
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• 제17권3호
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• pp.393-402
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• 2004

프뢰벨이 1837에 창안한 은물(Gifts)은 유아교구에서 구체적이고 체계적인 놀이감을 이용한 최초의 교수매체였다. 프뢰벨이 은물의 형태에서 제시하고 있는 육면체, 원기둥, 구의 형태와 점선면의 개념, 그리고 6개 색채 등의 조형적 개념은 근대디자인에서 시각적 조형요소의 기초를 이루게 된다. 그러나 프뢰벨 유아교육사상을 현실적으로 교육현장에 적용하기 위하여 제시된 교육적 놀이감인 은물교구에 대한 디자인적 고찰과 분석은 거의 이루어지고 있지 않은 실정이다. 본 연구에서는 프뢰벨 은물에 대한 시각적 조형성을 분석하여 봄으로써 프뢰벨 교육사상이 은물의 조형적인 형태생성에 끼친 구조적 원리를 고찰하고자 한다. 따라서 은물이 가지고 있는 조형원리에 대한 분석을 통하여 추상적이고 철학적인 사상체계가 시각적으로 어떻게 형태에 적용되었는지를 연구하였다. 본 연구는 은물교구에서 제시되고 있는 조형성에 대한 탐색적 고찰로서, 기하조형에 대한 형태생성원리의 연구이며, 그에 대한 영향력과 유아교구의 조형성에 대한 문제점을 디자인적 시각에서 분석하여 본 것이다.

• International Journal of Internet, Broadcasting and Communication
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• 제16권1호
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• pp.203-214
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• 2024

This study seeks to provide implications for domestic-related policies through exploratory analysis research to support AI-based policy decision-making. The following should be considered when establishing an AI-based decision-making model in Korea. First, we need to understand the impact that the use of AI will have on policy and the service sector. The positive and negative impacts of AI use need to be better understood, guided by a public value perspective, and take into account the existence of different levels of governance and interests across public policy and service sectors. Second, reliability is essential for implementing innovative AI systems. In most organizations today, comprehensive AI model frameworks to enable and operationalize trust, accountability, and transparency are often insufficient or absent, with limited access to effective guidance, key practices, or government regulations. Third, the AI system is accountable. The OECD AI Principles set out five value-based principles for responsible management of trustworthy AI: inclusive growth, sustainable development and wellbeing, human-centered values and fairness values and fairness, transparency and explainability, robustness, security and safety, and accountability. Based on this, we need to build an AI-based decision-making system in Korea, and efforts should be made to build a system that can support policies by reflecting this. The limiting factor of this study is that it is an exploratory study of existing research data, and we would like to suggest future research plans by collecting opinions from experts in related fields. The expected effect of this study is analytical research on artificial intelligence-based decision-making systems, which will contribute to policy establishment and research in related fields.

• 한국실내디자인학회논문집
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• 제15권4호
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• pp.106-114
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• 2006

The purposes of natural science museums are to educate the general public on the principles and application of science, and help them understand various aspects of science technology. Data should be analyzed by considering these educational aspects of exhibition, and the methods of presenting exhibits should be decided. Accordingly, the composition of exhibition contents with various exhibition elements has an important role at natural science museums. The relation and structure of exhibition themes are significant factors in helping visitors understand the principles of science and a system of viewing circulation can be used as an important tool for understanding the flow of exhibition. In other words, at the planning stage for the composition of exhibition contents, the relation of exhibition themes as well as the circulation patterns of viewers can induce active viewing behaviors. Therefore, centering on the patterns of viewing circulation as well as on the connectivity of exhibition themes at natural science museums, the purposes of this research are: 1) to conceptualize the composition of exhibition contents; and 2) to find elements that can induce active viewing behaviors by analyzing visitors' viewing behaviors. This research was establishing an analytical indicator of contact for viewing behaviors observed from the composition of exhibition scenarios, the active viewing patterns of engagement, first contact, and repeated contact were analyzed. First, a composition pattern with a high participation rate, in contact with exhibits, was found to induce an overall-viewing circulation and have a big ring of the composition of exhibition themes. Second, by inducing a partial-viewing circulation pattern, a high rate of first contacts was observed from a ring pattern of theme connection. Even for the structure with theme connection with depth, a high frequency of contacts with various exhibits was found when exhibition themes have a ring pattern. Third, the repeated contacts were mostly found in the form of scenarios, which has a successive structure of ring and cross patterns.

• 한국의류학회지
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• 제42권5호
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• pp.769-785
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• 2018

This study focused on similarities between modern philosophical Nomadism and the thoughts of Korean people as well as analyzed the correlation between modern Nomad fashion and Korean traditional costumes. This study aims are as follows. First, to establish aesthetic characteristics by examining modern Nomadism and Korean thoughts. Second, draw the principles of design expressions of modern Nomad fashion and Korean traditional costumes. Third, analyze correlations between them. The method of this study was a literature review and an analysis of related photos. The study results are as follows. First, Nomadic aesthetics are characterized by the formation of complex diversity with the variability of fusion and separation through liquidity in an ambiguous boundary; in addition, various possibilities and harmony are the characteristics of Korean aesthetics, held by a holistic thought based on the vision of the universe of Qi (氣). Second, Nomad fashion appeared as variable designs through repetition and the overlapping of forms, and irregular designs were noticed through repetition and the overlapping of circles, quadrangles, and angles in Korean traditional costumes. Third, similarities in the creation of liquidity, variability, and de-territoriality based on modules can be found; in addition, common principles can also be drawn from the appearing design expressions.

• 한국환경보건학회지
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• 제18권1호
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• pp.39-46
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• 1992

It has known that the intermediates formed in acid reactions occuring during anaerobic reactions for instance, acetic acid, propionic acid and butyric acid have significant effects or the formations of biogases(e. g. mainly CH$_{4}$ and CO$_{2}$). A study on the effects of these intermediates for the formations of biogases, however, is still on initial stage due to the type and structural problems of reactor. The primary objective of this reserch program is to provide a funadmantal mechanism of involved reactions using a modified downflow multistage pecked bed bioreactor. As a first stage of this reaserch program, the following theoretical principles was applied 1. Principle of electroneutrality where the molar concentrations of cation and anion in solution are the same. 2. Relationship between the concentration of bicarbonate anion and pH as follows [HCO$_{3}^{-}$]= $K_{H}P_{T}Y_{CO_{2}}10^{pH-K_{1}}$ Based upon the above two principles, a series of experimental works was conducted to elucidated the relationship between the concentration of CO$_{2}$ and the pH related to the concentrations of cations and anions.

• 한국실내디자인학회논문집
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• 제39호
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• pp.100-107
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• 2003

The purpose of this study is to help create environments for early childhood education according to the principles of Constructivism. Generally, preschools in Ulsan Metropolitan City were used as samples for this study More particularly, 116 kindergartens were surveyed by telephone to evaluate their education programs. Four kindergartens that completely or partially used Constructivism in their programs were chosen as primary subjects for this study The results of this study were as follows: First, it was discovered that preschool education in Ulsan uses an integrated education model based on activities and Montessorie. Constructivist programs were also present using Project Approach, Reggio Emilia and Piaget. Second, the number of infants per class averaged 29.3. The average infants per playroom was 2.38$m^2$. It seems, therefore, that there is a lack of sufficient space for activities. Playroom furniture is primarily used for storage and it lacks variety and flexibility of use. The interior of preschools in related to materials, color and images also showed little difference among schools. Third, it was found that virtually every play space did not have adequate water playing and sand playing sections. Instead, the space for the large-muscle activities of big groups was used for this purpose. Fourth, kindergartens that use the principles of Constructivism plan to specialize their activities. Those only partially using Constructivism showed conventional tendencies and small play spaces that would be defined as inadequate according to Constructivism. This study, therefore, demonstrates that preschool education based on Constructivism are not being well-implemented in concert with other programs.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1987년도 전기.전자공학 학술대회 논문집(II)
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• pp.1008-1012
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• 1987

This paper describes the general approach to ISDN operation & maintenance. First we focused on the CCITT SG XVIII activities on the ISDN. As a general principles for operating and maintaining an ISDN they propose TMN(Telecommunication Management Network) concept which specifies several OM function modules and standard interfaces. Based on the concept we studied proper methodology to set up an efficient OM structure under the ISDN environments.

• 전기의세계
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• 제21권1호
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• pp.13-16
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• 1972

Dynamic Programming is regarded as a very powerful tool for solving nonlinear optimization problem subject to a number of constraints of state and control variables, but has definite disadvantages that it requires much more computing time and consumes much more memory spaces than other technigues. In order to eliminate the above-mentioned demerits, this paper suggests a news technique called Multiple Dynamic Programming. The underlying principles are based on the concept of multiple passes that, instead of forming fin lattices in time-state plane as adopted in the conventional Dynamic Programming, the Multiple Dynamic Programming constitutes, at the first pass, coarse lattices in the feasible domain of time-state plane and determines the optimal state trajectory by the usual method of Dynamic Programming, and at the second pass again constitutes finer lattices in the narrower domain surrounded by both the upperand lower edges next to the lattice edges through which the first pass optimal trajectory passes and determines the more accurate optimal trajectory of state, and then at the third pass repeats the same processes, and so on. The suggested technique insures remarkable curtailment in amounts of computer memory spaces and conputing time, and its applicability has been demonstrated by a case study on the hydro-thermal power coordination in Korean power system.

• 한국보육학회지
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• 제17권2호
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• pp.45-73
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• 2017

본 연구는 뇌 기반 학습 원리를 적용한 유아디자인교육 활동이 유아의 창의성과 친사회적 행동에 미치는 효과를 알아보는 데 목적이 있다. 실험집단 연구대상은 K광역시에 위치한 I유치원 만 5세반 유아 17명, 비교 집단의 연구대상은 S유치원 만 5세반 유아 19명이다. 실험집단 유아들에게는 8주 동안 16회에 걸쳐 뇌 기반 원리를 적용한 유아디자인교육 활동을 적용하였고, 비교집단은 연령별 만 5세 누리과정에 기초한 미술 교육 활동을 실시하였다. 연구결과는 첫째, 뇌 기반 원리를 적용한 유아디자인교육 활동을 한 실험집단 유아들이 비교집단 유아들보다 창의성의 유창성, 독창성, 민감성 점수가 높았다. 둘째, 뇌 기반 원리를 적용한 유아디자인교육 활동을 한 실험집단 유아들은 비교집단 유아들보다 도움주기, 의사소통 능력, 나누기, 감정이입 및 조절 점수가 높았다. 이러한 결과는 뇌 기반 학습 원리를 적용한 유아디자인교육 활동이 유아의 창의성과 친사회적 행동 증진에 있어 긍정적 영향을 미치며, 이는 유아의 창의성과 친사회적 행동 향상을 돕기 위한 교수 학습방법으로 뇌 기반 원리를 적용한 유아디자인교육 활동이 의미 있는 대안이 될 수 있음을 시사해 준다.