• Journal of Digital Convergence
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• v.14 no.1
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• pp.25-31
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• 2016

This study aims to suggest the improvement plan for the future church schools and the teachers after examining the reality and the situation of the teachers in church schools in Korea. In order to do this, the study examined the factors of the changes in Christian population in Korea, the factors of reduced number of Christian population and the factors of the reduced number of students in church schools. It also conducted the survey on the teachers in church schools to find the actual problems and situation of them. Based on the result and analysis of the survey, the study will suggest the alternative plans for improvement. The study asked 12 questions of 534 teachers to examine the real situations of the teachers in church schools in Korea and based on the analysis and result of it, the study will suggest a couple of alternatives to the teachers.

• Structural Monitoring and Maintenance
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• v.5 no.3
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• pp.391-416
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• 2018

The purpose of this article is to strengthen concrete structures using buckling and non-buckling braces. Connection plates are modeled in three shapes including the effect of 1.5t hinge zone length, 2t one and without the zone (1.5t-CP, 2t-CP and WCP). According to the verification performed with ABAQUS software, the connection plates which are superior in ductility and strengthening are found. The results show adding steel braces in concrete moment frames increase the strength and stiffness of the structures up to about 12 and 3 times, respectively. The frame strength increased about 21 and 25 percent with considering the effect of 2t hinge length in connection plates compared to 1.5t-CPs and WCPs. Also the ductility of retrofitted frames with 2t-CP improved 2.06 times more than WCP ones. Thus, 2t-CP sample is the best choice for connecting steel braces to concrete moment frames for retrofitting them. Afterwards, optimum conditions for elemental coating in braces with no buckling are assessed. The length of concrete coatings could be reduced about 30 percent, and buckling did not occur. Therefore, the weight of restraining coating decreased, and its performance improved. It is worth noting that BRBs could be constructed with only steel materials, which have outer steel tubes too. In fact, only the square cross sections of the tube profiles are appropriate for removing the filler concrete, and the rectangular ones are prone to buckle around their weak axis.

• The Mathematical Education
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• v.60 no.3
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• pp.321-340
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• 2021

As many changes in the future society represented by the age of artificial intelligence(AI) are expected to come, efforts are being made to draw the shape of the future education and various research methods are being employed to support the attempts. While many research studies use methods for deriving generalized results such as expert survey and trend analysis in along with a review of literature, there are attempts to apply the scenario methodology to explore ideas and information needed within a changing context. A scenario method, one of the experiential learning strategies, aims to seek various and alternative approaches by establishing a plan from the present conditions considering future changes. In this study, in-service teachers' perceptions and expectations of the interactivity between human and AI teachers were visualized by applying the role-play presentation technique that grafted the concept of role-play game to the scenario method. In addition, the mandal-art method was introduced to support in conducting productive discussion during the teachers' collaboration. This method appeared to help to depict teachers' perceptions of AI teachers in the detailed and concrete form, which may flow in the abstract otherwise. Through analyses of the teachers' role-play presentations with the implementation of the madal-art method it was suggested that most teachers would want to collaborate with an AI teacher for improved instruction and individualized student learning while they would take the instructional authority over the AI teacher in the classroom.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.22 no.4
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• pp.115-131
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• 2011

The purpose of this study is to provide self-evaluation indicators that each school could judge on its basic conditions for the school library opening to local community. School library opening to local community is one of the significantly operational strategies to contribute to the development of the learning community. But the school library has insufficient resources and support system for their local services. According to the survey teacher librarians who have the experience for their school library opening to local community have considered of deploying teacher librarian as the most important factor. And they asserted emphatically that school library would secure personnel expenses and obtain facilities and resources to provide the stable and systematic service. Also among the school library's educational activities, reading education is considered the most suitable program for the community.

• Advances in nano research
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• v.9 no.4
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• pp.237-250
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• 2020

An accurate plate theory for assessing sandwich structures is of interest in order to provide precise results. Hence, this paper develops Layer-Wise (LW) theory for reaching precise results in terms of buckling and vibration behavior of Functionally Graded Carbon Nanotube-Reinforced Composite (FG-CNTRC) annular nanoplates. Furthermore, for simulating the structure much more realistic, its edges are elastically restrained against in-plane and transverse displacement. The nano structure is integrated with piezoelectric layers. Four distributions of Single-Walled Carbon Nanotubes (SWCNTs) along the thickness direction of the core layer are investigated. The Differential Quadrature Method (DQM) is utilized to solve the motion equations of nano structure subjected to the electric field. The influence of various parameters is depicted on both critical buckling load and frequency of the structure. The accuracy of solution procedure is demonstrated by comparing results with classical edge conditions. The results ascertain that the effects of different distributions of CNTs and their volume fraction are significant on the behavior of the system. Furthermore, the amount of in-plane and transverse spring coefficients plays an important role in the buckling and vibration behavior of the nano-structure and optimization of nano-structure design.

• Steel and Composite Structures
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• v.39 no.5
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• pp.615-630
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• 2021

The main purpose of the present work was to study the dynamic instability of a three-layered, thick composite sandwich beam with the functionally graded (FG) flexible core subjected to an axial compressive follower force. Flutter instability of a sandwich cantilever beam was analyzed using the high-order theory of sandwich beams, for the first time. The governing equations in general for sandwich beams with an FG core were extracted and could be used for all types of sandwich beams with any types of face sheets and cores. A polynomial function is considered for the vertical distribution of the displacement field in the core layer along the thickness, based on the results of the first Frosting's higher order model. The governing partial differential equations and the equations of boundary conditions of the dynamic system are derived using Hamilton's principle. By applying the boundary conditions and numerical solution methods of squares quadrature, the beam flutter phenomenon is studied. In addition, the effects of different geometrical and material parameters on the flutter threshold were investigated. The results showed that the responses of the dynamic instability of the system were influenced by the follower force, the coefficients of FGs and the geometrical parameters like the core thickness. Comparison of the present results with the published results in the literature for the special case confirmed the accuracy of the proposed theory. The results showed that the follower force of the flutter phenomenon threshold for long beams tends to the corresponding results in the Timoshenko beam.

• Geomechanics and Engineering
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• v.29 no.6
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• pp.599-614
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• 2022

In this study, the reliability analysis of internal and external stabilities of Reinforced Soil Walls (RSWs) under static and seismic loads are investigated so that it can help the geotechnical engineers to perform the design more realistically. The effect of various variables such as angle of internal soil friction, soil specific gravity, tensile strength of the reinforcements, base friction, surcharge load and finally horizontal earthquake acceleration are examined assuming the variables uncertainties. Also, the correlation coefficient impact between variables, sensitivity analysis, mean change, coefficient of variation and type of probability distribution function were evaluated. In this research, external stability (sliding, overturning and bearing capacity) and internal stability (tensile rupture and pull out) in both static and seismic conditions were investigated. Results of this study indicated sliding as the predominant failure mode in the external stability and reinforcing rupture in the internal stability. First-Order Reliability Method (FORM) are applied to estimate the reliability index (or failure probability) and results are validated using the Monte Carlo Simulation (MCS) method. The results showed among all variables, the internal friction angle and horizontal earthquake acceleration have dominant impact on the both reinforced soil wall internal and external stabilities limit states. Also, the type of probability distribution function affects the reliability index significantly and coefficient of variation of internal friction angle has the greatest influence in the static and seismic limits states compared to the other variables.

• Korean Journal of Childcare and Education
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• v.8 no.3
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• pp.249-272
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• 2012

This study has been carried out to suggest an improvement measure by analysing the current situation of the working condition for the teachers in child care. For this, governmental policy and law and relevant references in relation to the working conditions for the teachers have been collected for analysis. On the basis of the research, in order to improve the working condition for the teachers the following suggestions have been made: provision of salary system considered the level of qualification criteria and academic certificate, carrying out a raise in pay according to the salary class, requirement of written indication of a provision of allowance, increase of the initial salary for the principal of nurseries, observance of legislation for payment of excess duty allowance, elucidation of legislation for the salary of the teacher in unsupported nurseries and settlement of ratio of supporting personnel expenses from government.

• Korean Journal of Childcare and Education
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• v.11 no.2
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• pp.201-220
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• 2015

The purpose of this study is to analyse the effects of teachers'personal background (academic, education career) and institutional characteristic factors(founded facility type, class size, and curriculum organization type) on the quality of the classroom in early childhood education and care(ECEC) fields. This study is to explore the conditions for improving the quality of ECEC, looking back on a traditional paradigm focused on teacher education and qualifications. The hierarchical regression analysis was conducted through a survey as a research method. The results indicated that the effects of institutional characteristics were more influential than teachers' education on classroom quality. Public kindergartens and child care centers were reported to have higher effects than the private ones on classroom quality. Based on these results, policy implications and future research plans were suggested in perspective of improving the publicness of ECEC services.

• International Journal of Computer Science & Network Security
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• v.21 no.7
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• pp.169-172
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• 2021

Based on the scientific and pedagogical analysis of the theory and experience of teaching computer science disciplines, the didactic mechanism for ensuring the continuity of the average (full) general and higher professional education of economists for practical implementation innovative technology of personal experience foundation. The pedagogical conditions for the formation of information competence, including laboratory, design, research work, the use of active teaching methods for acquiring management skills in production and activities of the enterprise. An indispensable requirement for the conditions for the implementation of basic of educational programs is the assessment of competencies. With this the goal was to develop criteria and levels of formation information competence of future economists and carried out complex diagnostics.