• Journal of Practical Engineering Education
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• v.14 no.1
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• pp.195-203
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• 2022

Recently, as the introduction of smart factories spreads, interest and research on the positive and negative effects of smart factory introduction are increasing. This study quantitatively analyzed the changes in the workplace innovation index following the introduction of smart factory for 750 companies in the 4 categories of the workplace innovation index. Overall, the workplace innovation index of companies that introduced smart factory was higher than those that did not, and there was a statistically significant difference, especially in the work organization. In addition, as a result of analyzing the effects of smart factory introduction and workplace innovation consulting together, in the case of labor-management relations and work organization, the introduction of a smart factory and consulting were found to match the improvement of the workplace innovation index.

• The Mathematical Education
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• v.55 no.4
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• pp.417-445
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• 2016

The purpose of this research is to discover and analyze the stages of concern, level of use, innovation configurations and the analysis of their relationship to each other of storytelling-based math education among elementary teachers based on the concerns-based adoption model (CBAM). And then the researcher derives support strategies for the education by empirically examining at which levels and how actual elementary teachers perceive storytelling-based math education and also how they adopt it. In addition, the researcher lays the purpose of this study on seeking proper supporting strategies for helping elementary teachers implement storytelling-based math education and providing basic material for teaching activities by examining the correlation between stages of concern, levels of use and the innovation configuration, and grasping the relation between teachers concern and their educational practice regarding storytelling-based math education.

• Electronic Materials Letters
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• v.14 no.6
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• pp.718-724
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• 2018

With the development of photovoltaic industry, the cost of photovoltaic power generation has become the significant issue. And the metallization process has decided the cost of original materials and photovoltaic efficiency of the solar cells. Nowadays, double printing process has been introduced instead of one-step printing process for front contact of polycrystalline silicon solar cells, which can effectively improve the photovoltaic conversion efficiency of silicon solar cells. Here, the relative cheap Cu paste has replaced the expensive Ag paste to form Ag/Cu composite front contact of silicon solar cells. The photovoltaic performance and the cost of photovoltaic power generation have been investigated. With the optimization on structure and height of Cu finger layer for Ag/Cu composite double-printed front contact, the silicon solar cells have exhibited a photovoltaic conversion efficiency of 18.41%, which has reduced 3.42 cent per Watt for the cost of photovoltaic power generation.

• Earthquakes and Structures
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• v.9 no.5
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• pp.1029-1044
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• 2015

To investigate the seismic pounding response of long-span bridges with high-piers under strong ground motions, shaking table tests were performed on a 1/10-scaled bridge model consisting of three continuous spans with rigid frames and one simply-supported span. The seismic pounding responses of this bridge model under different earthquake excitations including the uniform excitation and the traveling wave excitations were experimentally studied. The influence of dampers to the seismic pounding effects at the expansion joints was analyzed through nonlinear dynamic analyses in this research. The seismic pounding effects obtained from numerical analyses of the bridge model are in favorable agreement with the experimental results. Seismic pounding effect of bridge superstructures is dependent on the structural dynamic properties of the adjacent spans and characteristics of ground motions. Moreover, supplemental damping can effectively mitigate pounding effects of the bridge superstructures, and reduce the base shear forces of the bridge piers.

• Nuclear Engineering and Technology
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• v.54 no.11
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• pp.4049-4061
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• 2022

TRISO-coated particle fuel is widely used in high temperature gas cooled reactors and other advanced reactors. The performance of coated fuel particle is one of the fundamental bases of reactor safety. The failure probability of coated fuel particle should be evaluated and determined through suitable fuel performance models and methods during normal and accident condition. In order to better facilitate the design of coated particle fuel, a new TRISO fuel performance code named FRAT (Fission product Release Analysis Tool) was developed. FRAT is designed to calculate internal gas pressure, mechanical stress and failure probability of a coated fuel particle. In this paper, FRAT was introduced and benchmarked against IAEA CRP-6 benchmark cases for coated particle failure analysis. FRAT's results agree well with benchmark values, showing the correctness and satisfactory applicability. This work helps to provide a foundation for the credible application of FRAT.

• Nuclear Engineering and Technology
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• v.55 no.4
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• pp.1350-1364
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• 2023

2D/1D coupling method is an important neutron transport calculation method due to its high accuracy and relatively low computation cost. However, 2D/1D coupling method may diverge especially in small axial mesh size. To analyze the convergence behavior of 2D/1D coupling method, a Fourier analysis for k-eigenvalue neutron transport problems is implemented. The analysis results present the divergence problem of 2D/1D coupling method in small axial mesh size. Several common attempts are made to solve the divergence problem, which are to increase the number of inner iterations of the 2D or 1D calculation, and two times 1D calculations per outer iteration. However, these attempts only could improve the convergence rate but cannot deal with the divergence problem of 2D/1D coupling method thoroughly. Moreover, the choice of axial solvers, such as DGFEM SN and traditional SN, and its effect on the convergence behavior are also discussed. The results show that the choice of axial solver is a key point for the convergence of 2D/1D method. The DGFEM SN based 2D/1D method could converge within a wide range of optical thickness region, which is superior to that of traditional SN method.

• Journal of the Korea Convergence Society
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• v.9 no.10
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• pp.167-182
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• 2018

This study was conducted to seek the innovation challenges of "University Department of Special Education" with convergence on lifelong education of the disabled which is constantly stressed due to the educational needs of the disabled. For this purpose, the study first examined the compatibility between special education and lifelong education of the disabled based on the universal basis and then suggested faculty competence development for the foundation of organization and an integrated cooperation system of "University Department of Special Education" with support of National Institute for Lifelong Education of Disabled, lifelong education centers, related local organizations, and local colleges. In regards to the curriculum, the study also suggested lifelong education curriculum of disabled within the university lifelong education centers and a foundation for gradual restructuring of the curriculum of the "Department of Special Education". A program for 'lifelong education instructors for disabled (temporary name)' was introduced based on interdisciplinary course with "University Department of Special Education" for qualification of instructions.

• Nuclear Engineering and Technology
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• v.51 no.8
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• pp.1970-1977
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• 2019

Understanding the irradiation hardening effect of structural steels under various irradiation conditions plays an important role in developing advanced nuclear systems. Such being the case, a crystal plasticity model for body-centered cubic (BCC) crystal based on the density of dislocations and irradiation defects is summarized and numerically implemented in this paper. Based on this model, nano-indentation hardness of Chinese A508-3 steels with ion irradiation is calculated. Very good agreement is observed between simulation and experimental data of several different irradiation doses subjected to various operating temperatures, from which, it can be concluded that indentation hardness increases with increasing irradiation dose at both room temperature and high temperature. Consequently, the validity of this model has been proved properly, and furthermore, the model established in this paper could guide the study of irradiation hardening effect and temperature effect to some extent.

• Nuclear Engineering and Technology
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• v.53 no.5
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• pp.1416-1428
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• 2021

Pebble flow characteristics can be significantly affected by the configuration of pebble bed, especially for HTGR pebble beds. How to achieve a desired uniform flow pattern without stagnation is the top priority for reactor design. Pebbles flows inside some specially designed pebble bed with arc-shaped contraction configurations at the bottom, including both concave-inward and convex-outward shapes are explored based on discrete element method. Flow characteristics including pebble retention, residence-time frequency density, flow uniformity as well as axial velocity are investigated. The results show that the traditionally designed pebble bed with cone-shape bottom is not the most preferred structure with respect to flow pattern for reactor design. By improving the contraction configuration, the flow performance can be significantly enhanced. The flow in the convex-shape configuration featured by uniformity, consistency and less stagnation, is much more desirable for pebble bed design. In contrast, when the shape is from convex-forward to concave-inward, the flow shows more nonuniformity and stagnation in the corner although the average cross-section axial velocity is the largest due to the dominant middle pebbles.

• Journal of Engineering Education Research
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• v.16 no.1
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• pp.45-53
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• 2013

The Korean Society for Engineering Education (KSEE) has been conducted scholarship meeting, workshop, and publicated academic journal, Engineering Education Research, since 1998. Kim Jin-soo analysed 'Engineering Education Research' on methods of research and contents. However, there are an in crease in quantity since then, it needed to analyse and arrange. This study analysed all 417 papers which were published from 1998 to 2012. The conclusion is as in the following. First, the number of collections published has been increasing up to 6 per year. 75.5% of the lead author's institution are universities, and Engineering Education Innovation Center researcher has been increasing steadily up to 8.9%. Research about Engineering Education Methods and Programs are being mostly studied. Apart from classified field in this, a study on the psychological characteristics of technology students are being steadily researched. In papers, the literature/development research method is used the most frequently (54.6%), the research study (39.9%) is the next and the experimental research method (5.5%) is followed by. Since 2006, study using the experimental research method is the growing lately. Second, characteristic of study between institution of lead author, a field of study, a number of study and methods of research by cross analyzing. The result is as in the following. In case of university and Engineering Education Innovation Center researcher studied much more about Engineering Education Methods and programs, research laboratory researcher tend to study about Engineering Educational Philosophy and Policy. Also, foreign researcher tend to introduce Engineering Education Example and Lecture. In case of university and foreign researcher used the literature/development research method frequently. Engineering Education Innovation Center and research laboratory and school researcher used the research study much more. There is no difference between a field of study and research methods. Finally, research strategies and new direction for improving the engineering education journal's papers at the section of discussion and suggestion were suggested.