• Journal of the Korea Convergence Society
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• v.10 no.6
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• pp.129-138
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• 2019

The trend of maker education has been mainly focused on program using digital devices, but maker education programs that can make students' creative ideas instantly in various shapes and make them by hand is insufficient. Therefore, in this study, we developed a maker education program using cement and molds and analyzed Effect on the convergence ability for creativity of students. In the preparation stage, educational use cases about cement and molds and the study objects and contents were extracted through the literature review. In the development stage, teaching-learning materials were developed and validity and evaluation tools to measure convergence ability for creativity were selected. In the implementation stage, the expert validity test on the teaching-learning materials and convergence ability test for creativity was evaluated, In the evaluation stage, the effects of the whole area and sub-area of the convergence ability for creativity was analysed. As a result of the t-test for the whole area of convergence ability for creativity, the students who took the maker education program showed a significant change. The test results on the teaching-learning materials showed a positive response to the communication, cooperation ability, knowledge and humanism.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.23 no.9
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• pp.1038-1048
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• 2019

Recently, various systems have been developed to support ship navigation safety. In order to verify the usefulness of such a system, it is most ideal to try it on a real vessel, but there are many difficulties. As an alternative, usability verification methods applied with modelling and simulation (M&S) techniques are required such as FMSS, which is closest to reality, is very expansive to construct, and there needs the specialized operator. For this reason, this paper proposes a method to verify the navigation safety support system by modeling and simulation techniques based on the Discrete Event System Specification (DEVS) formalism. As a first step, we designed the navigation simulation architecture based on the SES/MB framework, and details on modelling ship core equipment and navigator agents based on the DEVS. Through this, we are able to implement the navigation simulation system for vessels, and evaluate the effectiveness of navigation safety support elements such as collision avoidance, etc. using developed scenarios.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.17 no.1
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• pp.29-36
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• 2019

High-level radioactive waste (HLW) such as spent fuel is inevitably produced when nuclear power plants are operated. A geological repository has been considered as one of the most adequate options for the disposal of HLW, and it will be constructed in host rock at a depth of 500~1,000 meters below ground level with the concept of an engineered barrier system (EBS) and a natural barrier system. The compacted bentonite buffer is one of the most important components of the EBS. As the compacted bentonite buffer is located between disposal canisters with spent fuel and the host rock, it can restrain the release of radionuclides and protect canisters from the inflow of groundwater. Because of inflow of groundwater into the compacted bentonite buffer, it is essential to investigate soil-water characteristic curves (SWCC) of the compacted bentonite buffer in order to evaluate the entire safety performance of the EBS. Therefore, this paper conducted laboratory experiments to analyze the SWCC for a Korean Ca-type compacted bentonite buffer considering dry density, confined or unconfined condition, and drying or wetting path. There was no significant difference of SWCC considering dry density under unconfined condition. Furthermore, it was found that there was higher water suction in unconfined condition that in confined condition, and higher water suction during drying path than during wetting path.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.1
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• pp.188-196
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• 2021

Korea has invested heavily in projects related to national rivers, but there is no evaluation technique and system to manage river projects that can evaluate the effectiveness of the river projects after they are completed. Their absence leads to the inability of information on river construction sections, analysis of project effects, and benchmarking between projects. This may cause over-budget, overlapping investment problems due to the implementation of similar projects in the same section, and incorrect business elements may be repeatedly utilized. In order to solve this shortcoming, this study developed river project evaluation techniques and a river project (construction) management system. The development of evaluation techniques enables comparison and analysis between projects and can be utilized in establishing maintenance plans. The system can also provide inquiry of construction information, visualization of construction, and management of performance items. In this study, the evaluation techniques developed through prior research were modified and supplemented, and the effectiveness was verified by applying them to national river projects in A river and B river. It is expected that the evaluation techniques and system utilization measures presented will increase the work efficiency of river projects and enhance the efficiency of river projects.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.3
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• pp.707-725
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• 2021

Energy management systems (EnMS) contribute to sustainable energy saving and greenhouse gas reduction by emphasizing the role of energy management in production-oriented economies. Although understanding the methods used to measure energy performance is a key factor in constructing successful EnMS, few attempts have been made to examine these methods, their applicability, and their utility in practice. To fill this research gap, this study aimed to deepen the understanding of energy performance measures by focusing on four energy performance indicators (EnPIs) proposed by ISO 50006, namely the measured energy value, ratio between measured values, linear regression model, and nonlinear regression model. This paper presents policy and managerial implications to facilitate the effective use of these measures. An analytic hierarchy process (AHP) analysis was conducted with 41 experts to analyze the preference for EnPIs and their key selection criteria by the industry sector, and organization and user type. The findings suggest that the most preferred EnPI is the ratio between the measured values followed by the measured energy value. The ease of use was considered to be most important while choosing EnPIs.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.6
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• pp.90-99
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• 2021

This study was conducted to provide basic data for improving nursing management practice by comparing and analyzing the perceptions of nursing students and clinical instructors about the importance of the learning contents of nursing management and their practical experience. The final 343 copies were analyzed using the Mann-Whitney test and cross-analysis, targeting 4th-grade students and clinical instructors at three universities. Both nursing students and clinical instructors recognized 'communication', 'interpersonal relationship', 'responsibility', 'trust', and 'morality' as important factors in the evaluation items of practice. Among the top 10 most importantly recognized items among nursing-management practice learning content, six items ('infection control', 'nursing record management', 'patient nursing management', 'drug management', 'patient safety', and 'nursing malpractice') were matched in the two groups. Moreover, clinical instructors recognized that interpersonal relationships and relationship ethics were important, while nursing students chose legal responsibility. As a result of the practical experience analysis between the two groups, nursing students had high experience of indirect participation, but the clinical instructors had a high experience of direct instruction. A plan is needed to reduce the difference by establishing an organic partnership relationship between the university and practice institutions and increase the experience of direct practice of nursing students.

• Korean journal of applied entomology
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• v.60 no.1
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• pp.123-133
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• 2021

In order to use Osmia cornifrons more effectively in apples, we investigated the pollination effect and nesting activity of O. cornifrons on 'Hongro', the middle-season cultivar, and 'Fuji', the late-season cultivar. There was a significant difference in the nesting activity and pollination effect of O. cornifrons depending on the apple cultivar. The nesting activity, rate of trap nesting, and reproduction in 'Fuji' were 2.5, 1.5, and 3.8 times greater than in 'Hongro', respectively. The pollination effect according to cultivar 'Fuji' was 1.6 times greater than that of 'Hongro' in the central fruit set. In terms of the quality of fruit, the asymmetry index of 'Fuji' was 2.5 times lower than that of 'Hongro', and the number of apple seeds of 'Fuji' was 1.9 times greater than that of 'Hongro'. The main reason for this result was the air temperature. The activity of O. cornifrons was most affected by air temperature (R2 = 0.578). It is expected that the nesting activity and pollination effect are great in 'Fuji' (17.4-24.1℃) when the temperature during the blooming period is higher than that of 'Hongro' (12.5-20.2℃). Our study provides important information on stable apple production for apple cultivators, and can be used as an evidence for changes in flora and insect fauna caused by climate change.

• The Journal of the Convergence on Culture Technology
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• v.8 no.2
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• pp.343-348
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• 2022

This study aims to analyze the user experience of unmanned checkout counters perceived by consumers using SNS big data. For this study, blogs, news, intellectuals, cafes, intellectuals (tips), and web documents were analyzed on Naver and Daum, and 'unmanned checkpoints' were used as keywords for data search. The data analysis period was selected as two years from January 1, 2020 to December 31, 2021. For data collection and analysis, frequency and matrix data were extracted through Textom, and network analysis and visualization analysis were conducted using the NetDraw function of the UCINET 6 program. As a result, the perception of the checkout counter was clustered into accessibility, usability, continuous use intention, and others according to the definition of consumers' experience factors. From a supplier's point of view, if unmanned checkpoints spread indiscriminately to solve the problem of raising the minimum wage and shortening working hours, a bigger employment problem will arise from a social point of view. In addition, institutionalization is needed to supply easy and convenient unmanned checkout counters for the elderly and younger generations, children, and foreigners who are not familiar with unmanned calculation.

• The Journal of the Convergence on Culture Technology
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• v.7 no.4
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• pp.461-469
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• 2021

Houses contain our own characteristics and philosophy. As a Yangban house in the late Joseon Dynasty, the house of Kwon Hee-moon was constructed over 250 years to the present. Therefore, this house can more objectively examine the aesthetic ideals, such as the thoughts and philosophies of the house owners across the generations. The name of Sarang-Chae is Ui-Wang-Seo(嶷汪棲), it shows thoughts and philosophies symbolically. Ui(嶷)·Wang(汪) mean the elements of nature, and Seo(棲) symbolizes living together, It is aesthetics of Nature, aesthetics of Human boundary. Aesthetics of Nature boundary is aesthetics of Ui(嶷)·Wang (汪), so it is clear and fine. Aesthetics of Human boundary is aesthetics of Seo(棲), so it has meditation and purity. As such, the aesthetic ideal of Kwon Hee-moon's house pursues the ideal of life. Through the aesthetic boundary of the house of Kwon Hee-moon, we can understand the aesthetic boundary of Honam Yang-ban House in the Late Chosun Dynasty.

• Journal of Korean Tunnelling and Underground Space Association
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• v.24 no.5
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• pp.411-429
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• 2022

Instrumentations are essential in NATM tunnels, however measuring instruments are installed and applied without performance verification procedures due to insufficient research on methods, procedures, regulations, etc. to verify the reliability of the measuring instruments. In this study, domestic and foreign regulations relating to the verification and calibration of instruments were investigated and necessities for accreditation standards were proposed. In order to identify the causes of the defects, an external inspection was performed on rock bolt stressmeter and rod extensometer, which are measuring instruments with relatively complex structures. For verifying the performance of these instruments, verification devices were developed that can load step-by-step and the causes of defects were identified in measuring instruments of nine domestic manufacturers. Through the performance test, a number of measuring instruments were found to be defective. It was important to test the performance of the instruments in the state of a finished product and accordingly performance inspection methods and procedures were proposed. The results of this study are expected to help preparing related regulations for verifying instrument performance and selecting instruments in the field.