• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.1
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• pp.270-278
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• 2018

In this study, the Pedagogical Content Knowledge for childhood's music education and Teacher's Efficacy empirically examined the relationship between teachers' attitudes through structural equation model analysis. Data were collected for 132 infant teachers working for early childhood educational institutions for this study. Structural equation model analysis was performed using SPSS and AMOS. In this research, conformity to the research model was appropriate. Pedagogical content knowledge for childhood's music education clearly confirmed the relationship between the teacher's efficacy, the attitude variables of the teacher. The Pedagogical Content Knowledge for childhood's music education proved to have a meaningful influence on the attitude of the teacher for music education. The Pedagogical Content Knowledge for childhood's music education proved to have a meaningful influence on Teacher's Efficacy for music education. The Pedagogical Content Knowledge for childhood's music education has been found to influence the attitude of the teacher indirectly with the intermediation of Teacher's Efficacy. The effect of the parameter was the effect of the partial parameters. The results of this study can be used as basic material important for strengthening the expertise of young children's teachers for music development of young children. In particular, it was confirmed that the knowledge variable of the content of the music professor of an infant teacher is a very important variable in early childhood music education.

• Journal of the Korea Institute of Building Construction
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• v.22 no.6
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• pp.631-640
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• 2022

Recently, construction accidents have occurred due to illegal water addition and insufficient quality control at domestic construction sites. In this study, the void content test method proposed in ASTM C 642 was used to provide a reference guideline for evaluation on the quality control status of cast-in-place structural concrete. For this purpose, simulated structural concrete for coring purpose was prepared in addition to the concrete cylindrical specimens with the same formulation, and the changes in compressive strength, elastic modulus, and void content related to coring were evaluated. According to experimental results, the compressive strength and modulus of elasticity were reduced by coring, which was associated with the generation of microcracks during coring. With respect to void content, the difference in void content between the cylindrical specimen and the cored specimen was up to 1.69%. If this value is used as a correction factor, it is possible to estimate the real void content of the cast-in-place structural concrete. By comparing this with the void content obtained from cylindrical concrete specimens, it is possible to evaluate the quality control status and amount of illegal water addition on the structural concrete.

• Journal of the Korean Society of Environmental Restoration Technology
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• v.16 no.2
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• pp.127-135
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• 2013

This study was carried out to verify the suitability of GRS(Glass-fiber Reinforced Slag) as natural type landscape stone according to the material property and structural safety performance standards. The structural safety performance of the GRS panel showed 12.4MPa and 16.2MPa each in flexural strength at 2 and 3% content of glass fiber while the flexural strength at 4 and 5% of glass fiber content showed 26.9MPa, and 30.2MPa, respectively, all satisfying the standards. In addition, air-dried gravity was found to be 1.82~1.89 in measuring range at 2~5% level of glass fiber content, satisfy the existing standards 1.8~2.3. In structural safety performance, the range of flexural strength consequent on glass fiber content was surveyed to be 12.8~30.2MPa, all satisfying the performance standards, while 10MPa and more while the compressive strength range was found to be 41.5~53.3MPa, all satisfying the performance standards, 40~60MPa. This study judged the suitability of only the items for a property of matter of landscape stone GRS by applying the natural-form landscape stone GFRC material standard, but in case an installation constructed with GRS material comes into existence later, there should be comprehensive performance guidelines through the research on durability, landscape performance and environmental and ecological performance.

• Journal of Technology Innovation
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• v.26 no.4
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• pp.122-145
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• 2018

This paper investigates the relationship between R&D professionals' career plateau and organizational commitment in which career plateau's sub-dimensions consist of structural and job-content plateau. Further, it aims to examine the moderating effect of age and creative behavior of R&D professionals on the relationship between career plateau and organizational commitment. Empirical data were collected from 418 R&D professionals who work for Government sponsored research institutions. The results showed that the relationship between structural plateau and organizational commitment is differently related depending on age level. That is, the negative relationship between structural plateau and organizational commitment is stronger for junior R&D professionals. Furthermore, the relationship between job-content plateau and organizational commitment is negatively related, and differs in the strength depending on the creative behavior level of R&D professionals. For one with stronger characteristics of creative behavior, job-content plateau is more negatively related to organizational commitment. Based on the results, some implications are suggested on the career plateau issues of R&D professionals who work for government sponsored research institutions. Finally, it is discussed on the limitations of this study and further research directions.

• Asian-Australasian Journal of Animal Sciences
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• v.33 no.2
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• pp.254-263
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• 2020

Objective: The objective of this study was to investigate the effects of wilting and additives on the fermentation quality, structural and non-structural carbohydrate composition of mulberry silages. Methods: The selected lactic acid bacteria strains Lactobacillus plantarum 'LC279063' (L1), commercial inoculant Gaofuji (GF), and Trichoderma viride cellulase (CE) were used as additives for silage preparation. Silage treatments were designed as control (CK), L1, GF, or CE under three wilting rates, that is wilting for 0, 2, or 4 hours (h). After ensiling for 30 days, the silages were analyzed for the chemical and fermentation characteristics. Results: The results showed that wilting had superior effects on increasing the non-structural carbohydrate concentration and degrading the structural carbohydrate. After ensiling for 30 days, L1 generally had a higher fermentation quality than other treatments, indicated by the lower pH value, acetic acid, propionic acid and ammonia nitrogen (NH₃-N) content, and the higher lactic acid, water soluble carbohydrate, glucose, galactose, sucrose, and cellobiose concentration (p<0.05) at any wilting rate. Wilting could increase the ratio of lactic acid/acetic acid and decrease the content of NH₃-N. Conclusion: The results confirmed that wilting degraded the structural carbohydrate and increased the non-structural carbohydrate; and L1 exhibited better properties in improving fermentation quality and maintaining a high non-structural carbohydrates composition compared with the other treatments.

• Journal of Agricultural Extension & Community Development
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• v.22 no.4
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• pp.435-444
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• 2015

This study analyzes the structural relationship between attitudes and learning more properties in agricultural college education programs. The results were as follows. first, The model was accepted according to the some goodness of fit statistics such as ${\chi}^2$(84.28, p>.05), RMR(.036), RMSEA(.041), GFI(.927), NFI(.945), CFI(.985), IFI(985). seconds, Learning attitude(.31) and content validity(.47) in the structural relationship between variables is a direct impact on satisfaction. thirds, Perceived Usefulness(.34) and Content validity(.36) has direct effect of factor on learning attitude. Finally Perceived Usefulness was found to direct effect all Content validity(.64) and easy of use(.27). Finally, considering of duties required in the agriculture. increase the satisfaction of learners should have provide field learning based Learning materials, practices, instructional media. As a result, it will enhance the performance of field learning agricultural education programs.

• Computers and Concrete
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• v.30 no.4
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• pp.257-267
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• 2022

Two different types of rubber aggregates (40 mesh rubber powder and 1-4 mm rubber particles respectively) were devised to substitute fine aggregates at 10%, 15%, 20% and 30% by volume in self-compacting concrete to investigate their basic mechanical properties. The results show that with the increase of rubber content, the reduction of compressive strength, splitting tensile strength and static modulus of elasticity gradually increase, and energy dissipation performance gradually increase. The rubber addition significantly reduces brittleness and decelerates damaged process. Whilst, the effect of rubber particles is greater when they are finer. Considering the mechanical properties, the optimal rubber content is 10%. It is recommended that the rubber volume content in rubberized concrete (RC) should not be higher than 20%. In addition, a constitutive model under uniaxial compression was proposed basing on the strain equivalent principle of Lemaitre and the damage theory, which was in good agreement with the test curves.

• Human Ecology Research
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• v.61 no.3
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• pp.475-492
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• 2023

This study investigated player responses to microtransactions in freemium Massively multiplayer online roleplaying games (MMORPG), specifically focusing on the game LostArk using English language review data. To this end, structural topic modeling was employed and the following six microtransaction-relevant topics were identified: microtransactions, developer issues, real money trade (RMT), random number generator (RNG) upgrade system, game content, and collectibles & adventure. The first four topics were classified as being "not recommended". However, the proportions of microtransaction-related topics were relatively lower than the other topics. Additionally, this study did not extract keywords related to unfairness and unethical issues in previous microtransaction research. The last two topics, game content, and collectibles & adventure were "recommended" topics, indicating positive functions of microtransactions such as enhancing the game experience by purchasing virtual items. Moreover, it was found that players who do not engage in microtransactions can still be satisfied through continuous game content updates. Additionally, an examination of the interaction effect between time and recommendation status revealed that while the frequency with which the six microtransaction-related topics were mentioned increased over time in the reviews, the ratio of recommendations to non-recommendations varied differently. This study contributes to game-related research by revealing players' authentic opinions on microtransactions in freemium MMORPGs, thereby providing practical implications for game companies.

• The Transactions of the Korean Institute of Electrical Engineers C
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• v.53 no.11
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• pp.556-560
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• 2004

In this paper, thermal and structural properties of epoxy/elastomer blend were measured by DSC, TGA and FESEM. Specimens were made of dumbbell forms by the ratio of 5, 10, 15, and 20[phr] by changing elastomer content. The measuring temperature ranges of DSC were from -20[℃] to 150[℃] and heating rate was 4[℃/min]. And the measuring temperature ranges of TGA were from 0[℃] to 800[℃], and heating rate was 5[℃/min]. Also we observed structure of specimens through FESEM with magnification of 1000 times and voltage of 15[kV] by breaking quenched specimens. As experimental results, we could know that thermal and structural properties were improved according to decrease of elastomer content. Because it increased glass transition temperature, high temperature and structure of elastic epoxy.

• Proceedings of the KSR Conference
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• 2004.10a
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• pp.680-685
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• 2004

The effects of acid rain and salt content on corrosion behavior were investigated with rolling stock structural steels be caused by environmental. Since these materials are exposed to the corrosive environments like polluted air, acid rain and sea water, it is important to investigate corrosion behaviour in various corrosive environments. The aqueous corrosion of the characteristic materials in aerated acid rain and neutral solution were studied by using immersion tests, electrochemical measurements and analytical techniques. In order to examine corrosion characteristic, structural steels were electrochemically evaluated with respect to the dissolved oxygen content, pH, chloride ion concentration.