• Advances in concrete construction
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• v.16 no.5
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• pp.269-276
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• 2023

In order to study the effect of rubber particle size and admixture on the frost resistance of self-compacting concrete, three self-compacting concrete specimens with equal volume replacement of fine aggregate by rubber particles of different particle sizes were prepared, while conventional self-compacting concrete was made as a comparison specimen. The degradation law of rubber aggregate self-compacted concrete under freeze-thaw cycles was investigated by fast-freezing method test. The results show that the rubber aggregate has some influence on the mechanical properties and freeze-thaw durability of the self-compacting concrete. With the increase of rubber aggregate, the compressive strength of self-compacting concrete gradually decreases, and the smaller the rubber aggregate particle size is, the smaller the effect on the compressive strength of the matrix; rubber aggregate can improve the frost resistance of self-compacting concrete, and the smaller the rubber particle size is, the more obvious the effect on the improvement of the frost resistance of the matrix under the same dosage. Through the research of this paper, it is recommended to use 60~80 purpose rubber aggregate and the substitution rate of 10% is chosen as the best effect.

• The Korean Journal of Coaching Psychology
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• v.5 no.1
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• pp.33-65
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• 2021

This study is an exploratory study to investigate the concept of student success recognized by college students. In order to listen to students' free thoughts, an open questionnaire was conducted using an online questionnaire and 99 responses were analyzed. The response results were analyzed using CQR-M (Consensual Qualitative Research-Modified). As a result of the analysis, 25 categories were derived from three domains. The frist domain, 'meaning of student success' recognized by college students is with 9 categories: 'academic achievement', 'job competency improvement', 'gaining diverse experiences', 'satisfactory employment', 'setting of desired career path', 'relationship-building ability improvement', 'setting and achievement of own goals', 'self-development', and 'satisfactory college life'. The second domain, 'college environmental factors for student success' is with 7 categories: 'career development support', 'job competency improvement system', 'support for participation in college life', 'opportunities to form human networks', 'learning capability enhancement system', 'expansion of economic support', and 'environment for student convenience'. The third domain, 'psychological factors necessary for student success' is with 9 categories: 'learning ability', 'self-efficacy', 'interpersonal competence', 'self-awareness and improvement', 'job competency', 'self-regulation ability', 'rich experience', 'career awareness', and 'self-esteem'. The frequency and results of each domain were analyzed and presented, the significance and limitations of the study were discussed, and suggestions for subsequent studies were made.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2012.11a
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• pp.261-262
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• 2012

The field application through the quality control of self adhesive rubberized asphalt waterproofing sheet was regulated by KS F 4934 of Korea Standard in 2003. However, regulations that different material properties of self-Adhesive waterproofing sheets are difficult on the standard. Therefore, this research was performed for of quality control all affiliations of self-adhesive waterproofing sheet through basic properties test and proposed quality standard revised bill in KS F 4934.

• Proceedings of the Korea Concrete Institute Conference
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• 2001.11a
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• pp.275-280
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• 2001

Recently, self-compacting concrete is applied in order to achieve workability improvement and rationalization in construction. But self-compacting concrete using viscosity agent has a difficulty in practical use because viscosity agent is invested small quantity and by man-power. Therefore in this paper we have been focused on the development and practical use of self-compacting concrete by hydraulic composition containing the segregation-reducing agent. According to mix variable, we find out right quantity of water, binder and rate of admixture replacement, and also we find out the optimum mix proportion. In the result, self-compacting concrete by hydraulic composition containing the segregation reducing agent gave satisfaction with standard and its demand will increase in the future.

• The Korean Journal of Emergency Medical Services
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• v.17 no.3
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• pp.61-71
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• 2013

Purpose: This study was conducted to evaluate the effects of the simulation education integrated with problem based learning on critical thinking disposition and self-efficacy on paramedic students. Methods: The study subjects were 48 students. Pre and post design with nonequivalent control group was assigned. The experimental group received the one week education for 4 weeks(4 sessions in total) with 90 minutes for each session. The control group received a regular skill training curriculum. Results: The experimental group showed significantly higher improvement of self-efficacy and critical thinking disposition preference compared with the control group. Conclusion: These findings indicate that simulation education with scenario was effective in improving the critical thinking disposition and self-efficacy in paramedic students.

• The Transactions of the Korean Institute of Power Electronics
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• v.9 no.2
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• pp.134-141
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• 2004

This paper presents a method of synchronous rectifier(SR) for improving the efficiency in DC/DC converter. The proposed method is used push-pull topology on primary as a single winding self driven synchronous rectification(SWSDSR). Specially, this method can improve efficiency to turn on SR switch during dead time. Finally, the simulation and experimental results will be given to show comparison and analysis on the efficiency between self driven synchronous rectification(SDSR) and SWSDSR method.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 1995.10b
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• pp.25-28
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• 1995

A Practical application of self-tuning fuzzy controller to a multi-input multi-output complex system of a vehicle engine is investigated. The ovjective is to design a controller to improve the transient performance in torque and RPM mode changes. For the performance improvement in the multivariable comples system, the self-tuning function of internal parameters is essential and practical. The measured output variables using different control schemes are compared the advanteges of the self-tuning fuzzy logic controller are better output performances and the effectiveness in the controller design using many parameters.

• The Journal of Korean Academic Society of Nursing Education
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• v.25 no.4
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• pp.393-404
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• 2019

Purpose: This study aims to investigate the influence of personality type, self-leadership, and positive psychological capital on the flow of learning of nursing students. Methods: The sample consisted of 179 nursing students. Data were analyzed using frequency, percentage, mean, standard deviation, t-test, ANOVA, $Scheff{\acute{e}}^{\prime}s$ test, Pearson's correlation coefficient analysis, and Hierarchical multiple regression. Results: Upon analysis, the relative influence of the variables that can improve learning flow, the influencing variables, were identified as self-leadership and self-efficacy. Conclusion: To increase the learning flow, supportive measures and strategies that increase positive psychological capital should be developed, successful cases of self-leadership be shared, and be incorporated into a culture that promotes learning flow. And to promote the learning flow, it needs political and environmental improvement, and institutional support of at the college level.

• Journal of the Korea Safety Management & Science
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• v.17 no.3
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• pp.297-306
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• 2015

The purpose of this thesis is to contribute in establishing the objectives of government policies through an empirical analysis on the relational characteristics surrounding the self-employed creative enterprises under the current circumstances where the specific empirical studies on the self-employed creative enterprises haven't been performed. According to the result of verification, the social capitals such as reliability, reciprocity and network are necessary due to the characteristics possessed by the self-employed creative enterprises while the reliability between cooperative enterprises is created and the cooperative relationship continues when the enterprises are faithful to their intrinsic activities such as the improvement of productivity rather than the entrepreneur spirit. Such win-win cooperation was eventually shown as having a positive effect on the performance of enterprises.

• Journal of Engineering Education Research
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• v.25 no.5
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• pp.3-11
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• 2022

The effects and factors of the creativity education program on the creative self-efficacy of engineering college students were analyzed. As a result of the analysis, the creative self-efficacy of students who took the creativity education program was improved, and the effect was statistically significant. The learning contents factors affecting the improvement of creative self-efficacy was 'creativity development attribute and creative attitude' and the learning activity factor was 'taking theoretical lectures' about creativity.