• Proceedings of the Korean Society for Environmental Edudation Conference
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• 2004.12a
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• pp.153-161
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• 2004

• Steel and Composite Structures
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• v.36 no.5
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• pp.569-586
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• 2020

The behavior of composite steel-concrete beams depends on the transmission of forces between two parts: the concrete slab and the steel I-beam. The shear connector is responsible for the interaction between these two parts. Recently, an alternative shear connector, called Truss Type connector, has been developed; it aligns efficient structural behavior, fast construction and implementation, and low cost when compared to conventional connectors applied in composite structures. However, there is still a lack of full understanding of the mechanical behavior of the Truss Type connector, due to its novelty. Thus, this study aims to analyze the influence of variation of geometric and physical parameters on the shear resistance of the Truss Type connector. In order to investigate those parameters, a non-linear finite element model, able to simulate push-out tests of Truss Type connectors, was specifically developed and validated with experimental results. A thorough parametric study, varying the height, the angle between rods, the diameter, and the concrete strength, was conducted to evaluate the shear resistance of the Truss Type connector. In addition, an equation to predict the resistance of the original Truss Type shear connector was proposed.

• Proceedings of the Korean Geotechical Society Conference
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• 2009.03a
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• pp.136-145
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• 2009

Factors influencing shear behavior of granular material include particle size, shape, distribution, relative density, particle crushing, etc. In this study, these factors are characterized by viewpoint of shear behavior using numerical analysis based on DEM. Geometrical particle shape is represented by a combination of small circular particles and influence of particle shape on crushing is studied through relative comparisons between clump (uncrushable) and cluster (crushable) models which are modeled using DEM. Also, particle shape is quantified by the dimensionless parameters such as circularity and convexity. The results indicate that particle shape indexes have a negative association with internal friction angle. Also, internal friction angle becomes reduced and failure envelop curve becomes nonlinear due to the particle crushing. It is also found that numerical results are quite good agreement with the experimental test conducted in this study.

• Steel and Composite Structures
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• v.43 no.4
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• pp.431-445
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• 2022

A double-skinned composite tubular (DSCT) column, which is an internally confined concrete-filled tubular column with a hollow section, has been developed for efficient use of materials that reduce self-weight and enhance seismic performance. It exhibits excellent material behavior with ductility owing to the confinement induced by outer and inner steel tubes. This study conducted axial compression tests considering the effects of steel tube thickness and hollow diameter ratios of DSCT columns on the material behavior of confined concrete under pure axial compression on concrete cores. From the axial compression tests, various combinations of outer and inner tube thicknesses and two different hollow section ratios were considered. Additionally, confined concrete material behavior, axial strength, failure modes, and ductility of DSCT columns were evaluated. Based on this study, it was concluded that the tests show a good correlation with peak strength and shapes of nonlinear stress-strain curves presented in literature; however, the thinner outer and inner steel tubes may reduce the ductility of DSCT columns when using thinner outer and inner tubes and higher confined stress levels. Finally, the minimum thickness requirements of the steel tubes for DSCT columns were discussed in terms of strength and ductility of test specimens.

• Journal of Korean Home Economics Education Association
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• v.26 no.2
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• pp.89-99
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• 2014

Purchasing behavior for upcycled fashion products was examined along with analysis on environment consciousness, clothing recycling behavior, interest in fashion and awareness of upcycling. Students from middle schools, general high schools and design high schools participated in this research from August to September in 2013. 732 questionnaires were analyzed by SPSS WIN. Firstly the levels of environmental consciousness, clothing recycling behavior and interest in fashion of students were high, low and mediate respectively. Female students showed higher environmental consciousness compared to male ones and clothing recycling behavior were found to be higher in students of design high schools than those of general ones. The level of interest in fashion was found to be higher in students of general high school than those of middle school, and this was higher in design high school students than those of general ones. Secondly, more than half of students were unaware of upcycling. Female students and students of design high schools were highly aware of upcycling. Students who were aware of upcycling showed high level of environmental consciousness, clothing recycling behaviour and interest in fashion. Thirdly, students had low experiences in purchasing upcycled fashion products and the reason was lack of awareness of upcycling. The reason that students purchased upcycled fashion products was the uniqueness and design. Students who purchased upcycled fashion products showed high environmental consciousness, clothing recycling behaviour, and interest in fashion.

• Journal of Korean Society of Forest Science
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• v.101 no.2
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• pp.259-265
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• 2012

The purpose of this study intends to suggest a basic information to establish protected area policy by analyzing environmental consciousness and environmental protection behavior of citizen after Hebei Spirit oil spill. During May-June of 2011, a total of 987 respondents completed at 5 major cities (Seoul, Busan, Daegu, Daejeon, Gwangju) in Korea. The result showed that more previous experience of environment as recognition of oil spill damaged area, volunteer activity experience, participation in the organization for environmental conservation, and participation in education program led to more positive attitude to environment. Therefore, the result of this study will contribute to manage protected area in balancing ecological conservation and utilization.

• Asia Pacific Journal of Business Review
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• v.6 no.1
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• pp.21-48
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• 2021

Promoting low carbon transportation adoption is important for energy saving. Some prior studies have discussed on environmental values affect low carbon transportation commuting is inconclusive. This study has constructed the environmental values, utility value, and social influence-based low-carbon transportation adoption model through the theory of the technology acceptance model and VBN model and the IS success model. Through the SEM model and stepwise regression analysis, we have found that environmental values positively affect utility value, and utility value also positively affects the behavior adoption of low carbon transportation. The utility value as mediating effect in the relationship between environmental values and low carbon transportation commuting behavior. Besides, we also have found that social influence positively impacts the behavior adoption of low carbon transportation. It better enhances the level of household residents' environmental values and utility values, and social influence for promoting the adoption of low carbon transportation. This present research provides theoretical guidance and suggestions for promoting the development of low-carbon transportation innovation.

• Hwankyungkyoyuk
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• v.19 no.3
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• pp.80-92
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• 2006

The purpose of this study was to make valuable suggestions for improving environmental education(EE) teaching materials. For the purpose of this study, we analyzed four secondary school EE textbooks in the perspective of environmental literacy components. The findings of this study are as follows: (1) As a whole, the EE textbooks tend to focus the understanding environmental knowledge much more than environmental activities. (2) In 'main text' domain of EE textbooks, environmental information, including environmental issue knowledge, is much more focused than environmental attitudes and behavior, including socio-political and environmental issue knowledge. (3) In 'graphic data' domain, environmental information about environmental issue knowledge was most prevalent. (4) Most learning activities focus on 'issue skill' component, rather than 'attitude' and 'action' component. (5) The objectives of EE in the 7th national Curriculum were not explicitly embedded in textbooks and too much is inclined toward 'knowledge' and 'skill'. Accordingly, it is necessary to develop 'module-type' EE textbooks to enable integrative EE. Also, it is suggested to develop specific strategies for linking environmental knowledge and attitude/behavior.

• Journal of The Korean Association For Science Education
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• v.23 no.6
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• pp.599-608
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• 2003

The purpose of this study was to investigate the effectiveness of NIE(newspaper in education) program in improving students' environmental knowledge, attitudes, and behavior. Whereas 92 tenth-grade girls were controlled as a lecture-type group, who were taught mostly with science textbooks, 95 tenth-grade girls were experimented as an NIE group, who actively utilized newspaper into classroom discussion. After 12 units were conducted in each group, girls of NIE group improved significantly more than those of lecture-type group in environmental knowledge, attitudes, and behavior. Such effectiveness of NIE learning commonly appeared throughout all achievement levels, except that environmental knowledge of lower-achieved girls did not show significant differences between two groups. This result proposes the need for active consideration of NIE learning in developing new environmental education program.

• The Journal of Korean Academic Society of Nursing Education
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• v.8 no.1
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• pp.61-71
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• 2002

purpose : The purpose of this study was to find out the influencing factors of smoking-cessation behavior of patients with coronary heart disease and to suggest the model of smoking-cessation behavior which was based on the relationship between influencing factors and then to test its fitness empirically. method : This study was based on the Theory of Reasoned Action and a hypothetical model was constructed with fifteen paths in consideration of main predictive factors of smoking-cessation behavior such as biological factor, disease-related characteristics, self-efficacy, supportive factor, environmental factor, disease-related perception factor, intention-to-quit, and psychological factor. The validity of a smoking- cessation model was tested to 264 patients with coronary heart disease by using SPSS 8.0 and Window LISREL 8.12a. results : 1. Seven of the 15 paths of smoking-cessation behavior proved to be significant. 2. The final model excluded three paths in the hypothetical model was demonstrated to be improved by $x^2$=44.31 (df=38, p=.22), Goodness of Fit Index (GFI)=.98, Adjusted Goodness of Fit Index (AGFI)=.96, Non-Normed Fit Index(NNFI)=1.00, Normed Fit Index(NFI)=1.00, and Root Mean Square Residual(RMR)=.24. 3.The smoking-cessation behavior was influenced directly by biological factor, self-efficacy, supportive factor, environmental factor, intention-to-quit, and psychological factor. The smoking-cessation behavior was accounted for 82% of variance by these factors. conclusion : although the adolescents' smoking behavior can be predicted by only smoking intention, it is hard to predict the adults' smoking-cessation behavior by only this factor. Therefore, intention-to-quit, self-efficacy, supportive factor should be improved because these are promotive factors for smoking-cessation behavior. Biological factor, environmental factor, and psychological factor are inhibitive factors, so nicotine replacement therapy is helpful to the high nicotine-dependents, and ex-smokers avoid other smokers in their environment and also patients should learn and practice the stress coping-skills.