• Transactions of the KSME C: Technology and Education
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• v.3 no.1
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• pp.37-44
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• 2015

In this paper dynamic deformation of lower hinge of refrigerator is simulated using dynamic finite element analysis while refrigerator is being dropped. The flow stress curves considering velocity dependency of hinge and lower packing material are determined through bending test and compression test at several dropping speeds. The determined material properties and flow stress from reverse engineering were used as input data for refrigerator's drop test using a dynamic finite element analysis software LS-DYNA. Additionally the result between CAE and 3D deformation measurement from real refrigerator drop test are compared and the result shows that the proposed analysis model is very useful to design lower hinge and lower packing endurable to the impulsive drop impact.

• Journal of the Society of Disaster Information
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• v.14 no.3
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• pp.305-314
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• 2018

Purpose: Dynamic Replacement Method currently lacks of sufficient research, implementation cases, and case histories, compared with other comparable methods, such as Dynamic Compaction Method. Method: In this study, for Dynamic Replacement Method, the effective improvement depth and improved strength were analyzed for silty clayey soils. Results: Testbed test was performed to verify the effectiveness of Dynamic Replacement Method followed by the main dynamic replacement implementation on real construction site. Conclusion: A The effects of changes of soft ground depth, dynamic replacements' diameter, depth, spacing, and applied energy on dynamic replacement efficiency in silty clays were assessed and the followings were found: Empirical coefficient for soil $n_R$ of Dynamic Replacement Method was within the range of 0.14~0.32 and its ${\sqrt{WH}}$ is recommended to be 1.25~2.5 times of those from Dynamic Compaction Method.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.49 no.8
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• pp.681-688
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• 2021

This paper considers the trajectory and impact point dispersion analysis of the test launch vehicle (TLV). The analysis, which performed before and after its flight test on November 28, 2018, is described and verified by comparing with the flight test results. The six degree-offreedom (DOF) simulation is used to compute the dispersion of the trajectory, attitude, and impact point, where the launch vehicle performance variations and wind effects during the atmospheric phase are included. The impact area to guarantee the flight safety is determined using the results of the dispersion analysis. The flight test results confirm that the safe flight of TLV is performed within the predicted dispersion boundary.

• Journal of the Korea Institute of Building Construction
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• v.19 no.4
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• pp.341-350
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• 2019

Construction industry is one of the most dangerous industry. As the construction accidents occur due to the repeated factors found in each accidents, there is a limitation in analyzing all types of occupational accidents by the existing descriptive analysis and statistical test. In this study, we classified safety accidents caused by falling objects among the accident types occurring at construction sites into fatal and nonfatal accidents and deduced the factors. In addition, we deduced the association rules among the safety accidents factors caused by falling objects through the association rule analysis method among the machine learning techniques. Therefore, considering the association rules for fatal and nonfatal accidents proposed in this study, it would be possible to prevent accidents by searching for countermeasures against safety accidents caused by falling objects.

• The Journal of the Korea Contents Association
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• v.21 no.4
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• pp.533-544
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• 2021

This study was focused on social stigma in utilizing community child centers which are selective child welfare institutions. The study model derived from the stress process model. The purpose of this research was to investigate the effects of stigma on happiness among children in community child centers and mediating effects of empowerment and community social capital as coping resources. The data were collected from 5, 6th grade students who are attending community child centers located in Daegu and Gyeongsan city. Data of 175 were analyzed and SPSS Process Macro and bootstrapping method were used. The results of the study were follows. First, stigma among children in community child centers showed significant direct effects on happiness. Second, empowerment and community social capital had significant mediating effects on the relationship between stigma and happiness. Based on the results, the policy and practice implications to improve happiness of children in community child centers were suggested.

• 월간낙농육우
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• v.29 no.7
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• pp.134-137
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• 2009

• The Bimonthly Magazine for Agrochemicals and Plant Protection
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• v.3 no.9
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• pp.92-95
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• 1982

• Environmental engineer
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• no.6 s.262
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• pp.38-41
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• 2008

• Proceedings of the Korean Fiber Society Conference
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• 1995.04a
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• pp.57-57
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• 1995

• Proceedings of the Korean Fiber Society Conference
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• 1995.04a
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• pp.58-58
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• 1995