• Nuclear Engineering and Technology
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• v.54 no.9
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• pp.3415-3421
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• 2022

This paper is aimed to find out the impact of the geometrical parameters, mainly the radius and the height of a cylinder, on the SGEMP response including the famous scaling law in the classical cylinder model using a homemade PIC code UNIPIC-3D. We computed the electric fields at the center and at the edge on the emission head face with different radii and heights under normal X-rays incidence. The results show that the electric field will increase with the radius but decrease with the height. We analyze the scaling law that links the electric field product and fluence product, and whereafter an irreconcilable contradiction raises when the radius is changeable, which limits the application range of the scaling law. Moreover, the field-height-radius relation is found and described by a combination of logarithmic and minus one-quarter numerical fitting law firstly. Particle and magnetic field distributions are used to explain all the behaviors of the fields reasonably. All the findings will assist the evaluation of SGEMP response in spacecraft protection.

• Asia Marketing Journal
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• v.24 no.3
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• pp.109-120
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• 2022

The COVID-19 lockdown has had an unprecedented impact on people in various ways. This study evaluates the effect of lockdown repeal from both marketing and public-policy perspectives. Combining the Bayesian multilevel model with the difference-in-differences design, we find that a lockdown repeal has had a negative impact on socialization. Furthermore, the results show that those who have a low level of risk perception are less affected by lockdown repeal. Also, the negative effect of lockdown repeal varies depending on past socialization behaviors; that is, the lockdown-repeal effect is attenuated for those who socialized more than others in the past. Our findings contribute to the intersection of public policy and marketing literature and provide both academic and practical implications.

• Korean Journal of Artificial Intelligence
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• v.12 no.2
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• pp.25-33
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• 2024

This study examines the relationship between customer satisfaction and management response in the hotel industry amid the COVID-19 pandemic. By applying regression analysis and topic modeling to consumer reviews on online platforms, we assess how consumer perceptions and management behaviors have shifted since the onset of the pandemic. The findings reveal a significant decline in customer satisfaction linked to COVID-19. Significantly, while the pandemic has reduced overall customer satisfaction levels, high response rates and high review-response content similarity mitigate the impact of the crises. These results highlight the critical need for hotel managers to continuously monitor online reviews and adapt their engagement strategies to maintain and enhance customer satisfaction during ongoing and future crises. This research not only corroborates existing theories on customer satisfaction but also exposes novel dynamics introduced by the pandemic, offering new insights for effective customer relationship management in turbulent times.

• Journal of Korea Society of Industrial Information Systems
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• v.23 no.3
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• pp.143-159
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• 2018

In a changing environment of parallel management, members must respond more flexibly to customers and have the maximum service spirit, which makes servant leadership more important than the existing leadership style. This study will examine the impact of servant leadership on trust toward supervisor and the impact of trust toward supervisor on change-oriented behaviors and job exhaustion. Finally, this study will also analyze the moderating effect of organizational support in the relationship between servant leadership and trust toward supervisor. A survey questionnaire was conducted on nurses in university hospitals and general hospitals located in Busan. First, growth support, community building, and stewardship among servant leadership had a positively significant influence on trust toward supervisor but did not significantly influenced vision suggestion. Second, trust toward supervisor had a positively significant influence on change-oriented behaviors. Third, trust toward supervisor had a negatively significant influence on job exhaustion. Fourth, the interaction effect between the independent variable stewardship and moderating variable organizational support was significant on the dependent variable trust toward supervisor, but interaction effect between the independent variables that were vision suggestion, growth building, and community building and moderating variable organizational support was not significant.

• Korean Security Journal
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• no.29
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• pp.115-137
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• 2011

The purpose of this study was to look into impacts of career barriers and college major satisfactions on career preparation behaviors of Security major college students. The subjects of this study were collected among 200 security major students attending universities in Choungnam and Junnam Provinces, and 170 out of 200 were analyzed. Based on collected data, exploratory factor analysis, correlation analysis, multiple regression analysis, and one-way ANOVA were conducted using SPSS 18.0. According to the result, career barriers showed negative correlations on career preparation behaviors, and self-concept clarity deficiency showed significant impact on it. College major satisfactions showed positive correlations, and major satisfaction showed significant impact on it. Also result shows college junior and senior students experience less career barriers compare to freshman and sophomore students, and college junior and senior students were more satisfied on the college major satisfactions as well. The study has found important implications of impacts of career barriers and college major satisfaction on career preparation behaviors. In long term, the finding of the study seem to provide useful insights for security major students and Human Resource Personnel to execute the process of career preparations and related counseling effectively.

• Proceedings of the Korea Concrete Institute Conference
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• 1999.10a
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• pp.593-596
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• 1999

Steel fibers are added to concrete to improve energy absorption, impact resistance and apparent ductility, and to provide crack resistance and crack control. This study is to investigate the toughness index and post-crack equivalent tensile strength of steel fiber reinforced concrete properties on the load-deflection behaviors of the steel fiber reinforced concrete beam model specimens.

• 한국가스학회:학술대회논문집
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• 1999.09a
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• pp.100-107
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• 1999

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2002.10a
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• pp.849-853
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• 2002

A specific experimental method, the split Hopkinson pressure bar (SHPB) technique has been widely used to determine the dynamic material properties under the impact compressive loading conditions with strain-rate of the order of 103/s~104/s. In this paper, dynamic deformation behaviors of rubber materials widely used for the isolation of vibration from varying structures under dynamic loading are determined using a Split Hopkinson Pressure Bar technique.

• Proceedings of the KSR Conference
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• 2005.11a
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• pp.1248-1253
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• 2005

The study is indispensable for the dynamic behaviors because this Cable-stayed long span bridge ; has a more flexible structure than normal bridge can have weaknesses which are impact factor, deflection and defectives etc. This study analyze the dynamic behavior by an analysis of the moving constant train force on railway with Midas/Civil that is a commercial finite element analysis tool about Extradosed PSC Bridge. Also it will be checked the dynamic behavior features and standard of the dynamic capability.

• Health Policy and Management
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• v.26 no.1
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• pp.24-29
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• 2016

Background: Socio-economical status, represented by poverty, is a potent factor in predicting health status, because preventable illness and death occurs due to poverty and socio-economical situation. This study aims to provide information towards on the correlation between poverty and self-rated health in consideration of elements of health behaviors and family and friend support in Philippines. Methods: Data was collected on 15th to 28th of February 2011 by using structured questionnaire through interview method. Study area is Antipolo and Tondo in Manila, Philippines. Sample size was 1,100 but only 658 cases was analyzed due to incomplete questionnaire. Results: Results show that the poverty has direct negative influence on self-rated health, while the presence of family and friend support decreased negative influence. And through the analysis of mediated moderation model, similarly poverty has also indirect negative effect on self-rated health by health behaviors and family and friend support. Especially, regular exercise was found to be a major variable that mediates poverty and self-rated health. Conclusion: In conclusion, to improve the self-rated health state of respondents need to provide emotional support especially from family and friends. Also regular exercise should be encouraged by raising health awareness through continuous health education and promotion for the residents in order to develop health behaviors.