• Journal of Digital Convergence
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• v.20 no.2
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• pp.317-323
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• 2022

This study aimed to qualitative analyze the cusp variation pattern of the mandibular second premolars using a three-dimensional virtual models, and to analyze the left-right bilateral symmetry with a quantitative analysis of the tooth surface area according to the cusp variation. 127 virtual mandibular second premolars were prepared and individual absolute/relative cusp area, total crown area and groove form were analyzed using RapidForm2004(INUS technology INC, Seoul, Korea). Independent t-test, Kruskal-Wallis test and chi-square were performed. As a result, the groove form showed high bilateral symmetry between the left and right sides. Based on the left side of groove form, the bilateral symmetry was 100.0% for the U pattern, and 73.7% for the H patterned, and 78.9% for the Y pattern(p<.001). The finding could be as a meaningful reference for manufacturing CAD/CAM dental prostheses, and it is expected that further studies will be conducted on more samples including the mandibular second premolar immediately after eruption.

• Journal of Industrial Convergence
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• v.21 no.4
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• pp.91-100
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• 2023

This study was conducted to identify the effect of motive for major selection, major satisfaction on the nursing career commitment among senior nursing students. Data were collected from 215 nursing students and analyzed using t-test, ANOVA, Scheffé test, Pearson correlation analysis, and multiple regression analysis by SPSS ver. 29.0. As a result of this study, There were positive correlations between motive for major selection(r=.41, p<.001), major satisfaction(r=.35, p<.001), and nursing career commitment. The predictor on nursing career commitment was motive for major selection, explaining 39.4% (F=18.40, p<.001) of the variance. In conclusion, Through this study we found that motive for major selection has the greatest impact on nursing career commitment, it is necessary to seek educational new programs and curricula to develop nursing student's nursing career commitment.

• Journal of Service Research and Studies
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• v.13 no.1
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• pp.1-26
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• 2023

We analyze the effects and related factors of Smart Factory adoption. 110 and 325 samples were collected by median-size-industry matching method, respectively, of adopting and non-adopting companies. We use financial statement data (ROA, etc.) from the year before adoption to the fourth year after adoption. Abnormal operating performance and annual abnormal changes are obtained according to event study method, and analyzed by Wilcoxon signed-rank test and t-test. ROA and sales growth rate demonstrate short-term effects after adoption, but not long-term effects. As a result of regression analysis to examine if the three factors of labor intensity, R&D intensity, and prior financial performance have moderating effect, the moderating effect of R&D intensity and prior financial performance is confirmed. In addition, we perform regression analysis to confirm performance effects of early and late adoptions and whether prior financial performance and organization size have moderating effect. It is confirmed that the later the time of adoption, the greater the effect of adoption in the long term and the moderating effect of prior financial performance and organization size is confirmed.

• Journal of Convergence for Information Technology
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• v.12 no.2
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• pp.163-173
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• 2022

The purpose of this study is to explore risk factors affecting the oral health quality of life of non-medical hospital workers. As for the research method, a survey was conducted on 608 workers at hospitals in the metropolitan area from April 20 to July 30, 2021. As research tools, questions related to work loss, oral health status, and oral health quality of life were investigated. For the analysis methods, independent sample t-test, one-way ANOVA test, and hierarchical regression analysis were performed. As a result of controlling exogenous variables, gender(β=0.108), systemic disease(β=0.136), oral health level(β=0.201), and oral health status(β=0.463) were found to have an effect on the quality of life. Initiating regular oral health education for non-medical hospital workers will be of great help to promote oral health and work.

• Smart Media Journal
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• v.13 no.5
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• pp.62-71
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• 2024

This study conducted a team-based CPR simulation with 32 fourth-year emergency rescue students to determine the effectiveness of training feedback using body cameras used at emergency rescue sites, and measured awareness, training feedback effectiveness, and satisfactio+n before and after body camera feedback. , preferences and difficulties in using body camera devices were identified. Data analysis was performed using SPSS 27.0 program, including descriptive statistics, frequency analysis, paried t-test, and Wilcoxon signed rank test. As a result of the study, the perception of body camera use showed a positive change from 3.73±0.62 points to 4.45±0.54 points, and a positive satisfaction level of 3.98±0.51 was shown (p<.001). Additionally, there was a significant increase in self-check accuracy and performance score after body camera feedback (p<.001). Therefore, during team-based simulation resuscitation training, positive feedback effects in improving self-inspection ability and performance can be achieved by watching body camera videos and using self-checklists without direct feedback from the instructor.

• Journal of the Korea Society of Computer and Information
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• v.29 no.3
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• pp.155-163
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• 2024

This study was conducted to determine the relationship between nursing students' empathy, communication skills, and major immersion, and to identify factors that affect major immersion. The subjects of the study were 247 nursing students from one university in the G province, and data collection was conducted from November 20 to December 1, 2023. Data analysis was performed using SPSS 22.0 using descriptive statistics, t-test, one-way ANOVA, Scheffe test, Pearson correlation coefficient, and multiple regression analysis. The subject's empathy ability was 3.49 points, communication ability was 3.64 points, and major immersion was 3.61 points. Major immersion has a positive correlation with empathy and communication ability, and the factors affecting major immersion are major satisfaction and communication ability, with an explanatory power of 42.9%. To improve nursing students' immersion in their major, it is necessary to set the direction of learning activities and develop and apply various extracurricular programs.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.2
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• pp.822-826
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• 2012

This study practically analyzed the relationships of safety awareness and safety practice of the day-care teacher according to the presence of CCTV and in particular, made a practical analysis about whether safety awareness have mediation effects in the relationship between presence of CCTV and safety practice. As a result of T-test analysis, safety awareness and safety practice of the day-care teacher according to the presence of CCTV is different that has been verified. As a result of regression analysis, safety awareness were positively related to safety practice. That is to say, even the mediation effects that the presence of CCTV through safety awareness related to safety practice were verified. As a result, it was concluded that safety awareness factors didn't play mediator roles between presence of CCTV and safety practice.

• International Journal of Korean Welding Society
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• v.5 no.1
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• pp.60-65
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• 2005

In the field of welding the mechanical behavior of a welded structure under consideration may be predicted via heat transfer and welding residual stress analysis. Usually such numerical analyses are limited to small regular mesh models or test specimens. Nevertheless, there is very few strength assessment of the whole structure that includes the effect of welded residual stress. The present work is based on the specialized finite element codes for the calculation of nonlinear heat transfer details and residual stress including the external load on the welded RHS (Rectangular Hollow Section) T-joint connections of the whole structure. First the thermal history of the combined fillet and butt-welded T-joint equal width cold-formed RHS are calculated using nonlinear finite element analysis (FEA) considering the quarter model of the joint. Then using this thermal history the residual stress around the joints has been evaluated. To validity the FEA result, the calculated residual stresses were compared with the available experimental results. The residual stress obtained from the quarter model is mapped to the full model and then to the whole structure model using FEM codes. The results from the FEM codes were exported to the commercial package for visualization and further analysis applying loads and boundary conditions on the whole structure. The residual stress redistribution along with the external applied load is examined computationally.

• Structural Engineering and Mechanics
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• v.62 no.6
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• pp.663-674
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• 2017

This paper presents an approach for evaluating performance of prestressed concrete (PC) bridge girders exposed to fire. A finite element based numerical model for tracing the response of fire exposed T girders is developed in ANSYS. The analysis is carried out in three stages, namely, fire temperature calculation, cross sectional temperature evaluation, and then strength, deformation and effective prestress analysis on girders exposed to elevated temperatures. The applicability of the computer program in tracing the response of PC bridge girders from the initial preloading stage to failure stage, due to combined effects of fire and structure loading, is demonstrated through a case study, and validated by test data of a scaled PC box girder under ISO834 fire condition. Results from the case study show that fire severity has a significant influence on the fire resistance of PC T girders and hydrocarbon fire is most dangerous for the girder. The prestress loss caused by elevated temperature is about 10% under hydrocarbon fire till the girder failure, which can lead to the increase in deflection of the PC girder. The rate of deflection failure criterion is suggested to determine the failure of PC T girder under fire.

• Journal of Korean Home Economics Education Association
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• v.12 no.1
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• pp.11-20
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• 2000

The purpose of this study was to investigate the correlations between the school neighorhood environment and adolescents’behaviors. A questionnare was distributed to 221 high school students from June 27. 1997 t해 July 16. 1997 in chonju. In this study SAS package was used. The statistical methods such as frequency. mean. analysis of variance. correlation analysis. multiple regression analysis and T-Test were applied. The result of this study were as follows. 1) The school neighborhood environment of B high school included much more problematic places than A high school in 20 minutes distance on foot. So B high school students visited problematic places more frequently than A high school students(p<.05). 2) Both of A high school students and B high school students didn’t be satisfied about the school neighborhood environment. The degree of satisfaction for school environment of A high school student was higher than that of B. (p<.001) The number of benefit facilities. the degree of cleanness, and the safety from automobiles positively influenced the satisfaction for school neighbor environment. while the number and visiting of harm facilities negatively in satisfaction. 3)The problematic behaviors of B high school students was higher than A high school students(p<.05)