• Structural Engineering and Mechanics
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• v.91 no.3
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• pp.251-262
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• 2024

Numerical modeling using the finite element method (FEM) offers crucial insights into the mechanical behavior of prostheses, including stress and strain distribution, load transfer, and stress intensity factors. Analyzing cracking in PMMA surgical cement (polymethylmethacrylate) for total hip prostheses (THP) is essential for understanding the loosening phenomenon, as the rupture of orthopedic cement is a primary cause. By understanding various failure mechanisms, significant advancements in cemented total prostheses can be achieved. This study performed a numerical analysis using a 3D FEM model to evaluate stress levels in different THP models, aiming to model damage in the orthopedic cement used in total hip arthroplasty. Utilizing ABAQUS software, FEM, and XFEM, the damage in three types of THPs-Charnley (CMK3), Osteal (BM3), and THOMPSON was modeled under stumbling loading conditions. XFEM allowed for the consideration of crack propagation between the cement and bone, while the GEARING criterion employed a user-defined field subroutine to model damage parameters. The study's findings can contribute to improving implant fixation techniques and preventing postoperative complications in orthopedic surgery.

• International Journal of Railway
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• v.5 no.2
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• pp.89-92
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• 2012

Effective notch stress, as an approach to evaluate the local stress at a notch (weld toe or root), is defined as the total stress assuming linear-elastic material behavior. This method can be effectively used to evaluate the fatigue performance of welded joints. In this study, finite element analysis results using the effective notch stress method were correlated with fatigue test results of rib-to-deck welded joints in a steel orthotropic bridge deck. Effective notch stress approach provided a good correlation with the crack pattern observed in the full-scale fatigue test. A higher effective notch stress at the critical weld toe than at the weld root was consistent with the dominant crack pattern observed at the weld toe during testing. The effective notch stress at the toe on the deck plate was about 80% higher than that on the rib; no cracks at the weld toe on the rib in the testing were observed. Maximum effective notch stress at the weld root occurred on the upper side of the root notch, which indicates that cracks are more likely to propagate into the deck plate, not into the weld metal. This is also consistent with the observed crack pattern in which the crack from the root propagated upward into the deck plate. No such crack pattern, propagating into the weld metal, was observed in the testing.

• The Korean Journal of Community Living Science
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• v.26 no.1
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• pp.177-189
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• 2015

This study investigates the effects of economic factors on happiness in terms of life satisfaction, one of the most important goals in human life, and examines the moderating role of financial management in the effect of financial stress. Data were collected total 341 individuals in Daejeon, Korea(235 college students and 105 women). The factors influencing life satisfaction were analyzed multiple regression analysis. Effects of moderating variables were tested hierarchical regression analysis. Subjective financial stress was related to both individualistic happiness and collectivistic happiness, whereas objective financial stress had a negative effect only on collectivistic happiness. Financial management (specifically control of expenditure behaviors) had positive effects on both individualistic happiness and collectivistic happiness. Financial management moderated the relationship between financial stress and happiness. The results have important implications.

• Journal of the Korean Society of Industry Convergence
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• v.7 no.1
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• pp.83-89
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• 2004

The analysis about consolidation characteristic in soft clay has been depending one-dimension consolidation analysis. but, drain and undrain zone are explicated as homogeneous by consolidation behavior following consoli- dated settlementsoft in soft clay. 1) Established sand drain in soft clay in many types, and measured water content, unconfined compression strength, vertical stress, horizontal stress, vertical settlement, pore water pressure. 2) Arranged the result from the test and numerically explicated effective stress, total stress, and effective stress path at the drain and undrain zone. 3) We also analyzed and comparied elastic and elastic-plastic in soft clay using measured data. The result analyzed does not approach to a special theory, but, it is well in accord with the result of other investigator's study in the same condition.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.21 no.1
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• pp.21-25
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• 2012

In this study, the safest model can be selected by the simulation result of structural safety analysis according to the shape of impact bar affected at side door of automobile. The open sectional model of semicircle type has the lowest deformation and stress among 4 kinds of models. As the weight of this model has 30% in comparison with other models, it becomes most economical and stable. As the open sectional model of cap type the highest deformation and stress among 4 kinds of models, it becomes weakest. The closed models with circular and rectangular types has the stress far lower than cap type. The maximum deformation is shown at the center part of impact bar but the maximum stress occurs at the joint part between impact bar and frame.

• Journal of the Korean Society of Mechanical Technology
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• v.13 no.4
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• pp.15-21
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• 2011

The safety at this study is investigated by flow or stress analyses due to configuration or installation direction of fuel tank in the existing CNG bus. In case of the lower ceiling with sharp type, the equivalent stress due to the explosion of fuel tank is less than the type of flat or arc. it becomes safer on passenger. In case of the installation direction of fuel tank in the existing CNG bus, the stress applied on the lower ceiling at transverse direction becomes less than at longitudinal direction. It is more stable on the safety of passenger. The harm on the explosion accident can be prevented by use of the analysis result at this study.

• Child Health Nursing Research
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• v.30 no.1
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• pp.7-16
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• 2024

Purpose: Children with cerebral palsy (CP) and their parents experience various problems that can affect their quality of life. This study examined factors affecting the quality of life of children with CP. Methods: A cross-sectional study was conducted in Yogyakarta, Indonesia, from January to August 2019. The participants were consecutively recruited children with CP aged 2 to 18 years and their parents. Ninety-eight children with CP and their parents, specifically their mothers, were recruited. Children's health-related quality of life (HRQoL) was measured using the Pediatrics Quality of Life Cerebral Palsy. Parental HRQoL and stress were measured using the WHOQOL-BREF and Parenting Stress Index (PSI). Results: Functional level V was the most common category for both Gross Motor Function Classification System (GMFCS) and Bimanual Fine Motor Function (BFMF) (35% and 28%, respectively). Children's mean HRQoL was medium (49.81±20.35). The mean total PSI score was high (94.93±17.02), and 64% of parents experienced severe stress. Bivariate analysis showed that GMFCS, BFMF, number of comorbidities, presence of pain, and parental stress were significantly correlated with the total score for children's HRQoL (p<.05). Multiple linear regression analysis (p<.05) demonstrated that more severe GMFCS and parental stress were associated with lower mean HRQoL scores in children. Conclusion: Factors including the level of GMFCS and parental stress affected the HRQoL of children with CP. Parental stress management should be included in the comprehensive management of these children.

• Journal of the Korean Institute of Gas
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• v.19 no.1
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• pp.23-27
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• 2015

The stress and deformation behavior safeties of cylindrical hollow rollers have been analyzed by the finite element method, and investigated for over design capability based on the computed results. According to the stress analysis result which is related to the strength of a hollow roller, the maximum stress of 39.8MPa in which is operated near the bearing for supporting a hollow roller structure is overestimated design as 15.9% level compared with a yield strength, 250MPa of a steel material. And the maximum deformation of 0.032mm in which is operated at the middle span of a total length of cylindrical hollow rollers is very small and sufficiently safe compared with a total length and a thickness of a hollow roller. Thus, the FEM computed results for a stress and deformation indicate that a current FEM analysis model of cylindrical hollow rollers is over designed.

• Journal of Digital Convergence
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• v.19 no.11
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• pp.247-253
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• 2021

The purpose of this study was to investigate the mediating effect of hope between authentic leadership and job stress of office workers. For this purpose, a total of 27 workplaces located in Gyeonggi, Chungnam and Chungbuk Province were selected and surveyed, and a total of 295 copies of the collected questionnaires were analyzed excluding the unfaithful responses. Correlation analysis and Baron & Kenny's regression analysis of mediating effects were performed on the collected data. The results of this study are as follows. First, there was a significant positive correlation between authentic leadership and hope-agency thinking and hope-path thinking, excluding job stress. Second, as a result of the mediating effect regression analysis, the mediating effect of hope was identified between authentic leadership and job stress. Finally, based on this study, measures to reduce the job stress of office workers were discussed, and program development and policies using hope were specifically suggested.

• Culinary science and hospitality research
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• v.24 no.3
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• pp.133-143
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• 2018

The purposes of this study was to investigate how interpersonal relationship stress had the impact on job attitude and turnover intention. To perform this study, total 420 questionnaire were distributed to regular hotel employees from October 16th to November 26th in 2017. Unworkable data were excluded, and final 344 usable responses were obtained for an empirical analysis. Frequency analysis, exploratory factor analysis, reliability analysis, correlation analysis and regression analysis were measured by using SPSS 18.0, respectively. For the study structure, interpersonal relationship stress primarily concentrated on the boss/staff/colleague/customer stress. Job attitude was divided into organization commitment and job satisfaction. Transfer intention was a single factor. The results of this study were shown as follows: Hypothesis 1, boss/customer stress have a negative effect on organization commitment and boss/colleague/customer stress have a negative effect on job satisfaction. Hypothesis 2, boss/customer stress have a positive effect on transfer intention. Hypothesis 3, tissue commitment have a negative effect on transfer intention. This results of this study have shown that stress management of employee is a source of management result in hotel business. This study have given to the hotel's human resource management and internal marketing for the practical implication and academical use.