• Geomechanics and Engineering
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• v.11 no.6
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• pp.805-820
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• 2016

A fully coupled non-linear effective stress response finite difference (FD) model is built to survey the counter-intuitive recent findings on the reliance of pore water pressure ratio on foundation contact pressure. Two alternative design scenarios for a benchmark problem are explored and contrasted in the light of construction emission rates using the EFFC-DFI methodology. A strain-hardening effective stress plasticity model is adopted to simulate the dynamic loading. A combination of input motions, contact pressure, initial vertical total pressure and distance to foundation centreline are employed, as model variables, to further investigate the control of permanent and variable actions on the residual pore pressure ratio. The model is verified against the Ghosh and Madabhushi high acceleration field test database. The outputs of this work are aimed to improve the current computer-aided seismic foundation design that relies on ground's packing state and consistency. The results confirm that on seismic excitation of shallow foundations, the likelihood of effective stress loss is greater in deeper depths and across free field. For the benchmark problem, adopting a shallow foundation system instead of piled foundation benefitted in a 75% less emission rate, a marked proportion of which is owed to reduced materials and haulage carbon cost.

• Korean Journal of Occupational Health Nursing
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• v.27 no.1
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• pp.36-47
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• 2018

Purpose: This study aimed to examine the effects of interpersonal relationship ability, job stress, and stress coping type on the turnover intention of nurses in the early stage of their careers. Methods: Data were collected from 136 early stage nurses from two general hospitals and one tertiary hospital in Chungbuk province. An early stage nurse was defined as the nurse with a work experience of 3 to 36 months. The collected data were analyzed using independent t-test, one-way ANOVA, Mann-Whitney U test, Person's correlation coefficient, and stepwise multiple regression. Results: It was seen that turnover intention had a negative correlation with interpersonal competency (r=-.20, p=.020) and a positive correlation with job stress (r=.56, p<.001). Job stress due to work over load, inadequate compensation and working environment, interpersonal relationship ability, and length of clinical career were significant factors influencing turnover intention (p<.05). These variables explained for 50.4% of the variance in turnover intention. Conclusion: It is necessary to develop an interpersonal relationship ability improvement program to decrease turnover intention among early stage nurses by helping them to successfully adapt to their job. Moreover, it is important to bring about continuous improvements in terms of provision of adequate workload and appropriate rewards, and creation of a suitable work environment to reduce the job stress of early stage nurses.

• Journal of the Korea Convergence Society
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• v.11 no.3
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• pp.301-310
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• 2020

A Convergence study was attempted to identify the effects of stress on Suicidal ideation and mediating effects of depression in the relationship. The study were 166 elderly's over 65 years at G city and period was from August 29 to September 9, 2018. Data were analyzed PASW 18.0 program. As a result, stress had a significant effect on depression in stage 1, stress had a significant effect on suicide ideation in stage 2, stress and depression of parameter were significant predictors in stage 3. The explanatory power of the two variables was 24.3% in stress, 26.8% for stress accompanied with depression, and the partial mediating effect of depression on the effect of stress on suicide ideation. Based on this study, it can be used as a basic data for reducing suicide ideation of the elderly and study is needed to develop suicide prevention programs.

• Journal of the Korea Convergence Society
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• v.12 no.7
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• pp.253-261
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• 2021

The purpose of this study was to examine the effects of mindfulness on the stress of university students' lives, and to verify that Positive Affect & Negative Affect have a moderating effect in the relationship between the two variables. The Mindful Attention Awareness Scale, Positive Affect & Negative Affect Schedule, and the life stress scale for college student were utilized for 243 female university students at K Women's University. First of all, Mindfulness of female university affected the stress of college students' lives. Second, Positive Affect did not have a moderating effect in the relationship between female college student's mindfulness and stress. Third, In the relationship between mindfulness and stress, female college students showed a moderating effect. In conclusion, female university students' awareness of mindfulness helped lower interpersonal stress, current task stress, and decreased Negative Affect. The discussion discussed the limitations of this study and the future direction of the study.

• Journal of computational fluids engineering
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• v.16 no.2
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• pp.11-16
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• 2011

Numerical analyses have been carried out to analyze the three-dimensional turbulent heat transfer by impingement jet on a concave surface with variation of geometric configurations. Three-dimensional Reynolds averaged Navier-stokes equations have been calculated using the shear stress transport turbulent model. The numerical results for heat transfer rate were validated in comparison with the experimental data. The distance between jet nozzles and angle of inclined jet nozzle were selected as the geometric variables. Area-averaged Nusselt numbers on concave surface are evaluated to find the characteristics of heat transfer with the two geometric variables. The heat transfer increases as the distance between jet nozzles increases, and the inclined impinging jets show much better heat transfer performance than the vertical impinging jet.

• Geomechanics and Engineering
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• v.21 no.5
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• pp.447-459
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• 2020

This paper aims to investigate the effect of rotation on a micropolar thermoelastic medium with voids problem. The problem is assessed according to three-phase-lag model. The normal mode analysis used to obtain the analytical expressions of the considered variables. The non-dimensional displacement, temperature, Micro rotation, the change in the volume fraction field, and stress of the material are obtained and illustrated graphically. Comparisons are made with the results predicted by two theories; namely three- phase-lag model (3PHL) and Green-Naghdi theory of type III (G-N III). The considered variables were plotted for different values of the rotation parameter, the phase-lag of heat flux and the phase-lag of temperature. The numerical results reveal that the rotation and the phase-lag times significantly influence the distribution of the field quantities. Some particular cases of interest are deduced from the present investigation.

• Smart Structures and Systems
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• v.13 no.3
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• pp.343-352
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• 2014

Given a body undergoing a stress-strain status as consequence of external excitations, sensors can be deployed on the accessible lateral surface of the body. The sensor readings are regarded as input of a numerical model of reduced order (i.e., the number of sensors is lower than the number of the state variables the full model would require). The goal is to locate the sensors in such a way to minimize the deviations from the response of the true (full) model. One adopts either accelerometers as sensors or devices reading relative displacements. Two applications are studied: a plane frame is first investigated; the focus is eventually on a 3D body.

• Journal of the Korean Home Economics Association
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• v.36 no.12
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• pp.145-160
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• 1998

The purpose of the study were two fokls: to investigate causes of wife abuse through both husbands and wives as the research subject and through ecological perspective as a theoretical framework. Data were collected using self-reporting questionnaires distributed to 400 couples in Seoul and Taegu. 280 questionnaires were used in the final analysis. The major findings of the study were summarized in the following. First, the percentage of samples who reported one or more instances of acts in each scale was 84.3%(236 couples). They reported having been a vicitm of abuse by their partners at least one instance in the preceding 12 months. Secondly, the hierarchical and stepwise regression yielded the result that wife abuse behavior by husbands was influenced by husband's microsytem(e.g.job stress, marital satisfaction, education level and occupation) and organism variables(e.g. husband's perceptions about the violence level of mass media, childhood observation of parental violence, childhood experience of the battering). These variables accounted for 38% of variance of wife abuse behavior among Korean husbands.

• The KSFM Journal of Fluid Machinery
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• v.16 no.6
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• pp.12-18
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• 2013

This paper presents the performance characteristics of a centrifugal blower using the design parameters of an impeller blade. Two design variables, the bending length from the blade trailing edge and bending angles of an impeller blade, are introduced to analyze the effects on the blower performance. Three-dimensional Navier-Stokes equations with shear stress transport turbulence model are introduced to analyze the performance and internal flow of the blower. Relatively good agreement between experimental measurements and numerical simulation at the design flow condition is obtained. Throughout present study, it is known that pressure increases as the bending length from the trailing edge and bending angle increase while efficiency decreases. But efficiency is decreased. Detailed flow field inside the centrifugal blower is also analyzed and compared.

• International Journal of Fluid Machinery and Systems
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• v.4 no.1
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• pp.172-178
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• 2011

This paper presents an optimization procedure for high-efficiency design of a mixed-flow pump. Optimization techniques based on a weighted-average surrogate model are used to optimize a vane diffuser of a mixed-flow pump. Validation of the numerical results is performed through experimental data for head, power and efficiency. Three-level full factorial design is used to generate nine design points within the design space. Three-dimensional Reynoldsaveraged Navier-Stokes equations with the shear stress transport turbulence model are discretized by using finite volume approximation and solved on hexahedral grids to evaluate the efficiency as the objective function. In order to reduce pressure loss in the vane diffuser, two variables defining the straight vane length ratio and the diffusion area ratio are selected as design variables in the present optimization. As the results of the design optimization, the efficiency at the design flow coefficient is improved by 7.05% and the off-design efficiencies are also improved in comparison with the reference design.