• Transactions of the Korean Society of Mechanical Engineers
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• v.19 no.5
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• pp.1259-1268
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• 1995

The stress distribution around micro holes and the behavior of stress interaction between micro holes are considerd in the study. Several conclusions are extracted as follows : (1) The stress interaction varies with the distance e between micro holes. When the two micro holes are spaced in such a manner that theri two closest points are separated by a distance of micro hole radius (e=1), stress distribution is affected by a opposite micro hole in all the closest region. In addition, if two closest points are seperated by twice the distance of a micro hole radius (e=2), stress distribution is affected by a opposite micro hole in the region of -0.8.leq.x/r.leq.0.8 and the interaction effect can be neglected for e=4. (2)If the depth becomes larger than the radius, or the radius varies, the shape and magnitude of stress distribution around micro holes varies. (3) Hoop stress around a micro hole for the two dimensional configuration is larger than that of the three dimensional micro hole located on the surface of material for .theta. < 60.deg., but it is reversed for .theta > 60.deg.

• Journal of the Korean Society of Safety
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• v.14 no.3
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• pp.25-32
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• 1999

This study has been performed to investigate the stress distribution around defects that behave as stress concentrators. Besides, the effect of stress interaction effects on the initiation of primary cracks were also investigated by rotary bending fatigue tests which were performed with specimens drilled micro surface defects and the stress distribution was analyzed using Finite Element Method. In addition, the stress interaction effects around defects and cracks were investigated by comparing the results of experiments and F.E.M. The results obtained are summarized as follows ; 1) Area which slip and micro cracks initiated at micro surface defects is between the maximum shear stress points and this area is over than ${\pm}30^{\circ}$ from the maximum stress point along the defect edge. 2) The stress interaction effect for the small size defect is larger than that of large size defect when the interval between them is near 3) Interval which there is no shear stress interaction effect analyzed by F.E.M. is larger than that of experimental results.

• Journal of Families and Better Life
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• v.25 no.1 s.85
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• pp.45-58
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• 2007

This study explored the impact of couple interaction behaviors on the relationship between economic stress and marital instability. The study results showed that economic satisfaction and economic pressure greatly influenced the marital instability of married males and females. However, the interaction behaviors of couples tended to have a stronger impact on marital instability than economic stress. In other words, perceived spouse support and perceived spouse hostility had a significant impact on marital instability, with perceived spouse hostility being the more damaging of the two. The study also showed that there were sender differences regarding the impact of couple interaction behaviors on marital instability and economic stress. For married males, economic satisfaction as well as couple interactions influenced significantly on their marital instability. For females the impact of couple interactions on their marital instability tended to be more salient. On the whole, the results of the interaction effects between economic stress and couple interaction behaviors on marital instability did not appear significant, except in the case of females' perceived spouse hostility and its effect on marital instability.

• Journal of the Korean Society for Precision Engineering
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• v.12 no.2
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• pp.154-161
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• 1995

In order to analysis of the stress distribution around flaws and the interaction effects between fatigue cracks, stress around micro hole was analyzed by Finite Element Method(F.E.M.) and micro hole specimens were tested using rotary bending fatigue machine and twisting fatigue machine to identify stress effects for fatigue cracks initiating from micro holes and interaction effects between micro holes. The results are as follows : Interaction effects of .sigma. $_{y}$for the micro hole side is larger than the large micro hole side when the interval between micro holes is near. Stress concentration factor increase as the diameter of micro hole becomes smaller. But, stress field of micro hole is smaller than that of large micro hole at h .leq. r (h:depth of micro hole, r:radius of micro hole) and that of large hole is larger than that of small micro hole at h >r expect the small range from micro hole.e.

• Korean Journal of Child Studies
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• v.26 no.5
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• pp.105-121
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• 2005

Data were collected from 120 teachers at 67 childcare centers in Seoul and Kyunggi-Do. The Assessment Scale for Day Care Programs(Rhee et ai., 2003) was used to observe teachers' interaction behaviors. Subjects responded to the teachers' job stress scale developed by the author and a modified version of teachers' efficacy scale based on the Science Teaching Efficacy Belief Instrument(Enochs & Riggs, 1990). Data were analyzed with descriptive statistics, Pearson correlations, and hierarchical regressions. Results showed that quality of teachers' interaction behaviors correlated negatively with teachers' job stress, and positively with teachers' personal efficacy; teachers' belief of efficacy moderated the relationship between job stress and teachers' interaction behaviors.

• Journal of the Korean Society for Precision Engineering
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• v.16 no.3 s.96
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• pp.145-153
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• 1999

This study has been performed to investigate the stress distribution around defects that behave as stress concentrators and fracture mechanical analysis for cracks initiatiating at stress concentrators. The stress distribution was analyzed using Finite Element Method and non dimensional stress intensity factor was determined by the mean stress method. In addition, stress interaction effects around defects and cracks were compared.

• Journal of Applied Reliability
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• v.17 no.1
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• pp.28-37
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• 2017

Purpose: This paper proposes a procedure that may infer and identify interaction failures in a module. Methods: In design FMEA, we defined an interaction model between components and proposed a method for selecting a single component by using the standard specification classification table and four methods for choosing the related components. We also introduced the function tree for function and requirement characteristic analysis and proposed utilization of standard stress lists and 1st and 2nd stress analysis tables to determine the effect the stress analysis has on interactions. Finally, the interaction mechanism diagram was proposed and used to infer the failure mechanism. Process FMEA also established procedures in a similar way. Results: We established a procedure for predicting the failure mode due to interaction between components based on Company A's multi-step FMEA procedure. Conclusion: By applying the proposed interaction FMEA procedure to the development model, we were able to confirm the effect of the new derivation on the failure mode of interaction, which was not predicted by the existing FMEA.

• Korean Journal of Human Ecology
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• v.21 no.4
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• pp.715-728
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• 2012

This research aims at examining the relationships between mother-toddler interaction and its related variables. A total of 49 toddlers and their mothers were participated and observed in the child lab during free play. The main results of this study are as follows. First, among the mother-toddler interaction, 'involvement' was frequently used in comparison with the 'rejection' was the hardly used in their interaction. Second, the mothers' sensitivity, parenting stress, and the mother-toddler interaction had no significant difference by the mothers' job status or gender of toddlers. However, their parenting stress was lower in working mothers or mothers who have girls. Third, mother-toddler interaction was significantly correlated with the mothers' sensitivity, parenting stress, parenting style, and the temperament of toddlers. On the basis of this results, the implication related to the variables influencing mother-toddler interaction was discussed.

• Child Health Nursing Research
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• v.23 no.4
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• pp.470-478
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• 2017

Purpose: This study was conducted to describe parenting stress in mothers of preschoolers who were born prematurely and to determine factors affecting parenting stress in child's problem behavior, mother-child interaction and parenting alliance. Methods: An exploratory survey study was conducted with 66 mothers of preschool children (5~6 years) with preterm births (PTB). Data were collected using Parenting Stress Index (PSI), Child Behavior Checklist (CBCL), Mother-Preschool Child Interaction Scale (MPIS), and Parenting Alliance Inventory (PAI). Results: Of the 66 mothers, 8(12.1%) showed high scores that were more than borderline for the PSI total score. In the multiple linear regression analysis, lower scores on the PAI (${\beta}=-.41$, p<.001), higher scores on the externalizing problem behavior of the CBCL (${\beta}=.40$, p=.001), and lower scores on the MPIS (${\beta}=-.21$, p=.043) were statistically significant contributors to maternal parenting stress. Conclusion: Findings indicate that mothers of PTB preschool children are at risk for parenting stress. Child's externalizing problem behavior, poor maternal-child interaction and parenting alliance were independent factors raising maternal parenting stress. More attention is needed on paternal parenting support, child's behavioral development, interaction with children for effective prevention and management of maternal parenting stress of PTB young children.

• Journal of applied mathematics & informatics
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• v.8 no.1
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• pp.59-69
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• 2001

The paper deals with the interaction between three Griffith cracks propagating under antiplane shear stress at the interface of two dissimilar infinite elastic half-spaces. The Fourier transform technique is used to reduce the elastodynamic problem to the solution of a set of integral equations which has been solved by using the finite Hilbert transform technique and Cooke’s result. The analytical expressions for the stress intensity factors at the crack tips are obtained. Numerical values of the interaction efect have been computed for and results show that interaction effects are either shielding or amplification depending on the location of each crack with respect to other and crack tip spacing. AMS Mathematics Subject Classification : 73M25.