• Coupled systems mechanics
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• 제8권6호
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• pp.501-522
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• 2019

The present study is concerned with the thermoelastic interactions in a two dimensional axisymmetric problem in transversely isotropic thermoelastic solid using new modified couple stress theory without energy dissipation and with two temperatures. The Laplace and Hankel transforms have been employed to find the general solution to the field equations. Concentrated normal force, normal force over the circular region, concentrated thermal source and thermal source over the circular region have been taken to illustrate the application of the approach. The components of displacements, stress, couple stress and conductive temperature distribution are obtained in the transformed domain. The resulting quantities are obtained in the physical domain by using numerical inversion technique. The effect of two temperature varying by taking different values for the two temperature on the components of normal stress, tangential stress, conductive temperature and couple stress are depicted graphically.

• Coupled systems mechanics
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• 제11권3호
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• pp.199-215
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• 2022

The present paper deals with the axisymmetric deformation in homogeneousisotropic thermoelastic solid with two temperatures, with and without energy dissipation using modified couple stresstheory. The effect of energy dissipation and two temperature isstudied due to the concentrated normalforce, normalforce overthe circularregion, thermal pointsource and thermalsource over the circular region. The Laplace and Hankel transform techniques have been used to find the solution to the problem. The displacement components, conductive temperature distribution, stress components and couple stress are computed in the transformed domain and further calculated in the physical domain using numerical inversion techniques. Effects of two temperature and energy dissipation on the conductive temperature,stress components and couple stress are depicted graphically.

• Steel and Composite Structures
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• 제45권6호
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• pp.851-863
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• 2022

This research deals with the study of the Thomson heating effect in magneto-thermoelastic homogeneous isotropic rotating medium, influenced by linearly distributed load and as a result of modified couple stress theory. The charge density is taken as a function of the time of the induced electric current. The heat conduction equation with energy dissipation and with hyperbolic two-temperature (H2T) is used to formulate the model of the problem. Laplace and Fourier transforms are used to solve this mathematical model. Various components of displacement, temperature change, and axial stress as well as couple stress are obtained from the transformed domain. To get the solution in physical domain, numerical inversion techniques have been employed. The Thomson effect with GN (Green-Nagdhi) -III theory and Modified Couple Stress Theory (MCST) is shown graphically on the physical quantities.

• Steel and Composite Structures
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• 제51권2호
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• pp.103-116
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• 2024

Based on the consistent couple stress theory (CCST), we develop a unified formulation for analyzing the static bending and free vibration behaviors of functionally graded (FG) microscale beams (MBs). The strong forms of the CCST-based Euler-Bernoulli, Timoshenko, and Reddy beam theories, as well as the CCST-based sinusoidal, exponential, and hyperbolic shear deformation beam theories, can be obtained by assigning some specific shape functions of the shear deformations varying through the thickness direction of the FGMBs in the unified formulation. The above theories are thus included as special cases of the unified CCST. A comparative study between the results obtained using a variety of CCST-based beam theories and those obtained using their modified couple stress theory-based counterparts is carried out. The impacts of some essential factors on the deformation, stress, and natural frequency parameters of the FGMBs are examined, including the material length-scale parameter, the aspect ratio, and the material-property gradient index.

• 한국지역사회생활과학회지
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• 제20권1호
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• pp.71-80
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• 2009

This study aimed to identify and compare variables affecting life satisfaction of older women by focusing on household types and poverty levels. The study used data from the Korea Longitudinal Study of Aging administered by the Korea Labor Institute in 2006. The data for 1,017 older women ages over 65 including 427 single households and 590 couple households was analyzed. First, interaction effects of household types and poverty levels on life satisfaction were statistically significant. For the non-poverty households of older women, there was no explicit difference between single households and couple households in life satisfaction, but for the poverty households, single households were lower in life satisfaction than couple households. Second, as a result of reviewing four groups of older women (poverty-single household, poverty-couple household, non-poverty-single household, and non-poverty-couple household), besides religion, it was found that there were significant differences in age, education level, number of children, health level, residence area, and status of economic activity. Third, when analyzing variables affecting life satisfaction, common predictors for the four groups were health level and ownership of house. Older women who perceived to be healthier and owned their own homes were higher in life satisfaction. For poverty-single households, older women with over middle school graduation were also higher in life satisfaction, but for poverty-couple households, older women with over middle school graduation and more children were higher.

• 가정과삶의질연구
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• 제25권1호
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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.

• Structural Engineering and Mechanics
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• 제63권2호
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• pp.161-169
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• 2017

In this paper, using consistent couple stress theory and Hamilton's principle, the free vibration analysis of Euler-Bernoulli nano-beams made of bi-directional functionally graded materials (BDFGMs) with small scale effects are investigated. To the best of the researchers' knowledge, in the literature, there is no study carried out into consistent couple-stress theory for free vibration analysis of BDFGM nanostructures with arbitrary functions. In addition, in order to obtain small scale effects, the consistent couple-stress theory is also applied. These models can degenerate into the classical models if the material length scale parameter is taken to be zero. In this theory, the couple-tensor is skew-symmetric by adopting the skew-symmetric part of the rotation gradients as the curvature tensor. The material properties except Poisson's ratio are assumed to be graded in both axial and thickness directions, which it can vary according to an arbitrary function. The governing equations are obtained using the concept of Hamilton principle. Generalized differential quadrature method (GDQM) is used to solve the governing equations for various boundary conditions to obtain the natural frequencies of BDFG nano-beam. At the end, some numerical results are presented to study the effects of material length scale parameter, and inhomogeneity constant on natural frequency.

• 한국가족복지학
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• 제54호
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• pp.107-153
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• 2016

본 연구의 목적은 연상녀-연하남 부부의 결혼결정 경험과 과정을 알아보고, 연상녀-연하남 부부의 결혼결정 과정에 영향을 미치는 요인을 탐색하는 것이다. 이를 위하여 연상녀-연하남 부부인 30-40대 여성 11명을 대상으로 심층면접을 실시하였고, 자료 분석은 근거이론 방법을 적용하였다(Strauss and Corbin, 1998; Corbin and Strauss, 2008). 본 연구의 연구문제는 '연상녀-연하남 부부의 결혼결정 경험과 과정은 어떠한가?', '연상녀-연하남 부부의 결혼결정 과정에 영향을 미치는 요인은 무엇인가?'이다. 본 연구결과 78개의 개념들과 31개의 하위범주, 14개의 범주가 도출되었다. 중심현상으로 '친밀감과 불안의 양가감정'의 범주가 도출되었으며, 연상녀-연하남 부부의 결혼결정 과정은 '조정단계', '수용단계', '행동화단계'로 나타났다. 연상녀-연하남 부부의 결혼결정 과정의 핵심범주는 '다름의 편견을 넘어 신뢰로운 친밀함에 안착함'이었다. 연구결과와 논의를 토대로 연상녀-연하남 부부를 위한 전문적 조력개입 방안 및 실천적 함의를 제시하였다.

• 대한한방부인과학회지
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• 제26권2호
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• pp.151-165
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• 2013

Objectives: The purpose of this study is to investigate use condition of Korean medical institution and demand of Korean Medical Treatment Project of Infertility in infertile couple. Methods: Questionnaires were distributed to all members of the incorporated association AGAYA(http://www.agaya.org/) via e-mail and to infertile women who visited to Korean medicine OB & GY outpatient clinic of university Korean medicine hospitals of the country and an infertility specialized Korean medicine hospital. One hundred twenty four of completed questionnaires were analyzed. Results: 1. Korean medical institution utilization rate of infertile couple was 89.6% and was similar with western medical institution utilization rate of 87.1%. 2. 96.8% of infertile couple answered that Korean Medical Treatment Project of Infertility is necessary. And 90.3% of infertile couple answered that herbal medicines should be supported first of all. 3. 90.3% of infertile couple answered that they will participate if Korean Medical Treatment Project of Infertility go ahead. Conclusions: It was confirmed that most of the infertile couple have been received Korean medical treatment for infertility, and think that Korean Medical Treatment Project of Infertility is necessary.

• 한국지역사회생활과학회지
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• 제25권4호
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• pp.511-531
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• 2014

This study explores supportive and conflictual network structures of elderly single and couple households and analyzes the effects of supportive and conflictual networks on suicidal thoughts by gender and family type. The analysis considered a sample of 522 individuals over the age of 60 who did not live with their adult children. The statistical methods used to analyze data were descriptive statistics, a t-test, a chi-square test and a regression analysis using SPSS WIN 20.0. The results are as follows. First, men and elderly single households had support networks that were smaller than those of women and elderly couple households. The conflictual network of elderly couples households was larger than that of elderly single households. In addition, the larger the network, the more the conflictual was. Second, elderly single households thought about suicide more often than elderly couple households. Third, economic status, the number of adult children, the size of conflictual network and subjective health had considerable influence on suicidal thoughts of elderly single and couple households. The size of the conflictual network had a greater effect on suicidal thoughts of elderly individuals than that of the supportive network. These results have important policy implications for elderly single and couple households.