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보일러 헤더의 잔여수명 평가 -크립 균열성장 거동에 의한 해석-
윤기봉 대한기계학회 1992 大韓機械學會誌 Vol.32 No.4
균열이 형성되어 있는 설비가 고온에서 정하중을 받으면, 크립 조건에서 균열이 성장하여 파손이 발생한다. 이 때 잔여수명 평가법을 설명하기 위해 발전소 헤더의 경우를 예로하여 잔여수명 평가절차, 이에 필요한 기초이론 및 Cr-Mo강의 관련 재료 물성 데이터 등을 설명하였다. 현재 국내발전소들이 노후화되어 잔여수명평가의 필요성이 증대되고 있으므로, 이 분야의 연구 및 기 술개발은 시급하고 중요한 과제라고 생각된다.
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유아기 자녀를 둔 남편의 양육참여 및 맞벌이 부부의 양육스트레스가 결혼만족도에 미치는 영향: 종단적 자기-상대방 효과
윤기봉,지연경 한국인간발달학회 2017 人間發達硏究 Vol.24 No.3
The purpose of this study was to examine the effects of father involvement and parenting stress on marital satisfaction of dual earner couples with preschoolers. Longitudinal dyadic data were drawn from parents with preschoolers from the 5th (2012) to 7th waves (2014) of the Panel Study of Korean Children. Paired t-tests, correlations, and structural equation modeling were employed to investigate the actor-partner effects for data analysis. Overall, wives had higher parenting stress and lower marital satisfaction than husbands; furthermore, when wives reported as such, their husbands followed the same pattern. While couples with greater parenting stress reported lower marital satisfaction showing significant actor effect, the partner effect was significant only for the negative effect of husbands' parenting stress on wives' marital satisfaction. In addition, husbands' parenting stress had larger effects on husbands' own marital satisfaction than the wives' parenting stress. Finally, greater husband involvement in parenting increased wives' marital satisfaction, which was mediated by wives' lower parenting stress. These longitudinal findings suggest that efforts should be directed toward alleviating parenting stress for husbands as well as wives to promote marital well-being among dual career families.
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윤기봉,장희철,김태국 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.7
In this study the modified weighted sum of gray gases model (WSGGM) using the gray gas regrouping technique and the discrete ordinates interpolation method (DOIM) are applied to analyze the radiative transfer within an irregular 3-D enclosure filled with non-gray gas mixture of CO2, H2O and N2. The computer code developed in this study is successfully applied for solving the non-gray gas radiation within a 3-D rectangular enclosure and the gray gas radiation within an irregular 3-D enclosure by showing fairly good agreements with the existing results. In this paper the radiative transfer within an irregular 3-D enclosure filled with non-isothermal non-gray gases with uniform mixtures of CO2, H2O and N2 is studied to demonstrate the applicability of the modified sum of gray gases model for irregular systems and to examine the effect of the concentrations of CO2 and H2O on the radiative transfer within modern combustors. Results show that the wall heat fluxes and the radiative heat source terms are increased as the concentrations of CO2 and H2O are increased. Results also show that the radiative fluxes caused by the mixture gases with high concentrations CO2 and H2O which can be observed in oxy-fuel combustion systems can reach up to nearly twice of those found in ordinary air-fuel combustion systems.
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아동․청소년의 신체증상 관련변인 연구-개인, 부모, 사회적 관계 변인 중심으로-
윤기봉,이사라 한국인간발달학회 2017 人間發達硏究 Vol.24 No.2
The purpose of this study was to investigate the effects of personal characteristics (sex, depression, social withdrawal), parental characteristics (parenting behavior), and social relations (peer relationship, teacher relationship) on somatic symptoms. This study analyzed 2,119 children in the 4th grade in elementary school and 2,080 adolescents in the 1st grade in high school by using the fourth-year panel data(2013) of the Korean Children and Youth Panel Survey (KCYPS). The collected data were analyzed using Pearson's correlation coefficients and hierarchical regression analysis using SPSS 23.0. The results are as follows. First, the somatic symptoms of children and adolescents were related to individual characteristics, parenting behavior, and social relations, and showed the highest correlation with individual variables. Second, the variables affecting the somatic symptoms of children were depression, social withdrawal, parental consistency, abuse, and teacher relationship. For adolescents, sexuality, depression and social withdrawal, parental supervision and abuse affected the somatic symptoms. The results of this study can be used as basic data to provide guidance for the counseling of children who complain about somatic symptoms at school and at home.
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재료의 소성 거동을 고려한 용접 계면균열의 Ct 매개변수
윤기봉,이진상,Yun, Gi-Bong,Lee, Jin-Sang 대한기계학회 2000 大韓機械學會論文集A Vol.24 No.3
In this study, behavior of $C_t$ which is a well-known fracture parameter characterizing creep crack growth rate, is investigated for weld interface cracks. Finite element analyses were per formed for a C(T) specimen under constant loading condition for elastic-plastic-creeping materials. In modeling C(T) geometry, an interface was employed along the crack plane which simulated the interface between weld and base metals. The $C_t$ versus time relations were obtained under various creep constant combinations and plastic constant combinations for weld and base metals, respectively. A unified $C_t$ versus time curve is obtained by normalizing $C_t$ with $C^*$ and t with $t_T$ for all the cases of material constant variations.
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