• Computational Structural Engineering : An International Journal
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• 제3권1호
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• pp.19-29
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• 2003

In the present study, finite element linear buckling analysis is performed for grid-stiffened composite plates. A hybrid element with drilling degrees of freedom is employed to reduce the effect of the sensitivity of mesh distortion and to match the degrees of freedom between skins and stiffeners. The preliminary static stress distribution is analyzed for the determination of accurate load distribution. Parametric study of grid structures is performed and three types of buckling modes are observed. The maximum limit of buckling load was found at the local skin-buckling mode. In order to maximize buckling loads, stiffened panels need to be designed to be buckled in skin-buckling mode.

• Child Health Nursing Research
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• 제23권2호
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• pp.190-198
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• 2017

Purpose: This study was conducted to define the concept of stress in siblings of childhood cancer patients. Methods: The hybrid model was used to perform the concept analysis of stress in childhood cancer patients' siblings. Through reviews of 16 studies in the theoretical phase and interviews with 20 siblings in the field phase, the derived results were brought together in the integration phase. Results: The concept of stress in siblings of patients with childhood cancer was found to have 6 attributes and 28 indicators in 3 domains. Personal factors included 2 attributes (fear about childhood cancer and immature coping skills), and family factors had 2 attributes (changes in relationships with family and changes in family environment), social factors had 2 attributes (changes in relationships with friends and in the school experience, and insufficient social support). Conclusion: The stress of siblings of childhood cancer patients was defined as a state of tension associated with personal, family, social factors that can be related to their siblings' childhood cancer. The findings in this study provide the base for the development of a tool for measuring siblings' stress and/or the development of nursing programs for these siblings.

• Journal of Plant Biotechnology
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• 제50권
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• pp.225-231
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• 2023

Cold stress is one of the most vulnerable environmental stresses that affect plant growth and crop yields. With the recent advancements in genetic approaches using Arabidopsis and other model systems, genes involved in cold-stress response have been identified and the key cold signaling factors have been characterized. Exposure to low-temperature stress triggers the activation of a set of genes known as cold regulatory (COR) genes. This activation process plays a crucial role in enhancing the resistance of plants to cold and freezing stress. The inducer of the C-repeatbinding factor (CBF) expression 1-CBF module (ICE1-CBF module) is a key cold signaling pathway regulator that enhances the expression of downstream COR genes; however, this signaling module in Panax ginseng remains elusive. Here, we identified cold-signaling-related genes, PgCBF1, PgCBF3, and PgICE1 and conducted functional genomic analysis with a heterologous system. We confirmed that the overexpression of cold- PgCBF3 in the cbf1/2/3 triple Arabidopsis mutant compensated for the cold stress-induced deficiency of COR15A and salt-stress tolerance. In addition, nuclearlocalized PgICE1 has evolutionarily conserved phosphorylation sites that are modulated by brassinsteroid insensitive 2 (PgBIN2) and sucrose non-fermenting 1 (SNF1)-related protein kinase 3 (PgSnRK3), with which it physically interacted in a yeast two-hybrid assay. Overall, our data reveal that the regulators identified in our study, PgICE1 and PgCBFs, are evolutionarily conserved in the P. ginseng genome and are functionally involved in cold and abiotic stress responses.

• 한국강구조학회 논문집
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• 제26권3호
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• pp.205-217
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• 2014

본 연구에서는 인장 플랜지에 HSB 고성능 강재를 적용한 강합성 복합단면 I-거더의 정모멘트에 대한 휨저항강도 및 연성 요구조건을 검토하였다. AASHTO LRFD 설계기준에서 강합성 거더의 정모멘트에 대한 공칭 휨저항강도 및 연성 요구조건은 소성모멘트와 소성 중립축을 이용하여 규정하고 있으며, 이때 소성모멘트와 소성중립축은 일반 강재에 대하여 유도된 값이다, 하지만 응력-변형률 거동에서 일반강재와 다르게 HSB 고성능 강재의 소성영역은 명확히 정의될 수 없다. 따라서 고성능 강재의 이상화된 응력-변형률 곡선을 통해 고성능 강재의 소성영역을 가정하여 소성모멘트를 정의하였으며, 다양한 치수를 갖는 임의의 단면에 대하여 수행된 수치 해석의 결과를 통해 인장 플랜지에 HSB 고성능 강재를 적용한 강합성 복합단면 I-거더의 연성 요구조건 및 공칭 휨저항강도 산정식을 제안하였다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2000년도 가을 학술발표회논문집(I)
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• pp.623-628
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• 2000

In this paper, the behavior for transfer girder of the upper-wall and lower-frame structures was studied by the nonlinear finite element analysis. It was analyzed and compared with the experimental results. Analysis results showed that failure modes were progressed by a initial diagonal crack in the shear span between the edges of the load and intermediate support plate. The nonlinear finite element analysis could predict deformation, principal stress, ultimate load and concrete crack. Also analysis results showed good agreement the test results.

• Journal of Welding and Joining
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• 제25권6호
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• pp.11-16
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• 2007

• Steel and Composite Structures
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• 제41권6호
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• pp.851-860
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• 2021

In this paper, a new approach of interface stress analysis in steel beam strengthened by porous FGM (Functionally Graded Materials) is presented to calculate the shear stress in the hybrid steel beam and loaded by a uniformly distributed load. The results show that there exists a high concentration of shear stress at the ends of the imperfect FGM, which might result in premature failure of the strengthening scheme at these locations. A parametric study has been conducted to investigate the sensitivity of interface behavior to parameters such as the rigidity of FGM plate (degree of homogeneity), the porosity index of FGM and the thickness of adhesive all were found to have a marked effect on the magnitude of maximum shear stress in the FGM member. we can conclude that the new approach is general in nature and may be applicable to all kinds of materials.

• 한국전산구조공학회논문집
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• 제16권2호
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• pp.165-172
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• 2003

본 연구에서는 축대칭 쉘구조물의 정동적해석을 효과적으로 수행할 수 있는 새로운 유한요소를 제안하였다. 본 유한요소는 축대칭 쉘의 전단변형률을 고려하였으며, 쉘의 경계에서 기술할 수 있는 변수들만으로 표현되는 효율적인 형태의 수정된 혼합 변분이론에 바탕하여 유한요소정식화를 수행하였다. 또한, 변위장에 대해 무절점 자유도를 추가적으로 도입하여 요소의 수치적 성능을 크게 향상시켰다 계산의 효율성을 위해, 요소정식화의 최종단계에서 정치조건으로부터 응력매개변수들을 제거하고, 동적축약을 통하여 무절점 자유도 성분들 또한 최종적인 유한요소방정식에서 제거되어짐으로써, 일반적인 변위기저 요소와 같은 크기의 유한요소방정식을 얻을 수 있다. 몇 가지 수치예제들에 대한 해석을 통하여, 무절점 자유도와 변위장에 일치하는 적절한 응력매개변수를 가지는 제안된 혼합 축대칭 쉘요소가 정동적해석에서 대단히 정확하고 효율적임을 확인할 수 있었다

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2002년도 춘계학술발표대회 논문집
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• pp.17-21
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• 2002

A finite element method based on the two-dimensional progressive failure analysis is presented for characterizing the strength and failure of the unidirectional-fabric hybrid laminated composite joints under pin loading. The 8-node laminated shell element is incorporated in the updated Lagrangian formulation. Various failure criteria including the maximum stress, Tsai-Wu, Yamada-Sun, and combinations of them are used in conjunction with the complete unloading stiffness degradation method. For the verification, joint tests are conducted for the specimens with various geometries. Although there are some differences depending on the geometry, the finite element model using the Yamada-Sun or the combined Yamada-Sun and Tsai-Wu criterion predicts the failure strength best.

• Steel and Composite Structures
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• 제21권1호
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• pp.177-194
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• 2016

The cable-supported ribbed beam composite slab structure (CBS) is a new type of pre-stressed hybrid structure. The standard construction method of CBS including five steps and two key phases are proposed in this paper. The theoretical analysis and experimental research on a 1:5 scaled model were carried out. First, the tensioning construction method based on deformation control was applied to pre-stress the cables. The research results indicate that the actual tensile force applied to the cable is slightly larger than the theoretical value, and the error is about 6.8%. Subsequently, three support dismantling schemes are discussed. Scheme one indicates that each span of CBS has certain level of mechanical independence such that the construction of a span is not significantly affected by the adjacent spans. It is shown that dismantling from the middle to the ends is an optimal support dismantling method. The experimental research also indicates that by using this method, the CBS behaves identically with the numerical analysis results during the construction and service.