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미시역학적 접근 방법에 의한 복합소재 적층 쉘 구조의 유한요소 변위 및 응력해석
이상열,Lee. Sang-Youl 한국방재학회 2014 한국방재학회논문집 Vol.14 No.1
본 연구는 복합소재 적층 쉘 구조에 대하여 마이크로 역학 접근방법에 의한 섬유의 함침비율 변화에 따라 탄성계수를 예측하고 매크로 역학 기반으로 정적 거동 특성을 분석하였다. 본 연구에서 제시하는 멀티 스케일 접근법에 의한 유한요소 모델은 해석의 정확성과 재료들 간의 상관관계를 상세하고 정확이 보여준다는 장점이 있다. 수치해석은 적층 갯수, 적층배열, 섬유함침비율의 변화에 따른 최대 변위 및 응력 변화를 분석하는데 중점을 두고 있다. 수치예제로부터 섬유와 모재의 재료비율은 거시적 구조 거동 특성에 중요한 영향을 주고 있음을 알 수 있었다. 본 연구는 변위 및 응력에 영향을 미치는 최적의 섬유와 모재 재료비율을 상세 분석하였으며, 해석 결과는 건설용으로서의 복합소재 기둥구조가 경제적이면서 우수한 구조 성능을 만족하도록 설계하는데 기여할 수 있을 것으로 기대된다. This study carried out finite element deflection and stress analysis of laminated composite shells, which is based on the micro-mechanical approach for different fiber-volume fractions. The finite element (FE) models for composite structures using multi-scale approaches described in this paper is attractive not only because it shows excellent accuracy in analysis but also it shows the effect of the material combination. The FE model is used for studying static behaviors of laminated composite shells for various fiber-volume fractions. In particular, new results reported in this paper are focused on the significant effects of the fiber-volume fraction for various parameters, such as fiber angles, layup sequences, and length-thickness ratios. It may be concluded from this study that the combination effect of fiber and matrix, largely governing the structural performance of composite structures, should not be neglected and thus the optimal combination could be used to design such civil structures.
유한차분법을 이용한 복합적층 원형곡선요소의 평면응력문제 연구
이상열,임성순,장석윤,Lee, Sang Youl,Yhim, Sung Soon,Chang, Suk Yoon 한국강구조학회 1997 韓國鋼構造學會 論文集 Vol.9 No.1
Composite materials are consist of two or more different materials to produce desirable properties for structural strength. Because of their superiority in strength, corrosion resistance, and weight reduction, they are used extensively as structural members. The objective of this study is to present the effectivness of the laminated composite elements by analyzing in-plane displacement and stress of the anisotropic laminated annular elements. Anisotropic laminated structures are very difficult to analyze and apply, compared with isotropic and orthotropic cases for arbitrary boundaries and fiber angle -ply. Boundary conditions for the examples used in this study consist of two opposite edges clamped and the other two edges free, and finite difference method is used in this study for numerical analysis. From the numerical result, it is found that the program used in this study can be used to obtain the displacement of the straight beams considering it's transverse shear deformation as well as anisotropic laminated elements. Several numerical examples show the advantages of the stiffness increase when the angle-ply composite materials are used. Therefore it gives a guide in deciding how to make use of fiber's angle for the subtended angle, load cases, and boundary conditions.
이상열,허승호,정재걸,장연규,길승배,Lee, Sang-Youl,Heo, Seung-Ho,Chung, Jae-Gul,Jang, Yeon-Gyu,Gill, Seung-Bae 대한신경외과학회 2001 Journal of Korean neurosurgical society Vol.30 No.2
A 69-year-old woman presented with right abducent nerve paresis caused by an ectopic pituitary adenoma invading the posterior wall of the sphenoid sinus. The tumor was removed via transsphenoidal approach. The histological diagnosis was invasive pituitary adenoma with bony destruction. The symptom was improved without complication. The authors present a rare case of ectopic pituitary adenoma with a literature review.
H2-M3의 세포 표면 발현이 NK 세포의 활성에 미치는 영향 분석
이상열,전태훈,Lee, Sang-Yeol,Chun, Tae-Hoon 대한약학회 2009 약학회지 Vol.53 No.3
H2-M3 (M3) is a unique antigen presenting molecule which provides N-formylated peptide to certain type of T cells. Previous observation indicated that NK cell activity is significantly diminished during listerial infection in $H2-M3^{-/-}$ mice. To explore the possibility that M3 expression directly effect on NK cell activity, we measured NK cell activity with or without stimulation of N-formylated peptide on antigen presenting cells. Results indicated that the expression of M3 is not directly influence on NK cell activity. Further study will be focused on the indirect effect of M3 on regulating NK cell activity.
$GABA_A$-Benzodiazepine 수용체 이상과 불안장애
이상열,박민철,강희자,Lee Sang-Yeol,Park Min-Cheol,Kang He-Ja 대한불안의학회 2005 대한불안의학회지 Vol.1 No.1
In the 40 years since the first benzodiazepine was brought into clinical use there has been a substantial growth in understanding the molecular basis of action of these drugs and the role of their receptors in anxiety disorders. Benzodiazepine receptors are present throughout the brain with the highest concentration in cortex, and it potentiate and prolong the synaptic action of the inhibitory neurotransmitter GABA. Central benzodiazepine receptors and $GABA_A$ receptors are part of the same macromolecular complex. Abnormalities of these $GABA_A$-benzodiazepine receptors as a result of drug challenge tests and neuroimaging studies may underlie some anxiety disorders. The role of $GABA_A$-benzodiazepine receptors in the action of benzodiazepine and as a factor in anxiety disorder, in both animal and humans including knock-out and knock in technique, may lead to new anxiolytics that have potentially significant therapeutic gains without unwanted side effects.