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구조적 불연속에 기인하는 원통구조물의 응력집중현상에 관한 유한요소법에 의한 연구
김두만,정세헌 한국산업안전학회 1988 한국안전학회지 Vol.3 No.2
The stress concentration phenomena due to the structural incontinuty are studied by finite element method. In this study, a circular cylinder is treated. Under the axial load, the membrance action is dominate and the 24 D.O.F. cylindrical membrane finite element is used. The assembly of this element can successfully represent the original structure geometrically. The internal displacement function is such organized that the inter element compatibility condition is fully satisfied. In this study, the stress concentration factors due to the presence of a hole on the cylinder wall are obtained, and the factors versus the location of the hole is computed and plotted. It is found that the hole effect on the stress concentration disappears beyond the neighboring region of the hole size from the edge of the hole. Those results are useful for practical design in determining the region where the re-inforcing is necessary.
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김두만 대한의사협회 2017 대한의사협회지 Vol.60 No.12
Diabetes mellitus is characterized by hyperglycemia due to insulin deficiency and/or insulin resistance. Cardiovascular disease (CVD) is a major comorbidity of type 2 diabetes mellitus, and is the most common cause of death in people with diabetes mellitus. Several clinical trials have addressed the long-term effects of near-normoglycemia on CVD, but did not find evidence of an effect. However, some recent clinical trials of sodium glucose cotransporter 2 inhibitors (EMPA-REG [Empagliflozin Cardiovascular Outcomes and Mortality in Type 2 Diabetes Trial], CANVAS [Canagliflozin Cardiovascular Assessment Study]) or glucagon-like peptide-1 agonists (LEADER [Liraglutide Effect and Action in Diabetes: Evaluation of Cardiovascular Outcome Results-A Long Term Evaluation], SUSTAIN-6 [Trial to Evaluate Cardiovascular and Other Long-term Outcomes with Semaglutide in Subjects with Type 2 Diabetes]) showed very promising results regarding the prevention of CVD. In this review, I discuss some of these new antidiabetic agents and present clinical information regarding these drugs.
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Nonlinear 구성방정식을 이용한 트레드 고무블록의 접지압 해석
김두만,김용엽,박인정,유현승 한국 항공대학교 항공산업기술연구소 2000 航空宇宙産業技術硏究所 硏究誌 Vol.10 No.-
자동차용 트레드블록의 형상디자인을 위한 설계인자를 도출하고자, 해석적 방법과 실험을 통하여, 트레드블록 접지면에서의 접지압을 해석하였다. 본 연구에서는 더욱 복잡한 elastomer의 거동을 해석하고자, 비교적 간단하면서 large strain에서도 잘 맞는 것으로 알려진 Mooney-Rivlin Model을 제시하였으며, 접지압을 계산하여, Nonlinear elastic 거동 해석에 쓰이는 다른 몇몇 이론들과 비교, 검토하였다. 또한, 접지압 분포의 경향을 실험과 함께 분석함으로서, 실제 거동에 가장 적절한 Model을 제시하였다. To analyze the stress distribution on the contact surface of Tread block, and to provide the factor of design for the shape of tread block for automobile, the tread block has been analyzed the stress distribution on the surface of contact by analytical method and experiment. In this study, to analyse the contact stress on the elastomer, Mooney-Rivlin model has been suggested which is comparatively simple and well fit to the behavior of rubber-like materials. Also, Hooke's model and Neo-Hookean model were compared and investigated. The experiment was conducted to verify the results and we suggested the most efficient model to analyse the contact stresses of rubber block.
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