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연속주조 공정에서 탕면 유동 소용돌이에 대한 수치해석 연구
박성배(Seoung Bae Bak),이종희(Jong Hui Lee),박일석(Il Seouk Park) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
Meniscus deformation is observed as dimple and vortex core. Especially, vortex core can entrain slag into a mold. It is called slag entrapment. Then, it can cause a surface defect like scab and blister. Until recently, Numerical analysis has been conducted by k-ε model to reproduce vortex phenomenon in the mold. Although k-ε model is wildly used to comprehend vortex, we presume that k-ε model is not a proper method in some cases. Because it can’t describe vortex core except roll cell. In the past, rotating cylinder model had studied as laminar assumption. As a result, vortex core had reproduced in free surface of two phases flow using water and air. So, we have guessed that laminar assumption will be more suitable in the mold. As a result, vortex depth is well coincided with experiment result. And, meniscus deformation is well reproduced.
신이식후 발생한 신발성(De Novo) 막증식성 사구체신염 1 예
김현철,박성배,조성수,박관규,허승호,장은숙 대한내과학회 1993 대한내과학회지 Vol.45 No.1
Three major types of glomerular changes have been described in human kidney allografts; transplant glomerulopathy, recurrent glomerulonephritis, de novo glomerulonephritis, De novo glomerulonephritis in the graft is an uncommon complication of renal transplantation and the most common histologic type is membranous glomerulonephritis. To the best of out knowledge, only two cases of de novo membrano-proliferative glomerulonephritis have been reported. On this paper, we are reporting the third case of de novo membrano-proliferative glomerulonephritis in a 39 year old male patient with previous polycystic kidney disease.