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서창희(C. H. Suh),이락규(R. G. Lee),정윤철(Y-C. Jung),박종규(J. K. Park),김양수(Y. S. Kim),김영석(Y. S. Kim) 한국소성가공학회 2010 한국소성가공학회 학술대회 논문집 Vol.2010 No.10
To apply boron steel to chassis parts in automobiles, weldability with dissimilar materials is required, as well as formability during hot stamping. Accordingly, this study investigated the effect of the welding heat input on the mechanical properties and the fatigue life of a quenched boron steel and ferrite-bainite (FB) steel lap joint. It was found that, the higher the welding heat input at the weld metal and boron steel HAZ, the lower the hardness. However, at the FB steel HAZ, the hardness was not significantly changed by the welding heat input. Plus, the high hardness of the weld metal and boron steel HAZ prevented the initiation of cracks in the stress concentration area around the bead. While the fatigue life was affected by the residual stress, the variation of the welding heat input used in this study had hardly any affect on the residual stress. Nonetheless, the fatigue life was affected by the bead geometry that changed according to the welding heat input. Thus, for the lap joint, the bead geometry was a significant parameter affecting the fatigue life, which increased when increasing the bead width.
김연수(Y . S . Kim),이중건(J . G . Lee),정윤철(Y . C . Jung),이진학(J . H . Lee),최영진(Y . J . Choi),안규리(C . Ahn),한진석(J . S . Han),김성권(S . Kim),김병국(B . K . Kim),이정상(J . S . Lee),이현순(H . S . Lee) 대한내과학회 1994 대한내과학회지 Vol.46 No.2
Castlemam's disease is an asymptomatic and benign lymph node hyperplasia which is frequently manifested as mediastinal mass in over 70% of cases. Amyloidosis is rarely associated with Castleman's disease. Recently we experienced a patient with nephrotic syndrome due to renal amyloidosis who had been previously diagnosed as Castleman's disease of retroperitoneal lymph node enlargement. A 47-year old woman was admitted because of generalized edema and chest tightness. Five months ago she diagnosed as Castlman's disease-plasma cell type, of retroperitoneal lymph node enlargement. The patient was followed up through outpatient department without any specific medication. Physical examination showed pale conjunctivae, palpable mass on epigastric area and pretibial pitting edema. The hemoglobin, leukocyte count and erythrocyte sedimentation rate were 96 g/L, 5.9×109/L and 127 mm/hour, respectively. The blood urea nitogen was 3.6 mmol/L and creatinine was 88 umol/L. The urinalysis showed 3 positive for albumin. Twentyfour hour urine contained 16.6 grams of protein. A computerized tomographic (CT) scan of the abdomen disclosed multiple lymph node enlargement at mesentery. Percutaneous needle biopsy of kidney showed massive infiltration of pale pinkish amorphous material in the glomerular tuft forming large nodules. Ultrastructural examination exhibited heavy deposition of amyloid fibrils in the mesangium and perpendicular to glomerular basement membrane. Polarizing microscopy with Congo-red stain revealed prominent yellow green birefringence in glomeruli, tubules and interstitium.