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블리스터 시험법을 이용한 열증착 금박막의 기계적 성질 측정
문호정,함순식,엄윤용,조영호,Moon, Ho-Jeong,Ham, Soon-Sik,Earmme, Yun-Young,Cho, Young-Ho 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.3
Mechanical properties, including Young's modulus, residual stress and rupture strength, of a thermally evaporated gold film have been measured form a blister test. In a theoretical study, the priniple of minimum potential energy and that of virtual work have been applied to the pressurized circular membrane problem, and load-deflection relations have been derived for typical membrane deflection mode of spheroidal shape. In an experimental study, circular gold membranes of 4800 A-thickness and 3.5mm diameter were fabricated by the silicon electropolishing technique. Mecahnical properties of the thin gold films were deduced from the load-deflection curves obtained by the blister test, Young's moduli, obtianed from blister test, have been in the range of 45-70 GPa, while those of bulk gold have been in the range of 78-80 GPa. Residual stresses in the evaporated gold films have been measured as 28-110MPa in tension, The rupture strength of the gold film has turned out to be almost equal to that of dental gold alloy (310-380MPa). It has been demonstrated that the present specimen fabrication method and blister test apparatus have been effective for simultaneous measurement of Young's modulus, residual stress and repture strength of thin solid films. Especially, the electropolishing technique employed here has provided a simple and practical way to fabricate thin membranes in a circular or an arbitrary shape, which could not be obtained by the conventional anisotropic silicon mecromachining technique.
범혈구 감소증과 경한 간기능 이상이 동반된 신생아 홍반성 낭창
이승민 ( Seung Min Lee ),함순식 ( Soon Shik Ham ),전인상 ( In Sang Jeon ),손동우 ( Dong Woo Son ) 대한주산의학회 2005 Perinatology Vol.16 No.4
Neonatal lupus erythematosus (NLE) is an uncommon passive autoimmune disease in which there is a transplacental passage of anti-Ro or anti-La maternal autoantibodies. The cutaneous lupus lesions are commonly observed and usually resolve spontaneously. The cardiac involvement which sometimes needs the permanent pacemaker, however, is the most clinically significant manifestation of NLE. In addition, the hepatic and hematologic abnormalities are observed in approximately 10% of infants with NLE. Therefore, in the way of the evaluation of hematologic disorders in neonate, NLE should be included. We present a case of NLE in an infant born to a mother with anti-Ro, and he had skin rash, pancytopenia and mildly abnormal liver functions without cardiac manifestation.