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강남규,홍훈표,김명천,고영관 대한응급의학회 2004 大韓應急醫學會誌 Vol.15 No.3
Spontaneous spinal epidural hematoma (SSEH) is a rare entity that has been reported to occur in different age groups, from pediatric to elderly patients. The etiology and the pathogenesis remain unclear. By definition, SSEH excludes that due to obvious trauma, anticoagulant therapy, coagulopathy, vascular malformation, and tumors. The presenting symptoms vary, but the usual earliest presentation is a sudden stabbing pain associated with a nerve-root type of irradiation. A variable degree of sensorimotor deficit then rapidly develops. An urgent computed tomography (CT) myelography and magnetic resonance imaging (MRI) can be performed to diagnose the hematoma. For patients with incomplete sensorimotor deficit, favorable outcomes are thought to correlate highly with surgery (decompressive laminectomy) within 48 hours. This critical time is sharply reduced to 12 hours for patients with complete sensorimotor deficit.
입자분포가 Mn-Zn Ferrite의 전자기적 물성에 미치는 경향
강남규,서정주,신명승,한명호 한국세라믹학회 1998 한국세라믹학회지 Vol.35 No.10
고주파 저손실 재질로 사용되는 Mn-Zn ferrites의 제조공정 중 입도분포제어가 전자기적 물성에 미치는 효과에 관하여 연구하였다. 입도분포는 분쇄시간을 변화시켜 제어하였으며 철의 유입을 막기위하여 지르코니아볼을 사용하였다. 분쇄시간이 증가함에 따라 입자크기는 2.1 $\mu\textrm{m}$에서 1.0$\mu\textrm{m}$로 감소하였으며, 비표면적은 0.55에서 3.21m2/g으로 증가하였다. 비표면적 값이 증가할수록 소결체의 밀도는 증가하였으며, 높은 비표면적을 가진 분말의 경우 1300$^{\circ}C$ 이 상의 고온에서 소결할 때 불균일한 미세구조와 과대입성장이 발생하였으며, 전자기적 물성감소가 나타났다. The effects of particle size distribution have been investigated on the high frequency low loss Mn-Zn fer-rites. The particle size distribution was controlled by milling time. Zirconia ball and engineering plastic jar were employed to avoid iron contamination from the milling media. As increasing the milling time BET value was increased from 0.55 to 3.21m2/g and mean particle size was decreased from 2.1 $\mu\textrm{m}$ to 1.0$\mu\textrm{m}$ The large specific surface area of initial powder resulted in the high density of sintered core. However starting powders with high BET lead to inhomogeneous grain growth as well as poor electromagnetic pro-perties at sintering temperature above 1300$^{\circ}C$.