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成台慶,李永根,宋鎭彦 中央醫學社 1974 中央醫學 Vol.27 No.6
Supratentorial hemangioblastomas are extremely rare since almost all of the hemangioblastomas of the central nervous system were occurred in the cerebellum. We have experienced a case of the right parieto-occipital hemangioblastoma which was removed successfully and confirmed histologically. A 64-year-old woman was admitted to St. Mary's Hospital, Catholic Medical College in October, 1973, because of headache, vomiting, left hemiparesis and mental confusion. She had had severe headache since 6 months prior to admission and associated with frequent nausea and vomiting. Mental confusion and progressive left hemiparesis were detected by family since 2 months prior to admission. On admission, neurological examination revealed drowsiness and disorientation. Ophthalmological examination disclosed visual impairment, papilledema and left inferior quadrantanopsia. There was left face supranuclear type weakness and left hemiparesis with positive pathological reflex. Right carotid angiogram showed a well demarcated homogenous round tumor stain at paramedian area of the right parieto-occipital Iobe. Brain scan with 99'Tc pertechnetate showed a round uptake at the right parieto-occipital region. Through the right temporo-parieto-occipital craniotomy we found a brownish red solid mass which was embedded into medial aspect of the occipital lobe adjacent to falx. The tumor was not attached to the meninges or falx. The tumor was successfully removed en bloc, and it was measured 5. 5cm X4. 5cm X2. 5cm in size. Postoperative course was uneventful and follow-up observation noted improvement of previous symptoms and signs except visual defect. Histological features of the tumor showed numerous delicate vascular channels primarily of capillary type with blood in the lumina of the large vessels. Histological diagnosis was hemangioblatoma.
무선 ATM망에서의 매체접근제어 프로토콜 및 자원할당기법에 대한 연구
성태경,김동일 한국정보통신학회 1998 한국정보통신학회논문지 Vol.2 No.3
본 논문에서는 BSA(Basic Service Area)에 독립적으로 분산되어 있는 이동단말기들을 대상으로 기존 STM(Synchronous Transfer Mode)에서의 유휴채널을 이용하여 다른 트래픽을 지원하므로 서 이용률을 극대화시킬 수 있는 통계적 다중화 기능을 무선매체를 통해 확장하는 기능을 수행하는 무선 ATM 망에서의 매체접근제어 프로토콜과 멀티미디어 서비스특성에 따른 기존 유선망 기반에서의 고정할당방식(연결 지향적) 및 랜덤할당방식(비연결지향적)을 개선하기 위한 동적 예약 기반의 매체접근제어 프로토콜에 대해 제시한다. In this paper, conventional STM(Synchronous Transfer Mode) supports another traffics by using idle channels. Proposed mobile terminals are distributed independently at the BSA(Basic Service Area). So, MAC(Medium Access Control) specified on the wireless ATM networks, which is managing statistics multiplewing functions, idle channel's ultilization is maximized and multimedia service characteristic for conventional wired networks based fixed assignment scheme(connection-oriented) and random assignment scheme(connection-oriented) improving on dynamic reservation based MAC protocol.
성태경,이홍용,김치경,Sung, Tae-Kyung,Lee, Heung-Yong,Kim, Chi-Kyung 한국현미경학회 1992 Applied microscopy Vol.22 No.1
Antibacterial effects of the water-soluble extract of Ulmus pumila L. on Staphylococcus aureus and Escherichia coli were studied by cylinder plate dilution method. The cells of S. aureus and E. coli treated with the extract were comparatively examined by scanning and transmission electron microscopies for their morphological features. The normal cells of S. aureus and E. coli showed thypical coccus and rod shapes, respectively, but the cells of S. aureus treated with the extract showed rough surface structures with many granular protrusions and were destroyed to form ghost cells by liberating their cytoplasmic components. E. coli cells treated with the extract were destoryed without enlarging in size and producing granules on their surfaces.