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실험적 뇌경색에서 Xanthine Oxidase 활성도 변화에 관한 연구
민병국,박관,김영백,황성남,석종식,최덕영,박용석,이영배 대한신경외과학회 1992 Journal of Korean neurosurgical society Vol.21 No.7
To observe the activity of the xanthine oxidase in cerebral ischemia, an ischemic model was made using a transorbital occlusion of the middle cerebral artery(MCA) in cats. Xanthine oxidase activity was measured by means of high performance liquid chromatography with electrochemical detection of uric acid. The results were as follows : 1) The infarction in the territory of the left middle cerebral artery(MCA) was identified with intracardiac perfusion of a 2% triphenyltetrazolium chloride(TTC) solution after transorbital occusion. 2) There was no significant difference between the control and ischemia groups in the total xanthine oxidase activity. 3) In the control group, 38.2% of the total xanthine oxidase was in the oxygen-dependent superoxide-producing oxidase group (Type 0). It had been increased with time in ischemia, despite the total xanthine oxidase activity remaining the same ; particularly at 12 hours (p<0.05) and 24 hours (p<0.01) after occlusion of the left MCA. 4) In the healthy side, the activity of type 0 and its ratio to the total xanthine oxidase activity has not been increased. 5) IN the ischemic side, the conversion of type D xanthine oxidase to the type 0 xanthine oxidase was demonstrated and its rate had been increased with the passage of time.
OLAP 상에서 데이터 접근 제어 메커니즘 설계 및 구현
민병국,최옥경,김강석,홍만표,예홍진,Min, Byoung-Kuk,Choi, Ok-Kyung,Kim, Kang-Seok,Hong, Man-Pyo,Yeh, Hong-Jin 한국정보처리학회 2012 정보처리학회논문지 C : 정보통신,정보보안 Vol.19 No.2
OLAP(On-Line Analytical Processing) 툴은 조직 운영에서 발생하는 데이터의 양이 많아짐에 따라 분석 수요도 함께 급증하며 전문 분석가의 역량만으로는 처리할 수 없는 분석 요구 사항을 충족시키기 위한 툴이다. OLAP에서는 다양한 사용자가 직접 데이터베이스에 접근하여 대화식으로 질의를 던지고 응답을 받아 분석 업무를 진행할 수 있다. 이렇게 많은 사용자들이 데이터베이스에 직접 접근을 하게 됨에 따라 조직의 민감한 데이터를 지키기 위한 보안 정책이 필수가 되었다. 하지만 기존 연구에서는 OLAP의 기능적인 분석에 치중하여 MDX(Multidimensional Expressions)와 XMLA(XML for Analysis) 등의 기법으로 기능을 구현하는 것에 그치고 있다. 이에 본 연구에서는 기존 연구의 문제점을 보완하기 위한 방법으로 효율적인 정보 보호를 위한 데이터 접근 제어 메커니즘을 제안하고 이를 설계 및 구현하였다. 제안한 데이터 접근 방법이 실제 OLAP 환경에서 효율성 있게 동작함을 확인하기 위해 실험평가를 수행하여 본 연구의 우수성을 입증하였다. OLAP(On-Line Analytical Processing) is a tool to satisfy the requirements of managing overflowing data analysis. OLAP can provide an interactive analytical processing environment to every end-user. Security policy is necessary to secure sensitive data of organization according to users direct access database. But earlier studies only handled the subject in its functional aspects such as MDX(Multidimensional Expressions) and XMLA(XML for Analysis). This research work is purported for solving such problems by designing and implementing an efficient data access control mechanism for the information security on OLAP. Experimental evaluation result is proposed and its efficiency and accuracy are verified through it.
뇌파 등전위 분포도법의 임상적 응용 : Computed Mapping of EEG
민병국,황성남,석종식,최덕영,임광세 대한신경외과학회 1987 Journal of Korean neurosurgical society Vol.16 No.1
Topographic electroencephalographic study (CME) is a newly developed method using a microcomputer system that displays the scalp topograph as the square roots of the average power spectra over each EEG frequency band on a color television screen. CME were applied to thirty patients. Fifteen patients out of them with focal neurologic deficit were analysed about CT scan and conventional EEG. The results of the study were as follows: 1) Comparing the results of CME and conventional EEG reading, CME revealed to be slightly more sensitive in detecting asymmetrical depression of background activity than the conventional reading of the EEG. 2) Topograph EEG study was more accurate than conventional EEG in lateralization of the lesion. 3) CME is very useful in topographic and objective diagnosis of functional lesion, although the source of the data is the same as that from the conventional EEG.
소아에서 시상하부에 발생한 모양세포성 신경교종 : 증례 보고 Case Report
민병국,구영두,석종식,최덕영 대한신경외과학회 1980 Journal of Korean neurosurgical society Vol.9 No.2
The Juvenile pilocytic astrocytoma has histologically the same features as the adult type one. Contrary to the adult type, the parallel arrangement of fibrils in long thin tapering cells of the tumor is peculiarly independent of the environment in which the tumor is growing and it gives rise to the main tumor mass that is usually well circumscribed. The overall incidence is relatively rare of all the brain tumor, it occurs in children mainly from three to five of age. Its predilection sites are the hypothalamus and the optic chiasm. We are reporting an experiance of a juvenile pilocytic astrocytoma in a three years old female patient, involving the hypothalamus, basal ganglia and deep white matter of the temporoparietal lobe of the left side.