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A Rupture Distal Anterior Cerebral Artery Aneurysm Invaded by Anaplastic Oligodendroglioma
전태형,황정현,함인석 대한신경외과학회 2004 Journal of Korean neurosurgical society Vol.35 No.5
The authors report a very unusual case of ruptured aneurysm by direct vessel invasion of anaplastic oligodendroglioma (WHO grade III) confirmed by histopathological examinations. As local invasion is the hallmark of malignant gliomas, malignant glial tumors invade neighboring structure and often cause microscopic endothelial proliferation, telangiectasias in small arteriols, but direct arterial invasion by glioma is very rare. Possible mechanisms of intracranial aneurysm development by glioma are thought to be related to the close proximity to the tumor, perivascular basement membrane breakage due to high tumor pressure and increased regional blood flow through the feeding artery of tumor. The aneurysm and tumor were treated in a single operation simultaneously.
전태형,박기수,박성현,황정현,황성규 대한신경손상학회 2017 Korean Journal of Neurotrauma Vol.13 No.2
Objective: Aquaporin (AQP) is a recently discovered protein that regulates water homeostasis. The present study examines changes in AQP 1 and 4 in kaolin induced experimental hydrocephalic rats to elucidate the pathophysiology of waterhomeostasis in the disease. Methods: Hydrocephalus was induced by percutaneous intracisternal injection of kaolin. The brain parenchyma and choroid plexus were obtained at 3, 7, 14 and 30 days after injection. Protein expressions of AQP 1 and 4 were measured bywestern blot, immunohistochemistry (IHC) and immunofluorescence (IF) stains. Results: In the choroid plexus of the kaolin-induced hydrocephalus group, AQP 1 expression identifed by western blotexhibited sharp decrease in the early stage (55% by the 3rd day and 22% by the 7th day), but indicated a 2.2-fold increasein the later stage (30th day) in comparison with control groups. In the parenchyma, a quantitative measurement of AQP 4expression revealed variable results on the 3rd and 7th days, but indicated expression 2.1 times higher than the control inthe later stage (30th day). In addition, the IHC and IF fndings supported the patterns of expression of AQP 1 in the choroidplexus and AQP 4 in the parenchyma. Conclusion: Expression of AQP 1 decreased sharply in the choroid plexus of acute hydrocephalus rats and increased atlater stages. Expression of AQP 4 in the brain parenchyma was variable in the early stage in the hydrocephalus group, butwas higher than in the control in the later stage. These fndings suggest a compensating role of AQPs in water physiologyin hydrocephalus.
전태형,박기수,박성현,황정현,황성규 대한신경손상학회 2017 Korean Journal of Neurotrauma Vol.14 No.2
Objective: Aquaporin (AQP) is a recently discovered protein that regulates water homeostasis. The present study examines changes in AQP 1 and 4 in kaolin induced experimental hydrocephalic rats to elucidate the pathophysiology of waterhomeostasis in the disease. Methods: Hydrocephalus was induced by percutaneous intracisternal injection of kaolin. The brain parenchyma and choroid plexus were obtained at 3, 7, 14 and 30 days after injection. Protein expressions of AQP 1 and 4 were measured bywestern blot, immunohistochemistry (IHC) and immunofluorescence (IF) stains. Results: In the choroid plexus of the kaolin-induced hydrocephalus group, AQP 1 expression identifed by western blotexhibited sharp decrease in the early stage (55% by the 3rd day and 22% by the 7th day), but indicated a 2.2-fold increasein the later stage (30th day) in comparison with control groups. In the parenchyma, a quantitative measurement of AQP 4expression revealed variable results on the 3rd and 7th days, but indicated expression 2.1 times higher than the control inthe later stage (30th day). In addition, the IHC and IF fndings supported the patterns of expression of AQP 1 in the choroidplexus and AQP 4 in the parenchyma. Conclusion: Expression of AQP 1 decreased sharply in the choroid plexus of acute hydrocephalus rats and increased atlater stages. Expression of AQP 4 in the brain parenchyma was variable in the early stage in the hydrocephalus group, butwas higher than in the control in the later stage. These fndings suggest a compensating role of AQPs in water physiologyin hydrocephalus.
롤피치 제한 조건에 강인한 가중 최소자승법 기반 마그네토미터 캘리브레이션 기법
전태형,이정근,Jeon, Tae-Hyeong,Lee, Jung-Keun 한국센서학회 2017 센서학회지 Vol.26 No.4
Magnetometer calibration must be performed before the use of three-axis magnetometers to ensure the accuracy of orientation estimation. Recently, one of the most popular calibration approaches is the ellipsoid fitting technique due to its high performance in calibration. To date, in fact, performances of the existing ellipsoid fitting methods have been evaluated with full range rotation data. However, in case of the calibration of magnetometers attached to vehicles, ships, and planes, it is very difficult to collect the full range rotation data since their allowable ranges in terms of roll and pitch are limited to small. This constraint may result in serious performance degradation of some ellipsoid fitting algorithms. Therefore, to be practical, this paper proposes a weighted least square-based magnetometer calibration method that is robust in roll-pitch limited conditions. Furthermore, the proposed method is a linear approach and thus is free from the well-known initial value issue in nonlinear approaches. Experimental results show the superiority of the proposed method to other ellipsoid-fitting calibration methods.