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Endovascular Treatment of the Distal Internal Carotid Artery Large Aneurysm
배홍주,유도성,허필우,이태규,조경석,이상복 대한뇌혈관외과학회 2014 Journal of Cerebrovascular and Endovascular Neuros Vol.16 No.3
Objective : According to the development of endovascular technique anddevices, larger aneurysms on the distal internal carotid artery (ICA) canbe treated using a less invasive method. The authors report on clinicaland angiographic outcomes of these aneurysms treated using an endovasculartechnique. Materials and Methods : Data on 21 patients with large aneurysms atdistal ICA treated by endovascular method between January 2005 andDecember 2012 were included in this retrospective analysis. Results : Clinical outcome of patients showed strong correlation with theinitial neurologic status (p < 0.05). Aneurysm morphology showed saccular,fusiform, and wide-neck in 12, six and three patients. Six patients underwentstent assisted coiling and the other 15 patients underwent simplecoiling. Aneurysm occlusion was performed immediately after embolizationwith near-complete (Raymond class 1-2) in 20 patients (95.2%) andincomplete (Raymond class 3) in one patient (4.8%). Delayed thromboticocclusion occurred in two patients and their clinical result was fatal. Anotherfive patients died in the hospital, from massive brain edema and/or increasedintracranial pressure due to initial subarachnoid hemorrhage. Overallmortality was 30% (seven out of 21). Fatal complication related to theendovascular procedure occurred in two patients with thrombosis at middlecerebral artery (one with stent, the other without it). Conclusion : Recent developed endovascular device and technique is safeenough and a less invasive method for distal large or giant aneurysms. Based on our analysis of the study, we suspect that coil embolization oflarge distal ICA aneurysms (with or without stenting) is effective and safe.
1차 데드비트 토크 관측기를 이용한 IPMSM에 연결된 베어링 고장 진단 방법에 대한 연구
윤인식,배홍주,김승택,오귀운,고종선 대한전기학회 2023 전기학회논문지 Vol.72 No.10
Ball bearings are used in many mechanical devices with dynamic characteristics. When a failure occurs in a motor or pump, there are many failures due to the ball bearing. So, research on the diagnosis of ball bearing failures is being actively conducted. When a ball bearing fails, vibration occurs due to the natural frequency component of each part, which increases the friction between the ball bearing and the rotating shaft. This increases the load torque applied to the rotating machine performing rotational motion. In this paper, the torque was observed through the first order deadbeat torque observer for fault diagnosis of ball bearings connected to the IPMSM, and then it is filtered with BPF. The filtered value is used to detect the magnitude in the failure frequency band, and it is applied to the failure diagnosis algorithm to determine whether there was a failure. The proposed fault diagnosis algorithm was verified through simulation using MATLAB/Simulink. In addition, the fault diagnosis algorithm was verified by attaching a bearing housing to the M-G set consisting of 4 IPMSM and 5.5 IM.