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류성근,이세진 대한신경과학회 2014 대한신경과학회지 Vol.32 No.4
A 31-year-old female with paroxysmal nocturnal hemoglobinuria (PNH) presented with left hemiparesis. One year priorto this presentation she had been diagnosed with bihemispheric cerebral infarctions associated with moyamoyasyndrome. During her current presentation, MRI revealed acute infarction of the right hemisphere and MRA revealedocclusion of the right internal carotid artery (ICA), and aggravation of the preexisting stenosis of the contralateral ICAand ipsilateral posterior cerebral artery compared to the previous MRA. We report herein a case of progressivemoyamoya syndrome associated with PNH.
류성근,최지웅,박경준 한국통신학회 2013 Journal of communications and networks Vol.15 No.2
The networkmobility basic support (NEMO BS) protocol has been investigated to provide Internet connectivity for a group of nodes, which is suitable for intelligent transportation systems (ITS)applications. NEMO BS often increases the traffic load and handover latency because it is designed on the basis of mobile Internet protocol version 6 (MIPv6). Therefore, schemes combining proxy MIPv6 with NEMO (P-NEMO) have emerged to solve these problems. However, these schemes still suffer from packet loss and long handover latency during handover. Fast P-NEMO (FP-NEMO) has emerged to prevent these problems. Although the FP-NEMO accelerates handover, it can cause a serious tunneling burden between the mobile access gateways (MAGs) during handover. This problem becomes more critical as the traffic between the MAGs increases. Therefore, we propose a scheme for designing an improved FP-NEMO (IFP-NEMO) to eliminate the tunneling burden by registering a new address in advance. When the registration is completed before the layer 2 handover, the packets are forwarded to the new MAG directly and thereby the IFP-NEMO avoids the use of the tunnel between the MAGs during handover. For the evaluation of the performance of the IFP-NEMO compared with the FPNEMO,we develop an analytical framework for fast handovers on the basis of P-NEMO. Finally, we demonstrate that the IFP-NEMO outperforms the FP-NEMO through numerical results.
류성근,이제혁,정신,박종근,김재휴,김수한,강삼석 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.6
In this retrospective clinical analysis for 143 patients who underwent operation due to multiple intracrarial aneurysms during the last 12 years(1983-1994), we intended to find out the clinical characteristics, the significant signs for the differentiation between ruptured and unruptured aneurysm, and to compare the results of one-stage operations with those of two-stage operations. The results were as follows : Of 864 patients operated on due to intracranial aneurysms. 143 patients(16.6%) had two or more intracranial aneurysms. Multiple aneurysms were more common in females, with a female to male ratio of 2.4:1 as compared with 1.3 to 1 for patients with single aneurysm. Common locations of the aneurysms were the middle cerebral artery, and posterior communicating artery, anterior communicating artery, and the anterior choroidal artery, in that order, in identifying the site of rupture, the focal hematoma in brain CT scan, segmental vasospasm, irregularity and sizes of aneurysmal sacs on angiograms were helpful. Aneurysms 3mm or less were less prone to rupture. However, for those with a diameter of more than 4mm, the frequency of rupture increased with the size of aneurysm. Eighty eight percent of patients who underwent operations had a favorable outcome and the operation mortality rate was 7.7%. In patients of Grade Ⅰ and Ⅱ, surgical results of the one-stage operation group and two-stage operation group did not differ. In Grade Ⅲ patients, the results were better for the two-stage operation group, without statistical significance. From our studies we have come to the conclusion that incidental aneurysms found in patients with low risk should be treated at the same time when ruptured aneurysms are clipped.
외상성 두개강내 동맥류 : 6례보고 Report of Six Cases
류성근,김태선,김재휴,정신,이제혁 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.8
Six cases of traumatic intracranial aneurysms are presented. two located on the internal artery. two on the anterior cerebral artery, one on the middle cerebral artery. and one on the middle meningeal artery. Three of the 6 cases were associated with skull fracture. Five cases were treated : two by clipping. two by trapping and one by excision & coagulation of the lesion. Due to increasing use of brain CT to substitute angiogram during the initial surveys of head injury patients. traumatic aneurysms are often overlooked and the diagnosis delayed. Since the clinical course of traumatic aneurysm is variable and its high mortality rate. immediate cerebral angiography & early proper treatment are recommended whenever clinical suspicion of traumatic aneurysm is aroused or/and delayed neurological deterioration is detected after head injury. In this study. the authors tried to find out the clues for early diagnosis of traumatic intracranial aneurysms.
류성근,주민경,노현두,권정임,이준 대한신경과학회 2014 대한신경과학회지 Vol.32 No.3
It is believed that migrainous aura is correlated with cortical spreading depression and spreading benign oligemia. A54-year-old female with migraine with aura presented with left hemianopia preceding pulsating headache. Perfusion-weighted images revealed delayed contrast arrival to the right occipital lobe and nearly normal relativecerebral blood volume images, indicating benign oligemia. Follow-up perfusion-weighted images revealed resolution ofthe perfusion abnormalities. We report herein a case of migraine with aura presenting with reversible delayed perfusionin the right occipital lobe on perfusion-weighted images.
홈에이전트로의 빠른 바인딩 갱신 방법을 통한 FMIPv6 핸드오버 개선 방안
류성근,문영성,Ryu Seong-Geun,Mun Young-Song 한국정보처리학회 2006 정보처리학회논문지 C : 정보통신,정보보안 Vol.13 No.1
Mobile IPv6에서 이동노드가 서브넷 사이를 이동할 때 핸드오버 처리가 필요하며 그로인한 지연시간이 문제가 되고 있다. 이러한 핸드오버 지연시간을 줄이기 위해서, IETF의 Mipshop 워킹그룹에서, 이동할 서브넷에 사용될 이동노드의 새로운 주소의 생성과 검증을 2계층 핸드오버 이전에 수행하는 Fast Handover(FMIPv6)을 연구하여 핸드오버 지연시간을 줄였다. 그러나 FMIPv6 또한 이동한 후에 홈에이전트와 상대노드에게 이동을 알려야 하기 때문에, 등록 지연시간은 여전히 존재하게 된다. 본 논문은 FMIPv6을 기반으로 하여 홈에이전트에게 새로운 주소에 대한 바인딩 갱신을 수행할 때까지의 지연시간을 단축시키는 방법을 제안한다. FMIPv6 과정에서 사용되는 Fast Binding Upate(FBU) 메시지에 홈에이전트로의 임시 바인딩 갱신 메시지를 인캡슐하여 전송함으로써 2계층 핸드오버 수행과정 동안에 미리 홈에이전트에게 바인딩 갱신을 하는 방법이다. 본 논문은 성능평가를 위하여 핸드오버시의 시그널링 비용과 전송비용을 비교 분석하였으며, 성능평가를 통하여 제안하는 방법이 FMIPv6보다 핸드오버 지연시간을 단축시켜 핸드오버 성능을 약 21% 향상시킬 수 있음을 보여준다. In Mobile IPv6, a handover latency is an important issue. To reduce the handover latency, mipshop working group in IETF has studied the fast handover(FMIPv6) which creates and verifies a new care-of address(NCoA) in advance before a layer 2 handover resulting in reduced handover latency. Even in FMIPv6, the NCoA must be registered in a home agent(HA). This registration still creates a significant amount of delay. To reduce registration latency, we propose a tentative and early binding update(TEBU) scheme that the NCoA is registered in the HA in advance during the layer 2 handover based on FMIPv6. We use cost analysis for the performance evaluation. As a result, we found that the TEBU scheme guarantees lower handover latency than FMIPv6 as much as approximately 21%.