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안성환 朝鮮大學校 附設 醫學硏究所 2009 The Medical Journal of Chosun University Vol.33 No.S
Stroke is a leading cause of death in Korea. Although the most cost-effective treatment is primary prevention, appropriate managements are influenced on mortality or disability during acute period after onset. Stroke is a vascular event secondary to real disease of blood vessels of the brain. Also, stroke is not one illness but rather it includes several diseases that lead to occlusion of a vessel and progression of neurologic symptoms. Neurologist or physicians must decide treatment options according to medical problems of individual patient. In this review, the process of diagnosis and the principles of evidence based management of patients with acute stroke were described.
當歸의 種類에 따른 四物湯이 白鼠의 胸部大動脈 血管弛緩에 미치는 影響
김형환,이주호,이제현,안덕균,박성규 대한본초학회 2001 大韓本草學會誌 Vol.16 No.2
We have examined the relaxational reponse to the water extract of Angelica gigas Nakai (AG), A. sinensis(Oliv.) Diels (AS), A. acutiloba Kitagawa (AA), and Four-Substance Decoctions (AG-FSD, AS-FSD, AA-FSD) in isolated thoracic aorta from sprague dawley(SD) rat in the presence and absence of endothelium. Rat thoracic aorta was investigated in vessel segments suspended for isometric tension recording by polygraph. Responses to AG, AS, AA and AG-FSD, AS-FSD, AA-FSD were investigated in vessels precontracted with 5-hydroxytryptamine(5-HT) were compared in vasodilation effect. We found that the thoracic aorta segments responded to AG, AS, AA and AG-FSD, AS-FSD, AA-FSD with a dose-dependent vasodilation. The 5-hydroxytryptamine induced contraction at 10-4M were inhibited by 26.3%, 2.7%, 2.1% and 24.6%, 1.1%, 3.2% after addition of the 0.1 g/㎖ water extract of AG, AS, AA and AG-FSD, AS-FSD, AA-FSD. The 5-hydroxytrptamine induced contraction at 10^-4M with and without endothelium were inhibited by 24.6% and 6.9% after addition of the 0.1 g/㎖ water extract of AG-FSD. In conclusion, AG, AS, AA and AG-FSD, AS-FSD, AA-FSD-induced relaxation in the isolated rat thoracic aorta were composed of dose-dependent relaxation. AG-FSD has very potent vasodilation.
정상인에서 전기 및 자기 자극을 이용한 설 근육의 전기생리학적 평가
조은미,류종현,안성환,조경원,임건한,김진호,김후원 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.1
Background: Abnormality of lingual muscles is clinically common. But its exact clinical assessment is quite difficult. Evaluation of motor power of the lingual muscles and their neural pathway is limited because of anatomical inaccessibility and individual variation of subjective symptoms. Transcranial magnetic stimulation (TMS) of the human motor cortex is a non-invasive tool to assess the functional integrity of the fast conducting central motor pathways and electrical stimulation of lingual nerve is a conventional method of peripheral nerve conduction. Therefore both study will be helpful to understanding of pathophysiology of lingual abnormality. Until now there is no such report in Korea. This study was conducted to acquire the easier method and normal control values of Korean subjects. Method: We recorded the motor responses from the lingual muscles of 32 healthy subjects (22 men, 10 women) by focal cortical TMS with a circular coil. Motor potentials were recorded by means of surface electrodes applied on the both side of the tongue, following TMS several centimeters lateral from the vertex and parietooccipital cortex and peripheral electrical stimulation of the 12th cranial nerve at the lateral 1/3 point of the line between the midline and angle of mandible. Results: During moderate motor activation, majority of maximal motor response were obtained 4-6cm lateral to the vertex with similar latencies. And the responses from magnetic stimulation of the intracranial segment of hypoglossal nerve were discarded because of difficulty to obtain and unsatisfactory reproducibility. The latency of motor evoked potentials in right cortical stimulation was 10.08 ± 1.17 msec and in left stimulation 10.04 ± 1.32 msec. The amplitudes in right 2.15 ± 1.02, left 2.09 ± 1.11 mV. The latencies electric hypoglossal nerve stimulation were 2.42 ± 0.34 in right, 2.49 ± 0.35 msec in left side. The amplitudes were 2.90 ± 2.37 in right, 2.43 ± 1.86 mV in left side. Central conduction times as calculated by subtracting the response latencies obtained by magnetic and electric stimulation are right 7.65 ± 1.19, left 7.55 ± 1.35 msec. There was no significant difference between man and woman, Conclusion: The method may be efficient, noninvasive, painless, and easy reproduced. With more extensive application to various neurological disorders, it comes close to being an ideal clinical conduction study technique for this cranial nerve.
이희백,천성문,안병환 대진대학교 교육대학원 교육연구소 1999 교육연구 Vol.1 No.1
The development of the efficient learning habit improves the learning ability and helps the adjustment of school life and self-development. Therefore this study is to develop the various training programs for learning habit improvement of college students and apply them to school.
정상섭,박상근,오성훈,김선호,윤도흠,박정수,양우익,최인준,안영수,김경환,박창일,김진수,이현철 대한신경외과학회 1988 Journal of Korean neurosurgical society Vol.17 No.6
Recent experimental studies and clinical cases have suggested that grafting tissue from the adrenal medulla into the brain may alleviate the symptoms of Parkinson's disease. Autologous adrenal medullary grafts into the striatum was performed stereotactically in two patients with Parkinson's disease. Both patients were bedridden preoperatively, but 4 months after the surgery both became ambulatory and one was even capable of returning to his job. Even though the number of cases was small⑵ and the follow-up period was short, this study shows that adrenal medullary transplantation into the striatum may have some beneficial effects in patient with Parkinson's disease. Further experimental and clinical trials are necessary to see whether this procedure will be a recommendable surgical treatment for patients suffering from Parkinson's disease.
직접 메탄올 연료전지내의 유체 유동특성 및 전기화학적 해석을 위한 시뮬레이션
김영진,오인환,홍성안,이태희,김혁년,하흥용 한밭대학교 에너지청정기술연구소 2003 에너지청정기술논문집 Vol.3 No.1
상용 유체 전산모사 코드인 FLUENT ver.6.0을 이용하여 직접 메탄올 연료전지의 전기 화학적 해석 및 채널 내에서의 유체의 유동 분석을 하였다. 본 전산모사를 통해 채널내의 유속, 압력, 온도, 농도 및 전류밀도 분포에 대한 다양한 정보를 얻을 수 있었으며, 채널디자인에 따른 반응물 및 생성물의 유동에 대한 정보를 통해 최적의 채널 형태를 결정할 수 있었다. 이와 같은 전산모사 방법을 사용하면 직접 메탄올 연료전지의 전극과 분리판채널의 구조를 최적화하는데 매우 유리하다. An numerical analysis of electrochemical reaction and dynamics of the fluid flow in the channels of DMFC separator was carried out by using a commercial computational fluid dynamics(CFD) code Fluent(ver.6.0). From the simulation work, much valuable information was obtained in terms of distributions of velocity, pressure, temperature, concentration and current density over the flow field. And it was possible to optimize the flow field structure by using the simulation results. The simulation work using the CFD code was found very helpful in analysing the phenomena occurring in the fuel cell and optimizing the structures of electrodes and flow field.