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심형태,범민선,김성룡,류상완 대한흉부외과학회 2014 Journal of Chest Surgery (J Chest Surg) Vol.47 No.6
Thoracic endovascular aortic repair has become a widespread alternative treatment option for thoracic aortic aneurysm. The debranching of arch vessels may be required to provide an acceptable landing zone for an endovascular stent graft. We report a case where the bypass graft used in the thoracic endovascular aortic repair procedure compressed the left internal jugular vein, causing acute thrombotic occlusion.
심형태,김성룡,범민선,장지욱,김나래,장미희,류상완 대한흉부외과학회 2014 Journal of Chest Surgery (J Chest Surg) Vol.47 No.6
Background: Acute cerebral infarction is a major risk factor for postoperative neurologic complications in cardiac surgery. However, the outcomes associated with acute silent cerebral infarction (ASCI) have not been not well established. Few studies have reported the postoperative outcomes of these patients in light of preoperative Diffusion-weighted magnetic resonance imaging (DWI). We studied the postoperative neurologic outcomes of patients with preoperative ASCI detected by DWI. Methods: We retrospectively studied 32 patients with preoperative ASCI detected by DWI. None of the patients had preoperative neurologic symptoms. The mean age at operation was 68.8±9.5 years. Five patients had previous histories of stroke. Four patients had been diagnosed with infective endocarditis. Single cerebral infarct lesions were detected in 16 patients, double lesions in 13, and multiple lesions (>5) in three. The median size of the infarct lesions was 4 mm (range, 2 to 25 mm). The operations of three of the 32 patients were delayed pending follow-up DWI studies. Results: There were two in-hospital mortalities. Neurologic complications also occurred in two patients. One patient developed extensive cerebral infarction unrelated to preoperative infarct lesions. One patient showed sustained delirium over one week but recovered completely without any neurologic deficits. In two patients, postoperative DWI confirmed that no significant changes had occurred in the lesions. Conclusion: Patients with preoperative ASCI showed excellent postoperative neurologic outcomes. Preoperative ASCI was not a risk factor for postoperative neurologic deterioration.
이정한,류형태,천길정,Lee, Jeong-Han,Ryu, Hyeong-Tae,Cheon, Gil-Jeong 대한기계학회 1998 大韓機械學會論文集A Vol.22 No.1
In this paper, the dynamic characteristics of a star type epicyclic gear train have been analyzed. Nonlinear stiffness of a gear pair were obtained considering the bending and shear deformation, Hertz contact deformation, as well as tooth fillet deformation. Nonlinear stiffness coefficients and damping coefficients around the static equilibrium position were obtained by perturbation method. The loci of the planet gears and sun gear were estimated. Tooth meshing forces and bearing reaction forces were calculated. The effects of bearing clearance and oil viscosity on the gear behavior were also analyzed.
천길정,류형태 대한의용생체공학회 1998 의공학회지 Vol.19 No.3
설계방법론을 적용하여 새로운 기계식 인공심장판막을 설계 하였다. 심장판막의 기능을 정의하고 기능구조 결과에 따라 체계적인 설계변이 탐색을 수행하였으며, 이에 의하여 다양한 가능성을 검토하였다. 심장판막에 요구되는 제반 요구조건들을 기준으로 하여 최적 모델을 결정하였다. 설계된 심장판막의 시제품을 제작하여 모의순환계를 이용한 거동특성측정 실험을 수행하였다. 설계된 신규모델은 유량과 파형특성 및 거동특성면에서 대체로 양호한 결과를 보였다. A new mechanical heart valve prosthesis has been designed appling systematic design methodology. The function of the heart valve was defined, and search for design variation has been carried out according to the functional structure, Optimal model among the various variations was determined in view of the design specificationn. Proto type valve was fabricated and test has been carried out using a mock circulation system. It has been observed that the pressure profile, cardiac output and behavior characteristics are generally satisfactory.