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Abdominal aortic aneurysm in giant cell arteritis
Hyunwook Kwon,Youngjin Han,Da Hye Son,Yong-Pil Cho,Tae-Won Kwon 대한외과학회 2015 Annals of Surgical Treatment and Research(ASRT) Vol.89 No.4
Aortic complications of giant cell arteritis are a rare cause of abdominal aortic aneurysm. Here, we describe a case of a ruptured aortic aneurysm in a patient with giant call arteritis (GCA) who was preoperatively suspected of having an infectious aortic aneurysm. Intraoperative inspection revealed infectious granulation tissue on the anterior wall of the abdominal aorta. GCA was finally confirmed by pathological diagnosis. Our findings suggest that the surgical and postoperative treatment of nonatheromatous aortic aneurysm should be based on accurate diagnosis.
Hyojeong Kwon,Hyunwook Kwon,Joon Pio Hong,Youngjin Han,Hojong Park,Gi-Won Song,Tae-Won Kwon,Yong-Pil Cho 대한외과학회 2015 Annals of Surgical Treatment and Research(ASRT) Vol.89 No.1
Major peripheral arterial graft infection is a potentially devastating complication of vascular surgery, associated with significant mortality and high amputation rates. Autologous saphenous veins are considered optimal arterial conduits for lower extremity revascularization in infected fields, but they are often unavailable or unsuitable in these patients. This study describes two patients with major peripheral graft infection, but without available autologous veins, who underwent graft excision and cryopreserved cadaveric arterial allograft reconstruction. Although long-term graft durability is unclear because of gradual deterioration and degeneration, these findings suggest that cadaveric allografts may be good options for patients with major peripheral graft infection.
권영두(Youngdoo Kwon),김재용(Jaeyong Kim),이재관(Jaekwan Lee),권현욱(Hyunwook Kwon),한인식(Insik Han) 한국자동차공학회 2005 한국 자동차공학회논문집 Vol.13 No.1
Nowadays, various land of rubber-like materials are used in industry. These are usually installed in automobiles, trains, etc. They work as dampers or important parts in the system, and the applications for rubber-like materials are increasing. In the past days, rubber engineers and designers predicted rubber material behaviors by the analytic method for limited problems. With the progress of digital computers, Finite Element Methods is widely used for analyzing the rubber-like materials. The popular methods predicting rubber material property are curve fitting and least square method, but there are some problems such as low precision and tedious solving process. Here, we introduce a method estimating rubber material property by successive zooming genetic algorithm(SZGA). The proposed algorithm offers more precise rubber property. To demonstrate the effectiveness of the proposed algorithm, we compared this method with Haines & Wilson's method, MARC, ABAQUS.
Clinical outcomes of staged bilateral carotid endarterectomy for bilateral carotid artery stenosis
Amy Kim,Tae-Won Kwon,Youngjin Han,Sun U. Kwon,Hyunwook Kwon,Minsu Noh,Yong-Pil Cho 대한외과학회 2015 Annals of Surgical Treatment and Research(ASRT) Vol.89 No.5
Purpose: This retrospective cohort study aimed to determine the clinical outcomes of staged bilateral carotid endarterectomy (CEA) for bilateral internal carotid artery (ICA) stenosis performed with a short interval between the primary and secondary CEA procedures. Methods: In our institution, 574 consecutive patients underwent CEA between September 2007 and August 2014. Bilateral significant ICA stenosis was identified in 43 patients (7.5%) who underwent staged bilateral CEA within 30 days or less. Patients with unilateral CEA and staged bilateral CEA were compared in terms of CEA outcomes. The primary endpoint was the composite of any stroke, myocardial infarction, or death during the periprocedural period or ipsilateral stroke within 3 years after the CEA. Results: Staged bilateral CEA was not associated with ipsilateral stroke (P = 0.178) during postoperative follow-up. The two groups did not differ in terms of estimated 3-year primary endpoint rates (2.8% vs. 4.7%, P = 0.456) or ipsilateral strokefree (P = 0.225), any stroke-free (P = 0.326), or overall (P = 0.739) survival rates. Conclusion: Patients with bilateral significant ICA stenosis can undergo staged bilateral CEA within 30 days or less with outcomes that compare favorably with those of patients undergoing unilateral CEA.
A parallel MR imaging method using multilayer perceptron
Kwon, Kinam,Kim, Dongchan,Park, HyunWook Wiley (John WileySons) 2017 Medical physics Vol.44 No.12
<P>Conclusion: We have proposed a reconstruction method using machine learning to accelerate imaging time, which reconstructs high-quality images from subsampled k-space data. It shows flexibility in the use of k-space sampling patterns, and can reconstruct images in real time. (C) 2017 American Association of Physicists in Medicine</P>
Kwon, Min Jeong,Hahn, Jooyoung,Park, HyunWook Wiley Subscription Services, Inc., A Wiley Company 2008 INTERNATIONAL JOURNAL OF IMAGING SYSTEMS AND TECHN Vol.18 No.1
<P>The convoluted shape of the cerebral cortex makes it difficult to analyze and visualize the neuronal activation area. One way of overcoming this problem is to use a spherical inflation method to draw a cerebral cortex on a spherical surface. The task of mapping the cortical surface on a sphere has several obstacles, namely, the overlap between the polygons of the surface, the heavy computation demand, and the geometric distortions inherent in the process. This article proposes a method of mapping the three-dimensional (3D) cortical surface represented in a simplex mesh to a sphere surface, which does not have any overlap between the polygons and minimizes the geometric distortions as well as the computation time. The proposed method consists of the two steps of preprocessing and refinement. In the preprocessing step, the 3D cortical surface is mapped onto a sphere without any overlap between the polygons by iterative deformation. In the refinement step, the mapped surface is adjusted to minimize its linear distortion. The experimental results show the efficiency and performance of the proposed mapping method. © 2008 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 18, 9–16, 2008</P>
레이더에서 고고도 표적물의 고도 예측 성능 향상을 위한 한국형 지수 모델 개발에 관한 연구
문현욱(Hyunwook Moon),전민현(Min-Hyun Jeon),김우중(WooJoong Kim),오성근(Seong Keun Oh),이종현(Jong Hyun Lee),권세웅(Sewoong Kwon),윤영중(Young Joong Yoon) 한국전자파학회 2012 한국전자파학회논문지 Vol.23 No.7
본 논문에서는 레이더 이용 시 대기 굴절에 의한 고고도 표적물의 고도 오차를 최소화하기 위한 한국형 지수모델을 제안하였다. 이를 위해 한국 7개 기상 관측소에서 6년간 측정된 데이터를 바탕으로 표면 굴절도(surface refractivity)와 굴절도 감쇄율(refractivity gradient) 간의 상관 관계를 최소 자승법을 이용하여 도출하고, 이를 지수모델에 적용하였다. 또한, 제안된 모델의 검증을 위해 표준 대기(standard atmosphere) 모델, CRPL(Central Radio Propagation Lab.) 지수 모델, 제안된 한국형 지수 모델에 대한 고도 오차를 광선 추적법을 이용하여 도출하고, 그 특성을 분석하였다. 그 결과, 표준 대기 모델에 비해서는 50~60 %, CRPL 지수 모델에 비해서는 약 60 % 수준의 고도 오차를 나타내 제안된 모델을 적용 시 레이더의 고도 예측 성능을 향상시킬 수 있음을 확인하였다. In this paper, an exponential model of Korea is proposed to minimize an altitude-error of high-altitude target due to atmosphere refraction at radar system. The relation between surface refractivity and refractivity gradient, which is extracted using the least square fit from the measured data at 7 weather stations, is applied to the exponential model. And in order to verify the proposed model, the altitude-errors for a standard atmosphere, a CRPL(Central Radio Propagation Lab.) exponential model, the proposed model are extracted and analyzed using a ray tracing. As a result, the proposed model can improve the altitude estimation performance of radar compared to conventional atmosphere refractive index models.