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골시멘트 특성 및 스템 형상에 따른 시멘트 타입 인공관절의 생체역학적 평가
박흥석,전흥재,윤인찬,이문규,최귀원,Park, H.S.,Chun, H.J.,Youn, I.C.,Lee, M.K.,Choi, K.W. 대한의용생체공학회 2008 의공학회지 Vol.29 No.3
The total hip replacement (THR) has been used as the most effective way to restore the function of damaged hip joint. However, various factors have caused some side effects after the THR. Unfortunately, the success of the THR have been decided only by the proficiency of surgeons so far. Hence, It is necessary to find the way to minimize the side effect caused by those factors. The purpose of this study was to suggest the definite data, which can be used to design and choose the optimal hip implant. Using finite element analysis (FEA), the biomechanical condition of bone cement was evaluated. Stress patterns were analyzed in three conditions: cement mantle, procimal femur and stem-cement contact surface. Additionally, micro-motion was analyzed in the stem-cement contact surface. The 3-D femur model was reconstructed from 2-D computerized tomography (CT) images. Raw CT images were preprocessed by image processing technique (i.e. edge detection). In this study, automated edge detection system was created by MATLAB coding for effective and rapid image processing. The 3-D femur model was reconstructed based on anatomical parameters. The stem shape was designed using that parameters. The analysis of the finite element models was performed with the variation of parameters. The biomechanical influence of each parameter was analyzed and derived optimal parameters. Moreover, the results of FE A using commercial stem model (Zimmer's V erSys) were similar to the results of stem model that was used in this study. Through the study, the improved designs and optimal factors for clinical application were suggested. We expect that the results can suggest solutions to minimize various side effects.
FEM을 이용한 cement type hip implant의 stem 단면형상에 따른 응력분석
박흥석(H. S. Park),이문규(M. K. Lee),전흥재(H. J. Chun),최귀원(K. W. Choi) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
The choice of suitable hip implant is one of important factors in total hip replacement (THR). In clinical view points, improper adaptation of hip implant might cause abnormal stress distribution to the bone, which can shorten the lifespan of replaced hip implant. Currently, interest in custom-designed hip implants has increased as studies reveals the importance of geometric shape of patient"s femur in modeling and designing custom hip implants. In this study, we have developed the custom-designed hip implant models with various sizes in hip implant, and the stress distribution in the bone was analyzed using Finite Elements methods. It was found that minimizing the gap between implant stem and femoral cavity is crucial to minimize stress concentration in the bone.
박흥석(H. S. Park),강지원(J. W. Kang),장태인(T. I. Jang),김형호(H. H. Kim),석광현(K. H. Suk),최경규(K. K. Choi),오장만(J. M. Oh) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
최근 국내에서 가스절연송전선(GIL : Gas Insulated Transmission Line)의 실계통 도입을 위하여 345㎸급 GIL의 개발 및 적용을 위한 연구 및 검토가 수행되고 있다. 가공선로의 일부구간을 GIL로 대치하는 데 있어서, 변전소측이 원거리일 경우에는 변전소 내부의 차단기나 단로기 등 개폐 써지에 의한 과전압의 영향은 감쇄효과로 인하여 그다지 크지 않지만, 현재 설치 예정선로와 같이 변전소 측과의 거리가 약 2.6[㎞]로 짧을 경우 차단기 동작에 의한 개폐써지의 영향을 무시할 수 없게 된다. 따라서 본 논문에서는 GIL 시스템이 가공송전선로와 연계된 경우 근접한 변전소단에서 개폐를 가정하였을 때, GIL 시스템과 가공송전선로에서 발생할 수 있는 개폐과전압에 대하여 과도해석 프로그램인 EMTP를 이용하여 검토하였다.
Porous Calcium Silicate 및 Zeolite가 계분 유해가스 발생에 미치는 영향
전병수,최희철,김태일,권두중,노환국,강희설,김형호,한정대,최롱,박흥석,Jeon, B.S.,Choi, H.C.,Kim T.I.,Kwon, D.J.,Rho, W.G.,Kang, H.S.,Kim, H.H.,Han, J.D.,Choi, L.,Park, H.S. 한국축산환경학회 2001 축산시설환경학회지 Vol.7 No.1
In this experiment porous calcium silicate (PCS) powder prepared by using a 50 mesh sieve was spread on top of chick droppings to investigate the odor from the manure. Zeolite was used as a comparative purpose. Reduction in ammonia production from chick droppings shortly after the PCS and zeolite application was evident (P<0.05), but there were no difference among treatments afterwards. hydrogen sulfide level was significantly lowered by both PCS and zeolite treatment(P<0.05).
기재홍,서덕찬,박흥석,윤인찬,이문규,유선국,최귀원,Key, J.H.,Seo, D.C.,Park, H.S.,Youn, I.C.,Lee, M.K.,Yoo, S.K.,Choi, K.W. 대한의용생체공학회 2006 의공학회지 Vol.27 No.6
Image Guided Surgery (IGS) system which has variously tried in medical engineering fields is able to give a surgeon objective information of operation process like decision making and surgical planning. This information is displayed through 3D images which are acquired from image modalities like CT and MRI for pre-operation. The technique of image registration is necessary to construct IGS system. Image registration means that 3D model and the object operated by a surgeon are matched on the common frame. Major techniques of registration in IGS system have been used by recognizing fiducial markers placed on the object. However, this method has been criticized due to additional trauma, its invasive protocol inserting fiducial markers in patient's bone and generating noise data when 2D slice images are acquired by image modality because many markers are made of metal. Therefore, this paper developed shape-based registration technique to improve the limitation of fiducial marker based IGS system. Iterative Closest Points (ICP) algorithm was used to match corresponding points and quaternion based rotation and translation transformation using closed form solution applied to find the optimized cost function of transformation. we assumed that this algorithm were used in Total Knee replacement (TKR) operation. Accordingly, we have developed region-based 3D registration technique based on anatomical landmarks and this registration algorithm was evaluated in a femur model. It was found that region-based algorithm can improve the accuracy in 3D registration.