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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.
신현수(H.-S. Shin),전흥재(H.-J. Chun),최흥섭(H. S. Choi) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.3
There are many practical situations where electromagnetic waves interact with composite materials. The knowledge of interaction of electromagnetic waves in composite structures is important for designing the shielding structure for antenna such as radome. Recently, radomes are constructed in the form of foam core sandwich structures that have many mechanical advantages such as high strength, long fatigue life, low density and adaptability to the intended function of structure. However, the propagation of electromagnetic waves is affected by high anisotropic permeability and loss tangent of the composite skin. Even though many investigations were focused on the propagation of electromagnetic waves through composite materials in the 2D plane in last several decades, little investigations were carried out to understand adequately the propagation of the electromagnetic waves as function of incident angle in the foam core sandwich structures. In this paper, the analytical 3D model and method to predict the propagation of electromagnetic waves through the foam core sandwich structures were proposed.
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.