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RISS 인기검색어
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- 저자 : 김영은(Y.-E. Kim) (검색결과 58 건)
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김영은(Y. E. Kim),윤상석(S. S. Yun) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
Although several artificial disc designs have been developed for the treatment of discogenic low back pain and used clinically, biomechanical change with its implantation seldom studied. To evaluate the effect of artificial disc implantation on the biomechanics of lumbar spinal unit, nonlinear three-dimensional finite element model of L1-L5, S1 was developed and strain and stress of vertebral body and surrounding spinal ligaments were predicted. Intact osteoligamentous L1-L5, S1 model was created with 1-㎚ CT scan of a volunteer and known material property of each element were applied. This model also includes the effect of local muscles which was modeled with pre-strained spring elements. The intact model was validated with reported biomechanical data. Two models implanted with artificial discs, SB Charite or Prodisc, at L4/5 via anterior approach were also developed. The implanted model predictions were compared with that of intact model. Angular motion of vertebral body, force on spinal ligaments, facet joint contact force with 2~12 Nm flexion-extension moment.
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유한요소 모델을 이용한 수직 충격력에 따른 경추의 응답특성해석
김영은(Y.E.Kim),박덕용(D.Y.Park),이춘기(C.K.Lee) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
The impact response of the whole cervical spine under dynamic loading conditions were investigated with a nonlinear three dimensional finlte element model. Finite element model of six motion segment. Consisted of two vertebral bodies with one disc. Were developed from 2mm thick transverse CT cross-sections and X-ray flim taken at lateral side. Annulus ground substance and nucleus were modeled poroelastic material to simulate its shock absorbing mechanism of the intervertebral disc. The cable elements were added to the annulus model to incorporate its fiber reinforced material property. Geometrical nonlinearity was also considered for the large deformation on the disc. ABAQUS package was used for calculation and ist results were verified comparing with the exixting in-vitro bxperimental data. The calculated deformation fattern of the post buckled mode was matched well with the in vitro experimental data. Moreover. Stress concentration pattern showed possible fracture at C5 which is frequently observed in clinical investigation.<br/>
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김영은(Y.E.Kim),김희석(H.S.Kim) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_2
Limited data exist which quantify the kinematic response of the human head and cervical spine in low-speed rear-end automobile collisions. The objectives of this study were to develop occupant model using commercial dynamics package DADS and to analyze the response of the occupant subject to rear-end collision. The developed model was verified by comparing with front collision results. The model shows its well agreement with the experimental data for Hybrid III and Hybrid III with RID neck for the cases △V of 8 and 16kph. Also resonable results could be obtained for 3 year child model.<br/>
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비선형 최소 자승법에 의한 추간판의 동적강성도 측정에 관한 해석
김영은(Y. E. Kim) 한국자동차공학회 1999 한국 자동차공학회논문집 Vol.7 No.1
A new method to predict dynamic stiffness of the intervertebral disc was proposed. The influence of frequency sensitive viscoelastic behavior, a main limitation in previous measurements, could be excluded in this analysis. Using the Levenberg Marquardt method, dynamic parameters in disc model have been obtained by curve fitting to measured dynamic stiffness<br/> S(ω) values of the disc. Among the several types disc model, three parameter model shows the most close agreement with a measurement for the artificial disc of the head-neck complex dummy in compression mode. Whereas Maxwell model reveals best fit in cases of flexion, extension and lateral bending mode.<br/>
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