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척추고정용 형상기억합금 동적안정기기의 생체역학적 성능 평가
김윤혁(Y. H. Kim),박원만(W. M. Park),김경수(K. Kim),박형균(H. K. Park),주증우(J. W. Joo),박경우(K. W. Park) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
In this study, a commercial fixation device, BioFlex, which was designed with shape memory alloy(SMA) for dynamic stabilization of spine was biomechanically evaluated. The finite element model of intact lumbar spine from L1 to S was developed using CT images. Also, four FE models of 2-level(L4-L5-S) and 3-level(L3-L4-L5-S) posteriori fixation using titanium(Ti) rod and BioFlex(SMA) rod. The rotations of bone segments in the intact model and four models were predicted. Although the rotations of the BioFlex fixation model were smaller than those of the intact model, they were relatively larger than those of Ti fixation. The present can be applied for not only evaluation of the stability of interbody fixator, but also development of new implant.
웨이퍼 휨에 대한 비접촉식 이송시스템의 유동-구조 해석
김병삼(B. S. Kim),박경우(K. W. Park),송연민(Y. M. Song) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
This wafer hand device with atmospheric pressure or chemical vapor deposition equipment for transporting and transferring wafers, robot hands carry these longer and wider wafers can also be easily handled. As a contact handling system composed of several problems in increased potential for fracture or warping. A non contact handling system is required to solve this problem. The wafer warping makes it difficult to carry out conventional contact to analysis. We propose a new non contact transportation system with combining air suction and blowout. The numerical analysis and experimental is, therefore, should be performed to obtain compared to results achieved with non contact solutions. This wafer non contact handler shows its strength in maintaining high cleanliness levels for semiconductor production processes. The numerical analysis and experimental is, therefore, should be performed to obtain compared to results achieved with non contact solutions.