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실험계획법과 반응표면법을 이용한 효율적인 신뢰도 기법의 개발
이상훈(S. H. Lee),곽병만(B. M. Kwak) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
A reliability analysis and design procedure based on the design of experiment (DOE) is combined with the response surface method (RSM) for numerical efficiency. The procedure established is based on a 3<SUP>n</SUP> full factorial DOE for numerical quadrature using explicit formula of optimum levels and weights derived for general distributions. The full factorial moment method (FFMM) shows good performance in terms of accuracy and ability to treat non-normally distributed random variables. But, the FFMM becomes very inefficient because the number of function evaluation required increases exponentially as the number of random variables considered increases. To enhance the efficiency, the response surface moment method (RSMM) is proposed. In RSMM, experiments only with high probability are conducted and the rest of data are complemented by a quadratic response surface approximation without mixed terms. The response surface is updated by conducting experiments one by one until the value of failure probability is converged. It is calculated using the Pearson system and the four statistical moments obtained from the experimental data. A measure for checking the relative importance of an experimental point is proposed and named as influence index. During the update of response surface, mixed terms can be added into the formulation.
최적설계 기법을 이용한 초정밀 비구면 렌즈 가공기 베드의 구조설계
이일랑(I. L. Yi),박수진(S. J. Park),이규봉(G. B. Lee),이석우(S. W. Lee),유용균(Y. G. Yu),곽병만(B. M. Kwak),백승엽(S. Y. Baek) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
The precision fabrication of aspherical lenses is increasingly required for the latest applications of compact and high resolution video-recording or camera systems. Micro-optical components, including micro-spherical or aspherical lenses and reflecting mirrors, are generally required to be manufactured with high shape accuracy, extremely low surface roughness and no surface damage. To meet the needs of the precision fabrication system, a bed which supports the micro aspherical lens fabrication machines stably and safely is required. In this study, the thickness of the ribs of the bed is optimized using the CAD integrated optimal design system, a virtual DS program.
접합에 의한 대칭 질량형 실리콘 미소가속도계의 설계,제작 및 시험
고종수(J. S. Ko),조영호(Y.-H. Cho),곽병만(B. M. Kwak),이호준(H. J. Lee),박관흠(K. H. Park) 한국자동차공학회 1999 한국 자동차공학회논문집 Vol.7 No.1
This paper presents the design, batch-fabrication and testing of a piezoresistive cantilever beam microaccelerometer for automobile airbag applications. Silicon proof-mass has been bonded symmetrically for self-diagnostic capability and zero transverse sensitivity of the microaccelerometer. Microfabrication process, including a simple silicon etch-stop method for beam thickness control, has been developed for mass production lines. Fabricated devices show a resonant frequency of 2.15kHz and a sensitivity of 34μV/g/V with a nonlinearity of 2% at 100Hz. The present fabrication processes provide simple, practical and effective means for the reproducibility and mass production of the accelerometers.<br/>
고종수(J. S. Ko),김규현(K. H. Kim),이창렬(C. Y. Lee),조영호(Y. H. Cho),이귀로(K. R. Lee),곽병만(B. M. Kwak) 한국자동차공학회 1996 한국 자동차공학회논문집 Vol.4 No.5
A silicon microaccelerometer is designed and fabricated using silicon epitaxial layers for auto motive electronic airbag applications. A cantilever structure is chosen for high sensitivity and a pidetection method is adopted for circuit simplicity and low cost. An optimum design is used to find optimum microstructure sizes for maximum sensitivity subject to performance requirements and design constraints on natural frequency, damping ratio, maximum allowable stress and microfabrication limitations. The microaccelerometer is fabricated by micromachining processing steps, composed of material-selective and orientation-dependent chemical etching techniques. Fabricated prototype shows a sensitivity of 88.6μV /g within a resonant frequency of 1.75kHz Estimated performance of the microaccelerometer is compared with measured one. Discrepancy between the theoretical values and the experimental values is discussed together with possible sources of the errors.<br/>