توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱A Model to Estimate Proportion of Nonconformance for Multicharacteristics Product
نویسنده(ها): ، ، ،
اطلاعات انتشار: ششمین کنفرانس بین المللی مدیریت، سال
تعداد صفحات: ۱۲
Today’s manufacturing and service industries are using quantitative measures such as proportion of nonconforming
products\services for quality assessment and continuous improvement endeavors. In any
industry there is a great deal of interest in quantitative measures of process performance for multiple
quality characteristics. It is well known that production processes very often produce products with quality
characteristics that do not follow normal distribution. In some cases fitting a known non–normal
distribution to these quality characteristics would be an impossible task. Furthermore, there is always more
than one quality characteristics of interest in process outcomes and very often these quality characteristics
are correlated with each other. In this paper we will use the geometric distance approach to reduce the
dimension of the correlated non–normal multivariate data and then fit Burr distribution to the geometric
distance variable. . The optimal parameters of the fitted Burr distribution are estimated using Compass
search method and Secant methods. The proportion of nonconformance (PNC) for process measurements is
then obtained by using the fitted Burr distributions based on the two methods. To assess the efficacy of the
two methods in estimating Burr parameters, the PNC results are then compared with the exact proportion of nonconformance of the data. Finally, a case study using real data is presented.<\div>

۲Modified Couple Stress Theory for Vibration of Embedded Bioliquid–Filled Microtubules under Walking a Motor Protein Including Surface Effects
اطلاعات انتشار: Journal of Solid Mechanics، هفتم،شماره۴، Autumn ۲۰۱۵، سال
تعداد صفحات: ۱۹
Microtubules (MTs) are fibrous and tube–like cell substructures exist in cytoplasm of cells which play a vital role in many cellular processes. Surface effects on the vibration of bioliquid MTs surrounded by cytoplasm is investigated in this study. The emphasis is placed on the effect of the motor protein motion on the MTs. The MT is modeled as an orthotropic beam and the surrounded cytoplasm is assumed as an elastic media which is simulated by Pasternak foundation. In order to consider the small scale effects, the modified couple stress theory (MCST) is taken into account. An analytical method is employed to solve the motion equations obtained by energy method and Hamilton’s principle. The influence of surface layers, bioliquid, surrounding elastic medium, motor proteins motion, and small scale parameter are shown graphically. Results demonstrate that the speed of motor proteins is an effective parameter on the vibration characteristics of MTs. It is interesting that increasing the motor proteins speed does not change the maximum and minimum values of MTs dynamic deflection. The presented results might be useful in biomedical and biomechanical principles and applications.
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