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首先叙述了光纤传输Nd~(3+): YAG激光的优点,接着分析了不同光纤和其传输Nd~(3+): YAG激光的特点。然后通过对光纤传输系统各部分的分析与设计,结合实际,设计了光纤耦合机构。最后,对来自于工件反射光问题提出了解决方案。 相似文献
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优质农产品溯源系统的引入,既能提升有效供给、缩短流通时间,又能降低流通中的数量损耗和价值损失,由此带来了双渠道供应链系统在投资、销售、定价等方面的系列决策问题。考虑制造商开辟电子渠道、从溯源系统降低流通损耗和提高质量出发,分别构建制造商主导型的双渠道供应链决策模型。通过对比分析应用前后各成员在投资、定价及销售方面的最优策略,得到相关的核心边界值。数值仿真结果表明:核心边界值主要与双重损耗的改善程度及其他参数相关,各成员及系统接受溯源系统的应用成本不同,应用成本对各渠道销量的影响程度亦不相同,但各成员调整定价的应用成本边界值是一致的。 相似文献
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In this paper an estimation technique is developed on the basis of the well-known lognormal hypothesis for labour wastage to estimate the early leavers for each entry cohort. Early leavers are those leavers who joined and left the company during the twelve-month period and are not recorded at the census data taken at the end of this period. The results of applying the lognormal model on the extended data in predicting survivors for several companies are then shown to be improved. 相似文献
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首先叙述了光纤传输Nd^3 :YAG激光的优点,接着分析了不同光纤和其传输Nd^3 :YAG激光的特点。然后通过对光纤传输系统各部分的分析与设计,结合实际,设计了光纤耦合机构。最后,对来自于工件反射光问题提出了解决方案。 相似文献
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Manpower planning is an essential methodology for business and industry; it allows managers to make more efficient use of human resources. However, human behaviour is highly variable and it is therefore essential for manpower planning that population heterogeneity is successfully modelled. In this paper we review methods of incorporating population heterogeneity into manpower modelling. The analysis of differentials in a manpower system is emphasized since they are a source of aggregation error in stochastic models. Two strategies have been stressed, the use of observable sources of heterogeneity as they affect wastage, and the latent sources which cannot be identified precisely but are known to affect the key parameters of most models. Copyright © 2000 John Wiley & Sons, Ltd. 相似文献
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余兴无 《宁波大学学报(理工版)》2002,15(2):11-13
根据企业存货管理中的实际情况,将存货的变质损耗引入确定性存储模型中,由此得到了几个推广模型,并给出了这些模型的证明与求解过程。 相似文献
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