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This article studies a firm that procures a product from a supplier. The quality of each product unit is measured by a continuous variable that follows a normal distribution and is correlated within a batch. The firm conducts an inspection and pays the supplier only if the product batch passes the inspection. The inspection not only serves the purpose of preventing a bad batch from reaching customers but also offers the supplier an incentive to improve product quality. The firm determines the acceptance sampling plan, and the supplier determines the quality effort level in either a simultaneous game or a Stackelberg leadership game, in which both parties share inspection cost and recall loss caused by low product quality. In the simultaneous game, we identify the Nash equilibrium form, provide sufficient conditions that guarantee the existence of a pure strategy Nash equilibrium, and find parameter settings under which the decentralized and centralized supply chains achieve the same outcome. By numerical experiments, we show that the firm's acceptance sampling plan and the supplier's quality effort level are sensitive to both the recall loss sharing ratio and the game format (i.e., the precommitment assumption of the inspection policy). © 2013 Wiley Periodicals, Inc. Naval Research Logistics, 2013 相似文献
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军港人工保障模式已很难适应现代信息化战争对舰艇的实时、精确、高效、可靠保障要求。文章基于物联网的理念和技术,构建了具有需求自感知能力的军港岸基保障物联网系统,将业务需求数据、实时保障数据、保障过程视频等保障信息汇集融合到一个统一的平台上,实现了保障人员对保障过程的可视化、透明化的监视和控制。文章首先分析了军港岸基保障流程及其特点,定义了军港岸基保障物联网系统的概念模型,给出了其总体功能框架,在此基础上,讨论了军港岸基保障物联网系统的硬件结构和软件模型。军港岸基保障物联网系统已在某大型军港获得成功应用。 相似文献
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In 2000, Klein showed that bidirectional scheduling schemes (bidss) outperform single‐directional scheduling schemes (e.g., forward or backward schemes). In 2010, Yoosefzadeh, et al. [J Math Model Algor 9 (2010), 357–373] showed that depending on the nature of the problems and also the type of priority rules used, schedules produced by a so‐called tridirectional scheduling scheme (trdss) yields shorter makespans when compared to forward, backward, and even bidss. Since the justification technique is applied in many of the state‐of‐the‐art algorithms nowadays, we show that the tuned version of the trdss outperforms the double justification technique. Moreover, we investigate the circumstances under which the trdss is more probable to generate schedules with shorter makespans. To this end, we introduce a new measure of resource requirements and their distributions, namely total amount of overflows. Our analytical as well as empirical investigations show that when the new measure is increased, it is more probable to obtain schedules with shorter makespans using the trdss. © 2013 Wiley Periodicals, Inc. Naval Research Logistics 61: 44–55, 2014 相似文献
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某型柴油机进气道通流特性试验研究 总被引:5,自引:1,他引:4
分析了某型柴油机气缸盖进气道流量系数和涡流比随气阀升程的变化规律,以及进气道前后的压差对流量系数和涡流比的影响.试验结果表明,该型柴油机进气系统在低负荷时可以实现较大的涡流比,从而可以改善柴油机低负荷性能. 相似文献
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Su-wei Wang Xiu-duo Song Zong-kai Wu Lei Xiao Guang-pu Zhang Yu-bing Hu Ga-zi Hao Wei Jiang Feng-qi Zhao 《防务技术》2021,17(6):1954-1966
The frequent occurrence of safety accidents during the calendering process is caused by the flammable and explosive properties of composite modified double-base (CMDB) propellant. Optimization of process parameters with the aid of fluid simulation technology could effectively ensure the safety of the calendering process. To improve the accuracy of the simulation results, material parameters and model structure were corrected based on actual conditions, and adaptive grid technology was applied in the local mesh refinement. In addition, the rheological behavior, motion trajectories and heat transfer mechanisms of CMDB propellant slurry were studied with different gaps, rotational rates and temperatures of two rollers. The results indicated that the refined mesh could significantly improve the contour clarity of boundaries and simulate the characteristics of CMDB propellant slurry reflux movement caused by the convergent flow near the outlet. Compared with the gap, the increased rotational rate of roller could promote the reflux movement and intensify the shear flow of slurry inside the flow region by viscous shear dragging. Meanwhile, under the synergistic effect of contact heat transfer as well as convective heat exchange, heat accumulated near the outlet and diffused along the reflux movement, which led to the countercurrent heat dissipation behavior of CMDB propellant slurry. The plasticizing mechanism of slurry and the safety of calendering under different conditions were explored, which provided theoretical guidance and reference data for the optimization of calendering process conditions. Based on the simulation results, the safety of the CMDB propellant calendering process could be significantly improved with a few tests conducted during a short research and development cycle. 相似文献
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为了实现对高阶二进制偏移载波(BOC)信号的无模糊和抗多径接收,将码相关参考波形的闸波设计思路应用于GNSS双载波环路接收方法的副载波锁相环。在副载波锁相环中引入设计的闸波参与信号的相干积分过程,使双载波环法具备抗多径性能且不需要额外引入相关器。对该设计方法的理论和具体实现进行阐述和分析,从副载波多径误差包络和跟踪精度两方面对改进的双载波环路方法性能进行评估。仿真结果显示,采用的算法与双载波环路法相比,可以降低BOC(1,1)信号81.1%的副载波多径误差包络面积以及BOC(14,2)信号75.1%的副载波多径误差包络面积。但是,改进的双载波环路法会带来-6 dB的相干积分后载噪比损失,降低跟踪精度。因此,在闸波参数设计上,需要谨慎选择以平衡算法的多径抑制和跟踪精度性能。综合来看,该方法适用于解决非弱信号条件下及多径环境下的高阶BOC信号接收问题。 相似文献
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研究了一种在更换时间有限的情况下 ,基于交替更新过程的双参数批更换系统的优化问题 ,这一问题的目标是平均费用率的极小化。给出了一种特殊情况的讨论结果。 相似文献
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对双连杆机构的运动学进行了理论分析,推导出了活塞的位移、速度和加速度公式及活塞侧连杆和曲轴侧连杆摆角公式,并且针对一实例进行了计算,与相同结构尺寸的传统曲柄连杆机构发动机作了比较分析. 相似文献
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