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981.
We consider a production system comprising multiple stations (or workshops) such as an entry station, a set of work stations, a central station, and an exit station, which are arranged in a general configuration. A worker (or a vehicle tool) is assigned to each station, who sends a part from the station to the destination station according to the required process path of the part. Any part is allowed to visit a work station more than once if its process path requires. We propose a new control strategy with the push policy for instructing each worker to send a part and the kanban mechanism for controlling the work‐in‐process (WIP) in each work station. As all work stations have limited local buffers, the central station is used for storing blocked parts temporarily. Such a production system is modeled as an open queueing network in a general configuration with a Markovian part sending policy and a machine no blocking mechanism. The queueing network is analytically characterized. Some important performance measures are compared with other control strategies. A semi‐open decomposition approach is applied to the queueing network for computing the blocking probabilities when parts arrive at the work stations. An algorithm is developed based on the semi‐open decomposition approach. Numerical experiments show the quality of the solutions obtained by the algorithm as well as a property of a performance measure. © 2001 John Wiley & Sons, Inc. Naval Research Logistics 48: 128–143, 2001 相似文献
982.
BP网络在火灾形势预测中的应用 总被引:1,自引:0,他引:1
分析将BP网络应用于火灾预测研究的可行性与优势 ,并将神经网络与时间序列分析相结合 ,对火灾形势预测进行探讨 相似文献
983.
风险传递过程中,耦合是导致风险突变的重要原因。为提供风险耦合控制方法,给出风险耦合的形式化描述,采用风险耦合弹性系数对耦合强度进行计算;基于Arena软件对某型非致命武器设计论证阶段的进度风险和费用风险之间的耦合特性进行仿真分析,分别仿真了单指标、多指标在线性和非线性耦合情形下的系统行为,结果表明:全局性的线性耦合和高强度非线性耦合能显著改变系统行为。相关结果为风险耦合控制策略的制定提供了参考。 相似文献
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We consider the problem of placing sensors across some area of interest. The sensors must be placed so that they cover a fixed set of targets in the region, and should be deployed in a manner that allows sensors to communicate with one another. In particular, there exists a measure of communication effectiveness for each sensor pair, which is determined by a concave function of distance between the sensors. Complicating the sensor location problem are uncertainties related to sensor placement, for example, as caused by drifting due to air or water currents to which the sensors may be subjected. Our problem thus seeks to maximize a metric regarding intrasensor communication effectiveness, subject to the condition that all targets must be covered by some sensor, where sensor drift occurs according to a robust (worst‐case) mechanism. We formulate an approximation approach and develop a cutting‐plane algorithm to solve this problem, comparing the effectiveness of two different classes of inequalities. © 2015 Wiley Periodicals, Inc. Naval Research Logistics 62: 582–594, 2015 相似文献
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精确保障的理论研究与发展 总被引:9,自引:1,他引:9
根据未来信息化战争的新特点,探讨了适应信息化战争保障需求、基于信息网络技术、资源重构技术、柔性保障机制和系统理论的精确保障的内涵,研究归纳出当今美军装备保障的特点、提出精确保障的理论研究应该充分借鉴系统理论、网络中心战理论、敏捷制造理论的先进思想,指出了我军精确保障实现的途径以及应该遵循的原则. 相似文献