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对如何在某地区建立分级的、多灾难情景下的资源布局进行了分析,提出了双层规划的数学模型,并给出了基于粒子群算法的模型求解方法,最后通过算例验证了模型和算法的有效性。 相似文献
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针对非常规突发事件中应急资源布局问题,在受灾点需求不确定和应急救援过程分为多个阶段的情景下,建立了省市两级应急储备仓库定位和物资配置的鲁棒双层规划模型。运用相对鲁棒优化方法,将上述具有不确定性系数的双层规划模型转化为从者无关联的确定性线性双层规划,提出了一种混合遗传算法进行求解,实现了省市两级应急资源布局的协同优化。通过实例验证了模型及算法的可行性和有效性。 相似文献
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当前,企业的快速
发展规模迅速膨胀,企
业的存储系统会面对越
来越多的挑战:数据的
指数级增长、存储平台
日益复杂、管理多类型,
多种品牌存储设备上的
数据、预算紧张、使用针
对各个点的解决方案解
决全面问题、发挥现有
存储投资的作用、用I 相似文献
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BBU集中化组网能够有效地提高无线网络资源利用率,加快网络建设速度,降低运营成本,动态地解决无线业务迁移问题。通过分析BBU基带池集中化的技术及其特性,结合网络建设实际应用,提出BBU集中化组网建议。 相似文献
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产品研发是企业的创新行为,与项目的“临时性”和“独特性”特点相匹配,因此,项目管理在产品研发中得到了广泛的应用,中国移动研究院的产品研发项目管理就是一个典型的案例。 相似文献
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分级的混合模式布局算法 总被引:1,自引:0,他引:1
针对混合模式的布局问题提出一种分级的自动布局算法.所谓混合模式就是标准单元和宏模块相结合的布局模式.该算法在模块级和单元级两个层次上完成布局.在模块级上,首先将所有随机单元划分成若干软模块,然后采用基于序列对(sequence pair,简称SP)的方法完成模块布局;在单元级上,首先对每个软模块内部采用二次规划的布局算法进行布局,然后在全芯片范围内对布局进行改善,最后采用一种基于最小割(min-cut)和枚举相结合的快速详细布局算法完成最终布局.在一组标准单元数和宏模块数不同的电路上对该算法进行了验证,效果是令人满意的. 相似文献
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本文从学校办公网络管理的现状出发,对目前学校办公网络的应用和管理进行客观的分析,阐述Windows Server2003域控制器和活动目录在校园办公网络集中化管理中的实际应用。 相似文献
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对于多行设备布局问题,通过对搬运车辆运行情况的分析,建立的模型中以搬运设备的重载运行和空载运行的费用之和最小作为目标函数,设计了相应的遗传算法来求解。通过一个实例进行了模拟计算,进一步与原有模型的仿真结果进行了比较。比较结果说明了利用该模型得到的设备布置方案要优于采用原有模型得到的布置方案。 相似文献
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研究竞争环境下截流设施选址与带时间窗的多中心车辆路径问题。首先,在考虑设施覆盖范围衰退的情况下,利用阶梯型效用函数和偏离距离描述消费者的选择行为,并确定截流设施的需求量;然后,采用基于聚集度的启发式算法对门店进行分类,借助双层规划法,建立门店选址与车辆路径安排的多目标整数规划模型;最后,采用改进的蚁群算法进行求解。通过分析对比实验结果,验证了模型的有效性和可行性。 相似文献
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Ali Taghavi Alper Murat 《Computers & Industrial Engineering》2011,61(1):55-63
We present an efficient iterative heuristic procedure for solving the integrated layout design and product flow assignment problem. The layout design decisions involve planar location of unequal-area machines with duplicates. The product flows are assigned to machines according to the product processing routes. The integrated decision problem is a nonlinear mixed integer model which cannot be efficiently solved using classical methods for large problems. We propose a novel integrated heuristic procedure based on the alternating heuristic, a perturbation algorithm and sequential location heuristic. Since the alternating heuristic between facility layout design and product-machine assignment sub-problems terminates with local optima, we developed a perturbation algorithm based on assignment decisions. The results of an experimental study show that proposed procedure is both efficient and effective in identifying quality solutions for small to very large-sized problems. 相似文献
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Multi-floor layout problem (MFLP) can be categorized as one of the most crucial basic problems in the real world especially in the field of plant layout design. Specially, the aim of this problem is to find the locations of each department, storage, and elevator in the floors of a multi-floor building and without overlapping to minimize the total material handling cost. In order to consider practical issues in theory and presenting an applicable problem, for the first time in the published literature for MFLP, we develop a robust mathematical model indiscrete and uncertain environment in which some parameters can be changed in predetermined intervals. In fact, one of the most considerable factors is material flow among departments and storages which is assumed to have uncertain values rather than fixed amounts. In this study, we develop a Mixed Integer Programming (MIP) robust model for a new form of MFLP, we called MFDLP where the cellar is considered to contain main storages and upper floors in which departments will be located in predetermined locations. Moreover, there is an elevator set for transferring materials between floors and should be located without overlapping with departments and storages. Finally, the presented model is tested and assessed on some problems and its efficiency is shown. 相似文献
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库存与配送在整个物流过程中承担着重要作用,由于二者间存在“效益悖反”关系,使得对库存与配送整合优化问题极为复杂。针对所述问题运用双层规划上下层“博弈”特点建立模型,并讨论了模型的求解算法,结合分层迭代的思想给出一个有效算法。最后基于Maple编程并结合实例对模型进行仿真计算。 相似文献
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为减轻轨检车振动对车载视觉测量系统动态测量钢轨轮廓的不利影响,提出一种基于轮廓曲线特征点和最近点迭代算法ICP(Iterative Closest Point)的数据校准方法。通过识别动态轮廓曲线的特征点,完成数据初步校准,然后利用ICP算法确定初步校准数据与标准数据之间的变换矩阵,实现动态数据最终校准。最后通过实验模拟了振动对测量的影响。实验结果表明:在垂磨和侧磨测量点处,校准后数据与标准数据偏差值的标准差分别为0.088 mm、0.085 mm,取置信水平为0.99时,校正精度分别为±0.227 mm、±0.219 mm,该方法有较好的精度,可应用于工程测量。 相似文献
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To meet the growing demand in railway transportation, practitioners are more and more required to upgrade or substitute the signalling system in order to increase the capacity of the network. Existing approaches for the design of the signalling layout, usually tend to maximize the technological efficiency of the system by shortening the length of block sections, thus reducing the minimum line headway and the energy consumption but increasing investment costs. This paper presents a design approach addressed to identify the signalling layout which minimizes the investment and management costs, while respecting the required level of capacity. To solve this problem an innovative design framework is introduced which integrates a stochastic multi-train simulation model within a “black-box” optimization loop. Results obtained from an application to a real metro line confirm the effectiveness of such method in finding the solution which minimizes total costs for the line manager. A comparison with the block layout which maximizes the technological efficiency highlights that the obtained solution constitutes a satisfying trade-off between total costs and network performances. 相似文献
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