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《Socio》2023
As an abrupt epidemic occurs, healthcare systems are shocked by the surge in the number of susceptible patients' demands, and decision-makers mostly rely on their frame of reference for urgent decision-making. Many reports have declared the COVID-19 impediments to trading and global economic growth. This study aims to provide a mathematical model to support pharmaceutical supply chain planning during the COVID-19 epidemic. Additionally, it aims to offer new insights into hospital supply chain problems by unifying cold and non-cold chains and considering a wide range of pharmaceuticals and vaccines. This approach is unprecedented and includes an analysis of various pharmaceutical features such as temperature, shelf life, priority, and clustering. To propose a model for planning the pharmaceutical supply chains, a mixed-integer linear programming (MILP) model is used for a four-echelon supply chain design. This model aims to minimize the costs involved in the pharmaceutical supply chain by maintaining an acceptable service level. Also, this paper considers uncertainty as an intrinsic part of the problem and addresses it through the wait-and-see method. Furthermore, an unexplored unsupervised learning method in the realm of supply chain planning has been used to cluster the pharmaceuticals and the vaccines and its merits and drawbacks are proposed. A case of Tehran hospitals with real data has been used to show the model's capabilities, as well. Based on the obtained results, the proposed approach is able to reach the optimum service level in the COVID conditions while maintaining a reduced cost. The experiment illustrates that the hospitals' adjacency and emergency orders alleviated the service level significantly. The proposed MILP model has proven to be efficient in providing a practical intuition for decision-makers. The clustering technique reduced the size of the problem and the time required to solve the model considerably. 相似文献
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随着经济一体化的发展,企业实施供应链成本控制具有重要现实意义。文章通过对物料采购成本、订单管理成本、库存持有成本、信息管理成本、运输成本以及牛鞭效应等影响供应链成本控制因素分析,提出了供应链成本控制的五种优化途径。 相似文献
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大规模定制(MC)模式下的供应链调度优化过程,是典型的随机需求与资源约束的动态问题。为合理解决这一问题,在前期研究成果基础上,提出了包括供应商选择及企业合作时序安排的优化调度模型,并提出了针对这种模型的求解思路,设计了基于遗传算法的求解过程;通过多组数据实验及结果比较分析,对模型算法的有效性、稳定性进行了验证。 相似文献
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供应链库存管理是供应链管理的重要组成部分,如何设置和维持一个合理的订货量和库存水平量,以平衡存货不足带来的短缺风险和损失,以及库存过多所增加仓储成本和资金成本,成为一个企业必须回答的问题。本文从供应链整体角度出发,提出了在缺货费用很小以至于可忽略的前提下,适应供应链模式下,新的库存控制优化模型,并以简单实证加以研究。 相似文献
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目前,我国在绿色供应链的推广实施过程中存在一些问题,在这种情况下进行绿色供应链的研究对提高其运作效率,提高我国产品在国际市场的竞争力,以及保护环境和实施可持续发展战略具有一定的意义。文章阐述有关绿色供应链方面的内容,就其现状进行了分析,并在此基础上,借助博弈论这一工具,建立相关模型,对绿色供应链运作中的政府行为进行了分析。 相似文献
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目前,我国在绿色供应链的推广实施过程中存在一些问题,在这种情况下进行绿色供应链的研究对提高其运作效率,提高我国产品在国际市场的竞争力,以及保护环境和实施可持续发展战略具有一定的意义。文章阐述有关绿色供应链方面的内容,就其现状进行了分析,并在此基础上,借助博弈论这一工具,建立相关模型,对绿色供应链运作中的政府行为进行了分析。 相似文献
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供应链中多批次配送模型的优化 总被引:1,自引:0,他引:1
研究由单一制造商、单一分销商和单一产品组成的供应链中的协调订货决策问题。在每个订购周期内,产品分多批次配送至分销商处,模型确定了每次配送的产品数量以及每个生产周期内的配送次数,从而使供应链的总成本最小。 相似文献
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本文将Mi^Xi/Di/∞排队群引入供应链的订单装配模型中,采用启发式算法研究了稳态下基于组件基本存货水平、组件立即满足率的组件拖欠成本和持有成本的优化问题,从而找出了最优的组件基本存货水平,并给出了相应的数值例子. 相似文献
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系统观念是供应链管理的一个重要思想,它要求将供应链做为一个各环节相互联系的有机整体,而不是孤立的阶段.本文基于供应链管理的系统观念,将传统上孤立研究的运输商选择问题与配送中心选址问题结合起来,考虑供应链核心企业管理多个运输商的成本(文中称为C成本),建立运输商--配送中心联合优化模型[TDJOM],以实现供应链中这两个问题领域的联合优化,实现整体最优,同时设计了一种启发式算法,将非线性规划转为线性规划求解,避免了现有的各种非线性规划求解算法往往只能求得近似最优解的缺陷.本文用算例证明了模型和算法的有效性. 相似文献
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《Socio》2023
During the preparation before a hurricane makes landfall, affected individuals may be asked to evacuate. Large and small-scale evacuations can cause rapid increases in the demand for gasoline fuel. However, during a hurricane vessels carrying gas may be delayed and/or rerouted, adding to the difficulty of providing the necessary gas in affected areas. In this work, we determine alternate delivery locations and times for vessels carrying fuel that are scheduled to arrive and deliver fuel at ports impacted by an approaching hurricane. Motivated by Hurricane Irma in Florida, we develop a multi-period stochastic scheduling model that incorporates hurricane (weather) advisories, fuel delivery schedules, port storage capacities, and port docking capacities. Our model determines the best schedule based on two objectives: (1) minimize the total unmet demand at each port, and (2) minimize inequities in unmet demands among the ports. We also present a case study and a numerical experiment based on fuel delivery data from ports in Florida. Among our key findings is that port availability is the driving factor in determining feasible schedules for vessel gas deliveries. We also present a scheduling heuristic that dynamically adapts to weather advisories so as to minimize the impact of unmet demand in the affected areas. 相似文献
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以汽车制造供应链为研究对象,从工期风险的角度,建立供应链工期风险传递模型,分析当汽车制造供应链中关键链的某节点发生工期风险时,对上下节点的影响。为很好的控制供应链风险提供一个参考。 相似文献
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供应链集成下的企业采购管理 总被引:6,自引:1,他引:6
供应链集成下的采购管理是供应链管理的重要内容之一,基于供应链的采购管理模型利用现代信息技术的成果解决了供应链中核心企业与供应商之间的联系问题。供应链集成下的企业采购管理策略从本质上讲是一种理念,旨在提高采购管理的效率,降低企业采购的成本,建立新的供需合作模式。 相似文献
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文章分析了港口供应链物流管理模式现状及存在的问题,介绍了精益六西格玛管理思想的概念及特点,根据精益六西格玛思想对物流管理的影响与作用,提出了应用于港口供应链的精益六西格玛管理模式。 相似文献