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在可直接再利用品逆向物流网络现有研究的基础上,提出了一种既考虑了运输费用和固定投资费用之间的平衡(上层目标),又考虑了客户的自由选址行为(下层目标)的二层规划模型,并给出了具体解法,进行了数值分析,得到了满意的结果。 相似文献
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在可直接再利用品逆向物流网络现有研究的基础上,提出了一种既考虑了运输费用和固定投资费用之间的平衡(上层目标),又考虑了客户的自由选址行为(下层目标)的二层规划模型,并给出了具体解法,进行了数值分析,得到了满意的结果. 相似文献
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对影响设施设备布置的主要因素-物流因素和非物流因素进行了分析,以物流费用即设施设备之间的搬运费用最小为优化目标,构建了优化模型,结合实例考虑各个设备间的物料运输量及设备间的距离两个因素对运输总量的影响,进而重新调整各个设备间的相对位置,达到了生产物流系统优化的目标。 相似文献
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基于Lingo语言求解物流配送中心选址模型 总被引:6,自引:3,他引:3
首先针对物流配送中心选址的一般要求,以配送中心最小配送费用为目标,构造了混合整数规划选址模型。其次,结合物流配送中心选址实例,运用所建立的混合整数规划模型确定物流配送中心选址最佳方案。最后,借助优化建模软件LINGO,通过对实际问题的抽象建模,编写求解程序,成功求解了该模型。 相似文献
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对影响设施设备布置的主要因素-物流因素和非物流因素进行了分析,以物流费用即设施设备之间的搬运费用最小为优化目标,构建了优化模型,结合实例考虑各个设备间的物料运输量及设备间的距离两个因素对运输总量的影响,进而重新调整各个设备间的相对位置,达到了生产物流系统优化的目标. 相似文献
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《Socio》2023
To address the problems of duplicate construction, disorderly competition, small scale, and weak functionality, we examine the reorganization optimization of an inland river port group to realize its coordinated development. Considering port customers' decision-making behaviors, we propose a bilevel programming model for inland river port group reorganization based on niche theory. More specifically, an upper-level model is used to develop a reorganization plan, including the inland river port spatial layout and expansion extent, to maximize the value contributed by the port group to its region and industry and minimize the competition among the ports from the perspective of port management. More specifically, two upper-level objectives can be creatively measured by niche breadth and niche overlap. A lower-level model oriented to port customers aims to reduce their respective logistics costs by designing a transportation plan and providing feedback to the upper-level model to facilitate adjustments for port group reorganization. Since the dynamic interaction between the upper- and lower-level models significantly increases model complexity, we develop a hybrid heuristic algorithm by incorporating a genetic algorithm and an exact solution method. To verify the applicability of the proposed model and the efficiency of the developed hybrid approach, we conduct a series of numerical experiments on a real-world case study concerning Jining City, Shandong Province, China. Our case study also provides managerial insights into investment scale, land-use intensification, and the balance of planning objectives that may be useful for port managers. 相似文献
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文章对目前物流运输行业中货物运输车辆、人员、货物的安全监管、监控力度加以升级,引入新的解决方案,并对解决方案的系统进行阐述,对当今社会物流企业的安全监控、监管、高效、成本节约有实际性的意义。 相似文献
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以压缩货物运输时间为目的构建了优化铁路车流组织的双层规划模型。上层从铁路运输部门的角度出发,以全路车流组织成本最少为目标,考虑了技术站的编发能力限制、接车能力限制及编组去向预决策等约束条件,确定编组去向的开行方案。下层规划考虑货主的需求和利益,以各股车流的改编中转时间最短为目标压缩货物的运输时间,以流量平衡、车流组织形式的唯一性和技术站改编能力限制作为约束条件,形成车流改编接续方案并反馈回上层。采用模拟退火算法对双层规划模型进行求解,设计了退火计划表并阐述了算法流程,最后通过实际路网大规模案例验证了模型和算法的有效性。 相似文献
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随着我国城市化的快速推进,汽车工业的高速增长,在大城市交通拥堵已经成为一种普遍现象,城市经济发展的成本在显著上升。本文认为,应从控制汽车工业发展速度,增加行车成本,提高城市交通管理水平,推行机动车限行措施等方面发展城市公共交通,以实现城市经济的可持续发展。 相似文献
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Oscar Fisch 《Regional Science and Urban Economics》1975,5(2):263-277
This paper deals with the conflict between local and through traffic when allocating land for transportation at the expense of residential consumption. The model developed in this paper gives the optimal allocation of land between both uses, via Pontryagin's Maximum Principle, and shows the impact of through traffic on the urban structure, on local transportation costs and on the cost of housing supply. The cost functionals are used to measure the total burden to the inner city and a connection is made to the ongoing discussion of the ‘exploitation’ thesis. 相似文献
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《Socio》2016
Intelligent transportation systems are of great importance in urban traffic management. In this context variable message signs (VMS) play a major role in providing drivers with useful information during their trips.In this paper we consider the problem of finding the optimal location of a set of portable VMS on an urban network where flow patterns change during a time horizon.We propose two original solving approaches based on flow intercepting facility location ILP models.The paper presents an application of the proposed approaches to real-like test networks and discusses the results obtained providing some indications on their practical applications. 相似文献