共查询到20条相似文献,搜索用时 297 毫秒
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对机器维修保养所需备件的订货策略进行了研究,基于备件的可得性和消耗率,将备件分为四类:关键备件、重要备件、一般备件和特殊备件,针对不同的备件,给出了不同的订货策略。 相似文献
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针对战时装备分散配置,随装备件与运行备件的使用方法不同的特点,本文对运行备件保障率进行了分析,将备件运行量优化问题理解为特殊的二级备件保障问题,建立了基于随装备件的运行备件保障率模型,给出了运行备件最优数量的通用计算公式。并给出了实例分析,验证了模型和算法,为装备分散配置的部队确定运行备件数量提供了决策依据。 相似文献
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对备件进行科学合理的分类是有效解决诸多备件管理问题的第一步。文章从H公司起重设备维修备件分类现状入手,基于传统ABC分类法,定义了备件关键性评价指标CRI,通过评估计算,将H公司起重设备维修备件进行了关键性ABC分类,为备件的管理打下了基础。 相似文献
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本文对剩余作战使用时间和备件获取时间进行分析,选定剩余作战使用时间为备件申请的约束条件。根据给定备件保障率,建立了备件申请时机和申请量模型,给出了计算公式。通过举例分析,验证了模型和算法。为战时备件申请问题提供了决策依据。 相似文献
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分析了连续生产模式下备件管理的特殊性,讨论了相关性最强的四个备件控制特征备件重要性、通用性、需求模式和价格。针对备件不同的控制特征组合,以连续生产模式下的电站为例,详细分析了相应的备件物流优化策略。 相似文献
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汽车企业备件物流改善 总被引:2,自引:0,他引:2
介绍了汽车企业备件物流组织机构演变、备件工业化等领域管理模式的改善,阐述了构建备件物流能力需求预测的方法,概述了备件物流降库存等运作模式改善方法,并展望了未来物流改善的方向 相似文献
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通过剖析煤炭企业备件管理的现状,发现主要是由于备件库存管理落后且存在较多问题,才导致了煤炭企业备件库存逐年增长、居高不下,大量占用库存储备资金。因此,通过对现行备件库存管理模式的比较分析,结合煤炭企业备件管理的特点,提出了基于VMI的区域煤炭企业备件实体联合库存储备策略,并进一步给出了该模式下的实施策略及应用优势。 相似文献
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通过梳理电力物资需求预测中存在的真实需求和计划需求、物资出库量和真实需求的不一致,以及电力物资需求的内外部影响问题,提出基于影响因素多维融合与贝叶斯概率更新的电力物资需求预测方法。首先分析了电力物资需求的内外部影响因素及其筛选,并按其对需求预测的影响程度进行权重赋值;其次设计了影响因素多维融合与贝叶斯概率更新的电力物资需求预测框架,介绍了贝叶斯概率更新的需求预测流程步骤;最后以温州市10kv配网项目的电力电缆需求预测为例进行算例说明。应用算例表明该方法能有效反映需求因素对电力物资需求变动的影响,符合电力物资需求特性,且具有很强的拓展性。 相似文献
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《International Journal of Forecasting》2022,38(1):209-223
Retailers supply a wide range of stock keeping units (SKUs), which may differ for example in terms of demand quantity, demand frequency, demand regularity, and demand variation. Given this diversity in demand patterns, it is unlikely that any single model for demand forecasting can yield the highest forecasting accuracy across all SKUs. To save costs through improved forecasting, there is thus a need to match any given demand pattern to its most appropriate prediction model. To this end, we propose an automated model selection framework for retail demand forecasting. Specifically, we consider model selection as a classification problem, where classes correspond to the different models available for forecasting. We first build labeled training data based on the models’ performances in previous demand periods with similar demand characteristics. For future data, we then automatically select the most promising model via classification based on the labeled training data. The performance is measured by economic profitability, taking into account asymmetric shortage and inventory costs. In an exploratory case study using data from an e-grocery retailer, we compare our approach to established benchmarks. We find promising results, but also that no single approach clearly outperforms its competitors, underlying the need for case-specific solutions. 相似文献
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安徽省能源需求的组合预测 总被引:1,自引:0,他引:1
根据预测理论,结合安徽省历年能耗的数据,在建立能源需求单项预测模型的基础上,建立组合预测模型,对2008~2014年的能源需求量进行预测。结果表明:组合预测模型的精度高于单项预测模型;安徽省能源需求量正以较快的速度在增长。 相似文献
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《International Journal of Forecasting》2003,19(1):57-70
Weather forecasts are an important input to many electricity demand forecasting models. This study investigates the use of weather ensemble predictions in electricity demand forecasting for lead times from 1 to 10 days ahead. A weather ensemble prediction consists of 51 scenarios for a weather variable. We use these scenarios to produce 51 scenarios for the weather-related component of electricity demand. The results show that the average of the demand scenarios is a more accurate demand forecast than that produced using traditional weather forecasts. We use the distribution of the demand scenarios to estimate the demand forecast uncertainty. This compares favourably with estimates produced using univariate volatility forecasting methods. 相似文献
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文章研究了联合计划、预测和补货(CPFR)中的联合预测流程,并建立了相关的预测模型。在建模的过程中,使用了状态空间方程来描述实际市场需求和观测到的市场需求(销售量),并通过卡尔曼滤波来预测零售商下期的销售量.结合零售商库存策略,预测出零售商下期的订单量。 相似文献
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Uriel Magaña Virginia L. M. Spiegler 《International Journal of Logistics Research and Applications》2017,20(4):359-380
Air transportation plays a crucial role in the agile and dynamic environment of contemporary supply chains. This industry is characterised by high air cargo demand uncertainty, making forecasting extremely challenging. An in-depth case study has been undertaken in order to explore and untangle the factors influencing demand forecasting and consequently to improve the operational performance of an air cargo handling company. It has been identified that in practice, the demand forecasting process does not provide the necessary level of accuracy, to effectively cope with the high demand uncertainty. This has a negative impact on a whole range of air cargo operations, but especially on the management of the workforce, which is the most expensive resource in the air cargo handling industry. Besides forecast inaccuracy, a range of additional hidden factors that affect operations management have been identified. A number of recommendations have been made to improve demand forecasting and workforce management. 相似文献
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《International Journal of Forecasting》2019,35(1):181-196
The classical spare part demand forecasting literature studies methods for forecasting intermittent demand. However, the majority of these methods do not consider the underlying demand-generating factors. The demand for spare parts originates from the replacement of parts in the installed base of machines, either preventively or upon breakdown of the part. This information from service operations, which we refer to as installed base information, can be used to forecast the future demand for spare parts. This paper reviews the literature on the use of such installed base information for spare part demand forecasting in order to asses (1) what type of installed base information can be useful; (2) how this information can be used to derive forecasts; (3) the value of using installed base information to improve forecasting; and (4) the limits of the existing methods. This serves as motivation for future research. 相似文献