[库存系统.pptVIP

订购时机 订购时机或订购时点的决定有两类型的模式： 时间基准法则(time-based)如固定订购周期模式，例如系统设定在每周三发出订单补货为本类型的模式； 再订购点模式(Re-Order Point－ROP)，当存货水平等于或小于再订购点时，则发出订单补货。 由于固定订购周期模式比较不涉及数学决策问题，因此系统的参数设定也相对的简单，本节所讨论将以再订购点模式为主。 需求不确定(Uncertainty)或前置时间不为零或前置时间不确定时，则产生订购时机或再订购点如何决定的问题，当然也是ERP系统参数如何设定的问题。订购时机的决定与前述的经济订购批量的基本原则类似，但须多考虑服务水平的因素：在满足设定的服务水平前提下，使总存货成本最小化。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 订购时机 LT Time Expected demand during lead time Maximum probable demand during lead time ROP Quantity Safety stock Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 安全库存 所谓的安全库存(Safety Stock)是为了因应前置时间的需求不确定，或因前置时间的不确定性所产生的总需求变异，所保存的超额库存，以降低存货短缺的机率，维持一定的服务水平。因此安全存量的决定需考虑三项因素： 服务水平的高低 前置时间变异性的大小 需求率变异性的大小 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 仓储作业 收料作业 发料作业 库存记录 呆废料处理作业及其他管理事项 物料盘点作业 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 物流链(Logistic Chain of SAP R/3) Vendor Requisition / planned order Goods Receipt Customer Order MRP Billing Delivery Goods Issue Picking Quotation Customer Procurement Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 企业资源规划 库存管理系统 陈振明 中央大学工管所教授 Evaluation on