MRP里如何预测lead time :Approaches for the Prediction of Lead Times in an Engineer to Order Environment

本文是篇读论文笔记:Approaches for the Prediction of Lead Times in an Engineer to Order Environment—A Systematic Review

开始研究用机器学习技术解决一些工业生产(manufacture)里面关于MRP(material requirements planning)的一些问题。先侧重看一下关于lead time的预测,读一篇2020年发表于IEEE的关于leadtime预测研究方法综述的论文 [1]。 欢迎大家交流讨论和指导~

一些基本概念

  1. MRP(material requirement planning)
    工业生产是一个复杂的过程,拿生产汽车来说,要产品设计,预定各种材料、生产零部件,仓库存储,组合,测试,交付等等。这个过程需要生产和库存的管理,而MRP就是用来管理这些的一套理论方法或者软件工具。以下是Wikipedia的定义:

英文:Material Requirements Planning,是一种企业管理软件,实现对企业的库存和生产的有效管理。
MRP软件中,将企业生产过程中可能使用到的原料、半成品、产品等看作物料,并通过将物料按照结构和需求关系分解为物料清单(Bill of Material,BOM),根据物料清单计算各种原料的最迟需求时间和半成品的最迟生产时间

  1. Lead time
    是指从供应商接到订单,直到货物收到仓库的全部时间,包括了接收订单、处理订单、生产订单、运输订单,直到抵达客户仓

Polymorphism is a fundamental concept in object-oriented programming that allows objects of different classes to be treated as if they were objects of the same class. In Java, there are two common ways to implement polymorphism: Overloading and Overriding. 1. Overloading: This occurs when multiple methods have the same name but different parameters. The method that is called depends on the type and number of arguments passed to it. Overloading is a way to provide different implementations of the same method for different types of input. Example: ``` public class MathOperations { public int add(int a, int b) { return a + b; } public double add(double a, double b) { return a + b; } } ``` In the example above, there are two methods called `add`, but one takes two `int` parameters, and the other takes two `double` parameters. When the `add` method is called, the appropriate method is selected based on the parameters passed to it. 2. Overriding: This occurs when a subclass provides a specific implementation of a method that is already defined in its superclass. The subclass method must have the same name, return type, and parameters as the superclass method. The subclass method can also have a more specific access modifier than the superclass method. Example: ``` public class Shape { public void draw() { System.out.println("Drawing a shape."); } } public class Circle extends Shape { @Override public void draw() { System.out.println("Drawing a circle."); } } ``` In the example above, the `Circle` class overrides the `draw` method of its superclass `Shape`. When the `draw` method is called on a `Circle` object, the `Circle` implementation of the method is executed instead of the `Shape` implementation.
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