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The composition of a product can be represented using a directed acyclic graph, called ''real structure'', in which every node is an aggregation of its children nodes: * The end nodes are individual components * The intermediate nodes are partial assemblies * The root node is the final product The graph arcs show the quantities of child components required to create a single instance of the parent, whether the parent is a partial assembly or the final product. The graph representation can be more useful than a tree representation in cases where the same component type is used repeatedly in building different assemblies. This graph type can also be applied to a production process, in which case it is known as an ''ideal structure'' graph, in which each node represents a process step: * The leaves of the graph correspond to a single step of the production process * The intermediate nodes represent a macro phase or a next step * The root of the graph represents the entire process. It is possible to create a single structure that contains both the ideal (production steps), and the real one (components, assemblies), called ''technological structure'': to the nodes of the ideal structure, known as ''ideal''nodes, there are links to the nodes of the real structure, called ''real nodes'', used in the production step mapped by the ideal node. If the considered ideal node is a leaf of the ideal structure, it is linked to the entire real subgraph that expresses the composition of the real node used in its production step; otherwise it binds only the single real node used, while his components are linked to the ideal nodes of the subgraph which describes the production steps. On the arcs of the graph that connect a real node to an ideal node is indicated the quantity of the real node used in the ideal node mapped production step. == Use of characteristics to configurate the Bill Of Material (BOM) Structure == The product variations can be expressed using ''characteristics'' (or ''features''): every product variation is defined by a combination of these characteristic values. If the considered product can have several variations, it can be too expensive to define each one of these with a different BOM structure. Using the technological structure and the characteristics, it is possible to define all the product variations in a single BOM structure simultaneously. It is sufficient to assign to the link between a real node and an ideal node, a characteristics based boolean function, which we shall term the ''application function''. The value of this function will be true only when the combination of the characteristic values corresponds to a product variation where the real node is used effectively. 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Bill of material based on characteristics」の詳細全文を読む スポンサード リンク
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