由於知識管理時代來臨，本體論(ontology)的盛行，針對不同領域皆有其專屬本體論，以幫助使用者去互相分享和共同理解該領域知識，然而現今一般在建立本體論時，仍主要在於將知識中不同的概念抽取出來建成物件，並定義物件內的屬性，透過屬性來間接定義概念之間關係，卻很少直接將不同概念(classes)間或是不同案例(instances)間關係，甚而不同本體論間關係明確定義出來，因此，在本研究中，將利用修正式德爾菲法直接把不同知識項目間的關係運算子定義出來，去連結之間的關係，並假設管理層面下應具有不同階層關係的本體論，不同階層本體論中會具有不同關係運算子，階層較高本體論的關係運算子在階層較低的本體論中亦可使用。本研究以最基本單元-管理層面本體論中生產管理內的主生產排程規劃領域，以修正式德爾菲法探討其本體論中不同項目間關係運算子。透過關係運算子的建立可增進本體論的完整性及整合性，來幫助未來此領域專家可建立更完善的本體論，並讓此本體論的使用者可快速了解此領域知識，此本體論的管理者未來可更方便維護。
本研究在實作方面，將透過ontology建立工具:Protégé 3.1.1，以Java為程式語言開發工具，撰寫其關係運算子外掛模組，使知識工程師在建立主生產排程規劃領域本體論時，可利用此模組去建立不同概念或不同案例間關係，並可讓使用者透過此模組，直接對這些關係更了解，最後從建立、測試與實際執行系統的過程，對本研究做出結論，並對未來可延伸或是改進地方提出建議。

Different ontologies are specifically applicable to different domains in order to help the users to share their domain knowledge as the knowledge management is blooming in these days. However, most researchers usually create classes for the concepts of the domain, define the properties of the classes, and set the relations among concepts indirectly via these properties when developing their ontology. They seldom define the relations directly among classes, instances, and ontologies.
In this research, we apply Modified Delphi Method to define the relational operators among knowledge items directly. These relational operators, on one hand, will link the relationship among knowledge items. And the relational operators, on the other hand, provide the foundation of management ontology. We assume that there exists different ontology under different management levels. And different relational operators are needed for different ontologies in each management levels. Thus, the relational operators of high level ontology can be used in lower level ontology. The Master Production Schedule Planning is used as the production management domain to develop the relational operators of the ontology. These relational operators can improve the integration of ontology, help the domain experts to build more complete ontology, and make the users understand the domain knowledge more quickly.
Specifically, we use Protégé 3.1.1 as an ontology-developing environment and Java is used as a program-developing tool to implement the relational operator plug-in for protégé. When the knowledge engineers develop Master Production Schedule Planning ontology, they can use the plug-in to implement relations among concepts or instances. And users can understand these relations thoroughly.

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