面向应用领域的知识系统建模及实现

针对知识系统建模过程中不同类型知识的组织、表示、控制和实现等问题,将用户需求作为重要的切入点,通过对用户的需求分析和分解将知识系统数据结构划分为领域概念知识(概念本体)、领域系统知识(方法本体)、需求分解知识(需求本体)、知识系统控制知识和解释知识5大部分,建立了各部分的数据结构,明确了相互之间的关系。提出了基于层次案例规划(hierarchicalcase basedplanning,HCBP)的需求本体建立检索及面向目标的黑板控制结构和改进算法。实例测试表明,该方法不仅有利于不同类型知识块的重用,而且提高了系统的执行效率,大大缩短了知识系统的开发周期。

Modelling and realization of the knowledge based system in application areas

To express, organize, and realize different kinds of knowledge in knowledge based system modelling, a knowledge based system modelling approach is presented through analyzing and decomposing customer's requirements. The key elements of the knowledge based system are divided into requirement ontology, conception ontology, method ontology, control knowledge and explanatory knowledge, which respectively correspond to customer's view, domain conception view, system resolving approach view, system structure view and system resolving track view. The data structures and the relationship of these elements are defined. A hierarchical system planning scheme is put forward based on hierarchical case-based planning (HCBP) for the requirement decomposition of complicated knowledge based system. The system control framework is introduced, in which the goal-oriented blackboard control model provides the backbone. The structure and improved arithmetic of the goal-oriented blackboard control model based on HCBP are described. The test result shows that this approach is advantageous to the reuse of the basic knowledge chunks. The development period can be shortened largely and the knowledge based system is efficient in this frame.