基于本体的学习对象共享性研究

发布时间：2018-03-19 20:22

本文选题：本体　切入点：E-Learning　出处：《首都师范大学》2008年硕士论文　论文类型：学位论文

【摘要】： 随着互联网的迅速发展和全球对终身教育的需求,E-Learning正成为互联网上的一种重要应用。E-Learning的应用越来越广也使网上的学习资源日益丰富,但是目前E-Learning应用中还存在一些不足,例如学习资源不能够被有效地检索、资源的共享性差、资源重复建设及信息孤岛的存在等。学习资源的标准化建设和学习对象理念的提出在一定程度上促进了资源的共享,文章首先探讨了学习对象的概念及其发展历程,着重分析了学习对象的分类方法和国内外学习对象的组织建设现状。接着研究了学习对象的标准化,重点分析我国对学习对象相关标准的应用及主要不足。在以上研究的基础上提出资源共享性差这一问题的根本原因在于资源缺乏语义,以及共享机制弱。问题的解决要求网上资源在语义层次上采用明确、规范、一致的表达方式,因此元数据标准为统一资源的描述而被提出,学习对象也迈出了走向标准化的步伐。但学习资源标准有其局限性,它们过于着重对属性的规范说明,且不能描述学习材料的主观信息。本体作为一个概念模型,可以表达出一个领域中的基本知识体系,论文充分研究了语义网和本体的基本理论以及本体在网络资源应用中的必要性和可行性,进而提出使用本体来描述学习对象的语义,并将这一应用实现在语义网框架中,通过增强语义互操作能力来提高学习对象的共享水平。论文探讨了RDF、OIL和OWL等本体描述语言的语义表达能力,对比分析了多种本体创建工具,并采用OWL作为本体描述语言,用Protégé作为本体的开发工具建立了学习对象本体OntoLo。文中对本体中的概念集、关系集、属性集和实例作了讨论,为全面的实现共享提供了语义基础。最后提出了在语义Web环境下基于本体的学习对象的共享模式。
[Abstract]:With the rapid development of the Internet and the global demand for lifelong education, E-Learning is becoming an important application on the Internet. E-Learning is becoming more and more widely used and makes the learning resources on the Internet more and more abundant. However, there are still some shortcomings in E-Learning applications at present. For example, learning resources can not be effectively retrieved, resource sharing is poor, resources repeat construction and the existence of isolated information islands, and so on. The standardization of learning resources and the idea of learning objects promote the sharing of resources to a certain extent. This paper first discusses the concept of learning objects and their development process. The classification methods of learning objects and the present situation of the organization construction of learning objects at home and abroad are analyzed, and then the standardization of learning objects is studied. On the basis of the above research, it is pointed out that the fundamental reason for the poor resource sharing lies in the lack of semantics of resources and the weakness of sharing mechanism. Problem solving requires that online resources be expressed in a clear, standardized and consistent way at the semantic level, so the metadata standard is proposed to unify the description of resources. But the standards of learning resources have their limitations, they focus too much on the specification of attributes, and they can not describe the subjective information of learning materials. As a conceptual model, ontology can express the basic knowledge system in a field. The basic theory of semantic web and ontology and the necessity and feasibility of ontology in the application of network resources are fully studied in this paper. Furthermore, ontology is used to describe the semantics of learning objects, and the application is implemented in the framework of semantic web. This paper discusses the semantic expression ability of ontology description languages such as RDF oil and OWL, compares and analyzes several ontology creation tools, and uses OWL as ontology description language. In this paper, the concept set, relation set, attribute set and examples of ontology are discussed by using Prot 茅 g 茅 as an ontology development tool. It provides a semantic basis for the overall implementation of sharing. Finally, an ontology-based learning object sharing model is proposed in the semantic Web environment.
【学位授予单位】：首都师范大学
【学位级别】：硕士
【学位授予年份】：2008
【分类号】：G434

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