网格环境下教育资源发现的研究

发布时间：2018-05-13 22:34

本文选题：网格 + 教育资源　；参考：《重庆师范大学》2008年硕士论文

【摘要】： 21世纪是人类全面进入信息化社会的伟大时代,教育信息化、数字化建设也在不断深入,各类教育资源将会越来越多,并呈指数级增长。但是当前的教育资源建设普遍存在如下一些问题:优质资源较少,存储分散,缺乏广泛的资源合作;远程教育标准不完善,网络存在大量的异构结构;教育资源不能大范围内共享,利用率不高,重复开发现象严重;资源检索的技术智能化水平不高;资源的获取和应用及更新速度慢,动态适应性较差等。其中主要问题还是没有形成资源的有效共享。网格技术的出现,使资源的完全共享有了实现的可能,因为网格的本质就是资源的全面共享。网格具有在教育领域有广泛应用价值的特性:共享性、动态性、异构性、超级计算性能、强大的服务支持等。网格技术革新了传统资源共享的弊端,使教育资源能够全面共享,异构系统互操作再无障碍,网格创新了“服务”的概念,对学习者提供按需服务。教育资源的注册和发现是教育资源有效共享的核心和基础。只有在资源注册和发现的基础上,其他应用才可能实现。本文首先简述了网格技术的定义及特点,分别论述了三种流行的资源元数据描述标准,并提出了一种改进的教育资源的元数据描述。在已有发现机制的基础上,提出了一种基于层次的教育资源分类注册与发现方法。最后给出了教育资源注册及发现算法,并使用GridSim进行了仿真测试。
[Abstract]:The 21st century is a great time for mankind to enter the information society in an all-round way. The construction of educational informatization and digitization is also deepening continuously. All kinds of educational resources will be more and more, and will increase exponentially. However, the current construction of educational resources has the following problems: less high-quality resources, scattered storage, lack of extensive cooperation of resources, imperfect standards of distance education, and a large number of heterogeneous structures in the network; The educational resources can not be shared in a large scale, the utilization rate is not high, the phenomenon of repeated exploitation is serious, the technology intelligence level of resource retrieval is not high, the acquisition, application and renewal of resources are slow, the dynamic adaptability is poor, etc. The main problem is that there is no effective sharing of resources. With the emergence of grid technology, it is possible to share resources completely, because the essence of grid is the overall sharing of resources. Grid has the characteristics of widely applied value in the field of education: sharing, dynamic, heterogeneous, super computing performance, powerful service support and so on. Grid technology has revolutionized the disadvantages of traditional resource sharing, which makes educational resources fully shared, and the heterogeneous systems can operate again without hindrance. Grid innovates the concept of "service" and provides on-demand service to learners. The registration and discovery of educational resources is the core and foundation of effective sharing of educational resources. Other applications can only be implemented on the basis of resource registration and discovery. In this paper, the definition and characteristics of grid technology are briefly introduced, three popular standards of resource metadata description are discussed, and an improved metadata description of educational resources is proposed. Based on the existing discovery mechanism, a hierarchical method for the classification registration and discovery of educational resources is proposed. Finally, the algorithm of educational resource registration and discovery is given, and the simulation test is carried out with GridSim.
【学位授予单位】：重庆师范大学
【学位级别】：硕士
【学位授予年份】：2008
【分类号】：G434

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