基于网格社区的教育资源管理研究

发布时间：2018-07-27 11:19

【摘要】： 教育资源建设是信息化教学的基础,随着教育信息化的深层次推进,教育资源建设在教育信息化建设中的地位已显得十分重要。但是当前的教育资源建设中普遍存在一些问题:资源存储分散,缺乏广泛的合作;标准不完善,网络的异构;不能大范围共享、利用率不高、重复开发现象严重等。其中主要的问题还是没有形成资源的有效共享。网格是伴随着互联网而迅速发展起来的,是构筑在因特网上的一种新的基础设施和新技术。2001年,美国Argonne实验室的Ian Foster博士等指出:网格关心的是在动态的、多机构的虚拟组织中协调资源共享和协同解决问题,核心思想是在一组参与节点(资源提供者和消费者)中协商资源共享管理的能力,利用协商得到的资源池共同解决一些问题。因特网技术实现了计算机之间的信息交换,网格试图在互联网上实现异构资源的全面的受控的共享,将整个因特网整合成一台巨大的超级计算机与巨型资源池。网格具有虚拟性、共享性、集成性和协商性等优势。网格根本目的在于消除资源孤岛,实现资源的高度共享,使网络上的资源得以充分得利用。将网格技术应用于教育资源管理中,将会最大限度地整合现有的教育资源,应用分布式管理思想,对教育资源进行有效的管理,改变目前教育资源管理无序的现状。通过构建一体化的教育智能信息处理平台,消除信息孤岛和资源孤岛,方便教学信息的发布、处理与获取,实现教学资源的共享。论文在分析已有的研究成果基础之上,对网格环境下教育资源的元数据标准、表现与存储形式进行了研究,探讨了网格环境下教育资源社区模型的构建、社区之间的信息共享与消息扩散、基于社区的小世界模型、社区资源发现等问题。本论文的工作主要包括下面几个方面: (1)通过对目前一些教育资源的元数据标准进行分析,探讨了基于学习对象的元数据标准LOM(Learning Object Metadata)作为网格环境下教育资源描述实现的标准。结合网格资源RDF(Resource Description Framework)形式实现了基于RDF和LOM的捆绑,建立了基于LOM的RDF模型,为网格环境下教育资源的统一描述提供了一个参考范例。 (2)以LOM中的资源分类标准作为网格社区划分的依据,按照教育资源分类的原则,并根据网格管理体系结构的特点,构建了基于教育资源的网格社区模型作为教育资源管理的框架。 (3)根据网格社区的特点,对网格社区的构建、社区的内部结构进行了探讨,并根据网格中资源分布的特点,提出了构建对等网格社区群的理念。对同类教育资源按照对等社区的理念,通过索引层,使得对等社区之间实现了逻辑上的关联。在社区之间建立了信息共享和消息扩散机制,编写了相应的算法,并对结果进行了仿真与评价。 (4)根据网格社区的特点,在分析研究网格资源发现的基础上,通过引入小世界的概念,分析网格社区中节点群体所具有的小世界特征,建立了基于网格社区的小世界资源查找模型。提出了基于小世界模型的网格社区中教育资源的动态发现策略,并编写了相应的算法,实现了基于社区动态环境下的教育资源快速、准确发现。对查找的链长进行了理论上的分析,并对算法的效果进行了仿真与评价。基于上述的研究,对基于网格社区中教育资源管理的研究进行了总结,并对今后的研究工作进行了展望。
[Abstract]:The construction of educational resources is the basis of information teaching. With the deep advancement of education informatization, the status of educational resources construction has become very important in the construction of education information. However, there are some problems in the current educational resources construction: the scattered resources, the lack of extensive cooperation, the imperfect standards and the isomerism of the network; It can be shared in a wide range, with low utilization rate and serious redevelopment. The main problem is that there is no effective sharing of resources.
The grid is developed rapidly with the Internet, a new infrastructure and new technology built on the Internet,.2001, the Ian Foster of the Argonne laboratory in the United States points out that the grid is concerned with sharing resources and solving problems in a dynamic, multi organization virtual organization. The core idea is in a group. The ability to negotiate resources sharing management in the node (resource provider and consumer) and to solve some problems by using the pool of negotiated resources. Internet technology realizes information exchange between computers. The grid tries to realize comprehensive and controlled sharing of heterogeneous resources on the Internet, and integrate the whole Internet into a giant. Large supercomputers and giant resource pools. The grid has the advantages of virtuality, sharing, integration and negotiation. The fundamental purpose of the grid is to eliminate the island of resources, to realize the high sharing of resources, and to make full use of the resources on the network.
The application of grid technology to the management of educational resources will integrate the existing educational resources to the maximum, apply the thought of distributed management, manage the educational resources effectively, change the current situation of the disorder of educational resources management, and eliminate the information island and the resource island by constructing an integrated educational intelligence information processing platform. Then the release, processing and acquisition of teaching information, so as to achieve the sharing of teaching resources.
Based on the analysis of the existing research results, this paper studies the metadata standards, performance and storage forms of educational resources in the grid environment, and discusses the construction of the community model of educational resources under the grid environment, the information sharing and information diffusion among communities, the small world model based on the community area, the discovery of community resources and so on. The work of this paper mainly includes the following aspects:
(1) through the analysis of the metadata standards of some current educational resources, the standard of the metadata standard LOM (Learning Object Metadata) based on the learning object is discussed as the standard for the realization of the education resource description under the grid environment. The binding of RDF and LOM based on the RDF (Resource Description Framework) form of grid resources is established. The RDF model based on LOM provides a reference example for the unified description of educational resources in the grid environment.
(2) taking the resource classification standard in LOM as the basis of grid community division, according to the principle of educational resources classification, and according to the characteristics of grid management system structure, a grid community model based on educational resources is constructed as the framework of educational resource management.
(3) according to the characteristics of the grid community, the construction of the grid community and the internal structure of the community are discussed. According to the characteristics of the distribution of resources in the grid, the concept of building a peer to peer community group is put forward. The same kind of educational resources, according to the concept of the peer community, through the index layer, makes the logical correlation between the peer communities. The mechanism of information sharing and message diffusion is established among communities, and the corresponding algorithm is compiled, and the results are simulated and evaluated.
(4) according to the characteristics of grid community, based on the analysis of the discovery of grid resources, by introducing the concept of small world, the small world characteristics of the node groups in the grid community are analyzed, and a small world resource lookup model based on the grid community is established. The dynamic development of educational resources in the grid community based on the small world model is proposed. The strategy is presented and the corresponding algorithm is written to realize the rapid and accurate discovery of educational resources based on the dynamic environment of the community. The chain length of the search is analyzed in theory, and the effect of the algorithm is simulated and evaluated.
Based on the above research, the research of educational resource management based on grid community is summarized, and the future research work is prospected.
【学位授予单位】：西南大学
【学位级别】：博士
【学位授予年份】：2008
【分类号】：G434

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