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Research on Educational Resources Grid-Based Trust Mechanism

Author: MouXiaoYan
Tutor: ShiLei
School: Shandong Normal University
Course: Applied Computer Technology
Keywords: Education resource grid Trusted domain Fuzzy Logic
CLC: TP393.08
Type: Master's thesis
Year: 2011
Downloads: 21
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Abstract

Educational resources construction is an important guarantee of the rapid development of information technology in education, but the ensuing explosion in the number of educational resources, the formation of islands of information, resulting in redundant construction of educational resources, to ensure the sharing of educational resources in order to avoid educational resources, education The resource grid came into being, and security is the most important education resource grid study. Trust model in a long time, has become the core elements of grid security, trust mechanism better respond to the heterogeneous, dynamic, autonomous characteristics of grid environment, and more effective than traditional security mechanisms to solve the grid security risks. Educational resources grid is a special form of the grid, the grid characteristics and their own characteristics, this paper, on the basis of improved grid trust model based on trust domains, combined with the characteristics of the educational resources grid in education The resource grid introduction of trust model to construct educational resource grid trust model. The main work of this paper made: (1) several classic data grid model and educational resources grid, according to the real social hierarchy of educational resources, to construct a multi-level domain-based educational resources grid model. This model uses a tree structure level domain specific divided into multi-layer domain structure, the use of distributed architecture with centralized structure of the two tectonic model, the advantages of of comprehensive centralized storage and distributed storage. (2) based on subjective logic, trusted domains, fuzzy logic trust model three main trust model based on this chapter, an improved hierarchical trust model based on trust domain, which focused on the idea of ??three models , extensions, improved the traditional trust model, the structure of the model based on the trusted domain model based on maintenance of the three trust relationship table: inter-domain trust relationships table, trust in the domain trust relationship tables, node trust relationship table model The relationship between a combination of subjective logic and fuzzy logic thinking, divided into direct relationship of trust and indirect trust relationships. Model educational node by geographical trusted domain, school campus or library branch to vesting headquarters to solve the traditional trust model based on trust domain in the trust domain node redundant construction. The model is set to a triple of elements in the group were a collection of node or collection of domain trust relationship evaluation model set of correction factors. Model authentication mechanisms, discusses in detail the transaction process node grid trust model of educational resources. (3) to establish a trust value maintenance mechanism, and build trust time decay function and malicious node punishment mechanism, the introduction of a large number of model correction factor to improve the educational resources grid trust model performance, using the formula discussed in detail between the nodes in the model, between domains of trust between the domain and the node value is calculated. Model to calculate the trust value contains the node of reward and punishment mechanism, taking into account a number of factors: the relationship of trust evaluation, trust threshold decay function; complex indirect trust value will simplify the recommended route, while the introduction of the trust factor distinguish Recommended node and the destination node trust affinities. (4) The simulation results show that, compared with the traditional educational resources of the trust mechanism mesh model, the model in anti-malicious nodes attack showed better performance, the accuracy of the trust value assessment is more stable, can effectively improve the education The resource grid nodes transaction success rate.

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