Research On Technologies Of Trust Management In Manufacturing Grid

As the application of Grid on Manufacture, Manufacturing Grid(MG) not only inherit the characteristics of dynamics,openness,autonomy and distributivity of Grid,but also has many other characteristics such as multi-subjects, cooperativity, sharing and flexibility, these characteristics determine that MG has higher security request than other Grid platform on security management.It helps to enhance the security level of resource sharing and collaborative manufacture by introducing trust management techniques into MG on security management.Depending on the mature trust management techniques theory of Grid technology and According to the characteristics of sharing and cooperativity of MG, this thesis focuses on studying the trust management technique of MG The main works is given as follow:(1) By analyzing the development of MG and trust management techniques in the related areas of domestic and abroad,this paper point out the disadvantages of the present research results.(2)On the basis of analyzing the demand of trust management techniques, this paper modifies the current trust management models and proposes a Dual-trust-Based Trust Manegement Model of MG. According to domain theory, the model divides the value of turst into resource-using value and resource-serving value. It resolves the problem that the malieious node offers single resource service all the time to increase its trust value, then makes a request of resource usage when its trust value is high enough and starts to implement malieious behavior.(3)Based on building the index of trust evaluation according to the differences between the resource-using value and resource-serving value, this paper provides a method which will make the direct trust evaluation become more reasonable. searching for suitable attenuation function to reflect the effect of time factors on the trust value by improving the present trust evaluationt strategy. Choosing the reasonable weight for recommend trust value,and selecting the proper weight parameters for the recommend trust value and direct trust value in the comprehensive trust values,moreover, introducing the risk mechanism to Reduce the negative influence of the malieious node.(4) The experimental analysis and performance comparison have been done to the model and approaches in this paper, the results of experiments show that the trust model in this paper is basically reasonable. It can restrained the malieious nodes’ behavior, and improve the successful ratio of resources cooperation in MGThe scientific significance of studies in this paper is to offer a new idea about trust evaluation and to provide reference opinions on improving the ability about safety and safeguard in MGThe study results make up some deficiency about the technologes of trust management in MG that has some academic values.