Research On Evaluation System Of Decentralized System RDF Data Quality

With the development of semantic web,the application fields of RDF data sets are more and more widely.The RDF data quality relates to whether an RDF data set can provide better service.Therefore,the quality evaluation of RDF datasets has become one of the hot topics.As the Semantic Web is gradually maturing,the decentralized system is also rapidly evolving,especially in blockchain research.There are more and more applications that use RDF data sets in decentralized systems.Each node in the system has its own RDF data set.Different node's data is independent of each other while each RDF data set may have the same entity or attribute.Most of the current research on RDF data set quality evaluation is for a single data set.Therefore,this thesis deeply discusses the method and significance of evaluating quality in the decentralized system.The main work of this thesis is divided into two parts.At first,through mathematical modeling methods,we propose the quality evaluation model of nodes and the quality evaluation model of RDF datasets in nodes;Secondly,use blockchain to store quality evaluation results which make quality evaluation traceable and not arbitrary modification,real-time and other features.First of all,in the discussion of the quality evaluation model,the methods for calculating the credibility and other dimensions have changed,and new quality evaluation dimensions such as integrity and monopoly have emerged.This thesis describes and gives the quantification and implementation of these dimensions.Secondly,this thesis innovatively uses blockchain technology to store RDF dataset quality evaluation results.The advantages are as follows:(1)No authoritative center issues quality assessment certificates;(2)Prevents nodes from tampering with quality assessment results;(3)Supports quality results Update mechanism.The experimental results show that the decentralized RDF quality assessment system can not only ensure that the RDF quality is certified,but also provide references for inquiries or other operations.