面向危险化学品事故的事理图谱构建

Development of causal graph for hazardous chemical accidents

为提高危险化学品企业安全管理水平,构建危险化学品事故因果关系事理图谱。首先,依据事故调查报告,提出一种基于改进CasRel的实体关系联合抽取模型,该模型通过关系感知双向编码器表征法(R-Bert)和Span指针网络提高文本信息的抽取准确性;其次,利用相似度计算方法进行事件泛化,使得图谱更加完整和准确,并将其存储在图数据库Neo4j中,以可视化的方式直观展示事件之间的关联;最后,基于构建的事理图谱,设计出与之匹配的问答系统架构,开发危险化学品事故因果关系智能问答系统。研究结果表明:改进的CasRel模型计算结果F_(1)值为90.5%,较未改进模型准确率提升约2%。构建的危险化学品事故事理图谱及智能问答系统,在多个评价指标表现良好,能够清晰揭示事件之间的逻辑关系;所提方法可满足危险化学品事故知识问答需求,协助探究事故发生的规律和潜在风险因素,推断事故发展趋势。

The causality causal graph of hazardous chemical accidents was developed to improve the safety management level of hazardous chemical enterprises.Firstly,based on the accident investigation report,an entity-relationship joint extraction model was proposed through an improved CasRel technique.Furthermore,the proposed model aimed to improve the extraction accuracy of textual information by incorporating the relationship-aware bidirectional encoder representation method(R-Bert)and Span pointer network.Subsequently,similarity calculation methods were used to generalize the events to enhance the graph's comprehensiveness and accuracy.Then,the refined data was stored in the Neo4j graph database visualizing the associations between events.Finally,the corresponding guestion-answering system was proposed based on the developed causal graph,and then an intelligent question-answering system for the causality of hazardous chemical accidents was proposed.The results indicated that the F 1 value calculated by the improved CasRel model was 90.5%,and the prediction accuracy of the proposed model was 2%higher than that simulated by the original model.The hazardous chemical accidents causal graph and intelligent question-answering system performed well in terms of multiple evaluation indexes,clearly revealing the logical relationship between events.Therefore,the proposed model in this study can meet question-answering needs of hazardous chemical accidents,facilitating the exploration of accident patterns and potential risk factors,and enabling accident trend prediction.