Safety assessment is one of important aspects in health management.In safety assessment for practical systems,three problems exist:lack of observation information,high system complexity and environment interference.Be...Safety assessment is one of important aspects in health management.In safety assessment for practical systems,three problems exist:lack of observation information,high system complexity and environment interference.Belief rule base with attribute reliability(BRB-r)is an expert system that provides a useful way for dealing with these three problems.In BRB-r,once the input information is unreliable,the reliability of belief rule is influenced,which further influences the accuracy of its output belief degree.On the other hand,when many system characteristics exist,the belief rule combination will explode in BRB-r,and the BRB-r based safety assessment model becomes too complicated to be applied.Thus,in this paper,to balance the complexity and accuracy of the safety assessment model,a new safety assessment model based on BRB-r with considering belief rule reliability is developed for the first time.In the developed model,a new calculation method of the belief rule reliability is proposed with considering both attribute reliability and global ignorance.Moreover,to reduce the influence of uncertainty of expert knowledge,an optimization model for the developed safety assessment model is constructed.A case study of safety assessment of liquefied natural gas(LNG)storage tank is conducted to illustrate the effectiveness of the new developed model.展开更多
针对Liu等(LIU J,MARTINEZ L,CALZADA A,et al.A novel belief rule base representation,generation and its inference methodology.Knowledge-Based Systems,2013,53:129-141)提出的扩展置信规则库(BRB)推理精度不够高的问题,提出了...针对Liu等(LIU J,MARTINEZ L,CALZADA A,et al.A novel belief rule base representation,generation and its inference methodology.Knowledge-Based Systems,2013,53:129-141)提出的扩展置信规则库(BRB)推理精度不够高的问题,提出了一种改进的规则库构建与推理方法。在Liu等提出的规则库构建方法的基础上,给出了一种新的生成规则前件与计算规则权重的方法;同时为了避免大量不必要的规则被激活,引入80/20法则改进规则激活策略,并最终形成完整的置信规则库构建与推理方法。通过输油管道检漏的实例对所提方法的准确性和效率进行对比分析。实验结果表明,所提方法能够在保证低耗时的同时,将系统平均绝对误差(MAE)降低到0.17342,具有较高的效率和精度。展开更多
To address the issue of rule premise combination explosion in the construction of the traditional complete conjunctive belief rule base(BRB),this paper introduces an orthogonal design method to reduce the conjunctive ...To address the issue of rule premise combination explosion in the construction of the traditional complete conjunctive belief rule base(BRB),this paper introduces an orthogonal design method to reduce the conjunctive BRB.The reasoning method based on reduced conjunctive BRB is designed with the help of the conversion technology from conjunctive BRB to disjunctive BRB.Finally,the operational mission effectiveness evaluation is taken as an example to verify the proposed method.The results show that the method proposed in this paper is feasible and effective.展开更多
基金supported in part by the National Natural Science Foundation of China(61833016,61751304,61873273,61702142,61773388)the Key Research and Development Plan of Hainan(ZDYF2019007)Shaanxi Outstanding Youth Science Foundation(2020JC-34)。
文摘Safety assessment is one of important aspects in health management.In safety assessment for practical systems,three problems exist:lack of observation information,high system complexity and environment interference.Belief rule base with attribute reliability(BRB-r)is an expert system that provides a useful way for dealing with these three problems.In BRB-r,once the input information is unreliable,the reliability of belief rule is influenced,which further influences the accuracy of its output belief degree.On the other hand,when many system characteristics exist,the belief rule combination will explode in BRB-r,and the BRB-r based safety assessment model becomes too complicated to be applied.Thus,in this paper,to balance the complexity and accuracy of the safety assessment model,a new safety assessment model based on BRB-r with considering belief rule reliability is developed for the first time.In the developed model,a new calculation method of the belief rule reliability is proposed with considering both attribute reliability and global ignorance.Moreover,to reduce the influence of uncertainty of expert knowledge,an optimization model for the developed safety assessment model is constructed.A case study of safety assessment of liquefied natural gas(LNG)storage tank is conducted to illustrate the effectiveness of the new developed model.
文摘针对Liu等(LIU J,MARTINEZ L,CALZADA A,et al.A novel belief rule base representation,generation and its inference methodology.Knowledge-Based Systems,2013,53:129-141)提出的扩展置信规则库(BRB)推理精度不够高的问题,提出了一种改进的规则库构建与推理方法。在Liu等提出的规则库构建方法的基础上,给出了一种新的生成规则前件与计算规则权重的方法;同时为了避免大量不必要的规则被激活,引入80/20法则改进规则激活策略,并最终形成完整的置信规则库构建与推理方法。通过输油管道检漏的实例对所提方法的准确性和效率进行对比分析。实验结果表明,所提方法能够在保证低耗时的同时,将系统平均绝对误差(MAE)降低到0.17342,具有较高的效率和精度。
基金supported by the Military Scientific Research Program(41401020301).
文摘To address the issue of rule premise combination explosion in the construction of the traditional complete conjunctive belief rule base(BRB),this paper introduces an orthogonal design method to reduce the conjunctive BRB.The reasoning method based on reduced conjunctive BRB is designed with the help of the conversion technology from conjunctive BRB to disjunctive BRB.Finally,the operational mission effectiveness evaluation is taken as an example to verify the proposed method.The results show that the method proposed in this paper is feasible and effective.
