Intuitionistic trapezoidal fuzzy numbers and their operational laws are defined. Based on these operational laws, some aggregation operators, including intuitionistic trapezoidal fuzzy weighted arithmetic averaging op...Intuitionistic trapezoidal fuzzy numbers and their operational laws are defined. Based on these operational laws, some aggregation operators, including intuitionistic trapezoidal fuzzy weighted arithmetic averaging operator and weighted geometric averaging operator are proposed. Expected values, score function, and accuracy function of intuitionitsic trapezoidal fuzzy numbers are defined. Based on these, a kind of intuitionistic trapezoidal fuzzy multi-criteria decision making method is proposed. By using these aggregation operators, criteria values are aggregated and integrated intuitionistic trapezoidal fuzzy numbers of alternatives are attained. By comparing score function and accuracy function values of integrated fuzzy numbers, a ranking of the whole alternative set can be attained. An example is given to show the feasibility and availability of the method.展开更多
The power transformer is the key equipment of transforming voltage and exchanging power in the power system.It's safe and reliable operation directly influences the safe level of the power system.To study the risk...The power transformer is the key equipment of transforming voltage and exchanging power in the power system.It's safe and reliable operation directly influences the safe level of the power system.To study the risk assessment of power transformer which is very significant to improve the reliability of the power system,a fuzzy comprehensive risk assessment model of power transformer based on Borda number theory is proposed in this paper.At first,the fault types and risk factors of the power transformer are analyzed.Secondly,the basic framework of the fuzzy comprehensive evaluation is applied to quantify the risk factors.And then,Borda number theory is employed to analyze influence degree and occurrence probability of power transformer.At last,the various risk factors impact index and fuzzy comprehensive evaluation index of power transformer can be easily obtained.Applying this model,the relative importance degree of the risk factors can be horizontally compared according to the numerical index,the engineering staff can directly get the parameters of the transformer risk level and get a good description of the visual expression through using 5 score and similar visual language.展开更多
The class of multiple attribute decision making （MADM） problems is studied, where the attribute values are intuitionistic fuzzy numbers, and the information about attribute weights is completely unknown. A score fun...The class of multiple attribute decision making （MADM） problems is studied, where the attribute values are intuitionistic fuzzy numbers, and the information about attribute weights is completely unknown. A score function is first used to calculate the score of each attribute value and a score matrix is constructed, and then it is transformed into a normalized score matrix. Based on the normalized score matrix, an entropy-based procedure is proposed to derive attribute weights. Furthermore, the additive weighted averaging operator is utilized to fuse all the normalized scores into the overall scores of alternatives, by which the ranking of all the given alternatives is obtained. This paper is concluded by extending the above results to interval-valued intuitionistic fuzzy set theory, and an illustrative example is also provided.展开更多
针对风力发电机组频发的火灾事故,首先从人-机-环-管角度出发,通过统计分析近20年来全球81起风力发电机组火灾事故案例,得到了21项风力发电机组火灾事故的影响因素;然后通过事故树分析(fault tree analysis,FTA)法演绎推理得到了风力发...针对风力发电机组频发的火灾事故,首先从人-机-环-管角度出发,通过统计分析近20年来全球81起风力发电机组火灾事故案例,得到了21项风力发电机组火灾事故的影响因素;然后通过事故树分析(fault tree analysis,FTA)法演绎推理得到了风力发电机组火灾事故各基本事件的逻辑关系,并根据结构重要度进行了火灾事故致因的定性分析;接着采用模糊层次分析(fuzzy analytic hierarchy process,FAHP)法,将事故树的基本事件从人、机、环、管4个方面整合,构建出风力发电机组火灾事故致因评价指标体系,并以结构重要度系数的顺序为模糊判断矩阵的赋值依据,进行了火灾事故致因的定量分析;最后,根据综合分析结果提出了风力发电机组火灾事故的对策措施。结果表明:机和环境的不安全因素是引发火灾事故的主要致因;电气设备故障和雷击是最主要因素。该研究成果可为风力发电机组的火灾防治提供理论参考。展开更多
自顶向下的模糊模式树(pattern tree top-down,PTTD)是一种基于相似性度量的模式树归纳方法,在构建过程中采用集束搜索策略,以贪婪方式搜索候选树空间,导致模型构建时间较长。为了解决这一问题,提出一种基于模糊规则插值技术的PTTD优化...自顶向下的模糊模式树(pattern tree top-down,PTTD)是一种基于相似性度量的模式树归纳方法,在构建过程中采用集束搜索策略,以贪婪方式搜索候选树空间,导致模型构建时间较长。为了解决这一问题,提出一种基于模糊规则插值技术的PTTD优化方法(PTTD-FRI)。首先,设计了一种新的搜索优化策略,简化了模型构建的搜索空间,构造稀疏规则库;然后,提出了一种模糊模式树规则转换方法,将复杂的模糊模式树拆分为多条仅包含三角范数的模糊规则,并用三角余范数聚合;最后,引入模糊规则插值模块,通过简单的计算,进一步完善规则库,提升分类性能。实验结果表明,PTTD-FRI在保持相近分类准确率的情况下,有效提升了模型训练效率,降低了模型复杂度。展开更多
为有效评估和降低海上平台穿刺风险,提出一种基于事故树分析(fault tree analysis,FTA)和贝叶斯网络(Bayesian network,BN)的混合风险识别模型。根据相关事故报告和现有文献,构建海上平台穿刺事故的事故树模型。结合模糊集理论和事故树...为有效评估和降低海上平台穿刺风险,提出一种基于事故树分析(fault tree analysis,FTA)和贝叶斯网络(Bayesian network,BN)的混合风险识别模型。根据相关事故报告和现有文献,构建海上平台穿刺事故的事故树模型。结合模糊集理论和事故树模型计算基本事件的概率,并根据映射规则将事故树模型转换为BN模型。通过BN模型的诊断推理和敏感性分析识别海上平台穿刺事故的关键影响因素。结果表明:导致海上平台穿刺事故的关键影响因素为安全培训不足、人员应急经验不足、应急预案不完善、管理者决策失误以及穿刺发生突然且剧烈。该模型可以有效评估海上平台穿刺风险,并为制定有针对性的风险防控措施提供科学依据。展开更多
基金supported by the National Natural Science Foundation of China (70771115).
文摘Intuitionistic trapezoidal fuzzy numbers and their operational laws are defined. Based on these operational laws, some aggregation operators, including intuitionistic trapezoidal fuzzy weighted arithmetic averaging operator and weighted geometric averaging operator are proposed. Expected values, score function, and accuracy function of intuitionitsic trapezoidal fuzzy numbers are defined. Based on these, a kind of intuitionistic trapezoidal fuzzy multi-criteria decision making method is proposed. By using these aggregation operators, criteria values are aggregated and integrated intuitionistic trapezoidal fuzzy numbers of alternatives are attained. By comparing score function and accuracy function values of integrated fuzzy numbers, a ranking of the whole alternative set can be attained. An example is given to show the feasibility and availability of the method.
基金Project Supported by National Natural Science Foundation of China （50425722）, Natural Science Foundation of CQ CSTC （Chongqing Science and Technology Commission） （2008BA3026）.
文摘The power transformer is the key equipment of transforming voltage and exchanging power in the power system.It's safe and reliable operation directly influences the safe level of the power system.To study the risk assessment of power transformer which is very significant to improve the reliability of the power system,a fuzzy comprehensive risk assessment model of power transformer based on Borda number theory is proposed in this paper.At first,the fault types and risk factors of the power transformer are analyzed.Secondly,the basic framework of the fuzzy comprehensive evaluation is applied to quantify the risk factors.And then,Borda number theory is employed to analyze influence degree and occurrence probability of power transformer.At last,the various risk factors impact index and fuzzy comprehensive evaluation index of power transformer can be easily obtained.Applying this model,the relative importance degree of the risk factors can be horizontally compared according to the numerical index,the engineering staff can directly get the parameters of the transformer risk level and get a good description of the visual expression through using 5 score and similar visual language.
基金supported by the National Science Fund for Distinguished Young Scholars of China(70625005).
文摘The class of multiple attribute decision making （MADM） problems is studied, where the attribute values are intuitionistic fuzzy numbers, and the information about attribute weights is completely unknown. A score function is first used to calculate the score of each attribute value and a score matrix is constructed, and then it is transformed into a normalized score matrix. Based on the normalized score matrix, an entropy-based procedure is proposed to derive attribute weights. Furthermore, the additive weighted averaging operator is utilized to fuse all the normalized scores into the overall scores of alternatives, by which the ranking of all the given alternatives is obtained. This paper is concluded by extending the above results to interval-valued intuitionistic fuzzy set theory, and an illustrative example is also provided.
文摘自顶向下的模糊模式树(pattern tree top-down,PTTD)是一种基于相似性度量的模式树归纳方法,在构建过程中采用集束搜索策略,以贪婪方式搜索候选树空间,导致模型构建时间较长。为了解决这一问题,提出一种基于模糊规则插值技术的PTTD优化方法(PTTD-FRI)。首先,设计了一种新的搜索优化策略,简化了模型构建的搜索空间,构造稀疏规则库;然后,提出了一种模糊模式树规则转换方法,将复杂的模糊模式树拆分为多条仅包含三角范数的模糊规则,并用三角余范数聚合;最后,引入模糊规则插值模块,通过简单的计算,进一步完善规则库,提升分类性能。实验结果表明,PTTD-FRI在保持相近分类准确率的情况下,有效提升了模型训练效率,降低了模型复杂度。
文摘为有效评估和降低海上平台穿刺风险,提出一种基于事故树分析(fault tree analysis,FTA)和贝叶斯网络(Bayesian network,BN)的混合风险识别模型。根据相关事故报告和现有文献,构建海上平台穿刺事故的事故树模型。结合模糊集理论和事故树模型计算基本事件的概率,并根据映射规则将事故树模型转换为BN模型。通过BN模型的诊断推理和敏感性分析识别海上平台穿刺事故的关键影响因素。结果表明:导致海上平台穿刺事故的关键影响因素为安全培训不足、人员应急经验不足、应急预案不完善、管理者决策失误以及穿刺发生突然且剧烈。该模型可以有效评估海上平台穿刺风险,并为制定有针对性的风险防控措施提供科学依据。
