A method of system structural analysis based on decision making trial and evaluation laboratory together with interpretative structural modeling(DEMATEL-ISM) and entropy is proposed to clarify system structure of comm...A method of system structural analysis based on decision making trial and evaluation laboratory together with interpretative structural modeling(DEMATEL-ISM) and entropy is proposed to clarify system structure of communication networks and analyze mutual influencing degree between different networks.Mutual influencing degree and importance degree of elements are both considered to determine weights of elements,and the entropy of expert judgment results is used to omit unimportant influence relation and simplify system structure.Structural analysis on communication networks system shows that the proposed method can quantificationally present weights and mutual influencing degree of elements,and reasonably simplify system structure.The results indicate the rationality and feasibility of the method.展开更多
为从系统整体角度完成对起落架收放系统的风险辨识和影响分析,将系统理论过程分析(Systematic Theory Process Analysis,STPA)与决策实验室分析-解释结构模型(Decision Making Trial and Evaluation Laboratory Interpretive Structural...为从系统整体角度完成对起落架收放系统的风险辨识和影响分析,将系统理论过程分析(Systematic Theory Process Analysis,STPA)与决策实验室分析-解释结构模型(Decision Making Trial and Evaluation Laboratory Interpretive Structural Modeling,DEMATEL-ISM)相结合来开展分析。首先,定义事故和系统级危险,以民机进近阶段放下起落架为例,运用STPA完成对风险因素的系统化辨识;其次,基于最大平均熵减(Maximum Mean De-entropy,MMDE)算法帮助DEMATEL-ISM模型确定阈值,完成对风险因素影响的重要性分析并识别可能引发系统级危险的风险传递路径,据此挖掘关键致因场景,以给出风险预防建议。结果显示:线路性能退化或失效、位置作动控制组件(Position Action Control Unit,PACU)核心处理器故障为关键原因因素,收放作动筒作动异常、机组成员操作不当、起落架指示灯显示异常、起落架液压选择阀作动异常、PACU信息接收有误为关键结果因素,这些因素均涉及多条可能引发系统级危险的风险传递路径,应予以重点控制。展开更多
如何促进农业机械化可持续发展是一项重要的研究课题,其首要任务是科学评价农业机械化可持续发展(The Evaluation of the Sustainable Development of Agricultural Mechanization,ESDAM)质量。农业机械化可持续发展受诸多因素影响和制...如何促进农业机械化可持续发展是一项重要的研究课题,其首要任务是科学评价农业机械化可持续发展(The Evaluation of the Sustainable Development of Agricultural Mechanization,ESDAM)质量。农业机械化可持续发展受诸多因素影响和制约,该研究通过文献分析、调查和数据解析,利用模糊决策试验与评价实验室(DecisionMakingTrialand Evaluation Laboratory,DEMATEL)和解释结构模型(Interpretive Structure Modeling,ISM)组合方法,分析了影响农业机械化可持续发展各因素之间的关联关系,构建了农业机械化可持续发展评价指标体系。模糊DEMATEL-ISM法能较好地综合主观和客观评价意见,有助于厘清农业机械化可持续发展的主要影响因素。运用ESDAM-PSIR(压力-状态-影响-响应,Pressure-State-Impact-Response,PSIR)模型,对湖北省农业机械化可持续发展进行评价,并对2004—2020年湖北省的13项指标具体数据进行纵向比较,量化结果与湖北省农业机械化发展现状基本一致,所提方法具有可行性。分析结果表明,经济因素是目前农业机械化可持续发展最重要的影响因素,环境因素日益成为值得着重关注的因素,农机工业和科技的发展是将来需要重点考虑的问题。最后根据评价结果提出相应政策建议,为湖北省农业机械化可持续发展提供指导。展开更多
基金Project(20141996018)supported by Aerospace Science Foundation of ChinaProject(2012JZ8005)supported by the Natural Science Fundamental Research Planned Project of Shanxi Province,China
文摘A method of system structural analysis based on decision making trial and evaluation laboratory together with interpretative structural modeling(DEMATEL-ISM) and entropy is proposed to clarify system structure of communication networks and analyze mutual influencing degree between different networks.Mutual influencing degree and importance degree of elements are both considered to determine weights of elements,and the entropy of expert judgment results is used to omit unimportant influence relation and simplify system structure.Structural analysis on communication networks system shows that the proposed method can quantificationally present weights and mutual influencing degree of elements,and reasonably simplify system structure.The results indicate the rationality and feasibility of the method.
文摘为从系统整体角度完成对起落架收放系统的风险辨识和影响分析,将系统理论过程分析(Systematic Theory Process Analysis,STPA)与决策实验室分析-解释结构模型(Decision Making Trial and Evaluation Laboratory Interpretive Structural Modeling,DEMATEL-ISM)相结合来开展分析。首先,定义事故和系统级危险,以民机进近阶段放下起落架为例,运用STPA完成对风险因素的系统化辨识;其次,基于最大平均熵减(Maximum Mean De-entropy,MMDE)算法帮助DEMATEL-ISM模型确定阈值,完成对风险因素影响的重要性分析并识别可能引发系统级危险的风险传递路径,据此挖掘关键致因场景,以给出风险预防建议。结果显示:线路性能退化或失效、位置作动控制组件(Position Action Control Unit,PACU)核心处理器故障为关键原因因素,收放作动筒作动异常、机组成员操作不当、起落架指示灯显示异常、起落架液压选择阀作动异常、PACU信息接收有误为关键结果因素,这些因素均涉及多条可能引发系统级危险的风险传递路径,应予以重点控制。
文摘如何促进农业机械化可持续发展是一项重要的研究课题,其首要任务是科学评价农业机械化可持续发展(The Evaluation of the Sustainable Development of Agricultural Mechanization,ESDAM)质量。农业机械化可持续发展受诸多因素影响和制约,该研究通过文献分析、调查和数据解析,利用模糊决策试验与评价实验室(DecisionMakingTrialand Evaluation Laboratory,DEMATEL)和解释结构模型(Interpretive Structure Modeling,ISM)组合方法,分析了影响农业机械化可持续发展各因素之间的关联关系,构建了农业机械化可持续发展评价指标体系。模糊DEMATEL-ISM法能较好地综合主观和客观评价意见,有助于厘清农业机械化可持续发展的主要影响因素。运用ESDAM-PSIR(压力-状态-影响-响应,Pressure-State-Impact-Response,PSIR)模型,对湖北省农业机械化可持续发展进行评价,并对2004—2020年湖北省的13项指标具体数据进行纵向比较,量化结果与湖北省农业机械化发展现状基本一致,所提方法具有可行性。分析结果表明,经济因素是目前农业机械化可持续发展最重要的影响因素,环境因素日益成为值得着重关注的因素,农机工业和科技的发展是将来需要重点考虑的问题。最后根据评价结果提出相应政策建议,为湖北省农业机械化可持续发展提供指导。
