As a payload support system deployed on satellites,the turntable system is often switched among different working modes during the on-orbit operation,which can experience great state changes.In each mode,the missions ...As a payload support system deployed on satellites,the turntable system is often switched among different working modes during the on-orbit operation,which can experience great state changes.In each mode,the missions to be completed are different,consecutive and non-over-lapping,from which the turntable system can be considered to be a phased-mission system(PMS).Reliability analysis for PMS has been widely studied.However,the system mode cycle characteristic has not been taken into account before.In this paper,reliability analysis method of the satellite turntable system is proposed considering its multiple operation modes and mode cycle characteristic.Firstly,the multi-valued decision diagrams(MDD)manipulation rules between two adjacent mission cycles are proposed.On this basis,MDD models for the turntable system in different states are established and the reliability is calculated using the continuous time Markov chains(CTMC)method.Finally,the comparative study is carried out to show the effectiveness of our proposed method.展开更多
The hesitancy fuzzy graphs(HFGs),an extension of fuzzy graphs,are useful tools for dealing with ambiguity and uncertainty in issues involving decision-making(DM).This research implements a correlation coefficient meas...The hesitancy fuzzy graphs(HFGs),an extension of fuzzy graphs,are useful tools for dealing with ambiguity and uncertainty in issues involving decision-making(DM).This research implements a correlation coefficient measure(CCM)to assess the strength of the association between HFGs in this article since CCMs have a high capacity to process and interpret data.The CCM that is proposed between the HFGs has better qualities than the existing ones.It lowers restrictions on the hesitant fuzzy elements’length and may be used to establish whether the HFGs are connected negatively or favorably.Additionally,a CCMbased attribute DM approach is built into a hesitant fuzzy environment.This article suggests the use of weighted correlation coefficient measures(WCCMs)using the CCM concept to quantify the correlation between two HFGs.The decisionmaking problems of hesitancy fuzzy preference relations(HFPRs)are considered.This research proposes a new technique for assessing the relative weights of experts based on the uncertainty of HFPRs and the correlation coefficient degree of each HFPR.This paper determines the ranking order of all alternatives and the best one by using the CCMs between each option and the ideal choice.In the meantime,the appropriate example is given to demonstrate the viability of the new strategies.展开更多
Importance analysis quantifies the critical degree of individual component. Compared with the traditional binary state system,importance analysis of the multi-state system is more aligned with the practice. Because th...Importance analysis quantifies the critical degree of individual component. Compared with the traditional binary state system,importance analysis of the multi-state system is more aligned with the practice. Because the multi-valued decision diagram( MDD) can reflect the relationship between the components and the system state bilaterally, it was introduced into the reliability calculation of the multi-state system( MSS). The building method,simplified criteria,and path search and probability algorithm of MSS structure function MDD were given,and the reliability of the system was calculated. The computing methods of importance based on MDD and direct partial logic derivatives( DPLD) were presented. The diesel engine fuel supply system was taken as an example to illustrate the proposed method. The results show that not only the probability of the system in each state can be easily obtained,but also the influence degree of each component and its state on the system reliability can be obtained,which is conducive to the condition monitoring and structure optimization of the system.展开更多
当今世界由于经济、科技、地缘战略、国际秩序等问题频繁爆发冲突事件,冲突规模正由个体冲突、小规模群体冲突向复杂大规模群体冲突转变。相较于个体间的冲突,大规模群体冲突事件持续时间更长、波及范围更广,易对我国的社会秩序以及经...当今世界由于经济、科技、地缘战略、国际秩序等问题频繁爆发冲突事件,冲突规模正由个体冲突、小规模群体冲突向复杂大规模群体冲突转变。相较于个体间的冲突,大规模群体冲突事件持续时间更长、波及范围更广,易对我国的社会秩序以及经济发展造成恶劣影响。图模型冲突分析(Graph model for conflict resolution,GMCR)理论提供了分析冲突、解决矛盾的有效方案,作为一门专业解决冲突问题的理论工具已经在水资源、环境管理和经济政策等领域得到广泛应用,并取得良好效果。然而,随着冲突事件参与者日渐增多、主体的策略日趋复杂形成了指数级增加的局势,以及主体的偏好行为不确定性加强,传统的决策支持系统GMCRⅡ难以求解此类复杂冲突问题。基于强度偏好冲突分析理论的代数表达,开发了基于.NET平台的冲突分析WEB系统SP-GMCRDSS,该系统包括可行状态生成、状态转移设置、强度偏好序列生成和稳定性分析引擎4个模块,对比现有的系统,SP-GMCRDSS能更高效地辅助冲突分析者解决数据驱动下的大型、复杂的冲突。并且运用文本挖掘技术提取决策者策略数据,辅助分析者确定决策支持系统建模信息的输入,降低模型构建的主观性。最后,通过“兰州水污染冲突事件”演示了该系统的建模、求解以及分析的功能。展开更多
基金co-supported by the Natural Science Foundation of China(No.61833016)the Shaanxi Out-standing Youth Science Foundation(No.2020JC-34)+1 种基金the Shaanxi Science and Technology Innovation Team(No.2022TD-24)the Natural Science Foundation of Heilongjiang Province of China(No.LH2021F038).
文摘As a payload support system deployed on satellites,the turntable system is often switched among different working modes during the on-orbit operation,which can experience great state changes.In each mode,the missions to be completed are different,consecutive and non-over-lapping,from which the turntable system can be considered to be a phased-mission system(PMS).Reliability analysis for PMS has been widely studied.However,the system mode cycle characteristic has not been taken into account before.In this paper,reliability analysis method of the satellite turntable system is proposed considering its multiple operation modes and mode cycle characteristic.Firstly,the multi-valued decision diagrams(MDD)manipulation rules between two adjacent mission cycles are proposed.On this basis,MDD models for the turntable system in different states are established and the reliability is calculated using the continuous time Markov chains(CTMC)method.Finally,the comparative study is carried out to show the effectiveness of our proposed method.
基金This research work supported and funded was provided by Vellore Institute of Technology.
文摘The hesitancy fuzzy graphs(HFGs),an extension of fuzzy graphs,are useful tools for dealing with ambiguity and uncertainty in issues involving decision-making(DM).This research implements a correlation coefficient measure(CCM)to assess the strength of the association between HFGs in this article since CCMs have a high capacity to process and interpret data.The CCM that is proposed between the HFGs has better qualities than the existing ones.It lowers restrictions on the hesitant fuzzy elements’length and may be used to establish whether the HFGs are connected negatively or favorably.Additionally,a CCMbased attribute DM approach is built into a hesitant fuzzy environment.This article suggests the use of weighted correlation coefficient measures(WCCMs)using the CCM concept to quantify the correlation between two HFGs.The decisionmaking problems of hesitancy fuzzy preference relations(HFPRs)are considered.This research proposes a new technique for assessing the relative weights of experts based on the uncertainty of HFPRs and the correlation coefficient degree of each HFPR.This paper determines the ranking order of all alternatives and the best one by using the CCMs between each option and the ideal choice.In the meantime,the appropriate example is given to demonstrate the viability of the new strategies.
基金National Natural Science Foundation of China(No.61164009)the Science and Technology Research Project,Department of Education of Jiangxi Province,China(No.GJJ14420)Natural Science Foundation of Jiangxi Province,China(No.20132BAB206026)
文摘Importance analysis quantifies the critical degree of individual component. Compared with the traditional binary state system,importance analysis of the multi-state system is more aligned with the practice. Because the multi-valued decision diagram( MDD) can reflect the relationship between the components and the system state bilaterally, it was introduced into the reliability calculation of the multi-state system( MSS). The building method,simplified criteria,and path search and probability algorithm of MSS structure function MDD were given,and the reliability of the system was calculated. The computing methods of importance based on MDD and direct partial logic derivatives( DPLD) were presented. The diesel engine fuel supply system was taken as an example to illustrate the proposed method. The results show that not only the probability of the system in each state can be easily obtained,but also the influence degree of each component and its state on the system reliability can be obtained,which is conducive to the condition monitoring and structure optimization of the system.
文摘当今世界由于经济、科技、地缘战略、国际秩序等问题频繁爆发冲突事件,冲突规模正由个体冲突、小规模群体冲突向复杂大规模群体冲突转变。相较于个体间的冲突,大规模群体冲突事件持续时间更长、波及范围更广,易对我国的社会秩序以及经济发展造成恶劣影响。图模型冲突分析(Graph model for conflict resolution,GMCR)理论提供了分析冲突、解决矛盾的有效方案,作为一门专业解决冲突问题的理论工具已经在水资源、环境管理和经济政策等领域得到广泛应用,并取得良好效果。然而,随着冲突事件参与者日渐增多、主体的策略日趋复杂形成了指数级增加的局势,以及主体的偏好行为不确定性加强,传统的决策支持系统GMCRⅡ难以求解此类复杂冲突问题。基于强度偏好冲突分析理论的代数表达,开发了基于.NET平台的冲突分析WEB系统SP-GMCRDSS,该系统包括可行状态生成、状态转移设置、强度偏好序列生成和稳定性分析引擎4个模块,对比现有的系统,SP-GMCRDSS能更高效地辅助冲突分析者解决数据驱动下的大型、复杂的冲突。并且运用文本挖掘技术提取决策者策略数据,辅助分析者确定决策支持系统建模信息的输入,降低模型构建的主观性。最后,通过“兰州水污染冲突事件”演示了该系统的建模、求解以及分析的功能。
