The world heritage is the resource and wealth shared by the people of the world,and it has very important value.With beautiful scenery and splendid culture,China is a country which has a wealth of heritage resources.B...The world heritage is the resource and wealth shared by the people of the world,and it has very important value.With beautiful scenery and splendid culture,China is a country which has a wealth of heritage resources.By 2016,50world heritage sites in China were named the World Natural and Cultural Heritage by the UNESCO including35world culture heritages,11world natural heritages and 4both cultural and natural heritages.This paper summarizes the general situation of the world heritage sites in China,describes protective measures of Chinese world heritage sites,analyzes the exiting problems and then puts forward proposals to further strengthen the protection of world heritages.展开更多
为了识别电力信息物理融合系统(Cyber Physical Power System,CPPS)脆弱性并制定相应脆弱性防控策略,从结构的角度,建立电力网为IEEE118节点系统、双星型信息网和网型信息网2种具有不同子网络结构的CPPS相依网络模型.提出一种相依节点...为了识别电力信息物理融合系统(Cyber Physical Power System,CPPS)脆弱性并制定相应脆弱性防控策略,从结构的角度,建立电力网为IEEE118节点系统、双星型信息网和网型信息网2种具有不同子网络结构的CPPS相依网络模型.提出一种相依节点对重要度综合指标,该指标可以辨识对CPPS结构脆弱性产生重大影响的相依节点对,克服单层网络指标的局限性.基于相依网络连锁故障模型,分别采用随机攻击策略和蓄意攻击策略,分析2种CPPS的结构脆弱性,并研究关键节点保护策略对2种CPPS结构脆弱性的影响.仿真结果表明,随机攻击策略下,网型信息网CPPS的结构比双星型信息网CPPS更加脆弱.蓄意攻击策略下,优先攻击相依节点对对网络连通性的破坏程度更大.合理选取关键节点保护策略的保护节点可以改善系统的结构脆弱性.展开更多
文摘The world heritage is the resource and wealth shared by the people of the world,and it has very important value.With beautiful scenery and splendid culture,China is a country which has a wealth of heritage resources.By 2016,50world heritage sites in China were named the World Natural and Cultural Heritage by the UNESCO including35world culture heritages,11world natural heritages and 4both cultural and natural heritages.This paper summarizes the general situation of the world heritage sites in China,describes protective measures of Chinese world heritage sites,analyzes the exiting problems and then puts forward proposals to further strengthen the protection of world heritages.
文摘为了识别电力信息物理融合系统(Cyber Physical Power System,CPPS)脆弱性并制定相应脆弱性防控策略,从结构的角度,建立电力网为IEEE118节点系统、双星型信息网和网型信息网2种具有不同子网络结构的CPPS相依网络模型.提出一种相依节点对重要度综合指标,该指标可以辨识对CPPS结构脆弱性产生重大影响的相依节点对,克服单层网络指标的局限性.基于相依网络连锁故障模型,分别采用随机攻击策略和蓄意攻击策略,分析2种CPPS的结构脆弱性,并研究关键节点保护策略对2种CPPS结构脆弱性的影响.仿真结果表明,随机攻击策略下,网型信息网CPPS的结构比双星型信息网CPPS更加脆弱.蓄意攻击策略下,优先攻击相依节点对对网络连通性的破坏程度更大.合理选取关键节点保护策略的保护节点可以改善系统的结构脆弱性.
