The recent development of channel technology has promised to reduce the transaction verification time in blockchain operations.When transactions are transmitted through the channels created by nodes,the nodes need to ...The recent development of channel technology has promised to reduce the transaction verification time in blockchain operations.When transactions are transmitted through the channels created by nodes,the nodes need to cooperate with each other.If one party refuses to do so,the channel is unstable.A stable channel is thus required.Because nodes may show uncooperative behavior,they may have a negative impact on the stability of such channels.In order to address this issue,this work proposes a dynamic evolutionary game model based on node behavior.This model considers various defense strategies'cost and attack success ratio under them.Nodes can dynamically adjust their strategies according to the behavior of attackers to achieve their effective defense.The equilibrium stability of the proposed model can be achieved.The proposed model can be applied to general channel networks.It is compared with two state-of-the-art blockchain channels:Lightning network and Spirit channels.The experimental results show that the proposed model can be used to improve a channel's stability and keep it in a good cooperative stable state.Thus its use enables a blockchain to enjoy higher transaction success ratio and lower transaction transmission delay than the use of its two peers.展开更多
Power transmission systems are being operated closer to their stability limits compared to twenty years ago. As a result, an increasing risk of blackouts combined with extremely high costs economically and socially is...Power transmission systems are being operated closer to their stability limits compared to twenty years ago. As a result, an increasing risk of blackouts combined with extremely high costs economically and socially is observed. To reduce this risk the personnel in the control rooms of the transmission system operators have to be assisted by a system, which assesses the dynamic state of security online. The system presented in this paper is designed to investigate the security with regards to voltage stability, transient stability and small signal oscillatory stability. New technologies of visualizing the degree of stability to non dynamic stability experts are used as well as integration in existing SCADA/EMS systems are realized. The performance of the system is sufficiently high to be employed in the online environment of the control room.展开更多
A news agency is an organization that gathers news reports and sells them to subscribing news organization, such as newspapers, magazines, radio and television broadcasters. A news agency may also be referred to as a ...A news agency is an organization that gathers news reports and sells them to subscribing news organization, such as newspapers, magazines, radio and television broadcasters. A news agency may also be referred to as a wire service, newswire, or news service. The main purpose of this paper is to evaluate the security policies and analyze the content of five press agencies in gulf countries which are (Kuwait News Agency (KUNA), Emirates News Agency (WAM), Saudi Press Agency (SPA), Bahrain News Agency (BNA), and Oman News Agency (OMA)) by using a fuzzy VIKOR approach where linguistic variables are applied to solve the uncertainties and subjectivities in expert decision making. Fuzzy VIKOR approach is one of the best Multi-Criteria Decision Making (MCDM) techniques working in fuzzy environment. This study benefits security and content analysis experts know which press agency has the mandate and the competence to educate the public on news agencies. Besides, this paper contributes to Gulf agencies in helping them in their resolve to ensure the quality of content information and information security policies over the internet.展开更多
随着人工智能领域大模型(large model)的广泛应用,大模型,尤其是大语言模型(large language model,LLM)的安全问题受到了广泛关注.大模型作为一种新兴技术,与之相关的安全态势分析以及安全体系建设均亟待挖掘与探索.从社会关系以及技术...随着人工智能领域大模型(large model)的广泛应用,大模型,尤其是大语言模型(large language model,LLM)的安全问题受到了广泛关注.大模型作为一种新兴技术,与之相关的安全态势分析以及安全体系建设均亟待挖掘与探索.从社会关系以及技术应用2个视角,分析了大模型安全的整体趋势.同时,基于大模型自身的特点,梳理了大模型安全能力建设的实践思路,为大模型研发、大模型应用构建提供了安全体系构建的参考方案.介绍的大模型安全能力实践方案包括安全评估基准建设、模型价值观对齐方法、模型线上服务安全系统建设3个部分.展开更多
发动机关键特性对生产线过程能力要求较高,在线测量技术与统计过程控相结合,可以有效探测异常波动,提升产品一致性。本文主要研究在线测量设备的测量系统分析(Measure System Analyse,简称MSA)方法流程,分别从分辨率、测量系统分析方法...发动机关键特性对生产线过程能力要求较高,在线测量技术与统计过程控相结合,可以有效探测异常波动,提升产品一致性。本文主要研究在线测量设备的测量系统分析(Measure System Analyse,简称MSA)方法流程,分别从分辨率、测量系统分析方法研究、测量设备对过程能力的影响及测量设备稳定性分析监控等方面进行分析,判断在线测量设备是否满足测量要求。本文旨在提供一个完整的在线测量设备的测量系统分析流程,为其他在线测量设备提供借鉴经验。展开更多
高比例新能源、电动汽车、储能电站等并网,迫切需要改进电网安全稳定控制技术体系,将海量分散可控资源纳入电网紧急控制范畴。针对紧急控制在线决策需求,该文给出以虚拟电厂(virtual power plant,VPP)为管控形式的分布式能源(distribute...高比例新能源、电动汽车、储能电站等并网,迫切需要改进电网安全稳定控制技术体系,将海量分散可控资源纳入电网紧急控制范畴。针对紧急控制在线决策需求,该文给出以虚拟电厂(virtual power plant,VPP)为管控形式的分布式能源(distributed energy resources,DERs)紧急功率调节能力量化描述和在线评估方法。首先,分析紧急功率调节能力的内涵及表述要求,给出调节能力的量化描述方法;其次,构建反映物理特性及考虑用户行为约束的VPP紧急功率调节能力评估综合模型;最后,给出考虑状态转移及边界约束的紧急功率多时间尺度调节能力计算方法,设计相关仿真计算模块,并实现与PSS/E接口。以含300台电动汽车及1000台空调的VPP为例,仿真验证所述方法的有效性。展开更多
现有通用电力系统仿真软件自动化和智能化程度不高的问题极大影响了安全稳定分析工作的效率。为此,从工程技术人员的实际需求出发,基于电力系统分析综合程序(power system analysis software package,PSASP)设计并开发了电网智能仿真计...现有通用电力系统仿真软件自动化和智能化程度不高的问题极大影响了安全稳定分析工作的效率。为此,从工程技术人员的实际需求出发,基于电力系统分析综合程序(power system analysis software package,PSASP)设计并开发了电网智能仿真计算工具。该工具通过从数据解析与处理、计算功能优化、结果分析自动化3个方面对现有软件进行了优化,提升工作效率。引入达梦数据库系统,实现海量数据的存储、计算、查询和共享。开发了厂站接线图自动绘制功能,可自动实现元件连接关系的可视化展示。开发了运行方式数据自动生成功能,可形成对应海量运行场景的潮流作业数据。开发了静态安全自动分析功能,可进行N-1开断的自动计算和结果的智能分析与展示。最后,以华中电网安全稳定分析为例,验证了智能仿真工具的实用效果。展开更多
基金supported by the National Natural Science Foundation of China(61872006)Scientific Research Activities Foundation of Academic and Technical Leaders and Reserve Candidates in Anhui Province(2020H233)+2 种基金Top-notch Discipline(specialty)Talents Foundation in Colleges and Universities of Anhui Province(gxbj2020057)the Startup Foundation for Introducing Talent of NUISTby Institutional Fund Projects from Ministry of Education and Deanship of Scientific Research(DSR),King Abdulaziz University(KAU),Jeddah,Saudi Arabia(IFPDP-216-22)。
文摘The recent development of channel technology has promised to reduce the transaction verification time in blockchain operations.When transactions are transmitted through the channels created by nodes,the nodes need to cooperate with each other.If one party refuses to do so,the channel is unstable.A stable channel is thus required.Because nodes may show uncooperative behavior,they may have a negative impact on the stability of such channels.In order to address this issue,this work proposes a dynamic evolutionary game model based on node behavior.This model considers various defense strategies'cost and attack success ratio under them.Nodes can dynamically adjust their strategies according to the behavior of attackers to achieve their effective defense.The equilibrium stability of the proposed model can be achieved.The proposed model can be applied to general channel networks.It is compared with two state-of-the-art blockchain channels:Lightning network and Spirit channels.The experimental results show that the proposed model can be used to improve a channel's stability and keep it in a good cooperative stable state.Thus its use enables a blockchain to enjoy higher transaction success ratio and lower transaction transmission delay than the use of its two peers.
文摘Power transmission systems are being operated closer to their stability limits compared to twenty years ago. As a result, an increasing risk of blackouts combined with extremely high costs economically and socially is observed. To reduce this risk the personnel in the control rooms of the transmission system operators have to be assisted by a system, which assesses the dynamic state of security online. The system presented in this paper is designed to investigate the security with regards to voltage stability, transient stability and small signal oscillatory stability. New technologies of visualizing the degree of stability to non dynamic stability experts are used as well as integration in existing SCADA/EMS systems are realized. The performance of the system is sufficiently high to be employed in the online environment of the control room.
文摘A news agency is an organization that gathers news reports and sells them to subscribing news organization, such as newspapers, magazines, radio and television broadcasters. A news agency may also be referred to as a wire service, newswire, or news service. The main purpose of this paper is to evaluate the security policies and analyze the content of five press agencies in gulf countries which are (Kuwait News Agency (KUNA), Emirates News Agency (WAM), Saudi Press Agency (SPA), Bahrain News Agency (BNA), and Oman News Agency (OMA)) by using a fuzzy VIKOR approach where linguistic variables are applied to solve the uncertainties and subjectivities in expert decision making. Fuzzy VIKOR approach is one of the best Multi-Criteria Decision Making (MCDM) techniques working in fuzzy environment. This study benefits security and content analysis experts know which press agency has the mandate and the competence to educate the public on news agencies. Besides, this paper contributes to Gulf agencies in helping them in their resolve to ensure the quality of content information and information security policies over the internet.
文摘随着人工智能领域大模型(large model)的广泛应用,大模型,尤其是大语言模型(large language model,LLM)的安全问题受到了广泛关注.大模型作为一种新兴技术,与之相关的安全态势分析以及安全体系建设均亟待挖掘与探索.从社会关系以及技术应用2个视角,分析了大模型安全的整体趋势.同时,基于大模型自身的特点,梳理了大模型安全能力建设的实践思路,为大模型研发、大模型应用构建提供了安全体系构建的参考方案.介绍的大模型安全能力实践方案包括安全评估基准建设、模型价值观对齐方法、模型线上服务安全系统建设3个部分.
文摘发动机关键特性对生产线过程能力要求较高,在线测量技术与统计过程控相结合,可以有效探测异常波动,提升产品一致性。本文主要研究在线测量设备的测量系统分析(Measure System Analyse,简称MSA)方法流程,分别从分辨率、测量系统分析方法研究、测量设备对过程能力的影响及测量设备稳定性分析监控等方面进行分析,判断在线测量设备是否满足测量要求。本文旨在提供一个完整的在线测量设备的测量系统分析流程,为其他在线测量设备提供借鉴经验。
文摘高比例新能源、电动汽车、储能电站等并网,迫切需要改进电网安全稳定控制技术体系,将海量分散可控资源纳入电网紧急控制范畴。针对紧急控制在线决策需求,该文给出以虚拟电厂(virtual power plant,VPP)为管控形式的分布式能源(distributed energy resources,DERs)紧急功率调节能力量化描述和在线评估方法。首先,分析紧急功率调节能力的内涵及表述要求,给出调节能力的量化描述方法;其次,构建反映物理特性及考虑用户行为约束的VPP紧急功率调节能力评估综合模型;最后,给出考虑状态转移及边界约束的紧急功率多时间尺度调节能力计算方法,设计相关仿真计算模块,并实现与PSS/E接口。以含300台电动汽车及1000台空调的VPP为例,仿真验证所述方法的有效性。
文摘现有通用电力系统仿真软件自动化和智能化程度不高的问题极大影响了安全稳定分析工作的效率。为此,从工程技术人员的实际需求出发,基于电力系统分析综合程序(power system analysis software package,PSASP)设计并开发了电网智能仿真计算工具。该工具通过从数据解析与处理、计算功能优化、结果分析自动化3个方面对现有软件进行了优化,提升工作效率。引入达梦数据库系统,实现海量数据的存储、计算、查询和共享。开发了厂站接线图自动绘制功能,可自动实现元件连接关系的可视化展示。开发了运行方式数据自动生成功能,可形成对应海量运行场景的潮流作业数据。开发了静态安全自动分析功能,可进行N-1开断的自动计算和结果的智能分析与展示。最后,以华中电网安全稳定分析为例,验证了智能仿真工具的实用效果。
