A new approach is proposed to generate flexible featrure based models (FFBM), which can be modified dynamically. BRep/CSFG/FRG hybrid scheme is used to describe FFBM, in which BRep explicitly defines the model, CSFG ...A new approach is proposed to generate flexible featrure based models (FFBM), which can be modified dynamically. BRep/CSFG/FRG hybrid scheme is used to describe FFBM, in which BRep explicitly defines the model, CSFG (Constructive solid feature geometry) tree records the feature based modelling procedure and FRG (Feature relation graph) reflects different knids of relationship among features. Topological operators with local retrievability are designed to implement feature addition, which is traced by topological operation list (TOL) in detail. As a result, FFBM can be modified directly in the system database. Related features' chain reactions and variable topologies are supported in design modification, after which the product information adhering on features will not be lost. Further, a feature can be modified as rapidly as it was added.展开更多
物联网(Internet of Things,IoT)的大规模部署应用,使得有漏洞的物联网设备也可能联入网中。攻击者利用有漏洞的设备接入目标内部网络,就可潜伏伺机发起进一步的攻击。为防范这类攻击,需要开发一种对可疑设备接入控制并管理内部设备的...物联网(Internet of Things,IoT)的大规模部署应用,使得有漏洞的物联网设备也可能联入网中。攻击者利用有漏洞的设备接入目标内部网络,就可潜伏伺机发起进一步的攻击。为防范这类攻击,需要开发一种对可疑设备接入控制并管理内部设备的安全机制。首先,为实现对可疑设备的接入控制,文中给出了一种设备识别方法,通过设置白名单,构建通信流量特征指纹,使用随机森林方法来训练设备识别模型;其次,为管理内部设备,提出了一种智能安全管理模型,构建基于资产、漏洞、安全机制等的本体威胁模型;最后,通过实验验证了设备识别模型的检测效果,其识别准确率达到96%以上,并将其与已有类似方法进行对比,结果证明了所提方法具有更好的检测稳定性。展开更多
文摘A new approach is proposed to generate flexible featrure based models (FFBM), which can be modified dynamically. BRep/CSFG/FRG hybrid scheme is used to describe FFBM, in which BRep explicitly defines the model, CSFG (Constructive solid feature geometry) tree records the feature based modelling procedure and FRG (Feature relation graph) reflects different knids of relationship among features. Topological operators with local retrievability are designed to implement feature addition, which is traced by topological operation list (TOL) in detail. As a result, FFBM can be modified directly in the system database. Related features' chain reactions and variable topologies are supported in design modification, after which the product information adhering on features will not be lost. Further, a feature can be modified as rapidly as it was added.
文摘物联网(Internet of Things,IoT)的大规模部署应用,使得有漏洞的物联网设备也可能联入网中。攻击者利用有漏洞的设备接入目标内部网络,就可潜伏伺机发起进一步的攻击。为防范这类攻击,需要开发一种对可疑设备接入控制并管理内部设备的安全机制。首先,为实现对可疑设备的接入控制,文中给出了一种设备识别方法,通过设置白名单,构建通信流量特征指纹,使用随机森林方法来训练设备识别模型;其次,为管理内部设备,提出了一种智能安全管理模型,构建基于资产、漏洞、安全机制等的本体威胁模型;最后,通过实验验证了设备识别模型的检测效果,其识别准确率达到96%以上,并将其与已有类似方法进行对比,结果证明了所提方法具有更好的检测稳定性。
