Grid computing is concerned with the sharing and coordinated use of diverse resources in distributed “virtual organizations”. The heterogeneous, dynamic and multi-domain nature of these environments makes challengin...Grid computing is concerned with the sharing and coordinated use of diverse resources in distributed “virtual organizations”. The heterogeneous, dynamic and multi-domain nature of these environments makes challenging security issues that demand new technical approaches. Despite the recent advances in access control approaches applicable to Grid computing, there remain issues that impede the development of effective access control models for Grid applications. Among them there are the lack of context-based models for access control, and reliance on identity or capability-based access control schemes. An access control scheme that resolve these issues is presented, and a dynamically authorized role-based access control (D-RBAC) model extending the RBAC with context constraints is proposed. The D-RABC mechanisms dynamically grant permissions to users based on a set of contextual information collected from the system and user’s environments, while retaining the advantages of RBAC model. The implementation architecture of D-RBAC for the Grid application is also described.展开更多
采用金属硅化物扩散层分隔技术制备了源漏区具有不同硅化物挡板尺寸的环型栅PD SOI MOSFETs,通过CLP实验数据分析器件的硅化物隔离档板的尺寸对SOI NMOSTET抗ESD能力以及对多指栅ggnMOS管子导通均匀性的影响。结果显示,采用了硅化物隔...采用金属硅化物扩散层分隔技术制备了源漏区具有不同硅化物挡板尺寸的环型栅PD SOI MOSFETs,通过CLP实验数据分析器件的硅化物隔离档板的尺寸对SOI NMOSTET抗ESD能力以及对多指栅ggnMOS管子导通均匀性的影响。结果显示,采用了硅化物隔离挡板的管子二次击穿电压明显提高;随着挡板尺寸增加,多指栅的导通均匀性得到明显改善。展开更多
基金Supported by the National Natural Science Foundation of China (No.60403027) .
文摘Grid computing is concerned with the sharing and coordinated use of diverse resources in distributed “virtual organizations”. The heterogeneous, dynamic and multi-domain nature of these environments makes challenging security issues that demand new technical approaches. Despite the recent advances in access control approaches applicable to Grid computing, there remain issues that impede the development of effective access control models for Grid applications. Among them there are the lack of context-based models for access control, and reliance on identity or capability-based access control schemes. An access control scheme that resolve these issues is presented, and a dynamically authorized role-based access control (D-RBAC) model extending the RBAC with context constraints is proposed. The D-RABC mechanisms dynamically grant permissions to users based on a set of contextual information collected from the system and user’s environments, while retaining the advantages of RBAC model. The implementation architecture of D-RBAC for the Grid application is also described.
文摘采用金属硅化物扩散层分隔技术制备了源漏区具有不同硅化物挡板尺寸的环型栅PD SOI MOSFETs,通过CLP实验数据分析器件的硅化物隔离档板的尺寸对SOI NMOSTET抗ESD能力以及对多指栅ggnMOS管子导通均匀性的影响。结果显示,采用了硅化物隔离挡板的管子二次击穿电压明显提高;随着挡板尺寸增加,多指栅的导通均匀性得到明显改善。
