针对非法用户越权访问公司内部数据引起的安全问题,提出了组合公钥(combined public key,CPK)和角色访问控制(role access control,RBAC)相结合的改进模型.通过保留RBAC96模型中继承约束关系的基础上,去除RBAC97模型中继承关系的复杂度...针对非法用户越权访问公司内部数据引起的安全问题,提出了组合公钥(combined public key,CPK)和角色访问控制(role access control,RBAC)相结合的改进模型.通过保留RBAC96模型中继承约束关系的基础上,去除RBAC97模型中继承关系的复杂度,引入用户组概念.其中每个密钥代表不同的权限,同时对密钥赋予相应的用户.不同密钥保护不同的文档,不同用户分配不同的密钥,合法用户只有根据自己密钥权限才可以解密相应的文档,加强了访问控制模型的安全.通过测试结果证明,该方案在系统中运行正常,并验证了方案的可行性.展开更多
The explosive development of mobile communications and networking has led to the creation of an extremely complex system,which is difficult to manage.Hence,we propose an AI-powered network framework that uses AI techn...The explosive development of mobile communications and networking has led to the creation of an extremely complex system,which is difficult to manage.Hence,we propose an AI-powered network framework that uses AI technologies to operate the network automatically.However,due to the separation between different mobile network operators,data barriers between diverse operators become bottlenecks to exploit the full power of AI.In this paper,we establish a mutual trust data sharing framework to break these data barriers.The framework is based on the distributed and temper-proof attributes of blockchain.We implement a prototype based on Hyperledger Fabric.The proposed system combines supervision and fine-grained data access control based on smart contracts,which provides a secure and trustless environment for data sharing.We further compare our system with existing data sharing schemes,and we find that our system provides a better functionality.展开更多
背景传统的氧疗策略通过增加FiO：及机械通气以维持正常（甚至超常）的动脉氧合，并认为过多的氧气优于氧气不足，且忽视了不同个体对氧气的反应存在差异，这容易引起氧中毒及高氧血症，甚至会影响危重病患者的预后。目的对近期目标导...背景传统的氧疗策略通过增加FiO：及机械通气以维持正常（甚至超常）的动脉氧合，并认为过多的氧气优于氧气不足，且忽视了不同个体对氧气的反应存在差异，这容易引起氧中毒及高氧血症，甚至会影响危重病患者的预后。目的对近期目标导向性氧合管理的基础理论及临床探索进行综述，为进一步的研究及讨论提供理论支持。内容阐述危重病患者低氧耐受机制及高氧血症的危害，进而讨论允许性低氧血症（permissive hypoxemia，PH）的理论基础及应用前景，精确动脉氧合控制（precise control of arterial oxygenation，PCAO）及FiO2安全阈值的应用价值，并介绍组织氧合监测的方法。趋向目标导向性氧合管理旨在进一步减少氧疗的副作用，可能成为危重病患者氧疗的新方向，但还需要进一步研究证实其安全性及有效性。展开更多
文摘针对非法用户越权访问公司内部数据引起的安全问题,提出了组合公钥(combined public key,CPK)和角色访问控制(role access control,RBAC)相结合的改进模型.通过保留RBAC96模型中继承约束关系的基础上,去除RBAC97模型中继承关系的复杂度,引入用户组概念.其中每个密钥代表不同的权限,同时对密钥赋予相应的用户.不同密钥保护不同的文档,不同用户分配不同的密钥,合法用户只有根据自己密钥权限才可以解密相应的文档,加强了访问控制模型的安全.通过测试结果证明,该方案在系统中运行正常,并验证了方案的可行性.
文摘The explosive development of mobile communications and networking has led to the creation of an extremely complex system,which is difficult to manage.Hence,we propose an AI-powered network framework that uses AI technologies to operate the network automatically.However,due to the separation between different mobile network operators,data barriers between diverse operators become bottlenecks to exploit the full power of AI.In this paper,we establish a mutual trust data sharing framework to break these data barriers.The framework is based on the distributed and temper-proof attributes of blockchain.We implement a prototype based on Hyperledger Fabric.The proposed system combines supervision and fine-grained data access control based on smart contracts,which provides a secure and trustless environment for data sharing.We further compare our system with existing data sharing schemes,and we find that our system provides a better functionality.
文摘背景传统的氧疗策略通过增加FiO：及机械通气以维持正常（甚至超常）的动脉氧合，并认为过多的氧气优于氧气不足，且忽视了不同个体对氧气的反应存在差异，这容易引起氧中毒及高氧血症，甚至会影响危重病患者的预后。目的对近期目标导向性氧合管理的基础理论及临床探索进行综述，为进一步的研究及讨论提供理论支持。内容阐述危重病患者低氧耐受机制及高氧血症的危害，进而讨论允许性低氧血症（permissive hypoxemia，PH）的理论基础及应用前景，精确动脉氧合控制（precise control of arterial oxygenation，PCAO）及FiO2安全阈值的应用价值，并介绍组织氧合监测的方法。趋向目标导向性氧合管理旨在进一步减少氧疗的副作用，可能成为危重病患者氧疗的新方向，但还需要进一步研究证实其安全性及有效性。
