带权角色激活任务和周期时间授权是工作流系统访问控制研究尚未解决的核心问题.以基于角色的访问控制模型为基础,提出了一种新的工作流系统带权角色与周期时间访问控制模型WRPTAC(weighted role and periodic time access control).讨...带权角色激活任务和周期时间授权是工作流系统访问控制研究尚未解决的核心问题.以基于角色的访问控制模型为基础,提出了一种新的工作流系统带权角色与周期时间访问控制模型WRPTAC(weighted role and periodic time access control).讨论了周期时间表示方法,定义了工作流系统授权新概念和时态授权推导规则,给出了时间复杂度为O(n2)的时态授权推导规则一致性验证图论算法,并定义了任务激活约束规则.它能够表达复杂的工作流系统访问控制约束.展开更多
针对传统的RBAC模型不能表达复杂的工作流安全访问控制约束的缺点,提出了一个适合工作流系统的基于多权角色和规则的条件化安全访问控制模型CMWRRBSAC(conditioned multi-weighted role and rule based secure access control model)。...针对传统的RBAC模型不能表达复杂的工作流安全访问控制约束的缺点,提出了一个适合工作流系统的基于多权角色和规则的条件化安全访问控制模型CMWRRBSAC(conditioned multi-weighted role and rule based secure access control model)。该模型基于传统的RBAC模型,提出了基于动态角色分配的条件化RBAC方法,定义了基于多权角色的工作流系统访问授权新概念,并针对多个角色和多个用户协同激活任务的序约束问题,给出了基于令牌的序约束算法和基于加权角色综合的序约束算法,讨论了一个基于规则的职责分离约束建模方法,并给出了改进的规则一致性检验算法。展开更多
Role mining and setup affect the usage of role-based access control(RBAC).Traditionally,user's role and permission assigning are manipulated by security administrator of system.However,the cost is expensive and th...Role mining and setup affect the usage of role-based access control(RBAC).Traditionally,user's role and permission assigning are manipulated by security administrator of system.However,the cost is expensive and the operating process is complex.A new role analyzing method was proposed by generating mappings and using them to provide recommendation for systems.The relation among sets of permissions,roles and users was explored by generating mappings,and the relation between sets of users and attributes was analyzed by means of the concept lattice model,generating a critical mapping between the attribute and permission sets,and making the meaning of the role natural and operational.Thus,a role is determined by permission set and user's attributes.The generated mappings were used to automatically assign permissions and roles to new users.Experimental results show that the proposed algorithm is effective and efficient.展开更多
Iris Murdoch is a renowned female novelist and philosopher in the 20th century English literature. In her literary creation, she has a preference for male narration and holds a reserved attitude to women＇s movements ...Iris Murdoch is a renowned female novelist and philosopher in the 20th century English literature. In her literary creation, she has a preference for male narration and holds a reserved attitude to women＇s movements with reluctance to be considered as a feminist writer, which permits her realistic depiction of female characters and dispassionate thought on women＇s problems. This paper, with the interpretation and redefinition of the concepts as consciousness, identity, and self in Murdoch＇s philosophy, analyzes the fragmented self of three female figures in The Flight from the Enchanter （1956） respectively from the perspectives of self-consciousness, identity, and self and reveals that the fragmentation of female selfhood is mainly due to the overwhelming male dominance in the gender relationship.展开更多
Virginia Woolf＇s To the Lighthouse has gained wide recognition and is regarded by many scholars as her best work This novel is looked upon as an autobiographical novel of her family, and generally considered to repre...Virginia Woolf＇s To the Lighthouse has gained wide recognition and is regarded by many scholars as her best work This novel is looked upon as an autobiographical novel of her family, and generally considered to represent Woolf＇s viewpoint on the relationship between two sexes. In addition to the feminist approach, this paper intends to study complex relations between male and female characters mainly from an archetypal perspective. Based on the study of archetypes in both sexes, we find that the main characters come through various psychological changes, so that their relations can be summed up respectively, as cooperative and finally harmonious展开更多
Our fieldwork at S Banner in Inner Mongolia reveals that the implementation of the ecological migration policy is a social process involving joint participation of multiple social agents including the central governme...Our fieldwork at S Banner in Inner Mongolia reveals that the implementation of the ecological migration policy is a social process involving joint participation of multiple social agents including the central government, local governments, market elites, and farmers and herders. Behind these complex interactions is a network of power and interest constituted by government power, market power and the local people. Local governments function as a node joining different linkages in top-down ecological governance. Their dual role as ＂agent-managers of political power＂ and ＂profit-seeking managers of political power＂ leads to great uncertainty in the realization of environmental protection goals.展开更多
文摘带权角色激活任务和周期时间授权是工作流系统访问控制研究尚未解决的核心问题.以基于角色的访问控制模型为基础,提出了一种新的工作流系统带权角色与周期时间访问控制模型WRPTAC(weighted role and periodic time access control).讨论了周期时间表示方法,定义了工作流系统授权新概念和时态授权推导规则,给出了时间复杂度为O(n2)的时态授权推导规则一致性验证图论算法,并定义了任务激活约束规则.它能够表达复杂的工作流系统访问控制约束.
文摘针对传统的RBAC模型不能表达复杂的工作流安全访问控制约束的缺点,提出了一个适合工作流系统的基于多权角色和规则的条件化安全访问控制模型CMWRRBSAC(conditioned multi-weighted role and rule based secure access control model)。该模型基于传统的RBAC模型,提出了基于动态角色分配的条件化RBAC方法,定义了基于多权角色的工作流系统访问授权新概念,并针对多个角色和多个用户协同激活任务的序约束问题,给出了基于令牌的序约束算法和基于加权角色综合的序约束算法,讨论了一个基于规则的职责分离约束建模方法,并给出了改进的规则一致性检验算法。
基金Project(61003140) supported by the National Natural Science Foundation of ChinaProject(013/2010/A) supported by Macao Science and Technology Development FundProject(10YJC630236) supported by Social Science Foundation for the Youth Scholars of Ministry of Education of China
文摘Role mining and setup affect the usage of role-based access control(RBAC).Traditionally,user's role and permission assigning are manipulated by security administrator of system.However,the cost is expensive and the operating process is complex.A new role analyzing method was proposed by generating mappings and using them to provide recommendation for systems.The relation among sets of permissions,roles and users was explored by generating mappings,and the relation between sets of users and attributes was analyzed by means of the concept lattice model,generating a critical mapping between the attribute and permission sets,and making the meaning of the role natural and operational.Thus,a role is determined by permission set and user's attributes.The generated mappings were used to automatically assign permissions and roles to new users.Experimental results show that the proposed algorithm is effective and efficient.
文摘Iris Murdoch is a renowned female novelist and philosopher in the 20th century English literature. In her literary creation, she has a preference for male narration and holds a reserved attitude to women＇s movements with reluctance to be considered as a feminist writer, which permits her realistic depiction of female characters and dispassionate thought on women＇s problems. This paper, with the interpretation and redefinition of the concepts as consciousness, identity, and self in Murdoch＇s philosophy, analyzes the fragmented self of three female figures in The Flight from the Enchanter （1956） respectively from the perspectives of self-consciousness, identity, and self and reveals that the fragmentation of female selfhood is mainly due to the overwhelming male dominance in the gender relationship.
文摘Virginia Woolf＇s To the Lighthouse has gained wide recognition and is regarded by many scholars as her best work This novel is looked upon as an autobiographical novel of her family, and generally considered to represent Woolf＇s viewpoint on the relationship between two sexes. In addition to the feminist approach, this paper intends to study complex relations between male and female characters mainly from an archetypal perspective. Based on the study of archetypes in both sexes, we find that the main characters come through various psychological changes, so that their relations can be summed up respectively, as cooperative and finally harmonious
文摘Our fieldwork at S Banner in Inner Mongolia reveals that the implementation of the ecological migration policy is a social process involving joint participation of multiple social agents including the central government, local governments, market elites, and farmers and herders. Behind these complex interactions is a network of power and interest constituted by government power, market power and the local people. Local governments function as a node joining different linkages in top-down ecological governance. Their dual role as ＂agent-managers of political power＂ and ＂profit-seeking managers of political power＂ leads to great uncertainty in the realization of environmental protection goals.
