To implement the timeliness of control rules, the term of conditional cycle based on cycle theory and tense RBAC are proposed, and we have defined role restriction, operating request and trigger in the form of conditional cycle expression.
为了实现控制规则的时态性,SCIAC模型在周期理论和时态RBAC的基础上提出了条件周期表达式,并以条件周期表达式为基础定义了角色约束、运行请求和触发器。
参考来源 - 面向VPN的访问控制模型及相关技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
一项隐含的DB 2限制会强制要求bus_start值小于bus_end值，确保时态数据的完整性。
An implicit DB2 constraint enforces that bus_start values are less than bus_end values, ensuring temporal data integrity.
时态在英语语法中的重要性是无可置疑的，但是从篇章学的角度来分析时态的语篇衔接功能的研究还很少。
It is beyond challenge that tense occupies a crucial position in English grammar, but little has been achieved about its cohesive function in text.
在传统语法书里，英语动词过去时被定义为一种指称性的时态，主要用于表述以说话的时间为参照点过去发生的事情或存在的状态。
Traditionally the past tense is defined as a deictic tense mainly used to locate an event or state at some point or period in time prior to the moment of speaking, .
应用推荐