共查询到10条相似文献,搜索用时 46 毫秒
1.
刘红梅 《数字社区&智能家居》2007,1(5):1394
介绍了操作系统的安全机制和几种访问控制模型,在对模型进行比较的基础上,提出采用多种模型相结合的方法,能够满足操作系统保密性与完整性要求。 相似文献
2.
刘红梅 《数字社区&智能家居》2007,(3):1394-1394,1400
介绍了操作系统的安全机制和几种访问控制模型,在对模型进行比较的基础上,提出采用多种模型相结合的方法,能够满足操作系统保密性与完整性要求。 相似文献
3.
4.
For most biophysical domains, differences in model structures are seldom quantified. Here, we used a taxonomy-based approach to characterise thirteen rice models. Classification keys and binary attributes for each key were identified, and models were categorised into five clusters using a binary similarity measure and the unweighted pair-group method with arithmetic mean. Principal component analysis was performed on model outputs at four sites. Results indicated that (i) differences in structure often resulted in similar predictions and (ii) similar structures can lead to large differences in model outputs. User subjectivity during calibration may have hidden expected relationships between model structure and behaviour. This explanation, if confirmed, highlights the need for shared protocols to reduce the degrees of freedom during calibration, and to limit, in turn, the risk that user subjectivity influences model performance. 相似文献
5.
6.
基于领域模型的需求获取方法* 总被引:3,自引:0,他引:3
运用领域工程的思想,提出了基于领域模型的系统需求获取方法。该方法可识别应用系统中的共同特征,并抽象这些特征形成领域模型。通过领域模型,引导用户给出完整的系统需求。 相似文献
7.
8.
工作流平台中动态流程模型的研究* 总被引:1,自引:0,他引:1
在已有的动态工作流模型——黑盒模型的基础上进行改进,应用可插拔的子流程节点代替黑盒节点,提出了更加容易实现的动态流程模型——DSP(Dynamic SubProcess)模型,并成功地将其应用于网络化集成产品开发项目管理工具的项目中。 相似文献
9.
Ivan Porres 《Software and Systems Modeling》2005,4(4):368-385
A rule-based update transformation is a model transformation where a single model is transformed in place. A model refactoring is a model transformation that improves the design described in the model. A refactoring should only affect a previously chosen subset of the original model. In this paper, we discuss how to define and execute model refactorings as rule-based transformations in the context of the UML and MOF standards. We also present an experimental tool to execute this kind of transformation. 相似文献
10.
数字城市模型服务系统设计 总被引:1,自引:0,他引:1
提出了数字城市建设应当在"数据服务"的基础上向"应用服务"转变,指出了"应用服务"的两个方面:面向公众的信息服务和面向专业领域的信息服务.针时讨论较少的后一种应用问题,设计了数字城市的模型服务系统来支持所需的信息服务.讨论了系统在数字城市应用服务平台中的地位和作用,分析了系统的结构,提出了模型的接口规范和系统的工作流程.最后,对实现的教字城市模型服务系统原型进行了探讨. 相似文献