信息物理融合系统的时间需求一致性分析

信息物理融合系统(cyber-physical system，简称CPS)蕴藏着巨大的潜在应用价值.时间在CPS中起到非常重要的作用，应该在需求早期阶段明确.提出了一个基于逻辑时钟的CPS时间需求一致性分析框架.首先，构建了CPS软件的时间需求概念模型，提供时间需求和功能需求的基本概念，并给出了概念模型的形式化语义；然后，在模型制导下，从CPS的交互环境特性和约束中提取出其软件时间需求规约.基于形式化语义，定义了时间需求规约的一致性特性.为了支持形式化验证，将时间需求规约转换成NuSMV模型，用CTL公式表述要检测的特性，并使用NuSMV工具实施了一致性检测.

Consistency Analysis of Timing Requirements for Cyber-Physical System

Cyber-Physical Systems (CPSs) have great potentials in several application domains. Time plays an important role in CPS and should be specified in the very early phase of requirements engineering. This paper proposes a framework to model and verify timing requirements for the CPS. To begin with, a conceptual model is presented for providing basic concepts of timing and functional requirements. Guided by this model, the CPS software timing requirement specification can be obtained from CPS environment properties and constraints. To support formal verification, formal semantics for the conceptual model is provided. Based on the semantics, the consistency properties of the timing requirements specification are defined and expressed as CTL formulas. The timing requirements specification is transformed into a NuSMV model and checked by this well-known model checker.