High Assurance for Distributed Cyber Physical Systems
September 2015 • Conference Paper
Scott Hissam, Sagar Chaki, Gabriel Moreno
This short paper introduces our architecture and approach to engineering a DART system so that we achieve high assurance in its runtime behavior against a set of formally specified requirements.
This conference paper appears in Proceedings of the 2015 European Conference on Software Architecture Workshops (ECSAW). Article No. 6
Distributed Adaptive Real-Time (DART) systems are interconnected and collaborating systems that continuously must satisfy guaranteed and highly critical requirements (e.g., collision avoidance), while at the same time adapt, smartly, to achieve best-effort and low-critical application requirements (e.g., protection coverage) when operating in dynamic and uncertain environments. This short paper introduces our architecture and approach to engineering a DART system so that we achieve high assurance in its runtime behavior against a set of formally specified requirements. It describes our technique to: (i) ensure asymmetric timing protection between high- and low-critical threads on each node in the DART system, and (ii) verify that the self-adaptation within, and coordination between, the nodes and their interaction with the physical environment do not violate high and low criticality requirements. We present our ongoing research to integrate advances in model-based engineering with compositional analysis techniques to formally verify safety-critical properties demanded in safety-conscious domains such as aviation and automotive; and introduce our DART model problem to demonstrate of our engineering approach.