Safety Analysis in Formal Specification
نویسندگان
چکیده
Formal methods give us techniques to specify the functionality of a system, to verify its correctness or to develop the system stepwise from an abstract specification to its implementation. These aspects are important when designing safety-critical systems. Safety analysis is a vital part of the development of such systems. However, formal methods seldom interface well with the more informal techniques developed for safety analysis. Action systems is a formal approach to distributed computing that has proven its worth in the design of safety-critical systems. The approach is based on a firm mathematical foundation within which the reasoning about the correctness and behaviour of the system under development is carried out. The purpose of this paper is to show how we can incorporate the results of safety analysis into an action system specification by encoding this information via available composition operators for action systems in order to specify robust and safe controllers.
منابع مشابه
Web Service Choreography Verification Using Z Formal Specification
Web Service Choreography Description Language (WS-CDL) describes and orchestrates the services interactions among multiple participants. WS-CDL verification is essential since the interactions would lead to mismatches. Existing works verify the messages ordering, the flow of messages, and the expected results from collaborations. In this paper, we present a Z specification of WS-CDL. Besides ve...
متن کاملFormal Integrity Analysis of Digital ATC Track Database
1. Introduction Railway signalling is a safety critical system. Special hardware for safety has been used in signalling systems. Recently computer has been widely introduced and software is much more responsible for safety. As far as hardware aspect of safety computer is concerned, there has been a lot of progress. Special devices for safety have been developed and used widely. But the safety t...
متن کاملAn effective technique for the software requirements analysis of NPP safety-critical systems, based on software inspection, requirements traceability, and formal specification
A thorough requirements analysis is indispensable for developing and implementing safety-critical software systems such as nuclear power plant (NPP) software systems because a single error in the requirements can generate serious software faults. However, it is very difficult to completely analyze system requirements. In this paper, an effective technique for the software requirements analysis ...
متن کاملA model for specification, composition and verification of access control policies and its application to web services
Despite significant advances in the access control domain, requirements of new computational environments like web services still raise new challenges. Lack of appropriate method for specification of access control policies (ACPs), composition, verification and analysis of them have all made the access control in the composition of web services a complicated problem. In this paper, a new indepe...
متن کاملAn Approach to Safety Analysis and Verification based upon Formal Functional Model
design transforms the semi-formal requirements specification into a formal implicit specification, which will then be further refined into formal explicit specification by detail design. Detail design has two goals: (1) transforming implicit specifications of processes and functions, defined in modules into explicit specifications to serve as a foundation for implementation in a specific progra...
متن کامل