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For modelling hybrid systems, we have extended Event B based on its framework with the differential event. The differential event describes continuous behaviors of hybrid systems by differential equations and evolution constraint, whose proof obligations provide dynamical properties of a model. In order to ensure the safety and reliability of a model, proof obligations should be proved. It is difficult...
Safety requirements are of great importance in Railway Interlocking Systems. However it is still very difficult to obtain all of the safety requirements in practice. In this paper, we propose an approach to capture safety requirements based on safety requirements patterns. From a variety of sources, such as interlocking tables and existing safety relevant functional requirements of railway interlocking...
The safety properties of Cyber-Physical Systems have characteristics of both time and spatial attributes. Although various hybrid logic languages have been proposed to represent and reason both time and spatial attribute, most of them are not concerned on the quantitative problem which is important for mission-critical CPSs to specify and verify safety properties. In this paper, we propose a language...
In recent years, with gradual application of formal verification methods to automatic train control (ATC) systems, the problem of verification failure occurs due to the complexity of the verification system. In order to solve this problem, this paper proposes a safety attribute based projection for the ATC systems. We describe this verification system using Problem Frames approach and define projection...
Green Security Barrier is a non-tariff barriers in currently international trade which is applied by more and more developed countries to comply with, the barriers are in compliance with relevant national trade agreement and nominal reason is reasonable, especially China has been accession to the WTO, and unable to avoidable. At present, our country's many products have great lost because of suffering...
A lot of crashes happened at signalized intersections in the cities. As right-angle crashes at signalized intersection tend to be severe, this paper analyzes factors affecting right-angle crash injury severity. Our study made use of 197 four-legged signalized intersections from Orange and Hillsborough counties, Florida. Information which includes roadway inventory data, traffic control and operational...
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