Download ABZ 2014: The Landing Gear Case Study: Case Study Track, by Frédéric Boniol, Virginie Wiels, Yamine Ait Ameur, PDF

By Frédéric Boniol, Virginie Wiels, Yamine Ait Ameur, Klaus-Dieter Schewe (eds.)

This quantity includes court cases of the Case learn music, held on the 4th foreign convention, ABZ 2014, in Toulouse, France, in June 2014. The eleven papers offered have been conscientiously reviewed and chosen from various submissions. They use diversified formal options: B, ASM, Fiacre. in addition they suggest other forms of verification equivalent to facts, version checking, try out new release, run-time tracking, and simulation.

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Extra info for ABZ 2014: The Landing Gear Case Study: Case Study Track, Held at the 4th International Conference on Abstract State Machines, Alloy, B, TLA, VDM, and Z, Toulouse, France, June 2-6, 2014. Proceedings

Sample text

This is the purpose of the next approach. 1 Third Approach Introduction In this approach, the idea is to tabulate the behavior of the system. For this, we introduce three constants “tables”: the relation N (for next), the function R (for reverse) and the function T (for timing). 2 opn_ev → 7000, cls_ev → 7000, rtr_ev → 10000, dpr_ev → 10000 } Refinement Strategy The refinement strategy is similar to that used in the previous approach. 3 About This Approach The tabulation done in this approach is very efficient with regards to the number of proof obligations: we have 341 of them only.

This corresponds to the following trace: act1 → beg_prs → end_prs → act2 → chg3 → act5 → beg_dpr → end_dpr 32 W. -R. Abrial If the change occurs while the doors are opening (but the doors are not completely open yet), then the next step in the environment consists in closing the door and then depressurizing. Here is the corresponding trace: act1 → beg_prs → end_prs → act2 → beg_opn → chg3 → end_cls → act5 → beg_dpr → end_dpr If the change occurs once the doors are open, then the next steps consist for the environment to start closing the doors, then closing them, and then depressurizing.

Likewise, starting the opening of the doors is constrained by a change in the handle position. At this level of abstraction, each device is directly influenced by others: we have no intermediate agent doing that job. It is as if each device were mechanically connected to others in order to influence them or be influenced by them. In a subsequent refinement, we introduce the software. Devices are again independent, but the introduced piece of software contains the intelligence that influence their behavior.

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