Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7148
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Report Implementing Fault-Tolerance in Real-Time Systems by Automatic Program Transformations(Association for Computing Machinery (ACM), 2006) Ayav, Tolga; Fradet, Pascal; Girault, AlainWe present a formal approach to implement and certify fault-tolerance in real-time embedded systems. The fault-intolerant initial system consists of a set of independent periodic tasks scheduled onto a set of fail-silent processors. We transform the tasks such that, assuming the availability of an additional spare processor, the system tolerates one failure at a time (transient or permanent). Failure detection is implemented using heartbeating, and failure masking using checkpointing and roll-back. These techniques are described and implemented by automatic program transformations on the tasks' programs. The proposed formal approach to fault-tolerance by program transformation highlights the benefits of separation of concerns and allows us to establish correctness properties.Conference Object Citation - Scopus: 2Towards Test Case Generation for Synthesizable Vhdl Programs Using Model Checker(Institute of Electrical and Electronics Engineers Inc., 2010) Ayav, Tolga; Tuğlular, Tuğkan; Belli, FevziVHDL programs are often tested by means of simulations, relying on test benches written intuitively. In this paper, we propose a formal approach to construct test benches from system specification. To consider the real-time properties of VHDL programs, we first transform them to timed automata and then perform model checking against the properties designated from the specification. Counterexamples returned from the model checker serve as a basis of test cases, i.e. they are used to form a test bench. The approach is demonstrated and complemented by a simple case study.