Krzysztof Sacha

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The paper describes syntax, behavior and formal semantics of a new class of timed automata, which are tailored for modeling the behavior of real-time systems. A formal method for automatic generation of programs is developed around this model. The method starts from modeling the desired behavior of the system under design by means of a UML-based state(More)
A method is described for modeling, verification and automatic generation of code for PLC controllers. The modeling of requirements and the implementation of code are based on a definition of a finite state time machine. The verification process uses UPPAAL, a model checking tool for the networks of timed automata. A conversion between both models is done(More)
The paper describes the specification method for dependable systems, called Transnet. The method offers a formal notation for describing the software structure, the means for defining safe and un-safe states and techniques for the software simulation and analysis. The modeling process is based on an extension to Petri nets, which enables the modeler to(More)
Authors describe and discuss cases of massive haemorrhage after percutaneous nephrolithotomy. In 10 (0.3%) of 3080 patients who underwent PCNL massive haemorrhage from renal fistula drain or urinary bladder was observed. Renal arteriography was performed in this group, of patients which revealed arterioveneous fistulae in 4 patients and aneurysms of renal(More)