By Bauml, Eggers, Tzschoppe, Huber
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Extra info for A Channel Model for Watermarks Subject to Desynchronization Attacks
4. 3 seconds to erase the letters. 25 second respectively. It is easy to verify that the model behaves correctly according the functionality speciﬁcation in the tool of TAU2. However, we will see a diﬀerent picture when we look at the behaviour of the implementation (working with the physical time). 3 gives a snapshot of the output of the implementation. We can see that after several iterations, the accumulated timing errors has led to an incorrect output sequence. 4 Incorrect functionality caused by duration actions: Not only can accumulated timing errors lead to incorrect event order, computation expense of individual actions can also result in unexpected behaviour.
3] and  and activity diagrams . Although these articles are sound and inspiring, they do not study the semantics of multiple diagrams combined. In this paper, we show how we can formalize the behavior of UML diagrams, including the combined behavior of several diagrams, using Rialto. Rialto is an intermediate language that can be used to describe multiple models of computation. A model of computation is a domain speciﬁc, often intuitive, understanding of how the computations in that domain are done: it encompasses the designer’s notion of physical processes, or the “laws of physics” that govern component interactions.
Although SDL-2000 uses a virtual time to count the time passing in its models, SDL-96 adopts physical time. 5. , they represent diﬀerence between the virtual time and the physical time of the issuing actions. 6. A timed execution trace is a state sequence with a time interval attached to every state. If two timed execution traces are -neighbouring, they have exactly the same state sequence and the least upper bound of the absolute diﬀerence between the left-end points of the corresponding intervals is less than or equal to .