This paper shows how Ptolemy II discrete-event (DE) models can be formally analyzed using Real-Time Maude. We formalize in RealTime Maude the semantics of a subset of hierarchical Ptolemy II DE models, and explain how the code generation infrastructure of Ptolemy II has been used to automatically synthesize a Real-Time Maude verification model from a Ptolemy II design model. This enables a mode...

This paper defines a real-time rewriting logic semantics for a significant subset of Ptolemy II discreteevent models. This is a challenging task, since such models combine a synchronous fixed-point semantics with hierarchical structure, explicit time, and a rich expression language. The code generation features of Ptolemy II have been leveraged to automatically synthesize a Real-Time Maude veri...

We provide examples of non-locally compact geodesic Ptolemy metric spaces which are not uniquely geodesic. On the other hand, we show that locally compact, geodesic Ptolemy metric spaces are uniquely geodesic. Moreover, we prove that a metric space is CAT(0) if and only if it is Busemann convex and Ptolemy.

This paper extends our Real-Time Maude formalization of the semantics of flat Ptolemy II discreteevent (DE) models to hierarchical models, including modal models. This is a challenging task that requires combining synchronous fixed-point computations with hierarchical structure. The synthesis of a Real-Time Maude verification model from a Ptolemy II DE model, and the formal verification of the ...

In the framework of model-based design formal modelling, verification and simulation of safety-critical systems are supported by several methods and tools. Interfacing these tools often becomes challenging for heterogeneous systems. The FMI standard enables integration of different simulation tools through artefacts called Functional Mockup Units (FMU) [1]. The FMI standard is mainly based on t...

The framework for Dynamic Volume Rendering in Ptolemy II and the issues that arise with it are introduced in this paper. The motivation for volume rendering in Ptolemy II, is for the application of medical imaging. A toolkit for medical imaging was an initial goal of this work. However, the author slowly realized that having a deeper understand of the existing work, Ptolemy II and the API Java ...

Ptolemy is an environment for simulation, prototyping, and software synthesis for heterogeneous systems. It uses modern object-oriented software technology (in C++) to model each subsystem in a natural and efficient manner, and to integrate these subsystems into a whole. The objectives of Ptolemy encompass practically all aspects of designing signal processing and communications systems, rangin...

The Ptolemy software architecture is described in Chapter 1 and shown in Figure 1-2. The Ptolemy kernel provides a basic set of C++ classes and functions used by the rest of Ptolemy, but it does not implement any particular model of computation. Instead, a model of computation is defined by a domain. A domain defines the semantics of the model, but not how the computations are performed. The co...