Facultad Regional Santa Fe

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    Enhancing routed DEVS models with event tracking
    (Journal of the Brazilian Computer Society, 2025-06-17) Blas, María Julia; Toniolo, Mateo; Gonnet, Silvio
    The Routed Discrete Event System Specification (RDEVS) is a modular and hierarchical Modeling and Simulation (M&S) formalism based on the Discrete Event System Specification (DEVS) formalism that provides a set of design models for dealing with routing problems over DEVS. At the formal level, RDEVS models (as DEVS models themselves) are defined mathematically. However, software implementations of both formalisms are based on an object-oriented paradigm. Furthermore, at the implementation design level, the RDEVS formalism is represented by a conceptual model that uses DEVS simulators as execution engines. Even when RDEVS models can be executed with DEVS simulators, the resulting data (obtained as execution outputs) remains DEVS-based, restricting the study of event flows between models influenced by routing policies. This paper shows how the RDEVS formalism design was enhanced to include event tracking in the models without altering their expected behavior during simulation. Such an improvement is based on adding new features to existing RDEVS components. These features are defined as trackers, which are responsible for getting structured data from events exchanged during RDEVS executions. The proposed solution employs the Decorator pattern as a software engineering option to achieve the required goal. It was deployed as a Java package attached to the RDEVS library, devoted to collecting structured event flow data using JavaScript Object Notation (JSON). The results highlight the modeling benefits of adding event tracking to the original capabilities of the RDEVS formalism. For the M&S community, the novel contribution is an advance in understanding how best modeling practices of software engineering can be used to enhance their software tools in general and the RDEVS formalism in particular.
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    Una gramática libre de contexto para la especificación de modelos conceptuales
    (JIT, 2023-09-04) Meichtry Regner, Victoria Elizabeth
    Este trabajo tiene como finalidad la construcción de una herramienta que de soporte a la definición por etapas de un modelo de simulación. El objetivo es especificar una sintaxis que permita la definición de un modelo conceptual a partir de la abstracción de una situación del mundo real. Para esto, se establece una gramática que permite reconocer oraciones válidas y, a partir de ello, se permita la visualización de un conjunto de relaciones entre las entidades del modelo a través de un diagrama de clases. Para el desarrollo de cada etapa se utilizan como soporte, primeramente, ANTLR4 para definir reglas sintácticas con el fin de reconocer sentencias válidas. Además, se utilizó USE para realizar un diagrama de clases con el propósito de definir clases y establecer relaciones entre ellas. Por último, a través del lenguaje de programación Java, se pretende desarrollar las clases con sus relaciones propuestas en el diagrama.
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    DEVS-based formalism for the modeling of routing processes
    (2021) Blas, María Julia; Leone, Horacio; Gonnet, Silvio
    The Discrete Event System Specification (DEVS) is a modular and hierarchical Modeling and Simulation (M&S) formalism based on systems theory that provides a general methodology for the construction of reusable models. Well-defined M&S structures have a positive impact when building simulation models because they can be applied systematically. However, even when DEVS can be used to model routing situations, the structures that emerge from this kind of problem are significant due to the handling of the flow of events. Often, the modeler ends with a lot of simulation models that refer to variants of the same component. The goal of this paper is to analyze the routing process domain from a conceptual modeling perspective through the use of a new DEVS extension called Routed DEVS (RDEVS). The RDEVS formalism is conceptually defined as a subclass of DEVS that manages a set of identified events inside a model network where each node combines a behavioral description with a routing policy. In particular, we study the modeling effort required to solve the M&S of routing problems scenarios employing a comparison between RDEVS modeling solutions and DEVS modeling strategies. Such a comparison is based on measures that promote the capture of the behavioral complexity of the final models. The results obtained highlight the modeling benefits of the RDEVS formalism as a constructor of routing processes. The proposed solution reduces the modeling effort involved in DEVS by specifying the event routing process directly in the RDEVS models using design patterns. The novel contribution is an advance in the understanding of how DEVS as a system modeling formalism supports best practices of software engineering in general and conceptual modeling in particular. The reusability and flexibility of the final simulation models, along with designs with low coupling and high cohesion are the main benefits of the proposal that improve the M&S task applying a conceptual modeling perspective.