Artículos en Revistas

Permanent URI for this collectionhttp://48.217.138.120/handle/20.500.12272/538

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Author: search.filters.author.Blas, María JuliaStart date: 2022

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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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    Enriching UML statecharts through a metamodel : a model-driven approach for the graphical definition of DEVS atomic models
    (IEEE Latin America Transactions, 2023-01-11) Dalmasso, Fidel; Blas, María Julia; Gonnet, Silvio
    The Discrete Event System Specification (DEVS) formalism provides a set of mathematical elements for modeling time-varying systems. However, when DEVS models are implemented in an executable representation (i.e., using a generalpurpose programming language), some deviation from the formalism is unavoidable. One way to bridge the gap between modeling and simulation theory and practice is to define new artifacts that support both views during the specification. When the specification is supported with a graphical representation, the formalization task is less complex and can be performed by nonexpert modelers. For DEVS atomic models, most common graphical representation is through UML statecharts. In this paper, we present a theoretical and practical metamodel for the definition of atomic models structured following the Classic DEVS with Ports formalization. Such a metamodel is the core of a model-driven approach used to develop a modeling software tool that employs enriched UML statecharts for the graphical representation of the DEVS behavior. In here, the traditional UML statechart representation is enriched with a set of new components with the aim to provide a broad definition of DEVS atomic models. The final software tool is deployed as a plugin for Eclipse Platform.
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    Ontología para la representación de entidades con comportamientos basados en eventos
    (SADIO Electronic Journal of Informatics and Operations Research (EJS), 2022) Blas, María Julia; Gonnet, Silvio; Becker, Pablo; Olsina, Luis
    El modelado de comportamientos dinámicos usando eventos como disparadores del cambio de estado de entidades es un área de interés en Modelado y Simulación (M&S). En este trabajo se presentan los términos, propiedades, relaciones y axiomas de ParticularEventCO (PEventCO) como un modelo semántico basado en la noción de eventos causados por el comportamiento de entidades. Esta ontología se encuentra situada en el nivel “Core” de la arquitectura FCDOntoArch, donde la ontología ThingFO define el nivel fundacional. El principal objetivo es lograr una representación del comportamiento de entidades dinámicas siguiendo un enfoque basado en eventos como complemento de las ontologías ya existentes en FCD-OntoArch. Luego, se detalla la forma en la cual los principales elementos del nivel fundacional han sido redefinidos en PEventCO. Además, se incluye la especificación formal del modelo haciendo uso de ConceptBase, junto con la instanciación de una prueba de concepto tomada del área de M&S.
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    Mapping RDEVSNL-­based Definitions of Constrained Network Models to Routed DEVS Simulation Models
    (2024-03-27) Espertino, Clarisa; Blas, María Julia; Gonnet, Silvio
    The Routed DEVS (RDEVS) formalism has been introduced recently to provide a reasonable formalization for the simulation of routing processes over Discrete Event System Specification (DEVS) models. Due to its novelty, new software tools are required to improve the Modeling and Simulation (MS) tasks related to the RDEVS formalism. This paper presents the mapping between constrained network models obtained from textual specifications of routing processes and RDEVS simulation models implemented in Java. RDEVSNL context­free grammar (previously defined) is used to support the textual specification of a routing process as a constrained network model. Such grammar is based on a metamodel that defines the syntactical elements. This metamodel is used in this paper as a middleware that allows mapping constrained network model concepts with RDEVS simulation models. From such a constrained network model template, RDEVS Java implementations are obtained. The proposal is part of a work­in­progress intended to develop MS software tools for the RDEVS formalism using well­known abstractions to get the computational models through conceptual mapping. Using these tools, modelers can specify simulation models without needing to codify any routing implementation. The main benefits are i) reduction of implementation times and ii) satisfactory simulation model correctness regarding the RDEVS formalism.