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, Maria Julia

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    Using UML and OCL as languages to define DEVS atomic models
    (2020 Winter Simulation Conference, 2020) Blas, Maria Julia; Gonnet, Silvio
    This paper presents a work-in-progress intended to define the foundations for building a representation of DEVS using conceptual modeling languages from information system engineering. We use UML and OCL languages to define a metamodel that conceptualizes atomic DEVS models. Such a representation enhances the DEVS modeling activity providing atomic model definitions as instances of the metamodel developed
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    DEVS-based formalism for the modeling of routing processes
    (2021) Blas, Maria 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.
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    Modeling and simulation framework for quality estimation of web applications through architecture evaluation
    (2020) Blas, Maria Julia; Leone, Horacio; Gonnet, Silvio
    The explosive growth of the cloud computing industry in recent years has paying attention to problems related to software services quality. Given that quality models serve as frameworks for quality evaluation, this paper proposes a modeling and simulation framework that measures properties derived from ISO/IEC 25010 quality model as main quality concerns of cloud computing applications. The simulation models are obtained by translating the architectural design to an equivalent functional description that, with aims to obtain the quality evaluation, explores all possible component states. Moreover, the framework automatically builds the simulation models using a set of predefned behaviors as components descriptors. Such models are combined with an experimental frame in a simulation scenario that helps to estimate quality employing the performance of the architectural design. Therefore the simulation process is hidden to software architects, providing an evaluation process able to be executed by any developer without knowledge of discrete-event simulation. Two general architectures are used as case study in order to show how works the modeling and simulation framework.
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    Desarrollo de un modelo integral para el estudio de la calidad en aplicaciones web por medio de simulación
    (2021) Blas, Maria Julia; Leone, Horacio; Gonnet, Silvio
    El estudio de los entornos de computación en la nube se divide en dos áreas principales: infraestructura y aplicación. A nivel de aplicación, los arquitectos de software especifican los productos siguiendo el modelo de servicios de software. Este trabajo propone un modelo integral basado en simulación que captura la información de las arquitecturas de software de aplicaciones web a fin de evaluar cuantitativamente aspectos de calidad en etapas tempranas de desarrollo. La propuesta integra un modelo semántico para la definición de las propiedades de calidad con una herramienta de modelado basada en patrones de diseño. Los modelos de simulación son generados en base a la combinación de ambos elementos. Estos modelos son especificados utilizando una adaptación del formalismo de simulación Discrete Event System Specification denominada Routed DEVS, la cual ha sido diseñada para abordar el estudio de problemas de ruteo.
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    Nuevos aportes de las tecnologías de información para el desarrollo de simulación distribuida
    (2020) Sarli, Juan Leonardo; Blas, Maria Julia; Gonnet, Silvio
    Se entiende por simulación al proceso por medio del cual se representa, reproduce o imita el comportamiento observable de un proceso o sistema real a lo largo del tiempo y el espacio. La simulación distribuida tiene la capacidad de acelerar la ejecución de un único modelo, vincular y reutilizar múltiples modelos para simular modelos más grandes y acelerar la ejecución de etapas de experimentación. En este contexto, la construcción de simulaciones distribuidas ha mejorado en los últimos años gracias al surgimiento de nuevas tecnologías de la información. En este artículo se describen los principios, modos de trabajo y enfoques de administración de tiempo asociados a esta técnica junto con las herramientas de software que, en la actualidad, brindan soporte a su aplicación. Además, se presenta una revisión bibliográfica que evidencia el crecimiento (y la importancia) de su uso como técnica de estudio en diferentes dominios