Artículos en Revistas
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Item Evaluación de los atributos del sistema de registro electrónico de tuberculosis en Argentina según metodología del CDC en 2019-2023(Revista Argentina de Salud Pública, 2024-11-29) Mordini, Natalia Soledad; Stoffel, Carina Sonia; Fernández, Hugo; Yessi, Leyla Yamile; Gonnet, Silvio; Mangold, Anabela; Rasse, Ignacio; Díaz, Yamila; Armando, GustavoINTRODUCCION: El registro de la información es un componente fundamental en la atención de pacientes con tuberculosis (TB) y el control de la enfermedad. El objetivo fue evaluar atributos del sistema nacional de notificación de TB en Argentina según la metodología propuesta por los Centros para el Control y la Prevención de Enfermedades (CDC) de EE. UU. MÉTODOS: Se construyeron indicadores para evaluar la calidad, oportunidad y valor predictivo positivo (VPP), trabajando con la información registrada para todos los casos de TB notificados durante 2019-2022 en el Sistema Nacional de Vigilancia de la Salud (SNVS). Se realizaron encuestas para evaluar la percepción de usuarios del sistema respecto a su simplicidad, flexibilidad, aceptabilidad, utilidad y estabilidad en establecimientos de salud en las ciudades de Salta y Santa Fe y localidades del Área Metropolitana de Buenos Aires (AMBA), y se relevó información disponible en los establecimientos durante 2023 para evaluar la sensibilidad. RESULTADOS: La calidad de la información registrada no cumplió con los requisitos para alcanzar los estándares propuestos. El VPP para los casos de TB fue del 89,7 %. La calidad del sistema fue evaluada como buena; la simplicidad, flexibilidad, estabilidad y aceptabilidad, como promedio. La sensibilidad fue del 97,7 %. DISCUSIÓN: El sistema electrónico nacional de registro de TB es una herramienta valiosa en la vigilancia, pero presenta aspectos a mejorar en su diseño y en el uso por parte de los usuarios.Item Enhancing routed DEVS models with event tracking(Journal of the Brazilian Computer Society, 2025-06-17) Blas, María Julia; Toniolo, Mateo; Gonnet, SilvioThe 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.Item Metamodel-based formalization of DEVS atomic models(Simulation, 2021-09-14) Blas, María Julia; Gonnet, SilvioThe Discrete-Event System Specification (DEVS) formalism is a modeling formalism based on systems theory that provides a general methodology for hierarchical construction of reusable models in a modular way. When concrete DEVS models are developed using programming languages, it is difficult to ensure they conform to their formal model. Hence, building an implementation of formal models in a way that ensures DEVS formalism correctness is not easy. In this paper, we improve the interplay of abstraction (i.e., formal specification) and concreteness (i.e., programming code implementation) in advancing the theory and practice of DEVS using a specific-designed metamodel. The main contribution is a novel conceptualization of classic DEVS with ports founded on existing approaches but, that also includes new improved elements related to the definition of atomic models. That is, our metamodel includes all the concepts and relationships needed to define the formal specification of DEVS atomic models. This allows us to define instances of our conceptualization that comply with the DEVS formal specification. To instantiate our metamodel, we propose a computer-aided environment that has been developed using the Eclipse Modeling Project. As an example, we show how our metamodel can be used to define the classic “switch” model. As a conclusion, we discuss how the final metamodel can be used to support interoperability with DEVS simulation tools.Item The role of ontologies in Smart Contracts : a systematic literature review(Journal of Industrial Information Integration, 2024-07) Alvarado Domínguez, Johnny; Gonnet, Silvio; Vegetti, MarcelaThe aim of this systematic literature review is to provide a comprehensive understanding of how ontologies address current Smart Contract challenges, identify application scenarios, and present tools and technologies associated with their use. This systematic literature review (SLR), following Kitchenham's methodology, analyses peerreviewed articles from 2015 to August 2022 from databases such as Scopus, IEEE, Science Direct, Springer Link and ACM. Of the 501 publications identified, 21 are selected for in-depth review based on inclusion, exclusion and quality assessment criteria. The results of this SLR show that ontologies provide solutions to the challenges faced by Smart Contracts mainly at the creation stage. They allow the terms of the contract and the roles of the parties to be defined. Ontologies also enable the development of Smart Contract templates. This facilitates their use by people without technical programming expertise. Despite these potential solutions to the challenges that Smart Contracts face throughout their lifecycle, they lack verification. This increases the vulnerabilities to which Smart Contracts are exposed. Developing validation and verification tools could facilitate using ontologies to create Smart Contracts for different real-world cases.Item 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, SilvioThe 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.Item 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, LuisEl 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.Item Mapping RDEVSNL-based Definitions of Constrained Network Models to Routed DEVS Simulation Models(2024-03-27) Espertino, Clarisa; Blas, María Julia; Gonnet, SilvioThe 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.Item Using UML and OCL as languages to define DEVS atomic models(2020 Winter Simulation Conference, 2020) Blas, María Julia; Gonnet, SilvioThis 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.Item DEVS-based formalism for the modeling of routing processes(2021) Blas, María Julia; Leone, Horacio; Gonnet, SilvioThe 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.Item Modeling and simulation framework for quality estimation of web applications through architecture evaluation(2020) Blas, María Julia; Leone, Horacio; Gonnet, SilvioThe 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.