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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Data Sharing And Access With A Corba Data Distribution Service ImplementationDursun, Mustafa 01 September 2006 (has links) (PDF)
Data Distribution Service (DDS) specification defines an API for Data-Centric Publish-Subscribe (DCPS) model to achieve efficient data distribution in distributed computing environments. Lack of definition of interoperability architecture in DDS specification obstructs data distribution between different and heterogeneous DDS implementations. In this thesis, DDS is implemented as a CORBA service to achieve interoperability and a QoS policy is proposed for faster data distribution with CORBA features.
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Data Distribution Service for Industrial AutomationYang, Jinsong January 2012 (has links)
In industrial automation systems, there is usually large volume of data which needs to be delivered to right places at the right time. In addition, large number of nodes in the automation systems are usually distributed which increases the complexity that there needs to be more point-to-point Ethernet-connections in the network. Hence, it is necessary to apply data-centric design and reduce the connection complexity. Data Distributed Service for Real-Time Systems (DDS) is a data-centric middleware specification adopted by Object Management Group (OMG). It uses the Real-Time Publish-Subscribe protocol as its wiring protocol and targets for mission- and business-critical systems. The IEC 61499 Standard defines an open architecture for the next generation of distributed control and automation systems. This thesis presents the structure and key features of DDS and builds a model of real-time distributed system based on the IEC 61499 Standard. Then a performance evaluation of the DDS communication based on this model is carried out. The traditional socket-based communication is also evaluated to act as a reference for the DDS communication. The results of the evaluation mostly show that DDS is considered as a good solution to reduce the complexity of the Ethernet connections in distributed systems and can be applied to some classes of industrial automation systems.
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Integrating Data Distribution Service in an Existing Software Architecture: Evaluation of the performance with different Quality of Service configurationsDomanos, Kyriakos January 2020 (has links)
The Data Distribution Service (DDS) is a flexible, decentralized, peer-to-peer communication middle-ware. This thesis presents a performance analysis of the DDS usage in the Toyota Smartness platform that is used in Toyota’s Autonomous Guided Vehicles (AGVs). The purpose is to find if DDS is suitable for internal communication between modules that reside within the Smartness platform and for external communication between AGVs that are connected in the same network. An introduction to the main concepts of DDS and the Toyota Smartness platform architecture is given together with a presentation of some earlier research that has been done in DDS. A number of different approaches of how DDS can be integrated to the Smartness platform are explored and a set of different configurations that DDS provides are evaluated. The tests that were performed in order to evaluate the usage of DDS are described in detail and the results that were collected are presented, compared and discussed. The advantages and disadvantages of using DDS are listed, and some ideas for future work are proposed.
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A Framework for Interoperability on the United States Electric Grid InfrastructureLaval, Stuart 01 January 2015 (has links)
Historically, the United States (US) electric grid has been a stable one-way power delivery infrastructure that supplies centrally-generated electricity to its predictably consuming demand. However, the US electric grid is now undergoing a huge transformation from a simple and static system to a complex and dynamic network, which is starting to interconnect intermittent distributed energy resources (DERs), portable electric vehicles (EVs), and load-altering home automation devices, that create bidirectional power flow or stochastic load behavior. In order for this grid of the future to effectively embrace the high penetration of these disruptive and fast-responding digital technologies without compromising its safety, reliability, and affordability, plug-and-play interoperability within the field area network must be enabled between operational technology (OT), information technology (IT), and telecommunication assets in order to seamlessly and securely integrate into the electric utility's operations and planning systems in a modular, flexible, and scalable fashion. This research proposes a potential approach to simplifying the translation and contextualization of operational data on the electric grid without being routed to the utility datacenter for a control decision. This methodology integrates modern software technology from other industries, along with utility industry-standard semantic models, to overcome information siloes and enable interoperability. By leveraging industrial engineering tools, a framework is also developed to help devise a reference architecture and use-case application process that is applied and validated at a US electric utility.
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Propuesta de arquitectura distribuida de control inteligente basada en políticas de calidad de servicioPoza Luján, José Luis 10 February 2012 (has links)
La tesis se enmarca en el estudio de las arquitecturas inteligentes de control distribuido y de los sistemas de comunicaciones empleados, más concretamente el trabajo se centra en la optimización del sistema de control por medio de la evaluación del rendimiento en el middleware a través de los parámetros de calidad de servicio y de la optimización del control empleando políticas de calidad de servicio.
El principal objetivo de este trabajo ha sido estudiar, diseñar, desarrollar y evaluar una arquitectura de control distribuido, basándose en el estándar de comunicaciones Data-Distribution Service for Real-Time Systems (DDS) propuesto por la organización Object Management Group (OMG).
Como aportación principal de la tesis se propone el diseño de una arquitectura distribuida de control inteligente que de soporte a la QoS, tanto en la medición por medio de los parámetros, como en la gestión por medio de las políticas de QoS. Las políticas deben permitir la variación de las características de la comunicación en función de los requisitos de control, expresados estos últimos por medio de los parámetros de QoC. A la arquitectura desarrollada se le ha llamado FSACtrl.
Para determinar los requisitos de la arquitectura FSACtrl, se han estudiado las revisiones de los autores más relevantes acerca de las características más destacadas de las arquitecturas distribuidas de sistemas de control. A partir de estas características se han diseñado los elementos de la arquitectura FSACtrl. Los elementos que dan soporte a las comunicaciones se han basado en los del estándar DDS de la OMG, mientras que los elementos de control se han basado en el estándar Sensor Web Enablement (SWE) del Open Geospatial Consortium (OGC).
Para la validación de la arquitectura se ha implementado un entorno de diseño y simulación del control. / Poza Luján, JL. (2012). Propuesta de arquitectura distribuida de control inteligente basada en políticas de calidad de servicio [Tesis doctoral]. Editorial Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/14674
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