Recursos de colección

Repositório Comum (40.364 recursos)

É um repositório para instituições de ensino e investigação produtoras de literatura científica cuja dimensão ainda não justifica a criação de um repositório próprio. Permite integrar instituições, grupos ou indivíduos na infra-estrutura do projecto, nomeadamente através das pesquisas do Portal RCAAP e da B-On.

Mostrando recursos 1 - 20 de 65

  1. Spy Walker: A Convenient Way to Assess Gait in Walker Assistive Devices

    Viegas, Vítor; Pereira, José Dias; Postolache, Octavian; Girão, Pedro Silva
    Trabalho apresentado em 2018 IEEE International Instrumentation and Measurement Technology Conference, 14-17 maio 2018, Houston, TX, USA

  2. Teamwork Evaluation with a Microworld Platform

    Sapateiro, Cláudio; Antunes, Pedro; Enwereuzo, Ijeoma; Johnstone, David; Pino, José A.
    Trabalho apresentado em IEEE 20th International Conference on Computer Supported Cooperative Work in Design,4-6 maio 2016, Nanchang, China

  3. Internal Banking Auditing: From Conceptual Proposal to Technological Aids Development

    Constantino, Gudilak; Sapateiro, Cláudio
    Trabalho apresentado em CENTERIS 2016 - Conference on ENTERprise Information Systems, outibro 2016, Porto, Portugal

  4. Integrating Decision-Making Support in Geocollaboration Tools

    Antunes, Pedro; Zurita, Gustavo; Baloian, Nelson; Sapateiro, Cláudio
    info:eu-repo/semantics/publishedVersion

  5. Gathering big data for teamwork evaluation with microworlds

    Sapateiro, Cláudio; Antunes, Pedro; Johnstone, David; Pino, José
    info:eu-repo/semantics/publishedVersion

  6. Características das Cidades Inteligentes e da Internet das Coisas

    Júnior, Laércio
    N/A

  7. A Piezoelectric Device for Measurement and Power Harvesting Applications

    Alves, M.; Pereira, José Dias; Fonseca, J. M.
    Com o apoio RAADRI.

  8. Open Controller for Distributed Instrumentation Systems

    Viegas, Vítor; Girão, P. Silva; Pereira, José Dias
    The paper presents a controller designed to be highly interoperable in the context of distributed instrumentation systems. Interoperability is achieved by adopting strong standards – the IEEE 1451.1 Std to be more precise – and by using cross-platform, manufacturer-independent technologies such as Web Services. The 1451.1 Std contributes with its information model to represent data and organize functionalities through a well-defined hierarchy of objects. Web Services are used to implement both communication models, the client/server model for one-to-one communications, and the publish/subscribe model for one-to-many communications. Being supported by all the major software companies around the world, Web Services have the...

  9. Service-Oriented Distributed Measurement and Control Systems: A Case Study

    Viegas, Vítor; Girão, P. Silva; Pereira, José Dias
    The paper presents a Distributed Measurement and Control System (DMCS) applied to a physical process equipped with all the instrumentation needed to run control loops for temperature, level, flow and pressure, quantities widely found in the process industry. The system is supported by a service-oriented middleware platform based on the IEEE 1451.1 std and the Windows Communication Foundation (WCF). Tests were made to evaluate the performance of the system in terms of sampling frequency and behavior of control loops. The methodology of each experiment is described, results are analyzed and conclusions are extracted.

  10. Using a Commercial Framework to Implement and Enhance the IEEE 1451.1 Standard

    Viegas, Vítor; Pereira, José Dias; Girão, P. Silva
    In 1999, the 1451.1 Std was published defining a common object model and interface specification to develop open, multi-vendor distributed measurement and control systems. However, despite the well-known advantages of the model, few have been the initiatives to implement it. In this paper we describe the implementation of a NCAP – Network Capable Application Processor, in a well-known and well-proven infrastructure: the Microsoft .NET Framework. The choice of a commercial framework was part of our strategy: to take advantage of several “of the shelf” technologies and adapt them to produce a NCAP prototype, called NCAP/XML. In addition, a solution to...

  11. IEEE 1451.1 Standard and XML Web Services: a Powerful Combination to Build Distributed Measurement and Control Systems

    Viegas, Vítor; Pereira, José Dias; Girão, P. Silva
    In 2005, we presented the NCAP/XML, a prototype of NCAP (Network Capable Application Processor) that runs under the .NET Framework and makes available its functionality through a set of Web Services using XML (eXtended Markup Language). Giving continuity to this project, it is time to explain how to use the NCAP/XML to build a Distributed Measurement and Control System (DMCS) compliant with the 1451.1 Std. This paper is divided in two main parts: in the first part, we present the new software architecture of NCAP/XML (which suffered some changes since the first version), and secondly, we describe the network configuration...

  12. Next Generation Application Processor Based on the IEEE 1451.1 Standard and Web Services

    Viegas, Vítor; Pereira, José Dias; Girão, P. Silva
    Over the last decade, the 1451.1 Std has been a reference model to develop smart and open distributed measurement and control systems. Now, that the 1451.1 Std is about to be revised, there is the opportunity to enrich it with emergent and successful technologies as is the case of Web Services. Following this idea, we present a prototype of Network Capable Application Processor (NCAP) that runs on the .NET Framework and exposes its functionality through a set of Web Services. The prototype takes advantage of three key technologies: (i) the abstraction layer proposed by the 1451.1 Std; (ii) the interoperability provided...

  13. Performance Evaluation of a Web-Service-Based DMCS

    Viegas, Vítor; Girão, P. Silva; Pereira, José Dias
    The paper describes a set of experiments conducted on a service-oriented middleware infrastructure in order to evaluate its performance and applicability in the context of Distributed Measurement and Control Systems (DMCS). The infrastructure, entirely based on Web Services, was built using the Windows Communication Foundation (WCF), a software package released by Microsoft to develop distributed applications. The experiments were performed on a real plant equipped with all the instrumentation needed to run control loops for pressure, level, flow and temperature, quantities widely found in the process industry. The work focus on measuring the time delays associated with control loops and...

  14. Foundation fieldbus : from theory to practice

    Viegas, Vítor; Pereira, José Dias
    This paper describes the main characteristics of the Foundation Fieldbus (FF) technology considering both communication levels, namely H1 and H2, which have bit rates of 31.25 K and 100 Mbit/s, respectively. Several details about the physical layer, communication stack and user layer will be highlighted. Topics related with the configuration of instruments, as well as the design and implementation of supervision software, based on a LabVIEW interface, will be presented. A pilot plant that includes temperature, pressure, level and flow variables will be used to test and validate the capabilities of FF systems. Experimental results will be analyzed, their meaning...

  15. Foundation Fieldbus: Exemplo de Aplicação

    Viegas, Vítor; Pereira, José Dias
    info:eu-repo/semantics/publishedVersion

  16. Foundation Fieldbus: Um Resumo Técnico

    Viegas, Vítor; Pereira, José Dias
    info:eu-repo/semantics/publishedVersion

  17. Stability of Discrete Systems Controlled in the Presence ofIntermittent Sensor Faults

    Dionísio, Rui Vilela; Lemos, João M.
    info:eu-repo/semantics/publishedVersion

  18. Stability in the Pseudo-state Formalism of Discrete Systems Controlled in the Presence of Intermittent Sensor Faults

    Dionísio, Rui Vilela; Lemos, João M.
    Trabalho apresentado em IFAC Workshop on Adaptation and Learning in Control and Signal Processing, 26-28 de Agosto de 2010, Antalya, Turquia.

  19. Control of Neuromuscular Blockade in the Presence of Sensor Faults

    Lemos, João M.; Magalhães, Hugo; Mendonça, Teresa; Dionísio, Rui Vilela
    The problem of embedding sensor fault tolerance infeedback control of neuromuscular blockade is considered. Fortackling interruptions of feedback measurements, a structurebased upon Bayesian inference as well as a predictive filter is pro-posed. This algorithm is general and can be applied to differentsituations. Here, it is incorporated in an adaptive automatic systemfor feedback control of neuromuscular blockade using continuousinfusion of muscle relaxants. A significant contribution consistsin the experimental clinical testing of the algorithm in patientsundergoing surgery.

  20. Computing Parity Space Residuals’ Computational Form With MIMO Predictive Models

    Dionísio, Rui Vilela; Lemos, João M.
    Trabalho apresentado em 12th Mediterranean Conference on Control and Automation MED’04, 6-9 de Junho de 2004, Kusadasi, Turquia.

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