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Physical fitness predicts adiposity longitudinal changes over childhood and ado...

Rodrigues, Luis Paulo; Leitão, Raquel; Lopes, Vítor P.

Objectives: The purpose of this study was to examine the influence of physical fitness (PF) on the development of subcutaneous adipose tissue in children followed longitudinally over a 9 year period ranging from childhood to adolescence. Design: This longitudinal study followed 518 healthy participants (262 boys, 256 girls) over a 9-year period ranging from childhood (age 6) to adolescence (age 15). Adiposity (...

Data: 2013   |   Origem: Biblioteca Digital do IPB

Process Optimization of Service-Oriented Automation Devices Based on Petri Nets

J. Marco Mendes; Paulo Leitão; Francisco Restivo; Armando W. Colombo

This paper introduces a novel method for the specification and selection of criteria-weighted operation modes for the orchestration of services in industrial automation using Petri nets. The objective is to provide to the internal decision support system of a service-oriented automation device or of another applicable computational system the capability to select the best path in a Petri net orchestration model...


Composition of Petri Nets Models in Service-oriented Industrial Automation

J. Marco Mendes; Paulo Leitão; Francisco Restivo; Armando W. Colombo

In service-oriented systems, composition of services is required to build new, distributed and more complex services, based on the logic behavior of individual ones. This paper discusses the formal composition of Petri nets models used for the process description and control in service-oriented automation systems. The proposed approach considers two forms for the composition of services, notably the offline com...


Decision support system for Petri nets enabled automation components

João Pinto; João Marco de Melo Pereira Mendes; Paulo Leitão; Armando W. Colombo; Axel Bepperling; Francisco José de Oliveira Restivo


Software methodologies for the engineering of service-oriented industrial autom...

João Marco de Melo Pereira Mendes; Axel Bepperling; João Pinto; Paulo Leitão; Francisco José de Oliveira Restivo; Armando W. Colombo


Customizable Service-oriented Petri Net Controllers

J. Marco Mendes; Francisco Restivo; Paulo Leitao; Armando W. Colombo

In industrial automation, service-orientation is a relatively new and ascending concept and thus, concrete integrated methodologies are missing to accomplish the required development tasks. A suitable approach is to use the powerful set of features that Petri nets formalism provides for such dynamic systems. This paper presents a token game template that is part of the open methodology for the development of cu...


Distributed control patterns using device profile for web services

João Marco de Melo Pereira Mendes; Alexandre Rodrigues; Paulo Leitão; Armando W. Colombo; Francisco José de Oliveira Restivo

Automation systems are changing from the centriccontrolled approach to a more flexible and autonomous behavior. The contribution to this philosophy comes from several technologies, including service-oriented concepts. This work focus on some open points of enhanced communication and control patterns and presents it in form of a multi-use communication module. For the development of such systems, the SOA4D imple...


Implementation of a holonic control system in a flexible manufacturing system

Paulo Leitão; Francisco José de Oliveira Restivo

Answering to the need to have innovative manufacturing control systems tailored to the current economical, technological, and customer trends, where dynamic and volatile environments prevail, adaptive holonic control architecture (ADACOR) aims to increase the agility and reconfigurability of the production system, contributing for the improvement of the enterprise competitiveness when it works in dynamic and vo...


High-Level Petri Nets Control Modules for Service-Oriented Devices: A Case Study

João Marco de Melo Pereira Mendes; Paulo Leitão; Armando Walter Colombo; Francisco José de Oliveira Restivo

A solution for the control of service-oriented devices based on modular and special adapted High-Level Petri Nets (HLPN) process description of intra- and inter-control activities is presented. Each component of the architecture may be implemented independently and differently. The only requirement is that it should share its functions as services and obey to the protocols of communication and processes. The co...


A holonic approach to dynamic manufacturing scheduling

Paulo Leitão; Francisco José de Oliveira Restivo

Manufacturing scheduling is a complex combinatorial problem, particularly in distributed and dynamic environments. This paper presents a holonic approach to manufacturing scheduling, where the scheduling functions are distributed by several entities, combining their calculation power and local optimization capability. In this scheduling and control approach, the objective is to achieve fast and dynamic re-sched...


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    Financiadores do RCAAP

Fundação para a Ciência e a Tecnologia Universidade do Minho   Governo Português Ministério da Educação e Ciência Programa Operacional da Sociedade do Conhecimento União Europeia