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Capozzi F.,CNR Institute of Industrial Technologies and Automation | Piro G.,Polytechnic of Bari | Grieco L.A.,Polytechnic of Bari | Boggia G.,Polytechnic of Bari | Camarda P.,Polytechnic of Bari
IEEE Communications Surveys and Tutorials | Year: 2013

Future generation cellular networks are expected to provide ubiquitous broadband access to a continuously growing number of mobile users. In this context, LTE systems represent an important milestone towards the so called 4G cellular networks. A key feature of LTE is the adoption of advanced Radio Resource Management procedures in order to increase the system performance up to the Shannon limit. Packet scheduling mechanisms, in particular, play a fundamental role, because they are responsible for choosing, with fine time and frequency resolutions, how to distribute radio resources among different stations, taking into account channel condition and QoS requirements. This goal should be accomplished by providing, at the same time, an optimal trade-off between spectral efficiency and fairness. In this context, this paper provides an overview on the key issues that arise in the design of a resource allocation algorithm for LTE networks. It is intended for a wide range of readers as it covers the topic from basics to advanced aspects. The downlink channel under frequency division duplex configuration is considered as object of our study, but most of the considerations are valid for other configurations as well. Moreover, a survey on the most recent techniques is reported, including a classification of the different approaches presented in literature. Performance comparisons of the most well-known schemes, with particular focus on QoS provisioning capabilities, are also provided for complementing the described concepts. Thus, this survey would be useful for readers interested in learning the basic concepts before going into the details of a particular scheduling strategy, as well as for researchers aiming at deepening more specific aspects. © 2013 IEEE. Source

Pauwels P.,Ghent University | Terkaj W.,CNR Institute of Industrial Technologies and Automation
Automation in Construction | Year: 2016

An increasing number of information management and information exchange applications in construction industry is relying on semantic web technologies or tools from the Linked Open Data (LOD) domain to support data interoperability, flexible data exchange, distributed data management and the development of reusable tools. These goals tend to be overlapped with the purposes of the Industry Foundation Classes (IFC), which is a standard for the construction industry defined through an EXPRESS schema. A connecting point between semantic web technologies and the IFC standard would be represented by an agreed Web Ontology Language (OWL) ontology for IFC (termed ifcOWL) that allows to (1) keep on using the well-established IFC standard for representing construction data, (2) exploit the enablers of semantic web technologies in terms of data distribution, extensibility of the data model, querying, and reasoning, and (3) re-use general purpose software implementations for data storage, consistency checking and knowledge inference. Therefore, in this paper we will look into existing efforts in obtaining an ifcOWL ontology from the EXPRESS schemas of IFC and analyse which features would be required in a usable and recommendable ifcOWL ontology. In making this analysis, we present our implementations of an EXPRESS-to-OWL converter and the key features of the resulting ifcOWL ontology. © 2015 Elsevier B.V. All rights reserved. Source

Valente A.,CNR Institute of Industrial Technologies and Automation | Carpanzano E.,CNR Institute of Industrial Technologies and Automation
CIRP Annals - Manufacturing Technology | Year: 2011

The proposed work outlines the production system (re)configuration problem from the real-time system automation perspective. A multi-level approach to support the development of adaptive automation systems in reconfigurable manufacturing systems is introduced. Starting from the hardware resources selected to face the production demand, the developed approach enables the identification and modelling of automation tasks, as well as the design and implementation of the distributed self-adaptive control solutions based on IEC 61499. A deeper focus on a dynamic algorithm to schedule automation tasks over time is outlined. Finally, preliminary analyses are illustrated with reference to a robotic cell operating in a pilot assembly line. © 2011 CIRP. Source

Colledani M.,Polytechnic of Milan | Tolio T.,CNR Institute of Industrial Technologies and Automation
CIRP Journal of Manufacturing Science and Technology | Year: 2011

An analytical method for the joint design of quality and production control parameters in unreliable multi-stage lines is proposed in this paper. Specifically, the method optimally sets the sample size, the sampling frequency and the position of the control limits of the quality control charts as well as the number of kanban cards at any production stage, by jointly considering the mutual relations between the controllers. Numerical results compare the solution of this integrated design with the configurations obtained by solving the two problems in isolation with existing techniques. They show that great benefits can be achieved by the proposed integrated design of quality and production control parameters, since it fully captures the interaction between the dynamics of the two controllers. © 2011 CIRP. Source

Brondi C.,CNR Institute of Industrial Technologies and Automation | Carpanzano E.,CNR Institute of Industrial Technologies and Automation
CIRP Journal of Manufacturing Science and Technology | Year: 2011

The development of new methodologies and tools supporting the design and management of eco-effective manufacturing systems represents a major challenge for the emerging sustainable production paradigm. Novel methodologies based on Life Cycle Assessment will be powerful tools to quantify the environmental impacts of factories and manufacturing system operations. The full exploitation of Life Cycle Assessment tools within frameworks for production process development still needs significant research efforts. A modular calculation of Environmental Profiles for a Production Line is proposed as a structured approach. An industrial application is described, with reference to a woodworking production line, outlining the major benefits of the approach. © 2011 CIRP. Source

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