CESE - Indexed Articles in Conferences

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    Scheduling in the Textile Industry
    ( 2007) Ana Santos ; José Soeiro Ferreira
    The Textile Industry faces specific and critical scheduling difficulties along with the planning and control of production in the weaving sections. Generally the textiles are produced to order and the whole production must observe the times of delivery agreed with the clients. Therefore it is necessary to allocate the existing looms to the processing of tasks, the fabric types to be produced. The case of one of the largest Portuguese textile companies (manufacturing mainly for exportation) is presented. The situation involves more than 100 looms with different characteristics. The parallel machines scheduling problems are complex due to various reasons such as: specific sets of fabric can only be produced on certain looms, depending on the equipment - a specific warp chain; there are limits on the length of the threads to wind round the cylinders of the looms - setups must be taken into account; a certain loom may used to produce various fabric types, but then its configuration must be changed, another (external) setup occurs due to the replacement of a warp chain, which may take at least 5 hours, and so on. The problems were modelled as Combinatorial Optimisation and several criteria were discussed. Feasible solutions were generated to test all the conditions and restrictions and to facilitate the discussion with the technicians of the company. The optimisation procedure is based on Tabu Search - the procedure will be described. Computational results will also be presente
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    High performance collaborative networks: a realistic innovation or just an academic desire?
    ( 2007) Jorge Pinho de Sousa ; Rui Patrício ; Luís Carneiro ; António Lucas Soares ; Adília Isabel Alves ; Ricardo Madureira
    This paper presents the preliminary findings of a research project aiming at the definition of the conditions required for the creation and management of high-performance collaborative business networks in Northern Portugal. Given the industrial context of the region the emergence of such networks would be innovative in itself. The project adopted a multiplecase study research strategy, based on data from 40 semi-structured interviews. The preliminary results of the study include: 1) operational definitions based on an extensive literature review; 2) a conceptual framework for the analysis of high-performance collaborative networks; and 3) recommendations for the creation and on-going management of such networks.
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    Interoperability in Collaborative Networks: An innovative approach for the shoe up-stream business segment
    ( 2007) Claudia Chituc ; César Toscano ; Américo Azevedo
    The development of information and communication technologies determined enterprises to adapt their way of undertaking business, from traditional practices to e-business. In this context, achieving seamless interoperability among heterogeneous entities becomes a critical issue. The goal of this article is to present an innovative two-layered operational infrastructure aiming at achieving seamless interoperability in shoe manufacturing up-stream segment, developed within the scope of CEC-made-shoe European Integrated Project.
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    Ontology Engineering in Virtual Breeding Environments
    ( 2007) Dora Pereira ; António Lucas Soares ; Hugo Miguel Ferreira
    This paper proposes a new method for managing the use of ontologies in the context of a Virtual Breeding Environment. This research work focus is on the dissolution phase of a Virtual Enterprise or Collaborative Network, where ontology segmentation techniques are user to enrich the VBE's ontology library. Firstly, an overview of the process of ontology composition and decomposition is given and the ontology library system adopted described. Then, the ontologies' ranking and classification method is described, explaining a set of metrics inspired in social network approaches. Finally, the results of preliminary tests are discussed.
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    USING CONCEPT MAPS FOR ONTOLOGY DEVELOPMENT: A CASE IN THE WORK ORGANIZATION DOMAIN
    ( 2008) António Lucas Soares ; Cristovão Sousa
    Ontologies are a technological key factor regarding the knowledge management domain. This paper presents a graphical-based knowledge representation approach using concept maps towards creating a formal work organization ontology, which was translated into a Content Management System in order to manage the work design information. Some aspects related with the advantages of visual approaches for collaborative development of ontologies are discussed.
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    Short-term Semantic Consensus: Toward Agile Ontology Specification for Collaborative Networks
    ( 2009) Carla Pereira ; Cristovão Sousa ; António Lucas Soares
    This paper presents our method to support the collaborative conceptualisation process focusing our strategy for building consensus in the context of collaborative networks. This new strategy comes from the application of the results and recommendations obtained in an experimental evaluation performed in the scope of a large European project in the area of industrial engineering. The usage of our strategy and the collaborative platform supporting semantic consensus building in the scope of the European research project H-Know is described.
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    Short-term semantic consensus: towards agile ontology specification for collaborative networks
    ( 2009) Carla Pereira ; Cristovão Sousa ; António Lucas Soares
    This paper presents our method to support the collaborative conceptualisation process focusing our strategy for building consensus in the context of collaborative networks. This new strategy comes from the application of the results and recommendations obtained in an experimental evaluation performed in the scope of a large European project in the area of industrial engineering. The usage of our strategy and the collaborative platform supporting semantic consensus building in the scope of the European research project H-Know is described.
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    A socio-semantic approach to collaborative domain conceptualization
    ( 2009) Carla Pereira ; Cristovão Sousa ; António Lucas Soares
    Current knowledge about the early phases of ontology construction is insufficient to support methods and techniques for a collaborative construction of a conceptualization. Following an approach inspired in cognitive semantics, the application and extension of the Conceptual Blending Theory (CBT) to the realm of collaborative semantic tools is proposed. A formal framework is presented together with some examples in the collaborative networks context. A collaborative semantic architecture is presented. This architecture supports the two components of the proposed method: collective conceptualization and consensus reaching.
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    Optimização de Fluxos Inbound num TIER2 da Indústria Automóvel
    ( 2009) Lia Coelho Oliveira ; Manuel C. Figueiredo ; Rui M. Lima
    Na actualidade, as organizações industriais direccionam cada vez mais esforços para o controlo e redução de custos como forma de responder à crescente competitividade dos mercados. Este trabalho é direccionado para a redução dos custos logísticos, mais concretamente apresenta um modelo que pretende reduzir os custos associados à recolha de matérias-primas (Fluxos Inbound) numa empresa TIER2 da indústria automóvel. A redução destes custos torna o preço do produto final mais apetecível aos olhos do consumidor. O trabalho desenvolvido pretende dar um contributo inovador no âmbito desta área de investigação, propondo um modelo que permite construir circuitos de recolha da matéria-prima e avaliar a sua eficiência. No âmbito deste estudo analisaramse alguns algoritmos de optimização de rotas de veículos que serviram de base à construção de um sistema de apoio à elaboração das rotas.
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    Creativity, Soft Methods and Metaheuristics
    ( 2009) José Soeiro Ferreira
    Some ideas, methods and tools of Creativity and Soft Methods, in connection with Metaheuristics, will be presented. The correspondent work, still going on, investigates the advantages and the utilization of creative thinking and soft Operational Research (soft OR) to resolve difficult Optimization problems and to evaluate and compare dissimilar approaches based on Metaheuristics (Mh). We believe it constitutes an innovative challenge by proposing to combine, articulate and merge diverse procedures and techniques, from different areas. Relevance, power and success of Mh are well-known for decades. But open questions are still around: the choice of a Mh? In the presence of a concrete optimisation problem - which 'effective, efficient' Mh (able to produce an 'optimal'/acceptable solution), at the cost of 'reasonable' computing time, should be selected? And after making a selection (how to do it?), there is no universal way to improve it, to elect adequate strategies or to tune its parameters. The choice of a 'good' Mh and the adjustment of the correspondent parameters suggest, or call upon innovative ideas and tools, eventually out of the specific area. Obviously, expertise and experience of the users are of great value.
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    A Socio-Semantic Approach to the Conceptualization of domains, Processes and Tasks in Large Projects
    ( 2009) Carla Pereira ; Cristovão Sousa ; António Lucas Soares
    A case study involving a new method to support the collaborative construction of semantic artefacts in an inter-organizational context is described. The method aims at being applied, in particular, in the early phases of ontology development. We share the view that the development of semantic artefacts in collaborative networks of organizations should be based on a continuous construction of meaning, rather than pursuing the delivery of highly formalized acconts of domains. For that, our research is directed to the application of cognitive semantics results, specifically by developing and extending the Conceptual Blending Theroy to cope with the socio-cognitive aspects of inter-organizational ontology development. An evaluation experiment for this method is accomplished in the scope of a large European project in the area of industrial engineering. The method evaluation and its results are described. We conclude by describing avenues of ongoing and future research.
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    Rural Postman Problem and Related Problems
    ( 2009) José Soeiro Ferreira ; Ana Maria Rodrigues
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    Flexibility Requirements Model to Achieve Leagility in Dynamic Virtual Organizations
    ( 2010) João Bastos ; Américo Azevedo ; Paulo Ávila
    The paper proposes a Flexibility Requirements Model to support the Dynamic Virtual Organization decision-makers in order to reach effective response to the emergent business opportunities ensuring profitability. Through the construction and analysis of the flexibility requirements model, the network managers can achieve and conceive better strategies to model and breed new dynamic VOs. This paper also presents the leagility concept as a new paradigm fit to equip the network management with a hybrid approach that better tackle the performance challenges imposed by the new and competitive business environments.
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    An Innovative framework supporting business networks for complex product manufacturing
    ( 2010) Américo Azevedo ; Timmo Kankaanpaa ; Ahm Shamsuzzoha ; Ricardo João Almeida ; Luís Carneiro
    Current market dynamics require European SME's to focus on complex products manufacturing and to build non-hierarchical business networks, to assure competitiveness and sustainability. Such trend demands appropriate methods for network formation and management, including reference collaboration processes and supporting ICT tools. This paper presents a framework to support SME's in the creation and management of non-hierarchical networks designed and developed within the European RTD project Net-Challenge. This framework includes methodologies, processes and ICT decision support tools aiming at the efficient creation and management of these networks assuring quick response times and competitive and differentiated offerings.
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    Equilibria on a Game with Discrete Variables
    ( 2010) João Pedro Pedroso ; Yves Smeers
    Equilibrium in Economics has been seldom addressed in a situation where some variables are discrete. This work introduces a problem related to lot-sizing with several players, and analyses some strategies which are likely to be found in real world games. An illustration with a simple example is presented, with concerns about the di culty of the problem and computation possibilities.
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    Virtual Factory Framework: An Innovative Approach to Support the Planning and Optimization of the Next Generation Factories
    ( 2010) António Henrique Almeida ; João Bastos ; Américo Azevedo
    Industrial managers are in the expectation that the new generation factories bring more competitiveness to the manufacturing companies through innovative approaches, methods and tools that support the factory planning process. The concept of 'factory as a product' perceives the factory as a complex long life product introducing design advantages for factory planning and optimization, seeking to improve quality, reduce ramp-up, product delivery and overall reduce time and costs. In order to attain these objectives, there is an urgent need for an innovative and suitable Virtual Factory Framework to structure the development of new generation factories.
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    Spatial Analysis of Sea Outfall Discharges
    ( 2010) Nuno Miguel Abreu ; Patrícia Ramos
    Outfalls are designed to promote the natural assimilative capacity of the oceans to dispose of wastewaters with minimal environmental impact. This is accomplished through the vigorous initial mixing that is followed by oceanic dispersion within spatially and temporally varying currents. Usually, those mixing processes, in conjunction to bacterial mortality, result in rapid reductions in the concentrations of contaminants and organisms present in the wastewater to near background levels. However, coastal physical, chemical and biological processes, very dynamic and complex, and intimately coupled to the concentration and content of wastewater, are in most instances, poorly understood. Much effort has been devoted recently to improve means to monitor and characterize effluent plumes under a variety of oceanographic conditions, on relevant temporal and spatial scales. However, effluent plumes dispersion is still a difficult problem to study in situ. Autonomous Underwater Vehicles (AUVs) already demonstrated to be very appropriate for high-resolution surveys of small features such as outfall plumes. Some of the advantages of these platforms include: easier field logistics, low cost per deployment, good spatial coverage and capability of feature-based or adaptive sampling. In this paper we use geostatistics in the spatial analysis of environmental data gathered with an autonomous underwater vehicle (AUV)in a monitoring campaign to a sea outfall, aiming: (i) to distinguish the e
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    Building an informal ontology to support collaborative network operation: a case study
    ( 2010) António Lucas Soares ; Cristovão Sousa ; Carla Pereira
    Regarding collaborative networks as social-technical systems, information and knowledge sharing implies sharing a set of common conceptual structures across organizations. Through this paper, we describe a case study on how to construct meaningful collective conceptualizations, by means of a new approach based on conceptual blending theory.
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    Managing Performance to Align the Participants of Collaborative Networks: Case Studies Results
    ( 2010) Roberto Piedade Francisco ; Américo Azevedo ; João Bastos
    The paper underlines the interest of using a performance management system applied to monitor the strategy effectiveness and the interoperation's performance in the collaborative networks (CN). The aim with this study is to verify if a performance management system helps decisionmakers reach the alignment among participants in a collaborative network. It is expected that this work provides an adequate tool for supporting quick decisions to meet the feasible and desirable improvements in interorganisational processes. A framework (CNPMS) is also presented, having been developed to support the dynamic performance management, which was applied in case studies of two Brazilian collaborative networks.
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    Integration of domain and social ontologies in a CMS based collaborative platform
    ( 2010) Luís Carlos Carneiro ; Cristovão Sousa ; António Lucas Soares
    This paper describes an approach and an implementation for the semantic integration of social and domain ontologies in a collaborative platform. The platform, built based on the Drupal CMS framework, aims to offer SMEs possibilities to access specific knowledge by means of a collaborative community. A model to semantically express the socio-collaborative activities of the platform connected with the domain knowledge related to the project is presented. The model is based on existing W3C ontologies such as FOAF, SIOC and SIOC-types for the socio-collaborative semantics and SKOS to describe the domain knowledge. An architecture to support the model and related applications of the semantic metadata generated in the platform are also described.