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Publications

Publications by João Bastos

2011

Scheduling a Cutting and Treatment Stainless Steel Sheet Line with Self-Management Capabilities

Authors
Madureira, A; Pereira, I; Sousa, N; Avila, P; Bastos, J;

Publication
COMPUTATIONAL INTELLIGENCE FOR ENGINEERING SYSTEMS: EMERGENT APPLICATIONS

Abstract
With advancement in computer science and information technology, computing systems are becoming increasingly more complex with an increasing number of heterogeneous components. They are thus becoming more difficult to monitor, manage, and maintain. This process has been well known as labor intensive and error prone. In addition, traditional approaches for system management are difficult to keep up with the rapidly changing environments. There is a need for automatic and efficient approaches to monitor and manage complex computing systems. In this paper, we propose an innovative framework for scheduling system management by combining Autonomic Computing (AC) paradigm, Multi-Agent Systems (MAS) and Nature Inspired Optimization Techniques (NIT). Additionally, we consider the resolution of realistic problems. The scheduling of a Cutting and Treatment Stainless Steel Sheet Line will be evaluated. Results show that proposed approach has advantages when compared with other scheduling systems.

2012

Supplier's selection model based on an empirical study

Authors
Avila, P; Mota, A; Pires, A; Bastos, J; Putnik, G; Teixeira, J;

Publication
4TH CONFERENCE OF ENTERPRISE INFORMATION SYSTEMS - ALIGNING TECHNOLOGY, ORGANIZATIONS AND PEOPLE (CENTERIS 2012)

Abstract
The problem of selecting suppliers/partners is a crucial and important part in the process of decision making for companies that intend to perform competitively in their area of activity. The selection of supplier/partner is a time and resource-consuming task that involves data collection and a careful analysis of the factors that can positively or negatively influence the choice. Nevertheless it is a critical process that affects significantly the operational performance of each company. In this work, there were identified five broad selection criteria: Quality, Financial, Synergies, Cost, and Production System. Within these criteria, it was also included five sub-criteria. After the identification criteria, a survey was elaborated and companies were contacted in order to understand which factors have more weight in their decisions to choose the partners. Interpreted the results and processed the data, it was adopted a model of linear weighting to reflect the importance of each factor. The model has a hierarchical structure and can be applied with the Analytic Hierarchy Process (AHP) method or Value Analysis. The goal of the paper it's to supply a selection reference model that can represent an orientation/pattern for a decision making on the suppliers/partners selection process (C) 2012 Published by Elsevier Ltd. Selection and/or peer review under responsibility of CENTERIS/SCIKA - Association for Promotion and Dissemination of Scientific Knowledge

2010

Analysis of the Domain of Applicability of an Algorithm for a Resources System Selection Problem for Distributed/Agile/Virtual Enterprises Integration

Authors
Avila, P; Costa, L; Bastos, J; Lopes, P; Pires, A;

Publication
SISTEMAS Y TECNOLOGIAS DE INFORMACION

Abstract
The process of resources systems selection takes an important part in Distributed/Agile/Virtual Enterprises (D/A/V Es) integration. However, the resources systems selection is still a difficult matter to solve in a D/A/VE, as it is pointed out in this paper. Globally, we can say that the selection problem has been equated from different aspects, originating different kinds of models/algorithms to solve it. In order to assist the development of a web prototype tool (broker tool), intelligent and flexible, that integrates all the selection model activities and tools, and with the capacity to adequate to each D/A/V E project or instance (this is the major goal of our final project), we intend in this paper to show: a formulation of a kind of resources selection problem and the limitations of the algorithms proposed to solve it. We formulate a particular case of the problem as an integer programming, which is solved using simplex and branch and bound algorithms, and identify their performance limitations (in terms of processing time) based on simulation results. These limitations depend on the number of processing tasks and on the number of pre-selected resources per processing tasks, defining the domain of applicability of the algorithms for the problem studied. The limitations detected open the necessity of the application of other kind of algorithms (approximate solution algorithms) outside the domain of applicability founded for the algorithms simulated. However, for a broker tool it is very important the knowledge of algorithms limitations, in order to, based on problem features, develop and select the most suitable algorithm that guarantees a good performance

2010

Virtual Factory Framework: An innovative approach to support the planning and optimization of the next generation factories

Authors
Azevedo, A; Francisco, RP; Bastos, J; Almeida, A;

Publication
IFAC Proceedings Volumes (IFAC-PapersOnline)

Abstract
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. © 2010 IFAC.

2012

Advanced services for supply chain design processes in collaborative networks

Authors
Coscia, EA; Fornasiero, R; Bastos, J; Azevedo, A; Rotondi, D; Piccione, S;

Publication
IFIP Advances in Information and Communication Technology

Abstract
Design and production of small series for specific customer target groups in collaborative networks can help companies to increase their competitiveness. This paper aims to describe a new framework of services for collaborative networking for on-demand productions. After describing the business processes that need to be supported by innovative tools for partner search and collaborative production planning, we describe the developed services and how they are integrated to ease the communication between different activities. © 2012 International Federation for Information Processing.

2012

An Information Infrastructure to Support the Prescription Process of Specific Customer-oriented Products

Authors
Meneses, P; Azevedo, A; Bastos, J;

Publication
4TH CONFERENCE OF ENTERPRISE INFORMATION SYSTEMS - ALIGNING TECHNOLOGY, ORGANIZATIONS AND PEOPLE (CENTERIS 2012)

Abstract
In order to address the market trends especially footwear companies are now forced to address the market and especially the individual customer with increased attention concerning the fulfillment of specific requirements. In that context, consumer needs and expectations of specific target groups such as diabetic persons are posing challenging opportunities. Reality has shown that the production of shoes for patients with diabetic foot is quite different from traditional footwear production. This occurs because each shoe has to be fully adapted for each patient and in accordance with a set of requirements prescribed by the podiatrist. This reality raises several procedural and information related constraints in the way the orthopedic manufacturer has to deal with the customer demand. Framed in this goal, the present work specifically addresses the information infrastructure support required for the diabetic foot patient's prescription process by proposing an overall approach based on web-based tools and innovative integration of technological solutions. (C) 2012 Published by Elsevier Ltd. Selection and/or peer review under responsibility of CENTERIS/SCIKA - Association for Promotion and Dissemination of Scientific Knowledge

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