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Publications

Publications by SYSTEM

2013

Cyclic staff scheduling: optimization models for some real-life problems

Authors
Rocha, M; Oliveira, JF; Carravilla, MA;

Publication
JOURNAL OF SCHEDULING

Abstract
In this work, we propose a general integer programming model to address the staff scheduling problem, flexible enough to be easily adapted to a wide-range of real-world problems. The model is applied with slight changes to two case studies: a glass plant and a continuous care unit, and also to a collection of benchmark instances available in the literature. The emphasis of our approach is on a novel formulation of sequence constraints and also on workload balance, which is tackled through cyclic scheduling. Models are solved using the CPLEX solver. Computational results indicate that optimal solutions can be achieved within a reasonable amount of time.

2013

Cutting and packing

Authors
Bennell, JA; Oliveira, JF; Waescher, G;

Publication
INTERNATIONAL JOURNAL OF PRODUCTION ECONOMICS

Abstract

2013

Performance Measurement

Authors
Ferreira, S; Cunha, PF; Carneiro, LM; Toscano, C;

Publication
Intelligent Non-hierarchical Manufacturing Networks

Abstract
Performance measurement determines, based on data, if the process, business unit or organization is progressing toward the goals as planned. This chapter describes the approach proposed for performance measurement, that is part of the Net-Challenge framework for the performance management in collaborative networks (CNs). The chapter first presents an overview of performance measurement in the framework and introduces the concept of the performance factor. Some typical performance factors and some known approaches are elaborated. Collaboration is addressed in particular. Next, the chapter discusses factorization and disaggregation as the development of the performance factors in two dimensions. Then, the chapter explains the three main activities of performance measurement, including definition of what to measure and targets setting, setup of a measurement system, and measurement and analysis of performance. Finally, the chapter briefly provides information and communication technology (ICT) platform to support performance management. ©2013 by John Wiley & Sons, Inc.

2013

A Collaborative Planning Approach for Non-hierarchical Production Networks

Authors
Almeida, R; Toscano, C; Azevedo, AL; Carneiro, LM;

Publication
Intelligent Non-hierarchical Manufacturing Networks

Abstract
This chapter presents an innovative collaborative planning (CP) approach for non-hierarchical production networks that enhances collaboration between partners in two different lifecycle phases of the virtual organizations (VOs). The first phase concerns the first planning iteration for the customer, and it basically defines the operations plan and a quotation for the customer, supported by a negotiation process between partners. The second phase concerns a detailed specification of the manufacturing operation and its planning. The chapter first presents a summary of the main trends and previous work concerning collaborative network (CN), governance models and approaches for CP. Next, it provides the requirements for the CP. The chapter ends with the methodology proposed for CP, considering two planning schemes and the evaluation of the quality of the solutions. © 2013 by John Wiley & Sons, Inc.

2013

Case studies on collaboration, technology and performance factors in business networks

Authors
Carneiro, LM; Soares, AL; Patrício, R; Azevedo, AL; de Sousa, JP;

Publication
INTERNATIONAL JOURNAL OF COMPUTER INTEGRATED MANUFACTURING

Abstract
This paper presents part of the findings of a research project aiming at characterising high-performance collaborative business networks and at defining the conditions required for their creation and management. The project adopted a multiple case study research strategy and three different business networks are presented in this paper. Empirical studies have been performed in Northern Portugal. The results of the study include operational definitions based on a comprehensive literature review, a conceptual reference framework for the analysis of high-performance collaborative networks and recommendations for the creation and management of such networks.

2013

Flexible and Reconfigurable Layouts in Complex Manufacturing Systems

Authors
Azevedo, MM; Crispim, JA; de Sousa, JP;

Publication
ADVANCES IN PRODUCTION MANAGEMENT SYSTEMS: COMPETITIVE MANUFACTURING FOR INNOVATIVE PRODUCTS AND SERVICES, AMPS 2012, PT I

Abstract
This paper studies the Facility Layout Problem (FLP) of a first tier supplier in the automotive industry. This complex manufacturing system involves multiple facilities, complex products, and layout reconfiguration constraints. One of the key requirements of this particular system is the need for high levels of flexibility in the reconfiguration of the layouts. This problem is formulated as a mixed-integer programming (MIP), based on a FLP model with multiple objectives and unequal areas. The model allows for two reconfiguration types: small and large changes. We explore the application of optimization methodologies to produce efficient and flexible layouts.

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