Motivated by a proposal of the local authority for improving the existing healthcare system in the Parana State in Brazil, this article presents an optimization-based model for developing a better system for patients by aggregating various health services offered in the municipalities of Parana...

The paper by Wang and Triantaphyllou [Ranking irregularities when evaluating alternatives by using some ELECTRE methods. Omega, 2008; 36(1): 45-63] (W & T) pinpoints in an interesting way some limitations of ELECTRE II and III methods. The objective of this note is to draw the attention of the...

Multi-objective combinatorial optimization (MOCO) problems, apart from being notoriously difficult and complex to solve in reasonable computational time, they also exhibit high levels of instability in their results in case of uncertainty, which often deviate far from optimality. In this work we...

In this paper, we present an aggregate production planning (APP) model applied to a Portuguese firm that produces construction materials. A multiple criteria mixed integer linear programming (MCMILP) model is developed with the following performance criteria: (1) maximize profit, (2) minimize...