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Three time-based scale formulations for the two-stage lot sizing and scheduling in process industries / V. C. B. Camargo in Journal of the operational research society (JORS), Vol. 63 N° 11 (Novembre 2012) 

Public ISBD [article]  in Journal of the operational research society (JORS) > Vol. 63 N° 11 (Novembre 2012) . - pp. 1613–1630 Titre : Three time-based scale formulations for the two-stage lot sizing and scheduling in process industries Type de document : texte imprimé Auteurs : V. C. B. Camargo, Auteur ; F. M. B. Toledo, Auteur ; B. Almada-Lobo, Auteur Année de publication : 2012 Article en page(s) : pp. 1613–1630 Note générale : operational research Langues : Anglais (eng) Mots-clés : lot  sizing  and  scheduling;  two-stage  production  system;  mixed-integer  program;  time  scale Index. décimale : 001.424 Résumé : In this paper, we propose three novel mathematical models for the two-stage lot-sizing and scheduling problems present in many process industries. The problem shares a continuous or quasi-continuous production feature upstream and a discrete manufacturing feature downstream, which must be synchronized. Different time-based scale representations are discussed. The first formulation encompasses a discrete-time representation. The second one is a hybrid continuous-discrete model. The last formulation is based on a continuous-time model representation. Computational tests with state-of-the-art MIP solver show that the discrete-time representation provides better feasible solutions in short running time. On the other hand, the hybrid model achieves better solutions for longer computational times and was able to prove optimality more often. The continuous-type model is the most flexible of the three for incorporating additional operational requirements, at a cost of having the worst computational performance. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n11/abs/jors2011159a.html [article] Three time-based scale formulations for the two-stage lot sizing and scheduling in process industries [texte imprimé] / V. C. B. Camargo, Auteur ; F. M. B. Toledo, Auteur ; B. Almada-Lobo, Auteur . - 2012 . - pp. 1613–1630. operational research Langues : Anglais (eng) in Journal of the operational research society (JORS) > Vol. 63 N° 11 (Novembre 2012) . - pp. 1613–1630 Mots-clés : lot  sizing  and  scheduling;  two-stage  production  system;  mixed-integer  program;  time  scale Index. décimale : 001.424 Résumé : In this paper, we propose three novel mathematical models for the two-stage lot-sizing and scheduling problems present in many process industries. The problem shares a continuous or quasi-continuous production feature upstream and a discrete manufacturing feature downstream, which must be synchronized. Different time-based scale representations are discussed. The first formulation encompasses a discrete-time representation. The second one is a hybrid continuous-discrete model. The last formulation is based on a continuous-time model representation. Computational tests with state-of-the-art MIP solver show that the discrete-time representation provides better feasible solutions in short running time. On the other hand, the hybrid model achieves better solutions for longer computational times and was able to prove optimality more often. The continuous-type model is the most flexible of the three for incorporating additional operational requirements, at a cost of having the worst computational performance. DEWEY : 001.424 ISSN : 0160-5682 En ligne : http://www.palgrave-journals.com/jors/journal/v63/n11/abs/jors2011159a.html