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Midterm supply chain planning under uncertainty / Kishalay Mitra in Industrial & engineering chemistry research, Vol. 47 n°15 (Août 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°15 (Août 2008) . - p. 5501–5511 Titre : Midterm supply chain planning under uncertainty : a multiobjective chance constrained programming framework Type de document : texte imprimé Auteurs : Kishalay Mitra, Auteur ; Ravindra D. Gudi, Auteur ; Sachin C. Patwardhan, Auteur ; Gautam Sardar, Auteur Année de publication : 2008 Article en page(s) : p. 5501–5511 Note générale : Bibliogr. p. 5510-5511 Langues : Anglais (eng) Mots-clés : Chain  planning;  Chance  constrained  programming  approach Résumé : Uncertainty issues associated with a multisite, multiproduct supply chain planning problem has been analyzed in this paper, using the chance constrained programming (CCP) approach. In the literature, such problems have been addressed using the scenario-based two-stage stochastic programming approach. Although this approach has merits, in terms of decomposition, the computational complexity, even for small-size planning problems, is generally quite large, leading to either huge time consumption in solving the problem or an inability to solve big instances of problems under a standard solver environment. To make the aforementioned lacunea of two-stage stochastic programming more tractable, the problems under uncertainty have been recast in this paper in a CCP framework that uses a more suitable representation of uncertainty. Addressing uncertainty issues in product demands and machine uptime, using the CCP approach, leads to the evaluation of multiobjective tradeoffs that are analyzed here in the Pareto sense, and the ε-constraint approach is used to generate those Pareto optimal (PO) points. Different aspects of uncertainty issues are analyzed in detail by taking a few PO points among the total set of PO solutions found for this problem. It is seen that this CCP-based approach is quite generic, relatively simple to use and can be adapted for bigger size planning problems, as the equivalent deterministic problem does not blow up in size with the CCP approach. We demonstrate the analysis on a relatively moderate size midterm planning problem taken from published work [McDonald, C. M.; Karimi, I. A. Ind. Eng. Chem. Res. 1997, 36, 2691] and discuss various aspects of uncertainty in the context of this problem. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie0710364 [article] Midterm supply chain planning under uncertainty : a multiobjective chance constrained programming framework [texte imprimé] / Kishalay Mitra, Auteur ; Ravindra D. Gudi, Auteur ; Sachin C. Patwardhan, Auteur ; Gautam Sardar, Auteur . - 2008 . - p. 5501–5511. Bibliogr. p. 5510-5511 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°15 (Août 2008) . - p. 5501–5511 Mots-clés : Chain  planning;  Chance  constrained  programming  approach Résumé : Uncertainty issues associated with a multisite, multiproduct supply chain planning problem has been analyzed in this paper, using the chance constrained programming (CCP) approach. In the literature, such problems have been addressed using the scenario-based two-stage stochastic programming approach. Although this approach has merits, in terms of decomposition, the computational complexity, even for small-size planning problems, is generally quite large, leading to either huge time consumption in solving the problem or an inability to solve big instances of problems under a standard solver environment. To make the aforementioned lacunea of two-stage stochastic programming more tractable, the problems under uncertainty have been recast in this paper in a CCP framework that uses a more suitable representation of uncertainty. Addressing uncertainty issues in product demands and machine uptime, using the CCP approach, leads to the evaluation of multiobjective tradeoffs that are analyzed here in the Pareto sense, and the ε-constraint approach is used to generate those Pareto optimal (PO) points. Different aspects of uncertainty issues are analyzed in detail by taking a few PO points among the total set of PO solutions found for this problem. It is seen that this CCP-based approach is quite generic, relatively simple to use and can be adapted for bigger size planning problems, as the equivalent deterministic problem does not blow up in size with the CCP approach. We demonstrate the analysis on a relatively moderate size midterm planning problem taken from published work [McDonald, C. M.; Karimi, I. A. Ind. Eng. Chem. Res. 1997, 36, 2691] and discuss various aspects of uncertainty in the context of this problem. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie0710364

Resiliency issues in integration of scheduling and control / Kishalay Mitra in Industrial & engineering chemistry research, Vol. 49 N° 1 (Janvier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 1 (Janvier 2010) . - pp. 222–235 Titre : Resiliency issues in integration of scheduling and control Type de document : texte imprimé Auteurs : Kishalay Mitra, Auteur ; Ravindra D. Gudi, Auteur ; Sachin C. Patwardhan, Auteur Année de publication : 2010 Article en page(s) : pp. 222–235 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Resiliency--Issues--Integration--Scheduling--Control Résumé : Integration of scheduling and control in process manufacturing systems has traditionally resulted in greater coordination between the different layers of hierarchy in optimization and control. However, the effectiveness of this coordination as well as the overall responsiveness of the manufacturing system could be greatly improved if such integration explicitly accounts for parametric variations at each of the layers. This paper proposes an approach to the problem of robust integration of the scheduling and control layers in an uncertainty analysis framework so as to yield robust manufacturing systems that can perform well in the presence of the parametric variations. The uncertainty analysis is performed here using different uncertainty approaches such as the chance constrained programming, fuzzy mathematical programming, and robust optimization. In this paper, we propose to analyze the impact of the uncertainty on the different manufacturing objectives in a multiobjective Pareto sense. The deterministic integrated scheduling and control model taken from published work [Flores-Tlacuahuac, A.; Grossmann, I. E. Ind. Eng. Chem. Res. 2006, 45, 6698] forms the basis of our work toward addressing the uncertainty issues. We demonstrate the development of improved and robust integration of the scheduling and control tasks using the proposed frameworks. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900380s [article] Resiliency issues in integration of scheduling and control [texte imprimé] / Kishalay Mitra, Auteur ; Ravindra D. Gudi, Auteur ; Sachin C. Patwardhan, Auteur . - 2010 . - pp. 222–235. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 1 (Janvier 2010) . - pp. 222–235 Mots-clés : Resiliency--Issues--Integration--Scheduling--Control Résumé : Integration of scheduling and control in process manufacturing systems has traditionally resulted in greater coordination between the different layers of hierarchy in optimization and control. However, the effectiveness of this coordination as well as the overall responsiveness of the manufacturing system could be greatly improved if such integration explicitly accounts for parametric variations at each of the layers. This paper proposes an approach to the problem of robust integration of the scheduling and control layers in an uncertainty analysis framework so as to yield robust manufacturing systems that can perform well in the presence of the parametric variations. The uncertainty analysis is performed here using different uncertainty approaches such as the chance constrained programming, fuzzy mathematical programming, and robust optimization. In this paper, we propose to analyze the impact of the uncertainty on the different manufacturing objectives in a multiobjective Pareto sense. The deterministic integrated scheduling and control model taken from published work [Flores-Tlacuahuac, A.; Grossmann, I. E. Ind. Eng. Chem. Res. 2006, 45, 6698] forms the basis of our work toward addressing the uncertainty issues. We demonstrate the development of improved and robust integration of the scheduling and control tasks using the proposed frameworks. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900380s