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Projeto de investigação
INCORPORATING THE THREE PILLARS OF SUSTAINABILITY INTO SUPPLY CHAIN DESIGN AND PLANNING
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Green supply chain design and planning
Publication . Mota, Bruna; Carvalho, Ana; Gomes, Maria Isabel; Barbosa Póvoa, Ana; CMA - Centro de Matemática e Aplicações; DM - Departamento de Matemática
Sustainability is more than ever a central concern when deciding a company’s strategy. Stakeholders are continuously pressuring industries to further reduce their environmental impact. In order to achieve that, it is imperative to look for solutions across all of the company’s operations adopting a supply chain view. However, supply chains’ complexity makes this a challenging task. Analysing the sustainability of such complex systems requires the use of capable tools as are optimization models. Several of these models can be found in the literature, mostly focusing on specific issues or specific decisions in the supply chain. Therefore, a research gap is found in models capable of handling a wider variety of decisions. With this work a mixed integer linear programming model is used to demonstrate the impact of including more or less options/decisions on design and planning decisions, and on the environmental performance of a supply chain. A case-study based on a Portuguese pulp and paper company is analysed. The results obtained for different scenarios are examined.
Sustainable supply chains: an integrated modeling approach under uncertainty
Publication . Mota, Bruna; Gomes, Maria Isabel; Carvalho, Ana; Barbosa-Povoa, Ana Paula; CMA - Centro de Matemática e Aplicações; Elsevier
This work presents ToBLoOM – Triple Bottom Line Optimization Modeling, a decision support tool for the design and planning of sustainable supply chains. It consists of a multi-objective mixed integer linear programming model which integrates several interconnected decisions: facility location and capacity determination; supplier selection and purchase levels definition; technology selection and allocation; transportation network definition including both unimodal and intermodal options; supply planning; product recovery and remanufacturing. The three pillars of sustainability are addressed as objective functions: economic, through Net Present Value; environmental through the Life Cycle Analysis methodology ReCiPe; and social through a developed GDP-based metric. Uncertainty is considered using a stochastic ToBloOM. This applied to a case of a European based company with markets in Europe and South America. This work contributes to the literature by building on several identified research gaps such as the need for an integrated approach that allows simultaneous assessment of different interacting supply chain decisions, the need to explicitly assess the environmental impact in closed-loop supply chains, the need to assess the impact of supply chains on society, and the need for a multi-objective tool that includes all the three pillars of sustainability. Strategies towards a more sustainable supply chain are also derived from this work.
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Fundação para a Ciência e a Tecnologia
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SFRH/BD/51947/2012