Process systems engineering (PSE) has been an active research area for nearly seventy years and addresses multiple systems from the process industry. Among these are Process Supply Chains that can be described as interconnected sets of entities responsible for the sourcing, production and...
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This paper proposes a framework for the qualitative and quantitative characterization of maintenance work to support Maintenance, Repair, and Overhaul (MRO) organizations in performing capacity planning and scheduling. A quantitative assessment based on 372 maintenance projects collected at...
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The social dimension of sustainability in supply chains has grown in importance in both academic and industrial communities. This article aims to understand how social dimension has been incorporated in supply chain management research in the past years and what research gaps still exist. For...
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The paper deals with the product design problem where the characteristics of new and remanufactured products must be determined. The objective of the problem is to maximize the total profit taking into account the design specifications and the selling prices for the new and...
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Supply chains express the sequence of steps related to the production process, from procurement of raw materials to deliver final products to the customer market. The complexity of the impacts caused by supply chains has given rise to the problem of planning sustainable supply chains (SSCs). SSCs...
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Several suppliers of oil and gas (O & G) equipment and services have reported the necessity of making frequent resources planning adjustments due to the variability of demand, which originates in unbalanced production levels. The occurrence of these specific problems for the suppliers and...
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The aging population alongside little availability of informal care are two of the several factors leading to an increased need for assisted living support. In this work, we tackle a home social care service problem, motivated by two real case studies where a new loyalty scheme must be considered: within...
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Multiproduct chemical batch plants, often equipped with parallel production lines, are facilities where similar products are produced by sharing available equipment and time. Hence, when designing such plants, the operational use should be considered simultaneously. In this paper, the design and...
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This paper addresses the optimal scheduling of an oil transportation system characterized by a straight multiproduct pipeline featuring multiple input and output nodes, where products are dispatched to local markets often by tanker trucks. We present a new continuous-time mixed integer...
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The oil industry operates in a very uncertain marketplace, where uncertain conditions can engender oil production fluctuations, order cancellation, transportation delays, etc. Uncertainty may arise from several sources and inexorably affect its management by interfering in the associated...
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When it was first introduced, the concept of sustainability in the forestry sector had a narrow focus on sustainable wood production. Since then, this concept has evolved and it now considers now the three sustainability dimensions (economic, environmental and social) of the whole forest wood supply...
Continue ReadingA multi-objective mixed integer linear programming model is developed to support supply chain design and planning decisions with societal goals. The developed model is built based on ToBLoOM, a Triple Bottom Line Optimization Modeling tool. Decisions include which suppliers to select, where to locate...
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Life cycle assessment (LCA) is the most applied methodology to compare the environmental impacts of different products and processes. As uncertainty may be present in the first three steps of an LCA an uncertainty analysis should be considered allowing higher confidence in the results. However, few...
Continue ReadingThis paper develops a mixed-integer linear programming (MILP) formulation to support the design and planning of agri-food supply chains (AFSC). The model focuses on the strategic-tactical decisions of capacity definition, selection of processing technologies, and the establishment of product flows...
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Nowadays the growing concerns about the environment and society in general led companies to invest in a sustainable development. In this way, companies’ design and planning decisions need to encompass simultaneously economic, environmental and social concerns. In addition, considering...
Continue ReadingThe development of hybrid simulation-optimization methods has allowed to explore the complexities of planning and scheduling problems. In this work, a simulation-optimization approach is developed to provide decision-support to industrial processes, combining a mathematical formulation with a...
Continue ReadingThe progress of the current energy infrastructure to a new pattern, where hydrogen plays an important role has been increasing the interest of industrial communities, as well as, academics. This is mainly associated with sustainability goals where reducing environmental impacts is a target while...
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The inefficiencies observed in current agro-food supply chains, and recent trends in agro-food industry such as consolidation, increase the need for further studies on supply chain management in this field. Models are required for the complex task of determining the optimal supply chain configuration...
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Life cycle Assessment (LCA) is increasingly being applied as a decision variable in supply chain design and planning models. However, the lack of standardized guidelines in its application, raises questions regarding the usefulness and validity of the results obtained in these studies. This study aims to...
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This paper proposes a two-commodity flow formulation for the MDVRP considering a heterogeneous vehicle fleet and maximum routing time. Its computational performance is compared to a traditional formulation, the so called three-index formulation, which is adapted to fit the same problem...
Continue ReadingThe purpose of this article is to present a qualitative model that allows researchers and practitioners to analyze activities that can contribute to eco-efficiency in the context of Green Supply Chain Management. A literature review identified 21 green practices, organized in four groups using cluster...
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In this work, the design and operation planning of a multi-period, multi-product closed-loop supply chain is addressed. Recovered end-of-life products from customers are evaluated in disassembly centers and accordingly are sent back to factories for remanufacturing, or leave the network either by...
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The enterprise management of current industrial processes has becoming increasingly complex, imposing novel challenges to the implementation of efficient decision support tools. Manual-based planning/scheduling systems have been replaced by integrated computational tools for core...
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Medical training is an intricate and long process, which is compulsory to medical practice and often lasts up to twelve years for some specialties. Health stakeholders recognise that an adequate planning is crucial for health systems to deliver necessary care services. However, proper planning needs to...
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European countries are attempting to promote sustainable development by transitioning from a linear to a circular economy, where waste is to be prevented and recycling activities are promoted. This paper studies the implementation of Extended Producer Responsibility (EPR) policies for the packaging...
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Capacity planning is an important problem faced by aircraft Maintenance, Repair and Overhaul (MRO) organizations given the uncertainty of maintenance workloads. Despite the considerable amount of data generated and stored during the planning process, these have yet to provide a decisive...
Continue ReadingStaff scheduling involves assigning people to tasks organized in working shifts. It is a complex and time-consuming activity common to several real-world companies while still typically a hand-made task. These problems are usually conditioned by legal and working rules, and by personal...
Continue ReadingA Dynamic Inventory Routing Problem model embedded into a rolling horizon solution approach is developed, along this paper, to solve the Smart Waste Collection Routing Problem. This allows the definition of dynamic waste collection routes that explore the use of real-time information on the bins...
Continue ReadingSupply Chains (SC) have been facing a vast set of events that can endanger their operations and produce permanent damage, which are unknown until its occurrence. This led to an increased awareness of SC Resilience to deal with such SC uncertainty. This work uses a Mixed Integer Linear...
Continue ReadingSupply chains have become one of the most important strategic themes in the aerospace industry in recent years as globalization and deep technological changes have altered the industry at many levels, creating new dynamics and strategies. In this setting, sustainability at the supply chain level is...
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Sustainable Supply Chain is nowadays an increasing area of concern for both academia and industry that aims to design, plan and operate supply chains that guarantee market needs while considering not only profit objectives but also environmental and social concerns in a solution of compromise...
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Personnel scheduling is a difficult problem with many specific requirements that differ between industries or companies. This paper proposes an Integer Programming (IP) formulation for the staff scheduling problem encountered in practice at an Emergency Medical Services (EMS) system. Two...
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This work explores a decision-support solution for the management of advanced flexible manufacturing systems operated by mobile robotic resources with a simulation-optimization methodology for the production planning and scheduling of automated assembly lines. The...
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This paper addresses the integration of two relevant problems within industry: raw material purchasing and production planning. The raw material purchasing problem considers the presence of several suppliers, each one with its own cost of materials and discount rates. The production planning...
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This work analyses partial information sharing involving retailers with different operational configurations. Retailers are characterized by four operational factors, i.e., demand variance, lead time average, forecasting period and inventory policy. The findings show that the performance...
Continue ReadingSupply chain management is concerned with the efficient integration of interconnected entities so that products are sourced, manufactured and distributed in the right quantities, to the right locations and at the right time, thus satisfying customer requirements at minimal total system cost. Such systems...
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Waste collection is nowadays an increasingly important business. However, it is often an inefficient operation due to the high uncertainty associated with the real waste bins’ fill-levels. To deal with such uncertainty the use of sensors to transmit real time information is seen as possible solution. But, in...
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An improvement on the scheduling of pumping and delivery operations in an installed pipeline network can lead to considerable profits to the using companies, such as oil companies. This paper proposes a decomposition approach that integrates heuristic procedures and mixed integer linear programming...
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Sustainable Supply Chain have become a cornerstone to any company that seeks to achieve sustainable goals. A company's image is no longer related to the old paradigm of being sustainable in its own activities, but instead is associated with a strong collaboration between all supply chain...
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This paper addresses the operation of a unidirectional multiproduct pipeline system integrated with inventory tanks management at the refinery and distribution center. A Mixed Integer Linear Programming (MILP) formulation is proposed to model the scheduling of a pipeline operation...
Continue ReadingLife Cycle Assessment (LCA) is the most used methodology to assess the environmental impacts of supply chains. Despite being the most used methodology, LCAs studies regarding forest wood supply chains considering an exhaustive Life Cycle Impact Assessment (LCIA) approach are still lacking...
Continue ReadingGlobalization has increased the exposure of Supply Chains (SC) to higher uncertainties that call for adequate strategies, thus supporting the creation of SC Resilience. There is, however, no absolute strategy that decision makers can follow to guarantee such resilience and the knowledge on how to...
Continue ReadingParallel production lines are a design option often used in chemical batch plants. In recent research, this option has been introduced into the strategic multiproduct batch plant design problem, assuming a single product campaign mode of operation. However, to accommodate for other modes of...
Continue ReadingThis paper approaches the tactical distribution planning in the downstream oil supply chain (DOSC) under uncertain market conditions by using robust optimization (RO). The tactical RO model makes use of general polyhedral uncertainty sets, which encompass the so-called ramping constraints...
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The aim of the present work is to provide an integrated decision support approach for the design and scheduling of multipurpose batch plants under demand uncertainty allowing the assessment of alternative risk profile solutions. Based on two-stage mixed integer linear programming (MILP) model...
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In the oil supply chain, products transportation by pipelines is the most used distribution modal, justified by its high volume capacity, reliability, and safety compared to the other transportation modes. The scheduling of pumping and delivery operations in pipelines is a complex problem. Thus, a...
Continue ReadingTaking into account the increase of business competitiveness and legislation compliance faced by industry’s SC, environmental SC problems became a reality that companies have to deal with. This work is developed along this line and proposes a mixed integer linear programming model (MILP)...
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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...
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Manufacturing industries depend on robust internal logistics operations that enable efficient production strategies, as is the case of an assembly line feed by an internal logistics supermarket. Agile decision making in flexible manufacturing elevates the need for planning the overall shop-floor...
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Despite the increased interest in social sustainability there is still lack of information for the social assessment, as well as a lack of appropriate quantitative social sustainability indicators to perform such assessment. In this paper, there is proposed a set of 31 quantitative social sustainability...
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The shortage of natural resources, the need to take into account societal considerations, the emergence of new government regulations and the necessity to maintain and/or improve the economic benefit of the supply chain, have created a growing awareness on academia as well as...
Continue ReadingThis paper proposes a decomposition approach combining heuristic algorithms and Mixed Integer Linear Programming (MILP) models to solve the long-term scheduling of a multiproduct pipeline connecting a single-source to multiple distribution centers. The solution considers many operational...
Continue ReadingWhile planning to expand its tissue paper business, a Portuguese company aims to explore options regarding the design and planning of its supply chain accounting not only for economic objectives but also environmental and social concerns (the three pillars of sustainability). A multi-objective mixed...
Continue ReadingPetroleum Supply Chains (PSC) networks are complex organizations, strongly affected by competition, environmental regulation and market uncertainty. To improve profits and reduce costs and risks, companies may use mathematical programming for strategic, tactical and operational planning. The...
Continue ReadingSustainability 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...
Continue ReadingThis paper studies the definition of dynamic routes regarding the waste collection problem. Based on access to real-time information, provided by sensors located at waste bin containers, a Vehicle Routing Problem with Profits (VRPP) solution approach is developed. This aims for the maximization of...
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This paper analyses the impact on supply chain performance of adopting different strategies to implement partial information sharing among heterogeneous retailers. Supply chains are modelled using a multi-agent systems approach. We find that the strategy adopted to construct the partial...
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This paper develops a multistage stochastic programming to optimally solve the distribution problem of refined products. The stochastic model relies on a time series analysis, as well as on a scenario tree analysis, in order to effectively deal and represent uncertainty in oil price and demand. The ARIMA...
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Resilience is currently an increasing concern in supply chain (SC), caused by their globalization, which is subject to diverse types of disturbances. Such disturbances need to be handled in the right way, compelling the use of tools that can support resilient supply chain decisions. To comprehend how...
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This paper studies the network design for a multi-product, multi-echelon and multi-period closed-loop supply chain (CLSC) accounting for decisions on the manufacture of new products and remanufactured versions of the new products. It is important to note that the design for...
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his paper addresses the design and planning of integrated biorefineries supply chain under uncertainty. A two-stage stochastic mixed integer linear programming (MILP) model is proposed considering the presence of uncertainty in the residual lignocellulosic biomass availability and technology conversion...
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Uncertainties arise from several sources and may introduce diverse risks within the oil supply chain (OSC), hindering its management, besides raising costs and lowering margins. The purpose of this work is to present a new stochastic approach to deal with different sources of uncertainty, by...
Continue ReadingCompanies are continuously being pressured by governments, customers and NGOs to become environmentally sustainable. In the process industries this is a very important problem since the environmental impacts are often very significant. Although the assessment of the environmental...
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This paper presents an innovative approach to solve the product-launch planning problem in the pharmaceutical industry, with uncertainty on the product demand and on clinical trials. A mixed integer linear programming (MILP) model, incorporating Monte Carlo simulation (MCS), was developed for...
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The planning of a supply chain (SC) subject to market demand uncertainty is challenging in regards to defining update mechanisms that deal with demand variations. This study addresses this challenge and proposes a new reorder point update procedure for order-up-to-level (OUTL) policies in...
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Increased pressures from stakeholders have been forcing companies to integrate social sustainability into their businesses. However, lack of information leads to gaps in social sustainability, some of them being also related to difficulties in social sustainability assessment of supply chains often caused by...
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A large number of problems in a distribution supply chain require that decisions are made in the presence of the bullwhip effect phenomenon. The impact of the order batching policies on the bullwhip effect is analysed in this paper, when cycle demand on a multi-echelon supply chain operating is...
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This work explores the problem of optimizing batch processes’ retrofit design pursuing an increase of production efficiency and efficacy while accounting for the associated processes’ sustainability, aspect that within the process industry is nowadays of increasing concern. Batch processes are often...
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This paper presents a mixed integer linear programing (MILP) model, based on a continuous-time Resource Task Network (RTN) formulation, for the optimal planning/scheduling of biopharmaceutical processes. The model proposes the integration of the production planning with the required...
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Supply chains are changing their business paradigm as they strive for sustainability and not just for increasing profits. Sustainability, however, is a concept that is open to interpretation since it is based on societal and organizational values. Little is known about what companies actually mean when...
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The retail industry sector is one of the most competitive and where each company has to improve their operations on a daily basis to remain competitive. The struggle to move to just-in-time delivery requires distribution centres to readapt to this reality. Most of the literature in warehouse layout design is...
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The concepts of green chemistry and engineering (GC&E) have been promoted as an effective qualitative framework for developing more sustainable chemical syntheses, processes, and material management techniques. This has been demonstrated by many theoretical and practical cases. In...
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This work addresses the optimal planning and campaign scheduling of biopharmaceutical manufacturing processes, considering multiple operational characteristics, such as the campaign schedule of batch and/or continuous process steps, multiple intermediate deliveries, sequence...
Continue ReadingSupply sChains (SC) have appeared for the first time in the literature more than thirty years ago. Since then the Supply Chains Management area has grown considerably at both research and industrial levels and SC are nowadays underpinning systems of any organization. In its classical form supply...
Continue ReadingIncreased interest for sustainability reporting has been provoking both, companies and academics to deepen their research in sustainability and therefore on sustainability indicators. When assessing social sustainability a lack of knowledge is present and due to the increased stakeholders’ pressures...
Continue ReadingFood supply chains (FSC) have been receiving increased attention throughout the recent years. The inherent products’ characteristics associated with the logistics activities require an approach beyond the traditional one, where specific food supply chain characteristics need to be considered namely...
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In order to reduce the effects of water pollution by anthropogenic causes, it is critical to use wastewater treatment plants networks (WWTNs) as an option to remove contaminants that are considered harmful to human health (Bagajewicz and Faria, 2009). These systems are also a...
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This paper presents a mixed integer linear programing (MILP) model, based on a continuous-time Resource Task Network (RTN) formulation, for the optimal planning/scheduling of biopharmaceutical processes. The model proposes the integration of the production planning with the required...
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Network design and planning is instrumental to improve the Petroleum Supply Chains (PSC) competitiveness, affected nowadays by the economic crisis, alternative energy competition and price related uncertainties. This poses the need of developing stochastic models for simultaneous profit...
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Global markets have been facing an increasing competitiveness, leading to a dramatic intensification of the market pressures in terms of business sustainability. Businesses, through their industrial processes, urgently require retrofit actions for improving their sustainability performance...
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This paper presents a comprehensive risk-averse multistage model for dealing with the design and planning problem of a closed-loop supply chain (CLSC) considering adjustments in the supply chain structure during the planning horizon as well as uncertainty in supply and customer demands. The...
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The oil industry has been playing a particular role in the modern economy, acting globally in different countries within competitive business environments. Due to the complexity of the oil supply chain, the associated decision making process is a difficult task, which involves numerous elements from oil...
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Supply Chains are complex networks that demand for decision supporting tools that can help the involved decision making process. Following this need the present paper studies the supply chain design and planning problem and proposes an optimization model to support the associated...
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This paper addresses an integrated framework for deciding about the supplier selection in the processed food industry under uncertainty. The relevance of including tactical production and distribution planning in this procurement decision is assessed. The contribution of this paper is...
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During the last two decades, EU legislation has put increasing pressure on member countries to achieve specified recycling targets for municipal household waste. These targets can be obtained in various ways choosing collection methods, separation methods, decentral or central logistic systems...
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This paper analyzes how order batching policies impact on the bullwhip effect over a multi-echelon distribution supply chain facing cyclic demand. As a demand cycle is repeated over the time planning horizon, a wrapping around operator is considered and based on this a single cycle is required to...
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A Mixed Integer Linear Programming model for the design and planning of green supply chains is developed. Strategic and tactical decisions are taken, namely on facility location and capacity installation, supplier selection, technology selection, transportation network definition, supply...
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This work deals with characterization of the dynamic behavior of a single product supply chain (SC) composed by two levels. It is modeled by Industrial Dynamics concepts developed by Jay Forrester in the 60's with the objective of determining the information and material flows using a discrete...
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This paper considers the optimal design and planning problem of a closed-loop supply chain (CLSC) where profit maximization is pursued while considering: adjustments in the network structure during the planning horizon providing flexibility to the network as well as uncertainty in supply and customer...
Continue ReadingIn the present work a design and planning model with uncertainty in products’ demand is applied to two supply chains (SCs): a traditional forward network and a closed-loop supply chain (CLSC). The objective is to maximize the ENPV and evaluate their resilience towards different types of disruption...
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In this paper, a mixed integer linear programming (MILP) formulation is proposed that integrates financial risk measures into the design and planning of closed-loop supply chains, considering demand uncertainty of final products. The goal is to maximize the supply chain expected net present value...
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This study proposes a multi-objective and multi-period mathematical programming model to support planning decisions in the Long-Term Care (LTC) sector. The model provides information to help planning the delivery of institutional LTC services in the medium-term, both in terms of location...
Continue ReadingThis paper presents an innovative approach to solve the product-launch planning problem in the pharmaceutical industry, with uncertainty on the product demand and on clinical trials. A mixed integer linear programming (MILP) model, incorporating Monte Carlo simulation (MCS), was developed for...
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This paper presents OPTMESC, an integer linear programming model developed for production scheduling in the mould industry, which is based on discrete, make-to-order job shop production. The model was implemented in GAMS modelling system and solved with commercial software for real...
Continue ReadingThis work aims to study the economic impact of incorporating corporate social responsibility issues in supply chain design and planning. A mathematical programming model that allows the optimal design and planning of supply chains is developed. A social benefit indicator is established where the...
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Costumers and governments are pressuring companies to become more sustainable. However, the lack of research on how to incorporate these issues makes this a challenging task. To fill this gap a generic multi-objective mathematical programming model for the design and planning of supply...
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This paper considers a multi-echelon inventory/distribution system formed by N-warehouses and M-retailers that manages a set of diverse products in a dynamic environment. Transshipment at both regional warehouses and retailers levels is allowed. A mixed integer linear programming model is...
Continue ReadingAlthough not a common practice, proper planning of health care networks should consider the attainment of health gains and the impact of inter-sector health policy options. This study proposes a multi-objective stochastic model to support location-allocation decisions in the long-term care sector...
Continue ReadingTask scheduling and resource allocation problems have been the subject of intense research over the past decades, particularly within Operations Research. However, seldom optimization models have been proposed to address the aircraft maintenance management process in an integrated manner...
Continue ReadingThis paper studies alternative scenarios for a recyclable waste collection system in order to increase efficiency in their operations. Three alternative scenarios are proposed where two different locations for one or two additional depots are studied. The problem is considered as a multi-depot...
Continue ReadingThe energy sector has dominated the world attention as recently arrived shale gas and slumping crude oil prices globally affect Petroleum Supply Chains (PSC). Fluctuating demand and prices are forcing companies to rethink existing distribution networks and production plans in order to improve network...
Continue ReadingThis paper discusses the current trends in optimization methods for solving planning and scheduling problems in the chemical-pharmaceutical industry. The challenges of this industry and the recent advances in modeling these problems show that optimization methods need to provide highly...
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Within a large set of renewable energies being explored to tackle energy sourcing problems, bioenergy can represent an attractive solution if effectively managed. The supply chain design supported by mathematical programming can be used as a decision support tool to the successful bioenergy...
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Closed-loop supply chain (CLSC) design implies the modelling of the forward and the reverse flows of products in an integrated way. This paper introduces nonlinear dimensioning factors in the design of CLSC and uses ant colony optimization to optimize the design of the supply chain. The...
Continue ReadingSupply Chain Design problems often result into multiperiod stochastic mixed integer problems that are hard to solve. In this paper we propose a metaheuristic algorithm as a specialization for two- stage problems of the so-named Fix-and-Relax Algorithm presented previously for solving large-scale...
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Design and planning of petroleum supply chains (PSC) present significant opportunity as financial crunches and variability in crude oil prices continue augmenting volatility among the petroleum product prices, costs, margins and demand. To deal with this challenge, we present a stochastic...
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The manufacturing of pharmaceutical products is preceded by complex development phases where process design, planning, and scheduling problems must be considered as deeply linked, fact that has not yet been adequately handled by the existing literature. In this perspective, this work discusses the...
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As in other segments of the food industry, the ice-cream industry has its own features that influence the production management of its processes. Amongst these we identify: changeover tasks, products shelf-life, raw-materials (RM) perishability and, multiple deliveries during the planning horizon...
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Pipelines play an important role in the oil supply chain linking different supply chain echelons and acting as one of the most sustainable, safe economical transportation mode. In this context, multiproduct pipeline scheduling is a key issue to be addressed in an optimized form, namely when...
Continue ReadingIn this work, a multi-objective mixed integer linear programming (moMILP) model is presented for the design and planning of sustainable closed loop supply chains. It includes strategic decisions such as facility location, definition of transportation modes, technology selection and allocation, as...
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Considering key uncertainties and health policy options in the reorganization of a long-term care (LTC) network is crucial. This study proposes a stochastic mixed integer linear programming model for planning the delivery of LTC services within a network of care where such aspects are modeled in...
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Although the maximization of health is a key objective in health care systems, location-allocation literature has not yet considered this dimension. This study proposes a multi-objective stochastic mathematical programming approach to support the planning of a multi-service network of...
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The design and planning of resilient supply chains is a major challenge due to the increasing complexity of these systems that operate in a global market and therefore are more exposed to disruptions. In the present work a design and planning model that integrates demand uncertainty is...
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The European Commission presented the Life Cycle Assessment as the best framework for evaluating the environmental impact of products/processes. Companies are trying to reduce the environmental impact of products/processes, therefore the European Commission underlined the need for...
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This study proposes two location–allocation models for handling uncertainty in the strategic planning of hospital networks. The models aim to inform how the hospital networking system may be (re)organized when the decision maker seeks to improve geographical access while minimizing...
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The goal of this paper is to quantify the impact of Inventory Record Inaccuracy on the dynamics of collaborative supply chains, both in terms of operational performance (i.e. order and inventory stability), and customer service level. To do so, we model an Information Exchange Supply Chain...
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