References of "Limbourg, Sabine"
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See detailDesigning unmanned aerial vehicle networks for biological material transportation
dhote, Jeremy; Limbourg, Sabine ULiege

Scientific conference (2019, May 24)

Unmanned Aerial Vehicles (UAVs) may solve, or at least reduce, the negative impacts of road transport such as pollution or congestion. This study deals with the UAVs network design problem for biomedical ... [more ▼]

Unmanned Aerial Vehicles (UAVs) may solve, or at least reduce, the negative impacts of road transport such as pollution or congestion. This study deals with the UAVs network design problem for biomedical material transportation in line with the Drone4Care project. We begin with a PESTEL analysis to provide an overview of the various macro-environmental factors to be taken into consideration. To specify the objectives of the project and identify the internal and external factors that are favourable and unfavourable to achieving those objectives, a SWOT analysis is also performed. The elevated issues are translated into a number of quantifiable scenario elements, containing the most plausible upcoming events impacting the future of UAVs network for biological material. The developed location model is applied to the city of Brussels and periphery, with associated market in terms of biomedical products flows (blood units or medical samples transported between hospitals, laboratories, and blood transfusion centres) in the context of separate case studies of scenario-based analysis. The experiments show that if the return to the launching base is required, the total distance is greater than if this constraint is relaxed. This is a crucial point regarding limited range of UAVs. The use of charging stations is thus useful to extend the mission ranges and gain market share. The results also show the possibility of gradually implementing the bases, without requiring any major changes such as to close a base. [less ▲]

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See detailLa logistique collaborative
Limbourg, Sabine ULiege

Conference given outside the academic context (2019)

L'objectif d’une logistique collaborative et coopérative est de générer conjointement un profit en mettant en commun les ressources, en partageant et en tirant parti des forces et des capacités ... [more ▼]

L'objectif d’une logistique collaborative et coopérative est de générer conjointement un profit en mettant en commun les ressources, en partageant et en tirant parti des forces et des capacités spécifiques des entreprises participantes. [less ▲]

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See detailHow can Food Loss and Waste management achieve the Sustainable Development Goals?
Lemaire, Anaïs ULiege; Limbourg, Sabine ULiege

Conference (2019, February 07)

Food Loss and Waste occur at all stages of the Supply Chain. We reviewed the literature to identify the causes and classify the proposed solutions in order to reach the number 12.3 Sustainable Development ... [more ▼]

Food Loss and Waste occur at all stages of the Supply Chain. We reviewed the literature to identify the causes and classify the proposed solutions in order to reach the number 12.3 Sustainable Development Goal: ''2030, halve per capita global food waste at the retail and consumer levels and reduce food losses along production and supply chains, including post-harvest losses''. In our ongoing research, we focus on food waste and related single use packaging waste in the healthcare sector. [less ▲]

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See detailLife cycle externalities versus external costs: the case of inland freight transport in Belgium
Merchan Arribas, Angel ULiege; Léonard, Angélique ULiege; Limbourg, Sabine ULiege et al

in Transportation Research. Part D, Transport and Environment (2019), 67

This paper proposes a case study on Belgium in which externalities and external costs of inland freight transport modes in Belgium are compared for the year 2012. The well-known Life Cycle Assessment ... [more ▼]

This paper proposes a case study on Belgium in which externalities and external costs of inland freight transport modes in Belgium are compared for the year 2012. The well-known Life Cycle Assessment methodology is used to identify the updated specific Belgian externalities related to three categories of negative impacts: climate change, photochemical ozone formation and particulate matter formation. The obtained values of externalities are then compared to the related external cost values. The objective is to determine if these two tools can be used interchangeably. We find that road transport has the maximum impact for every environmental impact indicator, with rail freight transport presenting the minimum one. We identify that each category of negative impact on the environment does not represent the same percentage of global externalities and external costs. In the analysis of the environmental impact per mode, it is observed that, when external costs are considered instead of externalities, the impact of road transport is slightly increased compared to both impacts of rail and inland waterways. Using externalities and average external costs interchangeably for estimating the impact of specific transport categories on the environment may thus lead to different results and different related policies. [less ▲]

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See detailA bilevel model for network design and pricing based on a level-of-service assessment
Tawfik, Christine Maher Fouad ULiege; Limbourg, Sabine ULiege

in Transportation Science (2019)

Within a wide view to stimulate intermodal transport, this paper is devoted to the examination of the intrinsically related problems of designing freight carrying services and determining their associated ... [more ▼]

Within a wide view to stimulate intermodal transport, this paper is devoted to the examination of the intrinsically related problems of designing freight carrying services and determining their associated prices as observed by the shipper firms. A path-based multicommodity formulation is developed for a medium-term planning horizon, from the perspective of an intermodal operator. In the quest of incorporating nonprice attributes, two approaches are proposed to depict a realistic assessment of the service quality. First, frequency delay constraints are added to the upper level problem. Second, based on a random utility model, behavioural concepts are integrated in the expression of the lower level as a logistics costs minimization problem. Exact tests are invoked on real-world instances, demonstrating the capability of the presented approaches of reaching reasonable results within acceptable computation times and optimality gaps. The broader level-of-service perspective imposes additional costs on the service providers, although to a lesser extent on long-distance freight corridors, as indicated by the computed market share and net profit. Further experiments are conducted to test the impact of certain transport management instruments (e.g. subsidies and service capacities) on the modal split, as well as to assess the intermodality's future based on a scenario analysis methodology. [less ▲]

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See detailA tailored two-phase constructive heuristic for the three-dimensional Multiple Bin Size Bin Packing Problem with transportation constraints
Paquay, Célia ULiege; Limbourg, Sabine ULiege; Schyns, Michael ULiege

in European Journal of Operational Research (2018), 267(1), 52-64

This paper considers the three-dimensional Multiple Bin Size Bin Packing Problem which consists in packing a set of cuboid boxes into containers of various shapes with minimising unused space. The problem ... [more ▼]

This paper considers the three-dimensional Multiple Bin Size Bin Packing Problem which consists in packing a set of cuboid boxes into containers of various shapes with minimising unused space. The problem is extended to air cargo where bins are Unit Load Devices, especially designed for fitting in aircraft. We developed a fast constructive heuristic able to manage the different constraints met in transportation. The heuristic is split into two distinct phases. The first phase deals with the packing of boxes into identical bins using an extension of the Extreme Points. During this phase, the fragility, stability and orientations of the boxes are taken into account as well as the special shape of the bins and their weight capacity. The second phase takes into account the multiple types of available bins. If necessary, the best found loading pattern is finally enhanced with respect to weight distribution in a post processing. After parametrisation, computational experiments have been performed on data sets especially designed for this application. The heuristic requires really short computational times to achieve promising results. [less ▲]

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See detailHow to include the durability, resale and losses of returnable transport items in their management?
Limbourg, Sabine ULiege; Pirotte, Myriem

in Proceedings (2018, April 12)

Reducing environmental nuisances, related regulations and the pursuit of economic advantages are the main reasons why companies share their returnable transport items (RTIs) among the different partners ... [more ▼]

Reducing environmental nuisances, related regulations and the pursuit of economic advantages are the main reasons why companies share their returnable transport items (RTIs) among the different partners of a closed-loop supply chain. However RTIs have a finite lifetime, which means that they can be used only a limited number of times. Moreover, the company has to dispose of these items and one interesting way to proceed is to resell them, hence the resale aspect which is strongly linked to the durability feature. Finally, the loss of RTIs is a frequent problem faced by companies. Both durability and losses generate the need to purchase more RTIs. [less ▲]

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See detailOperational assessment of intermodality future in Belgium: Best - case scenario
Tawfik, Christine Maher Fouad ULiege; Limbourg, Sabine ULiege

in Proceedings (2018, April 10)

From the perspective of stimulating intermodal transport as an ecological and economically promising freight transport scheme in the EU, this paper is devoted to assess its future position with respect to ... [more ▼]

From the perspective of stimulating intermodal transport as an ecological and economically promising freight transport scheme in the EU, this paper is devoted to assess its future position with respect to crucial and plausible operational factors that were selected a priori. The study is conducted in the context of a best-case scenario development, within a rational and optimal decision making framework. We address this goal by designing a realistic medium-term network design and pricing model, from the economic perspective of a typical intermodal operator, fitted to the sequential mathematical structure of bilevel programming. Based on real-life sized data, in and through Belgium, the results underline the costly position of rail transport and a clear correlation between the competitiveness of intermodal transport on one side, and the market size and the trucking competition's price on the other. It is additionally suggested that intermodal transport can benefit from small rail subsidies in the early market covering stages. [less ▲]

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See detailUn modèle intégré d'aide à la décision pour la logistique urbaine
Limbourg, Sabine ULiege

Conference (2018, January 30)

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See detailIntermodal network design: a three-mode bi-objective model applied to the case of Belgium
Mostert, Martine ULiege; Caris, An; Limbourg, Sabine ULiege

in Flexible Services and Manufacturing Journal (2018)

Freight transport planning is nowadays encouraged to align with environmental objectives. Among those, climate change is of particular interest for many countries. In its White Paper on Transport, the ... [more ▼]

Freight transport planning is nowadays encouraged to align with environmental objectives. Among those, climate change is of particular interest for many countries. In its White Paper on Transport, the European Commission considers intermodal transport as a potential solution for reducing environmental impacts. In order to make good strategic transport decisions, realistic decision support models for freight transport networks must be developed, so that insights can be derived for the different stakeholders of the transportation chain. This research proposes a bi-objective mathematical formulation which takes into account economic and environmental objectives, on a road and intermodal network with three modes of transport (road, intermodal rail, and intermodal inland waterways), and in which economies of scale of intermodal transport can be considered. With this model better fitting reality, an application to the Belgian case study provides practical information on how flows, terminal types and locations vary depending on the chosen policy, on the integration or not of economies of scale, on costs or emissions modifications and on the number of terminals to locate. Results show that the chosen policy influences the terminal type and the intermodal market share. The study also highlights the interest of intermodal transport on short distances, and the risk of flow exchanges inside the intermodal market share, rather than between road and intermodal transport. [less ▲]

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See detailPricing Problems in Intermodal Freight Transport: Research Overview and Prospects
Tawfik, Christine Maher Fouad ULiege; Limbourg, Sabine ULiege

in Sustainability (2018), 10(9), 3341

The aim of this paper is to consider the topic of pricing decisions in the context of intermodal transport as a subject of significant influence on intermodality’s success and the move towards environment ... [more ▼]

The aim of this paper is to consider the topic of pricing decisions in the context of intermodal transport as a subject of significant influence on intermodality’s success and the move towards environment friendly modes to bring about a European sustainable transport system. We review the state of research in intermodal pricing from an Operational Research (OR) perspective as a subject with a vital link to energy consumption and sustainability assessment. In particular, we study freight transport within a revenue-maximizing perspective. Driven by the political incentives to enhance its challenged market position, we direct our discussion to the particular gap in optimization approaches that tackle service prices as explicit tactical decisions from the carriers’ point of view. A suggestion to utilize the bilevel programming framework in the present context is put forward, as well as an account of its widely successful application to similar hierarchical decision schemes. Different approaches to express the shippers’ behaviour—the potential intermodal transport customers—within the lower level problem are proposed, along with the modelling implications of different possible objectives as well as the multimodal network structures. [less ▲]

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See detailMIP-based constructive heuristics for the three-dimensional Bin Packing Problem with transportation constraints
Paquay, Célia ULiege; Limbourg, Sabine ULiege; Schyns, Michael ULiege et al

in International Journal of Production Research (2018), 56(4), 1581-1592

This article is about seeking a good feasible solution in a reasonable amount of computation time to the three-dimensional Multiple Bin Size Bin Packing Problem (MBSBPP). The MBSBPP studied considers ... [more ▼]

This article is about seeking a good feasible solution in a reasonable amount of computation time to the three-dimensional Multiple Bin Size Bin Packing Problem (MBSBPP). The MBSBPP studied considers additional constraints encountered in real world air transportation situations, such as cargo stability and the particular shape of containers. This MBSBPP has already been formulated as a Mixed Integer linear Programming problem, but as yet only poor results have been achieved for even fairly small problem sizes. The goal of the work this paper describes is to develop heuristics that are able to quickly provide good initial feasible solutions for the MBSBPP. Three methodologies are considered, which are based on the decomposition of the original problem into easier subproblems: the matheuristics Relax-and-Fix, Insert-and-Fix and Fractional Relax-and-Fix. They have been parametrised on real data sets and then compared to each other. In particular, two of these techniques show promising results in reasonable computational times. [less ▲]

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See detailOptimisation des transports : de la mer à la terre
Limbourg, Sabine ULiege

in Lihoussou, Messan; Steck, Benjamin (Eds.) Moderniser les ports ouest-africains. Enjeux et perspectives. (2018)

Operations research (OR) is a quantitative approach that uses advanced analytical methods to help managers make better decisions. The application of its techniques to freight transport and supply chain ... [more ▼]

Operations research (OR) is a quantitative approach that uses advanced analytical methods to help managers make better decisions. The application of its techniques to freight transport and supply chain management raises challenges due to the structural complexity, the conflicting objectives of the various stakeholders, the foreseeable variations as well as the uncertainties inherent to studied cases. This article focuses on a collection of problems related to maritime, land and air transport that illustrate the three levels of decision-making: strategic, tactical and operational. The inherent characteristics of certain types of problems, their size or their complexity have given rise to the development of new heuristics. However, further developments are still needed. Research and studies have to be carried out to obtain good solutions for the new challenges arising from transport and logistics. [less ▲]

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See detailNANO-STORE RETAILERS’ DISTRIBUTION SYSTEM MANAGEMENT IN EMERGING COUNTRIES
Sabiri, Asmaa; Riane, Fouad; Limbourg, Sabine ULiege

Scientific conference (2017, October)

Emerging megacities are still abounded with traditional distribution channels. These retail formats need to be visited and supplied very frequently, which turns to be costly and time consuming. In this ... [more ▼]

Emerging megacities are still abounded with traditional distribution channels. These retail formats need to be visited and supplied very frequently, which turns to be costly and time consuming. In this paper, we address an optimization problem for supplying nanostores (or high frequency stores), while combining districting problem and an altered traveling salesman problem. We present a reallife case study where a company tries to build an effective strategy to cover and supply its nanostores’ network. The problem of concern is modeled as an assignment problem, combined with side constraints regarding disruption of pre-assignments and profit potential balance. The results show that the objective function gives better solution when it’s a combination of both profit and workload balance. [less ▲]

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