References of "Limbourg, Sabine"
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See detailA road map for explorative scenario creation on Belgian rail freight transport development
Troch, Franck; Vanelslander, Thierry; Sys, Christa et al

in Competition and Regulation in Network Industries (in press)

The starting point of this article is the weak usage of rail freight in Belgium and Europe, both as a sustainable mode of land transportation in itself as well as a part of the intermodal chain. The ... [more ▼]

The starting point of this article is the weak usage of rail freight in Belgium and Europe, both as a sustainable mode of land transportation in itself as well as a part of the intermodal chain. The results are obtained by transversal research on rail freight transport in Belgium, taking into account the European context. This interdisciplinary research develops a road map for the creation of three integrated scenarios: a best case, medium case and worst case scenario for rail freight development, based on a detailed SWOT (strength, weakness, opportunities, threats) analysis. It includes the most probable future developments for rail freight transport and hinterland connections. These developments are obtained from literature review and discussions with a heterogeneous panel of experts in the fields of (i) optimal corridor and hub development, (ii) macroeconomic impact, (iii) sustainability, (iv) effective market regulation and (v) governance and organization for a well-functioning intermodality. The Delphi approach is used in combination with a survey analysis. Frequency tables and the H-index allow defining a ranking and selection of SWOT elements. The obtained scenarios allow future research to quantify and measure the impact of future developments and decisions towards the Belgian rail freight market. [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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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 (2017)

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 detailIs a new definition of intermodal transport interesting for transferring flows from road to more environmentally friendly modes?
Mostert, Martine ULiege; Limbourg, Sabine ULiege; Caris, An

Conference (2017, July)

Road remains the most used mode in Europe. Even if it is appreciated for its responsiveness, flexibility, and quickness, road transport is however responsible for negative impacts on its environment like ... [more ▼]

Road remains the most used mode in Europe. Even if it is appreciated for its responsiveness, flexibility, and quickness, road transport is however responsible for negative impacts on its environment like air pollution or climate change. Intermodal freight transport i.e. the transportation of goods using two or more modes of transport, in the same loading unit, without handling of the goods themselves is identified by the European Commission as an interesting solution for limiting the negative impacts of transport. In the classical conception of intermodal transport, pre- and post-haulage travels are supposed to be short, and to be performed by road transport, whereas the long-haul travel is done using rail or inland waterways (IWW). The objective of this study is to determine the impact on intermodal attractiveness of allowing other combinations of modes than the classical road-rail/IWW-road combination, during an intermodal travel. The goal is to determine the flow distribution of goods between direct transportation by road, rail or IWW, and any combination of these modes using intermodal transport. The novelty consists in taking into account three modes of transport in a mixed integer programming model, and to allow the transfer from any mode to any other at intermodal terminals where these modes coexist. For testing the hypothesis of intermodal transport attractiveness on medium to long distance, the model is applied to experimental data at the European level. [less ▲]

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See detailAn integrated logistics decision support model for city logistics
Limbourg, Sabine ULiege

Scientific conference (2017, June 28)

Today, more than 50% of the world's population lives in cities; the urban population is projected to reach 85% by 2100. Mainly due to urbanization and e-commerce, the demand for urban freight transport ... [more ▼]

Today, more than 50% of the world's population lives in cities; the urban population is projected to reach 85% by 2100. Mainly due to urbanization and e-commerce, the demand for urban freight transport (both forward flows and reverse flows) is clearly growing. But, transport is also responsible for a large share of urban air pollution as well as noise nuisance. Thus, an integrated logistics system to optimize transport network and service design, as well as vehicles routing of a variety of modes has to be developed. The objective is to determine how to efficiently move freight by means of these services and vehicles, while reducing negative environmental impacts. The topic includes research questions related to the demand to be serviced, the type and number of facilities needed to store and consolidate freight, the better utilization of vehicle capacity (fill rate and fewer empty trips: on average, 25% of goods vehicles in Europe run empty) and the reduction of energy consumption. [less ▲]

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See detailIntermodal transport: does a wider definition improve its competitiveness?
Mostert, Martine ULiege; Limbourg, Sabine ULiege; Caris, An

Conference (2017, June)

With the opening of borders and always greater decentralization of production, freight transport increased a lot in the last decades. Road remains the most used mode in Europe (Eurostat, 2016). Even if it ... [more ▼]

With the opening of borders and always greater decentralization of production, freight transport increased a lot in the last decades. Road remains the most used mode in Europe (Eurostat, 2016). Even if it is appreciated for its responsiveness, flexibility, and quickness, road transport is however responsible for negative impacts on its environment like air pollution or climate change. Intermodal freight transport i.e. the transportation of goods using two or more modes of transport, in the same loading unit, without handling of the goods themselves (United Nations, 2001) is identified by the European Commission (2011) as an interesting solution for limiting the negative impacts of transport. In the classical conception of intermodal transport, pre- and post-haulage travels are supposed to be short, and to be performed by road transport, whereas the long-haul travel is done using rail or IWW. The combination of these modes allows reducing the negative externalities of the whole travel, i.e. the negative impacts that are generated by transport operators, but which are not directly supported by them. These externalities in particular consist in air pollution and climate change, provoked by the release of emissions which lead to air pollution and human health problems. The objective of this study is to determine the impact on intermodal attractiveness of allowing other combinations of modes than the classical road-rail/IWW-road combination, during an intermodal travel. The research is based on tools of the operations research domain and proposes the development of an allocation model for freight transport at the strategic level of decision. The goal is to determine the flow distribution of goods between direct transportation by road, rail or inland waterways, and any combination of these modes using intermodal transport. The novelty consists in taking into account three modes of transport in a mixed integer programming model, and to allow the transfer from any mode to any other at intermodal terminals where these modes coexist. [less ▲]

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See detailInventory routings problems for the management of Returnable Transportation Items with durability constraints
Pirotte, Myriem; Limbourg, Sabine ULiege

in Cools, Mario; Limbourg, Sabine (Eds.) Proceedings of the BIVEC-GIBET Transport Research Days 2017: Towards an Autonomous and Interconnected Transport Future (2017)

RTIs managements are quite diverse. Research efforts are thus needed in the areas of RTI acquisition; warehouse layout, inventory routing problem; production planning and control; tracking and scheduling ... [more ▼]

RTIs managements are quite diverse. Research efforts are thus needed in the areas of RTI acquisition; warehouse layout, inventory routing problem; production planning and control; tracking and scheduling. In this paper, the inventory-routing problem for the management of RTIs developed in Iassinovskaia et al. (2017) has been enriched by adding constraints referring to specificities that can be encountered in real life, such as minimum threshold or a maximum ceiling of RTIs to be returned or durability. Durability can be characterized by the number of times an RTI can be used which is called maximum number of lives n. For instances, glass bottle can be used 25 times, wooden pallet 50 times and Crates for bottles 120 times (Geyer et al., 2007). [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 of the BIVEC/GIBET Transport Research Days 2017 (2017, May)

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 detailThe Fleet Size and Mix Vehicle Routing Problem with sequence-based pallet loading and axle weight constraints
Pollaris, Hanne; Braekers, Kris; caris, An et al

in Cools, Mario; Limbourg, Sabine (Eds.) Proceedings of the BIVEC-GIBET Transport Research Days 2017: Towards an Autonomous and Interconnected Transport Future (2017)

In this paper, the Fleet Size and Mix Vehicle Routing Problem (FSM) with sequence-based pallet loading and axle weight constraints is introduced. The effect of the integration of axle weight constraints ... [more ▼]

In this paper, the Fleet Size and Mix Vehicle Routing Problem (FSM) with sequence-based pallet loading and axle weight constraints is introduced. The effect of the integration of axle weight constraints in a FSM is analyzed by comparing the FSM with and without axle weight constraints. A vehicle fleet of 30-foot and 45-foot trucks, consisting of a tractor and a semi-trailer, is considered. Furthermore, two scenarios are analyzed for which the objective function differs: in the first scenario the objective is to minimize total distance while in the second scenario the objective is the minimization of total transport costs. An Iterated Local Search metaheuristic algorithm is used to tackle the problem. The results indicate that the vehicle fleet strongly influences the impact of the integration of axle weight constraints on solution cost. Furthermore, the analysis points out that fleet size and mix decisions may be influenced by the integration of axle weight constraints. [less ▲]

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See detailBuilding an Effective Strategy To Supply High Frequency Stores in Emerging Cities
Sabiri, Asmaa; Riane, Fouad; Limbourg, Sabine ULiege

in Cools, Mario; Limbourg, Sabine (Eds.) Proceedings of the BIVEC-GIBET Transport Research Days 2017: Towards an Autonomous and Interconnected Transport Future (2017)

Traditional distribution channels that cover nanostores still abound in merging megacities. These traditional retail formats need to be visited and supplied very frequently (High Frequency Stores) which ... [more ▼]

Traditional distribution channels that cover nanostores still abound in merging megacities. These traditional retail formats need to be visited and supplied very frequently (High Frequency Stores) which turns to be costly and time consuming if not well optimized. Supplying High Frequency Stores in emerging countries involves different constraints that make the associated optimization problems complex. In this paper, we deal with a real-life application problem where a company try to build an effective strategy to cover and to supply nanostores. We present an altered approach to a multi-depot multiple traveling salesman problem. 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 multi-objective function produces better profit and workload balance than setting a simple objective function and a constraint, one for the profit balance and the other for workload balance and vice-versa. [less ▲]

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See detailCan any possible combination of modes improve intermodal attractiveness?
Mostert, Martine ULiege; Caris, An; Limbourg, Sabine ULiege

in Proceedings of the BIVEC-GIBET Transport Research Days 2017 (2017, May)

In its White Paper on Transport, the European Commission recognizes intermodal transport as an alternative solution to road transport. In practice, intermodal transport can be constituted by any ... [more ▼]

In its White Paper on Transport, the European Commission recognizes intermodal transport as an alternative solution to road transport. In practice, intermodal transport can be constituted by any combination of modes, while in the literature, intermodal transport is often modeled as a combination of modes in the order “road-rail/inland waterway-road”. This work develops a new intermodal allocation model which allows choosing between any direct (road, rail and inland waterways) transport and any intermodal transport chain constituted by up to three modes of transport. Intermodal solutions can pass through one or two intermodal terminals. Applied on experimental data at the European level, the model gives insight on the optimal flow distribution for economic objectives (optimization of transport operational costs) and environmental objectives (optimization of transport CO2 emissions and air pollution external costs). Results highlight that the traditional modeling of intermodal transport as a “road-rail/inland waterway-road” combination better fits economic than environmental objectives. [less ▲]

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See detailRail-road terminals location with interconnected rail network of West African countries
LIHOUSSOU, Messan; Limbourg, Sabine ULiege

in Cools, Mario; Limbourg, Sabine (Eds.) Proceedings of the BIVEC-GIBET Transport Research Days 2017: Towards an Autonomous and Interconnected Transport Future (2017)

From 2006 to 2012, the port of Cotonou improves its performance thanks to the Millennium Challenge Account program, through modernization of port facilities and management systems. But the project not ... [more ▼]

From 2006 to 2012, the port of Cotonou improves its performance thanks to the Millennium Challenge Account program, through modernization of port facilities and management systems. But the project not concerns transport corridors and hinterland access. However, no port can develop without its links with its hinterland. That’s why we analyse the issues relating to the hinterland transport development with respect to the with interconnected rail network of West African countries. This network project allows us to build up a multimodal/intermodal transport network from and to the port of Cotonou since inland terminals may have an important role in enlarging port market areas through enhancing hinterland penetration capacity. Our findings show that if two rail-road terminals are located, one in Dosso and the other one in Parakou, it will allow a saving of about 112 million euro, promote local economies and sustainability. [less ▲]

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See detailThe inventory-routing problem of returnable transport items with time windows and simultaneous pickup and delivery in closed-loop supply chains
Iassinovskaia, Galina; Limbourg, Sabine ULiege; RIANE, Fouad

in International Journal of Production Economics (2017), (183), 570-582

Reducing environmental impact, related regulations and potential for operational benefits are the main reasons why companies share their returnable transport items (RTIs) among the different partners of a ... [more ▼]

Reducing environmental impact, related regulations and potential for operational benefits are the main reasons why companies share their returnable transport items (RTIs) among the different partners of a closed-loop supply chain. In this paper, we consider a producer, located at a depot, who has to distribute his products packed in RTIs to a set of customers. Customers define a time window wherein the service can begin. The producer is also in charge of the collection of empty RTIs for reuse in the next production cycle. Each partner has a storage area composed of both empty and loaded RTI stock, as characterized by initial levels and maximum storage capacity. As deliveries and returns are performed by a homogeneous fleet of vehicles that can carry simultaneously empty and loaded RTIs, this research addresses a pickup and delivery inventory-routing problem within time windows (PDIRPTW) over a planning horizon. A mixed-integer linear program is developed and tested on small-scale instances. To handle more realistic large-scale problems, a cluster first-route second matheuristic is proposed. [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 (2017)

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 detailDe nouveaux terminaux à conteneurs en Belgique : hasard ou nécessité ?
Jourquin, Bart; Limbourg, Sabine ULiege

in Reflets et perspectives de la vie économique (2017)

En parodiant le titre d’un célèbre essai de Jacques Monod (1971), cet article tente de synthétiser un certain nombre de travaux de recherche qui, ces dernières années, ont examiné la pertinence d’ouvrir ... [more ▼]

En parodiant le titre d’un célèbre essai de Jacques Monod (1971), cet article tente de synthétiser un certain nombre de travaux de recherche qui, ces dernières années, ont examiné la pertinence d’ouvrir (ou non) de nouveaux terminaux à conteneurs sur le territoire belge. Ces terminaux sont des éléments essentiels dans un réseau de transport intermodal, mais ils ont un coût. Pour être rentable, le coût additionnel engendré par les transbordements doit être compensé par un gain dans les coûts de transport. Or, rien ne garantit a priori que l’opération soit rentable, alors que l’ouverture de nouveaux terminaux est très régulièrement présentée comme une opportunité incontournable dans les discours politiques préélectoraux… [less ▲]

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See detailCan Autonomous Vehicles Reduce Car Mobility? Evidence from a Stated Adaptation Experiment in Belgium
Cools, Mario ULiege; Rongy, Caroline; Limbourg, Sabine ULiege

in Transportation Research Board Annual Meeting. Compendium of Papers (2017)

From literature, it is clear that the discussion about the potential benefits and drawbacks of autonomous vehicles is not finished. In order to provide insight into this discussion, this paper ... [more ▼]

From literature, it is clear that the discussion about the potential benefits and drawbacks of autonomous vehicles is not finished. In order to provide insight into this discussion, this paper investigates different attitudes with respect to different key factors for the deployment of system of autonomous taxis. To this end, a stated adaptation experiment was carried out in Belgium in March 2016. To investigate which factors influence the variables of interest, i.e. (i) the number of minutes one is prepared to wait before an autonomous taxi picks up the person, (ii) the ownership of a private car when autonomous taxis are available, (iii) the willigness to share an autonomous taxi, (iv) the permittance for the autonomous vehicle to take a detour when it is beneficial for the society, and (v) the willigness to share your private agenda to ensure a timely autonomous taxi, different regression models are constructed. The results show that the considered explanatory factors only capture a small part of the variability five variables of interest. This is as signal that market segmentation might be very challenging. Besides, this is an indication that a broader range of factors should be included such as life-style factors and psychological constructs. Finally, this acknowledges the need for some skepticism with regard to the potential benefits of autonomous vehicles. The results are interesting for providing realistic boundaries and cross-classification in further simulation studies that look at the benefits of autonomous vehicles. [less ▲]

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See detailIterated local search for the capacitated vehicle routing problem with sequence-based pallet loading and axle weight constraints
Pollaris, Hanne; Braekers, Kris; Caris, An et al

in Networks (2017)

In this article an Iterated Local Search algorithm for the capacitated vehicle routing problem with sequence-based pallet loading and axle weight constraints is presented. Axle weight limits impose a ... [more ▼]

In this article an Iterated Local Search algorithm for the capacitated vehicle routing problem with sequence-based pallet loading and axle weight constraints is presented. Axle weight limits impose a great challenge for transportation companies. Yet, the literature on the incorporation of axle weight constraints in vehicle routing models is very scarce. The effect of introducing axle weight constraints in a CVRP on total routing cost is analyzed. Results show that integrating axle weight constraints does not lead to a large cost increase. However, not including axle weight constraints in the planning process may induce major axle weight violations. [less ▲]

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