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

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 ULg

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 ULg; Caris, An; Limbourg, Sabine ULg

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 ULg

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

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 detailA best fit heuristic for the three-dimensional Bin Packing Problem with practical constraints from an air transportation application
Paquay, Célia ULg; Limbourg, Sabine ULg; Schyns, Michael ULg

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

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

This work considers the three-dimensional Multiple Bin Size Bin Packing Problem which consists in packing a set of cuboid boxes into containers of various shapes, while minimising unused space. The aim of the present work is to find good initial solutions in short computational times. In this purpose, a fast best fit heuristic able to manage the different constraints to be met in transportation is developed. 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 rule. During this phase, the fragility, stability and orientation of the boxes are taken into account, as well as the special shape of the bins and their weight capacity. The second phase considers the multiple types of available bins. If necessary, the best loading pattern identified is enhanced with respect to weight distribution in post processing. After parametrisation, computational experiments are performed on data sets specially designed for this application. The heuristic requires very 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 ULg

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 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 Network (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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See detailInstances for the 3D Multiple Bin Size Bin Packing Problem
Paquay, Célia ULg; Limbourg, Sabine ULg; Schyns, Michael ULg

Textual, factual or bibliographical database (2017)

The subject of this work is to solve the problem of packing a set of shipments (various cuboid boxes) into containers of various shapes without wasting loading space. All the boxes have to be loaded and ... [more ▼]

The subject of this work is to solve the problem of packing a set of shipments (various cuboid boxes) into containers of various shapes without wasting loading space. All the boxes have to be loaded and few are identical. As it is the case for all the packing problems, the packing has to satisfy geometry constraints: the items cannot overlap and have to lie entirely inside the bins. The richness of our application is to manage additional and common constraints: the bin weight capacity, the rotations of the boxes, the stability and the fragility of the boxes and the uniformity of the weight distribution inside the ULDs. The last constraint is crucial in air transportation: when ULDs are packed inside the airplane, the centre of gravity is computed assuming each ULD has a centre of gravity close to the geometrical centre of its basis. This type of constraints can be adapted to road transportation for the axle weight limits, which plays a key role since the weigh-in-motion systems become more common. [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 ULg; Limbourg, Sabine ULg; Schyns, Michael ULg

E-print/Working paper (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 detailRoad and intermodal transport performance: the impact of operational costs and air pollution external costs
Mostert, Martine ULg; Caris, An; Limbourg, Sabine ULg

in Research in Transportation Business & Management (2017)

The transportation of goods is essential for the economy, but it also contributes to air pollution which, in turn, affects human health. These negative impacts generate additional costs for society that ... [more ▼]

The transportation of goods is essential for the economy, but it also contributes to air pollution which, in turn, affects human health. These negative impacts generate additional costs for society that are not necessarily taken into account in public transportation policies and in private transportation decisions of companies and individuals. This leads to inefficient transportation systems where the social equilibrium is not reached. Intermodal transport is promoted by the European Commission to reduce these negative externalities. The objective of this paper is to analyze at a strategic level the effect on modal split between road, intermodal rail and intermodal inland waterway transport of several economic or environmental policies. An intermodal allocation model is applied to the Belgian case in order to identify the modal split changes between the single minimization of costs (operational or health-related external) and the introduction of additional road taxes. [less ▲]

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

in Flexible Services and Manufacturing Journal (2017)

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 detailLes problèmes “riches” de tournées de véhicules
Limbourg, Sabine ULg

Conference (2016, November 03)

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See detailLa compétitivité du transport intermodal
Limbourg, Sabine ULg

Conference (2016, November 02)

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See detailA Bilevel Design and Pricing Model for an Intermodal Service Network
Tawfik, Christine Maher Fouad ULg; Limbourg, Sabine ULg

Scientific conference (2016, September 09)

This work addresses the problem of jointly designing and pricing intermodal freight services during a medium-term planning horizon. Given the innate hierarchy in the problem, a bilevel program is ... [more ▼]

This work addresses the problem of jointly designing and pricing intermodal freight services during a medium-term planning horizon. Given the innate hierarchy in the problem, a bilevel program is considered where, at the upper level, an intermodal service provider seeks to maximize his profit through selecting the frequencies of his services and their associated prices, while at the lower level, target shipper firms choose to send their demands among the offered intermodal itineraries and the always available trucking competition. [less ▲]

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See detailOperational costs and externalities in optimal intermodal network design
Mostert, Martine ULg; Limbourg, Sabine ULg; Caris, An

Conference (2016, July 13)

Transportation of goods is essential for the economy but also leads to harmful impacts related to human health aspects. Intermodal transport is promoted by Europe to reduce these negative externalities ... [more ▼]

Transportation of goods is essential for the economy but also leads to harmful impacts related to human health aspects. Intermodal transport is promoted by Europe to reduce these negative externalities. The objective of this paper is to analyze at the strategic level how the flow repartition varies between three modes (road, intermodal rail and intermodal inland waterway) according to different implemented policies. A mathematical allocation model is developed and tested on the Belgian case study, in order to determine the observed changes between the single minimization of (operational or health-related external) costs and the introduction of additional road taxes. [less ▲]

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See detailOptimal returnable transport items management
Limbourg, Sabine ULg; Martin, Adeline; Paquay, Célia ULg

Conference (2016, July 11)

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. Face-to-face interviews with senior executives from seven companies involved in RTIs were conducted to gain a thorough understanding of how they manage the flow of RTIs as well as how they determine the number of RTIs needed in a fleet. Results indicate that RTIs managements are quite diverse, that some common beliefs about RTIs do not apply to all RTI types, and that research efforts are needed in the areas of RTI acquisition; warehouse layout, inventory routing problem; production planning and control; tracking and scheduling. [less ▲]

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See detailBRAIN-TRAINS: Scenario development to explore intermodal rail transport expansion in, from and towards Belgium
Troch, Frank; Vanelslander, Thierry; Sys, Christa et al

Conference (2016, July)

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See detailLa distribution par des véhicules électriques
Bay, Maud ULg; Limbourg, Sabine ULg

Scientific conference (2016, May 25)

The objective of vehicle routing problems is to design a set of efficient vehicle routes to provide goods from a depot to a set of customers satisfying specific constraints. Classical variants of these ... [more ▼]

The objective of vehicle routing problems is to design a set of efficient vehicle routes to provide goods from a depot to a set of customers satisfying specific constraints. Classical variants of these problems consider that routes are performed by internal combustion engine vehicles. These vehicles have a long and easy-to-restore driving range. However, due to the short driving range, long battery recharging times and the limited availability of charging infrastructure, routing algorithms for EV need to be developped. Maximizing the driving range of the vehicle leads to an examination of the main factors in energy consumption which are: the mass of the vehicle and its payload, engine efficiency, vehicle speed, the drive pattern, road grade, and vehicle recharge ability while driving. Results from this research will provide an optimal management of urban logistics where night delivery, through the use of those silent vehicles, remains one of the main benefits. [less ▲]

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