References of "Limbourg, Sabine"
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See detailA bi-objective model for the collaborative pickup anddelivery problem under time windows
Vidal, Laura ULiege; Limbourg, Sabine ULiege

Conference (2021, July 12)

Urban logistics faces challenges such as congestion and pollution, prompting innovative collaborative projects to emerge. With the growth of e-commerce, customers want faster and flexible service ... [more ▼]

Urban logistics faces challenges such as congestion and pollution, prompting innovative collaborative projects to emerge. With the growth of e-commerce, customers want faster and flexible service. Government incentives should, however, stress the need for a shift to greener delivery. In this sense, an intelligent platform for pooling and synchronizing urban logistics players’ activities is under development in Wallonia. This research focuses on a Collaborative Pickup and Delivery Problem under Time Windows through a bi-objective of minimizing total transportation cost and environmental impact associated with each transport mode. The model is tested on a real case within Wallonia (Belgium). A profit distribution model should also be set to share the gains among the logistics operators who collaborated equitably. This project should make it possible to prioritize the use of electric vehicles such as cargo bicycles in city centres, but also to consolidate inter-urban deliveries in order to maximize the use of the vehicles on the road. Consolidation should thus maximize the loading of vehicles, hence reducing empty trips. [less ▲]

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See detailCity logistics and smart delivery
Limbourg, Sabine ULiege

Conference (2021, March 17)

The current and expected growing number of people living and working in cities and the limited space available inside city centres implies a greater exchange of inbound and outbound freight flows between ... [more ▼]

The current and expected growing number of people living and working in cities and the limited space available inside city centres implies a greater exchange of inbound and outbound freight flows between city centres and their surrounding regions. Urban freight transports provide economic benefits to society but are also responsible for negative externalities such as congestion, air and water pollution, climate change, accidents and noise. Access restrictions are one of the most applied measures to control urban traffics in the city's specific areas. A growing use of urban trucks based on electric, hydrogen and hybrid technologies or non-motorized transport such as bikes reduces pollutant emissions, noise and road congestion by making night deliveries and avoiding morning and afternoon peak periods. This seminar's objective is to discuss how to efficiently distribute shipments to customers from several cities by a freight transport operator. This delivery company has several vehicles to carry products to customers or small depots located at different cities' points. We consider the whole distribution network, allowing us to make decisions at firm, delivering companies and small depots level (Aguayo et al., 2020). Then we consider a platform bringing together several freight transport operators. Freight bundling is a central characteristic of the systems in focus. Besides, pricing decisions can be simultaneously integrated by extending a bilevel programming formulation (Tawfik and Limbourg, 2019). Finally, Unmanned Aerial Vehicle, which is also known as a drone, is examined as a possible way to facilitate biomedical transportation. We deal with the drone network design problem for biomedical material transportation. Four location models are developed and applied to Brussels and its periphery with respect to the associated market in terms of biomedical product flows. In the context of separate case studies of scenario-based analysis, the experiments show that charging stations is useful for extending the mission ranges and gaining market share. The results also show the possibility of gradually implementing the bases without requiring any significant changes, such as closing a base (Dhote and Limbourg, 2020). [less ▲]

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See detailThe impact of axle weight constraints on the deployment of a mixed-fleet in vehicle routing decisions
Pollaris, Hanne; Janssens, Gerrit K; Braekers, Kris et al

in IJTTE. International Journal for Traffic and Transport Engineering (2021), 11(3),

A vehicle routing problem (VRP), using a mixed fleet of vehicles, with sequence-based pallet loading and axle weight constraints is introduced. The effect of the integration of axle weight constraints in ... [more ▼]

A vehicle routing problem (VRP), using a mixed fleet of vehicles, with sequence-based pallet loading and axle weight constraints is introduced. The effect of the integration of axle weight constraints in a Fleet Size and Mix VRP is analyzed by comparing the problem 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. Two scenarios are analyzed with different objective functions. In the first scenario, the objective aims to minimize total distance while in the second scenario the objective aims the minimization of total transport costs. An Iterated Local Search metaheuristic algorithm is used to solve the problem. The results indicate that the impact of axle weight constraints on the solution cost of a vehicle routing problem depends on the fleet composition. Therefore, decisions on the deployment of a mixed-size fleet may be influenced by the integration of axle weight constraints. [less ▲]

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See detailConnection corridors to alleviate biodiversity loss: conception through mathematical optimisation
Bebronne, Elodie ULiege; Limbourg, Sabine ULiege

Speech/Talk (2020)

Due to urbanisation, wildlife sees its natural habitats fragmented. The objective of the research is to apply operations research techniques to determine optimal corridors, linking separate protected ... [more ▼]

Due to urbanisation, wildlife sees its natural habitats fragmented. The objective of the research is to apply operations research techniques to determine optimal corridors, linking separate protected areas,with the objective to best preserve biodiversity. [less ▲]

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See detailMulti-echelon multi-product distribution network considering heterogeneous capacitated vehicles
Aguayo, Cristian; Amaya, Jorge; Limbourg, Sabine ULiege

Conference (2020, January 31)

The current and expected growing number of people living and working in cities, as well as the limited space available inside city centres, implies an always greater exchange of inbound and outbound ... [more ▼]

The current and expected growing number of people living and working in cities, as well as the limited space available inside city centres, implies an always greater exchange of inbound and outbound freight flows between city centres and their surrounding regions. Urban freight transports provide economic benefits to society but are also responsible for negative externalities such as congestion, air and water pollution, climate change, accidents and noise. They are more polluting than long-distance freight transports because of the increasing consumption of fuel due to the frequent stops on their delivery route. Moreover, due to traffic congestion, most of the transport vehicles are using alternative routes which are associated with a longer transport time, higher transport costs and negative impact on society and the quality of life. Regulatory measures are rules made by the city or further governmental authorities. Access restrictions are one of the most applied measures to control urban traffics in specific areas of the city. There are several types of access restrictions from time windows, emissions and noise limits to vehicle weight and size. Policy measures can be of various types such as the implementation of low emission zones, the introduction of cleaner vehicles or the encouragement to use non-motorized transport such as bikes. Measures related to land use planning and infrastructure are usually very cost-intensive and thus include long time planning and long implementations periods. These measures range from on-street as well as off-street loading zones to specific delivery zones and collecting points. Also, Urban Consolidation Centers (UCCs), inside and outside the city, are part of these measures related to land use planning. Over the last years, the idea of consolidation of goods has been downscaled; this idea is associated with micro-depots. The objective of this paper is to determine how to efficiently distribute various products made by small and medium firms to customers from different cities. Some of these firms have delivery vehicles. Besides, some delivery companies are available for collecting or picking up goods from different firms. These delivery companies have several vehicles which can carry products to customers or to small depots which can be located in different points in the cities. We will consider the whole \textit{distribution network}, allowing us to make decisions at firm, delivering companies and satellite level. We propose a mixed-integer linear program for the specific case of a multi-echelon multi-product distribution network considering heterogeneous capacitated vehicles. The validity of this model is tested on small-scale instances. To solve problems of a more realistic scale, we develop a matheuristic. Acknowledgements With the support of Wallonie-Bruxelles International. [less ▲]

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See detailTime-Dependent Stochastic Vehicle Routing Problem with Random Requests: Application to online police patrol management in Brussels
Saint-Guillain, Michael; Paquay, Célia ULiege; Limbourg, Sabine ULiege

in European Journal of Operational Research (2020)

The Static and Stochastic Vehicle Routing Problem with Random Requests (SS-VRP-R) describes realistic operational contexts in which a fleet of vehicles has to serve customer requests appearing dynamically ... [more ▼]

The Static and Stochastic Vehicle Routing Problem with Random Requests (SS-VRP-R) describes realistic operational contexts in which a fleet of vehicles has to serve customer requests appearing dynamically. Based on a probabilistic knowledge about the appearance of requests, the SS-VRP-R seeks a priori sequences of vehicle relocations, optimizing the expected responsiveness to the requests. In this paper, an existing computational framework, based on recourse strategies, is adapted to meet the objectives of the SS-VRP-R. The resulting models are applied to a real case study of the management of police units in Brussels. In this context, the expected average response time is minimized. To cope with the reality of the urban context, a time-dependent variant is also studied (TD-SS-VRP-R) in which the travel time between two locations is a function that depends on the departure time at the first location. Experiments confirm the contribution and the adaptability of the recourse strategies to a real-life, complex operational context. Provided an adequate solution method, simulation-based results show the high quality of the a priori solutions designed, even when compared to those designed by field experts. Finally, the experiments provide evidence that there is no potential gain in considering time-dependency in such an operational context. [less ▲]

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See detailDesigning unmanned aerial vehicle networks for biological material transportation - The case of Brussels
Dhote, jeremy; Limbourg, Sabine ULiege

in Computers & Industrial Engineering (2020)

Unmanned Aerial Vehicles (UAVs) may solve, or at least reduce, the negative impacts of road transport such as accidents, pollution and congestion. The objective of this paper is to design UAV networks for ... [more ▼]

Unmanned Aerial Vehicles (UAVs) may solve, or at least reduce, the negative impacts of road transport such as accidents, pollution and congestion. The objective of this paper is to design UAV networks for biomedical material transportation in line with the Drone4Care project. Political, Economic, Social, Technological, Environmental, Legal (PESTEL) analysis provides an overview of the macro-environmental factors that should be considered. To identify the internal and external factors that are favourable and unfavourable to achieve this objective, Strengths, Weaknesses, Opportunities and Threats (SWOT) analysis is also performed. The raised issues are translated into a number of quantifiable scenario elements containing the most plausible up-coming events that may impact the future of UAV networks. Four location models are developed and applied to the city of Brussels and its periphery with respect to the associated market in terms of biomedical product flows (blood units or medical samples that are transported between hospitals, laboratories, and blood transfusion centres). In the context of separate case studies of scenario-based analysis, the experiments show that the use of charging stations is useful to extend the mission ranges and to gain market share. The results also show the possibility of gradually implementing the bases without requiring any major changes such as closing a base. [less ▲]

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See detailScenario-based analysis for intermodal transport in the context of service network design models
Tawfik, Christine Maher Fouad ULiege; Limbourg, Sabine ULiege

in Transportation Research Interdisciplinary Perspectives (2019), 2

In this paper, we discuss service network design models for consolidation-based freight transport systems. Two path-based formulations are presented for the domestic and long-corridor cases, respectively ... [more ▼]

In this paper, we discuss service network design models for consolidation-based freight transport systems. Two path-based formulations are presented for the domestic and long-corridor cases, respectively. In the context of intermodal transport as a relevant application, the modelling frameworks are applied in Belgium-related case studies, in order to draw meaningful managerial insights. Several future scenarios are experimented by analysing a number of parameters that have been identified as significant operational factors and policy levers. The results underline the costly position of rail transport and a clear economic favouring of inland waterways (IWW), potentially attributed to the high rail fixed costs. Additionally, it is suggested that intermodal transport can benefit from rail subsidies, especially during the early stages of covering the market. Even in the best-case scenario, the resulting modal shares are far from reaching the figures desired for freight transport in the EU. Thus, more powerful instruments need to be implemented to promote greener transport schemes. [less ▲]

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See detailEffective Covering of Supplied Nanostores in Emerging Cities
Sabiri, Asmaa; Riane, Fouad; Limbourg, Sabine ULiege

in Fathi, M.; Khakifirooz, M.; Pardalos, P. (Eds.) Optimization in Large Scale Problems (2019)

The role of distribution in emerging markets is the same as everywhere else. Yet the distribution landscape in such markets is marked by a lack of uniformity and dominated by traditional distribution ... [more ▼]

The role of distribution in emerging markets is the same as everywhere else. Yet the distribution landscape in such markets is marked by a lack of uniformity and dominated by traditional distribution channels made of nanostores. The traditional small retailers need to be visited and supplied very frequently (High Frequency Stores) which turns to be costly and time consuming. An effective and efficient distribution system allows customers to buy what they want whenever they want to. In this chapter, we deal with a real-life application problem where a Moroccan company has to build an effective strategy to supply nanostores in a major city like Casablanca. The problem of concern is modeled as an assignment problem, combined with side constraints regarding profit potential balance, workload balance and disruption of pre-assignments. We adopt a multi-objective approach to a multiple traveling salesman problem. 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 detailHow can food loss and waste management achieve sustainable development goals?
Lemaire, Anaïs ULiege; Limbourg, Sabine ULiege

in Journal of Cleaner Production (2019), 234

The main purpose of this literature review is to establish a state of the art of food loss and waste management system that addresses the United Nations' Sustainable Development Goal number 12 ... [more ▼]

The main purpose of this literature review is to establish a state of the art of food loss and waste management system that addresses the United Nations' Sustainable Development Goal number 12: sustainable consumption and production. The paper constitutes a detailed summary of recent literature on the concepts, product categories, causes, solutions, and research challenges surrounding food loss and waste management. The contribution of this article is a new classification of the causes, solutions and research challenges, based on diverse existing classifications. Solutions for reducing food loss and waste include awareness raising, business process redesign, integrated supply chain models, redistribution, recovery, and disposal. Several research direction propositions came out of this literature review: developing standardised and up-to-date data collection and concept definitions; analysing the ‘awareness of the need’ concept in redistribution; studying consumer behaviour; examining the performance of local versus global logistics networks in terms of food loss and waste; and identifying the role of packaging in food loss and waste and greenhouse gas emission reduction. [less ▲]

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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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