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The integrated on-demand bus routing problem Universiteit Antwerpen
In this work we analyze the performance of integrating a large-scale on-demand bus system with a high-frequency fixed line public transport network in an urban context. Given are a high-speed metro network, a set of real-time requests, a set of bus station locations and a fleet of fixed capacity minibuses. Requests have a set of possible departure/arrival bus stations within walking distance of the actual departure/arrival location and have to ...
Prepositioning can improve the performance of a dynamic stochastic on-demand public bus system Universiteit Antwerpen
This paper presents the first application of prepositioning in the context of the dynamic stochastic on-demand bus routing problem (DODBRP). The DODBRP is a large-scale dial-a-ride problem that involves bus station assignment and aims to minimize the total user ride time (URT) by simultaneously assigning passengers to alternative stations and determining optimal bus routes.In the DODBRP, transportation requests are introduced dynamically, and ...
The real-time dynamic online feeder service with a maximum headway at mandatory stops Universiteit Antwerpen
On the one hand, fully flexible demand-responsive feeder services efficiently tailor their service to passengers’ needs. Traditional services, on the other hand, offer predictability and easier cost control. This paper considers a semi-flexible feeder service that combines positive characteristics of both traditional and fully flexible services. There are two types of bus stops in this service. Mandatory bus stops have a maximum allowable ...
Optimization of a semiflexible demand-responsive feeder system in suburban areas using a memetic algorithm Universiteit Antwerpen KU Leuven
Traditional bus operations in suburban areas are inefficient due to their fixed routes and timetables. Since suburban operations deal with low demand spread in a large area, the service stays underused for most off-peak hours. In order to render the operation profitable and increase the number of passengers on each bus, operators reduce the frequency of the service, which results in an increase of passenger waiting time for the service. As a ...
A demand-responsive feeder service with a maximum headway at mandatory stops Universiteit Antwerpen
Conflict-free routing of workstation-capacitated tow trains for assembly line feeding optimization in just-in-time Universiteit Antwerpen
The time-window strategy in the online order batching problem Universiteit Antwerpen
When an order arrives at a warehouse it is usually assigned to a batch and a decision is made on how long to wait before assigning the batch to a picker and starting the picking tour. If the idle time of the pickers is minimised, the batch is immediately assigned, and the picking starts. Alternatively, if a time window is introduced, other orders may arrive, and more efficient batches may be formed. The method to decide how long to wait (the ...
A general deep reinforcement learning hyperheuristic framework for solving combinatorial optimization problems Universiteit Antwerpen
Many problem-specific heuristic frameworks have been developed to solve combinatorial optimization problems, but these frameworks do not generalize well to other problem domains. Metaheuristic frameworks aim to be more generalizable compared to traditional heuristics, however their performances suffer from poor selection of low-level heuristics (operators) during the search process. An example of heuristic selection in a metaheuristic framework ...
Design of experiments in humanitarian logistics Universiteit Antwerpen
Facility planning is one of the critical decisions faced by humanitarian managers. Some managerial implications have been offered in the literature, but these are commonly derived from simple sensitivity analyses on individual instance characteristics and/or using a single case study, and as such can be misleading as they ignore important interactions between many disaster properties. We carried out a large experimental study that analyses the ...