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A home-care distributor had to decide whether to keep delivering in-house or outsource, and from which of two depots. A periodic inventory and routing model over a 12-week cycle, with service level verified by Monte Carlo.
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A complete method and time study of a workstation at Van Hool: critically studying how the work is actually done, measuring it by direct time study and work sampling, and designing an optimized standard work method with a defensible standard time.
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An audit of Milliken Europe’s chemical division in Ghent against the seven principles of supply chain management, with a chapter on variability and three concrete changes to propose.
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Designing a greenfield plant for a manufacturer of 21,000 electric golf carts a year: takt time and line balancing for a high-customization line, a kitting supermarket for parts supply, the facility layout, and a discrete-event simulation to check the whole thing holds together.
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Documenting the existing packaging policy for Atlas Copco’s AIRnet and piping components, then optimizing it with a mixed-integer model and metaheuristics, with the aim of halving annual distribution and storage costs.
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Planning daily routes for the mobile unit of the Belgian police, where the objective is not just to cover the beat but to keep the route unpredictable, so that patterns cannot be learned and exploited.
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A school choice assignment problem for a real district: place 8,500 students across 86 schools within capacity while honouring ranked preferences, a protected share of places for priority students, and the rule that children with relatives at a school get preference there.
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The central research line of my PhD: designing a semi-flexible feeder bus service that sits between the predictability of a traditional route and the efficiency of a fully flexible on-demand service, together with the exact and heuristic methods needed to operate it.
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A capacitated school bus routing problem with accessibility constraints, solved on real De Lijn data for the municipalities of Diest and Gavere. A good illustration of how a hard routing problem looks once mobility constraints are added.
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A systematic review that classifies every demand-responsive public bus system in the literature by its degree of responsiveness, and shows how few semi-flexible many-to-one systems have been studied in the real-time setting.
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A case study that takes the semi-flexible feeder service out of the benchmark and into the real world, simulating a deployment along the N177 between Boom and central Antwerp against the existing De Lijn bus lines.
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A new type of metaheuristic framework, developed during my PhD, in which an outer simulated annealing searches the parameter space of an inner semi-random greedy constructive heuristic, instead of searching the solution space directly.
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A VLAIO-funded development project delivering an automatic dispatching module for non-emergency medical transport, which builds and continuously re-optimises the daily trip schedule and crew assignments, with human dispatchers always in the loop.
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A PRISMA-based scoping review of 81 operations research studies on planning non-emergency medical transportation, extracted with a reproducible three-LLM pipeline, which shows how far the field still is from operational reality.
Published in Transportation Research Part C: Emerging Technologies, 2021
This paper proposes a large neighborhood search algorithm to optimize a demand-responsive feeder service, balancing efficiency and passenger convenience.
Recommended citation: Galarza Montenegro, et al. (2021). "A large neighborhood search algorithm to optimize a demand-responsive feeder service." Transportation Research Part C: Emerging Technologies, 127, 103102. https://doi.org/10.1016/j.trc.2021.103102
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Published in Networks, 2022
This article introduces a column generation approach for optimizing the demand-responsive feeder service problem.
Recommended citation: Galarza Montenegro, et al. (2022). "A column generation algorithm for the demand-responsive feeder service." Networks, 80(3), 22095. https://doi.org/10.1002/net.22095
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Published in Transportation Research Part C: Emerging Technologies, 2022
This paper presents a comprehensive survey on demand-responsive public bus systems, reviewing models, algorithms, and practical applications. This was a joint work with other researchers as well.
Recommended citation: Vansteenwegen, et al. (2022). "A survey on demand-responsive public bus systems." Transportation Research Part C: Emerging Technologies, 137, 103573. https://doi.org/10.1016/j.trc.2022.103573
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Published in Transportmetrica A: Transport Science, 2023
This study examines a real-time dynamic feeder service with maximum headway constraints at mandatory stops.
Recommended citation: Galarza Montenegro, et al. (2023). "The real-time dynamic online feeder service with a maximum headway at mandatory stops." Transportmetrica A: Transport Science. https://doi.org/10.1080/23249935.2023.2227738
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Published in Networks, 2023
This paper presents a demand-responsive feeder service model incorporating maximum headway requirements at mandatory stops.
Recommended citation: Galarza Montenegro, et al. (2023). "A demand-responsive feeder service with a maximum headway at mandatory stops." Networks, 83(1), 22185. https://doi.org/10.1002/net.22185
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Published in 4OR, 2024
This PhD thesis abstract outlines the pursuit of optimal balance between neither too rigid nor too flexible services in demand-responsive bus service design.
Recommended citation: Bryan David Galarza Montenegro. (2024). "Towards the Goldilocks Zone of demand-responsive bus services." 4OR, 22. PhD Thesis Abstract. https://doi.org/10.1007/s10288-023-00546-4
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I attended the ICITE 2019 conference on intelligent transportation engineering at the National University of Singapore.
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Presentation of research on a demand-responsive feeder system combining mandatory and clustered optional bus stops at ORBEL 34.
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I gave a virtual presentation during the COVID 19 pandemic for ORBEL 35. The talk was about the modeling and optimizing a demand-responsive feeder service with a mix of mandatory and optional bus stops.
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Presentation of a large neighbourhood search algorithm designed to optimize a demand-responsive feeder service at EURO 31.
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In NORS 2021, I gave a talk on integrating frequency constraints in demand-responsive feeder services with mandatory stops.
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Invited to present at the KU Leuven CIB (Centre for Industrial Management / Traffic & Infrastructure) internal research seminar on multiple occasions (2019, 2021, and 2022). The talk focused on semi-flexible bus services, discussing models and optimization approaches for demand-responsive transit systems with both mandatory and optional stops.
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The ELAVIO 2022 summer school for young OR researchers. I also gave a presentation on a feeder service with maximum headway constraints at mandatory stops.
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In, MIC 2022, I gave a talk focusing on metaheuristics for optimizing a feeder service with maximum headway restrictions.
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Talk on dynamic feeder service models with maximum headway constraints to improve service quality at ORBEL 36.
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Presentation of working paper about enhancing demand-responsive feeder services through maximum headway constraints at mandatory stops, at CLAIO 2022.
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At IFORS 23, I presented my research about a real-time dynamic online feeder service, highlighting maximum headway constraints at mandatory stops.
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Presentation about an applied case of Non-Emergency Medical Transportation (NEMT) at the 2025 Beta Symposium.
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I was invited to give a seminar at the CORE research group in UC Louvain. I talked about an applied research project where I was the lead on.
Undergraduate course, University 1, Department, 2014
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Workshop, University 1, Department, 2015
This is a description of a teaching experience. You can use markdown like any other post.