dr. K. Gkiotsalitis (Konstantinos)

Konstantinos is Assistant Professor (Guest) at the Transport Engineering and Management (TEM) group, Department of Civil Engineering. His research focuses on public transport modeling, demand prediction, tactical/operational planning, traffic operations and data-driven optimization. From 2012-2018 he was conducting transportation R&D at NEC Laboratories Europe (Heidelberg, Germany) with a specific focus on EU and APAC markets.

He received his Ph.D. from the National Technical University of Athens on unveiling the mobility patterns of individuals and matching the transportation supply with the travel demand. He also received his bachelor's degree in Civil Engineering from the National Technical University of Athens (2010) and his MSc in Transport and Sustainable Development from Imperial College London and University College London (2012).

He has been involved in several EU and international projects on smart cities, urban mobility, public transport operations, MaaS and logistics and has several patent applications in the aforementioned areas. He is also an active member of the IEEE community and the Review Coordinator of the Transit Management and Performance committee (AP010) at the Transportation Research Board.

Professional Experience

2022-now: Assistant Professor (Guest), Transport Engineering and Management, Faculty of Engineering Technology, University of Twente
2018-2022: Assistant Professor, Transport Engineering and Management, Faculty of Engineering Technology, University of Twente
2015-2018: Research Scientist, Data Science Applications Group, NEC Laboratories Europe, Heidelberg, Germany
2012-2015: Research Associate, Intelligent Transport Systems Group, NEC Laboratories Europe, Heidelberg, Germany

Research Awards

2022 Moshe Givoni Prize for the best paper of the year in Transport Reviews. The paper: “Public transport planning adaption under the COVID-19 pandemic crisis: literature review of research needs and directions” is the 4th most-read article in the journal’s records.
ECOPOLIS award for the best BSc thesis in transportation engineering.

Business & Economics

# Bus
# Public Transport
# Travel Time

Engineering & Materials Science

# Scheduling
# Travel Time

Social Sciences

# Public Transport
# Time
# Travel

Faculty of Engineering Technology (ET), Transport Engineering and Management (TEM)

de Weert, Y. R. , Gkiotsalitis, K. , & van Berkum, E. C. (2024). Improving the scheduling of railway maintenance projects by minimizing passenger delays subject to event requests of railway operators. Computers & operations research, 165, Article 106580. Advance online publication. https://doi.org/10.1016/j.cor.2024.106580

Geurs, K. , Grigolon, A., Münzel, K. , Gkiotsalitis, K., Duran-Rodas, D., Büttner, B., Kirchberger, C., Pappers, J., Martinez ramirez, L., Graf, A., Hansel, J., Gkrava, R., & Klementschitz, R. (2024). The Smarthubs integration ladder: A conceptual model for the categorisation of shared mobility hubs. Transport reviews, 44(1), 112-139. https://doi.org/10.1080/01441647.2023.2239499

Gkiotsalitis, K., & Nikolopoulou, A. (2023). The multi-vehicle dial-a-ride problem with interchange and perceived passenger travel times. Transportation Research Part C: Emerging Technologies, 156, Article 104353. https://doi.org/10.1016/j.trc.2023.104353

Gkiotsalitis, K., Cats, O., Liu, T., & Bult, J. M. (2023). An exact optimization method for coordinating the arrival times of urban rail lines at a common corridor. Transportation Research Part E: Logistics and Transportation Review, 178, Article 103265. https://doi.org/10.1016/j.tre.2023.103265

Gkiotsalitis, K., Iliopoulou, C., & Kepaptsoglou, K. (2023). An exact approach for the multi-depot electric bus scheduling problem with time windows. European journal of operational research, 306(1), 189-206. https://doi.org/10.1016/j.ejor.2022.07.017

Gkiotsalitis, K., & Liu, T. (2023). Periodic Optimization of Bus Dispatching Times and Vehicle Schedules Considering the COVID-19 Capacity Limits: A Dutch Case Study. Transportation research record, 2677(4), 765-777. https://doi.org/10.1177/03611981221114119

Gkiotsalitis, K. (2023). Public Transport Optimization. Springer Nature. https://doi.org/10.1007/978-3-031-12444-0

Farahmand, Z. H. , Gkiotsalitis, K. , & Geurs, K. T. (2023). Predicting bus ridership based on the weather conditions using deep learning algorithms. Transportation Research Interdisciplinary Perspectives, 19, Article 100833. https://doi.org/10.1016/j.trip.2023.100833

Asgarpour, S. , Hartmann, A. , & Gkiotsalitis, K. (2023). Infrastructure investment planning through scenario-based system-of-systems modelling. Transportation planning and technology, 46(5), 527-572. https://doi.org/10.1080/03081060.2023.2196987

Filgueiras, M. , Gkiotsalitis, K., Yap, M., Cats, O., Lobo, A., & Ferreira, S. (2023). Bus Network Design and Frequency Setting in the Post-COVID-19 Pandemic: The Case of London. Journal of Transportation Engineering Part A: Systems, 149(4), Article 04023020. https://doi.org/10.1061/JTEPBS.TEENG-7176

Peer-reviewed Journal Publications

K. Gkiotsalitis, T. Liu, O. Cats, (2022). A review of public transport transfer synchronisation at the real time control phase, Transport Reviews, https://doi.org/10.1080/01441647.2022.2035014.
Gkiotsalitis, K., Schmidt, M., & van der Hurk, E. (2022). Subline frequency setting for autonomous minibusses under demand uncertainty. Transportation Research Part C: Emerging Technologies, 135, 103492, https://doi.org/10.1016/j.trc.2021.103492.
Alesiani, F., Ermis, G., & Gkiotsalitis, K. (2022). Constrained Clustering for the Capacitated Vehicle Routing Problem (CC-CVRP). Applied Artificial Intelligence, 1-25, https://doi.org/10.1080/08839514.2021.1995658.
Gkiotsalitis, K. (2022). Coordinating feeder and collector public transit lines for efficient MaaS services. EURO Journal on Transportation and Logistics, 11, 100057, https://doi.org/10.1016/j.ejtl.2021.100057.
Trommelen, W., Gkiotsalitis, K., & Van Berkum, E. C. (2021). Optimization Model for Rail Line Crossover Design Considering the Cost of Delay. Transportation Research Record, 03611981211062488, https://doi.org/10.1177/03611981211062488.
T. Liu, O. Cats, K. Gkiotsalitis (2021). A review of public transport transfer coordination at the tactical planning phase. Transportation Research Part C: Emerging Technologies, 133, 103450, https://doi.org/10.1016/j.trc.2021.103450
Z.H. Farahmand, K. Gkiotsalitis, K.T. Geurs (2021). Mobility-as-a-Service as a transport demand management tool: A case study among employees in the Netherlands. Case Studies on Transport Policy. https://doi.org/10.1016/j.cstp.2021.09.001
F. Nijland, K. Gkiotsalitis, E.C. van Berkum (2021). Improving railway maintenance schedules by considering hindrance and capacity constraints. Transportation Research Part C: Emerging Technologies, 126, 103108, https://doi.org/10.1016/j.trc.2021.103108
K. Gkiotsalitis (2021). Improving service regularity for high-frequency bus services with rescheduling and bus holding. Journal of Traffic and Transportation Engineering, https://doi.org/10.1016/j.jtte.2020.06.002
Y. de Weert, K. Gkiotsalitis (2021). A COVID-19 Public Transport Frequency Setting Model That Includes Short-Turning Options. Future Transportation, 1(1), 3-20. https://doi.org/10.3390/futuretransp1010002
K. Gkiotsalitis (2021). A model for modifying the public transport service patterns to account for the imposed COVID-19 capacity. Transportation Research Interdisciplinary Perspectives, vol. 9, 100336. https://doi.org/10.1016/j.trip.2021.100336
K. Gkiotsalitis, O. Cats (2021). Optimal frequency setting of metro services in the age of COVID-19 distancing measures. Transportmetrica A: Transport Science. https://doi.org/10.1080/23249935.2021.1896593
K. Gkiotsalitis, O. Cats (2021). At-stop control measures in public transport: Literature review and research agenda. Transportation research. Part E: Logistics and transportation review, 145, [102176]. https://doi.org/10.1016/j.tre.2020.102176
K. Gkiotsalitis, O. Cats (2020). Timetable Recovery After Disturbances in Metro Operations: An Exact and Efficient Solution. IEEE Transactions on Intelligent Transportation Systems. https://doi.org/10.1109/TITS.2020.3041151
K. Gkiotsalitis, O. Cats (2020). Public transport planning adaption under the COVID-19 pandemic crisis: literature review of research needs and directions. Transport Reviews. https://doi.org/10.1080/01441647.2020.1857886
S.Y. ten Have, K. Gkiotsalitis, K.T. Geurs (2020). "Investigating the Future of Ultrafast Charging: A Choice Experiment in the Netherlands." World Electric Vehicle Journal, 11(4), 70. https://doi.org/10.3390/wevj11040070
X. Karekla, K. Gkiotsalitis, N. Tyler (2020). "The impact of a passenger-safety-driven acceleration limit on the operation of a bus service", Accident Analysis and Prevention, vol. 148, 105790. https://doi.org/10.1016/j.aap.2020.105790
K. Gkiotsalitis, E.C. van Berkum (2020). "An analytic solution for real-time bus holding subject to vehicle capacity limits", Transportation Research Part C: Emerging Technologies, vol. 121, 102815, 1-23.
Gkiotsalitis, K. (2020). "Stop-skipping in rolling horizons". Transportmetrica A: Transport Science, 1-29. https://doi.org/10.1080/23249935.2020.1798554
Gkiotsalitis, K. (2020). "Bus scheduling considering trip-varying travel times, vehicle availability and capacity". IET Intelligent Transport Systems. https://doi.org/10.1049/iet-its.2019.0725
K. Gkiotsalitis (2020) "Bus holding of electric vehicles with scheduled charging times", IEEE Transactions on Intelligent Transportation Systems, doi: 10.1109/TITS.2020.2994538.
B.B.W. Schasfoort, K. Gkiotsalitis, O.A.L. Eikenbroek, E.C. van Berkum (2020): "A dynamic model for real-time track assignment at railway yards", Journal of Rail Transport Planning & Management, 100198.
K. Gkiotsalitis (2020): "A model for the periodic optimization of bus dispatching times", Applied Mathematical Modelling, vol. 82, 785-801.
K. Gkiotsalitis, A. Stathopoulos (2020): "Predicting Traveling Distances and Unveiling Mobility and Activity Patterns of Individuals from Multisource Data", Journal of Transportation Engineering, Part A: Systems, 146(5).
K. Gkiotsalitis, E.C. van Berkum (2020): "An exact method for the bus dispatching problem in rolling horizons", Transportation Research Part C: Emerging Technologies, vol. 110, 143-165.
K. Gkiotsalitis (2019): "Bus rescheduling in rolling horizons for regularity-based services", Journal of Intelligent Transportation Systems, Technology, Planning, and Operations.
K. Gkiotsalitis, O.A.L. Eikenbroek, O. Cats (2019): "Robust network-wide bus scheduling with transfer synchronizations", IEEE Transactions on ITS, vol. 21, issue 11, 4582-4592.
K. Gkiotsalitis, F. Alesiani (2019): "Robust timetable optimization for bus lines subject to resource and regulatory constraints", Transportation Research Part E: Logistics and Transportation Review, vol. 128, 30-51.
K. Gkiotsalitis, O. Cats (2019): "Multi-constrained bus holding control in time windows with branch and bound and alternating optimization", Transportmetrica B: Transport Dynamics, vol.7, issue 1, 1258-1285.
K. Gkiotsalitis (2019): "Robust Stop-Skipping at the Tactical Planning Stage with Evolutionary Optimization", Transportation Research Record, 2673(3), 611-623.
K. Gkiotsalitis, Z. Wu, O. Cats (2019): "A cost-minimization model for bus fleet allocation featuring the tactical generation of short-turning and interlining options", Transportation Research Part C: Emerging Technologies, (98), 14-36.
K. Gkiotsalitis, N. Maslekar (2018): "Towards transfer synchronization of regularity-based bus operations with sequential hill-climbing", Public Transport, 1-27.
K. Gkiotsalitis, N. Maslekar (2018): "Multiconstrained timetable optimization and performance evaluation in the presence of travel time noise", Journal of Transportation Engineering, Part A: Systems, vol. 144, issue 9.
K. Gkiotsalitis, O. Cats (2018): "Reliable frequency determination: Incorporating information on service uncertainty when setting dispatching headways", Transportation Research Part C: Emerging Technologies 88, 187-207.
K. Gkiotsalitis, R. Kumar (2018): "Bus operations scheduling subject to resource constraints using evolutionary optimization", Informatics, vol.5, issue 1.
K. Gkiotsalitis, A. Stathopoulos (2016): "Joint leisure travel optimization with user-generated data via perceived utility maximization", Transportation Research Part C: Emerging Technologies 68, 532-548.
K. Gkiotsalitis, N. Maslekar (2016): "Dynamic Bus Operations Optimization with REFLEX", NEC Journal of Artificial Intelligence, vol. 69, no 1, 69-72.
K. Gkiotsalitis, A. Stathopoulos (2016): "Demand-Responsive Public Transportation Rescheduling for adjusting to the Joint Leisure Activity Demand", International Journal of Transportation Science and Technology (IJTST), Elsevier, vol. 5, issue 2, 68-82.
K. Gkiotsalitis, A. Stathopoulos (2015): "A utility-maximization model for retrieving users' willingness to travel for participating in activities from big-data", Transportation Research Part C: Emerging Technologies 58, 265-277.
K. Gkiotsalitis, A. Stathopoulos (2015): "A mobile application for real-time multimodal routing under a set of users' preferences", Journal of Intelligent Transportation Systems 19 (2), 149-166.
AHF Chow, Y Li, K Gkiotsalitis (2015): "Specifications of fundamental diagrams for dynamic traffic modeling", Journal of Transportation Engineering 141 (9), 04015015.
K Gkiotsalitis, AHF Chow (2014): "Significance of fundamental diagrams to first-order macroscopic traffic modelling", International Journal of Transportation 2 (2), 15-32.

Book Chapters

K.T. Geurs, K. Gkiotsalitis, T. Fioreze, G. Visser, M. Veenstra (2018): "The potential of a Mobility-as-a-Service platform in a depopulating area in the Netherlands: An exploration of small and big data", Population Loss-The role of Transportation and Other Issues, 55-79.
K. Gkiotsalitis, A. Stathopoulos (2015): "Optimizing Leisure Travel: Is BigData Ready to Improve the Joint Leisure Activities Efficiency?", Engineering and Applied Sciences Optimization, 53-71.

Conferences

E. Gulcin, F. Alesiani, K. Gkiotsalitis (2021): "Optimization of Collection and Consolidation Operations in Cross-Border Multi-modal Distribution Networks", 24th IEEE International Conference on Intelligent Transportation Systems
K. Gkiotsalitis (2021): "The Dial-A-Ride Problem considering the in-vehicle crowding inconvenience due to COVID-19", 24th IEEE International Conference on Intelligent Transportation Systems
J. Voorhorst, K. Gkiotsalitis (2020): "Scheduling bus holding times in time horizons considering transfer synchronization and service regularity", 23rd IEEE International Conference on Intelligent Transportation Systems
OAL Eikenbroek, K Gkiotsalitis (2020): "Robust rescheduling and holding of autonomous buses intertwined with collector transit lines", 23rd IEEE International Conference on Intelligent Transportation Systems
K. Gkiotsalitis (2020): "Periodic Stop Skipping: NP-hardness and computational limitations", Transportation Research Board (TRB) 99th Annual Meeting.
K. Gkiotsalitis (2020): "Bus Holding of Electric vehicles in rolling horizons", Transportation Research Board (TRB) 99th Annual Meeting.
X. Karekla, K. Gkiotsalitis (2020): "Operational characteristics of a bus service and their modification due to a safety-driven acceleration limit", Transportation Research Board (TRB) 99th Annual Meeting.
K Gkiotsalitis, OAL Eikenbroek, O Cats (2020): "Robust bus scheduling considering transfer synchronizations", Transportation Research Board (TRB) 99th Annual Meeting.
K Gkiotsalitis, OAL Eikenbroek, O Cats (2020): "An exact method for real-time rescheduling after disturbances in metro lines", Transportation Research Board (TRB) 99th Annual Meeting.
K Gkiotsalitis (2020): "Bus Operations Optimization: A Literature Review on Bus Holding, Rescheduling and Stop-skipping", Transportation Research Board (TRB) 99th Annual Meeting.
K. Gkiotsalitis, E.C. van Berkum (2020): "A model for real-time bus holding subject to vehicle capacity limits", Transportation Research Board (TRB) 99th Annual Meeting.
B.B.W. Schasfoort, K. Gkiotsalitis, O.A.L. Eikenbroek, E.C. van Berkum (2020): "A dynamic model for real-time track assignment at railway yards", Transportation Research Board (TRB) 99th Annual Meeting.
K. Gkiotsalitis, O. Cats (2019): "Bus holding control of running buses in time windows", at the 98th Annual Meeting of the Transportation Research Board.
K. Gkiotsalitis, Z. Wu, O. Cats (2019): "Bus allocation to short-turning and interlining lines", at the 98th Annual Meeting of the Transportation Research Board.
K. Gkiotsalitis (2019): "Robust stop-skipping at the tactical planning stage with Evolutionary Optimization", at the 98th Annual Meeting of the Transportation Research Board.
K. Gkiotsalitis, F. Alesiani (2018): "Resilient Bus Dispatching Times by Coupling Monte Carlo Evaluations with a Genetic Algorithm", 21st International IEEE Conference on Intelligence Transport Systems.
F. Alesiani, K. Gkiotsalitis (2018): "Reinforcement Learning-Based Bus Holding for High-Frequency Services", 21st International IEEE Conference on Intelligence Transport Systems.
K. Gkiotsalitis, O. Cats (2018): "Network-wide synchronized scheduling of public transport services", hEART 2018: 7th Symposium of the European Association for Research in Transportation.
K. Gkiotsalitis (2018): "Rolling-horizon optimization of the bus holding problem with sequential hill climbing", at the 97th Annual Meeting of the Transportation Research Board.
K. Gkiotsalitis, Z. Wu, O. Cats (2017): "Tactical service design and vehicle allocation optimization", hEART 2017: 6th Symposium of the European Association for Research in Transportation.
K. Gkiotsalitis, O. Cats (2017): "Exact optimization of Bus Frequency Settings considering Demand and Trip time variations", at the 96th Annual Meeting of the Transportation Research Board.
K. Gkiotsalitis, N. Maslekar (2017): "Sequential Evolutionary Optimization for improving regularity-based bus services", at the 96th Annual Meeting of the Transportation Research Board.
K. Gkiotsalitis, N. Maslekar (2015): "Improving Bus Service Reliability with Stochastic Optimization", 18th International IEEE Conference on Intelligent Transport Systems (ITSC), 2794-2799.
K. Gkiotsalitis, F. Alesiani (2014): "Opportunistic solution-space reduction techniques for reducing the time complexity of Dynamic Speed Control with microsimulation on motorways", 17th International IEEE Conference on Intelligent Transport Systems (ITSC), 1788-1795.
K. Gkiotsalitis, F. Alesiani, R. Baldessari (2014): "Educated rules for the prediction of human mobility patterns based on sparse social media and mobile phone data", Transportation Research Board, 93rd Annual Meeting.
K. Gkiotsalitis, A. Alexandrou (2014): "Mobility demand prediction in urban scenarios through multi-source, user-generated data", 18th Pan-American conference of traffic and transportation engineering (PANAM)
F. Alesiani, K. Gkiotsalitis, R. Baldessari (2014): "A probabilistic activity model for predicting the mobility patterns of homogeneous social groups based on social network data", Transportation Research Board, 93rd Annual Meeting.

Patents

K. Gkiotsalitis, F. Alesiani, N. Maslekar (2018): "Method and system for providing demand-responsive dispatching of a fleet of transportation vehicles, and a mobility-activity processing module for providing a mobility trace database", US Patent 9,953,539, 2018.
K. Gkiotsalitis, Z. Wu, O. Cats (2018): "Method for route optimization for demand responsive transportation", US Patent App. 15/920,645, 2018.
K. Gkiotsalitis, O. Cats (2018): "Transportation system and method for allocating frequencies of transit services therein", US Patent App. 15/439,979, 2018.
K. Gkiotsalitis, N. Maslekar (2016): "Method for providing configuration information for a system comprising a plurality of moving objects", WO/2016/155790, 2016.
Gkiotsalitis, F. Alesiani (2015): "Method and computer program product for accurate motorway speed control", WO Patent WO2015049064 A1, 2015.
Gkiotsalitis, N. Maslekar (2015): "Dynamic Fleet Routing", WO Patent WO/2015/154, 2015.
K. Gkiotsalitis, F. Alesiani, R. Baldessari (2014): "Method and system for predicting mobility demand of users", WO2014187476 A1, 2014.

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