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Mohammad Sadrani
Department of Civil, Geo and Environmental Engineering, Technical University of Munich, Munich 80333, Germany

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Journal article
Published: 08 August 2021 in European Journal of Operational Research
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Urban public transportation agencies sometimes have to operate mixing vehicles of different sizes on their routes, due to resource limitations or historical reasons. Services with different passenger-carrying capacities are provided to passengers during a mixed-fleet operation. A fundamental question arising here is how to optimally deploy a given fleet of different bus sizes to provide services that minimize passenger waiting time. We formulate a mixed-fleet vehicle dispatching problem as a Mixed-Integer Nonlinear Programming (MINLP) model to optimize dispatching schemes (dispatching orders and times) when a given set of buses of different sizes are available to serve demand along a route. The objective is to minimize the average passenger waiting time under time-dependent demand volumes. Stochastic travel times between stops and vehicle capacity constraints (i.e., introducing extra waiting time due to denied boarding) are explicitly modeled. A Simulated Annealing (SA) algorithm coupled with a Monte Carlo simulation framework is developed to solve large real-world instances in the presence of stochastic travel times. Results show that, in addition to dispatching headway, bus dispatching sequence can strongly affect waiting times under a mixed-fleet operation. Indeed, with an optimal dispatching sequence, a more accurate adjustment of supply to demand is possible in accordance with time-dependent demand conditions, and the total savings in waiting time are mainly driven by a further reduction in the number of passengers left behind. The optimality of uneven dispatching headways stems from two elements: having a mixed fleet and having localized peaks on demand that make buses run full.

ACS Style

Mohammad Sadrani; Alejandro Tirachini; Constantinos Antoniou. Vehicle dispatching plan for minimizing passenger waiting time in a corridor with buses of different sizes: Model formulation and solution approaches. European Journal of Operational Research 2021, 1 .

AMA Style

Mohammad Sadrani, Alejandro Tirachini, Constantinos Antoniou. Vehicle dispatching plan for minimizing passenger waiting time in a corridor with buses of different sizes: Model formulation and solution approaches. European Journal of Operational Research. 2021; ():1.

Chicago/Turabian Style

Mohammad Sadrani; Alejandro Tirachini; Constantinos Antoniou. 2021. "Vehicle dispatching plan for minimizing passenger waiting time in a corridor with buses of different sizes: Model formulation and solution approaches." European Journal of Operational Research , no. : 1.

Journal article
Published: 06 August 2020 in Smart Cities
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Efficient and reliable mobility pattern identification is essential for transport planning research. In order to infer mobility patterns, however, a large amount of spatiotemporal data is needed, which is not always available. Hence, location-based social networks (LBSNs) have received considerable attention as a potential data provider. The aim of this study is to investigate the possibility of using several different auxiliary information sources for venue popularity modeling and provide an alternative venue popularity measuring approach. Initially, data from widely used services, such as Google Maps, Yelp and OpenStreetMap (OSM), are used to model venue popularity. To estimate hourly venue occupancy, two different classes of model are used, including linear regression with lasso regularization and gradient boosted regression (GBR). The predictions are made based on venue-related parameters (e.g., rating, comments) and locational properties (e.g., stores, hotels, attractions). Results show that the prediction can be improved using GBR with a logarithmic transformation of the dependent variables. To investigate the quality of social media-based models by obtaining WiFi-based ground truth data, a microcontroller setup is developed to measure the actual number of people attending venues using WiFi presence detection, demonstrating that the similarity between the results of WiFi data collection and Google “Popular Times” is relatively promising.

ACS Style

Stanislav Timokhin; Mohammad Sadrani; Constantinos Antoniou. Predicting Venue Popularity Using Crowd-Sourced and Passive Sensor Data. Smart Cities 2020, 3, 818 -841.

AMA Style

Stanislav Timokhin, Mohammad Sadrani, Constantinos Antoniou. Predicting Venue Popularity Using Crowd-Sourced and Passive Sensor Data. Smart Cities. 2020; 3 (3):818-841.

Chicago/Turabian Style

Stanislav Timokhin; Mohammad Sadrani; Constantinos Antoniou. 2020. "Predicting Venue Popularity Using Crowd-Sourced and Passive Sensor Data." Smart Cities 3, no. 3: 818-841.