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A bi-level framework for heterogeneous fleet sizing of ride-hailing services considering an approximated mixed equilibrium between automated and non-automated traffic

Fan, Q. (author), van Essen, J.T. (author), Correia, Gonçalo (author)

Ride-hailing companies will face the emergence and gradual expansion of AVs-only zones in urban areas where only automated vehicles (AVs) are allowed to circulate. When owning a mixed fleet (automated and conventional taxis), a ride-hailing company has to determine the optimal fleet size as a function of the gradually expanding coverage of...

journal article 2024

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Required test durations for converged short-term wave and impact extreme value statistics — Part 1: Ferry dataset

van Essen, S.M. (author), Scharnke, Jule (author), Seyffert, Harleigh C. (author)

For the design of maritime structures in waves, the extreme values of responses such as motions and wave impact loads are required. Waves and wave-induced responses are stochastic, so such responses should always be related to a probability. This information is not easy to obtain for strongly non-linear responses such as wave impact forces....

journal article 2023

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Hybrid differential evolution algorithm for the resource constrained project scheduling problem with a flexible project structure and consumption and production of resources

van der Beek, T. (author), Souravlias, D. (author), van Essen, J.T. (author), Pruyn, J.F.J. (author), Aardal, K.I. (author)

The resource constrained project scheduling problem with a flexible project structure and consumption and production of resources, involves making a selection of activities and scheduling these activities in order to minimize the makespan, subject to precedence and resource constraints. Since finding a feasible selection of activities is NP...

journal article 2023

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Required test durations for converged short-term wave and impact extreme value statistics–Part 2: Deck box dataset

Scharnke, Jule (author), van Essen, S.M. (author), Seyffert, Harleigh C. (author)

In the assessment of wave-in-deck loads for new and existing maritime structures typically model tests are carried out. To determine the most critical conditions and measure sufficient impact loads, a range of sea states and various seeds (realisations) for each sea state are tested. Based on these measurements, probability distributions can...

journal article 2023

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Finding Dangerous Waves-Review of Methods to Obtain Wave Impact Design Loads for Marine Structures

van Essen, S.M. (author), Seyffert, Harleigh C. (author)

Green water and slamming wave impacts can lead to severe damage or operability issues for marine structures. It is therefore essential to consider their probability and loads in design. This is difficult, as impacts are both hydrodynamically complex and relatively rare. The complexity requires high-fidelity modeling (experiments or CFD),...

journal article 2023

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Optimising fleet sizing and management of shared automated vehicle (SAV) services: A mixed-integer programming approach integrating endogenous demand, congestion effects, and accept/reject mechanism impacts

Fan, Q. (author), van Essen, J.T. (author), Correia, Gonçalo (author)

Shared automated vehicles (SAV) are expected to benefit the sustainable development of urban regions and alleviate the negative impacts brought by the increasing number of private cars. In this paper, we envision a future scenario where non-pooled SAVs replace private cars and provide public on-demand mobility services to satisfy the mobility...

journal article 2023

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Improving the Clinical Interpretation of Transcutaneous Carbon Dioxide and Oxygen Measurements in the Neonatal Intensive Care Unit

van Essen, Tanja (author), Gangaram-Panday, Norani H. (author), van Weteringen, Willem (author), Goos, T.G. (author), Reiss, Irwin K.M. (author), de Jonge, Rogier C.J. (author)

Introduction: Transcutaneous blood gas monitoring allows for continuous non-invasive evaluation of carbon dioxide and oxygen levels. Its use is limited as its accuracy is dependent on several factors. We aimed to identify the most influential factors to increase usability and aid in the interpretation of transcutaneous blood gas monitoring....

journal article 2023

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Heterogeneous fleet sizing for on-demand transport in mixed automated and non-automated urban areas

Fan, Q. (author), van Essen, J.T. (author), Correia, Gonçalo (author)

The era of intelligent transportation with automated vehicles (AVs) is coming. Nonetheless, the transition to this system will be a gradual process. On the one hand, some zones in the city may be dedicated to AVs with a fully intelligent traffic management system geared toward high performance. On the other hand, automated and conventional...

journal article 2022

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A mathematical programming model for optimal fleet management of electric car-sharing systems with Vehicle-to-Grid operations

Prencipe, Luigi Pio (author), van Essen, J.T. (author), Caggiani, Leonardo (author), Ottomanelli, Michele (author), Correia, Gonçalo (author)

Electric car-sharing systems have attracted large attention in recent years as a new business model for achieving both economic and environmental benefits in urban areas. Among different types, the one considered in this paper is the so-called one-way car-sharing system whereby a user can begin and end a trip at any station of the system. At...

journal article 2022

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Transcutaneous carbon dioxide monitoring during therapeutic hypothermia for neonatal encephalopathy

Gangaram-Panday, Norani H. (author), van Essen, Tanja (author), van Weteringen, Willem (author), Dremmen, Marjolein H.G. (author), Goos, T.G. (author), de Jonge, Rogier C.J. (author), Reiss, Irwin K.M. (author)

Background: In neonates with post-asphyxial neonatal encephalopathy, further neuronal damage is prevented with therapeutic hypothermia (TH). In addition, fluctuations in carbon dioxide levels have been associated with poor neurodevelopmental outcome, demanding close monitoring. This study investigated the accuracy and clinical value of...

journal article 2022

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MILP models for the Dial-a-Ride problem with transfers

Pierotti, J. (author), van Essen, J.T. (author)

Automated vehicles are becoming a reality. Expectations are that AVs will ultimately transform personal mobility from privately owned assets to on-demand services. This transformation will enhance the possibility of sharing trips, leading to shared AVs (SAVs). The preeminent aim of this paper is to lay foundations for fast and efficient...

journal article 2021

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Screening wave conditions for the occurrence of green water events on sailing ships

van Essen, S.M. (author), Monroy, Charles (author), Shen, Zhirong (author), Helder, Joop (author), Kim, Dae Hyun (author), Seng, Sopheak (author), Ge, Zhongfu (author)

Design loads for extreme wave events on ships, such as slamming and green water, are hard to define. These events depend on details in the incoming waves, ship motions and structure layout, which requires high-fidelity tools such as CFD or experiments to obtain the correct loads. These tools (presently) do not have the capability to fully...

journal article 2021

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Dynamic planning for simultaneous recharging and relocation of shared electric taxies: A sequential MILP approach

Jamshidi, Helia (author), Correia, Gonçalo (author), van Essen, J.T. (author), Nökel, Klaus (author)

Short driving range, limited chargers, and long charging times challenge the profitability of electric taxi operations. In this paper, a charging algorithm is developed to accompany a taxi service with online trip requests, which uses a private charging infrastructure for both slow and fast charging. The vehicle charging curves are assumed to be...

journal article 2021

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Scheduling surgery groups considering multiple downstream resources

Schneider, A.J. Thomas (author), van Essen, J.T. (author), Carlier, Mijke (author), Hans, Erwin W. (author)

Surgery groups are clustered surgery procedure types that share comparable characteristics (e.g. expected duration). Scheduling OR blocks leaves many options for operational surgery scheduling and this increases the variation in usage of both the OR and downstream beds. Therefore, we schedule surgery groups to reduce the options for...

journal article 2020

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Dynamic Light Scattering: A New Noninvasive Technology for Neonatal Heart Rate Monitoring

Gangaram-Panday, Norani H. (author), van Essen, Tanja (author), Goos, T.G. (author), De Jonge, Rogier C.J. (author), Reiss, Irwin K.M. (author), van Weteringen, Willem (author)

Heart rate (HR) detection in premature infants using electrocardiography (ECG) is challenging due to a low signal amplitude and the fragility of the premature skin. Recently, the dynamic light scattering (DLS) technique has been miniaturized, allowing noninvasive HR measurements with a single sensor. Objective: The aim was to determine the...

journal article 2020

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Novel transcutaneous sensor combining optical tcPO₂ and electrochemical tcPCO₂ monitoring with reflectance pulse oximetry

van Weteringen, Willem (author), Goos, T.G. (author), van Essen, Tanja (author), Ellenberger, Christoph (author), Hayoz, Josef (author), de Jonge, Rogier C.J. (author), Reiss, Irwin K.M. (author), Schumacher, Peter M. (author)

This study investigated the accuracy, drift, and clinical usefulness of a new optical transcutaneous oxygen tension (tcPO₂) measuring technique, combined with a conventional electrochemical transcutaneous carbon dioxide (tcPCO₂) measurement and reflectance pulse oximetry in the novel transcutaneous OxiVenT™ Sensor. In...

journal article 2020

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The influence of apparatus stiffness on the results of cyclic direct simple shear tests on dense sand

Konstadinou, M. (author), Bezuijen, A. (author), Greeuw, G. (author), Zwanenburg, C. (author), van Essen, H. M. (author), Voogt, L. (author)

A series of undrained cyclic direct simple shear (CDSS) tests on dense Toyoura sand has been performed with the aim to investigate the influence of the stiffness of the DSS device on test results. To this end, springs were installed to reduce deliberately the stiffness of the apparatus. It is shown that the cyclic resistance of the sand...

journal article 2020

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Scheduling Non-Urgent Patient Transportation While Maximizing Emergency Coverage

van den Berg, P.L. (author), van Essen, J.T. (author)

Many ambulance providers operate both advanced life support (ALS) and basic life support (BLS) ambulances. Typically, only an ALS ambulance can respond to an emergency call, whereas non-urgent patient transportation requests can be served by either an ALS or a BLS ambulance. The total capacity of BLS ambulances is usually not enough to...

journal article 2019

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Exact formulation and comparison between the user optimum and system optimum solution for routing privately owned automated vehicles

van Essen, J.T. (author), Correia, Gonçalo (author)

The possibility of having driverless cars on the streets seems to be more real than ever. In this paper, we focus on developing exact methods that can determine the effects of privately owned automated vehicles (AVs) and how switching to those vehicles is going to change mobility in urban environments. The considered problem determines the...

journal article 2019

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The effect of travel time information on day-to-day route choice behaviour: evidence from a real-world experiment

van Essen, Mariska (author), Thomas, Tom (author), Chorus, C.G. (author), van Berkum, Eric (author)

Route choice behaviour in response to travel information receives increasing attention within travel behaviour research. This study contributes to the literature by generating insights into the effect of travel information on day-to-day route choice behaviour based on largely explorative analyses using route choice data obtained from a real...

journal article 2019