339 citations · 1.3k across the 23 of their papers we have counts for
24 papers
Towards Safer Autonomous Driving in an Open World: A Dual-Process Approach
Simon Janssen, Michiel Braat, Chris van der Ploeg +2
Before autonomous driving systems can be deployed on public roads, it is vital that these systems comply with safety standards, traffic rules, and social norms. Although neural net…
What Did I Learn? Operational Competence Assessment for AI-Based Trajectory Planners
Michiel Braat, Maren Buermann, Marijke van Weperen +1
Automated driving functions increasingly rely on machine learning for tasks like perception and trajectory planning, requiring large, relevant datasets. The performance of these al…
Connecting the Dots: Context-Driven Motion Planning Using Symbolic Reasoning
Chris van der Ploeg, Michiel Braat, Beatrice Masini +2
The introduction of highly automated vehicles on the public road may improve safety and comfort, although its success will depend on social acceptance. This requires trajectory pla…
PRISMA: A Novel Approach for Deriving Probabilistic Surrogate Safety Measures for Risk Evaluation
Erwin de Gelder, Kingsley Adjenughwure, Jeroen Manders +5
Surrogate Safety Measures (SSMs) are used to express road safety in terms of the safety risk in traffic conflicts. Typically, SSMs rely on assumptions regarding the future evolutio…
Scenario Parameter Generation Method and Scenario Representativeness Metric for Scenario-Based Assessment of Automated Vehicles
Erwin de Gelder, Jasper Hof, Eric Cator +4
The development of assessment methods for the performance of Automated Vehicles (AVs) is essential to enable the deployment of automated driving technologies, due to the complex op…
Constrained Sampling from a Kernel Density Estimator to Generate Scenarios for the Assessment of Automated Vehicles
Erwin de Gelder, Eric Cator, Jan-Pieter Paardekooper +2
The safety assessment of automated vehicles (AVs) is an important aspect of the development cycle of AVs. A scenario-based assessment approach is accepted by many players in the fi…
Real-World Scenario Mining for the Assessment of Automated Vehicles
Erwin de Gelder, Jeroen Manders, Corrado Grappiolo +3
Scenario-based methods for the assessment of Automated Vehicles (AVs) are widely supported by many players in the automotive field. Scenarios captured from real-world data can be u…
Towards an Ontology for Scenario Definition for the Assessment of Automated Vehicles: An Object-Oriented Framework
E. de Gelder, J. -P. Paardekooper, A. Khabbaz Saberi +5
The development of new assessment methods for the performance of automated vehicles is essential to enable the deployment of automated driving technologies, due to the complex oper…
Conditions for Reionizing the Universe with A Low Galaxy Ionizing Photon Escape Fraction
Steven L. Finkelstein, Anson D'Aloisio, Jan-Pieter Paardekooper +7
We explore scenarios for reionizing the intergalactic medium with low galaxy ionizing photon escape fractions. We combine simulation-based halo-mass dependent escape fractions with…
A case study of hurdle and generalized additive models in astronomy: the escape of ionizing radiation
M. W. Hattab, R. S. de Souza, B. Ciardi +3
The dark ages of the Universe end with the formation of the first generation of stars residing in primeval galaxies. These objects were the first to produce ultraviolet ionizing ph…
SPRAI: Coupling of radiative feedback and primordial chemistry in moving mesh hydrodynamics
Ondrej Jaura, Simon C. O. Glover, Ralf S. Klessen +1
In this paper we introduce a new radiative transfer code SPRAI (Simplex Photon Radiation in the Arepo Implementation) based on the SimpleX radiation transfer method. This method, o…
Galactic wind X-ray heating of the intergalactic medium during the Epoch of Reionization
Avery Meiksin, Sadegh Khochfar, Jan-Pieter Paardekooper +2
The diffuse soft X-ray emissivity from galactic winds is computed during the Epoch of Reionization (EoR). We consider two analytic models, a pressure-driven wind and a superbubble…
The spectral evolution of the first Galaxies. III. Simulated James Webb Space Telescope spectra of reionization-epoch galaxies with Lyman continuum leakage
E. Zackrisson, C. Binggeli, K. Finlator +8
Using four different suites of cosmological simulations, we generate synthetic spectra for galaxies with different Lyman continuum escape fractions (fesc) at redshifts z=7-9, in th…
3D hydrodynamical and radiative transfer modeling of Eta Carinae's colliding winds
Thomas I. Madura, Nicola Clementel, Theodore R. Gull +3
We present results of full 3D hydrodynamical and radiative transfer simulations of the colliding stellar winds in the massive binary system Eta Carinae. We accomplish this by apply…
3D radiative transfer simulations of Eta Carinae's inner colliding winds - II: Ionization structure of helium at periastron
Nicola Clementel, Thomas I. Madura, Chael J. H. Kruip +1
Spectral observations of the massive colliding wind binary Eta Carinae show phase-dependent variations, in intensity and velocity, of numerous helium emission and absorption lines…
3D Printing Meets Computational Astrophysics: Deciphering the Structure of Eta Carinae's Inner Colliding Winds
Thomas I. Madura, Nicola Clementel, Theodore R. Gull +2
We present the first 3D prints of output from a supercomputer simulation of a complex astrophysical system, the colliding stellar winds in the massive (>120 M_Sun), highly eccentri…
The First Billion Years Project: The escape fraction of ionizing photons in the epoch of reionization
Jan-Pieter Paardekooper, Sadegh Khochfar, Claudio Dalla Vecchia
Proto-galaxies forming in low-mass dark matter haloes are thought to provide the majority of ionizing photons needed to reionize the Universe, due to their high escape fractions of…
3D radiative transfer simulations of Eta Carinae's inner colliding winds - I. Ionization structure of helium at apastron
Nicola Clementel, Thomas I. Madura, Chael Kruip +2
The highly eccentric binary system Eta Carinae shows numerous time-variable emission and absorption features. These observational signatures are the result of interactions between…
The impact of reionization on the formation of supermassive black hole seeds
Jarrett L. Johnson, Daniel J. Whalen, Bhaskar Agarwal +2
Direct collapse black holes (DCBHs) formed from the collapse of atomically-cooled primordial gas in the early Universe are strong candidates for the seeds of supermassive BHs. DCBH…
The First Billion Years project: birthplaces of direct collapse black holes
Bhaskar Agarwal, Claudio Dalla Vecchia, Jarrett L. Johnson +2
We investigate the environment in which direct-collapse black holes may form by analysing a cosmological, hydrodynamical simulation that is part of the First Billion Years project.…
The First Billion Years project - IV: Proto-galaxies reionising the Universe
Jan-Pieter Paardekooper, Sadegh Khochfar, Claudio Dalla Vecchia
The contribution of stars in galaxies to cosmic reionisation depends on the star formation history in the Universe, the abundance of galaxies during reionisation, the escape fracti…
The escape of ionising radiation from high-redshift dwarf galaxies
Jan-Pieter Paardekooper, Federico I. Pelupessy, Gabriel Altay +1
The UV escape fraction from high-redshift galaxies plays a key role in models of cosmic reionisation. Because it is currently not possible to deduce the escape fractions during the…
Mathematical properties of the SimpleX algorithm
C. J. H. Kruip, J. -P. Paardekooper, B. J. F. Clauwens +1
Context. Analytical and numerical analysis of the SimpleX radiative transfer algorithm, which features transport on a Delaunay triangulation. Aims. Verify whether the SimpleX radia…
SimpleX2: radiative transfer on an unstructured, dynamic grid
J. -P. Paardekooper, C. J. H. Kruip, V. Icke
We present an improved version of the SimpleX method for radiative transfer on an unstructured Delaunay grid. The grid samples the medium through which photons are transported in a…