Thomas Ulrich

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6ranked-venue papers

2as first author

2since 2021 · last 2023

0000-0002-4164-8933ORCID · corroborated

Domains — the database's venue-derived domains; a paper can count in several

Systems, architecture and hardware · 3 · 2 since 2021Applied, interdisciplinary, general and emerging computing · 2 · 2 first-authorComputer networks · 1

Expertise — from the expertise taxonomy: the topics of the expert's papers under the CCF categories. A weight counts papers with recency: 1 for a paper about the topic, 0.3 when the topic is its context, halved every five years.

Interdisciplinary, comprehensive, and emerging computing 2 papers		Environmental and earth informatics · 64% Computational science and engineering · 36%
Computer architecture, parallel and distributed computing, and storage systems 2 papers		High-performance computing · 100%
Computer networks 1 paper		Cellular and mobile networks · 70% Physical-layer communications · 30%

Topics — the 7 heaviest of 9, each with the papers that count most for it

Topic	Weight	Papers	Last	Evidence papers
Environmental and earth informatics geophysics	0.5	1	2021	3D acoustic-elastic coupling with gravity: the dynamics of the 2018 palu, sulawesi earthquake and tsunami · SC 2021
High-performance computing scientific computing systems	0.3	1	2017	Extreme scale multi-physics simulations of the tsunamigenic 2004 sumatra megathrust earthquake · SC 2017
High-performance computing › supercomputing petascale computing	0.1	1	2021	3D acoustic-elastic coupling with gravity: the dynamics of the 2018 palu, sulawesi earthquake and tsunami · SC 2021
High-performance computing unstructured mesh computation	0.1	1	2021	3D acoustic-elastic coupling with gravity: the dynamics of the 2018 palu, sulawesi earthquake and tsunami · SC 2021
Cellular and mobile networks 3g network	0.0	1	2000	The TD-CDMA based UTRA TDD mode · IEEE J. Sel. Areas Commun. 2000
Cellular and mobile networks radio access networks	0.0	1	2000	The TD-CDMA based UTRA TDD mode · IEEE J. Sel. Areas Commun. 2000
Physical-layer communications › code-division multiple access TD-CDMA	0.0	1	2000	The TD-CDMA based UTRA TDD mode · IEEE J. Sel. Areas Commun. 2000

Methods — techniques the papers use, named apart from their topics

discontinuous galerkin · 1.0ADER local time-stepping · 1.0unstructured mesh · 0.6parallel simulation · 0.6system architecture · 0.0

Year	Publication	Venue	Position
2023	The EU Center of Excellence for Exascale in Solid Earth (ChEESE): Implementation, results, and roadmap for the second phase abstract The EU Center of Excellence for Exascale in Solid Earth (ChEESE) develops exascale transition capabilities in the domain of Solid Earth, an area of geophysics rich in computational challenges embracing different approaches to exascale (capability, capacity, and urgent computing). The first implementation phase of the project (ChEESE-1P; 2018–2022) addressed scientific and technical computational challenges in seismology, tsunami science, volcanology, and magnetohydrodynamics, in order to understand the phenomena, anticipate the impact of natural disasters, and contribute to risk management. The project initiated the optimisation of 10 community flagship codes for the upcoming exascale systems and implemented 12 Pilot Demonstrators that combine the flagship codes with dedicated workflows in order to address the underlying capability and capacity computational challenges. Pilot Demonstrators reaching more mature Technology Readiness Levels (TRLs) were further enabled in operational service environments on critical aspects of geohazards such as long-term and short-term probabilistic hazard assessment, urgent computing, and early warning and probabilistic forecasting. Partnership and service co-design with members of the project Industry and User Board (IUB) leveraged the uptake of results across multiple research institutions, academia, industry, and public governance bodies (e.g. civil protection agencies). This article summarises the implementation strategy and the results from ChEESE-1P, outlining also the underpinning concepts and the roadmap for the on-going second project implementation phase (ChEESE-2P; 2023–2026). Arnau Folch, Claudia Abril, Michael Afanasiev, Giorgio Amati, Michael Bader, Rosa M. Badia, Hafize B. Bayraktar, Sara Barsotti, Roberto Basili 0002, Fabrizio Bernardi, Christian Boehm, Beatriz Brizuela, Federico Brogi, Eduardo Cabrera, Emanuele Casarotti, Manuel Jesús Castro Díaz, Matteo Cerminara, Antonella Cirella, Alexey Cheptsov, Javier Conejero, Antonio Costa 0002, Marc de la Asunción, Josep de la Puente, Marco Djuric, Ravil Dorozhinskii, Gabriela Espinosa, Tomaso Esposti Ongaro, Joan Farnós, Nathalie Favretto-Cristini, Andreas Fichtner, Alexandre Fournier, Alice-Agnes Gabriel, Jean-Matthieu Gallard, Steven J. Gibbons, Sylfest Glimsdal, José Manuel González-Vida, José Gracia, Rose Gregorio, Natalia Gutiérrez, Benedikt Halldorsson, Okba Hamitou, Guillaume Houzeaux, Stephan Jaure, Mouloud Kessar, Lukas Krenz, Lion Krischer, Soline Laforet, Piero Lanucara, Bo Li 0147, Maria Concetta Lorenzino, Stefano Lorito, Finn Løvholt, Giovanni Macedonio, Jorge Macías Sánchez, Guillermo Marin, Beatriz Martínez Montesinos, Leonardo Mingari, Geneviève Moguilny, Vadim Montellier, Marisol Monterrubio Velasco, Georges-Emmanuel Moulard, Masaru Nagaso, Massimo Nazaria, Christoph Niethammer, Federica Pardini, Marta Pienkowska, Luca Pizzimenti, Natalia Poiata, Leonhard Rannabauer, Otilio Rojas, Juan Esteban Rodriguez, Fabrizio Romano, Oleksandr Rudyy, Vittorio Ruggiero, Philipp Samfass, Carlos Sánchez-Linares, Sabrina Sanchez, Laura Sandri, Antonio Scala, Nathanaël Schaeffer, Joseph Schuchart, Jacopo Selva, Amadine Sergeant, Angela Stallone, Matteo Taroni, Solvi Thrastarson, Manuel Titos, Nadia Tonelllo, Roberto Tonini, Thomas Ulrich, Jean-Pierre Vilotte, Malte Vöge, Manuela Volpe, Sara Aniko Wirp, Uwe Wössner	Future Gener. Comput. Syst.	90
2021	3D acoustic-elastic coupling with gravity: the dynamics of the 2018 palu, sulawesi earthquake and tsunami abstract We present a highly scalable 3D fully-coupled Earth & ocean model of earthquake rupture and tsunami generation and perform the first fully coupled simulation of an actual earthquake-tsunami event and a 3D benchmark problem of tsunami generation by a megathrust dynamic earthquake rupture. Multi-petascale simulations, with excellent performance demonstrated on three different platforms, allow high-resolution forward modeling. Our largest mesh has ≈261 billion degrees of freedom, resolving at least 15 Hz of the acoustic wave field. We self-consistently model seismic, acoustic and surface gravity wave propagation in elastic (Earth) and acoustic (ocean) materials sourced by physics-based non-linear earthquake dynamic rupture, thereby gaining insight into the tsunami generation process without relying on approximations that have previously been applied to permit solution of this challenging problem. Complicated geometries, including high-resolution bathymetry, coastlines and segmented earthquake faults are discretized by adaptive unstructured tetrahedral meshes. This inevitably leads to large differences in element sizes and wave speeds which can be mitigated by ADER local time-stepping and a Discontinuous Galerkin discretization yielding high-order accuracy in time and space. Lukas Krenz, Carsten Uphoff, Thomas Ulrich, Alice-Agnes Gabriel, Lauren S. Abrahams, Eric M. Dunham, Michael Bader	SC	3
2017	Extreme scale multi-physics simulations of the tsunamigenic 2004 sumatra megathrust earthquake abstract We present a high-resolution simulation of the 2004 Sumatra-Andaman earthquake, including non-linear frictional failure on a megathrustsplay fault system. Our method exploits unstructured meshes capturing the complicated geometries in subduction zones that are crucial to understand large earthquakes and tsunami generation. These up-to-date largest and longest dynamic rupture simulations enable analysis of dynamic source effects on the seafloor displacements. Carsten Uphoff, Sebastian Rettenberger, Michael Bader, Elizabeth H. Madden, Thomas Ulrich, Stephanie Wollherr, Alice-Agnes Gabriel	SC	5
2014	Uncertainty estimation for kinematic laser tracker measurements incorporating the control information of an industrial robot abstract Laser trackers are widely used in the field of industrial metrology to measure kinematic tasks such as tracking robot movements. In order to assess spatiotemporal deviations of a robots movement it is crucial to have a reliable uncertainty of the kinematic measurements. Common methods to evaluate the uncertainty in kinematic measurements include approximations specified by the manufactures, various analytical adjustment methods and Kalman filters. In this paper a new, real-time approach is proposed, which estimates the 4D-path (3D-position + time) uncertainty of an arbitrary path in space by incorporating the control information of an industrial robot. The proposed approach relies on Bayesian filtering and avoids the need for predefined motion models due to the incorporation of the robots control information into the analysis method. Furthermore, a common laser tracker model is augmented with kinematic properties in order to be utilized as a self-regulating measurement model, within the Bayesian filter. The new approach is demonstrated by using data obtained by tracking the tool centre point of a KR 5 ARC industrial robot with a synchronized Leica laser tracker AT901. It shows that the proposed approach is more appropriate to analysing kinematic processes, as it avoids all problems arising from predefined motion models in Bayesian filters for tracking. In comparison with the manufacturers approximations, the new approach takes account of kinematic behaviour, with an improved description of the real measurement process and a reduction in estimated variance. This approach is therefore well-suited to the analysis of robot movements. Thomas Ulrich, Stephan Irgenfried	IPIN	1
2012	Uncertainty estimation for kinematic laser tracker measurements abstract Laser trackers are widely used to measure kinematic tasks such as tracking robot movements. Common methods to evaluate the uncertainty in the kinematic measurement include approximations specified by the manufacturers, various analytical adjustment methods and the Kalman filter. In this paper a new, real-time technique is proposed, which estimates the 4D-path (3D-position + time) uncertainty of an arbitrary path in space. Here a hybrid system estimator in conjunction with kinematic measurement model is applied. This method can be applied to processes, which include various types of kinematic behaviour, constant velocity, variable acceleration or variable turn rates. The new approach is compared with the Kalman filter and a manufacturer's approximations. The comparison was made using data obtained by tracking an industrial robot's tool centre point (TCP) with a Leica laser tracker AT901. It shows that the new approach is more appropriate to analysing kinematic processes than the Kalman filter, as it reduces overshoots and decreases the estimated variance. In comparison with the manufacturer's approximations, the new approach takes account of kinematic behaviour, with an improved description of the real measurement process and a reduction in estimated variance. This approach is therefore well-suited to the analysis of kinematic processes with unknown changes in kinematic behaviour. Thomas Ulrich	IPIN	1
2000	The TD-CDMA based UTRA TDD mode abstract The third-generation mobile radio system UTRA that has been specified in the Third Generation Partnership Project (3GPP) consists of an FDD and a TDD mode. This paper presents the UTRA TDD mode, which is based on TD-CDMA. Important system features are explained in detail. Moreover, an overview of the system architecture and the radio interface protocols is given. Furthermore, the physical layer of UTRA TDD is explained, and the protocol operation is described. Martin Haardt, Anja Klein 0002, Reinhard Köhn, Stefan Oestreich, Marcus Purat, Volker Sommer, Thomas Ulrich	IEEE J. Sel. Areas Commun.	7