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Ulrike Thomas

19 accepted papers

2026

Causal Transformer-Based Online Action Recognition for High-Level Control of a Unitree Go1 Robot

ICRA 2026poster

We present a new causal transformer system consisting of Spatial-Attention Tokenization (SAT) with MultiResolution Causal Temporal Mixing (MRCTM) to perform online skeleton-based action recognition during human–robot interaction. The novel architecture uses Spatial-Attention Tokenization (SAT) to ge…

Cited by 0Scholar
2023

Parameter Optimization for Manipulator Motion Planning using a Novel Benchmark Set

ICRA 2023poster

Sampling-based motion planning algorithms have been continuously developed for more than two decades. Apart from mobile robots, they are also widely used in manipulator motion planning. Hence, these methods play a key role in collaborative and shared workspaces. Despite numerous improvements, their…

Cited by 2SourceScholar
2022

Evaluation of On-Robot Capacitive Proximity Sensors with Collision Experiments for Human-Robot Collaboration

IROS 2022poster

A robot must comply with very restrictive safety standards in close human-robot collaboration applications. These standards limit the robot's performance because of speed reductions to avoid potentially large forces exerted on humans during collisions. On-robot capacitive proximity sensors (CPS) can…

Cited by 5SourceScholar
2021

A Unified Perception Benchmark for Capacitive Proximity Sensing Towards Safe Human-Robot Collaboration (HRC)

ICRA 2021poster

During the co-presence of human workers and robots, measures are required to avoid injuries from undesired contacts. Capacitive Proximity Sensors (CPSs) offer a cost-effective solution to cover the entire robot manipulator with fast close-range perception for HRC tasks, closing the perception gap be…

Cited by 13SourceScholar
2021

Improving Safety and Accuracy of Impedance Controlled Robot Manipulators with Proximity Perception and Proactive Impact Reactions

ICRA 2021poster

We present a system which improves the safety and accuracy of impedance controlled robotic manipulators with proximity perception. Proximity servoed manipulators, which use proximity sensors attached to the robot’s outer shell, have recently demonstrated robust collision avoidance abilities. Neverth…

Cited by 17SourceScholar
2020

Using Machine Learning for Material Detection with Capacitive Proximity Sensors

IROS 2020poster

The ability of detecting materials plays an important role in robotic applications. The robot can incorporate the information from contactless material detection and adapt its behavior in how it grasps an object or how it walks on specific surfaces. In this, paper we apply machine learning on impeda…

Cited by 15SourceScholar
2019

With Proximity Servoing towards Safe Human-Robot-Interaction

IROS 2019poster

In this paper, we present a serial kinematic robot manipulator equipped with multimodal proximity sensing modules not only on the TCP but distributed on the robot's surface. The combination of close distance proximity information from capacitive and time-of-flight (ToF) measurements allows the robot…

Cited by 33SourceScholar
2018

A General and Flexible Search Framework for Disassembly Planning

ICRA 2018poster

We present a new general framework for disassembly sequence planning. This framework is versatile allowing different types of search schemes (exhaustive vs. preemptive), various part separation techniques, and the ability to group parts, or not, into subassemblies to improve the solution efficiency…

Cited by 17SourceScholar
2017

A method for hand-eye and camera-to-camera calibration for limited fields of view

IROS 2017poster

In classical robot-camera calibration, a 6D transformation between the camera frame and the local frame of a robot is estimated by first observing a known calibration object from a number of different view points and then finding transformation parameters that minimize the reprojection error. The di…

Cited by 3SourceScholar
2017

Error robust and efficient assembly sequence planning with haptic rendering models for rigid and non-rigid assemblies

ICRA 2017poster

This paper presents a new approach for error robust assembly sequence planning which uses haptic rendering models (HRMs) for the representation of assemblies. Our assembly planning system uses HRMs for collision test along mating vectors, which are generated by stereographic projection. The planner…

Cited by 14SourceScholar