This map shows the geographic impact of Ulf Witkowski's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Ulf Witkowski with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Ulf Witkowski more than expected).
This network shows the impact of papers produced by Ulf Witkowski. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Ulf Witkowski. The network helps show where Ulf Witkowski may publish in the future.
Co-authorship network of co-authors of Ulf Witkowski
This figure shows the co-authorship network connecting the top 25 collaborators of Ulf Witkowski.
A scholar is included among the top collaborators of Ulf Witkowski based on the total number of
citations received by their joint publications. Widths of edges
represent the number of papers authors have co-authored together.
Node borders
signify the number of papers an author published with Ulf Witkowski. Ulf Witkowski is excluded from
the visualization to improve readability, since they are connected to all nodes in the network.
Kim, Jong-Hwan, Shuzhi Sam Ge, Prahlad Vadakkepat, et al.. (2009). Progress in Robotics: FIRA RoboWorld Congress 2009, Incheon, Korea, August 16-20, 2009. Proceedings. Springer eBooks.2 indexed citations
Amin, Safaa, et al.. (2007). Environment Exploration Using Mini-Robot Khepera. PUB – Publications at Bielefeld University (Bielefeld University).4 indexed citations
9.
Witkowski, Ulf, et al.. (2007). A Bluetooth Scatternet for the Khepera Robot. Publikationen an der Universität Bielefeld (Universität Bielefeld). 6(36). 50–2.2 indexed citations
10.
Witkowski, Ulf, et al.. (2006). MPEG-4-Based Interactive Visualization as an Analysis Tool for Experiments in Robotics.. 186–192.8 indexed citations
Witkowski, Ulf, et al.. (2004). Fuzzy Logic Based Intelligent Motion Control of Robots Swarm Simulated by Khepera Robots. PUB – Publications at Bielefeld University (Bielefeld University).1 indexed citations
Porrmann, Mario, et al.. (2002). A Reconfigurable SOM Hardware Accelerator. PUB – Publications at Bielefeld University (Bielefeld University). 337–342.15 indexed citations
16.
Witkowski, Ulf, Arne Heittmann, & Ulrich Rückert. (2001). Hardware Implementation of Self-Organizing Maps and Associative Memory on the Minirobot Khepera. PUB – Publications at Bielefeld University (Bielefeld University).3 indexed citations
17.
Witkowski, Ulf, et al.. (2001). Extension Module for Application-Specific Hardware on the Minirobot Khepera. PUB – Publications at Bielefeld University (Bielefeld University).4 indexed citations
18.
Witkowski, Ulf, et al.. (1999). Digital Hardware Realization of a Hyper Basis Function Network for On. 205.1 indexed citations
Schutte, Flip, S. Beineke, H. Grotstollen, et al.. (1997). Structure-and Parameter Identification for a Two-Mass-System With Backlash and Friction Using a Self-Organizing Map. PUB – Publications at Bielefeld University (Bielefeld University). 3.12 indexed citations
Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive
bibliographic database. While OpenAlex provides broad and valuable coverage of the global
research landscape, it—like all bibliographic datasets—has inherent limitations. These include
incomplete records, variations in author disambiguation, differences in journal indexing, and
delays in data updates. As a result, some metrics and network relationships displayed in
Rankless may not fully capture the entirety of a scholar's output or impact.