Johannes Hirth

Raum 0445C
Universität Kassel
Fachbereich Elektrotechnik/Informatik
Fachgebiet Wissensverarbeitung
Wilhelmshöher Allee 73
34121 Kassel
Tel.: +49 561 804-6350
Fax.: +49 561 804-6259


  • 1.
    Hanika, T., Hirth, J.: Exploring Scale-Measures of Data Sets,, (2021).
  • 1.
    Hanika, T., Hirth, J.: Quantifying the Conceptual Error in Dimensionality Reduction. Accepted for publication at ICCS 2021. (2021).
  • 1.
    Hanika, T., Hirth, J.: Knowledge Cores in Large Formal Contexts,, (2020).
  • 1.
    Hanika, T., Hirth, J.: On the Lattice of Conceptual Measurements. (2020).
  • 1.
    Hanika, T., Hirth, J.: Conexp-Clj - A Research Tool for FCA. In: Cristea, D., Ber, F.L., Missaoui, R., Kwuida, L., and Sertkaya, B. (eds.) ICFCA (Supplements). pp. 70–75. (2019).


  • September 2021: ‚Quantifying the Conceptual Error in Dimensionality Reduction‘, Applications of Formal Sciences: Explainable AI, Dagstuhl
  • March 2021: ‚Discovery of Conceptual Measurements/Entdecken Begrifflicher Messungen‘, Application of Formal Sciences — Explainable Artificial Intelligence, Dagstuhl
  • September 2020: ‚Navigating Conceptual Measurements‘, Dagstuhl Meeting on the Application of Formal Sciences — Knowledge Engineering


  • Subreviewer: FCA4AI-2021, 21 August 2021,  Montréal, Canada
  • Subreviewer: ECML PKDD,  13–17 September 2021
  • Subreviewer: 17th Russian Conference on Artificial Intelligence, 21–25 October, 2019, Ulyanovsk, Russia​
  • Subreviewer: 11th ACM conference ​on Web Science, June 30–July 3, 2019, Boston, MA, USA​


Winter Term 2021:

Winter Term 2020:

Summer Term 2020:


Accompanying my theoretical research, there are two projects I mainly work for:

Conexp-Clj — Scale-Exploration Standalone

Accompanying our research on conceptual measurements, we implemented the exploration of scale-measures algorithm in conexp-cjl and provided a standalone (Ready for Use) version of the algorithm. Associated Papers:

Conexp-Clj — A Research Tool for FCA

The research unit Knowledge & Data Engineering continues the development of the research tool conexp-clj, originally created by Dr. Daniel Borchmann. The continuous enhancement of the software package is supervised by Dr. Tom Hanika. Having such a tool at hand, the research group is able to test and analyze the theoretical research efforts in the realm of formal concept analysis and related fields. The most recent, pre-compiled, release candidate can be downloaded here.
A presentation of the tool can be found in Conexp-Clj – A Research Tool for FCA


BibSonomy is a scholarly social bookmarking system where researchers manage their collections of publications and web pages. BibSonomy is an open source project, continously developed by researchers in Kassel, Würzburg, and Hanover. Functioning as a test bed for recommendation and ranking algorithms, as well as through the publicly available datasets, containing traces of user behavior on the Web, BibSonomy has been the subject of various scientific studies.
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