Welcome

This is the personal website of Leon Helwerda. Details regarding the scientific work and education of Leon are made available here.

Research projects

Grip on Software (GROS): Large-scale data-driven analysis of Scrum software development practices [1] [4]
Flavivirus RNA structure (RNA): Strutured pattern search in RNA sequences [2]
MycoDiversity Database (MDDB): Database for accessing and making sense of fungal biodiversity data [3]
Mobile radio tomography (MRT): Using moving agents that perform wireless signal strength measurements in order to obtain a reconstruction of objects inside an area of interest [5] [6] [7] [8]

Focus areas

Machine learning: Neural networks, deep learning, classification and regression algorithms
Vehicle routing problems
Genetic algorithms, multiobjective evolutionary algorithms
Algorithms and complexity
Tomography and singal noise reduction
Sentiment analysis
Software analytics
System administration

Education

2017-2024: PhD student at LIACS [1]
2014-2016: Master student Computer Science at LIACS [7] [8]
2011-2014: Bachelor student Informatics at LIACS [9]
2010-2011: Bachelor student Mathematics (for a year) at the Mathematisch Instituut
2004-2010: VWO/Gymnasium

Teaching and assisting

Early spring 2020: Assistant at the Bio-Modeling course, LIACS
Fall 2019: Practicum leader at the Programming Methods NA course, LIACS
Spring 2019: Assistant at the Bio-Modelling and Petri Nets course, LIACS
Fall 2018: Practicum leader at the Programming Methods NA course, LIACS
Spring 2018: Assistant at Bio-Modelling and Petri Nets course, LIACS
Fall 2017: Teaching assistant at the Programming Methods NA course, LIACS
Spring 2017: Teaching assistant at the Programming Techniques course, LIACS
2014-2016: Teaching assistant at the Algorithmics course, LIACS
2013-2016: Teaching assistant at the Programming Methods course, LIACS

Publications

2024: L. Helwerda. Grip on Software: Understanding development progress of Scrum sprints and backlogs. PhD thesis. LIACS, Leiden University. SIKS Dissertation Series 2024-28
2020: A. Zammit, L. Helwerda, R.C.L. Olsthoorn, F.J. Verbeek, A.P. Gultyaev. A database of flavivirus RNA structures with a search algorithm for pseudoknots and triple base interactions. Bioinformatics, vol. 37 issue 7, pp. 956–962; 10.1093/bioinformatics/btaa759; BibTeX
2020: I. Martorelli, L. Helwerda, J. Kerkvliet, S.I.F. Gomes, J. Nuytinck, C.R.A. van der Werff, G.J. Ramackers, A.P. Gultyaev, V.S.F.T. Merckx, F.J. Verbeek. Fungal metabarcoding data integration framework for the MycoDiversity DataBase (MDDB). Journal of Integrative Bioinformatics, vol. 17 issue 1, article 20190046; 10.1515/jib-2019-0046; BibTeX
2017: L. Helwerda, F. Niessink, F.J. Verbeek. Conceptual Process Models and Quantitative Analysis of Classification Problems in Scrum Software Development Practices. In: A. Fred, J. Felipe (eds) Proceedings of the 9th International Joint Conference on Knowledge Discovery, Knowledge Engineering and Knowledge Management (IC3K 2017 - KDIR), Madeira, pp. 357–366; 10.5220/0006602803570366; BibTeX
2017: K.J. Batenburg, L. Helwerda, W.A. Kosters, T. van der Meij. Mobile Radio Tomography: Agent-Based Imaging. In: T. Bosse, B. Bredeweg (eds) BNAIC 2016: Artificial Intelligence. Communications in Computer and Information Science, vol. 765, pp. 63–77. Springer (extended version of [6]); 10.1007/978-3-319-67468-1_5; BibTeX
2016: K.J. Batenburg, L. Helwerda, W.A. Kosters, T. van der Meij. Agents for mobile radio tomography. In: Proceedings of the 28th Benelux Conference on Artificial Intelligence (BNAIC), Amsterdam, pp. 17–24; BibTeX
2016: L. Helwerda. Mobile radio tomography: Autonomous vehicle planning for dynamic sensor positions. Masters thesis. LIACS, Leiden University
2016: L. Helwerda. Mobile radio tomography: Object detection using autonomous unmanned vehicles. Masters research project report. LIACS, Leiden University
2014: L. Helwerda. Theory and Applications of Deep Learning Networks. Bachelor’s thesis. LIACS, Leiden University

These publications are also available for bundled download in BibTeX format.

Contact

Gorlaeus Building
Postal address: Einsteinweg 55, 2333 CC Leiden, The Netherlands
Mail: l.s.helwerda in the domain of liacs.leidenuniv.nl
GitHub: lhelwerd
PyPI: lhelwerd
npm: lhelwerda
Coveralls: lhelwerd
ResearchGate: Leon Helwerda
Google Scholar: Leon Helwerda
ORCID: 0000-0002-4299-466X
DBLP: Leon S. Helwerda
VIAF: 67152023731103312036
ISNI: 0000 0005 0269 0073

Leon Helwerda