Bahar İlgen, Ph.D.
About
I am a researcher working at the intersection of artificial intelligence, scientific reasoning, and biomedical natural language processing. My research explores how AI can support scientific understanding by extracting, structuring, and interpreting evidence, representing uncertainty, and making computational reasoning more transparent.
I focus on explainable, uncertainty-aware, and human-centered AI approaches that enable researchers to critically examine machine-generated outputs rather than simply rely on predictions. My work spans public health, biomedicine, and genomics, with a particular interest in evidence-based reasoning and knowledge discovery.
I am currently a postdoctoral researcher in the Phylogenomics Group at the Robert Koch Institute’s Centre for Artificial Intelligence in Public Health Research (ZKI-PH). Previously, I worked in the Visualization Group at ZKI-PH, where I also served as Deputy Research Group Leader.
Before joining the Robert Koch Institute, I was a postdoctoral researcher in the Language Technology Group at the University of Hamburg and an assistant professor at Istanbul Kültür University. I received my PhD in Computer Engineering from Istanbul Technical University.
Selected Publications
- İlgen, B., Shahid, A., & Kühnert, D. (2026). Interpretable Flavivirus Classification under Low-Coverage Conditions via ERF-Aware k-mer Attribution. EXPLIMED 2026 (IJCAI-ECAI Workshop).
- İlgen, B., Awotoro, E., & Hattab, G. (2026). VaxScope: Document-Level Structured Evidence Extraction from Immunization Systematic Reviews. BioNLP 2026 (ACL).
- Dubey, A., Anžel, A., İlgen, B., & Hattab, G. (2026). UbiQTree: Uncertainty Quantification in XAI with Tree Ensembles. Patterns.
- İlgen, B., & Hattab, G. (2026). Visualizing the Chain of Thought in Large Language Models. IEEE Computer Graphics and Applications.
- Köckritz, J., İlgen, B., Cohrdes, C., & Hattab, G. (2025). Current Applications and Future Directions in Natural Language Processing for News Media and Mental Health. Scientific Reports.
Research
My research develops AI methods that help researchers extract and structure scientific evidence, quantify uncertainty, and critically examine computational results and their underlying explanations. Rather than treating model outputs as final answers, I investigate how evidence-grounded, explainable, and human-centered approaches can support scientific understanding. This work brings together three complementary research directions.
Scientific Evidence and AI-Assisted Reasoning
I develop computational methods for extracting, structuring, and interpreting scientific evidence, with a focus on biomedical literature and systematic reviews. My work explores how natural language processing, structured evidence representations, and interactive tools can support evidence synthesis, scientific reasoning, and the critical examination of research findings.
Explainability, Uncertainty, and Human-Centered AI
I investigate how AI systems can make their outputs more interpretable and their limitations more transparent. My research combines explainable AI, uncertainty quantification, and human-centered approaches to examine how explanations and uncertainty estimates can help researchers critically evaluate model outputs and AI-assisted reasoning.
Reliable AI for Biomedical and Genomic Applications
I study the reliability and robustness of machine learning methods applied to biomedical and genomic data. My work examines model behavior and generalization under limited or incomplete data, with particular attention to identifying genomic features and patterns that contribute to model predictions.
Research Interests
- Natural Language Processing
- Explainable and Interpretable Artificial Intelligence
- Uncertainty Quantification and Reliable AI
- Scientific Evidence Extraction and Computational Argumentation
- Human-Centered AI and Visualization
- Biomedical NLP and Computational Genomics
Publications
20267
- Dubey, A., Anžel, A., İlgen, B., & Hattab, G. (2026). UbiQVision: Spatial Dempster-Shafer Fusion of XAI Attributions for Reliable Deep Vision Ensembles. Machine Learning with Applications, 101000.
- İlgen, B., Shahid, A., & Kühnert, D. (2026). Interpretable Flavivirus Classification under Low-Coverage Conditions via ERF-Aware k-mer Attribution. IJCAI-ECAI 2026 Workshop on Explainable Artificial Intelligence for the Medical Domain (EXPLIMED 2026). Accepted and presented; proceedings forthcoming.
- İlgen, B., Tolias, Y., Kühnert, D., Papadopoulou, P., Westerlund, M., Heider, D., Ladewig, K., & Hattab, G. (2026). Responsible Integration of AI in Cancer Genomics: Barriers, Risks, and Pathways to Trustworthy Clinical Translation. arXiv preprint, arXiv:2608.30912.
- İlgen, B., Awotoro, E., & Hattab, G. (2026). VaxScope: Document-Level Structured Evidence Extraction from Immunization Systematic Reviews. Proceedings of the 25th Workshop on Biomedical Language Processing (BioNLP 2026), 853–863. Association for Computational Linguistics.
- İlgen, B., & Hattab, G. (2026). Visualizing the Chain of Thought in Large Language Models. IEEE Computer Graphics and Applications, 46(1), 89–98.
- Dubey, A., Anžel, A., İlgen, B., & Hattab, G. (2026). UbiQTree: Uncertainty Quantification in XAI with Tree Ensembles. Patterns, 7(4), 101454.
- Hassan, H. A., Anžel, A., İlgen, B., et al. (2026). A Safety-Centric Perspective on Innovation and Risk in the Use of Artificial Intelligence in Genomics. Trends in Genetics.
20254
- Köckritz, J., İlgen, B., Cohrdes, C., & Hattab, G. (2025). Current Applications and Future Directions in Natural Language Processing for News Media and Mental Health. Scientific Reports, 15, 32532.
- İlgen, B., Dubey, A., & Hattab, G. (2025). PHAX: A Structured Argumentation Framework for User-Centered Explainable AI in Public Health and Biomedical Sciences. Proceedings of the 3rd International Workshop on Argumentation for Explainable AI (ArgXAI 2025), CEUR Workshop Proceedings, Vol. 4066.
- İlgen, B., & Hattab, G. (2025). Toward Human-Centered Readability Evaluation. Proceedings of the Fourth Workshop on Bridging Human-Computer Interaction and Natural Language Processing (HCI+NLP 2025), 263–273.
- Köckritz, J., İlgen, B., & Hattab, G. (2025). Reasoning Under Distress: Mining Claims and Evidence in Mental Health Narratives. Proceedings of the 12th Workshop on Argument Mining, 189–194.
20244
- İlgen, B., & Hattab, G. (2024). Visualizing Evidence through Natural Language Interaction for Public Health Interventions. Proceedings of the 8th International Conference on Natural Language Processing and Information Retrieval (NLPIR 2024), 431–438. ACM.
- Hattab, G., Anžel, A., Dubey, A., Ezekannagha, C., Yang, Z., & İlgen, B. (2024). Persona Adaptable Strategies Make Large Language Models Tractable. Proceedings of the 8th International Conference on Natural Language Processing and Information Retrieval (NLPIR 2024), 24–31. ACM.
- İlgen, B., & Hattab, G. (2024). A Lexical Simplification Framework for Turkish. Proceedings of the 8th International Conference on Natural Language Processing and Information Retrieval (NLPIR 2024). ACM.
- Yang, Z., Dai, X., Yang, W., İlgen, B., Anžel, A., & Hattab, G. (2024). Kernel-Based Learning for Safe Control of Discrete-Time Unknown Systems under Incomplete Observations. Proceedings of the 43rd Chinese Control Conference (CCC 2024), 6627–6632. IEEE.
20231
- İlgen, B., Pilic, A., Harder, T., & Hattab, G. (2023). Pre-Training to Identify Immunization-Related Entities from Systematic Reviews. Proceedings of the 7th International Conference on Natural Language Processing and Information Retrieval (NLPIR 2023), 234–239. ACM.
20221
- İlgen, B., & Biemann, C. (2022). CWITR: A Corpus for Automatic Complex Word Identification in Turkish Texts. Proceedings of the 6th International Conference on Natural Language Processing and Information Retrieval (NLPIR 2022), 157–163. ACM.
2007–202011
- Yılmaz, T., Ergil, A., & İlgen, B. (2020). Deep Learning-Based Document Modeling for Personality Detection from Turkish Texts. Proceedings of the Future Technologies Conference (FTC 2019), Vol. 1, 729–736. Springer.
- Sanli, O., & İlgen, B. (2019). Face Detection and Recognition for Automatic Attendance System. Intelligent Systems and Applications: Proceedings of IntelliSys 2018, Vol. 1, 237–245. Springer.
- İlgen, B. (2018). NLP to Support Social Inclusion of Users with Special Needs. LREC 2018 Legal & Ethics Workshop, Miyazaki, Japan.
- Demirci, F., Karabudak, E., & İlgen, B. (2017). Multi-Document Summarization for Turkish News. Proceedings of the International Artificial Intelligence and Data Processing Symposium (IDAP 2017). IEEE.
- İlgen, B., Adalı, E., & Tantuğ, A. C. (2016). Exploring Feature Sets for Turkish Word Sense Disambiguation. Turkish Journal of Electrical Engineering and Computer Sciences, 24(5), 4391–4405.
- İlgen, B., & Adalı, E. (2014). Exploring the Effect of Bag-of-Words and Bag-of-Bigram Features on Turkish Word Sense Disambiguation. Türkiye Bilişim Vakfı Bilgisayar Bilimleri ve Mühendisliği Dergisi, 7(2), 5–10.
- İlgen, B., Adalı, E., & Tantuğ, A. C. (2013). A Comparative Study to Determine the Effective Window Size of Turkish Word Sense Disambiguation Systems. Information Sciences and Systems 2013, 169–176. Springer.
- İlgen, B., & Adalı, E. (2012). Building Up Lexical Sample Dataset for Turkish Word Sense Disambiguation. Proceedings of the International Symposium on Innovations in Intelligent Systems and Applications (INISTA 2012), 1–5. IEEE.
- İlgen, B., & Adalı, E. (2012). The Impact of Collocational Features in Turkish Word Sense Disambiguation. Proceedings of the IEEE 16th International Conference on Intelligent Engineering Systems (INES 2012), 527–530.
- İlgen, B., & Özkan, D. (2011). Investigation of Several Parameters on Goldbach Partitions. Proceedings of the 2nd International Symposium on Computing in Science and Engineering.
- İlgen, B., & Karaoğlan, B. (2007). Investigation of Zipf’s Law-of-Meaning on Turkish Corpora. Proceedings of the 22nd International Symposium on Computer and Information Sciences (ISCIS 2007), 1–6. IEEE.
Academic Experience
-
Robert Koch Institute, Germany
Centre for Artificial Intelligence in Public Health Research (ZKI-PH)
Postdoctoral Researcher (2023–Present)
Deputy Research Group Leader, Visualization Group (04/2024–03/2026) -
University of Hamburg, Germany
Postdoctoral Researcher, Language Technology Group (2021–2022) -
Istanbul Kültür University, Türkiye
Assistant Professor, Department of Computer Engineering (2016–2021)
Research Leadership & Supervision
My experience includes serving as Deputy Research Group Leader at the Robert Koch Institute, co-supervising doctoral students, and supervising undergraduate and master’s students. I have also contributed to interdisciplinary research projects and funding proposals in biomedical and public health AI.
Teaching
Istanbul Kültür University
Assistant Professor, Department of Computer Engineering
Courses taught included:
- Programming Fundamentals & Object-Oriented Design
- Data Structures & Algorithms
- Machine Learning
- Data Mining
- Discrete Structures
Supervised undergraduate and graduate student projects in AI and software systems.
International Teaching Mobility
- Università degli Studi di Milano (2018) — Intelligent Systems
- Dennis Gabor College (2017) — Object-Oriented Software Development
Earlier Teaching Experience
Research & Teaching Assistant positions at Istanbul Kültür University and Izmir University of Economics (2005–2016), contributing to teaching in AI, programming, algorithms, operating systems, and computer organization.
Contact
Centre for Artificial Intelligence in Public Health Research (ZKI-PH)
Robert Koch-Institut
Ludwig-Witthöft-Straße 14
15745 Wildau, Germany
IlgenB[at]rki[dot]de