Latest news:

1. April 13 2025, I successfully ran my 33th (!!) Rotterdam marathon. My finish video is available here: I'm the rightmost runner. For even more details, please scroll down.
2. My, 21 pages counting, on invitation written, paper entitled "Present-day Cybersecurity: actual challenges and solution directions" has been published November 19 2014: it is a chapter in the Intech Open (Access) book with title "Key Issues in Network Protocols and Security" with publication date April 2025.
3. Our paper entitled "Unmasking Phishing Attempts, A Study on Detection in Spanish Emails" has been published November 19 2024 within the Springer LNCS series, volume 15369 as part of the proceedings of the 27th Iberoamerican Congress on Progress in Pattern Recognition, Image Analysis, Computer Vision, and Applications, CIARP 2024, held in Talca, Chile, during November 26-29, 2024.
   
4. October 8 2024, the Nobel Price of Physics 2024 has been awarded to two AI-pioneers/giants named John. J. Hopfield and Geoffrey E. Hinton. I'm truly excited about this news since my 1996 PhD-thesis was largely devoted to a further analysis and generalization of the recurrent neural models John Hopfield described in the 1980-ies.

General overview:

My LIST OF MY PUBLICATIONS (version November 20 2024) contains detailed information about nearly all my publications. My research output (including my most recent articles published) can also be inspected from this TUDelft website (only output resulting from my time at TUDelft) or from this scholar.google website (also includes research output produced at other institutes).

Below a description of my topics of research is provided, grouped in 4 clusters:

I. Development of Intelligent Data Analysis (IDA) methods for Improved Decision Making

• Theories on the combination of Probability Theory and Statistics on Fuzzy Sets like probabilistic fuzzy entropy, statistical fuzzy histograms, statistical fuzzy decision trees, statistical fuzzy information sources and, more in general, probabilistic fuzzy systems; see, e.g., our 2012 IEEE Transactions on Fuzzy Systems publication. Most of this work was executed in close cooperation with Uzay Kaymak.
  
• Visualizations of Concept Relations:  attempts to construct aggregated knowledge structures (like Associative Concept Maps) representing the essential knowledge as induced from a large corpus of (un)structured information sources. For details, see the work done by Nees Jan van Eck and Ludo Waltman at www.vosviewer.com
• Simulated Big Bounce (for a nice simulation example see here!!): is a new metaheuristic proposed by former PhD student Mohsen Davarynejad for finding the gobal optimum of complex (high-dimensional) continuous functions by balancing exploration and exploitation.
• More recently, I co-authored, often in close cooperation with Vitali Herrera-Semenets and Lázaro Bustio-Martínez, among others, various papers describing new types of Machine Learning algorithms for detecting cyberspace-fraude like intrusion attempts, social engineering attempts, and more. See my recent research output.

II. Theory and Applications of Complex Systems (with emergent properties based on self-organisation at the edge of order & chaos)

• Concerns the theory especially pioneered at the famous Sante Fe Institute concerning the paradigm of looking bottom-up instead of top down: systems consisting of many interacting components (from atoms till human beings) may show complex emergent phenomena (from temperature and pressure in gases till dynamic markets and exciting paradigm shifting research outcomes in well-performaing research communities): see e.g. my publication "Inverse Infrastructures at the Edge of Order and Chaos, an Analytic Framework", chapter 2 of Tineke Egyedi and Donna Mahos (eds.) Inverse Infrastructures: Disrupting Networks from Below, Edward Elgar, 2010. 
• When I started in this field, I looked at generalized (recurrent) neural networks from a mathematical-physical perspective: it resulted into my PhD work (original repaired version) on "Neural Relaxation Dynamics" (a topic related to Simulated Annealing) which focused on two types of neural networks:
  • Recurrent Artificial Neural Networks, especially, generalizations of Hopfield and Hopfield-Lagrange models showing emerging collective computational abilities; a JAVA applet for the famous Travelling Salesman Problem (TSP) is available here;
  • Modifications of Elastic Nets: a nice JAVA applet is available of the original elastic net for solving the TSP.
• Later on, this scope broadened towards applications with other complex systems' techniques in the field of Computational Intelligence like
  • Ants Algorithms for Bankruptcy Prediction and Bond Rating;
  • Particle Swarm Algorithms for Portfolio Optimization;
  • Genetic Algorithms for Index Tracking.

III. (Information Systems) Safety, Security, Risk and Related Topics

• Developing a holistic, socio-technical view on Cyberspace and Cybersecurity;
• (Quantitative) modeling of all kinds of risk;
• Cyber Security solutions for IT-infrastructures, in domains like government, transport & logistics, finance, healthcare, energy supply;
• Trust enhancing algorithms in mobile and P2P networks;
• Resilience enhancement of Cyber Warfare Infrastructures;
• Threat and fraud detection in Cyberspace (see also above under IDA methods).

IV. (Other) Applications in Finance, Sustainable Development, Philosophy, Healthcare (in many cases by using IDA tools):

News Driven Financial Time Series Analysis; Scaling Laws for Operational Risk Analysis; Visual Explorations in Finance with Self Organizing Maps, Google Maps, ...; Modeling Sustainable Development and Decision Making using Fuzzy Systems; Providing Intelligent Agents with Moral Reasoning Capabilities; Privacy Enhancing Technologies for Dynamic Informed Consent Decision Making;  ICT Tools for supporting Independent Living; Workflow Management and the Electronic Patient Record for realizing Client-Centered Healthcare; Improving Business Performance by KPI-based analysis of business processes performance; Data mining for Forensics and Intrusion Detection; Towards a production environment for (mobile) Apps in the Port of Rotterdam.