News

• January 18, 2012. VOSviewer version 1.4.1 has been released and is available at www.vosviewer.com.
• December 14, 2011. The paper Universality of citation distributions revisited by Ludo Waltman, Nees Jan van Eck, and Anthony van Raan has been published in volume 63, issue 1 of the Journal of the American Society for Information Science and Technology.
• December 5, 2011. The paper A mathematical analysis of the long-run behavior of genetic algorithms for social modeling by Ludo Waltman and Nees Jan van Eck has been accepted for publication in Soft Computing.
• November 16, 2011. The paper Economic modeling using evolutionary algorithms: The effect of a binary encoding of strategies by Ludo Waltman, Nees Jan van Eck, Rommert Dekker, and Uzay Kaymak has been published in volume 21, issue 5 of the Journal of Evolutionary Economics.
• November 3, 2011. The paper Text mining and visualization using VOSviewer by Nees Jan van Eck and Ludo Waltman has been published in volume 7, issue 3 of the ISSI Newsletter.
• October 13, 2011. Today I have successfully defended my PhD thesis. The slides of my introductory presentation are available here.
• October 13, 2011. The paper Globalisation of science in kilometres by Ludo Waltman, Robert Tijssen, and Nees Jan van Eck has been published in volume 5, issue 4 of the Journal of Informetrics.
• October 13, 2011. The paper The detection of "hot regions" in the geography of science: A visualization approach by using density maps by Lutz Bornmann and Ludo Waltman has been published in volume 5, issue 4 of the Journal of Informetrics.
• September 13, 2011. The paper A recursive field-normalized bibliometric performance indicator: An application to the field of library and information science by Ludo Waltman, Erjia Yan, and Nees Jan van Eck has been published in volume 89, issue 1 of Scientometrics.
• September 11, 2011. The paper The inconsistency of the h-index by Ludo Waltman and Nees Jan van Eck has been accepted for publication in the Journal of the American Society for Information Science and Technology.
• September 10, 2011. VOSviewer version 1.4.0 has been released and is available at www.vosviewer.com.
• September 1, 2011. The paper Universality of citation distributions revisited by Ludo Waltman, Nees Jan van Eck, and Anthony van Raan has been accepted for publication in the Journal of the American Society for Information Science and Technology.
• August 10, 2011. The paper On the correlation between bibliometric indicators and peer review: Reply to Opthof and Leydesdorff by Ludo Waltman, Nees Jan van Eck, Thed van Leeuwen, Martijn Visser, and Anthony van Raan has been published in volume 88, issue 3 of Scientometrics.
• June 24, 2011. The paper A recursive field-normalized bibliometric performance indicator: An application to the field of library and information science by Ludo Waltman, Erjia Yan, and Nees Jan van Eck has been accepted for publication in Scientometrics.
• June 13, 2011. VOSviewer version 1.3.2 has been released and is available at www.vosviewer.com.
• May 30, 2011. The paper On the correlation between bibliometric indicators and peer review: Reply to Opthof and Leydesdorff by Ludo Waltman, Nees Jan van Eck, Thed van Leeuwen, Martijn Visser, and Anthony van Raan has been accepted for publication in Scientometrics.
• May 17, 2011. The paper Globalisation of science in kilometres by Ludo Waltman, Robert Tijssen, and Nees Jan van Eck has been accepted for publication in the Journal of Informetrics.
• May 11, 2011. The correspondence Collaborations span 1,553 kilometres by Robert Tijssen, Ludo Waltman, and Nees Jan van Eck has been published in volume 473, number 7346 of Nature. A preprint of the full paper is available in the arXiv.
• April 23, 2011. The paper Towards a new crown indicator: An empirical analysis by Ludo Waltman, Nees Jan van Eck, Thed van Leeuwen, Martijn Visser, and Anthony van Raan has been published in volume 87, issue 3 of Scientometrics.
• April 19, 2011. The paper The detection of "hot regions" in the geography of science: A visualization approach by using density maps by Lutz Bornmann and Ludo Waltman has been accepted for publication in the Journal of Informetrics.
• March 9, 2011. VOSviewer version 1.3.1 has been released and is available at www.vosviewer.com.
• February 18, 2011. The paper Relations between the shape of a size-frequency distribution and the shape of a rank-frequency distribution by Leo Egghe and Ludo Waltman has been published in volume 47, issue 2 of Information Processing and Management.
• February 3, 2011. The paper Towards a new crown indicator: An empirical analysis by Ludo Waltman, Nees Jan van Eck, Thed van Leeuwen, Martijn Visser, and Anthony van Raan has been accepted for publication in Scientometrics.
• January 24, 2011. VOSviewer version 1.3.0 has been released and is available at www.vosviewer.com.
• December 24, 2010. The paper Towards a new crown indicator: Some theoretical considerations by Ludo Waltman, Nees Jan van Eck, Thed van Leeuwen, Martijn Visser, and Anthony van Raan has been published in volume 5, issue 1 of the Journal of Informetrics.
• November 12, 2010. The paper A comparison of two techniques for bibliometric mapping: Multidimensional scaling and VOS by Nees Jan van Eck, Ludo Waltman, Rommert Dekker, and Jan van den Berg has been published in volume 61, issue 12 of the Journal of the American Society for Information Science and Technology.
• September 10, 2010. The slides of the presentation that I gave today at the 11th International Conference on Science and Technology Indicators are available here.
• September 9, 2010. The paper A unified approach to mapping and clustering of bibliometric networks by Ludo Waltman, Nees Jan van Eck, and Ed Noyons has been published in volume 4, issue 4 of the Journal of Informetrics.
• September 7, 2010. The paper Towards a new crown indicator: An empirical analysis by Ludo Waltman, Nees Jan van Eck, Thed van Leeuwen, Martijn Visser, and Anthony van Raan has been submitted.
• August 25, 2010. The paper Towards a new crown indicator: Some theoretical considerations by Ludo Waltman, Nees Jan van Eck, Thed van Leeuwen, Martijn Visser, and Anthony van Raan has been accepted for publication in the Journal of Informetrics.
• July 16, 2010. The paper A comparison of two techniques for bibliometric mapping: Multidimensional scaling and VOS by Nees Jan van Eck, Ludo Waltman, Rommert Dekker, and Jan van den Berg has been accepted for publication in the Journal of the American Society for Information Science and Technology.
• July 15, 2010. The paper A unified approach to mapping and clustering of bibliometric networks by Ludo Waltman, Nees Jan van Eck, and Ed Noyons has been accepted for publication in the Journal of Informetrics.
• June 15, 2010. VOSviewer version 1.2.1 has been released and is available at www.vosviewer.com.
• June 15, 2010. The paper The relation between Eigenfactor, audience factor, and influence weight by Ludo Waltman and Nees Jan van Eck has been published in volume 61, issue 7 of the Journal of the American Society for Information Science and Technology.
• June 13, 2010. The paper Software survey: VOSviewer, a computer program for bibliometric mapping by Nees Jan van Eck and Ludo Waltman has been published in volume 84, issue 2 of Scientometrics.
• June 9, 2010. The paper Rivals for the crown: Reply to Opthof and Leydesdorff by Anthony van Raan, Thed van Leeuwen, Martijn Visser, Nees Jan van Eck, and Ludo Waltman has been published in volume 4, issue 3 of the Journal of Informetrics.
• June 5, 2010. The paper A unified approach to mapping and clustering of bibliometric networks by Ludo Waltman, Nees Jan van Eck, and Ed Noyons has been submitted.
• May 24, 2010. The paper Economic modeling using evolutionary algorithms: The effect of a binary encoding of strategies by Ludo Waltman, Nees Jan van Eck, Rommert Dekker, and Uzay Kaymak has been accepted for publication in the Journal of Evolutionary Economics.
• May 18, 2010. VOSviewer version 1.2.0 has been released and is available at www.vosviewer.com.
• March 31, 2010. The paper Rivals for the crown: Reply to Opthof and Leydesdorff by Anthony van Raan, Thed van Leeuwen, Martijn Visser, Nees Jan van Eck, and Ludo Waltman has been accepted for publication in the Journal of Informetrics.
• March 22, 2010. The paper Relations between the shape of a size-frequency distribution and the shape of a rank-frequency distribution by Leo Egghe and Ludo Waltman has been accepted for publication in Information Processing and Management.
• March 15, 2010. The paper The relation between Eigenfactor, audience factor, and influence weight by Ludo Waltman and Nees Jan van Eck has been accepted for publication in the Journal of the American Society for Information Science and Technology.
• March 4, 2010. The paper A comparison of two techniques for bibliometric mapping: Multidimensional scaling and VOS by Nees Jan van Eck, Ludo Waltman, Rommert Dekker, and Jan van den Berg has been submitted.
• March 2, 2010. The paper Automatic term identification for bibliometric mapping by Nees Jan van Eck, Ludo Waltman, Ed Noyons, and Reindert Buter has been published in volume 82, issue 3 of Scientometrics.
• January 6, 2010. VOSviewer version 1.1.0 has been released and is available at www.vosviewer.com.
• December 30, 2009. The paper The relation between Eigenfactor, audience factor, and influence weight by Ludo Waltman and Nees Jan van Eck has been submitted.
• December 10, 2009. The paper Software survey: VOSviewer, a computer program for bibliometric mapping by Nees Jan van Eck and Ludo Waltman has been accepted for publication in Scientometrics.
• October 27, 2009. The paper A simple alternative to the h-index by Ludo Waltman and Nees Jan van Eck has been published in volume 5, issue 3 of the ISSI Newsletter.
• October 8, 2009. The slides of the presentation that I gave today during the Modelling Science workshop in Amsterdam are available here.
• September 23, 2009. The slides of the lecture that I gave today during the CWTS Graduate Course are available here.
• September 23, 2009. The paper Relations between the shape of a size-frequency distribution and the shape of a rank-frequency distribution by Leo Egghe and Ludo Waltman has been submitted.
• August 26, 2009. The technical report A simple alternative to the h-index by Ludo Waltman and Nees Jan van Eck has been published in the ERIM Report Series Research in Management and is available online.
• August 19, 2009. The letter to the editor On the proper understanding of the limiting behavior of generalizations of the h- and g-indices by Nees Jan van Eck and Ludo Waltman has been published in volume 3, issue 4 of the Journal of Informetrics. The letter is a rejoinder to a letter by Marek Gagolewski in which our paper Generalizing the h- and g-indices is criticized.
• August 19, 2009. The paper Some comments on Egghe's derivation of the impact factor distribution by Ludo Waltman and Nees Jan van Eck has been published in volume 3, issue 4 of the Journal of Informetrics. The paper is a comment on the paper Mathematical derivation of the impact factor distribution by Leo Egghe.
• July 31, 2009. The paper VOSviewer: A computer program for bibliometric mapping by Nees Jan van Eck and Ludo Waltman has been submitted.
• July 15, 2009. The paper How to normalize co-occurrence data? An analysis of some well-known similarity measures by Nees Jan van Eck and Ludo Waltman has been published in volume 60, issue 8 of the Journal of the American Society for Information Science and Technology.
• July 9, 2009. The new VOSviewer web site www.vosviewer.com has been launched.
• June 9, 2009. The technical report Economic modeling using evolutionary algorithms: The effect of a binary encoding of strategies by Ludo Waltman, Nees Jan van Eck, Rommert Dekker, and Uzay Kaymak has been published in the ERIM Report Series Research in Management and is available online.
• June 1, 2009. As of today, I am working as a researcher at the Centre for Science and Technology Studies of Leiden University.
• May 19, 2009. The paper Economic modeling using evolutionary algorithms: The effect of a binary encoding of strategies by Ludo Waltman, Nees Jan van Eck, Rommert Dekker, and Uzay Kaymak has been submitted.
• May 6, 2009. The paper Some comments on Egghe's derivation of the impact factor distribution by Ludo Waltman and Nees Jan van Eck has been accepted for publication in the Journal of Informetrics. The paper is a comment on the paper Mathematical derivation of the impact factor distribution by Leo Egghe.
• April 20, 2009. The paper A taxonomy of bibliometric performance indicators based on the property of consistency by Ludo Waltman and Nees Jan van Eck has been accepted for poster presentation at the 12th International Conference of the International Society for Scientometrics and Informetrics. A somewhat more elaborate version of the paper is available as a technical report.
• April 13, 2009. A map showing relations among 5000 major scientific journals has been constructed using the VOS mapping technique. The map is based on co-citation data. Click here to view the map.
• March 19, 2009. The technical report Some comments on Egghe's derivation of the impact factor distribution by Ludo Waltman and Nees Jan van Eck has been published in the ERIM Report Series Research in Management and is available online.
• March 19, 2009. The technical report A taxonomy of bibliometric performance indicators based on the property of consistency by Ludo Waltman and Nees Jan van Eck has been published in the ERIM Report Series Research in Management and is available online.
• March 19, 2009. The technical report A mathematical analysis of the long-run behavior of genetic algorithms for social modeling by Ludo Waltman and Nees Jan van Eck has been published in the ERIM Report Series Research in Management and is available online.
• March 17, 2009. The paper Some comments on Egghe's derivation of the impact factor distribution by Ludo Waltman and Nees Jan van Eck has been submitted.
• March 9, 2009. The paper VOSviewer: A computer program for bibliometric mapping by Nees Jan van Eck and Ludo Waltman has been accepted for presentation at the 12th International Conference of the International Society for Scientometrics and Informetrics. VOSviewer is available here.
• February 27, 2009. The letter to the editor On the proper understanding of the limiting behavior of generalizations of the h- and g-indices by Nees Jan van Eck and Ludo Waltman has been accepted for publication in the Journal of Informetrics. The letter is a rejoinder to a letter by Marek Gagolewski in which our paper Generalizing the h- and g-indices is criticized.
• February 20, 2009. The paper How to normalize co-occurrence data? An analysis of some well-known similarity measures by Nees Jan van Eck and Ludo Waltman has been accepted for publication in the Journal of the American Society for Information Science and Technology.
• February 19, 2009. The technical report VOSviewer: A computer program for bibliometric mapping by Nees Jan van Eck and Ludo Waltman has been published in the ERIM Report Series Research in Management and is available online.
• January 25, 2009. The paper VOSviewer: A computer program for bibliometric mapping by Nees Jan van Eck and Ludo Waltman has been submitted. VOSviewer is available here.
• January 22, 2009. The technical report How to normalize co-occurrence data? An analysis of some well-known similarity measures by Nees Jan van Eck and Ludo Waltman has been published in the ERIM Report Series Research in Management and is available online.
• January 7, 2009. The paper How to normalize co-occurrence data? An analysis of some well-known similarity measures by Nees Jan van Eck and Ludo Waltman has been submitted.
• December 11, 2008. The paper Robust evolutionary algorithm design for socio-economic simulation: Some comments by Ludo Waltman and Nees Jan van Eck has been published in volume 33, issue 1 of Computational Economics.
• December 5, 2008. The technical report Automatic term identification for bibliometric mapping by Nees Jan van Eck, Ludo Waltman, Ed Noyons, and Reindert Buter has been published in the ERIM Report Series Research in Management and is available online.
• November 30, 2008. The paper Automatic term identification for bibliometric mapping by Nees Jan van Eck, Ludo Waltman, Ed Noyons, and Reindert Buter has been submitted.
• November 12, 2008. The paper Some comments on the journal weighted impact factor proposed by Habibzadeh and Yadollahie by Ludo Waltman and Nees Jan van Eck has been published in volume 2, issue 4 of the Journal of Informetrics.
• November 12, 2008. The paper Generalizing the h- and g-indices by Nees Jan van Eck and Ludo Waltman has been published in volume 2, issue 4 of the Journal of Informetrics.
• October 24, 2008. As of today, I have an affiliation with the Centre for Science and Technology Studies of Leiden University through a hospitality agreement.
• September 18, 2008. The slides of the presentation that I gave today at the 10th International Conference on Science and Technology Indicators are available here. The term map of the operations research field that was shown in the presentation is available here.
• September 18, 2008. The slides of the presentation that Nees Jan van Eck gave today at the 10th International Conference on Science and Technology Indicators are available here. The maps that were shown in the presentation are available here. The VOS visualization software is available here.
• September 12, 2008. The technical report Generalizing the h- and g-indices by Nees Jan van Eck and Ludo Waltman has been published in the ERIM Report Series Research in Management and is available online.
• September 9, 2008. The paper Generalizing the h- and g-indices by Nees Jan van Eck and Ludo Waltman has been accepted for publication in the Journal of Informetrics.
• August 29, 2008. The paper Q-learning agents in a Cournot oligopoly model by Ludo Waltman and Uzay Kaymak has been published in volume 32, issue 10 of the Journal of Economic Dynamics and Control.
• August 1, 2008. The paper Generalizing the h- and g-indices by Nees Jan van Eck and Ludo Waltman has been submitted.
• July 17, 2008. The paper Appropriate similarity measures for author cocitation analysis by Nees Jan van Eck and Ludo Waltman has been published in volume 59, issue 10 of the Journal of the American Society for Information Science and Technology.
• June 30, 2008. Two abstracts have been accepted for presentation at the 10th International Conference on Science and Technology Indicators. One abstract is entitled An experimental comparison of bibliometric mapping techniques and is written by Nees Jan van Eck, Ludo Waltman, Rommert Dekker, and Jan van den Berg. The other abstract is entitled Automatic term identification for bibliometric mapping and is written by Nees Jan van Eck, Ludo Waltman, Ed Noyons, and Reindert Buter.
• June 28, 2008. The slides of the presentation that I gave today at the 14th International Conference on Computing in Economics and Finance are available here. The slides of the presentation that Nees Jan van Eck gave today at the 14th International Conference on Computing in Economics and Finance are available here.
• June 12, 2008. The paper Some comments on the journal weighted impact factor proposed by Habibzadeh and Yadollahie by Ludo Waltman and Nees Jan van Eck has been accepted for publication in the Journal of Informetrics. The paper is a comment on a paper by Farrokh Habibzadeh and Mahboobeh Yadollahie recently published in the Journal of Informetrics.
• May 26, 2008. The paper Robust evolutionary algorithm design for socio-economic simulation: Some comments by Ludo Waltman and Nees Jan van Eck has been accepted for publication in Computational Economics. The paper is a comment on two papers by Floortje Alkemade, Han La Poutré, and Hans Amman (published in Computational Economics and Computational Intelligence) and on a correction of these papers (to be published in Computational Economics).
• April 3, 2008. The slides of the presentation that I gave today at the Tinbergen Institute Lunch Seminar are available here.
• March 10, 2008. The papers An algorithm for calculating the long-run behavior of genetic algorithms in economic modeling and Equilibria in first-price sealed-bid auctions of multiple heterogeneous objects: a numerical approach, both by Ludo Waltman and Nees Jan van Eck, have been accepted for presentation at the 14th International Conference on Computing in Economics and Finance.
• February 24, 2008. The paper Appropriate similarity measures for author cocitation analysis by Nees Jan van Eck and Ludo Waltman has been accepted for publication in the Journal of the American Society for Information Science and Technology.
• February 16, 2008. A revised version of the paper Appropriate similarity measures for author cocitation analysis by Nees Jan van Eck and Ludo Waltman has been submitted to the Journal of the American Society for Information Science and Technology.
• January 24, 2008. The slides of the presentation that I gave today at the Workshop on Agent-Based Approaches in Economics at Erasmus University Rotterdam are available here.
• January 16, 2008. The technical report Appropriate similarity measures for author cocitation analysis by Nees Jan van Eck and Ludo Waltman has been published in the ERIM Report Series Research in Management and is available online.
• January 8, 2008. The paper Q-learning agents in a Cournot oligopoly model by Ludo Waltman and Uzay Kaymak has been accepted for publication in the Journal of Economic Dynamics and Control.
• December 21, 2007. A revised version of the paper Q-learning agents in a Cournot oligopoly model by Ludo Waltman and Uzay Kaymak has been submitted to the Journal of Economic Dynamics and Control.
• December 12, 2007. The brief communication Appropriate similarity measures for author cocitation analysis by Nees Jan van Eck and Ludo Waltman has been submitted to the Journal of the American Society for Information Science and Technology.
• October 15, 2007. The paper Bibliometric mapping of the computational intelligence field by Nees Jan van Eck and Ludo Waltman has been published in volume 15, issue 5 of the International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems.
• October 8, 2007. A revised version of the paper Q-learning agents in a Cournot oligopoly model by Ludo Waltman and Uzay Kaymak has been submitted to the Journal of Economic Dynamics and Control.
• August 27, 2007. The brief communication Some comments on the question whether co-occurrence data should be normalized by Ludo Waltman and Nees Jan van Eck has been published in volume 58, issue 11 of the Journal of the American Society for Information Science and Technology.
• June 24, 2007. The slides of the presentation Applying ideas from homogeneity analysis to visualize similarity data, which will be given at the Correspondence Analysis and Related Methods (CARME) conference on June 26, are available online. The CARME conference takes place at Erasmus University Rotterdam from July 25 to July 27.
• June 4, 2007. A MATLAB implementation and a C implementation of VOS have been made available online. VOS is a method for visualizing similarities between objects that I developed together with Nees Jan van Eck. The method has been used in a number of our publications.
• May 10, 2007. The technical report Bibliometric mapping of the computational intelligence field by Nees Jan van Eck and Ludo Waltman has been published in the ERIM Report Series Research in Management and is available online.
• April 26, 2007. The slides of the presentation that I gave today at the Tinbergen Institute Lunch Seminar are available here.
• March 28, 2007. The brief communication Some comments on the question whether co-occurrence data should be normalized by Ludo Waltman and Nees Jan van Eck, which is forthcoming in the Journal of the American Society for Information Science and Technology, has been published as a technical report in the ERIM Report Series Research in Management and is available online.
• March 20, 2007. The paper Bibliometric mapping of the computational intelligence field by Nees Jan van Eck and Ludo Waltman has been conditionally accepted for publication in a special issue of the International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems.
• March 4, 2007. Loet Leydesdorff has written a reply to our brief communication Some comments on the question whether co-occurrence data should be normalized. Both our brief communication and Leydesdorff's reply are available at Leydesdorff's website.
• February 1, 2007. I have become a member of the management team of the Econometric Institute.
• December 31, 2006. The paper Bibliometric mapping of the computational intelligence field by Nees Jan van Eck and Ludo Waltman has been submitted for publication in a special issue of the International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems.
• December 22, 2006. The brief communication Some comments on the question whether co-occurrence data should be normalized by Ludo Waltman and Nees Jan van Eck has been accepted for publication in the Journal of the American Society for Information Science and Technology.
• December 2, 2006. The paper A theoretical analysis of cooperative behavior in multi-agent Q-learning by Ludo Waltman and Uzay Kaymak has been accepted for publication in Proceedings of the 2007 IEEE International Symposium on Approximate Dynamic Programming and Reinforcement Learning.
• November 3, 2006. The paper Visualizing the computational intelligence field by Nees Jan van Eck, Ludo Waltman, Jan van den Berg, and Uzay Kaymak has been published in IEEE Computational Intelligence Magazine.
• September 27, 2006. The extended abstract On the visualization of the soft computing knowledge domain by Nees Jan van Eck, Ludo Waltman, Jan van den Berg, and Uzay Kaymak has been published in Proceedings of the Symposium on Fuzzy Systems in Computer Science 2006.
• August 22, 2006. The paper Visualizing the computational intelligence field by Nees Jan van Eck, Ludo Waltman, Jan van den Berg, and Uzay Kaymak has been submitted to IEEE Computational Intelligence Magazine.
• August 19, 2006. The paper VOS: a new method for visualizing similarities between objects by Nees Jan van Eck and Ludo Waltman has been accepted for publication in Proceedings of the 30th Annual Conference of the German Classification Society.
• May 26, 2006. A revised version of the paper Q-learning agents in a Cournot oligopoly model by Ludo Waltman and Uzay Kaymak has been submitted to the Journal of Economic Dynamics and Control.
• April 27, 2006. The paper VOS: a new method for visualizing similarities between objects by Nees Jan van Eck and Ludo Waltman has been submitted for publication in Proceedings of the 30th Annual Conference of the German Classification Society.
• April 14, 2006. The paper Visualizing the WCCI 2006 knowledge domain by Nees Jan van Eck, Ludo Waltman, Jan van den Berg, and Uzay Kaymak has been completed. The paper will be published in Proceedings of the 2006 IEEE International Conference on Fuzzy Systems.
• April 5, 2006. The technical report VOS: a new method for visualizing similarities between objects by Nees Jan van Eck and Ludo Waltman has been completed. The report has been published in the ERIM Report Series Research in Management and is available online.
• February 28, 2006. I have completed my PhD research proposal. The proposed research is concerned with bidding strategies in auctions of multiple heterogeneous items.
• February 1, 2006. The technical report A theoretical analysis of cooperative behavior in multi-agent Q-learning by Ludo Waltman and Uzay Kaymak has been completed. The report has been published in the ERIM Report Series Research in Management and is available online.
• September 9, 2005. The final version of an extended abstract of the paper A novel algorithm for visualizing concept associations by Nees Jan van Eck, Ludo Waltman, and Jan van den Berg has been completed. The abstract will be published in Proceedings of the 17th Belgian-Dutch Conference on Artificial Intelligence.
• August 24, 2005. An extended abstract of the paper A novel algorithm for visualizing concept associations by Nees Jan van Eck, Ludo Waltman, and Jan van den Berg has been accepted for poster presentation at the 17th Belgian-Dutch Conference on Artificial Intelligence.
• August 24, 2005. I have moved from room H16-20 to room H9-13.
• July 12, 2005. I am back from holiday. Some pictures are available here.
• June 24, 2005. I am going on holiday from June 25 to July 10.
• June 14, 2005. An extended abstract of the paper A novel algorithm for visualizing concept associations by Nees Jan van Eck, Ludo Waltman, and Jan van den Berg has been submitted to the 17th Belgian-Dutch Conference on Artificial Intelligence.
• May 31, 2005. The final version of the paper Fuzzy histograms: a statistical analysis by Ludo Waltman, Uzay Kaymak, and Jan van den Berg has been completed. The paper will be published in Proceedings of the 4th Conference of the European Society for Fuzzy Logic and Technology.
• May 15, 2005. The final version of the paper A novel algorithm for visualizing concept associations by Nees Jan van Eck, Ludo Waltman, and Jan van den Berg has been completed. The paper will be presented at the 6th International Workshop on Theory and Applications of Knowledge Management and will be published in Proceedings of the 16th International Workshop on Database and Expert Systems Applications.
• April 1, 2005. I have started as a PhD student at the Faculty of Economics of Erasmus University Rotterdam. The name of my research project is Lotting strategies for electronic sourcing.
• March 31, 2005. I have finished the master program Informatics & Economics at Erasmus University Rotterdam. My master thesis A theoretical analysis of probabilistic fuzzy systems is available here.