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Michael Biehl,    selected talks and posters

to be updated soon

Note:
Available presentations may be downloaded for personal use or teaching purposes. In any other case, please contact the author (e-mail: m.biehl_at_rug.nl)


Machine Learning

· LVQ and relevance learning: recent extensions and applications in bioinformatics and medicine (ppt presentation)
Keynote talk at the "X-meeting" 2008 in Salvador de Bahia / Brazil (Brasilian Associciation for Bioinformatics)

· Analysis of tiling microarray data by LVQ and relevance learning (ppt presentation)
This talk was first given at the Groningen Bioinformatics Centre, it introduces the LVQ approach and relevance learing and presents first results of a collaboration with Rainer Breitling and Yang Li. The downloaded version was presented at the MPI for Physics of Complex Systems in Dresden during the Seminar "From Statistical Physics to Computer Science" in October 2007.

· Classification of boar sperm head images using Learning Vector Quantization (ppt presentation)
This talk was first given at the ESANN conference in Brugge, 2006. It deals with an LVQ approach to a (veterinary) medical image classification problem. Collaboration with L. Sanchez, N. Petkov, P. Pasma, and M. Pijl.

· Dynamical analysis of LVQ type learning rules (ppt presentation)
The presentation is a short version of the one below (The dyanmics of LVQ). It was first given at the International Workshop on the Self-Organizing Map in Paris, WSOM 2005. A collaboration with Barbara Hammer and Anarta Ghosh.

· The dynamics of Learning Vector Quantization (ppt presentation)
The presentation summarizes our analysis of the dynamics and generalization ability of several LVQ algorithms in a model situation. The statistical physics approach is explained and applied to LVQ1 (as proposed by Kohonen) and variations thereof.
(in collaboration with Barbara Hammer and Anarta Ghosh)

· Efficient training in high-dimensional weight space (ppt presentation)
This talk introduces and analyses a PCA-based training scheme for multilayered neural networks which overcomes, to a large extent, the problem of delayed specialization and plateaus in the learning curve. Its potential application for model selection is briefly discussed.
(in collaboration with Robert Urbanczik and Christoph Bunzmann)

· Learning from examples in Neural Gas and Vector Quantization (pdf poster)
This poster contribution to the DPG Frühjahrstagung 2006 in Dresden presents the formalis and first result of our theoretical analysis of Neural Gas algorithms.
(together with A. Witoelaar and A. Ghosh)


Computational Physics

· The formation of nano-structured surface alloys (ppt presentation)
Invited talk at the IPAM Workshop on multiscale modelling in condensed matter and materials siences at the University of California, Los Angeles, 2005. After a brief introduction to the off-lattice KMC method and earlier results, the formation of nano-structured surface alloys in ternary material systems is discussed.
(in collaboration with M. Kotrla, F. Much, T. Volkmann, M. Walther, and S. Weber)

· Lattice gas simulations of epitaxial crystal growth (ppt presentation)
An invited presentation at the MFO Mini-Workshop on Multiscale Modeling in Epitaxial Growth in Oberwolfach, 2004. The talk gives a brief introduction to lattice gas models of crystal growth and the basic concepts of Kinetic Monte Carlo simulations. As one example, the investigation of unstable growth and its scaling laws is discussed in the framework of simple-cubic model crystals. The second illustration concerns the interplay of the growth dynamics with competing surface reconstructions on (001)-surfaces of II-VI semiconductor materials (zincblende lattice).

· Off-lattice KMC simulations of strained hetero-epitaxial growth (ppt presentation)
An invited presentation at the MFO Mini-Workshop on Multiscale Modeling in Epitaxial Growth in Oberwolfach, 2004. It discusses the application of lattice-free Kinetic Monte Carlo techniques for the simulation of hetero-epitaxial crystal growth. Emphasis is on the method with example applications in the context of misfit dislocations and Stranski-Krastanov growth.
(in collaboration with M. Ahr, W. Kinzel, F. Much, and C. Vey)

· Simulation of heteroepitaxial growth and misfit dislocations (pdf poster)
This poster contribution to the DPG Frühjahrstagung 2006 in Dresden summarizes recent findings in the context of the formation of misfit dislocations and their influence on the film growth.
(together with M. Walther, F. Much, and C. Vey)

· Simulation of heteroepitaxial growth and surface alloy formation (pdf poster)
This poster contribution to the DPG Frühjahrstagung 2006 in Dresden summarizes our latest results in the context of the formation of 2D nanostructured surface alloys in ternary material systems.
(together with S. Weber, M. Kotrla, and T. Volkmann)