Jan Freund

Research Scientist
Institute for Chemistry and Biology of the Marine Environment
University of Oldenburg

Research Interests

My current research is primarily focused on marine ecosystems (algal blooms). I use methods of linear and nonlinear data analysis to extract information and methods of stochastic and nonlinear dynamics to model observed phenomena. (read more)

One of my major research topics is the theoretical description of frequency and phase synchronization with special emphasis on noise-induced effects. These phenomena have applications in neuronal systems, behavioral biology, or laser systems (VCSEL).

Generally I am interested in complexity research involving elements of information theory, symbolic dynamics, and chaotic systems.

Classes

SYNCHRO STOPRO INFCOM TSA PMTB POPDYN KPHELG

Modern Aspects of Synchroinzation Stochastic Processes and Their Applications in Modeling Information and Its Relation to Complexity Time Series Analysis: From Standard to Advanced Physical Models of Animal Motion Populationdynamics Helgoland Lab (hands-on training)

Selected Publications (complete list)

1. J. A. Freund, L. Schimansky-Geier, and P. Hänggi: "Frequency and phase synchronization in stochastic systems". Chaos 13 (2003), 225-238.
   
   
2. J. A. Freund, S. Barbay, S. Lepri, A. Zavatta, and G. Giacomelli: "Noise-induced phase synchronization: Theoretical and experimental results". Fluctuation and Noise Letters 3 (2003), L195-L204.
   
   
3. S. Liepelt and J. A. Freund: "Information processing in noisy burster models". In S. M. Bezrukov, H. Frauenfelder, and F. Moss (eds.): Fluctuations and Noise in Biological, Biophysical, and Biomedical Systems, (Proceedings of the SPIE 5110, 2003), pp. 262-270.
   
   
4. B. Naundorf and J. A. Freund: "Signal detection by means of phase coherence induced through phase resetting". Phys. Rev. E  66 (2002) 040901(R):1-4;
   also in Virtual Journal of Biological Physics Research 4, Oct. 15 (2002).
   
   
5. J. A. Freund, L. Schimansky-Geier, B. Beisner, A. Neiman, D. F. Russell, T. Yakusheva, and F. Moss: "Behavioral stochastic resonance: How the noise from a Daphnia swarm enhances individual prey capture by juvenile paddlefish".J. Theor. Biol. 214 (2002), 71-83.
   
   
6. R. Rozenfeld, J. A. Freund, A. Neiman, and L. Schimansky-Geier: "Noise-induced phase synchronization enhanced by dichotomic noise". Phys. Rev. E  64 (2001), 051107:1-7.
   
   
7. J. A. Freund, J. Kienert, L. Schimansky-Geier, B. Beisner, A. Neiman, D. F. Russell, T. Yakusheva, and F. Moss: "Behavioral stochastic resonance: How a noisy army betrays its outpost". Phys. Rev. E  63 (2001), 031910:1-11.
   
   
8. J. A. Freund, A. B. Neiman, and L. Schimansky-Geier: "Analytic description of noise-induced phase synchronization". Europhys. Lett. 50 (2000), 8-14.