BAE Special Seminar, Friday, Jan. 24

Please join us for a special BAE seminar 

Friday, January 24, 2014 
2:10-3:00 pm, 2045 Bainer Hall

Applications of Nonlinear Time Series Analysis in Biological and Agricultural Systems 

Presenter: Ms. Nina Siridova, PhD Student 
Environmental and Agricultural Engineering Department 
Tokyo University of Agriculture and Technology 


Due to increasing successful usage of nonlinear time series analysis (NTSA) methods to analyze and interpret complex signals that naturally arise in many scientific disciplines, NSTA techniques have become attractive to analyze signals produced by biological and agricultural systems. 

As a part of the PhD dissertation work at Tokyo University of Agriculture and Technology, we are investigating the use of photoplethysmograph (PPG) signal to evaluate cardiovascular system performance in humans. A physiological signal derived from cardiovascular system PPG shows extreme complexity due to the interaction of many processes, structure units and feedback loops in human organism. In this study all conventional tools of nonlinear time series analyses, such as reconstructed time delay embedding method, power spectrum, correlation dimension, nonlinear prediction, largest Lyapunov exponent and Wayland test translation error have been applied to PPG. Analysis results gave us valuable quantitative measure of cardiovascular system performance, also provided additional proof of deterministic nature of PPG. 

Similar to PPG, NTSA can be applied for quantitative assessment of other data obtained from biological or agricultural systems such as ergonomics, tillage studies. A couple of examples of use of NSTA in the field of Biological and Agricultural Engineering will be discussed briefly. 


Nina V. Sviridova obtained her Bachelors (2009) and Masters degree (2011) in Applied Mathematics and Informatics from Pacific National University. After graduation, she went to work as a Software Engineer at the Hydro-Meteorological Research Center, developing meteorological satellite image processing software. At the same time in 2011 she joined the Computing Center Far-Eastern Russian Academy of Science to pursue her PhD in Numerical Mathematics. One year later she joined the PhD course in Environmental and Agricultural Engineering Department at Tokyo University of Agriculture and Technology, where her current research project is Nonlinear time series analyses of blood volume change in the vessels. 

Coffee and cookies will be served.