The Laboratory for Network Physiology launches its official website

NetworkPhysiology-logoThe Laboratory for Network Physiology directed by Plamen Ch. Ivanov recently launched its official website. Professor Ivanov, with whom I collaborate closely for the past six years, is leading a unique team of statistical physicists, neuroscientists, applied mathematicians and biomedical engineers that have as their mission to understand how organ systems dynamically interact and collectively behave as a network to produce health or disease. This coordinated effort proposes a new scientific field, Network Physiology, to probe the network of interactions among diverse physiologic systems.

In the website interested readers can find information about the group’s research projects, publications, news, job opportunities and more.

Visit the website here.

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New article published in PLoS ONE: Impact of Stock Market Structure on Intertrade Time and Price Dynamics

Originally published at: http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0092885

A new article we have been working for some time with Dr. Plamen Ivanov was recently published in PLoS ONE. In the article we analyse times between consecutive transactions for a diverse group of stocks registered on the NYSE and NASDAQ markets, and we relate the dynamical properties of the intertrade times with those of the corresponding price fluctuations. We report that market structure strongly impacts the scale-invariant temporal organisation in the transaction timing of stocks, which we have observed to have long-range power-law correlations. Continue reading “New article published in PLoS ONE: Impact of Stock Market Structure on Intertrade Time and Price Dynamics”

In a complex world is it always meaningful to ask why?

Originally posted at: http://greeklish.info/en/world/251

As I make my way through an ocean of stimuli and experiences I observe the subtle changes in my mood and try to explain where they come from and what is causing them. My mind is hardwired to look for causes in a linear way. Big emotions are caused by dramatic life events while minor mood changes can have less significant origins, such as something I ate yesterday or an approaching project deadline. This hunt for external causes keeps my mind busy and the conversations with friends going, but is it always meaningful?

Not many years ago we believed that biological systems strive to maintain a constant state and that observed changes result from external factors that “push” the system away from the desired equilibrium state [1]. Based on this mode of thinking, many cardiologists would still regard heart rate plots A and C as belonging to healthy individuals and consider plot B as problematic. The truth, however is that the constant and regular plots —A and B respectively— come from patients with life-threatening congestive heart failure, and only the seemingly erratic heart rate fluctuations represented in plot B come from a healthy young individual. Continue reading “In a complex world is it always meaningful to ask why?”