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December 26, 2011 Comments (0)

Call for papers: Special issue of JSSC on Complex Systems and Sports, 2011/12/31 ASSYSTComplexity One of the main goals of the ASSYST Coordination Action is to promote Complex Systems for Socially Intelligent ICT (COSI-ICT) and, more generally, Complex Systems (CS) Science in Europe and Worldwide. We do this by communicating widely with scientists, policy makers, and business people, and by...

Complex Systems: A Survey

December 9, 2011 Comments (0)

A complex system is a system composed of many interacting parts, often called agents, which displays collective behavior that does not follow trivially from the behaviors of the individual parts. Examples include condensed matter systems, ecosystems, stock markets and economies, biological evolution, and indeed the whole of human society. Substantial progress has been made in the quantitative...

Building a Science of Cities

December 9, 2011 Comments (0)

Our understanding of cities is being transformed by new approaches from the complexity sciences (Batty, 2005). Here we review progress, sketching the background beginning with the systems approach which treated systems as being organised from the top down to that which now dominates where systems are treated as evolving from the bottom up. The switch in thinking we describe is best pictured in...
CASA Working Papers

What Are Leaders Really For?

December 9, 2011 Comments (0)

By refusing to name a leader, Occupy Wall Street presents a challenge to this view. With no one figure to credit or blame, with no face to put on a sprawling inchoate movement, and with no hierarchy of power, we simply don't know how to process what "it" is, and therefore how to think about it. And because this absence of a familiar personality-centric narrative makes us uncomfortable, we are...
HBR Blog Network

An Experimental Study of Homophily in the Adoption of Health Behavior

December 9, 2011 Comments (0)

How does the composition of a population affect the adoption of health behaviors and innovations? Homophily—similarity of social contacts—can increase dyadic-level influence, but it can also force less healthy individuals to interact primarily with one another, thereby excluding them from interactions with healthier, more influential, early adopters. As a result, an important network-level...

Luis von Ahn: Massive-scale online collaboration

December 9, 2011 Comments (0)

After re-purposing CAPTCHA so each human-typed response helps digitize books, Luis von Ahn wondered how else to use small contributions by many on the Internet for greater good. At TEDxCMU, he shares how his ambitious new project, Duolingo, will help millions learn a new language while translating the Web quickly and accurately -- all for...

Cheryl Hayashi: The magnificence of spider silk

December 9, 2011 Comments (0)

Cheryl Hayashi studies spider silk, one of nature's most high-performance materials. Each species of spider can make up to 7 very different kinds of silk. How do they do it? Hayashi explains at the DNA level -- then shows us how this super-strong, super-flexible material can...

How to Fix World Transportation

December 9, 2011 Comments (0)

Keeping people and goods moving safely and efficiently—whether by land, sea, or air—is one of the great challenges of the modern age. Complications include aging infrastructure, sprawling cities, shrinking budgets, and the predictable unpredictability of human behavior. To find out how to fix transportation for the 21st century (…) Norman Pearlstine gathered an all-star cast: [Dale Moser,...

Complexity in human transportation networks: a comparative analysis of worldwide air transportation and global cargo-ship movements

December 9, 2011 Comments (0)

We present a comparative network-theoretic analysis of the two largest global transportation networks: the worldwide air-transportation network (WAN) and the global cargo-ship network (GCSN). We show that both networks exhibit surprising statistical similarities despite significant differences in topology and connectivity. Both networks exhibit a discontinuity in node and link betweenness...
Eur. Phys. J. B

An Evolution Toward a Programmable Universe

December 9, 2011 Comments (0)

Such computational power, co-located with the gigantic storage that holds the data from all the incoming data streams, will enable faster-than-real-time simulations of many aspects of our physical world. As Mike Liebhold and his colleagues at the Institute for the Future have discussed, computing will have evolved from merely sensing local information to analyzing it to being able to control it....