Archivio per 13 febbraio 2015

13
Feb
15

Ebola Epidemic Should End In May, Say Disease Modellers

See on Scoop.itSocial Foraging

On 17 March 2014, doctors diagnosed a single case of Ebola in the county of Lofa in Liberia, West Africa. This was the first, patient zero, in an epidemic that has so far infected more than 20,000 people and killed almost 8000.

On 15 August, the World Health Organisation and other bodies began a major drive in Liberia to halt the epidemic. The strategy has two parts. The first aims to limit the spread of the disease from people who have been infected by ensuring that everyone with symptoms goes to an official treatment centre.

The second is to prevent the spread of the disease after death by ensuring that every Ebola victim is buried in a way that prevents further infection. That means wearing protective clothing to place the body in a body bag and then in a coffin before transporting it to a grave. Finally, the aid workers must disinfect the victim’s home and ensure appropriate washing for all those involved in the disposal of the body.

See on technologyreview.com

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13
Feb
15

The price of gold is taking a beating

See on Scoop.itGold and What Moves it.

Gold’s 2015 rally was looking shaky on Wednesday with the metal falling for a second day in a row to levels last seen January 9.

The decline in the gold price came despite rising concerns that Greece may abandon the euro and Ukraine may be headed for a wider conflict with the stronger US dollar doing most of the damage.

In afternoon trade on the Comex division of the New York Mercantile Exchange gold for April delivery dropped 1.1% or $13.60 to exchange hands at $1,218.60 an ounce, at the lows for the day.

See on mining.com

13
Feb
15

Nonlinear Dynamics of the Rock-Paper-Scissors Game with Mutations

See on Scoop.itPapers

We analyze the replicator-mutator equations for the Rock-Paper-Scissors game. Various graph-theoretic patterns of mutation are considered, ranging from a single unidirectional mutation pathway between two of the species, to global bidirectional mutation among all the species. Our main result is that the coexistence state, in which all three species exist in equilibrium, can be destabilized by arbitrarily small mutation rates. After it loses stability, the coexistence state gives birth to a stable limit cycle solution created in a supercritical Hopf bifurcation. This attracting periodic solution exists for all the mutation patterns considered, and persists arbitrarily close to the limit of zero mutation rate and a zero-sum game.

Nonlinear Dynamics of the Rock-Paper-Scissors Game with Mutations
Danielle F. P. Toupo, Steven H. Strogatz

http://arxiv.org/abs/1502.03370

See on arxiv.org

13
Feb
15

Psychologists Have Uncovered a Troubling Feature of People Who Seem Nice All the Time

See on Scoop.itBounded Rationality and Beyond

Being affable and pleasant can come with some serious drawbacks.

In 1961, curious about a person’s willingness to obey an authority figure, social psychologist Stanley Milgram began trials on his now-famous experiment. In it, he tested how far a subject would go electrically shocking a stranger (actually an actor faking the pain) simply because they were following orders. Some subjects, Milgram found, would follow directives until the person was dead.

The news: A new Milgram-like experiment published this month in the Journal of Personality has taken this idea to the next step by trying to understand which kinds of people are more or less willing to obey these kinds of orders. What researchers discovered was surprising: Those who are described as “agreeable, conscientious personalities” are more likely to follow orders and deliver electric shocks that they believe can harm innocent people, while “more contrarian, less agreeable personalities” are more likely to refuse to hurt others.

 
See on mic.com

13
Feb
15

big data challenge of the human brain

See on Scoop.itBounded Rationality and Beyond

In order to address the big data challenge of the human brain, researchers at the SPECS lab lead by Paul Verschure, have recently developed BrainX3, a platform for visualization, simulation, analysis and interaction of large data, that combines computational power with human intuition in representing and interacting with large complex networks. BrainX3 serves as a hypotheses generator of big data. As is often the case with complex data, one might not always have a specific hypothesis to start with. Instead, discovering meaningful patterns and associations in big data might be a necessary incubation step for formulating well-defined hypotheses.

On this platform, the researchers reconstructed a large-scale simulation of human brain activity in a 3D virtual reality environment. Using the brain’s known connectivity along with detailed biophysics, the researchers reconstruct neuronal activity of the entire cortex in the resting-state. Users can interact with BrainX3 in real-time by perturbing brain regions with transient stimulations to observe reverberating network activity, simulate lesion dynamics or implement network analysis functions from a library of graph theoretic measures. Within the immersive mixed/virtual reality space of BrainX3 users can explore and analysis dynamical activity patterns of brain networks, both at rest or during task, or for discovering of signaling pathways associated to brain function and/or dysfunction or as a tool for virtual neurosurgery.

 

See on ceeds-project.eu




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