Archivio per 15 maggio 2015

15
Mag
15

Optimal Census by Quorum Sensing

See on Scoop.itBounded Rationality and Beyond

Author Summary Bacteria regulate gene expression in response to changes in cell density in a process called quorum sensing. To synchronize their gene-expression programs, these bacteria need to glean as much information as possible about their cell density. Our study is the first to physically model the flow of information in a quorum-sensing microbial community, wherein the internal regulator of the individuals response tracks the external cell density via an endogenously generated shared signal. Combining information theory and Lagrangian formalism, we find that quorum-sensing systems can improve their information capabilities by tuning circuit feedbacks. Our analysis suggests that achieving information benefit via feedback requires dedicated systems to control gene expression noise, such as sRNA-based regulation.

See on journals.plos.org

Annunci
15
Mag
15

oftwominds-Charles Hugh Smith: When Europe Gets Greece’s Jingle Mail: Dealing with Default

See on Scoop.itGold and What Moves it.

The costs and consequences of Greece exiting the Eurozone may well dwarf the financial losses triggered by Greece’s default.

The term Jingle mail originated in the great popping of the housing bubble 2008-2011. It refers to defaulting homeowners mailing the keys to their house back to the lender, and it denotes the finality of default: it’s over.
The dream of ownership and easy wealth leveraged by vast debt: over. The dream that loans to marginal borrowers were as good as loans issued to qualified buyers: over.

And most importantly, the lender’s dream that marginal borrowers could somehow make the payments if the terms were tweaked is also over.

Which brings us to the jingle mail Greece is about to send Europe.Greece is analogous to the marginal home buyer who took on way more debt than the household could afford. Europe is analogous to the lender, who faces a spectrum of unsavory options:
1. Accept the reality of default, write off the loans and accept the horrendous losses.

Hal’s insight:

Click through for the rest.

See on charleshughsmith.blogspot.com

15
Mag
15

The Intrafirm Complexity of Systemically Important Financial Institutions

See on Scoop.itPapers

In November, 2011, the Financial Stability Board, in collaboration with the International Monetary Fund, published a list of 29 “systemically important financial institutions” (SIFIs). This designation reflects a concern that the failure of any one of them could have dramatic negative consequences for the global economy and is based on “their size, complexity, and systemic interconnectedness”. While the characteristics of “size” and “systemic interconnectedness” have been the subject of a good deal of quantitative analysis, less attention has been paid to measures of a firm’s “complexity.” In this paper we take on the challenges of measuring the complexity of a financial institution and to that end explore the use of the structure of an individual firm’s control hierarchy as a proxy for institutional complexity. The control hierarchy is a network representation of the institution and its subsidiaries. We show that this mathematical representation (and various associated metrics) provides a consistent way to compare the complexity of firms with often very disparate business models and as such may provide the foundation for determining a SIFI designation. By quantifying the level of complexity of a firm, our approach also may prove useful should firms need to reduce their level of complexity either in response to business or regulatory needs. Using a data set containing the control hierarchies of many of the designated SIFIs, we find that in the past two years, these firms have decreased their level of complexity, perhaps in response to regulatory requirements.

The Intrafirm Complexity of Systemically Important Financial Institutions
Robin L. Lumsdaine, Daniel N. Rockmore, Nicholas Foti, Gregory Leibon, J. Doyne Farmer

http://arxiv.org/abs/1505.02305

See on arxiv.org

15
Mag
15

Googling Gives Illusion of Knowledge Even When The Search Reveals Nothing! – PsyBlog

See on Scoop.itBounded Rationality and Beyond

Even when an internet search is unsuccessful, people feel they know more.

 

Searching the internet makes people feel they know more than they really do, a new study finds.

And it doesn’t seem to matter much that people don’t actually find the information for which they were searching.

 
See on spring.org.uk




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