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pierredv : information   12

Matter, energy… knowledge: How to harness physics' demonic power | New Scientist, May 2016
"Information is a real, physical thing that seems to play a part in everything from how machines work to how living creatures function.

Recently came the most startling demonstration yet: a tiny machine powered purely by information, which chilled metal through the power of its knowledge"

"Others realised that the demon’s trick depends on its knowledge of the molecules but Szilard’s breakthrough was to quantify the information the demon needed"

Landauer & Bennett: "Accounting for the cost of deleting information restored some balance to the demon’s thermodynamic world, but it was a little unsatisfactory. The demon still gets away with bending the second law for a while – until its head gets too full."

"Takahiro Sagawa and Masahito Ueda ... worked out that you can salvage the second law by adding an extra term called mutual information ... Sagawa and Ueda’s updated second law shows how much work you can extract from a system for a given amount of demonic knowledge. It doesn’t hold only when memory is erased."

"In 2010, Shoichi Toyabe then as at Chuo University in Tokyo and his colleagues built a working demon using a tiny plastic rotor, a camera and a computer. ... Jukka Pekola and his team at Aalto University in Espoo created a microscopic demon ... With no work being done, how can the system cool while the demon gets hotter? The feat seems impossible until we incorporate Sagawa and Ueda’s mutual information."

"If information alone can have a physical effect, then it is a physical thing. So what kind of thing is it? "

"Well, Pekola’s demon is not going to bring us perpetual motion. It is still governed by the restrictions Landauer hit upon: it can create a temperature difference that could be used to do work, but only at the cost of repeatedly wiping its memory, which requires work."
NewScientist  information  Maxwell-demons  thermodynamics  entropy 
10 weeks ago by pierredv
re:log - Besucherstromanalyse per re:publica W-LAN
via "re:log [] by German data designers OpenDataCity reveals the movements of about 6,700 different electronic devices during re:publica 2013, a prestigious European conference on the topic of Digital Society. A dynamic map of the conference location shows the approximate locations of the devices when they were connected to the local WiFi hotspots. An interactive timeline underneath allows to explore the dynamic changes over time, while a rectangular area can be drawn to more specifically highlight and follow a smaller amount of dots. The visualization was based on tracking the MAC addresses of the devices according to the WiFi hotspot they were connected to. This data, which can be downloaded, was fully anonymized, yet the authors mention their desire to allow people to look up their own MAC address in the future."
visualization  traffic  via  information  aesthetics  blob  mapping  Wi-Fi 
july 2013 by pierredv
Curation is the New Search is the New Curation
"It has turned search back into something like it was in the dying days of first-generation algorithmic search, like Excite and Altavista: results so polluted by spam that you often started looking at results only on the second or third page -- the first page was a smoking hulk of algo-optimized awfulness."
via:martinweiss  search  google  information 
february 2011 by pierredv
via New Scientist story by Paul Parsons, 16 Jan 2010
Abstract: Information hazards are risks that arise from the dissemination or the potential dissemination of true information that may cause harm or enable some agent to cause harm. Such hazards are often subtler than direct physical threats, and, as a consequence, are easily overlooked. They can, however, be important. This paper surveys the terrain and proposes a taxonomy.
risk  information  knowledge  PDF  filetype:pdf  media:document 
january 2010 by pierredv
The dangers of a high-information diet - New Scientist
15 January 2010 Built around work of Nick Bostrom "information hazards" "The question now rearing its head is whether we now know too much. Does the recent explosion in available information, primarily thanks to the internet (see graphs), bring dangers we have not anticipated?"
NewScientist  information  technology  trends 
january 2010 by pierredv

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