Eikonal Blog


Schneier’s taxonomy of data used in social networks

Filed under: FaceBook, infosec, privacy — Tags: , — sandokan65 @ 14:34
  • “A Taxonomy of Social Networking Data” by Bruce Schneier (IEEE Security & Privacy; July/August 2010) – http://www.schneier.com/essay-322.html

    • Service data is the data you give to a social networking site in order to use it. Such data might include your legal name, your age, and your credit-card number.
    • Disclosed data is what you post on your own pages: blog entries, photographs, messages, comments, and so on.
    • Entrusted data is what you post on other people’s pages. It’s basically the same stuff as disclosed data, but the difference is that you don’t have control over the data once you post it — another user does.
    • Incidental data is what other people post about you: a paragraph about you that someone else writes, a picture of you that someone else takes and posts. Again, it’s basically the same stuff as disclosed data, but the difference is that you don’t have control over it, and you didn’t create it in the first place.
    • Behavioral data is data the site collects about your habits by recording what you do and who you do it with. It might include games you play, topics you write about, news articles you access (and what that says about your political leanings), and so on.
    • Derived data is data about you that is derived from all the other data. For example, if 80 percent of your friends self-identify as gay, you’re likely gay yourself.

Skype protocol(s?) cracked

Filed under: crypto, infosec — Tags: — sandokan65 @ 13:43


Uses of Eikonal approximation

Filed under: eikonal approximation, mathematics, physics — Tags: — sandokan65 @ 14:41
  • “Rytov/Eikonal Approximation of Wavepaths” by William S. Harlan (1998.04) – http://billharlan.com/pub/papers/rytov/rytov.html
  • “Structure of entropy solutions to the eikonal equation” by Camillo De Lellis and Felix Otto (Journal: J. Eur. Math. Soc.; Volume: 5; Number: 2; Pages: 107-145; 2003) – http://cvgmt.sns.it/papers/delott02/
      Abstract: In this paper, we establish rectifiability of the jump set of an S1-valued conservation law in two space-dimensions. This conservation law is a reformulation of the eikonal equation and is motivated by the singular limit of a class of variational problems. The only assumption on the weak solutions is that the entropy productions are (signed) Radon measures, an assumption which is justified by the variational origin. The methods are a combination of Geometric Measure Theory and elementary geometric arguments used to classify blow-ups.
      The merit of our approach is that we obtain the structure as if the solutions were in BV, without using the BV-control, which is not available in these variationally motivated problems.

Network protocols stacks

Filed under: networking — sandokan65 @ 14:31


Filed under: society — Tags: — sandokan65 @ 13:01



Filed under: genetics, health, life — Tags: — sandokan65 @ 12:23

Personality, whats that?


Virtualization security

Filed under: virtualization — Tags: , , , , — sandokan65 @ 12:04

Related here: Virtualization Tools – https://eikonal.wordpress.com/2010/12/02/virtualization-tools/ | Cloud security – https://eikonal.wordpress.com/2010/08/09/cloud-security/.

Cloud security

Filed under: infosec — Tags: , , , , , — sandokan65 @ 09:38

Related here: Cloud computing – https://eikonal.wordpress.com/2011/04/25/cloud-computing/ | Virtualization Tools – https://eikonal.wordpress.com/2010/12/02/virtualization-tools/ | Virtualization security – https://eikonal.wordpress.com/2010/08/09/virtualization-security/ | Threats of cloud computing – https://eikonal.wordpress.com/2010/02/03/threats-of-cloud-computing/.



Filed under: ai — Tags: , , — sandokan65 @ 22:06

Google as AI

    • “Watson was right” by Dace Aitel (DailyDave mail list; 2011.04.18)

      "I think there is a world market for maybe five computers." Watson may never have really said it, but it's currently right. 
      (c.f. http://www.perturb.org/images/1/dilbert-unix.png )
      Here's the thing: If you're at Google, and you compile Hello World, it tells you that it takes about 80 cores. We're at the 
      point where we need to define what a real computer is and what it can do in terms that makes what everyone has on 
      their desk obsolete, if we want to solve real problems. The brain shift that happens when you do this is interesting - when 
      you say "I have a problem that is parallel" and your solution is to run it all at once, without even thinking about how many 
      cores it took. When for all parallel problems, O(n) == O(1) in your head, then you've made the shift.
      Steve Yegge has some notes on what makes a real system, but the only one I like to steal is this: Computers don't reboot. 
      If you can reboot it, it's a calculator.
      Likewise, computers don't fit in a data center. And computers are general purpose.
      Google's can drive a car. If your computer can't drive a car down I-95, then it's not a computer.
      I mean, if you haven't read it, you should read it now:
      But the simple thing is this: Google has a computer, Microsoft may have a computer, the NSA most likely does, Baidu might 
      have one, Amazon probably has one. That's five.
      And if you don't even have a computer, how are you going to win a cyber-war?
  • “the Google at Delphi” by Todd Stumpf (Stevey’s Drunken Blog Rants; 2004.12.31) – http://sites.google.com/site/steveyegge2/google-at-delphi
  • Google as Artificial Intelligence (2004) – http://indi.ca/2004/05/google-becomes-conscious-google-as-artificial-intelligence/
  • Publications by Googlers – http://research.google.com/pubs/papers.html


Linguistics links


Language universals

  • “Are languages shaped by culture or cognition? – Linguists debate whether languages share universal grammatical features.” by Philip Ball (Nature; 2011.04.13) http://www.nature.com/news/2011/110413/full/news.2011.231.html
      They found that neither of the universalist models matched the evidence. Not only did the co-dependencies that they discovered differ from those predicted by Greenberg’s word-order ‘universals’, but they were different for each family. In other words, the deep grammatical structure of every family is different from that of the others: each family has evolved its own rules, so there is no reason to suppose that they are governed by universal cognitive factors.

      What’s more, even when a particular co-dependency of traits was shared by two families, the researchers could show that it came about in different ways for each, so it was possible that the commonality was coincidental. They conclude that the languages — at least in their word-order grammar — have been shaped in culture-specific ways rather than by universals.

  • “Universal truths” (Nature [Volume 472; Page 136]; 2011.04.14) – http://www.nature.com/nature/journal/v472/n7342/full/472136a.htmlRejection of broad commonality in structure of languages has implications for all sciences.
  • “Evolved structure of language shows lineage-specific trends in word-order universals” by Michael Dunn, Simon J. Greenhill, Stephen C. Levinson, Russell D. Gray (Nature [Volume 473; Pages 79–82]; 2011.05.05) – http://www.nature.com/nature/journal/v473/n7345/full/nature09923.html [FOR PAY ARTICLE]

Language myths

Related here: Language evolution and families – https://eikonal.wordpress.com/2010/12/16/language-families/ | Learning languages / Language acquisition – https://eikonal.wordpress.com/2010/11/12/learning-languages-language-acquisition/ | Bilingualism – https://eikonal.wordpress.com/2010/11/12/bilingualism-multilingualism/ | Language acquisition – https://eikonal.wordpress.com/2010/11/12/learning-languages-language-acquisition/ | Body language – https://eikonal.wordpress.com/2010/10/19/it-journals/.

Samba/SMB/CIFS security links

Filed under: infosec, unix, windows — Tags: , , — sandokan65 @ 13:04


Climate change – or not

  • “Paleoclimate Implications for Human-Made Climate Change” by James E. Hansen and Makiko Sato (arXiv:1105.0968v1 [physics.ao-ph]; 2011.05.05) – http://arxiv.org/abs/1105.0968
      Abstract: Milankovic climate oscillations help define climate sensitivity and assess potential human-made climate effects. We conclude that Earth in the warmest interglacial periods was less than 1{\deg}C warmer than in the Holocene. Goals to limit human-made warming to 2{\deg}C and CO2 to 450 ppm are not sufficient — they are prescriptions for disaster. Polar warmth in prior interglacials and the Pliocene does not imply that a significant cushion remains between today’s climate and dangerous warming, but rather that Earth today is poised to experience strong amplifying polar feedbacks in response to moderate additional warming. Deglaciation, disintegration of ice sheets, is nonlinear, spurred by amplifying feedbacks. If warming reaches a level that forces deglaciation, the rate of sea level rise will depend on the doubling time for ice sheet mass loss. Satellite gravity data, though too brief to be conclusive, are consistent with a doubling time of 10 years or less, implying the possibility of multi-meter sea level rise this century. The emerging shift to accelerating ice sheet mass loss supports our conclusion that Earth’s temperature has returned to at least the Holocene maximum. Rapid reduction of fossil fuel emissions is required for humanity to succeed in preserving a planet resembling the one on which civilization developed.
  • “Critics’ review unexpectedly supports scientific consensus on global warming” by Margot Roosevelt (Los Angeles Times; 2011.04.04) – http://www.latimes.com/news/local/la-me-climate-berkeley-20110404,0,772697.story
      A UC Berkeley team’s preliminary findings in a review of temperature data confirm global warming studies.
  • “The Truth, Still Inconvenient” by Paul Krugman (New York Times; 2011.04.03) – http://www.nytimes.com/2011/04/04/opinion/04krugman.html
      Prof. Richard Muller of Berkeley, a physicist who has gotten into the climate skeptic game, has been leading the Berkeley Earth Surface Temperature project, an effort partially financed by none other than the Koch foundation. And climate deniers — who claim that researchers at NASA and other groups analyzing climate trends have massaged and distorted the data — had been hoping that the Berkeley project would conclude that global warming is a myth.

      Instead, however, Professor Muller reported that his group’s preliminary results find a global warming trend “very similar to that reported by the prior groups.”

      Just a few weeks ago Anthony Watts, who runs a prominent climate denialist Web site, praised the Berkeley project and piously declared himself “prepared to accept whatever result they produce, even if it proves my premise wrong.” But never mind: once he knew that Professor Muller was going to present those preliminary results, Mr. Watts dismissed the hearing as “post normal science political theater.” And one of the regular contributors on his site dismissed Professor Muller as “a man driven by a very serious agenda.”
  • Berkeley Earth Surface Temperature project – http://www.berkeleyearth.org/
  • “Climate Change” (at “Darryl Cunningham Investigates” blog; 2010.12.13) – http://darryl-cunningham.blogspot.com/2010/12/climate-change.html
  • “The New North” (Seed; 2010.10.26) – http://seedmagazine.com/content/article/the_new_north/
  • “A Changed Climate Skeptic?” (an interview by Elizabeth Dickinson; Foreign Policy 2010.09.03) – http://www.foreignpolicy.com/articles/2010/09/03/interview_bjorn_lomborg: Bjorn Lomborg has long infuriated environmental activists with his contrarian views on global warming. Has he now embraced their cause?
  • “Scientists See Links From Asian Floods to Russian Heat” (New York Times; 2010.08.10) – http://dotearth.blogs.nytimes.com/2010/08/10/scientists-see-links-from-asian-floods-to-russian-heat/
    • “Climate change: how to play our hand?” (Guardian; 2010.08.09) – http://www.guardian.co.uk/environment/2010/aug/09/climate-change-flooding… There have always been extremes of weather around the world but evidence suggests human influence is changing the odds …
    • “Human contribution to the European heatwave of 2003” by Peter A. Stott, D. A. Stone & M. R. Allen (Letters to Nature; Nature 432, 610-614 (2 December 2004) | doi:10.1038/nature03089; Received 21 May 2004; Accepted 5 October 2004) – http://www.nature.com/nature/journal/v432/n7017/abs/nature03089.html
        Abstract: The summer of 2003 was probably the hottest in Europe since at latest ad 15001, 2, 3, 4, and unusually large numbers of heat-related deaths were reported in France, Germany and Italy5. It is an ill-posed question whether the 2003 heatwave was caused, in a simple deterministic sense, by a modification of the external influences on climate—for example, increasing concentrations of greenhouse gases in the atmosphere—because almost any such weather event might have occurred by chance in an unmodified climate. However, it is possible to estimate by how much human activities may have increased the risk of the occurrence of such a heatwave6, 7, 8. Here we use this conceptual framework to estimate the contribution of human-induced increases in atmospheric concentrations of greenhouse gases and other pollutants to the risk of the occurrence of unusually high mean summer temperatures throughout a large region of continental Europe. Using a threshold for mean summer temperature that was exceeded in 2003, but in no other year since the start of the instrumental record in 1851, we estimate it is very likely (confidence level >90%)9 that human influence has at least doubled the risk of a heatwave exceeding this threshold magnitude.
    • “Russian Heat, Asian Floods May Be Linked” by Brandon (Wired; 2010.08.10) – http://www.wired.com/wiredscience/2010/08/russian-heat-asian-floods/
  • “Climate Change – Uninhabitable Earth in 300 Years!” – http://northwardho.blogspot.com/2010/05/climate-change-uninhabitable-earth-in.html
  • “Climate change could spur mass migration of billions to polar cities in north and south by 2080 A.D.” (2010.07.30) – http://northwardho.blogspot.com/2010/07/climate-change-could-spur-mass.html
  • “The Heat Wave and the Climate Divide” by John Collins Rudolf (New York Times; 2010.07.09) – http://green.blogs.nytimes.com/2010/07/09/the-heat-wave-and-the-climate-divide/

Wet-Bulb temperature

Younger Dryas and temporary reversal of deglaciation around northern Atlantic arround 11000BE



Filed under: society — Tags: , , , , , , — sandokan65 @ 13:46

Calculating e

Filed under: mathematics — Tags: , — sandokan65 @ 09:48

Related at this blog: Pi calculations – https://eikonal.wordpress.com/2010/01/05/pi-calculations/



Filed under: knowledgeManagement, skills — Tags: , , , — sandokan65 @ 09:53

General information

GTD Blogs

GTD tools

GTD for BlackBerry

Related at this blog: Skills – https://eikonal.wordpress.com/2010/09/09/skils/.


Airplane fees

Filed under: travel — sandokan65 @ 13:19



Filed under: scripting, windows — Tags: , , , , , — sandokan65 @ 14:32

Portable Powershell:

Archiving and compression tools

Filed under: tools — Tags: , , , , — sandokan65 @ 10:24

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