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Ma Ru

IEEE Trans. Evolutionary Computation - Special Issue on Differential Evolution - 3 views

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    Dario - perhaps worth giving a look to be up-to-date... There's even an article "Improving Classical and Decentralized Differential Evolution with New Mutation Operator and Population Topologies". They quote our CEC paper, but not the ParCo.
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    Don't know if you have full text access, so here goes the quote: "Recently, Izzo et al. designed in [27] a heterogeneous asynchronous island model for DE. They considered five islands and five DE strategies (DE/best/1/exp, DE/rand/1/exp, DE/rand-to-best/1/exp, DE/best/2/exp, and DE/rand/2/exp), and studied five distributed DEs using the same DE strategy in all the islands, and a heterogeneous model with one different DE strategy in every island. As a result, the heterogeneous model is not outstanding, but performs as well as the others."
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    Isn't it a bit a paper-killing quote?
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    :) It's in the context of a review of the work that's been done about DE with island model in general, they don't evaluate. Pity they didn't refer to the ParCo article on topologies, as it was a bit more extensive and more focused on the method (as they do in the article) rather than on the problem (as was our CEC paper, if I recall well).
Joris _

Cosmic Log - Volunteers find another prize pulsar - 2 views

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    like the profiles ... "The clearest evidence for the pulsar's existence was provided by computers operated by two volunteers: Vitaly Shiryaev, a Russian researcher who has a Ph.D. in radio physics; and Stacey Eastham, who does vehicle testing for the British government in Darwen. In his profile, Eastham says he's studying astronomy and physics on the side. He got involved in the Einstein @ Home project because he's interested in "anything space-like, and being able to be part of something like this is right up my street."
LeopoldS

Ample Dark Matter Ignites Starburst Galaxies | Wired Science | Wired.com - 1 views

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    true?
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    I think what these studies show (assuming that data and analysis are correct) is the fact that there is something fundamentally wrong about all this dark matter, dark energy dark whatever stuff. From this point of view I would say: nice result, go ahead!!
Joris _

Tracking Whale Sharks With Astronomical Algorithms | Wired Science | Wired.com - 3 views

  • equations were developed for astronomers using the Hubble telescope, Holmberg’s crew adapted them for biologists studying Earth’s biggest fishes
  • Holmberg also hopes that other programmers will follow his lead and lend their coding skills to worthy projects. “Pick the species or concern you’re most passionate about, pick the researchers who are working on it, and identify their technical needs,” he said. “I’m not even a great programmer. I’m underqualified but highly productive
Luís F. Simões

Lonely Rogue Worlds Surprisingly Outnumber Alien Planets with Suns | Alien Planets & So... - 1 views

  • Astronomers have discovered a whole new class of alien planet: a vast population of Jupiter-mass worlds that float through space without any discernible host star, a new study finds.
  • Sumi and his team looked at two years' worth of data from a telescope in New Zealand, which was monitoring 50 million Milky Way stars for microlensing events. They identified 474 such events, including 10 that lasted less than two days. The short duration of these 10 events indicated that the foreground object in each case was not a star but a planet roughly the mass of Jupiter. And the signals from their parent stars were nowhere to be found.
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    here's something we didn't consider yesterday in the meeting on extra-solar planets!
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    this is because you did not read the nature paper I have posted (see post a few lines below ...)
Ma Ru

Ten Simple Rules for Providing a Scientific Web Resource - 0 views

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    May be an interesting reading for those who add auxiliary on-line materials to their publications. This reminds me... results of my topology study aren't on-line yet :-)
Luzi Bergamin

Prof. Markrams Hirnmaschine (Startseite, NZZ Online) - 2 views

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    A critical view on Prof. Markram's Blue Brain project (in German).
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    A critical view on Prof. Markram's Blue Brain project (in German).
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    so critical that the comment needed to be posted twice :-) ?
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    Yes, I know; I still don't know how to deal with this f.... Diigo Toolbar! Shame on me!!!
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    Would be nice to read something about the modelling, but it appears that there is nothing published in detail. Following the article, the main approach is to model each(!) neuron taking into account the spatial structure of the neurons positions. Once achieved they expect intelligent behaviour. And they need a (type of) supercomputer which does not exist yet.
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    As far as I know it's sort of like "Let's construct an enormous dynamical system and see what happens"... i.e. a waste of taxpayer's money... Able to heal Alzheimer... Yeah... Actually I was on the conference the author is mentioning (FET 2011) and I have seen the presentations of all 6 flagship proposals. Following that I had a discussion with one of my colleagues about the existence of limits of the amount of bullshit politicians are willing to buy from scientists. Will there be a point at which politicians, despite their total ignorance, will realise that scientists simply don't deliver anything they promise? How long will we (scientists) be stuck in the viscous circle of have-to-promise-more-than-predecessors in order to get money? Will we face a situation when we'll be forced to revert to promises which are realistic? To be honest none of the 6 presentations convinced me of their scientific merit (apart from the one on graphene where I have absolutely no expertise to tell). Apparently a huge amount of money is about to be wasted.
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    It's not just "Let's construct an enormous dynamical system and see what happens", it's worse! Also the simulation of the cosmological evolution is/was a little bit of this type, still the results are very interesting and useful. Why? Neither the whole cosmos nor the human brain at the level of single neurons can be modelled on a computer, that would last aeons on a "yet-to-be-invented-extra-super-computer". Thus one has to make assumptions and simplifications. In cosmology we have working theories of gravitation, thermodynamics, electrodynamics etc. at hand; starting from these theories we can make reasonable assumptions and (more or less) justified simplifications. The result is valuable since it provides insight into a complex system under given, explicit and understood assumptions. Nothing similar seems to exist in neuroscience. There is no theory of the human brain and apparently nobody has the slightest idea which simplifications can be made without harm. Of course, Mr. Markram remains completely unaffected of ''details'' like this. Finally, Marek, money is not wasted, we ''build networks of excellence'' and ''select the brightest of the brightest'' to make them study and work at our ''elite institutions'' :-). I lively remember the stage of one of these "bestofthebest" from Ivy League at the ACT...
Dario Izzo

Black Holes play drums - 8 views

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    Another great presentation at this conference!! Plus I always wanted to enter the numerical computations of orbit around black holes.... with Luzi we had a project on formation flying around black holes .... revolutionary idea (of course we did not do it!!!)
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    formation flying around black holes... so practical...
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    nice movie, and song :) we should definitely implement GR orbits in pagmo !
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    I agree Marek, yet was it practical for Apollonio to study conic sections more than 1500 years before Kepler found his three laws? And here is a good paper to start with: http://prd.aps.org/abstract/PRD/v77/i10/e103005, making an analogy between the periodic table and the taxomony of all orbits around a black hole.
santecarloni

Even Robots Can Be Heroes - ScienceNOW - 5 views

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    "Computer simulations of tiny robots with rudimentary nervous systems show that, over hundreds of generations, these virtual machines evolve altruistic behaviors"
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    I have lost track of all the artificial life/evolutionary computing studies showing the evolution of cooperation/altruism. I don't understand why all the big fuss about this latest one.
Luís F. Simões

New algorithm offers ability to influence systems such as living cells or social networks - 3 views

  • a new computational model that can analyze any type of complex network -- biological, social or electronic -- and reveal the critical points that can be used to control the entire system.
  • Slotine and his colleagues applied traditional control theory to these recent advances, devising a new model for controlling complex, self-assembling networks.
  • Yang-Yu Liu, Jean-Jacques Slotine, Albert-László Barabási. Controllability of complex networks. Nature, 2011; 473 (7346): 167 DOI: 10.1038/nature10011
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    Sounds too super to be true, no?
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    cover story in the May 12 issue of Nature
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    For each, they calculated the percentage of points that need to be controlled in order to gain control of the entire system.
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    > Sounds too super to be true, no? Yeah, how else may it sound, being a combination of hi-quality (I assume) research targeted at attracting funding, raised to the power of Science Daily's pop-pseudo-scientific journalists' bu****it? Original article starts with a cool sentence too: > The ultimate proof of our understanding of natural or technological systems is reflected in our ability to control them. ...a good starting point for a never-ending philosophers' debate... Now seriously, because of a big name behind the study, I'm very curious to read the original article. Although I expect the conclusion to be that in practical cases (i.e. the cases of "networks" you *would like to* "control"), you need to control all nodes or something equally impractical...
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    then I am looking forward to reading your conclusions here after you will have actually read the paper
LeopoldS

Tree identification a snap with mobile app - Technology & Science - CBC News - 1 views

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    One more nice citizen scientist example as I try to find for space since some time. Any good ideas this mit inspire you to?
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    IF THERE IS A MUSHROOM IDENTIFICATION APP I BUY AN IPHONE IMMEDIATELY!!!
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    why don't you programme one and get rich?
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    Would love to but this requires *TIME* :-( Automatic image-based mushroom recognition... perhaps could do as a FP7 study... it may save lives actually!
Francesco Biscani

iTWire - London Stock Exchange gets the facts and dumps Windows for Linux - 1 views

  • Microsoft’s marketing arm excitedly churned out a case study in 2005 when the London Stock Exchange (LSE) rolled out a C# stock exchange ticker system on Windows Server 2003 and SQL Server 2000. Four years later the LSE has scrapped the whole system in favour of a Linux-based solution instead.
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    Microsoft "Gets the facts".
Juxi Leitner

Cockroach-Inspired Robot Survives 8-Story Fall, Will Outlive Us All - Dash - Gizmodo - 3 views

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    wow ... nice project ... and very simple indeed!
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    sweet! That's a convincing biomimetic study :) Especially when it falls and survives...
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    nice and good work, as usual from this lab. however, biomimetic is only the name, as usual from this lab.
Joris _

The Space Review: Breaking up may be good to do - 6 views

shared by Joris _ on 03 Nov 09 - Cached
LeopoldS liked it
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    I especially like " The program will also create a "developer's kit" of open hardware and software specifications to make it easier for new components to integrate into such fractionated systems." Joris: wanna take the lead on having a closer look on this, I definitely would like to be part of it and happy to contribute, possibly also Juxi? - first assessment by Christmas realistic?
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    I think it a very interesting approach. If you google "darpa F6", you should see that a lot seems to be on-going. So, should we do something about it before having the conclusions of the Darpa study ?
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    wait and see is never a good approach in these cases .... first step has to be anyway to understand what they are up to and then to think about our own ideas on it, own approaches, alternatives and then to see what we can do specifically in the team on it.
Friederike Sontag

AMS Policy Statement on Geoengineering the Climate System - 0 views

  • Therefore, the American Meteorological Society recommends:
  • Enhanced research on the scientific and technological potential for geoengineering
  • the climate system, including research on intended and unintended environmental responses.
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  • Coordinated study of historical, ethical, legal, and social implications of geoengineering
  • that integrates international, interdisciplinary, and intergenerational issues and perspectives and includes lessons from past efforts to modify weather and climate. Development and analysis of policy options to promote transparency and international cooperation in exploring geoengineering options along with restrictions on reckless efforts to manipulate the climate system.
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    policy statement regarding research on geoengineerin in the US (in force from July 2009-July 2012)
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    looking forward to your recommendations how we can get into it quickly :-)
pacome delva

Divided Brains Are Smarter -- ScienceNOW - 0 views

  • "The idea of a link between lateralization strength and cognitive abilities has been around ... for many years, but little comparative and experimental work has been done with animals." This study, he says, provides "fascinating confirmation of the link between higher cognition and brain asymmetry."
Joris _

Animal personalities: Unnatural selection | The Economist - 0 views

  • the first time that differences in personality have been shown in wild birds
  • hese analyses are based on the assumption that the animals collected represent a randomly selected and thus representative sample of the population.
  • Instead it looks as if such trapping studies are selecting the bravest individuals.
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    What if heuristic algorithms (PSO, DE, ...) do not actually simulate flocking birds or school gish beahviour ?!
nikolas smyrlakis

Complex network study of Brazilian soccer players - 0 views

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    looking a bit back to small world nets bibliography I bumped into that. quote: The probability that a Brazilian soccer player has worked at $N$ clubs or played $M$ games shows an exponential decay while the probability that he has scored $G$ goals is power law. (!)
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