Complexes

Today I went to an Open Workshop of the EU-funded CREEN project (Critical Events in Evolving Networks). The members of the consortium are working on different models for network evolution, very interesting stuff. They have compiled a catalogue of critical events in complex networks , which gives a very nice and brief introduction to the main concepts relevant to this topic. They have produced several interesting papers, but some of them are still not online...

Marko and Jen are testing the possibility of using prediction markets as an alternative/complement of peer review. So, you can trade with my submitted papers... A General Methodology for Designing Self-Organizing Systems Towards Self-organizing Bureaucracies You can also add your papers under review, just go to http://cdms.inklingmarkets.com/

A couple of weeks ago I went to the lecture "Qu'es-ce que l'émergence?" by Hugues Bersini , as a part of the Seminar series " Penser La Science ", in honor of Ilya Prigogine . "Emergence" has been a widely used and abused term, with the drawback that there is no agreed definition of it. As Jack Cohen puts it: "Emergence is like pornography. I cannot define it, but I know when I see it." Well, we can say that emergent properties are those that are not present in the components of a system, but are a product of their interactions. Phil Anderson gives the nice example of gold: its atoms do not have temperature, malleability, conductivity, colour, etc. that a piece of the metal has. Thus these properties "emerge" from the interactions between atoms. Similarly, cells are made of non-living molecules, but their interactions generate properties that we call "living", so we can say that life is an emergent property. What Bersi...

I compiled a list of the websites that have changed the way information is produced, handled, or distributed over the Internet. Many of these sites have something in common: they enable users (human or software) to judge the relevance of their content, to provide "interesting" information to others. This has been called distributed cognition or collective intelligence: like diligent ants, the small contributions of many people or sites lead to great achievements and sources of information. Google . The most effective search engine for several years now. It judges the relevance of a webpage (its PageRank) by the PageRank of webpages that link to it. Thus, if many webpages link to a certain site, this should be interesting. And even more if those webpages are interesting themselves. Google has become an empire of free web-based utilities (in some cases buying other companies): GMail . One of the most flexible free web-based mail providers , it gives users almost 3Gb of disk sp...

You need a technological update if... you still connect to the Internet with gopher your mobile phone weights more than 200 grams, or you can't receive SMS you still use pine to check your e-mail and lynx to surf the web you still use floppy disks you still use vi to edit your code your monitor is monochromatic or CGI you don't use Google to search the web still have a hotmail account instead of a gmail account burning a CD takes you more than twenty minutes you still use Wordstar you still listen to tapes in your walkman you have never heard of Linux you prefer documents in ps over pdf your camera is not digital your are proud of your laserdisc collection you or your children play with Intellivision or Atari 2600 your company still praises COBOL you don't know what a blog is...

Our friends Chris and Antonja showed us Pandora . It is the outcome of the Music Genome Project , which started with the turn of the century. They have analyzed songs from more than ten thousand artists (and counting), and graded them according to different properties, such as melody, harmony and rhythm. Making their huge database available to the public, it enables the personalization of radio stations. For example, if you like Led Zeppelin (In this world, there are two kinds of people, those who like Led Zeppelin, and those who haven't heard them), you can easily create a "Led Zeppelin station". Unlike Radio Netscape, it doesn't play ONLY Led Zeppelin songs 24/7 (which is not bad...), but will randomly give you to listen songs from and similar to Led Zeppelin's, e.g. Jimi Hendrix, Black Sabbath, etc... This is great not only for listening music you like, but also to discover artists you never knew about... Pandora has more functionalities I will let the interes...

After two busy months, I have the first complete version of my thesis (I need to thank Nadia for her great patience!). Now it will be reviewed by the members of my thesis comission, and in a couple of months I would give the private defense... Let's hope that I'm not requested to change more than half of it! Please feel free to send in any comments. Design and Control of Self-organizing Systems PhD Dissertation presented by Carlos Gershenson (to be defended in 2007) Abstract Complex systems are difficult to design and control. There are several particular methods for coping with complexity, but there is no general methodology. In this thesis I propose such a methodology. This is based on the description of the system as self-organizing. The methodology proposes a series of steps to follow to find proper mechanisms that will promote elements to find solutions by actively interacting among themselves. A general introduction to complex thinking is given, since d...