dimitris kalamaras

math, social network analysis, web dev, free software…

COVID-19: The rules of contagion

In a NY Times interview, mathematician Adam Kucharski explained how a contagious disease like the Coronavirus Disease 2019 (aka COVID-19) is spread and which of the figures that keep popping up in coronavirus news we need to pay attention to.

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Great videos – Iron Maiden Live 1981

This awesomely remastered video of Iron Maiden performing live in Germany from early 1981 is just amazing. Shows the roots of the band and justifies Paul Di’Anno saying it was a metal punk band. And most songs sound even better than the studio versions. A truly brilliant performance of four gifted musicians and a great singer. Clive Burr on drums just rocks. Just listen his take on Phantom of the Opera.

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SocNetV v2.5 has been released!

The Social Network Visualizer project happily released today a brand new version of our favorite social network analysis and visualization tool. SocNetV version 2.5, codenamed “maniac”, brings new features and improvements (i.e. custom node icons) and it is as usually available for Windows, MacOS and Linux. Go to the project’s Downloads page and get it!

Drupal Theming: Boostrap Subtheme with Sass, Compass and Grunt

This article is a quick how-to create a Bootstrap subtheme for Drupal 7, as described here and here, to be able to work with the Sass CSS preprocessor. If you don’t know what Sass is and does, read this introductory guide.

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SocNetV version 2.4 released!

The Social Network Visualizer project has released a brand new version of our favorite social network analysis and visualization software application. SocNetV version 2.4, released on Feb 28, is a major upgrade bringing lots of new features, such as Kamada-Kawai FDP layout. The new version is available for Windows, Mac OS X and Linux as usual. Linux user may download a very light AppImage — just click it to run the app!

See a brief discussion of the new features and changes in version 2.4 at:
http://socnetv.org/news/?post=socnetv-24-released

Great Movies: District 9

District 9 is one of these movies that tell you a lot of real-world stories using exotic, if not superficially irrelevant, metaphors. In this case, the metaphor is simple: aliens have come to our planet, but without a clear purpose (peaceful or not). Rather, an alien mother-ship appeared over a South African city one day in 1982 and stayed there until the humans decided to enter and investigate what’s in there. What they found was thousands of alien insect-like beings without a leader, without food, without something to do or go. They looked… stranded thus the human government decided to confine them initially in a camp, called District 9, just outside the city…

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How to get free signed SSL Certificates and setup secure domains in Apache and Debian

This how-to describes the process to obtain 100% free, signed SSL Certificates from StartSSL.com and configure Apache in Debian to use these SSL certificates in your virtual domains, so that people can access your site(s) through https (i.e. https://example.com) without ever having the browser tell them the scary “this site isn’t trusted” anymore.

Before you start, you will need:

  • One or more of your functional domains which point to a server you own and have root access to. In this tutorial I’ll be using my wife’s supersyntages.gr as testbed.
  • A browser, for this tutorial Chrome, although you might prefer Firefox (see below why).
  • Root access to your server with Debian and Apache installed, with the above domains configured as VirtualHost.
  • The openssl package installed in your computer.
  • One of the following emails configured in each of the domains you want to include in the SSL certificates:
    [email protected]
    [email protected]
    [email protected]

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