I was interested in F# because of some of its fun usages, and the ease to do asynchronous and parallel computing. Used F# to implement some domain specific language like Turtle and fractal effect this afternoon. Basically the tasks themselves are nearly the same as this post and this post …
Just finished the final of convex optimization. This is really an interesting course, which even changed the way I'm looking at this world. In college, I was thinking in an algorithmic way, i.e., to solve a problem, will try to design some certain steps, following which we can get …
CAPTCHA is widely used to distinguish humans from robots, mainly preventing improper automations. However, sometimes we really need some automation which actually won't throw much burden to the server. An example is to check the status of an EMS (Express Mail Service, an "official" courier service provider hosted by China …
Made some trials to migrate this server to Linux recently. The main reasons are 1) The Ethernet adapter doesn't have proper driver for Windows Server 2008, but there are reports saying it'll work out of the box in Ubuntu 11.04+. (kind of weird) 2) Windows GUI is consuming …
(This post is translated from my blog post in Chinese)
What if collecting the mouse positions in one day, and plot it as a heat map? Following figure answers. Although it is only from about 3000 samples with 5 seconds per sample, it actually indicates something.
A highlight of this …