group

Jarvis’ March

In computational geometry, Jarvis’ march or gift wrapping algorithm is used to compute the convex hull of a given set of points. The algorithm has broad range of applications in mathematics and computer science practically in pattern recognition, image processing, statistics, geographic information system (GIS) and game theory. Convex hull or convex envelope of a…

Z with LyX

Z (pronounced as zed) is a formal specification language used to describe and model complex computing system. I’ve been reading about it for some time and I am much fascinated by its abstraction and elegance. I’m really keen to practice Z but before I can adopt the notation in my work, I need to make sure…

DocBook XML on OSX

I have written some technical documentations using DocBook XML and then published them as HTML. You can find my previous post about DocBook Publishing and the technical documentations here. My site was hacked one or two years ago. The worst thing was that I did not have a backup copy of the HTML. The DocBook…

Android is a dirty phone

Android has been regarded as a savior to those who hate to be controlled and tied down by Apple’s strictly guarded iPhone. It is also one of the competitors closest to iPhone. While Apple’s latest iPhone 4 has a new feature called “FaceTime”, the Android on the other hand gets Sex. FaceTime is a feature…

iOS 4.0.1

Yesterday, Apple released iOS 4 update, which was one day before its press conference. The iOS 4.0.1 has obviously made the signal bar look taller. According to various media and blogs, the update is reportedly to have new software (new formula) to calculate the signal strength and to display it more accurately. Read here and…

Flash of the titans

Apple’s decision for not to implement Adobe’s Flash into iPhone OS has turned Adobe-Apple relationship sour. In an open letter from Steve Job, he has written clearly about Flash’s weaknesses and a firm stance against Adobe’s Flash. I absolutely agree with Steve based on my experience with Flash. I would say: “Flash is nice to…