« Extern editor i Movable Type | Main | Kroppsspråk och kulturell rymd »
augusti 17, 2003
Complexity Digest
Den senaste Complexity Digest innehåller bland annat följande:
- Punctuated Equilibrium in Software Evolution: The approach based on paradigm of self-organized criticality proposed for experimental investigation and theoretical modelling of software evolution. The dynamics of modifications studied for three free, open source programs Mozilla, Free-BSD and Emacs using the data from version control systems. Scaling laws typical for the self-organization criticality found. The model of software evolution presenting the natural selection principle is proposed. The results of numerical and analytical investigation of the model are presented. They are in a good agreement with the data collected for the real-world software.
- Signatures of small-world and scale-free properties in large computer programs: A large computer program is typically divided into many hundreds or even thousands of smaller units, whose logical connections define a network in a natural way. This network reflects the internal structure of the program, and defines the ``information flow'' within the program. We show that, (1) due to its growth in time this network displays a scale-free feature in that the probability of the number of links at a node obeys a power-law distribution, and (2) as a result of performance optimization of the program the network has a small-world structure. We believe that these features are generic for large computer programs. Our work extends the previous studies on growing networks, which have mostly been for physical networks, to the domain of computer software.
- Much ado about data: New computer analyses can identify Shakespeare as well as cardiac problems
- Purdue Scientists Discover Why We're All Lefties Deep Down: - It may be a right-handed world, but recent Purdue University research indicates that the first building blocks of life were lefties - and suggests why, on a molecular level, all living things remain southpaws to this day.
Posted by hakank at augusti 17, 2003 01:36 EM Posted to Komplexitet/emergens