Year: 2012

Rijndael / AES (128 bit) in VB.net, PHP, Python
Being able to transport encrypted data is important in some of my projects at work. Oneway hashes using MD5 usually suffice for most encryption purposes but Symmetric Encryption algorithms are important for encrypting and then decrypting data. For this, we use the Rijndael and AES algorithm in a few different languages.

Removing the BuddyPress Admin Bar
A short script to remove that pesky BuddyPress Admin Bar in Wordpress 3.4.2 and BuddyPress 1.6.1

Cosine Similarity in MS SQL
Cosine similarity measures the angle between two vectors and can be used to perform similarity between text strings. In the following code, the two input strings are vectorized and the similarity is returned as a floating point value between 0 and 1.

Applications of Particle Swarm Optimization
Particle swarm optimization can be used in a variety of different applications. A few examples involving nonconvex, multiobjective, discontinuous search spaces and applications in neural networks and support vector machines are mentioned.

Indepth details of Particle Swarm Optimization
I explain and show code to construct the Particle Swarm Optimization in Python. I conclude by optimizing on the Rastrigin function, a function that researchers use to test optimization algorithms on.

An Overview of Particle Swarm Optimization
Particle swarm optimization is often used to optimize functions in rather unfriendly nonconvex, noncontinuous spaces. The idea behind the algorithm involves a swarm of particles flying through a space both collaboratively and independently.