This paper introduces a niching technique called GAS which dynamically creates a subpopulation structure (taxonomic chart) using a radius function instead of a single radius, and a `cooling' method similar to simulated annealing. GAS offers a solution to the niche radius problem with the help of these techniques. A method based on the speed of species is presented for determining the radius function. Speed functions are given for both real and binary domains. Finally we discuss the sphere packing problem on binary domains using some tools of coding theory to make it possible to evaluate the output of the system.