To encounter the emergent necessity of radio spectrum, which is a limited natural resource, proper utilization of the radio spectrum is a must. Introduction of cognitive radio networks can play a vital role to solve the spectrum scarcity. Cognitive radio uses an open spectrum allocation technique to make more efficient utilization of the wireless radio spectrum and reduce the bottleneck on the ...

We study the role of visual reasoning as a computat iona l ly feasible heuristic too l in geometry prob lem solving. We use an algebraic nota t ion to represent geometric objects and to manipulate them. We show that this representation captures powerfu l heuristics for p rov ing geometry theorems, and that it allows a systematic manipu la t ion of geometric features in a manner similar to what ...