Dynamic traitor tracing schemes are used to trace the source of piracy in broadcast environments such as cable TV. Dynamic schemes divide content into a series of watermarked segments that are then broadcast. The broadcast provider can adapt the watermarks according to the pirate’s response and eventually trace him/her. As dynamic algorithms are deterministic, for a given set of inputs, the tra...

A variation of cone-tracing is used to predict the signal strength in wireless networks. Differences between light and radio waves necessitate certain changes to the basic ray/cone tracing algorithm, as does the information required of the solution. The new algorithm is compared to a previous algorithm for signal strength prediction, and verified on some examples.

Constructing noise maps for large areas is a tedious and CPU intensive task, even if engineering approximations to outdoor sound propagation models are introduced. This paper reports on an effort to optimize beam tracing in order to reduce the number of generated paths between source and observer, while still guaranteeing the required accuracy. Beam tracing is a ray based technique that groups ...