This phase problem
approach seems to me to have promise, using nanofabrication techniques to create cellular optical device encryption surfaces (or CODES) on the surface of banknotes in order to generate unique optical features which are very difficult to invert or counterfeit--in other words a secure easily recognizable physical one-way function.
The period of the interfering signal that is causing the phase problem
can be calculated from this display.
If one could minimize the value of this complicated expression containing thousands of variables, one could solve the phase problem
In this study, a problem is considered to be a transfer problem if the solution of the problem uses the application of previous knowledge to solve a problem in a new situation, the validators classified them as transfer problems and the items are not similar to the acquisition and evaluation phase problems
and the nature of a proper sound-stage presentation are only part of the ongoing debate about microphones and their placement for two-channel recordings.
Done with skill, multi-microphone use can greatly reduce the kinds of phase problems
disliked by the coincident-source proponents, while still allowing the kind of control over the resulting sound mix that some recording engineers can feel comfortable with -- particularly if they have to re-master later on for a DVD-audio version.