The challenges for motif extraction problem are two-fold: one is to design an efficient algorithm to enumerate the frequent motifs; the other is to statistically validate the extracted motifs and report the significant ones.
Moreover, previous applications in solving signal extraction problems were taken into account when selecting models in this study.
Another problem is extraction of accurate three-dimensional information from two-dimensional images which calls for formulation of hypotheses for the third dimension of fragments [5].
A key problem is the extraction of maximum exergy from a hot gaseous stream that is gradually cooled and eventually discharged into the ambient.
Depending on whether it was just a fluke occurrence or a sign that the constitution of the oil sands it processes is changing, the company could either retool its extraction process or, if the problem is a short-term one, blend the rich ore with more normal inputs.
Preparatory to the visualization, the main interaction problem is in the extraction of the useful portion of information from massive volumes.
The problem is the organized, illicit extraction of natural resources".
The problem is that property development has become an extraction industry – asset-stripping, to profit from poverty".
"The problem is that every additional square metre means additional water extraction from the ground, additional electricity.
