The concepts for the long-term layer are found by the procedure shown in Figure 10. Figure 10 Long-term layer creation procedure.
Again m concepts with the highest persistency factor PF (with α = 0.1) are chosen to be the long-term layer.
And finally, the long-term layer is formed from n most frequent concepts which have also been observed in the short-term layer.
And finally, the long-term layer is derived from the most frequent concepts of the short-term layer, as discussed in the profile construction section, and reflects general user context of interaction with the system.
As it can be seen from the figures and their explanations, the constructed layers meet our expectations and requirements to reflect a user's current interests for the session profile layer, to be a representation of both recent and frequent interests (i.e., the recent and vivid interests lasting for some time) for the short-term layer, and to collect persistent interests for the long-term layer.
In other words, if we choose three concepts with the highest PF to be the long-term layer's concepts, the layer remains the same from the formation time (after item 217 is processed) - Pr a (ln) = {C6, C7, C4}.
Since the session profile layer is simple - consisting of one currently used concept - and very frequently changed with the change of the user's current interests and needs, we skip it to illustrate the dynamics of short-term and long-term layers.
Previous studies have shown that motor skill learning enhances synaptic strength and partially occludes long term potentiation (LTP) in layer II/III and layer I of the M1 forelimb area [24], [25] suggesting that LTP strengthens synapses during motor skill learning.
Furthermore, addition of fillers to adhesive resin could increase mechanical properties and decrease long term degradation of hybrid layer.
To test the transport of newly developed drugs through an epithelial cell layer long term gradient perfusion culture experiments were performed[99, 100].
After long term oxidation, the DB layer permits to reduce the Al depletion in the coating and to delay the phase transformations in the coating.
