We defined "attribute energy" in the form of frequency character to indicate surface status.
Two ventilation noises were used, one of a predominantly mid frequency character and the other of a predominantly low frequency character.
Two ventilation noises at the same A-weighted sound pressure level of 45 dB were used: one of a low-frequency character and one of a flat frequency character (reference noise).
Based on the concept of dynamic frequency character, the phase and amplitude conditions for wind farms to produce the positive damping effects on their connected power systems are proved in [43], and a damping control strategy of DFIG is studied on 2-area and multi-area power systems by means of Power System Analysis Software Package (PSASP).
Cross correlation comparisons between time series with widely divergent high frequency character (i.e. different levels of independence of errors) can lead to spurious inferences simply because the errors may not be independent [48].
It follows that the results must be viewed with caution as the low amplitude, low frequency character of the T wave involved a higher risk of error.
Both keyboards tend to place high-frequency characters in the first two quadrants (top-left and top-right quadrants).
For a low acceptable error rate, the high-frequency characters are placed a bit down the cursor path so that they have a low probability of an entry error and low-frequency characters are placed at the beginning of the cursor path.
In traditional 3-D CT reconstruction methods, for the projection procedure is low-pass smoothing, the high-frequency characters are difficult to obtain after the projection data are reconstructed.
For a higher acceptable error rate, the high-frequency characters are placed at the beginning of the cursor path, where the keys have the highest predicted entry error probability and are reached most quickly.
High-frequency characters ("s", "o", "e", "a", and "t") tend not to be placed on those error-prone locations and instead are shifted to later rows and columns that have a lower probability of error.
