From this observation, it is clear that to make the value Θ, the difference in the average MSE between the unconstrained and constrained systems, become as positive as possible, the constrained selection method should result in the cost penalty Δ as small as possible.
Meanwhile, the authors in [13] considered linear optimization to devise their constrained selection scheme.
Some research works have studied the constrained selection approach in the literature, such as [11 13].
Based on their successful simulation with closely constrained selection of input parameters, they propose to use the model to produce quite realistic first-order predictions of run-out of potential slides and to outline potential hazard areas.
Because matrices of alpha and sigma parameters are calculated, the models do not constrain selection strength and the random drift disturbances to be isotropic in shape space.
However, pleiotropy may also constrain selection in the simultaneous or fluctuating presence of different antibiotics, or – in contrast – facilitate escape from epistatic constraints to adaptation in the presence of a single antibiotic (Goulart et al. 2013; Schenk and De Visser 2013).
Namely, the variable strength (and even sign) of the genetic correlations on different host varieties suggests that the trade-off constrains selection on some hosts, but not on others.
Conversely, traits such as fat thickness, docility, and heifer pregnancy rate have not been as intensely selected as growth traits, due to the differing breeding objectives of beef producers, genetic antagonisms constraining selection response, and the historic difficulty in collecting field data to allow the development of EPDs for these traits.
In [11, 12], allocation algorithms were developed to realize the constrained selection scheme.
To overcome these drawbacks, we have proposed an optimal constrained selection scheme that can equally allocate data subcarriers among transmit antennas by means of linear optimization.
Simulation results demonstrate that a significant improvement in terms of error performance could be achieved in the proposed system with a constrained selection compared to its counterpart.
