As the number of 3-D association events increases dramatically [15] even given small number of measurements, targets and illuminators, it is computationally unrealistic to directly implement conventional 2-D data association approaches to resolve the 3-D data association problem in this passive radar system.
Meanwhile, legislators are prone to creating policies for political contingency that are often unrealistic and difficult to implement.
This appears unrealistic and extremely difficult to implement politically.
Some believe that results counterbalancing the detection rate for clinically important IFs, believed to be 2% to 8% [ 14], are unrealistic to expect, and attempts to implement these models are impractical in light of the enormous effort and expenditure required [ 3, 14, 30, 32, 33].
The review did, however, elicit reasons for rejection: it found remarkably similar rationale to those detected in our study, including concerns that recommendations were too costly, inappropriate or unrealistic, or not within the organisation's power to implement.
But with the president's finger poised on the nuclear button, it might have seemed unrealistic for constitutional scholars to insist on a fundamental difference between the executive power to implement our foreign policy commitments and the power to terminate them.
The cost and resources required to implement airport-style security for trains and buses is simply too prohibitive and unrealistic, which is why they are, and will remain, exposed and targets of at-will attacks.
It is unrealistic to expect volunteers in the workplace to have all of these characteristics and competencies, together with the time and space to implement them.
Setting quotas at maximum sustainable yields by 2015 was "unrealistic," he said, and the discard ban was a "radical obligation" that legislators had adopted without understanding that in many cases it would be impossible to implement.
