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The Davies–Bouldin index (DBI), introduced by David L. Davies and Donald W. Bouldin in 1979, is a metric for evaluating clustering algorithms. [1] This is an internal evaluation scheme, where the validation of how well the clustering has been done is made using quantities and features inherent to the dataset.
When actual measurements of an antenna's gain are made by a laboratory, the field strength of the test antenna is measured when supplied with, say, 1 watt of transmitter power, at a certain distance. That field strength is compared to the field strength found using a so-called reference antenna at the same distance receiving the same power in ...
A test data set is a data set that is independent of the training data set, but that follows the same probability distribution as the training data set. If a model fit to the training data set also fits the test data set well, minimal overfitting has taken place (see figure below). A better fitting of the training data set as opposed to the ...
The result now should converge to N times the element gain, or + 9 dBi = 33.1 dBi. The actual result is in fact, 33.1 dBi. [8] For antenna arrays, the closed form expression for Directivity for progressively phased [9] array of isotropic sources will be given by, [10]
The ideal dipole antenna could be further replaced by an isotropic radiator (a purely mathematical device which cannot exist in the real world), and the receiver cannot know the difference so long as the input power is increased by 2.15 dB. The distinction between dB d and dB i is often left unstated and the reader is sometimes forced to infer ...
Distributed testing tool. Can output to multiple formats, like the TAP format, JUnit XML or SubUnit. htf: Yes: Yes: Yes: Yes [481] Professional testing tool. Can output to multiple formats. Focus on reporting. Industry ready. Usable for hardware in the loop testing. Part of Hilster's QABench. Free community-license. TwistedTrial: Yes: Yes: Yes ...
Automated test suites contain user's interactions through the system's GUI, for repeatable testing. Each test begins with a copy of the "before" image reference database. The "user interactions" are replayed through the "new" GUI version and result in the "post test" database. The reference "post test" database is compared to the "post test ...
The FR line then sets the test frequency to 46.29 MHz. FR lines can optionally define the number and magnitude of the frequency steps if the system is being used to analyze the performance across a range of frequencies, but this is not being used in this case.