https://dkriesel.com/en/blog/2013/0802_xerox-workcentres_are...
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European intelligence services assess the three documented ships as operating “with high confidence“ on behalf of Russian interests. Their movement profiles are “very conspicuous” and show “little evidence of commercial activity.”
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...of course they know, but for whatever reason they didn't find a smoking gun so far (e.g. drones on the ships or drones taking off/landing) - or maybe they did but keep it to themselves.
> Official inspections were “symbolic”—not all containers opened
...this might to be the core of the problem.
Yes agree. There is no incentive that intelligence services would communicate their findings, in fact it's the opposite lol
Might be related to https://www.teaminternet.de/en/parkingcrew
Zero-padding helps you to find the true position (frequency) of a peak in the DFT-spectrum. So, your frequency estimates can get better. However, the peaks of a DFT are the summits of hills that are usually much wider than compared to other techniques (like Capon or MUSIC) whose spectra tend to have much narrower hills. Zero-padding does not increase the sharpness of these hills (does not make them narrower). Likewise the DFT tends to be more noisy in the frequency domain compared to other techniques which could lead to false detections (e.g. with a CFAR variant).
Though the DFT can be implemented efficiently using the Fast Fourier Transform (FFT) algorithm, the DFT is far from being the best estimator for frequencies contained in a signal. Other estimators (like Maximum Likelihood [ML], [Root-]MUSIC, or ESPRIT) are in general far more accurate - at the cost of higher computational effort.
The FFT is still easy to use, and it you want a higher frequency resolution (not higher max frequency), you can zero pad your signal and get higher frequency resolution.
Lol, this will be potentially much slower than using the general matmul kernel.
However, I like this kind of research because it really exploits specific hardware configurations and makes it measurable faster (unlike some theoretical matmul improvements). Code specialization is cheap, and if it saves in the order of a few %, it quickly reimburses its price, especially for important things like matmul.