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what is photodna?

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PhotoDNA  is a technology developed by  Microsoft  and improved by  Hany Farid  of  Dartmouth College  that computes  hash  values of images, video and audio files to identify similar images. [1]  PhotoDNA is primarily used in the prevention of child pornography, and works by computing a unique hash that represents the image. This hash is computed such that it is resistant to alterations in the image, including resizing and minor color alterations. [1]  It works by converting the image to black and white, resizing it, breaking it into a grid, and looking at intensity gradients or edges. [2] It is used with Microsoft's own services  Bing  and  OneDrive , [3]  as well as by  Google Gmail ,  Twitter , [4]   Facebook , [5]   Adobe Systems [6]  and the  National Center for Missing & Exploited Children , [7]  to whom Microsoft donated the technology. Microsoft donated the ...
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HYDROGEN OR BATTERIES? Which is best?

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Hydrogen  Vs  Batteries Hydrogen cars   have long ranges RANGE: 700+ km. REFUELING : In a few minutes. CHALLENGE: Few filling stations and expensive production method. ADVANTAGE: Hydrogen can store energy from renewable sources such as solar cells and wind turbines. Battery-powered cars get   their energy from the grid RANGE: A maximum of 500 km. RECHARGING: 1-12 hours. CHALLENGE: Short range and very long charging time. ADVANTAGE: Communicate with the future grid, so the power can be as cheap as possible. Hydrogen stores energy well   The major sales argument for hydrogen is its   ability to store energy. Hydrogen contains 120   mega joules  of energy per kg – compared to 44   for petrol. At best, batteries can store 2-3   mega joules  per kg. a   fully   fueled hydrogen   car has a range of 6-700 km, which is about the   same ...
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Type of RAM that reduces power consumption by 99%

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Ferroelectric RAM Ferroelectric RAM known as FRAM is similar in construction to the storage cell in widely used DRAM in that both cell types include one capacitor and one access transistor. In a DRAM cell capacitor, a linear dielectric is used, whereas in an FRAM cell capacitor the dielectric structure includes ferroelectric material, typically lead zirconate titanate. FRAM requires far less power to flip the state of the polarity and does so much faster. Power usage about 99% lower than DRAM  FRAM makes  use  of  Ferroelectric  film  to  store  the  data. The ferroelectric film  is  polarised  to  a  “0”  or  “1”  state  when  the  voltage  is  applied  and  remains  stable  in  the  state  even  when  the   voltage  is  removed. Advantages Lower power usage Faster write performance Much larg...
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