Slow wi-fi is a source of irritation that nearly everyone experiences. Wireless devices in the home consume ever more data, and it’s only growing, and congesting the wi-fi network. Researchers at Eindhoven University of Technology have come up with a surprising solution: a wireless network based on harmless infrared rays. The capacity is not only huge (more than 40Gbit/s per ray) but also there is no need to share since every device gets its own ray of light. This was the subject for which TU/e researcher Joanne Oh received her PhD degree with the ‘cum laude’ distinction last week.The system conceived in Eindhoven is simple and, in principle, cheap to set up. The wireless data comes from a few central ‘light antennas’, for instance mounted on the ceiling, which are able to very precisely direct the rays of light supplied by an optical fiber. Since there are no moving parts, it is maintenance-free and needs no power: the antennas contain a pair of gratings that radiate light rays of different wavelengths at different angles (‘passive diffraction gratings’). Changing the light wavelengths also changes the direction of the ray of light. Since a safe infrared wavelength is used that does not reach the vulnerable retina in your eye, this technique is harmless.
Daily Archives: March 23, 2017
Internet inventor Sir Tim Berners-Lee says misuse of data online is having a ‘chilling effect on free speech’
SIR Tim Berners-Lee, the man who invented the internet, said the impact of fake news is increasingly concerning and has unveiled plans to tackle “unethical” political advertising and the harvesting of data.The British computer scientist said on Sunday, exactly 28 years after his invention, the three new trends have become alarming in the last 12 months.In an open letter published in the UK, Sir Tim, 61, said misuse of data has created a “chilling effect on free speech” and warned of “internet blind spots” that are corrupting democracy.This photograph shows stories from USA Daily News 24, a fake news site registered in Macedonia. Both stories shown here are bogus. Picture: Raphael Satter/APSource:SuppliedOne problem, he wrote, is that most people find their news and information through a “handful” of social media sites and search engines, which are paid whenever someone clicks a link.“The net result is that these sites show us content they think we’ll click on, meaning that misinformation or fake news, which is surprising, shocking or designed to appeal to our biases, can spread like wildfire,” he added. “And through the use of data science and armies of bots, those with bad intentions can game the system to spread misinformation for financial or political gain.”