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MessagePosté le: Ven 31 Aoû - 07:45 (2018)    Sujet du message: authentic-sam-gagner-canucks-jersey Répondre en citant

SAN FRANCISCO , Aug. 17 (Xinhua) -- Adding to the concern that network-enabled electronic devices could be co-opted to steal data or invade privacy, computer scientists have demonstrated how it is possible to transform such a device into a surveillance tool.

Such a tool can collect information about the body position and movements of the user.

In addition, by remotely hijacking a smart device to play music embedded with repeating pulses that track a person's position, body movements, and activities both in the vicinity of the device as well as through walls, the researchers at the University of Washington (UW) have shown how to track other people in the device's immediate vicinity.

Having created CovertBand , a software code able to turn smart devices into remote-controlled active sonar systems with built-in microphones and speakers, they plan to present their work at the Ubicomp 2017 conference, an Association for Computing Machinery (ACM) event on pervasive and ubiquitous computing, on Sept. 13 in Hawaii.

"The physical information CovertBand can gather - even through walls - sufficiently detailed for an attacker to know what the user is doing, as well as other people nearby," senior author Shyam Gollakota , a UW associate professor of computer science and engineering, was quoted as saying in a news release this week.

Active sonar systems, such as those on submarines, determine the position of objects by sending out an acoustic pulse. Those sound waves bounce off objects in their path, and the deflected waves can be picked up by a receiver to determine the object's position, distance and shape.

Through the speaker of a smartphone or other device , CovertBand sends out a repeating pulse of sound waves in the 18 to 20 kHz range. These sound waves are reflected when they encounter objects in their path. CovertBand uses the device's built-in microphones as a receiver to pick up these reflected sound waves. The smart device then transmits this information to the attacker, who could be a few feet, or meters, away or halfway across the globe.

The research team tested CovertBand's effectiveness using a smartphone hooked up to either a portable speaker or a standard flat-screen TV. In both cases, CovertBand's data could be used to decipher repetitive movements such as arm-pumping, walking or pelvic tilts to a range of up to 6 meters from the smartphone , with a positional error of 8 to 18 centimeters.

They also discovered that, with the portable speaker, CovertBand's pulses can transmit through thin, interior walls - though the range drops to 2 to 3 meters.

The 18 to 20 kHz repeating pulses are on the low range of what many people can hear accurately. To increase the range of surveillance and work through walls, the team increased the volume of these repeating pulses, which made them audible. To mask the sound , they "covered" the pulses by playing songs or other audio clips over them. Some songs work better than others, particularly compositions with repetitive, percussive beats.

The researchers said soundproofing a room and emitting a jamming signal at the same 18 to 20 kHz frequency range would prevent hacked devices or attackers in the next room from gathering information. Another potential defense could be to allow users to deactivate the speakers or microphones on their smart devices.

LANZHOU, China, July 16 (Xinhua) -- Italian cyclist Mattia Gavazzi from Amore & Vita- selle Smp came first on Thursday's race, Marko Kamp from Adri Mobil and Marco Zanotti from Italy came second and third respectively in the 11th stage of the 14th Tour of Qinghai Lake cycling race.

Kamp putting on the green jersey as the best sprinter , his teammate Radoslav Rogina was awarded the yellow jersey as the leader of general classification.

Hossein Alizadeh of RTS-Santic Racing Team retained his blue jersey, which represent the best Asian rider.

This stage is from Tianshui to Pingliang, covering a total distance of 240 kilometers,it's also the longest stage in this year.

The 2015 Tour of Qinghai Lake will last 14 days for a total distance of 2,940 kilometers.
Get Rid of Unwanted squirrels From Your Home Cords Blasco
Submitted 2014-02-12 09:22:43 Squirrels are serious problem for many family members. They can due to the fact lot's of damage: these people eat dog birds, ruin our plant plants and could stole food from house too. They are sweet animals , but those troubles are annoying, best way to solve all of them is to get rid of squirrels. Thus how to get rid of squirrels? Fortunately there are some ways to do that and if you follow this methods no longer about squirrels All this method are usually nicely created and didn't intention to harm human beings or squirrels.

First method how to get rid of squirrels is to remove all possible food (nuts, fruits, acorns and and so forth ) from gardenoutdoor which squirrel eats, this is the main resource of food for them so maybe your are is attractive regarding squirrels, because there are lots of food for them and they maintain "having fun" in your neighborhood. Without having that food they will move to one more , more attractive location. Also it would be great should you check you're inside, attic or chimney for foods, if there are some sources of foods maybe which is the reason why squirrels remain friendly together with you.
Second method how to get rid of squirrels is to make sure that squirrels aren't stuck in fireplace or attic. Often squirrels jump directly into chimney and then they live presently there, because there is not a way to back, but when you s.

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MessagePosté le: Ven 31 Aoû - 07:45 (2018)    Sujet du message: Publicité

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