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美国Newsweek的一篇新闻报道。

Newsweek即《新闻周刊》,是美国时政杂志中因评论优秀而获得荣誉最多的周刊。它与《时代周刊》《美国新闻与世界报道》并称为美国三大新闻周刊。

在美国,《新闻周刊》是仅次于《时代》的周刊,但有时它的广告收入会超过《时代》。在发行量上,它超过了《美国新闻和世界报道》。在这三份期刊中,《新闻周刊》的观点通常被视作比《时代》更自由而比《美国新闻和世界报道》更保守。

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原文:

As data breaches and identity theft become more and more common, the market is growing for biometric technologies—like fingerprint or iris scans—to keep others out of private e-spaces. They’re still expensive, though, and some balk at the prospect of having deeply personal identifiers taken and maintained by a third party.Researchers from Georgia Tech say they have come up with a low-cost device that gets around some of these issues: a smart keyboard. This contraption precisely measures the cadence with which one types and the pressure fingers apply to each key. These patterns are unique to each individual, says Jun Chen, a doctoral engineering student. By measuring how somebody types a password, he says, the keyboard can determine people’s identities, and thus, by extension, whether they should be granted access to the computer it’s connected to—regardless of whether someone gets the password right.It also doesn’t require a new type of technology that people aren’t already familiar with. “Everybody uses a keyboard…and everybody types differently,” Chen says.The device also harnesses energy when fingers touch keys—energy that could be used to, for example, power a wireless emitter and eliminate the need for a cord. The keys are made of layers of polymers that harbor a slightly negative charge, whereas skin is partially positively charged, Chen explains. When fingers come into contact with the keys and press down, and lift again, they transfer electrons to the keys. This completes an electric circuit with the keyboard, producing a small current.

The smart keyboard powers itself by generating electricity when a person’s fingertips make contact with its multi-layer plastic materials. The keyboard could offer a stronger layer of security by analyzing things like the force of a user’s typing and the time between key presses.

This phenomenon, called “contact electrification,” is the same process that creates static electricity, Chen says: “It’s like when you run your hand across a wool blanket and see ‘sparks’ in the darkness.” Only to a lesser and invisible degree.In a study describing the technology published in the journal ACS Nano, the researchers had 100 volunteers type the word touch four times using the keyboard. Data gleaned from the device could be used to identify individual participants based on how they typed, with very low error rates, Chen says. So far, there is just one working prototype of the intelligent keyboard. But, Chen says, it should be pretty straightforward to commercialize and is mostly made of inexpensive, plastic-like parts. The team hopes it could make it to market in about five years.

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