Questões de Concurso

Experts Try to Gauge Health Effects of Gulf Oil Spill
                                              Wednesday, June 23, 2010

Atenção: Considere o texto abaixo para responder às questões de números 56 a 60.

London becomes 4G high speed internet hotspot

    London will begin to switch on 4G high-speed mobile internet with the launch of the first large-scale public trial in Britain. Initiated by O2, Britain's second largest operator with 22 million customers, the trial involves more than 25 masts covering 15 square miles. It will run for nine months, and the equipment installed will eventually become part of O2's first commercial 4G network.
    The technology is 10 times faster at navigating the internet than the current 3G networks, which often frustrate smartphone users because they are significantly slower than the average home broadband connection. The 25 masts in London will be able to carry more data than O2's entire national 3G network.
    Britain's 4G or long-term evolution (LTE) upgrade, expected to begin in earnest in 2013 after a much delayed spectrum auction, will make mobile networks powerful enough to handle video calls, high definition TV and live multi-player gaming. About 1,000 users will be invited to join the London trial.
    Initially, the O2 trial will not involve phones, because no compatible handsets exist yet. Samsung dongles will be handed out to plug into tablets and laptop computers, as will portable miniature modems that can create small WI-FI hotspots linking into O2's 4G infrastructure or "backhaul".
    The new technology is capable of speeds of up to 150 megabits per second. During the trial, users will be more likely to experience average speeds between 25Mbps and 50Mbps. When 4G is introduced nationally the average speeds are likely to drop to between 10Mbps and 15Mbps. This is faster than 3G, which averages between 1Mbps and 1.5Mbps, and compares well with the average household, fixed line broadband connection, which rose to just under 7Mbps this year.
    Live gaming against other players and video calling without delays will become possible from phones, because the speed at which new information loads onto the screen will be reduced from 1 second to 0.07 seconds.

(Adapted from www.guardian.co.uk, Sunday 13, November, 2011)

Atenção: Considere o texto a seguir para responder as questões de números 56 a 60.

    December 12, 2012
    If It’s for Sale, His Lines Sort It
    By MARGALIT FOX

    It was born on a beach six decades ago, the product of a pressing need, an intellectual spark and the sweep of a young man’s fingers through the sand.
    The result adorns almost every product of contemporary life, including groceries, wayward luggage and, if you are a traditionalist, the newspaper you are holding.
    The man on the beach that day was a mechanical-engineer-in-training named N. Joseph Woodland. With that transformative stroke of his fingers − yielding a set of literal lines in the sand − Mr. Woodland, who died on Sunday at 91, conceived the modern bar code.
    Mr. Woodland was a graduate student when he and a classmate, Bernard Silver, created a technology, based on a printed series of wide and narrow striations, that encoded consumer-product information for optical scanning.
    Their idea, developed in the late 1940s and patented 60 years ago this fall, turned out to be ahead of its time, and the two men together made only $15,000 from it, when they sold their patent to Philco. But the curious round symbol they devised would ultimately give rise to the universal product code, or U.P.C., as the staggeringly prevalent rectangular bar code (it graces tens of millions of different items) is officially known.

    Here is part of the story behind the invention:
    To represent information visually, he realized, he would need a code. The only code he knew was the one he had learned in the Boy Scouts.
    What would happen, Mr. Woodland wondered one day, if Morse code, with its elegant simplicity and limitless combinatorial potential, were adapted graphically? He began trailing his fingers idly through the sand.
    “What I’m going to tell you sounds like a fairy tale,” Mr. Woodland told Smithsonian magazine in 1999. “I poked my four fingers into the sand and for whatever reason − I didn’t know − I pulled my hand toward me and drew four lines. I said: ‘Golly! Now I have four lines, and they could be wide lines and narrow lines instead of dots and dashes.’ ”
    That consequential pass was merely the beginning. “Only seconds later,” Mr. Woodland continued, “I took my four fingers − they were still in the sand − and I swept them around into a full circle.”
    Mr. Woodland favored the circular pattern for its omnidirectionality: a checkout clerk, he reasoned, could scan a product without regard for its orientation.
    But that method − a variegated bull’s-eye of wide and narrow bands −, which depended on an immense scanner equipped with a 500-watt light, was expensive and unwieldy, and it languished for years.
    The two men eventually sold their patent to Philco for $15,000 − all they ever made from their invention.
    By the time the patent expired at the end of the 1960s, Mr. Woodland was on the staff of I.B.M., where he worked from 1951 until his retirement in 1987.
    Over time, laser scanning technology and the advent of the microprocessor made the bar code viable. In the early 1970s, an I.B.M. colleague, George J. Laurer, designed the familiar black-and-white rectangle, based on the Woodland-Silver model and drawing on Mr. Woodland’s considerable input.

(Adapted from http://www.nytimes.com/2012/12/13/business/n-joseph-woodland-inventor-of-the-bar-code-dies-at-91.html?nl=todaysheadlines&emc=edit_th_20121214&_r=0)