Discuss a recent example of an unknown-unknown risk that proved damaging to a supply chain
A、headlines
B、headquarters
C、heaven
D、horizon
Polygraphs, which have been used for decades, have been joined by new systems that purportedly analyze a person's voice, blush, pupil size and even brain waves for signs of deception. The devices range from costly experimental devices that use strings of electrodes or thermal imaging to $19. 95 palm-sized versions.
No studies have ever proven that lie detectors work. Many show that they assess truth as accurately as a coin flip; in other words, not at all. Still, some people have come to depend on them. The recent proliferation of lie detectors has reignited a decades-old debate over the ethics and politics of when and how they should be used and whether such important questions as guilt or innocence should be left to machines.
Mankind has looked for centuries for a physical indicator that would expose a liar. The Romans studied the entrails of suspected liars. In China, rice was shoved into the mouths of interviewees to measure how dry they were -- the drier the mouth, the more likely the person was lying, it was thought. Other cultures tried various chemical concoctions, but they worked no better than chance.
Especially since September 11, law enforcement agencies consider lie detection systems critical to their investigations. The CIA, FBI and Defense Department have spent millions of dollars on them. In an unusual plea made soon after the terrorist attacks, the government asked for the public's help in building counterterrorism technologies, among them a portable polygraph.
In the United States, there is a double standard when it comes to the use of polygraphs. Although the so-called lie detector is considered an important law enforcement tool, polygraph data are inadmissible as evidence in a court of law. The US Supreme Court forbade private companies from using them to screen job applicants, but allowed the government to use them for the same purpose.
As debate about polygraphs rages, the devices are being phased out in favor of voice analyzers, which are more portable and easier to use. A voice analyzer device typically consists of a telephone and microphone attached to a computer that packs neatly in a briefcase, or attached to any PC with the proper software installed. Most of the analyzers can be used in person or over the phone. Conversations can be tested in real time or recorded for later analysis.
First, the questioner asks an interviewee about something he or she would have no reason to lie about, such as "When's your birthday?" Then he asks what he really wants to ask. The device makes an assessment about whether the subject is telling the truth based on the differences between the inaudible microtremors in the voice during the first round of questioning and those in the second.
The federal government officially says it does not use these voice lie detectors. Still, the voice technology has its true believers, among them more than 1,200 police departments nationwide and tens of thousands of consumers.
The slightly more sophisticated Truster software program that runs on a desktop computer gives text rating of truthfulness. The companies that market these technologies say they are more than 80 percent accurate.
Though skeptical, Rick Garloff, a 35-year-old American, still said even if the systems are not great lie detectors, they are wonderful lie deterrents. He once used the Truster on his 9-year-old son, to see if he had forgotten to close a door, accidentally letting the d
Even as the U.S. Senate debates a vast new tax and spend regime in the name of fighting climate change, a more instructive argument was taking place in Copenhagen, Denmark. Some of the world's leading economists met earlier this month to decide how to do the most good in a world of finite resources.
Scarcity is a core economic concept. There isn't an unlimited amount of money to be spent on every problem, so choices have to be made. The question addressed by the Copenhagen Consensus Center is what investments would do the most good for the most people. The center's blue-ribbon panel of economists, including five Nobel laureates, weighed more than 40 proposals to improve the world by spending a total of $75 billion over the next four years.
What would do the most good most economically? Supplements of vitamin A and zinc for malnourished children.
Number two? A successful outcome to the Doha Round of global flee-trade talks.
Global warming mitigation? It ranked 30th, or last, right behind global warming mitigation research and development.
On the benefits of freer trade, it was estimated that a successful Doha Round could generate up to $113 trillion in new wealth during the 21st century, at a cost of $420 billion or less from inefficient industries going bust.
Meanwhile, providing vitamin A and zinc would help some 112 million children in sub-Saharan Africa and South Asia for merely $60 million a year. The minerals would help prevent blindness and stunted growth—increasing lifetime productivity by an estimated $1 billion. Similar if not quite so bountiful returns apply to investments in iron supplements, salt iodization and deworming, all low-cost measures that the economists in Copenhagen ranked highly.
在下图中,二极管D1、D2的工作状态是( )。
A、D1、D2均导通
B、D1、D2均截止
C、D1导通,D2截止
D、D1、截止、D2导通
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