题型:阅读理解 题类:常考题 难易度:普通
山东省烟台市2017-2018学年高二下学期英语期末考试试卷(音频暂未更新)
There are a lot of reasons why people calling 911 might not be able to tell operators which floor they're on in a high-rise building. They could be injured or simply confused. Yet precious minutes are wasted when emergency personnel have to search a building to find a person in need. With a new app called Sensory, emergency responders soon may be able to use a caller's smartphone to locate his exact position in a building.
Columbia University researchers William Falcon and Henning Schulzrinne created Sensory using a two-step process. First, they used all existing smartphone features that help narrow down a caller's location. All iPhones produced after 2014 already include GPS and altimeter(测高仪) that can help emergency responders determine if a person is outdoors or inside a building. But when it comes to tall buildings, just knowing a person's altitude may not be enough,because the distance between floors changes from one building to another.
So Falcon and Schulzrinne analysed the plans of figuring out the average distance between floors in residential(住宅的)buildings and office buildings among more than 1000 buildings in New York City. They tested their app in 63 experiments in five high-rise buildings and found that it could find a caller's location within two floors with about a 91 percent accuracy.
In a survey conducted by Find Me 911 this year, dispatchers(调度员)said that they regularly received calls from people in need who often couldn't share their location. They sometimes accidentally give the wrong address or floor number. Some callers are too young to know their address. Dispatchers also received calls from those who are deaf or have hearing problems and they often couldn't hear the operator's questions.
The new Sensory app could help shave precious minutes off the time it takes first responders to get to those calling for help. And it could make the difference between life and death.
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