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       The next generation of smart phone could combine the date from its gyroscopes (陀螺仪) with a built-in compass to allow you to track your indoor movements even without GPS

       Research described it in the international Journal of Innovative Computing and Applications by Shahid Ayub of Lancaster University, and his colleagues there and at HW Communications, suggests that the embedded inertial sensors (嵌入式惯性传感器) in many smart phones have added the facility to be used for localisation and tracking applications. The primary benefit of using smart phones is that no additional infrastructure would need to be installed for monitoring personnel movements in a wide variety of situations not least staff, equipment and inventory movements in warehouse facilities, shopping malls and factories. In contrast, other technology being proposed would require new equipment,such as RFID technologies.

However, smart phones do not yet have the ability to pinpoint their location without recourse to the GPS system, which is not accessible indoors and has the added disadvantage of using up battery power very quickly even if it could be used. Inertial navigation only provides the necessary information relative to a specified starting point the team says. This is useful for anyone with a non-GPS smart phone who wishes to track the route they take when walking or jogging if they specify their starting point. The team suggests that pedestrians indoors could be positioned using a combination of the smart phone accelerometer(加速器) and an built-in digital compass, something that will become available in future smart phones.

They have now investigated the potential of three different smart phone placement modes: idle, hand held and listening, which could be used with pedestrian dead reckoning (PDR) techniques to allow users to record the path they follow or for various kinds of workplace or other monitoring requirements.

"The technique could be used in underground tube stations, airports , train stations where there is no infrastructure installed for tracking or navigation," Ayub explains, "It can also be used for location-based service applications. In big shopping malls it becomes easier to navigate to a target shop or meeting place, while in large offices and across industry it could be used to track employees and control movements of workers in restricted areas."

66.What is the primary benefit of using smart phones with embedded inertial sensors?

       A.They require new equipment, such as RFID technologies.

       B.They can track pedestrian movement indoors with GPS.

       C.No additional infrastructure would be needed.

       D.No additional money would be spent.

67.What can we know from the third paragraph?

       A.pedestrians indoors cannot be positioned using GPS.

       B.GPS can be used to locate pedestrians indoors.

       C.Smart phones with embedded inertial sensors can save a lot of energy.

       D.The current GPS system is perfect in many ways.

68.We can learn from the passage that the recent studies of smart phones      

       A.were conducted by Shahid Ayub alone

       B.were supported by GPS

       C.have no connection with everyday needs

       D.can be applied to underground tube stations

69.The next generation of smart phone will be able to        

       a.make it easier to find places in a big shopping mall

       b.track employees in large offices

       c.make GPS useless in train stations

       d.monitor the movements of workers in restricted areas

       A.a, b, c                    B.b, c, d                    C.a, b, d                    D.a, c, d

70.What would be the best title for the text?

       A.Tracking Pedestrians Indoors Using Their Smart Phones

       B.GPS Found to Have Defects

       C.Additional Infrastructure Should Be Constructed in Airports

       D.People Need to Replace Their Current Smart Phones

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