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第40 至43 題為題組
Flickering lamps can induce headaches Phili
But if the flickering happens millions of times a second far
faster the eye can see or the brain process then it
Po do somethinity
like
1914.
VI 系
of Edinburgh Professor Harald Haas in a 2011 TED Talk, where he introduced the idea of “wireless data
C'Edn 630
from every light.” Today, Li-Fi has developed into a wireless technology that allows data to be sent at high
speeds, working with light-emitting diolelta
FLEDs), an incileasinati popular way to illuminate public areas
and homes.
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Using LED lights as networking devices data transmission, Li-Fi bas several advantages over Wi-
allots
walls or doors, unlike radio waves
waves used in Wi-Fi. As long as transparent materials like glass windows are
covered, access to a Li-Fi channel is liniited to devices inside the room, ensuring that signals cannot 2012
hacked from remote locations. Also, Li-Fi can operate in electrimagnetic sensitive areas such as ateities
whospitals, and nuclear power plants, for light does not interferentivith radio signals. The most
significant advantage of Li-Fi is speed.
1. Researchers have achieved speeds of 224.gidatuts per second in lab
conditions, much faster than Wi-Fi brokaband.
Egigabst]
How could Li-Fi enrich daily life? Anywhere there is LED lighting, there is an opportunity for Li-Fi
enabled applications. Li-Fi-enabled street lights could provide internet access to mobile phones, making
walking at night safer. The LED bulbs in traffic lights could provide drivers with weather conditions and
traffic updates. Li-Fi could help with tourism by providing an easier access to local information. At home,
smart light could also provide parents with solutions to their children's Internet addiction: Just turn off the
lights and you've turned off their access.
When 14 billion light bulbs mean 14 billion potential transmitters of wireless data, a cleaner, a greener,
and even a brighter future is on the way.
Tser
