RFID (radio
frequency identification)
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RFID
(radio frequency identification) is a form of wireless communication that incorporates
the use of electromagnetic or electrostatic coupling in the radio frequency
portion of the electromagnetic spectrum to uniquely identify an object,
animal or person. Use cases for RFID technology include healthcare,
manufacturing, inventory management, shipping, retail sales and home use. Every RFID system consists of three components: a scanning antenna, a transceiver and a transponder. When the scanning antenna and transceiver are combined, they are referred to as an RFID reader or interrogator. The transponder is located in the RFID tag itself.
The read range for RFID
tags varies based on factors including the type of tag, type of reader, RFID
frequency and interference in the surrounding environment or from other RFID
tags and readers. Generally speaking, tags that have a stronger power source
also have a longer read range.
RFID and bar code
technology are used in similar ways to track inventory, but three
important differences make each one a better choice in certain situations:
How RFID tags work
An RFID tag consists of a
microchip, memory and antenna. The antenna uses radio frequency waves to
transmit a signal that activates the tag's transponder. Once activated, the
transponder reads or writes data and transmits it back to the antenna for
wireless transmission to the reader. The data is used to notify a
programmable logic controller in the reader that an action should occur. The
action could be as simple as raising an access gate or as complicated as
interfacing with a database to carry out a monetary transaction.
RFID tags typically hold
less than 2,000 KB of data, including a unique identifier/serial number. Tags
can be read-only or read-write.
Types of RFID tagsThere are two main types of RFID tags: active RFID and passive RFID.
An active RFID tag has its
own power source, which is usually a low-power battery. A passive RFID tag,
on the other hand, does not require batteries. Instead, it receives its power
from the reading antenna, whose electromagnetic wave induces a current in the
RFID tag's antenna.
Types of RFID systemsThere are three main types of RFID systems: low frequency (LF), high frequency (HF) and ultra-high frequency (UHF). Microwave RFID is also available. Frequencies vary greatly by country and region.
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Catfishing
From Wikipedia,
the free encyclopedia
Catfishing is a type of deceptive activity where a person creates a
sock puppet
social networking
presence, or fake identity on a social network account,
usually targeting a specific victim for deception.
Catfishing is
often employed for romance scams on
dating websites. Catfishing may be used for financial gain, to compromise a
victim in some way, or simply as a form of trolling or wish fulfillment.
Catfishing
media has been produced, often centering around victims who wish to identify
their catfisher
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