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11/14/2011 The Universal Guillermo Cardenas Guzman 
Imagine that after completing their purchases and not have to make long lines at the cashier: on leaving the store a radio signal "sweeps" while stacked products in the cart and record the amount of the debt, which will be charged to your account or credit card. Another day goes to work and the doors open automatically when a system identifies you as an employee, either in the parking lot or at the reception, a database maintains the updated record of their inputs, outputs and delays. This scenario is part of daily life within a few years ago, when radio frequency identification systems (RFID in English, which have marginal uses, such as automatic toll paying motorways) is widespread, according to scientists and engineers anticipate specialists . "RFID technology and has many years but due to the high cost of receivers hardly used and now has gone down," said Jorge Cortes Galicia, School of Computing (ESCOM) of IPN. This system operates like a radar, the transmit and receive radio signals "bounce" in a tag with information. In addition, says researcher and professor of engineering polytechnic in computer systems, the frequency with which RFID operates (around 2 GHz) does not interfere with other electronic devices and allows for safer handling compared to other systems, such as codes of bars. Applications Unlike bar codes, which require a label without spots or erasures, RFID allows identification much faster and efficient because decodes the information from many sources at the same time and even tens of meters, without placing the label "line" with the reader. The labels or RFID tags store up to 3 times more information than a barcode and can be read even when they are inside a cardboard box, plastic or other container. In developed countries like EU and its use is common in the location of cars, animals, financial records and inventories of companies.
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