問22
頻出度★★☆
ICタグを使用した機能の事例として, 適切なものはどれか。
平成29年度 春期 ITパスポート試験 問22
ストラテジ系ビジネスインダストリ › ビジネスシステム
This question's explanation and your answers so far.
解説
問 22
Incorrectア
Reading a barcode at a POS register uses an optical scanner (laser or light) to read black-and-white stripes, which is a different technology from an IC tag that uses radio waves. A barcode must be read one at a time by aligning it with the line of sight, so it is not an example of an IC tag.
Incorrectイ
Image distribution in a telemedicine system sends and receives data such as medical images over a network, and an IC tag is not involved. It is a communication and image transmission technology, not an example of a wireless tag function.
Incorrectウ
A car navigation system determines the current location by receiving satellite radio waves from GPS (Global Positioning System) and calculating the position, which has nothing to do with an IC tag. What is used for positioning is the signal from GPS satellites, not the reading of a tag.
- エ
正解 An IC tag (RFID) has a tiny IC chip and an antenna built in, and it is a mechanism that reads and writes data without contact by using radio waves (wireless). At a library anti-theft gate, an IC tag is attached to each item; when an item that has not gone through the proper borrowing procedure passes through the gate, the gate antenna detects the radio waves from the tag and sounds an alarm. Reading needs no light or line of sight (unlike a barcode, which must be looked at directly), and many tags can be detected at once without contact — this very feature is applied directly to this anti-theft (removal monitoring) use. Therefore “エ” is the appropriate example.
ここがポイント
- An IC tag (RFID) = a mechanism with a built-in IC chip and antenna that reads and writes data by radio waves, contactless and in bulk. Typical uses include entry/exit management, inventory management, electronic money, and anti-theft.
- Distinguish similar automatic identification methods that use different technologies: a barcode is optical and read one at a time by direct sight; GPS uses satellite radio waves for positioning; an IC tag uses radio waves for contactless reading of multiple items at once.
用語