(fâls ri-jek´shun) (n.) In biometrics, FRR, or false rejection rate is the instance of a security system failing to verify or identify an authorized person. Also referred to as a type I error, a false rejection does not necessarily indicate a flaw in the biometric system; for example, in a fingerprint-based system, an incorrectly aligned finger on the scanner or dirt on the scanner can result in the scanner misreading the fingerprint, causing a false rejection of the authorized user.
The false rejection rate is the measure of the likelihood that the biometric security system will incorrectly reject an access attempt by an authorized user. A system’s FRR typically is stated as the ratio of the number of false rejections divided by the number of identification attempts.
Compare to false acceptance.
- fat client
In a client/server architecture, a client that performs the bulk of the data processing operations. The data itself is stored on the server. See thin client for contrast. Although the term usually refers to software, it can also apply to a network computer that has relatively strong processing abilities.
- fatal error
An error that causes a program to abort. Sometimes a fatal error returns you to the operating system. When a fatal error occurs, you may lose whatever data the program was currently processing. Contrast with fatal system error, an operating system-specific error.
- fatal exception error
A type of program error that requires that the program responsible for the error be shut down. Software applications communicate with operating systems and other applications through layers of code. An exception is an error alert that communicates the problem across the layers. When an error is detected, the exception is sent through the layers […]
- Fault Tolerance
The ability of a system to respond gracefully to an unexpected hardware or software failure. There are many levels of fault tolerance, the lowest being the ability to continue operation in the event of a power failure. Many fault-tolerant computer systems mirror all operations — that is, every operation is performed on two or more […]
(pronounced as separate letters) Short for field-replaceable unit, a generic term used to describe any hardware device, or more commonly a part or component of a device or system, that easily can be replaced by a skilled technician without having to send the entire device or system to be repaired. The name implies that the […]