One of package methods of IC tip/chip. Those which allot the pin for external input/output to the all around of the package.

QIC

Reading: Quick
Full spelling: Quarter-Inch Cartridge Drive Standards
Field:
Storage > magnetic tape > QIC

The group which does the magnetic tape cartridge of 1/4 inch width and the standardization regarding drive. In addition, the standard which is decided by the same group. Memory capacity at the time of incompressible is 80MB - 15GB.

qmail

Reading: Queue/cue mail
Field:
Internet > mail > qmail

Daniel J of the American Illinois university. Bernstein professor developed, the E-mail server software (MTA). It was developed on the basis of the reflection of the problematical point which sendmail which is in fact standard of MTA has.

sendmail while setting is possible finely with many functions, method of writing the setting file being complicated, is difficult. In addition, after being announced, to presently the program complicates by the fact that you do many update, the security hole is discovered frequently due to the fact that conservativeness decreases. In addition, the case where abundant mail delivery is done it is said, that performance is low, qmail is something which was developed on the basis of these problematical points.

QoS

Reading: Queue/cue o s
Full spelling: Quality of Service
Field:
Network technology > network control > QoS

The technology which with respect to network, reserves the zone for communicating a certain specification, guarantees fixed transmission speed. It has been mounted on ATM already. For, the delay of communication such as sound and real time transmission of animated picture (service of radio & television type) and viewphone and the service where stop is not permitted important technology. Because QoS is actualized on Internet where various communication below exist together, engineering development such as decision of standard protocol RSVP is advanced.

QPSK Four phase deviation irregularities

Reading: The Kewpie s k
Full spelling: Quadrature Phase Shift Keying
Alias:
4 phase deviation irregularities
Field:
Network technology > QPSK

One of the modulation techniques which convert digital value to the analog signal. One kind of phase deviation modulation technique which expresses information with combination of the plural waves where phase slips.

With QPSK, the sine wave and 90 degrees and 180 degrees which become standard, the total where 270 degree phase slips you use the wave of four, 4 values (2 bits) information sending and receiving you are possible at one time by the fact that another value is allotted to each one. It is the modulation technique which is used for digital satellite broadcast and cable modem etc.

QQVGA

Reading: Queue/cue queue/cue buoy Gee a
Full spelling: Quarter Quarter VGA
Field:
Imaging > display > structure > QQVGA

It is resolution of 160×120 pixel. VGA (640×480 pixel) with in comparison, because 1/4 (quarter) furthermore 1/4 is at area ratio, this way it is called. It is used with small-sized equipment such as portable telephone.

QR cord/code

Reading: Queue/cue earl cord/code
Full spelling: Quick Response code
Field:
IT and society > [yubikitasu] > QR cord/code

One of systems of 2 dimensional cord/code which [densouebu] developed in 1994. It is adopted for the address reading function and the like of the portable telephone.

With the matrix type 2 dimensional cord/code where equal to length and breadth same number arranges the point in small square, 21 it arranged the QR cord/code into one side, “version 1” the empty, 177 it arranged, to “version 40”, specification of 40 sorts is prepared. The one where the number of points is many can record many items of information, but the necessary area keeps becoming large. In three angles of the QR cord/code letter type “of the time” “it quarries out and symbol” (finder pattern) is arranged, grasps from 360 degree whichever direction and is designed in such a way that it can read out information accurately.

The amount of information which can be recorded to the QR cord/code is the maximum of 23,648 bits with in case of version 40. Because with the QR cord/code the individual character code is used, if [kana] and Chinese character if 1,817 letters, just alphabet and the number if 4,296 letters, just the number it can record to 7,089 letters. Redundancy is given in the data, part stains and cannot grasp and also the [te] can restore the data. Be able to set to 4 stages, being the lowest one, approximately 7%, being the highest one, it can correspond the error correction ratio which is used with the QR cord/code up to approximately corruption 30%. As for error correction ratio because many redundant data than high extent become necessary, the data quantity which can be recorded is that much restricted.