scan

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scan

Med
a. the examination of a part of the body by means of a scanner
b. the image produced by a scanner

scan

[skan]
(computer science)
To examine information, following a systematic, predetermined sequence, for some particular purpose.
(electronics)
The motion, usually periodic, given to the major lobe of an antenna; the process of directing the radio-frequency beam successively over all points in a given region of space.
(engineering)
To examine an area, a region in space, or a portion of the radio spectrum point by point in an ordered sequence; for example, conversion of a scene or image to an electric signal or use of radar to monitor an airspace for detection, navigation, or traffic control purposes.
One complete circular, up-and-down, or left-to-right sweep of the radar, light, or other beam or device used in making a scan.

scan

scan
scanclick for a larger image
Two of the techniques for scanning primary flight instruments.
scanclick for a larger image
Scanning by lobe comparison.
i. To search the sky for any hostile aircraft. The area of the scan for a typical two-aircraft formation is indicated in the illustration. In flight, the term means “Search the sector indicated and report any contacts.”
ii. To make a sweep of selected flight instruments or an external scene with the eyes.
iii. The path periodically followed by a radiation beam. See helical scan and conical scanning.
iv. The motion of an electronic beam through space looking for a target. Scanning is carried out by the motion of the antenna or by lobe switching.

SCAN

(1)
["A Parallel Implementation of the SCAN Language", N.G. Bourbakis, Comp Langs 14(4):239-254 (1989)].

SCAN

(2)
A real-time language from DEC.

scan

(3)
(computer peripheral) See scanner.

scan

(4)
(circuit design) See scan design.

scan

(5)
(functional programming) See scanl, scanr.

scan

(storage, algorithm)
An algorithm for scheduling multiple accesses to a disk. A number of requests are ordered according to the data's position on the storage device. This reduces the disk arm movement to one "scan" or sweep across the whole disk in the worst case. The serivce time can be estimated from the disk's track-to-track seek time, maximum seek time (one scan), and maximum rotational latency.

Scan-EDF is a variation on this.

scan

(1) To make an electronic comparison of a signal, pixel or data structure as described in the following definitions.

(2) In optical technologies, to read a printed form a line at a time in order to convert images into bitmapped representations or convert characters into text. See OCR.

(3) In video, to move across a picture frame a line at a time, either to detect the image in an analog or digital camera, or to refresh a CRT display.

(4) To search a data file sequentially for specific content.

(5) To search an executable file for a particular pattern. See antivirus program.

(6) To sequentially search for peripheral devices attached to the computer.
References in periodicals archive ?
Breaking that block into smaller chunks makes the content more scannable and readable.
Working with the location-based social media site foursquare, the couponing program lets shoppers check in to any Walgreens location through foursquare and receive a unique scannable coupon that they can redeem at that store.
Those with scannable remittance documents take the retail track and are posted quickly and automatically nearly all of the time--"in the high 90s," percentagewise, Ingoglia says.
The system makes electronic coupons presented on a phone or other mobile device scannable, so shoppers need only their phones or other handheld devices to redeem a coupon.
This redesign presents information in a format that allows you to access it by reading in depth or more quickly by breaking out key points that make articles easily scannable. After all, think about how executives and trustees like information presented to them.
On various matters @Brumhippodrome: Next time you are in our foyers check out our social networking pop-ups - complete with scannable QR codes!
Ivy also incorporated a scannable quick response (QR) feature in their print ads that enables smartphone users to access specific online content."
Additional nice touches include: a list of smartphone applications related to the tool, along with a scannable QR code that readers with smartphones can use to quickly access each tool's website.
Electro-Sensors operates through two business units: its Controls Division, which supplies electronic instruments used to monitor shaft speeds in production lines and precision motor controllers for synchronising the motors on process machines; and its AutoData Systems division, which develops desktop software for designing scannable forms such as customer surveys and automated data collection using scanners for forms processing.
The Lotte credit card application allows the viewer to access over 100 screens, location-based features and scannable mobile coupons.
WORLDWIDE COMPUTER PRODUCTS NEWS-April 18, 2011-AutoData Systems updates Scannable Office software(C)1995-2011 M2 COMMUNICATIONS http://www.m2.com
The QR is a scannable code which calls up the pharmaceutical company's website and matches the product with a database, Fairley said.