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 ?
- Scan Documents in an Instant: The Adobe Scan integration with Samsung's Bixby Vision means that the moment you're faced with a paper document, all you have to do is aim your camera at it, and Bixby and Adobe Scan will handle the rest.
THE research found more than a third of mums who've had extra scans did so because they felt anxious about their baby, leading experts to dub the phenomenon 'scanxiety'.
The phrase "Scan and Clear Codes" showing up on more estimates is somewhat of a misnomer.
In our study a cervical length of 29 mm by transabdominal scan could accurately predict a short cervix of 25 mm by transvaginal scan.
It is meta-stable radioisotope of artificially-produced element technetium having almost ideal characteristics i.e., gamma energy and half life, for a nuclear medicine scan.
Another two-thirds of the patients understood CT scans involve radiation, but less than half of those had learned about radiation risks from their doctor.
If you really do not wish to know if the baby has an abnormality, you may not need this scan. About half of the major abnormalities which cause serious difficulties will be seen on a scan and half will be unseen.
Dr Pearce said: "What we've been looking at is whether there is a potential cancer risk in children and young adults who have CT scans.
According to the company, its Certified PCI Scan Service allows merchants to schedule an automated network scan that verifies PCI DSS compliance and provides all required executive and technical reports.
The only way to improve these figures is with early diagnosis - and that means the use of scans.
The patients had undergone PET scans before their deaths, and their diagnoses were confirmed by autopsy.
The Trust says the move has had no impact on clinical care, and that all women will still have two scans as recommended.