Why are ADHD medications prescribed for children? ADHD medications are prescribed to improve attention and reduce hyperactivity and impulsivity in children. They may also be used to improve ability to focus, work and learn. In addition, they may be used to reduce aggression, provide a calming effect and improve coping with frustration.
There are two type of access method random access and sequential access. To go from point A to point Z in a sequential-access system, you must pass through all intervening points. In a random-access system, you can jump directly to point Z.Disks are random access media, whereas tapes are sequential access media.
Here we focus only on the logical Access Control mechanisms. Access Control Mechanisms. Discretionary Access Control (DAC) As the name suggests, this access control model is based on a userâs discretion. i.e, the owner of the resource can give access rights on that resource to other users based on his discretion. Access Control Lists (ACLs) are a typical example of DAC.