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  2. Operating system - Wikipedia

    en.wikipedia.org/wiki/Operating_system

    An operating system ( OS) is system software that manages computer hardware and software resources, and provides common services for computer programs . Time-sharing operating systems schedule tasks for efficient use of the system and may also include accounting software for cost allocation of processor time, mass storage, peripherals, and ...

  3. User identifier - Wikipedia

    en.wikipedia.org/wiki/User_identifier

    User identifier. Unix-like operating systems identify a user by a value called a user identifier, often abbreviated to user ID or UID. The UID, along with the group identifier (GID) and other access control criteria, is used to determine which system resources a user can access. The password file maps textual user names to UIDs.

  4. Resource Access Control Facility - Wikipedia

    en.wikipedia.org/wiki/Resource_Access_Control...

    Identification, classification and protection of system resources; Maintenance of access rights to the protected resources (access control) Controlling the means of access to protected resources; Logging of accesses to a protected system and protected resources (auditing) RACF establishes security policies rather than just permission records ...

  5. Comparison of operating systems - Wikipedia

    en.wikipedia.org/.../Comparison_of_operating_systems

    The article "Usage share of operating systems" provides a broader, and more general, comparison of operating systems that includes servers, mainframes and supercomputers . Because of the large number and variety of available Linux distributions, they are all grouped under a single entry; see comparison of Linux distributions for a detailed ...

  6. Design of the FAT file system - Wikipedia

    en.wikipedia.org/wiki/Design_of_the_FAT_file_system

    The FAT file system is a file system used on MS-DOS and Windows 9x family of operating systems. It continues to be used on mobile devices and embedded systems, and thus is a well suited file system for data exchange between computers and devices of almost any type and age from 1981 through the present.

  7. MIM-104 Patriot - Wikipedia

    en.wikipedia.org/wiki/MIM-104_Patriot

    Patriot's radar is somewhat unusual in that it is a "detection-to-kill" system, meaning that a single unit performs all search, identification, track, and engagement functions. Most other SAM systems, by contrast, require several different radars to perform all functions necessary to detect and engage targets.

  8. Mizar system - Wikipedia

    en.wikipedia.org/wiki/Mizar_system

    History. The Mizar Project was started around 1973 by Andrzej Trybulec as an attempt to reconstruct mathematical vernacular so it can be checked by a computer. Its current goal, apart from the continual development of the Mizar System, is the collaborative creation of a large library of formally verified proofs, covering most of the core of modern mathematics.

  9. Subspace identification method - Wikipedia

    en.wikipedia.org/wiki/Subspace_identification_method

    Subspace identification method. In mathematics, specifically in control theory, subspace identification ( SID) aims at identifying linear time invariant (LTI) state space models from input-output data. SID does not require that the user parametrizes the system matrices before solving a parametric optimization problem and, as a consequence, SID ...