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Chairman, Vice-Chairmen and Members
Chairman, Vice-Chairmen and Members

... the Computer Science and Information Technology (CIT) department has been established in 1998 and working toward this goal. At present there are 12 qualified full time teachers, several part-time teachers and 5 other staffs in the department. Few more experienced teachers are expected to join in the ...
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... There are a few cases where this value can be longer than 20 bits. For example, if the segment register contains 0xfff0 and the offset is 0xfff0, the resulting address is 0x10fef0. We will touch on this again when we talk about the A20 address line. ...
Chapter Four : Processor Management
Chapter Four : Processor Management

... • PCB of job created when Job Scheduler accepts it – updated as job goes from beginning to termination. • Queues use PCBs to track jobs. – PCBs, not jobs, are linked to form queues. – E.g., PCBs for every ready job are linked on READY queue; all PCBs for jobs just entering system are linked on HOLD ...
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... the front desk at any time. It usually starts with the operating system. • Since system services has the dual nature of self-starting and background running, it is often preferred by mobile phone virus program. ...
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...  A root directory can be subdivided into smaller lists; each list is called a sub-directory  Each subdirectory is depicted as a folder  A computer file’s location is defined by a file path, which on a PC includes the drive letter, folder(s), file name, and extension Unit 6: Software ...
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第五章输入输出

... Basic format: encoding every byte in a 14-bit symbol. A group of 42 consecutive symbols forms a 588-bit (42x14=588) frame 帧. Each frame holds 192 data bits (24 bytes). The remaining 396 bits are used for error correction and control. Grouping of 98 frames into a sector 扇区. Every sector begins with a ...
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1707 Systems Software - Career and Technical Education

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... Hotspot Shield Vpn Getjar - A virtual private network (VPN) extends a private network across a public network, such as the Internet. It enables a computer or network-enabled device to send and receive data across shared or public networks as if it were directly connected to the private network, whil ...
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... – IDEA: extend the physical memory by using a “fast” mass storage system (disk) • Some of the processes stay in memory, some are temporarily saved on the disk • When a process must be executed, if on the disk, it is first loaded in memory and then executed • This technique is called “swapping” OS Co ...
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... efficiently — for the disk drives, this means having a fast access time and disk bandwidth. Access time has two major components – Seek time is the time for the disk arm to move the heads to the cylinder containing the desired sector. – Rotational latency is the additional time waiting for the disk ...
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... methods of notification will be provided by WMATA. No price adjustments will be made for any delays resulting from an installation closing. When area radio stations, TV stations or WMATA’s website report that a facility has "delayed reporting" until a particular time, the Contractor's personnel have ...
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History and Demise of CPM

... way on every 8080-based computer, other software developers were also relieved of the necessity of adapting their software products to each new machine -- they could write to be compatable with CP/M, and let it take care of the details of doing the I/O. Kildall was an engineer, not a businessman, bu ...
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Demise of CPM

... way on every 8080-based computer, other software developers were also relieved of the necessity of adapting their software products to each new machine -- they could write to be compatable with CP/M, and let it take care of the details of doing the I/O. Kildall was an engineer, not a businessman, bu ...
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... Shared Resource: A shared resource is a resource that can be used by more than one task. Each task should gain exclusive access to the shared resource to prevent data corruption. This is called Mutual Exclusion. For e.g., a global variable can be used by many tasks, or printer which could be shared ...
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Colour version (for viewing)

... queue has a priority associated with it. Queues with higher priority can be given more time-slices for each process. Different scheduling algorithms can be used for scheduling within queues. “ E.g. separate ready-queue in foreground (for interactive processes) and background (for batch processes) qu ...
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... • multiprogramming means having multiple processes existing at the same time • most modern, general purpose operating systems support multiprogramming • all processes share the available hardware resources, with the sharing coordinated by the operating system: – Each process uses some of the availab ...
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Unix security

Unix security refers to the means of securing a Unix or Unix-like operating system. A secure environment is achieved not only by the design concepts of these operating systems, but also through vigilant user and administrative practices.
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