Computer Memory

Memory

In computing, memory refers to the physical devices used to store programs (sequences of instructions) or data (e.g. program state information) on a temporary or permanent basis for use in a computer or other digital electronic device. The term primary memory is used for the information in physical systems which function at high-speed (i.e. RAM), as a distinction from secondary memory, which are physical devices for program and data storage which are slow to access but offer higher memory capacity. Primary memory stored on secondary memory is called "virtual memory".

Characteristics

Volatile memory

Volatile memory is a type of storage whose contents are erased when the system's power is turned off or interrupted. For example, RAM is volatile; meaning users will lose a document if they do not save their work to a non-volatile classification of memory, such as a hard drive, before shutting down the computer.

Non-volatile

Non-volatile is a term used to describe any memory or storage that is saved regardless if the power to the computer is on or off. The best example of non-volatile memory and storage is a computer hard drive, flash memory, and ROM. If data is stored on a hard drive, it will remain on that drive regardless if the power is interrupted, which is why it is the best place to store your data and documents. This is also how your computer keeps the time and other system settings even when the power is off.

Hamming Code

Data Error

Data error is term which occurs when we send data and it’s not received as we send.

Error Type

There are two type of error single bit and multiple bits (Burst)

Error detection and Correction

Error detection technique are user detect an error on the other hand error correction technique enable us to resolve an error. We can remove one, two and three bit error only because burst error may occur extremely.

Hamming code

Hamming code is a set of error-correction code s that can be used to detect and correct bit errors that can occur when computer data is moved or stored. Hamming code is named for R. W. Hamming of Bell Labs.

New Exam Pattern for UGC NET for Dec 2014

After UGC's failure, CBSE to conduct NET

NEW DELHI: Central Board of Secondary Education, the country's largest exam conducting body, is all set to add another test to its bouquet, the National Eligibility Test. The inclusion of the test from this year will make the board the biggest exam conducting body, with the number of CBSE candidates set to cross 65 lakh in a year.

After failing to conduct the test without hiccups, the University Grants Commission, with the HRD ministry's consent, has asked the CBSE to conduct the test. The decision was taken at the full commission meeting on Tuesday with near unanimity. The NET is conducted twice a year for grant of junior research fellowship and eligibility for assistant professor in institutions of higher learning.

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