Write a note on secondary storage

1 answer:

8 0

Answer: Storage devices are non-volatile devices. That means that when the power is removed from them, for example, when you switch your computer off, they retain their contents (unlike RAM, which is volatile – it loses its contents). You can then retrieve the contents next time you switch your computer on. Storage devices can be used to hold operating systems, applications and files, amongst other types of software. They are simply big suitcases – used only for storage. We have already seen that when you want to use an application kept on a storage device, it has to be moved to RAM before you can start using it. This applies to the operating system, your files and any other category of software. For this reason, RAM is sometimes known as Primary Memory whereas storage devices are often referred to as Secondary Storage devices.

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A domestic air carrier airplane lands at an intermediate airport at 1815Z. The latest time it may depart without a specific auth

serious [3.7K]

Answer:

A domestic air carrier airplane lands at an intermediate airport at 1815Z. The latest time it may depart without a specific authorization from an aircraft dispatcher is 1915Z (1 hour).

Explanation:

Under the domestic operations, an airplane landed on intermediate airport can remain their for not more than one hour so the time would me 1 hour.

Here the time represented by 1815Z and 1915Z is in Zulu Time Zone as depicted from letter "Z". The first two digits represent the hour (0-24) and the next two represent the minutes (0-59).

Here the landing time is 6:15 pm while departing time is after one hour that is 7:15 pm (1915Z).

i hope it will help you.

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3 years ago

There are generally two ways of implementing dynamic programming solutions to problems, which have equal asymptotic time complex

san4es73 [151]

Answer:

1) Bottom-up

2) Top-down

Explanation:

In general dynamic programming is a divide and conquer strategy which can be implemented using bottom up approach or top down approach.

Bottom-up approach in dynamic programming will solve a relatively simple sub-problem first and then use the solution to build and arrive at solutions to a bigger sub-problem.

Top down approach is reversed to bottom-up approach and is also known as Memoization Method. Instead of solving a problem started from the base state sub-problem, the top down approach break a problem into a smaller problems from the top most destination state until it reaches the bottom most base state.

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3 years ago

Differences between barcode reader and character recognition devices

spin [16.1K]

Differences between barcode reader and character recognition devices:

Barcode Reader or Barcode Scanner:

Barcode Scanner scans the data by brightening the barcodes usingSensor
The analog signal is then converted into digital signal by Converter.
The Decoder calculates the converted data and sends valid data to the computer.

Character Recognition Devices (OCR):

OCR scans the physical document and converts them into two-coloured format.
The darker and lighter area are identified as characters and blanks respectively.
The common methods used are: Pattern Recognition and Feature Detection.