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Thursday, May 7, 2009

Embedded Systems



Embedded Systems

What is it?

Embedded systems refer to devices, instruments or large engineering structures/systems that are built to handle one or a few pre-established tasks. The computer controlling the whole thing is built into or 'embedded' within the device.


Characteristic?

The key characteristic of an embedded system is that it is supposed to handle a few simple tasks, although the steps involved in handling or accomplishing that task may be as complex as any computer program.


Examples?

Cellphones and personal digital assistants (PDAs) are examples of devices with embedded systems. They both perform a specific number of tasks which are controlled by a built-in computer system.

Inertial guidance systems used for aerial navigation or as part of the guidance package of smart bombs and missiles are examples of instruments with embedded systems.
A traffic control system (which remotely controls traffic lights without the need for human intervention) is an example of a large engineering structure with an embedded system.
In truth, the line between 'embedded' systems and general purpose systems (which may or may not contain an embedded system) is becoming blurred as technology progresses.

Friday, May 1, 2009

Meaning of e-Bay

What is eBay?
Definition
eBay is the world's online marketplace; a place for buyers and sellers to come together and trade almost anything.


How does eBay works?
A seller lists an item on eBay, most anything from antiques to cars, books to sporting goods. The seller chooses to accept only bids for the item (an auction-type listing) or to offer the Buy It Now option, which allows buyers to purchase the item right away at a fixed price.

  • In an online auction, the bidding opens at a price the seller specifies and remains on eBay for a certain number of days. Buyers then place bids on the item. When the listing ends, the buyer with the highest bid wins.

In a buy it now listing, the first buyer willing to pay the seller's price gets the item.