Pervasive Computing

    

    Pervasive computing (also called ubiquitous computing) is the growing trend towards embedding microprocessorsin everyday objects so they can communicate information. The words pervasive and ubiquitous mean "existing everywhere." Pervasive computing devices are completely connected and constantly available.
Pervasive computing relies on the convergence of wirelesstechnologies, advanced electronics and the Internet. The goal of researchers working in pervasive computing is to create smart products that communicate unobtrusively. The products are connected to the Internet and the data they generate is easily available.
   
    Privacy advocates are concerned about the "big brother is watching you" aspects of pervasive computing, but from a practical standpoint, most researchers feel it will improve efficiency. In a 1996 speech, Rick Belluzo, who was then executive VP and general manager of Hewlett-Packard, compared pervasive computing to electricity. He described it as being "the stage when we take computing for granted. We only notice its absence, rather than its presence."
    
    An example of a practical application of pervasive computing is the replacement of old electric meters with smart meters. In the past, electric meters had to be manually read by a company representative. Smart meters report usage in real-time over the Internet. They will also notify the power company when there is an outage, reset thermostats according to the homeowner's directives, send messages to display units in the home and regulate the water heater.

Computer Systems

INPUT


Any data and instructions entered into the memory of a computer.There are 4 types of input which are text,graphics,audio and video.
ex: Keyboard,mouse,microphone etc.

PROCESS


CPU or Central Processing Unit/Processor/Microprocessor is an electronic component on a computer's motherboard that interprets and carries out the basic instructions that operate the computer.
ex:G4 Mac etc.


OUTPUT


The result  raw input data that has been processed by the central processing unit (CPU) into meaningful information.
ex:Speaker,monitor,printer etc.

STORAGE


A location in which data,instructions and information are saved for future use.
ex:CD ROM,diskette,hard disk etc.