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Wednesday, May 6, 2009

a touching story....


I was walking around in a Target store, when I saw a Cashier hand this little boy some money back.
The boy couldn't have been more than 5 or 6 years old.
The Cashier said, 'I'm sorry, but you don't have enough money to buy this doll.'
Then the little boy turned to the old woman next to him: ''Granny,
are you sure I don't have enough money?''
The old lady replied: ''You know that you don't have enough money to buy this doll, my dear.''
Then she asked him to stay there for just 5 minutes while she went to look a round. She left quickly.
The little boy was still holding the doll in his hand.
Finally, I walked toward him and I asked him who he wished to give this doll to.
'It's the doll that my sister loved most and wanted so much for Christmas.
She was sure that Santa Claus would bring it to her.'
I replied to him that maybe Santa Claus would bring it to her after all, and not to worry.
But he replied to me sadly. 'No, Santa Claus can't bring it to her where she is now. I have to give the doll to my mommy so that she can give it to my sister when she goes there.'
His eyes were so sad while saying this. 'My Sister has gone to be with God. Daddy says that Mommy is going to see God very soon too, so I thought that she could take the doll with her to give it to my sister.''
My heart nearly stopped.
The little boy looked up at me and said: 'I told daddy to tell mommy not to go yet. I need her to wait until I come back from the mall.'
Then he showed me a very nice photo of him where he was laughing. He then told me 'I want mommy to take my picture with her so she won't forget me.'
'I love my mommy and I wish she doesn't have to leave me, but daddy says that she has to go to be with my little sister.'
Then he looked again at the doll with sad eyes, very quietly.
I quickly reached for my wallet and said to the boy. 'Suppose we check
again, just in case you do have enough money for the doll?''
'OK' he said, 'I hope I do have enough.' I added some of my money to his with out him seeing and we started to count it. There was enough for the doll and even some spare money.
The little boy said: 'Thank you God for giving me enough money!'
Then he looked at me and added, 'I asked last night before I went to sleep for God to make sure I had enough money to buy this doll, so that mommy could give It to my sister. He heard me!''
'I also wanted to have enough money to buy a white rose for my mommy, but I didn't dare to ask God for too much. But He gave me enough to buy the doll and a white rose.''
'My momm y loves white roses.'
A few minutes later, the old lady returned and I left with my basket.
I finished my shopping in a totally different state from when I started.
I couldn't get the little boy out of my mind.
Then I remembered a local news paper article two days ago, which mentioned a drunk man in a truck, who hit a car occupied by a young
woman and a little girl.
The little girl died right away, and the mother was left in a critical
state. The family had to decide whether to pull the plug on the
life-sustaining machine, because the young woman would not be able to recover from the coma.
Was this the family of the little boy?
Two days after this encounter with the little boy, I read in the news paper that the young woman had passed away.
I couldn't stop myself as I bought a bunch of white roses and I went to the funeral home where the body o f the young woman was exposed for people to see and make last wishes before her burial.
She was there, in her coffin, holding a beautiful white rose in her hand with the photo of the little boy and the doll placed over her chest.
I left the place, teary-eyed, feeling that my life had been changed for ever.. The love that the little boy had for his mother and his sister is
still, to this day, hard to imagine.
And in a fraction of a second, a drunk driver had taken all this away from him.
The value of a man or woman resides in what he or she gives, not in what they are capable of receiving

letz we learn about internet protocol....




The Internet Protocol (IP) is a protocol used for communicating data across a packet-switched internetwork using the TCP/IP suite of protocols.
IP is the primary protocol in the Internet Layer of the Internet protocol suite and has the task of delivering datagrams (packets) from the source host to the destination host solely based on its address. For this purpose the Internet Protocol defines addressing methods and structures for datagram encapsulation.
TCP/IP

1. The Internet Protocol suite or TCP/IP is the set of communications protocols used for the Internet and other similar networks. It is named from two of the most important protocols in it: the Transmission Control Protocol (TCP) and the Internet Protocol (IP), which were the first two networking protocols defined in this standard. Today's IP networking represents a synthesis of several developments that began to evolve in the 1960s and 1970s, namely the Internet and LANs (Local Area Networks), which, together with the invention of the World Wide Web by Sir Tim Berners-Lee in 1989, have revolutionized computing.
2. The Internet Protocol suite—like many protocol suites—can be viewed as a set of layers. Each layer solves a set of problems involving the transmission of data, and provides a well-defined service to the upper layer protocols based on using services from some lower layers. Upper layers are logically closer to the user and deal with more abstract data, relying on lower layer protocols to translate data into forms that can eventually be physically transmitted.

Intranet
1. An intranet is a private computer network that uses Internet protocols and network connectivity to securely share part of an organization's information or operations with its employees. The same concepts and technologies of the Internet such as clients and servers running on the Internet protocol suite are used to build an intranet. There is often an attempt to use Internet technologies to provide new interfaces with corporate "legacy" data and information systems.
2. Briefly, an intranet can be understand as a private version of the Internet, or as a version of the Internet confined to an organization.An IntranetSite differs from a website in the fact that websites are oriented to public web browsers that do not need be authenticated in order to view the content. The IntranetSite content is private and does require authentication for each web viewer.
Extranet
1. An extranet is a private network that uses Internet protocols, network connectivity, and possibly the public telecommunication system to securely share part of an organization's information. An extranet can be viewed as part of a company's Intranet that is extended to users outside the company. It has also been described as a "state of mind" in which the Internet is perceived as a way to do business with a preapproved set of other companies business-to-business (B2B), in isolation from all other Internet users. In contrast, business-to-consumer (B2C) involves known server(s) of one or more companies.
2. Briefly, an extranet can be understand as a private intranet mapped onto the Internet or some other transmission system not accessible to the general public, but is managed by more than one company's administrator(s).Any private network mapped onto a public one is a virtual private network (VPN). In contrast, an intranet is a VPN under the control of a single company's administrator(s).
Internet
1. The Internet is a global system of interconnected computer networks that interchange data by packet switching using the standardized Internet Protocol (IP) Suite. It is a "network of networks" that consists of millions of private and public, academic, business, and government networks of local to global scope that are linked by copper wires, fiber-optic cables, wireless connections, and other technologies.
2. The Internet carries various information resources and services, such as electronic mail, online chat, file transfer and file sharing, online gaming, and the inter-linked hypertext documents and other resources of the World Wide Web (WWW).

Tuesday, May 5, 2009

COMPUTER GENERATIONS


First Generation ( 1946 - 1958 )

The first generation computers were huge, slow, expensive, and often undependable. In 1946two Americans, Presper Eckert, and John Mauchly built the ENIAC electronic computer which used vacuum tubes instead of the mechanical switches of the Mark I. The ENIAC used thousands of vacuum tubes, which took up a lot of space and gave off a great deal of heat just like light bulbs do. The ENIAC led to other vacuum tube type computers like the EDVAC (Electronic Discrete Variable Automatic Computer) and the UNIVAC I (UNIVersal Automatic Computer). The ENIAC gave off so much heat that they had to be cooled by gigantic air conditioners. However even with these huge coolers, vacuum tubes still overheated regularly.


Second Generations ( 1959 - 1964
)
In 1947 three scientists, John Bardeen, William Shockley, and Walter Brattain working at AT&T's Bell Labs invented what would replace the vacuum tube forever. This invention was the transistor which functions like a vacuum tube in that it can be used to relay and switch electronic signals. There were obvious differences between the transistor and the vacuum tube. The transistor was faster, more reliable, smaller, and much cheaper to build than a vacuum tube. One transistor replaced the equivalent of 40 vacuum tubes. These transistors were made of solid material, some of which is silicon, an abundant element (second only to oxygen) found in beach sand and glass. Therefore they were very cheap to produce. Transistors were found to conduct electricity faster and better than vacuum tubes. They were also much smaller and gave off virtually no heat compared to vacuum tubes.


Third Generations ( 1965 - 1970 )

Transistors were a tremendous breakthrough in advancing the computer. However no one could predict that thousands even now millions of transistors (circuits) could be compacted in such a small space. The integrated circuit, or as it is sometimes referred to as semiconductor chip, packs a huge number of transistors onto a single wafer of silicon. Robert Noyce of Fairchild Corporation and Jack Kilby of Texas Instruments independently discovered the amazing attributes of integrated circuits. Placing such large numbers of transistors on a single chip vastly increased the power of a single computer and lowered its cost considerably.

Since the invention of integrated circuits, the number of transistors that can be placed on a single chip has doubled every two years, shrinking both the size and cost of computers even further and further enhancing its power.

These third generation computers could carry out instructions in billionths of a second. The size of these machines dropped to the size of small file cabinets. Yet, the single biggest advancement in the computer era was yet to be discovered.



Fourth Generations ( 1971 - now )
This generation can be characterized by both the jump to monolithic integrated circuits(millions of transistors put onto one integrated circuit chip) and the invention of the microprocessor (a single chip that could do all the processing of a full-scale computer). By putting millions of transistors onto one single chip more calculation and faster speeds could be reached by computers. Because electricity travels about a foot in a billionth of a second, the smaller the distance the greater the speed of computers.
However what really triggered the tremendous growth of computers and its significant impact on our lives is the invention of the microprocessor. Ted Hoff, employed by Intel (Robert Noyce's new company) invented a chip the size of a pencil eraser that could do all the computing and logic work of a computer. The microprocessor was made to be used in calculators, not computers. It led, however, to the invention of personal computers, or microcomputers. Today we have all heard of Intel and its Pentium® Processors and now we know how it all got started. The computers of the next generation will have millions upon millions of transistors on one chip and will perform over a billion calculations in a single second. There is no end in sight for the computer movement.


Fifth Generation(Present and beyond)

The fifth generation computers are technologically advance and are still being development to become more efficient.

The inventions of new hardware technology in the fifth generation have grown rapidly including many other modern computer devices such as :
• silicone chips
• processor
• robotics
• virtual reality
• intelligent systems
• programs which translate languages