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2/24/2010

History of computer science

History of computer science - computer is generally defined as the study of both the computing, hardware (hardware) and software (the software). Computer science includes a variety of topics relating to computers, ranging from the abstract analysis of algorithms to more concrete subjects like programming languages, software, including hardware. As a discipline, Computer Science is more emphasis on computer programming, and software engineering (software), while the computer technique is more likely related to things like computer hardware (hardware). However, both terms are widely misunderstood by many people.

Church-Turing thesis states that all computing devices that have been commonly known fact the same in terms of what they can do, though with different efficiency. This thesis is sometimes regarded as the basic principles of computer science. Computer scientists usually emphasizes von Neumann computers or Turing machines (computers that do small tasks and deterministic at a certain time), because things like that most computers in use today. Computer scientists are also studying other types of machines, some of which can not be of practical use (such as neural computers, DNA computers, and quantum computers) and some are still quite theoretical (such as computers and computer random oracle).

Computer Science learn what can be done by several programs, and what is not (komputabilitas and artificial intelligence), how the program should evaluate the outcome (algorithm), how the program should store and retrieve bits of an information (data structures), and how to program and communicate the user (the user interface and programming language).

Computer science is rooted in electronics, mathematics and linguistics. In the last three decades of the 20th century, computer science has become a new discipline and has developed his own methods and terminology.

The first computer science department at Purdue University was founded in 1962. Almost all universities now have the computer science department.

The highest award in computer science is the Turing Award, the winner of this award are all pioneers in their fields.

Edsger Dijkstra said:

Computer science is not about computers as astronomy is not about the telescope

Renowned physicist Richard Feynman said:

Computer science is not as old as the age of physics; younger than a few hundred years. However, this does not mean that the "meal" computer scientist is much less than physicists. It is younger, but grew up in a much more intense!

2/17/2010

How to create a LAN

How to create a LAN - When my friend at home has more than one computer, and each computer connected to each other in order to share data, printers, Internet connection sharing, etc., we could do with a computer network LAN (Local Area Network) simple ..

the post, this time we use a cable connection that is using a data cable UTP (unshielded twisted pair), which is standard cable to the LAN network connection.
Computers are currently used in general has been equipped with a LAN Card or also known as NIC (Network Interface Controller), or Ethernet Card.



• If the number of computers that will connect only two, we are only enough to provide one with a length of UTP cable according to the distance between the computer at both ends of the cord has been fitted with RJ-45 connector (standard connector for UTP LAN cable) to the configuration Cross / cross.



• If the number of computers that will connect more than 2 pieces, then we must add a device called Switch or Hub. At this time the price of a switch to standard housing is very affordable.
Of each - each computer connected to the switch using UTP cable with RJ-45 connectors on both ends with a configuration Straight / straight.



Installation of connectors on UTP cable can be made yourself, but to simply stay mate just go to a computer store that also provides network equipment, and living told to buy a pair UTP cable connector all the configuration of cross / cross to connect the computer to the computer (two computers) , or straight / straight to connect more than 2 computer / use switch.

Configuring the IP address (Internet Protocol / TCP IP)
To be able to communicate with each other, respectively - each computer must be alamai IP

• Go to Network Connection (Start -> Control Panel -> Network Connection)
• Select / double-click Local Area Connection
• Double click on Internet Protocol (TCP / IP)
• Click Use the following IP address, and fill out an IP address and Subnet Mask
For example,
komputer1 IP Address: 192.168.0.1
komputer2 IP Address: 192.168.0.2
komputer3 IP Address: 192.168.0.3
komputer4 IP Address: 192.168.0.4
etc. ..
Must be the same Subnet Mask: 255.255.255.0



To determine success or failure of connection do the ping command from one computer to another computer
Example from komputer1 to komputer2:
• In Komputer1: Click Start -> Click Run -> type CMD -> click OK, then will appear Command Prompt
• Type in ping 192.168.0.2 hit enter
Reply from there must komputer2
• Perform the same command to find a connection to another computer.