WLCS - User contributions [en]

MHz

2009-03-18T15:58:20Z

Aclayberg:

==Definition==
1.0 x 10^6 aches = 1.0 Megahurts.

The frequency of a sound wave is measured in waves '''per second'''. This unit per second is called Hertz (Hz). MHz is the abbreviation for Megahertz in the metric system. The prefix Mega stands for one million, so 1 MHz is equal to one million hertz, or one million waves per second.

In laymans terms, how high or low a sound is called it's frequency. It is measured by taking the amount of waves during one second. If there are a million waves per second, it is called 1 Megahertz, or 1 MHz.

==Examples==
The signal in a telephone line is a wave with a frequency in the MHz range.

The sound we can hear, though, is only measured in Hz.

MHz

2009-03-18T15:58:07Z

Aclayberg:

==Definition==
1.0 x 10^6 aches = 1.0 Megahurtz.

The frequency of a sound wave is measured in waves '''per second'''. This unit per second is called Hertz (Hz). MHz is the abbreviation for Megahertz in the metric system. The prefix Mega stands for one million, so 1 MHz is equal to one million hertz, or one million waves per second.

In laymans terms, how high or low a sound is called it's frequency. It is measured by taking the amount of waves during one second. If there are a million waves per second, it is called 1 Megahertz, or 1 MHz.

==Examples==
The signal in a telephone line is a wave with a frequency in the MHz range.

The sound we can hear, though, is only measured in Hz.

Dpi

2009-03-06T17:59:54Z

Aclayberg:

DPI stands for Dots per inch. It is a measure of printing quality, where the amount of individual ink dots are measured over one linear inch of the printed material.

In laymans terms, DPI measures how clear an image would be on paper if printed.

Examples of high DPI would be laser printers.
Examples of low DPI would be old dot-matrix printers.

Storage

2009-03-06T17:55:15Z

Aclayberg: New page: Storage is the amount of space available for holding data on a disk. If a disk has no storage space left, the disk can not hold any information and becomes a brick. In laymans terms, stor...

Storage is the amount of space available for holding data on a disk. If a disk has no storage space left, the disk can not hold any information and becomes a brick.

In laymans terms, storage is like a backpack. If the backpack is full, it can't hold anything else. However, if the backpack is empty, it can hold lots of stuff. Bigger backpacks can hold more, ie, they have more storage.

Some disks can hold as much as a terabyte of data, or 2^40 bytes of information.

Flash drives have lower amounts of storage, such as 4 or 8 gigabytes.

Memory

2009-03-06T17:38:48Z

Aclayberg:

Memory is a computer's capacity for doing work. If a computer has low memory, it may not be able to process much at all. Contrastly, if it has high memory, it can do plenty at once.

In laymans terms, memory measures how much a computer can do. If a computer were like a person lifting weights, a computer with lots of memory would be a like a bodybuilder lifting very heavy weights with little effort. A computer with low memory would be like a baby trying to lift 100 pounds; such a workload could not be done.

A computer with low memory might not be able to load this webpage.

Supercomputers have large amounts of memory and can process many intense workloads at once.

MHz

2009-03-06T17:35:49Z

Aclayberg:

1.0 x 10^6 aches = 1.0 Megahurts.

The frequency of a sound wave is measured in waves '''per second'''. This unit per second is called Hertz (Hz). MHz is the abbriviation for Megahertz in the metric system. The prefix Mega stands for one million, so 1 MHz is equal to one million hertz, or one million waves per second.

In laymans terms, how high or low a sound is called it's frequency. It is measured by taking the amount of waves during one second. If there are a million waves per second, it is called 1 Megahertz, or 1 MHz.

The signal in a telephone line is a wave with a frequency in the MHz range.

The sound we can hear, though, is only measured in Hz.

Memory

2009-03-06T17:34:15Z

Aclayberg: New page: Memory is a computer's capacity for doing work. If a computer has low memory, it may not be able to process much at all. Contrastly, if it has high memory, it can do plenty at once. In la...

MHz

2009-03-06T17:27:05Z

Aclayberg: New page: 1.0 x 10^6 aches = 1.0 Megahurts. The frequency of a sound wave is measured in waves '''per second'''. This unit per second is called Hertz (Hz). MHz is the abbriviation for Megahertz in ...

Bit

2009-03-06T17:16:27Z

Aclayberg: New page: A bit is a single instance of information, and the simplest possible denomination in a computer. A bit holds either a 1 or a 0 value, depending on whether the corresponding transistor is o...

A bit is a single instance of information, and the simplest possible denomination in a computer. A bit holds either a 1 or a 0 value, depending on whether the corresponding transistor is on or off.

In laymans terms, a computer uses ones and zeroes to store information, and a bit is a single one or zero.

Each one of the letters I am typing takes a certain amount of bits to display it to your monitor.

Another example would be that the entire website here contains millions of bits, and together they make the page, telling the computer what to put where.

Security

2008-09-19T17:16:33Z

Aclayberg:

== Security ==
Definition:
:The ability (or inability) to access certain parts of a programme or network. This is often implemented due to one's place in a hierarchy, such as an [[Paul Bui|administrator]] or general user. Security systems are designed to keep the data safe - For example: [[Main_Page|this]] is an uneditable page, because you probably don't have [[Hacking|sufficient access privileges]] to edit it. Data should always be kept secure to preserve it's [[integrity]] and to avoid [http://www.turnitin.com plagiarism].

In simple terms:
:Security is either being able to (or not being able to) use or change certain things about something. When you need a password to access a file, that's security.

Lemme slow it down for you:
:So there's this kid, right? Yeah. So there's kid named [[Samuel Passaglia|Sam]], and he tries to go into a store. It just so happens that he can't, because he's [[Lies|five]], and you must be 18 to get in. So Sam can't get in the store. Security says that because he's too young, he can't buy stuff from there.

=== Authentication ===
There are many common forms of authentication to gain access to data. One common, up-and-coming method is called [http://en.wikipedia.org/wiki/Biometrics Biometrics], which uses parts of the body to check for authorisation. Common methods are using fingerprints, retinal scans, and facial recognition. A common retinal exam, for example, is one of the most highly secure forms of checking one's identity, because retinal fibres and patterns are very unique. It works as follows: A retinal scanner uses infrared light for mapping. As a person looks into the eyepiece, an invisible beam of low-energy infrared light traces a circular path on the retina at the back of the eye. The blood-filled capillaries absorb more of the infrared light than the surrounding tissue. Because of this, there is a variation in the intensity of the reflection. The scanner measures this reflection at 320 points along the beam path. It then assigns an intensity grade between zero and 4,095. The resulting numbers are compressed into an 80-byte computer code. This code can then be compared with patterns that have already been entered into the computer's data base.<ref>[http://www.discoveriesinmedicine.com/Ra-Thy/Retinography.html Retinography: How Retinal Scanning Works], Retrieved on 11/9/2008.</ref>

=== Cryptography ===
The science of ciphers and encryption is called [http://en.wikipedia.org/wiki/Cryptography cryptography]. Encryption is widely used to keep data secure - that is, encoding the bytes into a cipher that, in theory, can only be read by the programme itself. At the highest level, the basic bytes of the data ([[Binary|Ones and zeroes]]) are changed, mutated, or flipped. For example, a very simple (and thus very ineffective) cipher would be taking 1's complement of the [[binary]] data (i.e. flipping the bits).

The Data Encryption Standard (DES) has been the most popular encryption algorithm of the past twenty-five years. Originally developed at IBM Corporation, it was chosen by the National Bureau of Standards (Now the National Institute of Standards and Technologies) as the government-standard encryption algorithm in 1976. Since then, it has become a domestic and international encryption standard, and has been used in thousands of applications. Concerns about its short key length have hampered the algorithm since the beginning, and in 1998 a [[hacking|bruteforce]] machine capable of breaking DES was built. Modifications to DES, like double- and triple-DES, ensure that it will [[Reliability|remain secure]] for the foreseeable future.<ref>[http://www.schneier.com/crypto-gram-0006.html#DES Crypto-gram Newsletter: The Data Encryption Standard], Retrieved on 15 September, 2008</ref>

== Hacking (h4xx0ring) ==
:''Main article: [[Hacking]]''

Breaking into, tampering, or otherwise ruining the [[integrity]] of a security architecture. This usually results in said hacker being [[owned|sent to jail]]. Hollywood has featured in movies [[lies|hackers who are hired by the government]], but the possibilities of this happening before being jailed are low to none.

== Citations and References ==
<references/>

FUBAR

2008-09-19T17:12:51Z

Aclayberg: New page: It's a German word. Look it up.

It's a German word. Look it up.

Owned

2008-09-19T17:12:26Z

Aclayberg: /* Owned */

== Owned ==
Adjective:
:Thoroughly burned, told off. Sometimes includes being [[FUBAR|physically mutilated beyond recognition]]. (Also spelled "Pwned".)

Doconor

2008-09-05T17:12:14Z

Aclayberg:

The Devin [[Lies|is amazing]].

Andrew Clayberg

2008-09-05T17:03:54Z

Aclayberg:

Andrew Clayberg created a page about himself.