QR Codes

A QR code is a set of black small squares placed on a big white square, in different ways, with three bigger squares at corners avoove and on the left. They are like an evolution of bar codes, but anybody can scan them with an smartphone and the appropiate application. They read information which can be a link to a webpage, a small text, an image...

This codes came from the car brand Denso Wave, from Toyota. They used them to mark their differents pieces to storage them (1994).

Their capacity is varialble because there are differents types of QR codes. But the normal capacity is 2953 MByte or 7089 numeric characters as maximum.

NETWORKS

Hello followers of the blog, I know that this post comes late but I hope you enjoy it.

    1.- What is it?

         It´s a set of devices conncted between them through wires, via wireless or mixed; some parts trough wires, some parts via wireless. You can use it to share data, services, information... 

It has different characteristics. For example, it's Peer to Peer (P2P) administrated if it's used betwen equal level users, or Client-Server administrated if someone controls the network and says who can see or use each shared datum or resource.

   

     2.- Topologies

          The topologies depend on the form you connect the computers to a wired net.

              - Bus topology.                                                     -Star topology.

                     

         
                  -Ring topology.                                                -Tree topology.
                            

       
              -Mesh topology.
  

     3.- Sizes of networks according to their area
          - PAN: Personal Area Network, like the network in a house
          - LAN: Local Area Network, like netkorks in business and buildings
          - MAN: Metropolitan Area Network, like a network in a country or region
          - WAN: Wide Area Network, like Internet, the biggest network

     4.- IP (Internet Protocol) adresses
          They are numerical adresses that comunicate computers through the Internet.
     They are formed by four numbers separeted by dots, which go from 0 to 255.
             -If they are represented by decimal numbers, they have three digits.
             -If they are represented by binarial numbers, they have eight digits.
     There are three classes of IP adresses: A, B, C.
             - A class: they go from 1.0.0.0 to 126.0.0.0; they can have 126 networks and 16777214 devices.
             - B class: they go from 128.0.0.0 to 191.0.0.0; they can have 16384 networks and 65534 devices.
             - C class: they go from 192.0.0.0 to 223.255.255.0; they can have 2097152 networks and 254 devices.

     5.- MAC adress
          It is a code which goes in a network card different in each computer, which the fabricant sets. They send information through a network cable: twisted pair cable or optical fiber cable.

     6.- Information controlers
          -Hub: connects different devices and sends information from one port to the others.
          -Switch: filtrates data and administrates conections.
          -Router: routs and sends information between networks.

Now I have understood better networks and I hope so you do.

PHUBBING

This word appeared in 2007 with the new smartphones.

The meaning of this word accords to when one person ignores the real world to be concentrated in the virtual world. Normal phones, smarphones, tablets... Are the usual technological gadgets in phubbing.

This word is a mix between phone and snubbing.

This word became famous because of the Stop Phubbing Campaign.

Selfie

Definition

A selfie is a type of photo that you take by yourself, you pose in front of a camera that you´re holding with one hand. You can find a selfie in blogs or social networks.

History

This word appeared for the first time on the forum of ABC online, it was used as a colloquial word. After that, this word started to appeared on social networks like MySpace or Facebook.