ict living in a digital world notes

Created by: rose 1212
Created on: 22-03-14 20:49

View mindmap

ICT CHAPTER 1
- Designing a mobile phone
  - GPS
    - Navigational system, used in many devices- gives current location/ directions from current location
    - distance current location 2 specified location using signals from satellites
  - Assisted GPS- technology that has been built into mobile phones. when signal between mobile + satellite= weak, signal sent by mobile phone- diverted 2 mobile masts which identify phones exact location
  - User interface- the way a user interacts with a system like computer/ determines how commands are given to computer
    - Menus: user chooses the commands from lists displayed on the screen.
    - GUI (Graphical user interface) e.g. windows- user gives command by selecting icons displayed on screen
    - Command line- used by specialists involves codes
- What can your phone do?
  - Features of a mobile phone
    - Camcorder
    - Loadspeaker
    - Touch screen
    - MP3 player
    - WiFi
    - Bluetooth
    - Video calling
    - Internal memory
    - Hands- free device
    - GPS
    - Games
    - Alarm
    - Personal organiser
    - Roaming
    - USB port
    - Internet
    - Network band
    - SMS
    - Memory card
    - Voice recorder
    - Predictive text
    - Email
    - Memo
    - Radio
    - 3G
    - Calculator
    - Untitled
    - MMS
  - Choosing a phone
    - Picture resolution
      - quality and detail of screen of mobile. higher the resolution, better the quality. measured in pixels
    - Camera resolution
      - amount of detail camera picks up in 1 picture. higher resolution, more detail camera picks up, measured in mega pixels
    - A mobile phone
      - Memory card- secondary storage device/ allows users to store, back up, remove files measured in giga bytes
      - Music player- saved as MP3 and WAV
      - storage capacity- amount of space phone has in its internal memory
      - Video files- stored as MP4, 3GP, AVI,
      - Connectivity
        WiFi
        similiar to bluetooth, used to exchange data but signal can travel further distance
        
        Bluetooth
        allows exchange of data over short distances
        
        to connect to the internet mobile needs 2 receive/ send signals/ needs to connect wirelessly
      - Network band
        Dual band- picks up 2 frequences
        
        tri band- picking up 3 frequences
        
        quad band- picking up 4 frequences
  - It is Malfunctional
    - ability to do different things using same device
  - Mobile phones for everyone
    - cons of mobile phones
      - Texting too much can lead to repetitive strain injury (RSI)
      - young people can be victims of bullying/ crime if targeted for their phone
      - mobiles phones not been around for too long, so scientists unsure of risks associated with using them
        As a precautionary, government health advisers recommend that children under 16 should not use mobile phones regularly.
      - Overuse of 'text speak' can have impact to spell words properly
    - Etiquette (rules), mobile safety advice
      - mobile phones= expensive/ easy target for thieves- should activate lock feature that requires pin
      - Recycle old phones
      - Avoid using mobile phone in quiet area e.g. quiet coaches, trains + libraries
      - when driving a car- illegal to talk on phone without hands- free kit
      - Activate keypad lock to prevent accidental emergency calls being made
      - After taking photo/ video of someone on phone- ask their permission before uploading it to a public domain
      - On internet- avoid viewing content- unsuitable for your age
      - Don't send malicious messages/ make prank calls- lead to police charging you with harassment
- points to consider when designing phone at elderly people
  - navigation or menu system
  - number of features available
  - Weight of phone
  - Volume of capacity of speakers
  - Size of screen and buttons
  - Panic button to reach relatives easily
  - interface
- What kind of computer?
  - Laptop
    - portable computer/ carries out same functions as desktop computers but in compact version that is light to carry around.
  - Netbook
    - Similar to notebook/ designed mainly for wireless communication via email/ messaging + access to internet. Usually cheaper/ lower specification compared to laptops/ notebooks+ have solid state memory
  - Personal digital assistant (PDA)
    - Portable device- small enough to carry in palm of hand. Contains- note-making features/ telephone, internet facilities/ allows data to be exchanged with computers
  - Notebook
    - Similar to laptop but more compact
  - Things to consider when buying computer, laptop, net book, notebook
    - Storage capacity- the more you have the more files you can store
    - Processor speed- the quicker it is , the faster your device will work
    - Amount of RAM- the more RAM it has, the more applications it will be able to support
      - RAM- temporary memory/ used to run programs already opened- higher- the more programs can be opened + they will respond. If power fails, unsaved work will be lost/ graphics and videos require more RAM.
    - Battery life (portable device)- how long will the power last
    - Considering the following features when buying computer
      - WIRELESS ENABLED- allows device to pick up WiFi signals/ enable you to connect to network/ connect devices/ access internet without wires
        Date exchanged wirelessly slower than travelling through cables
        Data can be distorted as it travels through air by other signals+ interference's.
      - Sound card/Graphics card- devices to fix computers main circuit/ allowing computer to play/ record sound + display graphics
      - Hard drive size= primary storage area of computer/ where software, files + data kept and retrieved from/ measured in gigabytes- bigger the hard drive/ the more data can be stored
      - USB connection (universal serial bus)- common method of connecting devices to computer/ if computer has more then 1- many peripherals can use this connection
      - Processor (CPU)- brains of computer- does the calculating/ number of calculations (processes)measured in GHz/ higher the processing speed- faster computer- but the more power it uses
      - Optical Drive- uses laser to read data encoded on CD's and DVD's/ allows you to install software, listen to music + watch films/ some optical drives allow CD/DVD to be written (burned)-useful if transferring information from the device.
- Peripheral devices
  - Output
    - Projector
    - Printer
    - Speakers
    - Head phones
  - Input
    - Scanner
    - Mouse
    - Keyboard
    - Webcam
  - Storage devices
    - External HD
    - USB
  - Future proofing
    - Untitled
      - when buying something making sure it is for long term high spec and will not go out of date quickly.