Tuesday, April 5, 2011

Privacy " FACEBOOK"

Reasons explaining the use of security in Facebook



  • Blocking/ monitoring net activity teaches students that trying to keep private is a bad thing and you should accept that someone needs to know what you are doing. 
  • Humans strive to get attention through Facebook and status updates, they want more comments to feel more wanted and socially stable.
  • We now feel comfortable telling the world everything
  • We don't care who reads or what their comments say as long as they commented
  • These comments drive us to tell the world more
  •  School Net security systems contradict their own existence by selling info to companies and dictatorships

Thursday, March 31, 2011

Why Should We Back Up?

The following reason is why we backup so in case the data or file becomes corrupted or accidentally deleted, we have a backup.

Media and Storage Devices

The Use of Backing Storage at Kings College

  • Fixed hard discs- Used in every computer in the school
  • Portable hard discs- Used to store large files
  • Magnetic tape- Uses serial access for reading and writing.  Used for backups of file servers for computer networks. Optical backing storage media such as CDs and DVD and is quite cheap for backing up files at King's.
  • Optical backing storage media such as CDs and DVD-CDs tend to be used for large files (but smaller than 1Gb) which are too big for a floppy disc to hold such as music and general animation.  DVDs are used to hold very large files (several Gb) such as films at school.
  • CD ROM/DVD ROM-Applications which require the prevention of deletion of data, accidental or otherwise for students.
  • CD R/DVD- Applications which require a single burning of data, e.g. CDs Z recording of music downloads from the internet, recording of music from MP3 format, recording of data for archiving or backup purposes at King's.
  • CD RW/DVD RW-Applications which require the updating of information and ability to record over old data at King's.
  • DVD RAM- Same properties as DVD RW but quicker access and data can be overwritten more easily. 
  • Blu-ray-Capacities of 25Gb, 50Gb and 100 Gb.  Used for storing films (movies). 25Gb equates to 2 hrs HDTV, 13hrs standard definition TV
  • Solid state backing storage-Smallest form of memory, used as removable storage at school.  More robust than other forms of storage. 
  • Memory sticks/Pen drive-Used at Kings to transport small files conveniently.
  • Flash memory cards-Used in digital cameras, palmtops, mobile phones, MP3 players at Kings
As I was away I would like to acknowledge my source: Robert Sheetz

Monday, March 21, 2011

Access Steps

Steps for access
Step 1: Open Microsoft Access and create a database according to exam name
Step 2: Click "Eternal Data", then select "Text File"
Step 3: Change 2 to 4
Step 4: Browse for file
Step 5: Right click on the correct table and select "Design View"
Step 6: Change categories according to instructions
Step 7: Continue
Step 8: Double click your table

Monday, March 14, 2011

Types and components of computer systems

Candidates should be able to:

(a) define hardware, giving examples

(b) define software, giving examples

(c) describe the difference between hardware and software

(d)  identify the main components of a general-purpose computer: central processing unit, main/internal
memory (including ROM and RAM), input devices, output devices and secondary/backing storage

(e)  identify operating systems, including those which contain a graphical user interface, a command line
interface

(f)  identify different types of computer including Personal Computer or desktop, mainframe, laptop, palmtop
and Personal Digital Assistant

(g) describe recent developments in ICT

Storage devices and media

Magnetic backing storage media

Fixed hard discs
Used to store operating systems, software and working data.  Any
application which requires very fast access to data for both reading and
writing to.  Not for applications which need portability.  Used for online
and real time processes requiring direct access.  Used in file servers
for computer networks

Portable hard discs
Used to store very large files which need transporting from one
computer to another and price is not an issue.  More expensive than
other forms of removable media

Magnetic tapes
Any application which requires extremely large storage capacity and
speed of access is not an issue.  Uses serial access for reading and
writing.  Used for backups of file servers for computer networks.  Used
in a variety of batch processing applications such as reading of bank
cheques, payroll processing and general stock control


Optical backing storage media 
such as CDs and DVDs
CDs tend to be used for large files (but smaller than 1Gb) which are
too big for a floppy disc to hold such as music and general animation.
DVDs are used to hold very large files (several Gb) such as films.  Both
CDs and DVDs are portable i.e. they can be transported from one
computer to another.  Both can be used to store computer data.

CD ROM/DVD ROM
Applications which require the prevention of deletion of data,
accidental or otherwise.  CDs used by software companies for
distributing software programs and data; by music companies for
distributing music albums and by book publishers for distributing
encyclopaedias, reference books etc.  DVDs used by film distributors

CD R/DVD R 
Applications which require a single eburningf of data, e.g. CDs Z
recording of music downloads from the internet, recording of music
from MP3 format, recording of data for archiving or backup purposes.
DVDs Z recording of films and television programs

CD RW/DVD RW 
Applications which require the updating of information and ability to
record over old data.  Not suitable for music recording but is very
useful for keeping generations of files.  DVDs have between five and
ten times the capacity of CDs

DVD RAM 
Same properties as DVD RW but quicker access and data can be
overwritten more easily.  Similar to floppies in nature but has 3000Z
6000 times more storage and uses optical technology

Blu-ray 
Capacities of 25Gb, 50Gb and 100 Gb.  Used for storing films (movies).
25Gb equates to 2 hrs HDTV, 13hrs standard definition TV.  It is
possible to playback video on a disc while simultaneously recording HD
video.  (Will be) used for storage of PC data

Solid state backing storage 
Smallest form of memory, used as removable storage.  More robust
than other forms of storage.  More expensive than other forms, but
can be easily written to and updated

Memory sticks/Pen drives
Can store up to many Gb.
Used to transport files and backup data  from computer to computer

Flash memory cards
Used in digital cameras, palmtops, mobile phones, MP3 players

Sensors (general) in control and measuring applications

Temperature sensor
Automatic washing machines, automatic cookers, central heating
controllers, computer-controlled greenhouses, scientific experiments
and environmental monitoring

Pressure sensor
Burglar alarms, automatic washing machines, robotics, production line
control, scientific experiments and environmental monitoring

Light sensor
Computer controlled greenhouses, burglar alarm systems, robotics,
production line control, scientific experiments and environmental
monitoring

Graphics tablet
Inputting freehand drawings or retouch photographs

Optical Mark Reader
Inputting pencil marks on a form such as a school register, candidate
exam answers, any application involving input of a choice of options

Optical Character Reader
Inputting text to a computer ready for processing by another software
package such as word processors, spreadsheets, databases etc.

Bar code Reader
Inputting code numbers from products at a POS terminal, library books
and membership numbers

Video camera
Inputting moving pictures, often pre-recorded, into a computer

Web cam
Inputting moving pictures from a fixed position into a computer

Light pen
Where desktop space is limited, it is used instead of a mouse or for
drawing applications where a graphics tablet might be too big

CRT monitor
Applications where space is not a problem.  Applications where more than
one user may need to view screen simultaneously such as in design use,
e.g. when several designers may need to offer suggestions on a prototype

TFT monitor
Applications where space is limited such as small offices.  Applications
where only one person needs to view the screen such as individual
workstations

Multimedia Projector
Applications such as training presentations, advertising presentations and
home cinema Z it displays data from computers, pictures from televisions
and video/DVD recorders

Laser printer
Applications which require low noise and low chemical emissions, e.g. most
networked systems.  Applications which require rapid, high quality and high
volumes of output, e.g. most offices and schools

Inkjet printer
Applications which require portability and low volume output, where
changing cartridges is not an issue e.g. small offices and stand alone
systems.  Applications which require very high quality output and where
speed is not an issue, e.g. digital camera applications

Dot matrix printer
Applications where noise is not an issue and copies have to be made, e.g.
industrial environments (multipart forms, continuous stationery, labels etc.),
car sales and repair companies, manufacturing sites

Graph plotter
CAD applications, particularly where large printouts are required such as A0

Speakers
Any application which requires sound to be output such as multimedia
presentations and websites including encyclopaedias.  Applications that
require musical output such as playing of music CDs and DVD films



Control devices in Control applications

Motors 
Automatic washing machines, automatic cookers, central heating controllers,
computer-controlled greenhouses, microwave ovens, robotics, production
line control

Buzzers 
Automatic cookers, microwave ovens

Heaters
Automatic washing machines, automatic cookers, central heating controllers,
computer-controlled greenhouses

Lights/lamps
Computer-controlled greenhouse