Loading presentation...

Present Remotely

Send the link below via email or IM

Copy

Present to your audience

Start remote presentation

  • Invited audience members will follow you as you navigate and present
  • People invited to a presentation do not need a Prezi account
  • This link expires 10 minutes after you close the presentation
  • A maximum of 30 users can follow your presentation
  • Learn more about this feature in our knowledge base article

Do you really want to delete this prezi?

Neither you, nor the coeditors you shared it with will be able to recover it again.

DeleteCancel

Make your likes visible on Facebook?

Connect your Facebook account to Prezi and let your likes appear on your timeline.
You can change this under Settings & Account at any time.

No, thanks

igcse ict

No description
by

Dimas Piqueras

on 2 April 2014

Comments (0)

Please log in to add your comment.

Report abuse

Transcript of igcse ict

1
2
3
4
5
6
7
8
These are the most common input devices.

Most people find them easy to use.

Keyboard are fairly large.


Index
Keyboards
Index
The Mouse is an example of a pointing device.

Mice take a little area.

Can give you a finger/hand ache.
Mouse
Input Devices
By: Dimas Piqueras
Index
Trackerballs are similar to mice.

Don’t need the same fine control as in mice.

May need training.
Trackerball
Index
Can be connected directly to a computer.

It is faster to read in text than typing it.

Sound files use up lots of memory.
Microphones
Index
A remote control is used to control the operation of other devices remotely by using infra-red signals.

Remote controls enable to operate by a distance.

Can be find difficult to use because of so many buttons.
Remote Controls
Index
WebCams are simiral to video cameras.

WebCams can be left on constantly.

WebCams have very limeted features.
WebCams
Index
Touchpads are used in many laptop computers.

They can be used even in non-flat surfaces.

The pointer is more difficult to use than a mouse.
Touchpads
Index
A numeric pad is used to enter numbers only.

Are faster than keyboards for entry of numeric data.

It is difficult to use them for entering text.
Numeric Keypad
Index
Similar functions to mice and trackerballs.

Control is in 3D.

It is harder to use.
Joystick
Index
The End.
1.1
Hardware and software:
Computer hardware is any physical device, something that you are able to touch and software is a collection of instructions and code installed into the computer and cannot be touched. For example, the computer monitor you are using to read this text on and the mouse you are using to navigate this web page is computer hardware. The Internet browser that allowed you to visit this page and the operating system that the browser is running on is software.
1.2
Main components of computer systems
CPU: The most important component of a computer system is the CPU, or central processing unit, which consists of the Motherboard, hard drive, and connector cables.
Operating Systems:The Operating System runs the software on your computer, provides security and tracks other programs to ensure compatibility. Examples include Microsoft Windows, Linux or Apple's Macintosh.
Systems analysis and design
8.1:
8.2:
8.3:
8.4:
8.5:
8.6:
A systems analysisi team is often brought in to review an existing system and suggest a number ofimprovements. The existing method used used may be eather a manual paper-based system or a computer-based operation that is no longer regarded as adequated for the task.
introduction:
analysis stage
1:
2:

3:

4:

5:
facts finding/collection data from the current system
Description of the current system -establishing the inputs, ouputs and processing being done.
identification of the problems with the current system
agreeing the objectives with the custoimer
identifying and agreeing the customer´s requirements
design stage
Once the analysis has taken place and the system analyst has some idea of the scale of the problem and what needs to be done, the next stage is to
design
the key parts of the recommend system.
Development and testing
Once the design stage is completed, it is the necessary to create the system and fully test it. the section considers some of the development stages and testind strategies which are often adodepted by systems analysts.
Implementation
Once the system is fully tested, the next stage is to fully implement it. We will now consider
changeover
to the new system in more depth. There are 4 common methods used for changing over from the old system to the new system. Each one has advantages and disadvantages.
Documentation
Once the new system
IGCSE ICT
expert systems
*these systems have been developed to mimic the expertise and knowledge of an expert in a particular field:
+diagnosing a person´s illness
+diagnostics
+prospecting for oil and minerals
+tax and financial calculations
*definitions:
+
knowledge base
:design and creativity.
+
rule base:
design and creativity.
+
inference engine:
is designed and created
advantages:
-expert systems provide consistent answers
disadvantages:
-it can be expensive to set up the first place

storage devices and media
A storage device may hold information, process information, or both. A device that only holds information is a recording medium. Devices that process information (data storage equipment) may either access a separate portable (removable) recording medium or a permanent component to store and retrieve information.
knowledge base
rendering a video
tweeding
Faster data retrieval
Easy expansion (Add a table)
Data integrity
All other data is up to date once an update is made as data is not repeated
A foreign key in one table is a primary key in another

Relational databases cont.

Introduced in 1970
A number of tables
Primary Key
Combine data from different tables to create a report
No need to repeat data

Relational databases

Where is adc used in a central heating system?

Where is dac used in a central heating system?

Control System

Computers only understand digital
Must use an adc

If a computer is used to control an analogue device then a digital to analogue converter is required

Analogue to digital Converter (AdC)

How do we know the values…
Speedometer
Position of pointer on a dial

Thermometer
Height of liquid

Sensors measure these physical, analogue quantities

Analogue devices

Digital data
Discrete, fixed values in a given range
Analogue data
Real world data
Continuously variable
Infinite number of values within a given range
Length, Weight, Temperature, Pressure

Analogue & digital data

Structured to allow
Manipulation
Searches
Up to date info for external applications
Data duplication minimised
Easy to expand
Secure as controlled by front end
Reports generated

Databases

Unique
Used to locate a record in a file

Primary Key / Key field

Integer
Whole numbers (+ive or –ive)

Real
Everything

Numeric

True / False
Yes / No
1 / 0
binary 1/binary0

AND – True for both cases
OR – true for at least one case

Logical / Boolean

Ch 5

Data Types

Contains all the data in one table

Flat file structure

DD/mm/yyyy
DD/mm/yy
DD.mm.yy
mm/DD/yyyy
yyyy/mm/DD
DD mmmm yyyy
DD-mmm-yyyy

Date Data

Text
A to Z
Alphanumeric
A to Z anD 0 to 9

Declankeogh………………Text
Declankeogh01……………Alphanumeric

Alphanumeric

Logical / Boolean

Alphanumeric / Text

Numeric

Date

Types…

Data stored in files


Files consist of records


RecorDs contain fields

Data structures
Full transcript