1. Data and Information

2. Difference between Data and Information
What is Data?
Age, Height, Weight, Score, …
What is Information?
The average mark of ICT in F.4
The average height of students in 4A…
Can you guess what is the difference between data and information? (P.9)

3. Types of Data
Text
Images
Audio
Video

4. Text Character coding systems
American Standard Code for Information Interchange (ASCII)
Unicode
Big5 code

5. Image Bitmap Vector Graphics
Image is represented by color dots (pixels)
Vector Graphics
Vector graphics are composed of a number of objects
Vector objects are defined by mathematical formulae

6. Audio and Video
Audio
WAV
AAC
MP3
Video
AVI
MPEG
MPV

7. Components of Information System
Purposes
Data
Processes
Technologies
Personnel

8. Information Processes
Data collection
Organization
Storage
Processing
Analysis
Transmission
Presentation

9. Information Process (Data Collection)
It is the activity of collecting raw data from outside world.
Personal interviews
Telephone interviews
Questionnaires
Experiments
Surveys…

10. Information Processing (Organization)
After the data has been collected, it must be organized into certain formats for further processed.
Manual validity checking
Data categorization
etc

11. Information Processing (Storage)
Store the data for processing later
Non-digital storage
Paper
Files
Digital storage
CD-ROMs
DVDs
Hard disks, floppy disks, magnetic tapes …

12. Information Processing (Processing)
Data processing
Sorting
Searching
Merging
Calculating
Word processing (MS Word, Open Office…)
Image processing
Video processing and audio processing

13. Information Processing (Analysis)
Extract useful information
Graphs
Charts …

14. Information Processing (Transmission)
Sending information from one computer to another.
Protocol
TCP/IP
FTP
SMTP, POP3

15. Information Processing (Presentation)
Present information
Lists, tables and charts
Can be presented through different media
Audio
Video
Screen displayed
Printed outputs

16. HW (HWB)
Content
8/9/2009
Ch.1 SQ #3-5; LQ #1

17. Format of homework H
Ch.1 SQ #3 – 5; LQ # /9/2009 3
(a) State one difference between data and information.
Ans: Data is a collection of …….
(b) Describe how a bar …
Ans: The analogue bar code … 4
Turn off the machine (6)
Turn on the machine (1)

18. HWA
Content
3/9/2009
Ch.1 Worksheet