Embedded Files
During the year you will learn about different bits of Computer Science - how computers really work. You will do a test at the end of each unit.
What makes a computer?
What makes a computer?
Input-Process-Output
Input-Process-Output
Operating systems
Operating systems
BINARY
BINARY
Numbers
Numbers
Click to play binary cards
Click to play binary cards
Letters
Letters
Colours (Colors)
Colours (Colors)
Images
Images
Have a go on the bit interpreter
Colour Depth?
Colour Depth?
Question is, how many bytes do I need to represent one pixel? The answer is depends....
Question is, how many bytes do I need to represent one pixel? The answer is depends....
Click on the left for Canterbury Uni's colour matcher
Click on the left for Canterbury Uni's colour matcher
Filesystems and Files
Filesystems and Files
Keeping your files organised.
Keeping your files organised.
What are all these files anyway?
What are all these files anyway?
Algorithms
Algorithms
Searching and Sorting algorithms
Searching and Sorting algorithms
Computers spend a lot of time Searching and Sorting data.
Computers spend a lot of time Searching and Sorting data.
Just think of how many pages Google has to search through every time you google something! Then it has to sort them so you get the best at the top.
Just think of how many pages Google has to search through every time you google something! Then it has to sort them so you get the best at the top.
Computer Scientists have spent a lot of time designing better algorithms to search and sort huge stacks of data.
Computer Scientists have spent a lot of time designing better algorithms to search and sort huge stacks of data.
The following videos will give you an idea of how they work
What are the 3 types of searching algorithms seen in the video?
Of the 3 sorting algorithms, which was the best?
Which was worst?
Can you use Binary Search on unsorted data? If not, why not?
Sorting algorithm activities
Sorting algorithm activities
Computers spend a lot of time Searching and Sorting data.
Computers spend a lot of time Searching and Sorting data.
Just think of how many pages Google has to search through every time you google something! Then it has to sort them so you get the best at the top.
Just think of how many pages Google has to search through every time you google something! Then it has to sort them so you get the best at the top.
Computer Scientists have spent a lot of time designing better algorithms to search and sort huge stacks of data.
Computer Scientists have spent a lot of time designing better algorithms to search and sort huge stacks of data.
The following videos will give you an idea of how they work
Compare different sorting algorithms
Compare different sorting algorithms
An explanation of Insertion & Quicksort
An explanation of Insertion & Quicksort
Can you describe the purpose of a sorting algorithm and compare the efficiency of different sorting algorithms?
Can you describe the purpose of a sorting algorithm and compare the efficiency of different sorting algorithms?
Questions:
Questions:
Which scale well? E.G. still work well for big groups of data
Give it a go!
Give it a go!
Use the interactive scales from CSFG to sort a collection of 'boxes'.
ERROR CONTROL
ERROR CONTROL
Error detection
Error detection
Error correction
Error correction
COMPRESSION
COMPRESSION
ENCRYPTION
ENCRYPTION
Encrypting by hand: two different ciphers
Caesar Cipher
Viginere Cipher
Cyber attacks
Cyber attacks
Frequency of attacks
Frequency of attacks
- On average a computer connected to the internet will be the target of an attempted hack every 39 seconds.
- OR on average, a computer will be the target of 2,224 hacking attempts every day.
Costs
Costs
- Cybercrime damage costs are predicted to hit $6 trillion annually by 2021.
- Cybersecurity spending will exceed $1 trillion from 2017 to 2021.
- The world will have 3.5 million unfilled cybersecurity jobs by the end of 2021.
- Ransomware damage costs are predicted to grow more than 57 times from 2015 to 2021 reaching $20 billion by 2021.
- 70 percent of cryptocurrency transactions will be for illegal activity by 2021
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