Distributive property
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The document discusses the distributive property in mathematics. It explains that the distributive property means taking something and sharing it around, such as multiplying a term outside parentheses by each term inside. It also discusses the FOIL method for distributing terms in multiplication, where the First, Outer, Inner, and Last terms of two expressions joined by multiplication are each multiplied individually. Finally, it notes the key insights that ab + a = a(b+1) and shows deMorgan's laws.
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Turtle graphics
A turtle can be commanded to crawl over a sheet of paper with a pen tied to its tail. The turtle module in Python allows you to control a turtle shape to draw on a graphic window. Basic turtle commands include moving the turtle forward or turning it right by a set number of degrees. Challenges for using the turtle include drawing shapes like squares and hexagons of varying sides, as well as getting the turtle to draw a person's initials.
Database field types
This document discusses database field types and provides examples of validation and verification checks. It contains information about text, number, integer, real, date/time, and boolean fields that can be used in a database. Examples of validation include checking for a minimum height of 11.7 metres and verifying a date is in the correct format of 31st April 2012.
Kodu controls
The document provides instructions for creating a countdown timer, spawning enemies, and a Kodu challenge to make a game with those elements. It explains how to create a 'referee' object to track time remaining, program it to subtract one second each turn from the start time. It also describes how to create an enemy, make it 'creatable', and program a spawning object to create enemies using a timer. The challenge is to make a game with a score, timer, spawning enemies, objectives, and clear win/lose conditions in an interesting world.
Pascal names and types
This document discusses variables, assignment, and types in the Pascal programming language. It provides an example program that asks the user to input a number between 1 and 99, analyzes their "personality" based on that number, and ends the program. It also discusses values, variable names, assignment, statements, and operators in Pascal. Finally, it provides challenges to write programs to convert Fahrenheit to Celsius and perform basic math operations on two user-input numbers.
Python part two names and types
This document discusses Python variables, data types, and basic operations. It includes:
1) An introduction to variables and data types in Python, including integers, strings, and floats.
2) Details on assigning values to variables through assignment statements and how variables store copies of values.
3) An example program that takes a user-input number and performs a personality analysis based on that number.
4) A challenge to write a Fahrenheit to Celsius temperature converter program in Python.
Abstraction - Year 9
This document discusses two processes for abstracting information called cats and dogs. Cats involves ignoring unnecessary details while dogs involves identifying common patterns across multiple examples. It instructs groups to make an image puzzle requiring abstraction to solve, similar to the example but more difficult to determine the subject. The puzzle should follow the dogs process of identifying patterns across multiple internet images with unnecessary details removed.
Thinking about your project
This document provides advice for choosing a project for COMP 4. It notes that managing a complete IT project from start to finish is a unique opportunity, but that such projects are often not fun due to a lack of real-world expectations, underestimating paperwork, feature creep over time, and poor time management rather than technical problems. It recommends choosing a complex project that interests the student and includes advanced algorithms, data structures, classes, mathematics, or technologies like simulations, portable devices, communication protocols, or image processing. The project should address a real problem and have a real end user.
The rail fence
The document discusses the rail fence cipher technique for encryption and decryption of text. It explains that the rail fence cipher arranges the characters of a plaintext message in a diagonal pattern, alternating between moving down and up in rows. It also uses two counters, one starting at the beginning and looping once, and the other starting after the first and looping to the end, to encrypt the message by reading down the columns.
Lesson 1
The document discusses programming concepts like variables, branching, and looping. It then introduces Scratch, a programming environment where users can create animations using sprites. It provides step-by-step instructions on how to program a cat sprite in Scratch to point towards and move towards the mouse pointer.
Rsa encryption
Public key cryptography uses a pair of keys - a public key for encryption and a private key for decryption. The keys are generated as follows:
1) Choose two prime numbers and multiply them to get n
2) Calculate φ(n) as (p-1)(q-1)
3) Choose a public key k that is relatively prime to φ(n)
4) Calculate the private key j using k*j=1 (mod φ(n))
To encrypt a message P, compute E=P^k (mod n). To decrypt, compute P=E^j (mod n).
Server side scripts
Server-side scripts allow for dynamic web page generation and user interaction by running programs on the server. Client-side form inputs are sent to the server as name-value pairs via GET or POST requests. Server-side programming/scripting languages like PHP then generate HTML dynamically based on the form values submitted. For example, a form using the GET method sends user inputs in the URL, and a PHP script can echo those values on the resulting page.
Revision topic 1 sensors and control
Sensors measure physical properties and translate them into analog electrical signals. Common sensors detect light, sound, temperature, pressure, acceleration, motion, and heat. Analog signals have a continuous range of values, while digital signals are discrete on/off values. To use sensor readings in computers, analog signals must be converted to digital. Monitoring involves simply measuring something, like the weather, while control uses feedback - sensors provide measurements to a computer program that sets control values to influence a motor or actuator.
Mtslesson
The document discusses getting an antidote from Mr. Macleod's computer in order to save someone now. It also mentions Mr. Macleod's computer security systems and encryption. The document suggests explaining how the computer's security was overcome to access the needed antidote.
More from grahamwell (20)
Distributive property
- 1. Distributive property • Distributing – take something and share it around a(b+c) = ab + ac • Multiplication • Every term inside the brackets
- 2. FOIL method - distribution • (a + b) (c + d) • F irst two = ac • O uter two = ad • I nner two = bc • L ast two = bd • Result = ac+ad+bc+bd
- 3. The key insights .. • ab + a = a(b+1) = a • ab + ab = b(a+a) = b • a+(b.c) = (a+b)(a+c)
- 4. deMorganising a+b a.b a.b a+b a.b a+b a.b a+b