Computer evolution Image source: Upgrade Reality, ‘Evolution Man into Computer’, available from: http://www.upgradereality.com/images/evolution-white.jpg, date accessed 15/10/11
Activity – 15 minutes In small groups, spend 10 minutes sharing your memories of your first computer. Think also about your current computer. Then, try to summarise the main differences. What has changed since those days? Image source: Extra Ketchup, ‘Electronics club 1986’, http://www.flickr.com/photos/27315689@N00/440680363/
Image source: Gordon Moore, available from http://www.vcharkarn.com/uploads/224/225132.jpg Source article: Moore, G. (1965), ‘Cramming more components onto integrated circuits’, ftp://download.intel.com/museum/Moores_Law/Articles-Press_Releases/Gordon_Moore_1965_Article.pdf Later revised this to every 2 years (in 1975)
Image source: Jeff Will, ‘On top of the city’, http://www.flickr.com/photos/35708620@N00/439227689/
Can exponential growth continue indefinitely? Activity – take a piece of paper, fold it in half… then fold it again… how many times can you fold it? Why stops you from continuing to fold it? Image source: Visual Panic, ‘Sitting down here – Lene Martin’, http://www.flickr.com/photos/41754875@N00/2054645212/
Activity – read through article and then evaluate based on the PROMPT criteria – 15 minutes
Open University - TU100 Day school 1
TU100 Day School 1 Sarah Horrigan, Associate Lecturer, Region 05
Today’s agenda <ul><li>Overview of session </li></ul><ul><li>The evolution of computers </li></ul><ul><li>Binary </li></ul><ul><li>HTML </li></ul><ul><li>Evaluating sources - PROMPT </li></ul>
Aim to leave today knowing… <ul><li>A little more about Parts 2 and 3 of Block </li></ul><ul><li>What are the main stages of evolution for computers </li></ul><ul><li>Moore’s Law and exponential growth </li></ul><ul><li>The basics of binary and counting in binary </li></ul><ul><li>Where to start with HTML </li></ul><ul><li>How to evaluate a web resource </li></ul>
Block 1 <ul><li>Introduces the concepts of data and information e.g. Data storage </li></ul><ul><li>Internet, HTML and RSS </li></ul><ul><li>Wireless networks </li></ul><ul><li>Basic programming using sense </li></ul>
Activity What was your first computer? What is your current computer? What are the main differences?
Moore’s Law “ Transistors on a chip will double every year for the next 10 years” Gordon Moore, 1965
Exponential growth? “ Growth in which each value is a fixed multiple of the previous value”
Activity <ul><li>Take a piece of paper… </li></ul><ul><li>Fold it in half… </li></ul><ul><li>… then fold it again </li></ul><ul><li>How many times can you fold it? </li></ul>
Writing it down… Hint: x -n = 1/(x n ) x n = x multiplied by itself n times
Writing really big / small numbers <ul><li>5 trillion? </li></ul><ul><li>= 5,000,000,000,000 </li></ul><ul><li>= 5 x 10 12 </li></ul><ul><li>0.000000005? </li></ul><ul><li>= 5 x 10 -9 </li></ul>
Web addresses / URLs <ul><li>The anatomy of an Uniform Resource Locator (URL) </li></ul><ul><li>Scheme defines how the browser should form its requests to access the resource. For web pages the scheme ‘http’ represents the hypertext transfer protocol (HTTP or for secure transfers HTTPS). </li></ul><ul><li>Host is the name of the server computer that holds the web page. </li></ul><ul><li>Path is the name of the pathway to the file on the serve - typically this file will reside inside a ‘nest’ of directories (folders). </li></ul>
<ul><li>Heading </li></ul><ul><li>The first paragraph is often an introduction. </li></ul><ul><li>Subsequent paragraphs can form part of the body. </li></ul><ul><li>Lists are useful ways of highlighting key points: </li></ul><ul><li>point 1 </li></ul><ul><li>point 2 </li></ul><ul><li>Using bold can also highlight key terms </li></ul>
P resentation R elevance O bjectivity M ethod P rovenance T imeliness
Presentation (is the information clearly communicated?) Look at language, layout, structure, etc.
Relevance (does the information match the needs of the searcher?) Look at the introduction or overview – what is it mainly about?
Objectivity (Is the author´s position of interest made clear?) Look for an introduction or overview – do the writers state their position on the issue? Is the language emotive? Are there hidden, vested interests?
Method (research reports only) (Is it clear how the data was collected?) Were the methods appropriate? Do you trust it?
Provenance Is it clear where the information has come from? Can you identify the authors or organisations? How was it published?
Timeliness (Is it clear when the information was produced?) Does the date of the information meet your requirements? Is it obsolete?