2.3 Models of an ICT system

To help me to introduce you to important ideas about ICT systems, I'm going to take a three-stage approach. ICTs involve conveying, manipulating and storing data. This is going to be the basis of my approach.

Firstly, in the next few sections, we'll look at ICT systems where the primary function is to convey data. We can think of these systems as communication systems and I'll use a mobile phone system as an example.

In sections 8–14, I'll focus on ICT systems wher
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Counting to Thirty
This is a simple video counting to thirty. Large colored numbers are shown on a black screen while an instructor says the number.  (01:06)
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Women In Art [The Original Artwork] [Part 2]
Beethoven: "Moonlight Sonata"
Bach: "Air On The G String"
Debussy: "Clair de Lune"
Dvorak: "The New World" [from Symphony #9]

Title of the painting, the artist, and circa are all listed on the painting. (10:01)

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Measuring Our Underground Water Supplies from Space
Matt Rodell spoke about his research on the measurement and modeling of freshwater availability based on ground and satellite observation. Improving understanding of the variability and changes in soil moisture, snow, and groundwater has implications for weather and climate prediction, water management, agriculture applications and natural hazards such as floods. For transcript, captions, and more information, visit http://www.loc.gov/today/cyberlc/feature_wdesc.php?rec=6611
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8.1.1 Visibility

Recall that a key usability design feature identified by Donald Norman – from his analysis of using everyday objects such as doors – was visibility. An everyday object such as a door, or a control such as a button on a product should appear to be obvious about how it is used, and indeed it should perform that obvious function. For example, is it obvious how you insert a disc into a player? Is it obvious how you switch the machine on, adjust volume, and so on?


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Chris Brown named as asault suspect
Grammy-winning R&B singer Chris Brown named by Las Vegas police as a suspect after a man is punched during a basketball game. Paul Chapman reports. Subscribe: http://smarturl.it/reuterssubscribe More updates and breaking news: http://smarturl.it/BreakingNews Reuters tells the world's stories like no one else. As the largest international multimedia news provider, Reuters provides coverage around the globe and across topics including business, financial, national, and international news. For ov
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Introduction

Accessibility to eLearning for disabled students is a topic which could be included in any area of the curriculum. Most education professionals are aware that they should consider it, but are unsure of what it means, and how to make their eLearning materials accessible to students with a range of disabilities. This free course addresses that need.

If you are interested in this topic, The Open University offers an Author(s): The Open University

7.1 Overview

Scottish literature is defined as literature written in Scotland or by Scottish writers, but is there such a thing as a literary and cultural identity which is distinctively Scottish?

This section of the OpenLearn Scotland collection is designed to stimulate thinking on the relationship between writing and identity. Learners are introduced to the work of two enormously influential figures in Scottish literature and culture: Sorley MacLean and Jackie Kay, the contemporary Scottish poet a
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Girodet, The Sleep of Endymion, 1791
NOTE: Front Male Nudity. Anne-Louis Girodet de Roussy-Trioson, The Sleep of Endymion, 1791, oil on canvas, 1.98 x 2.61m (6 feet 5-¾ inches x 8 feet 6-¾ inches), exhibited in the salons of 1793 and 1814 (Musée du Louvre, Paris) (02:49) Speakers: Drs. Beth Harris and Steven Zucker
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2.2 Describing positions along a line

To take a definite case, consider a car moving along a straight horizontal road. The car can be modelled as a particle by supposing the particle to be located at, say, the midpoint of the car. It is clearly convenient to measure the progress of the car with respect to the road, and for this purpose you might use the set of uniformly spaced red-topped posts along the right-hand side of the road (see Figure 5). The posts provide a way of assigning a unique position coordinate to the car
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Apocalypse Now? Modern Maya and Ancient Prophecies
Watch video of Mareike Sattler, senior lecturer, Anthropology Department, and Avery Dickins de Girón, assistant director of the Center for Latin American Studies, speaking at the Osher Lifelong Learning class, “Apocalypse Now? Modern Maya and Ancient Prophecies”. This seminar introduces students to Maya culture from ancient to modern times. Maya people and culture have been featuredkeep reading »
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Rights not set

Creating Harmonies on National Kazoo Day
The Trumpet Ensemble at Texas Tech University put away their horns and played the fight song with a kazoo.
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History of Homelessness
John Foran, Praxis Housing CEO delivers a speech about the History of homelessness during a fund raiser at the West Point Club. (08:14)
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Facebook: The Strength of Weak Ties
Veronica Sartore interviews Dr Bernie Hogan about his research on the social networking site Facebook, differences between online and offline relationships, how personal boundaries are regulated and the strength of weak ties.
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6.1 Controlling things

As you learned in Section 1, computers can collect, process, store and distribute information. This section shows that they can also be used to:

  • control machines and simple mechanisms;

  • conduct a special kind of commerce: selling on the web.

Let us examine more closely that common household appliance, the automatic washing machine. Virtually all such machines sold in the last decade or so are controlled using a microcomput
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1.2.1 What evidence are we reading?

Although we live in a society where a huge amount of information is available in the form of numbers, some of us still feel a mental fog descend when we are asked to deal with them. This is because numerical information is information in a very condensed and abstract form. A number on its own means very little. You have to learn to read it. Numeracy (the ability to work with numbers) is a skill that we can learn. It is a very useful skill, because it allows us to understand very quickly the <
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Those Golden Eggs Come From Somewhere: Internet Regulation at a Crossroads
A discussion of how largely well-intentioned political and legal reactions to the highest-profile risks of ICT creates a danger of perhaps killing the goose that is giving us golden eggs of innovation, decentralization, and personal empowerment. From its inception, many have recognized the Internet's potential as a liberating, decentralizing, and, yes, destabilizing technology but also its counter-potential as a controlling and centralizing technology. Over the last two decades, predictions abo
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Repatriation and returning remains
19th Century philosopher Jeremy Bentham allowed his body to be put on public display after he passed on but would you allow your body to be displayed after you die? The following video and audio collection examines specific cases in which the issue of display and ownership are raised and explores how museums have handled this question. Experts share reasons for their beliefs regarding repatriation and refer to specific examples on the topic of whether remains should be returned to their country
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Except for third party materials and otherwise stated (see http://www.open.ac.uk/conditions terms and conditions), this content is made available under a http://creativecommons.org/licenses/by-nc-sa/2

3.3.1 The human perceptual system

In order to survive, all living things have evolved some sort of ability to sense or perceive the world around them. Even the humble amoeba is sensitive to light. Complex animals have intricate perceptual systems that respond to many different features of their environment – insects, despite their impressive eyes, are most sensitive to trails of chemicals; bats are blind to light but responsive to sonar pulses; dogs and pigs depend more on smell than vision for sensing the world.

We w
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Acknowledgements

Except for third party materials and otherwise stated (see terms and conditions), this content is made available under a Creative Commons Attribution-NonCommercial-ShareAlike 2.0 Licence

Grateful acknowledgement is made to the following sources for permission to reproduce material in this unit:


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Except for third party materials and/or otherwise stated (see terms and conditions) the content in OpenLearn is released for use under the terms of the Creative Commons Attribution-NonCommercial-Share