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13.3 Optical storage

A CD-ROM (Compact Disk Read Only Memory) uses a laser-based optical form of storage. This type of disk has been used for many years to distribute music and computer software. A CD-ROM drive is needed to read the disks. Data is locked into the disk during manufacture, and cannot afterwards be changed.

There are two other types of CD device for computers: CD-R (CD-recordable) and CD-RW (CD-rewritable). With the right sort of CD drive in your computer, you can 'burn' data (that is,
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4.1.2 The network

The network is a communication channel in that it conveys data from the transmitter to the receiver. The network may also manipulate data in some way, and it may also store or retrieve data.

In a mobile phone system, the network conveys the message from User l's handset to User 2's. It will also store the identity of User 1 and the duration of the call. This data is used to work out the amount to charge User 1, which is a form of manipulation of data. A network can be very comple
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3.2 Looking into the 'means of conveying a message'

The diagram in Figure 6 shows that, for communication to take place, there needs to be some means of conveying the message between the sender and the recipient. I am now going to look at the essential components of 'means of conveying a message'. In other words, I shall treat 'means of conveying a message' as a system and look at
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6.4 Using music to good effect

Music in UIs is relatively undeveloped, except in games and specialist packages designed for composers and musicians.

Some operating systems have a signature tune that is played automatically when they are loaded. This informs the user that the operating system has loaded correctly and creates a sense of identity, but can be annoying for the user if they have to listen to it repeatedly. A development on this use might be to signpost different parts of the program using musical clips.
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1.6.1 The role of sound

The use of sound is becoming increasingly common, particularly for the following types of application.

  • Applications where the eyes and attention are required away from the screen. Relevant examples include flight decks, medical applications, industrial machinery and transport. If you are a runner, you may have a heart rate monitor that allows you to monitor how fast your heart is beating. This is often indicated by an auditory beep, which speeds
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Keep on learning

Study another free course

There are more than 800 courses on OpenLearn for you t
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Information on the web

Liz Bennett and Jon Rosewell


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2 Conclusion

The versatile tiny transistor is now at the heart of the electronics industry. In the video clips you have seen the history of the incredible shrinking chip, its Scottish connections, and an explanation of the physics that make chips work as well as a reconstruction of making a transistor using the crude techniques of yesteryear.


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Further reading

There are a large number of books that have been written on e-commerce, many of which are of varying quality. I have found three useful. The first is by Kalakota and Whinstone (1997). It is an excellent introduction to both the technologies and applications involved in electronic commerce. Kalakota has also written a book on electronic commerce which avoids many of the clichés and which concentrates on unglamorous areas such as supply chain automation (Kalak
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2.4 Auction sites

These are sites on the web which run conventional auctions. There are two types of auction: those that are carried out in real time, where participants log in to an auction site using a browser at a specified time and bid for an article until the highest price is reached and no other bids are forthcoming. The other type of site – and the most common – is where an item is offered for sale and a date advertised after which no more bids are accepted. Such sites make a profit from two sources
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Learning outcomes

After studying this course, you should be able to:

  • detail what is meant by the term ‘e-commerce’

  • examine some typical distributed applications

  • detail some of the problems that are encountered when developing distributed applications

  • describe briefly some of the technologies that are used to support distributed applications

  • show how some of the technologies detailed in the course are used in concert to realise a typi
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Introduction

This course draws attention to the value of a sociocultural understanding of spoken language in the processes of teaching and learning. It focuses upon how language can be used for persuasion, control and argument, and how dialogue can act as an aid to development. Along with some background reading and activities this course offers opportunities for the evaluation of some selected classroom talk.

This OpenLearn course provides a sample of postgraduate study in Author(s): The Open University

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Chartered teachers in Scotland
Teachers often have little spare time to reflect on the day's lessons and challenges. However, this evaluation of teaching and learning experiences is vital to their professional development. This free course, Chartered teachers in Scotland, is an extract from the OU's Chartered Teacher Programme for Scotland and will help teachers to evaluate their practice and development opportunities. Author(s): Creator not set

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Key skill assessment: Communication
Communication is part of everyone's life. Being able to communicate clearly and effectively orally, visually and in writing underpins nearly everything we do. This free course, Key skill assessment: Communication, will help you recognise your strengths as well as the areas where you could improve. In developing and assessing your communication skills, you will learn to recognise, adapt and use your skills confidently and effectively in different situations and contexts.
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Teaching secondary music
This free course, Teaching secondary music, will identify and explore some of the key issues around teaching music in secondary schools. Through coming to understand these issues and debates, you will reflect on and develop your practice as a music teacher and develop a greater awareness of the wider context of music education and how this affects music in the secondary school curriculum. Author(s): Creator not set

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Leadership: external context and culture
Through studying this free course, Leadership: external context and culture, you will develop your understanding of the impact of external context and culture on the practice of leadership. The course begins by exploring the nature ‘societal culture’, identifying how culture, at a number of levels, impacts on leadership. We then explore how the external context within which an organisation operates impacts on the factors that leaders need to take account of and consequently the exercise of l
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Being an OU student
In the course, you’ll get a flavour of what OU study is actually like, learn about how you’ll be supported, the technologies you’ll use and start to develop the skills you’ll need to succeed. First published on Wed, 08 Aug 2018 as Being an OU student. To
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Beginners’ French: Food and drink
Improve your language skills by learning to communicate more easily and effectively in French. In this free course, Beginners' French: Food and drink, you will also gain an insight into French societies and cultures through focusing on food and drink. You will listen to French speakers in a variety of situations, and you will be provided with some skills for coping with reading texts. Author(s): Creator not set

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5.1 Anxiety management techniques

You may find that exams provoke levels of anxiety which are highly uncomfortable, and that you do not produce your best work under such pressure. If you tend to be a perfectionist, an exam can be particularly stressful because it has a set time limit which limits lengthy planning, rewriting and checking. Even revision can be difficult if you are constantly worrying about whether you will remember and understand your material when you are in the exam room.

Anxiety management techniques w
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