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2.3 Electromagnetic radiation

To help explain the nature of the waves of energy known as electromagnetic radiation, visualise a pond into which a stone has been thrown. If the state of the pond is ‘frozen’ at an instant in time, the height or depth of the water's surface at that moment will vary with distance from the source of the disturbance. If you were to cut a slice through the pond, you would see a wave shape similar to Author(s): The Open University

Learning outcomes

When you have completed your study of this unit, you should be able to:

  • understand and use correctly terms introduced in this unit in relation to communication networks;

  • understand general principles involved in data exchange between ICT devices;

  • work with numbers expressed in scientific notation, and use the Windows calculator to perform calculations on these numbers.


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Introduction

This unit is from our archive and it is an adapted extract from Networked living: exploring information and communication technologies (T175) which is no longer in presentation. If you wish to study formally at The Open University, you may wish to explore the courses we offer in this curriculum area.

This unit looks at communication systems where devices are th
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Figure 1 ENIAC Computer. Photo © Science Photo Library

Rozin, D. ‘Wooden Mirror’, 2001, IEEE Spectrum, March 2001, p.29. Co
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7.3 Quality of customer service

This is probably the key determinant of customer satisfaction. Most online transactions go through flawlessly. But some don't. Goods fail to arrive, or are delayed, or delivered to the wrong address. Or what is delivered doesn't match what you ordered. With a real-world bricks-and-mortar retailer, the solution is obvious: you phone or turn up at their premises and speak to a human being. But what do you do if an online order goes wrong? Whom do you phone? And where is the number for customer
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4 The eBay phenomenon – what it means

Writers on e-business group Internet processes into four categories, using this grid:

Figure 13
Figure
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2.1 Exploring eBay

First, have a look around the eBay system to get a feel for how it works.

Go to the eBay website

Find an item that interests you, either by clicking on the categories in the left-hand panel …

The Categories displayed on eBay. It starts: Antiques &Art; Automotive (Cars | Classic Cars | Motorc</span><br><span class=Author(s): The Open University

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1 Introducing eBay

One of the earliest popular applications of the Web was an online auction system called eBay. Think of it as an enormous car-boot sale. In an ordinary (offline) auction system, you brought things you wished to sell to an auctioneer who catalogued and then sold them on your behalf at a physical auction attended by people who placed bids for the goods. There would be a series of bids with the auctioneer encouraging people to bid against each other, thereby raising the selling price. The highest
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Learning outcomes

By the end of this unit you should be able to:

  • describe and use safely eBay and Amazon;

  • describe some of the technologies that underpin online shopping and auctions;

  • confidently approach new tasks involving online shopping and auctions.


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6.3 Authentication of information

When I watch TV news, listen to the radio or buy a newspaper I never think to question whether I really am watching ITV, listening to Radio Five Live or getting the Guardian. In each of these cases it is theoretically possible that they are not who they say they are, but the practicalities of performing the masquerade are so complicated that the possibility can be discarded.

With emails and websites it is a very different matter. Indeed, in recent months I have received several e
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4.2.2 Thank, acknowledge and support people

People can't see you nod, smile or frown as you read their messages. If they get no acknowledgement, they may feel ignored and be discouraged from contributing further. Why not send a short reply to keep the conversation going? This can make a big difference in a small group setting like a tutor-group conference. (But bear in mind that in a large, busy conference, too many messages like this could be a nuisance.)


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1.3 When is the right time to take notes?

Any time that suits you! Increasingly we live in an age where there is more information than we can possibly hope to deal with. One of the most important skills you (or any of us) can develop is how to cope with all this information. Note taking is just one skill that will help you do this. It is important to get into the habit of making notes, and the best way to do this is to find a method that suits you (and the medium you are working in).


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Learning outcomes

By the time you have completed this unit you should:

  • know the meaning of all the terms highlighted in the text;

  • understand the concept of the ‘network society’;

  • have an awareness of how ICTs impact on your everyday life.


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Acknowledgements

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All materials in this unit are derived from content originated at the Open University.

1. Join the 200,000 students currently st
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Introduction

Enterprise systems are software applications that automate and integrate all many of the key business processes of an organisation. With some understanding of software development, you will learn about current development practices for this type of system and develop relevant skills to apply them to real-world problems. You will develop core skills in object-oriented analysis and design, allowing you to develop software that is fit for purpose, reusable and amenable to change.

This unit
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4.1 Introduction

Many of you will already be familiar with event processing if you have developed visual interfaces with the later versions of Java. Developing such an interface consists of a number of steps:

  • A visual object such as a button is placed in a container such as an applet or a object.
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2.4 The message passing idea

Figure 1 shows the central idea behind the message passing paradigm. It involves an architecture in which clients and servers communicate using communication lines. In this model, in contrast with the others that are to be presented in this unit, the underlying structure of the network is visible via the communication media used to connect servers and clients and devices such as sockets, ports and server sockets which are involved in the transfer of a message from one computer to another.


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Learning outcomes

After studying this unit you should be able to:

  • describe some of the architectural and programming paradigms used in distributed system development;

  • describe message passing and the role of protocols within a message passing paradigm;

  • introduce the concept of a distributed object;

  • describe how event-based architectures are used within distributed system development;

  • introduce one implementation of an event-based archite
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1.1.2 La mairie/l'hôtel de ville

The French use both la mairie and l'hôtel de ville when referring to the town hall. In general, la mairie is used in smaller towns and villages. La mairie is also used to describe the range of functions and services headed by le maire (the mayor).


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Curriculum framework in Scotland
In this unit you will find a discussion of the national curricula framework in Scotland. This is discussed in terms of the literacy curricula, and compared to the framework set up in England and Wales. First published on Fri, 29 Jul 2011 as Author(s): Creator not set

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