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Network security
Encryption of files and firewalls are just some of the security measures that can be used in security. This free course, Network security, which assumes you have a substantial knowledge of computing, helps to explain the intricacies of the continually changing area of network security by studying the main issues involved in achieving a reasonable degree of resilience against attacks. Author(s): Creator not set

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Systems thinking and practice
What is systems thinking and practice? The essence of systems thinking and practice is in 'seeing' the world in a particular way, because how you 'see' things affects the way you approach situations or undertake specific tasks. This free course will help you to learn about the problems of defining a system and meet some of the key concepts used in systems theory: boundary, environment, positive and negative feedback, etc. Author(s): Creator not set

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Internet of everything
The internet of everything (IoE) is the networked connection of people, process, data and things. As more people, data and things come online, we develop processes to harness the vast amounts of information being generated by all these connected people and things. The goal of this free course is to introduce you to fundamental concepts and technologies that enable the IoE and the internet of things. Author(s): Creator not set

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References

Coffman, K. G. and Odlyzko, A. (1998) ‘The size and growth rate of the Internet’, First Monday, Vol. 3, Issue 10, http://firstmonday.org
ITU-T 1–150 (1999) B-ISDN Asynchronous Transfer Mode Functional Characteristics, ITU-T.
ITU-T X.200 (1994) Open Systems Interconnection – Model and Notation, ITU-T. (Also known as ISO/IEC 7498–1.)

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Keep on learning

Study another free course

There are more than 800 courses on OpenLearn for you to
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5.3 Regaining meaning

Suppose for a minute that the numbers I presented above were generated by a scanner as it produced a bitmap of a photograph. Clearly, the machine on which they are stored will have to get the image back to us by means of a device that can render it into a form meaningful to the human eye – an output device. I shall shortly review such devices. However, there is still work to be done before the computer can pass digitally-encoded data to such a device. For a start it will need to have
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7.3.1 Finding the 2's complement

In Section 2.4 you saw how to find the 2's complement representation of any given positive or negative denary integer, but it is also useful to be able to find the additive inverse of a 2's complement integer without going into and out of denary. For instance, 1111 1100 (−4) is the additive inverse, or 2's complement, of 0000 0100 (+4), but how does one find the additive inverse without converting both binary integers to their denary equivalents?

The answer is that the additive inve
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2.2 The characteristics of text

Text has a number of technical advantages over other media.

  • Text files are small. Images, sound, animation and video all produce large computer files, even when compressed. These files can be slow to load from CD-ROM or to transmit via the Internet; this can reduce the usability of the UI. Text files are much smaller.

  • Text can be manipulated very easily. For example, it is possible to search for words. If you are visiting a
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7.4 Using flowcharts to describe a task (contd)

Now consider what happens when you are weighing, for example, flour on a set of scales. You slowly add more flour to the scalepan until you reach the desired weight. As you do this the display constantly changes, showing the weight increasing as you add more flour. To do this, the scales’ computer must repeatedly examine the input and update the display each time it does so. The flowcharts in figures Author(s): The Open University

2.3 Computer systems

So far, I have introduced the major components of a computer, namely a processor along with input and output devices, plus main and secondary memory. I now want to explore three of these components a little further, starting with input devices.

Input devices have to collect some information from outside the computer and present it to the computer as data which is in a form the processor can work with. (Strictly speaking, ‘data’ is the plural of the Latin word ‘datum’. But in the
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History as commemoration
Commemoration - remembering and marking your past - makes an important contribution to our sense of community. This free course, History as commemoration, considers ways in which written texts, memorials, letters and photographs can all serve to commemorate events, people and values we wish to remember from our past. First published on Wed, 19 Dec 2018 as
Author(s): Creator not set

Children and young people’s participation
Listening to children is a first step in the participation agenda, which is reasonably well established. By contrast, enabling children to share in decision making lags some way behind. This free course, Children and young people's participation, emphasises that the adoption of an integrated approach to participation by different sectors of the children's workforce is of crucial importance. Author(s): Creator not set

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Discovering Wales and Welsh: first steps
This free course, Discovering Wales and Welsh, introduces you to who the Welsh people are via a brief look at history and two significant figures, Owain Glyndŵr and Llywelyn the Last. You will also learn the basics of Welsh pronunciation and how to greet people in Welsh. First published on Mon, 07 Mar 2016 as Author(s): Creator not set

The world of the primary school
Primary education is a dynamic and exciting area to study and become involved in. This free course, The world of the primary school, introduces the various members of a primary school community, and considers the nature of their involvement and how this has evolved in the UK over recent years. It explores ideas about the primary school curriculum and the role of teachers and support staff in supporting children's learning.Author(s): Creator not set

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Exploring sport coaching and psychology
This free course, Exploring sport coaching and psychology, investigates how scientific and management ideas contribute to success while also taking you on a journey through unique sporting case studies and insights that will change how you view and study sport. You will consider how the mind, the body, the environment and training techniques all contribute to optimum fitness.Author(s): Ben Oakley

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Method 1

First of all, do some of the relaxation exercises we have described above. Then imagine yourself in this calm state taking the exam. You feel purposeful and confident. You see yourself at a desk in the exam room environment. You feel entirely at home and attuned to that moment, working effectively and concentrating well.

Now practise visualising this positive, clear, realistic image over and over again.


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5.3 Technique 3: Visualisation

Creating calming pictures or images in your mind, or 'visualising', can really help you to relax.


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4.2.4 Plan your time

When planning to use the time available, you should:

  • make sure that you are answering the right number of questions

  • divide your time according to the weighting of the questions

  • write down the finishing time for each question

  • try to allow for 10 minutes checking time at the end.

Stick to your plan. Evidence indicates that two half-answered questions obtain more marks than one completed
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1.3.4 Stage 2: Find a way in

Bearing in mind your analysis of the overt purpose of the piece of writing, whether it is explicitly social science or art, politics, entertainment etc., try to establish its basic point, its most obvious message. What is the title or headline; is it clear and ‘factual’, does it refer to some previous debate or require some sort of previous knowledge? Are there sub-headings and can you get an idea of how the ‘story’ goes from them? Skim read the introduction and the conclusion. Can yo
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1.2.3 Stage 1: Preparation

Numbers and diagrams are highly abstract and condensed summaries of the world. They require a degree of mental effort to bridge the gap between them and the aspects of the ‘real’ world they stand for. Approach them slowly and with care, allowing yourself time to get the feel of what you are looking at. Don't assume you already know what you are looking at.


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