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Asset allocation in investment
This course looks at how to take investor objectives and constraints and turn them into a portfolio which aims at achieving an expected return and level of risk appropriate for the investor. In this free course, Asset allocation in investment, portfolio optimisation techniques such as portfolio theory can be used to determine how much of an investor’s portfolio to put in each asset class. Portfolio theory can also be used to determine so-called model portfolios which offer optimised benchmarks
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Learning outcomes

After studying this course, you should be able to:

  • list the skills and knowledge needed to conduct full and fair recruitment and selection

  • undertake full and fair recruitment and selection systematically.


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Population ageing: a global health crisis?
This free course, Population ageing: a global health crisis?, focuses on two major issues of our time – ageing societies and global health. It provides you with an introduction to ageing societies and their implications for global health – implications which are only just beginning to be fully understood. The course will help you to deepen your understanding of ageing societies across the globe and the different components of the concept of global health. You will also explore the ways in wh
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Digital forensics
Digital evidence features in just about every part of our personal and business lives. Legal and business decisions hinge on having timely data about what people have actually done. This free course, Digital forensics, is an introduction to computer forensics and investigation, and provides a taster in understanding how to conduct investigations to correctly gather, analyse and present digital evidence to both business and legal audiences. It also outlines the tools to locate and analyse digital
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Keep on learning

Study another free course

There are more than 800 courses on OpenLearn for you to c
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4.3 IP over ATM

You have seen that the IP protocol supports a connectionless service, and the ATM and TCP protocols support a connection-oriented service.

SAQ 8 (Revision)

What are the relative advantages and disadvantages of connect
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4.2 ATM layers

In this section I shall briefly review some of the main functions of the ATM layers but I shall not go into too much detail because at this stage we are interested in only the general points about protocols.


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3.4 Transmission control protocol (TCP)

As I outlined in the previous section, peer entities in clients and servers exchange HTTP protocol data units when they wish to transfer a resource over the web. I gave very little detail about this because I wanted to focus on the general features of protocols in the application layer of the TCP/IP model. The HTTP protocol data units are transferred from the sender host to the receiver host by calling on the services of the transport layer. In the case we are considering, the transport layer
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7.1 Introduction

Earlier on I indicated that in order for a processor to perform a defined function it needs to be supplied with a list of instructions called a program. In this section I shall explore this idea a little further.

Software can be split into two categories, application software and operating systems. Application software is the name given to programs which enable a computer to perform specific tasks. The program that processes the image in the digital camera is one example; a word
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Learning outcomes

After studying this course, you should be able to:

  • understand what all the terms highlighted in bold in the text mean

  • understand the fundamental hardware components that make up a computer’s hardware and the role of each of these components

  • understand the difference between an operating system and an application program, and what each is used for in a computer

  • describe some examples of computers and state the effect that the use of
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References

Higgins, J. (2004) Introduction to SNG and ENG Microwave, Elsevier Focal Press, Oxford.
Jones, J. and Seenan, G. (2004) 'The camera today? You can't trust it. Hockney sparks a debate', The Guardian
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4.2.5 Focusing

Focusing is done by adjusting the size of the gap between the lens and the light sensor. To get distant objects in focus, the gap needs to be smaller than that required for close objects (see Figure 7 below).

4.2.4 CCD light sensor

The CCD light sensor is a transducer that converts light to an electrical signal. CCD stands for 'charge coupled device', and physically a CCD light sensor is an integrated circuit with a transparent cover. A photograph of one is shown in Figure 6. Under the cover is a rectangular array of light-sensitive electronic components cal
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4.2.3 Lens system

The function of the lens system is to project an image onto the CCD light sensor. A well-designed system ensures that the image is sharp – in focus – and bright. To achieve this, what is needed is a good-quality glass lens (or rather a series of lenses) and accurate focusing. The brightness of the image depends upon the size of the lens. The bigger the lens, the brighter the image, but bigger lenses are more difficult to make and therefore more expensive. Also, of course, bigger lenses me
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Primary science: supporting children’s learning
Science is a key subject area in primary education curriculum frameworks. This free course, Primary science: supporting children's learning, provides an opportunity to consider your own experiences, perceptions and attitudes to science. You will explore and develop some of your scientific knowledge and understanding while considering how you can support primary-aged children's science learning. Author(s): Creator not set

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2.2.2 ‘Visual deficit’ hypotheses

Samuel Orton was one of the earliest and most influential researchers into dyslexia, although he used the term strephosymbolia – literally meaning ‘twisted symbols’. He noticed that children with specific reading difficulties often wrote letters back to front, confused letters such as ‘b’ and ‘d’, and would swap the position of letters within a word during spelling (e.g. ‘was’ might be written ‘saw’). From these and other observations, he suggested that their read
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2.1 Behavioural, cognitive and biological perspectives

So far we have discussed what contributes to our ideas of ‘abnormality’ and these issues have been illustrated by examining the real-life example of dyslexia. We will now consider the different potential explanations that have been offered to account for the observed symptoms of dyslexia.

Uta Frith (1999) has provided a useful framework for thinking about the nature of developmental difficulties (see Figure 2).

Frith suggests that there are three main perspectives on any given
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1.8 Reflecting on definitions of ‘abnormality’

The main thing to remember is that the way that ‘abnormality’ is defined will have consequences for the method of identification. It will also impact on people's expectations of their future development. For example, we discussed the way that dyslexia is defined in relation to a person's IQ. Does that mean that if someone has a low IQ and an even lower reading age we should adjust our expectations of what that person can achieve with help, or let IQ influence how much help is offered? Sim
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1.7.3 Differentiating dyslexia from other developmental conditions

While dyslexia is distinctive, there are other developmental syndromes that often co-occur with it. Examples include:

  • developmental dysphasia – specific difficulties with spoken language

  • attention deficit/hyperactivity disorder – involving particular problems with concentration and/or behaviour

  • developmental dyspraxia – developmental coordination disorder.

Developmental dysphasia

Developm
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1.7.2 Differentiating within dyslexia – acquired versus developmental dyslexia and the search

There has also been continued debate regarding the variability within any dyslexic population, the apparent variety of forms that dyslexia can take. Given the complexity of the skills required to develop fluent reading and spelling perhaps this is not surprising. The variability within dyslexia may simply reflect the fact that this complex process can go wrong in different ways and for different reasons.

The term ‘dyslexia’ was originally used to refer to the acquired dysl
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