6.6 ZigBee

Development of the ZigBee standard is the result of a group of interested parties coming together to form the ZigBee Alliance. When approved it will be an open standard sitting within a subset of the IEEE 802.15.4 low-data wireless standard. At the outset ZigBee was designed specifically for networks set up for the purposes of monitoring and control. Two of the major development aims were that it should be low cost (so that it is cheap to install and maintain), and low power (for long battery
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5.2 Comparing WiFi and Bluetooth

Activity 20: self-assessment

4.8 WiFi – a summary

Activity 18: self-assessment

To test your understanding of what you have read so far about WiFi, say whether each of the statements below is true or false.

  1. In ad hoc mode, WiFi stations are connect
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5.2 Electronic kitchen scales

A set of electronic kitchen scales is shown in Figure 7. Their basic operation is relatively simple. When they are switched on and, for example, a 500-gram object is placed in the scalepan, the display shows the digits 500 and the letter g.

2.1 Processors

Figure 2 shows an advertisement for a personal computer (PC) published in February 2004. The main features of the computer are listed in this advert. The first item on the list is ‘Intel® Pentium® 4 Processor 2.80 GHz’. So this computer uses an Intel Pentium 4 Processor, running at
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4.2.1 Introduction

Netiquette is the unwritten rules of good behaviour online. Although the principles are similar to face-to-face conversation, the limitations of a text-based medium mean you have to learn new techniques. Other people can't see the expression on your face or hear your voice, so it is what you write that sets the tone of the conversation.


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8.3 Entities

Here is the definition of an entity.

An entity represents a thing that has meaning in a given context and about which there is a need to record data.

A data model is not concerned with the individual entities. Instead, it describes particular types of entity. For example, all students are represented by the same types of data (student identifier, name, whether or not registere
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5.2 An example

In order to complete this section I shall present a simple example. This is loosely based on one described in [1], currently one of the very few books written on JavaSpaces technology.

An object that can be stored in a space has to implement an interface . The objects that form part of the example will just
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7.2.11 Dynamic pricing

The dynamic pricing model is one which has a number of different instantiations. Basically, such models treat the price of a product or service (primarily a product) as variable and open to negotiation.

The name-your-price instantiation of this model is where the customer of a site offers the price that he or she thinks is reasonable for a product or service. The administrator of the website will pass on this bid to the provider of the product or service who will decide whether t
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2.1 An example – supply chain management

Before looking at the wide variety of e-commerce application areas that have flourished over the last decade in more detail, it is worth looking at one which may not be familiar to a reader, but which saves companies huge amounts of resources. The application involves a supply chain. A supply chain is a set of relationships between a number of companies who have a symbiotic relationship with each other in that one company supplies commodities or services to other companies which, in tu
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1.2 Commerce and the internet

There are a number of ways in which companies can make money from the internet. Probably the best known way of making money is by selling some commodity; this could be a non-IT commodity such as a CD or item of clothing or it could be some piece of application software, a font, a browser plug-in or an operating system. Other forms of revenue raising are:

  • Auction sites which auction items on the internet and make profits by taking some commissi
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5.1.2 The human genome

All life is ‘encoded’ chemically in genes. What this means is that the structure of an organism, the organs it possesses, its colouring, and so on are all determined by different genes. A very simple organism may have just a few genes, and a complex one tens of thousands. The ‘map’ of an organism's genes is referred to as its genome. It shows, in essence, which genes give rise to which characteristics or traits of the organism. The word ‘template’ would describe the
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4.1.2 Geographical data

Modern maps are now mostly assembled by computers using very large collections of geographical data, such as latitude, longitude, altitude, roads and towns. Collections of data like this (stored in databases) aim to eliminate the need to duplicate data. The data in databases is described in symbols that the computer can handle, i.e. numbers. Even the names of features are symbolised using numbers.

If I were trying to tell you the way to a particular street in a town, using only t
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Introduction

This course explores school geography, focusing upon how geography is currently being taught and understood. While studying this course you will read about the significance of geography as a subject, considering what are the defining concepts for school geography and its educational value. The course also includes a lesson plan and a look at definitions of geography as a medium of education.

Find out more about studying with The Open University by
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Working with charts, graphs and tables
Your course might not include any maths or technical content but, at some point during your course, it’s likely that you’ll come across information represented in charts, graphs and tables. You’ll be expected to know how to interpret this information. This unit will help you to develop the skills you need to do this. This unit can be used in conjunction with the ‘More working with charts, graphs and tables’ unit, which looks into more ways to present statistical information and shows y
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Introduction

School governors need to be involved in the monitoring and evaluation of secondary schools. But what areas should you be monitoring and how can you ensure that monitoring is effective. This course will help you assess these matters and also look at the kind of evidence you should be sourcing, and how that evidence should be evaluated.

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

Introduction

This course introduces you to the concepts of:

  • open educational resources (OERs)
  • issues involved in the creation, use and re-use, and pedagogy of OERs
  • a range of tools and media to support you in developing your own teaching and learning practices.

It will provide you with the skills and confidence to engage in further OER work as both creator and user.

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Copyright © 2016 The Open University

Am I ready to study in English?
Even if you feel confident using English in everyday situations, studying in English at higher education level might present extra challenges. This free course, Am I ready to study in English?, provides an opportunity for you to reflect on your English language skills through a series of academic exercises. First published on
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This free course, The 'why' and 'what' of educational leadership and management, introduces you to researching educational leadership and management and how undertaking research can contribute to both good practice and the building of leadership capacity. First published on Wed, 17 Feb 2016 as Author(s): Creator not set

Understanding early years environments and children’s spaces
This unit considers some of the different environments children encounter in their early years. It encourages you to develop your reflection of children’s environments and provides opportunities for you to investigate and evaluate young children’s experiences and your role in supporting them. First published
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