Data Communications for Engineers

Written for communications and electronic engineers, technicians and students, this book begins with an introduction to data communications, and goes on to explain the concept of layered communications. Other chapters deal with physical communications channels, baseband digital transmission, analog data transmission, error control and data compression codes, physical layer standards, the data link layer, the higher layers of the protocol hierarchy, and local are networks (LANS). Finally, the book explores some likely future developments.

Children with Special Educational Needs as film makers: Using digital video to support Understandings of Narrative

The literature has identified issues around transitions among phases for all pupils (Cocklin, 1999) including pupils with special educational needs (SEN) (Morgan 1999, Maras and Aveling 2006). These issues include pupils’ uncertainties and worries about building size and spatial orientation, exposure to a range of teaching styles, relationships with peers and older pupils as well as parents’ difficulties in establishing effective communications with prospective secondary schools. Research has also identified that interventions to facilitate these educational transitions should consider managerial support, social and personal familiarisation with the new setting as well as personalised learning strategies (BECTA 2004). However, the role that digital technologies can play in supporting these strategies or facilitating the role of the professionals such as SENCos and heads of departments involved in supporting effective transitions for pupils with SEN has not been widely discussed. Uses of ICT include passing references of student-produced media presentations (Higgins 1993) and use of photographs of activities attached to a timetable to support familiarisation with the secondary curriculum for pupils with autism (Cumine et al. 1998).

Personalized Communications : A Cross Media tool for the future

Personalized communication is when the marketing message is adapted to each individual by using information from a databaseand utilizing it in the various, different media channels available today. That gives the marketer the possibility to create a campaign that cuts through today’s clutter of marketing messages and gets the recipients attention. PODi is a non-profit organization that was started with the aim of contributing knowledge in the field of digital printingtechnologies. They have created a database of case studies showing companies that have successfully implemented personalizedcommunication in their marketing campaigns. The purpose of the project was therefore to analyze PODi case studies with the main objective of finding out if/how successfully the PODi-cases have been and what made them so successful. To collect the data found in the PODi cases the authors did a content analysis with a sample size of 140 PODi cases from the year 2008 to 2010. The study was carried out by analyzing the cases' measurable ways of success: response rate, conversion rate, visited PURL (personalized URL:s) and ROI (Return On Investment). In order to find out if there were any relationships to be found between the measurable result and what type of industry, campaign objective and media vehicle that was used in the campaign, the authors put up different research uestions to explore that. After clustering and merging the collected data the results were found to be quite spread but shows that the averages of response rates, visited PURL and conversion rates were consistently very high. In the study the authors also collected and summarized what the companies themselves claim to be the reasons for success with their marketing campaigns. The resultshows that the creation of a personalized campaign is complex and dependent on many different variables. It is for instance ofgreat importance to have a well thought-out plan with the campaign and to have good data and insights about the customer in order to perform creative personalization. It is also important to make it easy for the recipient to reply, to use several media vehicles for multiple touch points and to have an attractive and clever design.

From the comforts of print to the possibilities of digital media: leading the way in teaching political leadership in a faculty of arts

Since it inception, Deakin University has been committed to the delivery of innovative, high quality course materials to its off campus students. Until recently these packages were predominantly print based, although augmented with audio-visual materials delivered in cassette format. Ironically, with the advent of information and communications technologies (ICT), and some select computer assisted learning and multimedia packages, there was an overall decline in the use of audio and video as important means of enhancing learning. Like many other universities, Deakin has moved to a strong, centralised approach to the provision of its digital and online corporate technology environment. With investment in these technologies has come a renewed interest in the ways in which text and audio-visual materials in digital form can enhance students' learning experiences. Moreover, the ways in which a variety of digital media supported by online developments can create new models and approaches to teaching/learning has figured prominently. This paper presents a case study of how this challenge has been taken up in a unit, Political Leadership, in the Faculty of Arts. The academic teacher's intentions in moving to a completely digital approach are examined along with students' experiences of learning in the subject. Issues are considered from the experience.

e-learning through digital theatre : breaking down the tyranny of distance and limits of location

In this article, we report on a cross-disciplinary, cross-cultural digital exchange project between Australian Drama and Education students and Dutch English Language and Culture students, and examine the impact of the place-independent, technology-mediated communications and collaboration on their learning trajectories. The intensive, intercultural collaboration between the two groups of students resulted in a 50-minute group-devised, digital theatre play entitled Quarter Acre Dreaming. This play, performed through live interactive media by both Dutch and Australian students, traced the historical development of the Australian suburb, while integrating scenes of Dutch immigration into Australia. In the creative process, the students on either side of the globe interacted through Computer-Mediated Communication (CMC), and used videoconferencing and Skype for live rehearsals and discussions to advance their learning of English, their performance repertoire and cross-cultural understanding.

Indigenous communities and new media : questions on the global digital age

Purpose – The purpose of this paper is to look at some of the issues surrounding access to and the use of new media technologies, and questions why this is an area of study that receives a marginal focus in academic work.
Design/methodology/approach – Drawing on previous literature in the area of information and communications technology (ICT) adoption and social exclusion, this paper combines the methodological frameworks adopted by hegemony research and more general studies of new media.
Findings – The paper discusses the impacts of new media use by Indigenous communities, within the framework of discussions about a “global Digital Age”. The paper also briefly looks at the social
implications of new media adoption.
Originality/Value - It questions the assumption that adoption and use of new media is for the "good" or "benefit" of all. It will be of value to researchers of ICT adoption by Indigenous communities.

Research methodologies in creative practice : literacy in the digital age of the twenty first century - learning from computer games

Literacy remains one of the central goals of schooling, but the ways in which it is understood are changing. The growth of the networked society, and the spread of Information and Communications Technologies (ICT), has brought about significant changes to traditional forms of literacy. Older, print based forms now take their place alongside a mix of newer multi-modal forms, where a wide range of elements such as image, sound, movement, light, colour and interactivity often supplant the printed word and contribute to the ways in which meaning is made. For young people to be fully literate in the twenty-first century, they need to have clear understandings about the ways in which these forms of literacy combine to persuade, present a point of view, argue a case or win the viewers’ sympathies. They need to know how to use them themselves, and to be aware of the ways in which others use them. They need to understand how digital texts organise and prioritise knowledge and information, and to recognise and be critically informed about the global context in which this occurs. That is, to be effective members of society, students need to become critical and capable users of both print and multimodal literacy, and be able to bring informed and analytic perspectives to bear on all texts, both print and digital, that they encounter in everyday life.

This is part of schools’ larger challenge to build robust connections between school and the world beyond, to meet the needs of all students, and to counter problems of alienation and marginalisation, particularly amongst students in the middle years. This means finding ways to be relevant and useful for all students, and to provide them with the skills and knowledge they will need in the ICT-based world of the Twentyfirst century. With respect to literacy education, engagement and technology, we urgently need more information as to how this might be best achieved.

E-governance as digital ecosystem : a new way to think about citizen engagement and the internet?

There has been a long history of attempting to deploy networked information and communications – mostly in the form of the Internet – to support the broad goals of effective, efficient and responsible democratic government. While there has been considerable talk about the way such technologies might promote better governance – through increased citizen participation in debates and discussions about future outcomes – there has been, in contrast, much action that actually uses the Internet for more efficient government, by creating online and networked interfaces by which citizens can transact business with government. There has been only limited success in using the Internet and similar communications channels to allow citizens to participate in their own governance. Undoubtedly, the Internet does facilitate public consultation. For example, the European Commission used an Interactive Policy Making web tool for public consultation on legislation for regulation of chemicals. Over 6,500 contributions were received over a period of 2 months and the consultation process led to the identification of key flaws in proposals, saving billions of Euros (Timmers,2008). However, consultation of this kind tends to be a mechanism for gathering opinion and gaining citizen approval for change that is not different except in transmission form than previous approaches based on meetings and written submissions. While the European Commission example can be seen as successful, Internet-based consultation can too easily become promotional or marketing oriented, as in recent efforts in Australian by the Federal Communications Minister to use a blog to discuss proposed changes to Internet censorship regulations: in this case, discussion and debate from participants appears largely to have been ignored in favour of a pre-existing position. This paper aims to provide a solution to some of these problems by drawing on the idea of how the Internet can host and support a digital eco-system.

Navigating 21st century multimodal textual environments : a case study of digital literacy

In the 21st Century young people have the opportunity to create texts that were unimaginable for previous generations. Today’s children live and learn while immersed in a technological world that is fast paced and constantly in a state of change. As technology becomes more and more accessible and specifically marketed to children of the 21st century, educators are challenged to re-consider the literacy skills required to be successfully and safely literate, and the repertoire of literacy pedagogies teacher must have to effectively engage these young people in learning. While there is much evidence to suggest that schools and teachers are not all meeting this challenge, there are some inspiring examples in which schools, communities and teachers are taking up the challenge. This paper presents one case study, which is explored through a 21st century literacy framework that allows us to interpret and analyse the multimodal texts and the processes students use in their creation. Attention is paid to how the case study teacher created meaningful learning experiences and opportunities for them to create and interact within multimodal communications environments, both within and beyond the school.

The Twitter float and free labour : the political economy of digital media

Nick Dyer-Witheford’s Cyber-Marx was published nearly 15 years ago, but there are continuing echoes of its dire promises today. The trends that Dyer-Witheford outlined—the growth of tech-giants in the communications field at the expense of democratic media practices and the radical shedding of jobs in the traditional mass media context—are confirmed by recent events. In November 2013, Twitter launched itself on the public share register, despite having no visible means of financial support, or even much of a business plan. The Twitter IPO tells us a lot about the economy of cyber-capitalism. Aligned to the trend of ‘technological unemployment’ is the rise of what some commentators call ‘digital serfdom’. This is not just growing unemployment, but also drastic under-employment of talented media professionals and an alarming rise in the number of media outlets that want to pay contributors in ‘exposure’, rather than in corporeal, fungible dollars and cents. This articlediscusses these trends and events in the context of the political economy of digital communication.

The promised LAN: the transformative power of information and communications technology in developing countries

Este tese analise as implicações dos investimentos em tecnologia de informação e comunicação (ICT) em países ainda em desenvolvimento, especialmente em termos de educação, para estimular a implementação de uma infra-estrutura mais moderna em vez da continuação do uso de métodos tradicionais. Hoje, como o interesse e os investimentos em ICT estão crescendo rapidamente, os módulos e as idéias que existem para medir o estado de ICT são velhos e inexatos, e não podem ser aplicados às culturas de países em desenvolvimento. Políticos e investidores têm que considerar estes problemas quando estão pensando em investimentos ou socorros para programas em ICT no futuro, e investigadores e professores precisam entender os fatores importantes no desenvolvimento para os ICTs e a educação antes de começar estudos nestes países. Este tese conclue que investimentos em tecnologias móbeis e sem fios ajudarem organizações e governos ultrapassar a infra-estrutura tradicional, estreitando a divisão digital e dando o resulto de educação melhor, alfabetização maior, e soluções sustentáveis pelo desenvolvimento nas comunidades pobres no mundo de países em desenvolvimento.

Mapping digital media: Brazil

The impact of digitization was felt before it could be described and explained. The Mapping Digital Media project is a way of catching up, an ambitious attempt at depicting and understanding the progress and effects of digitization on media and communications systems across the world. The publication of over 50 country reports provides the most comprehensive picture to date on the changes undergone by journalism, news production, and the media as a result of the transition of broadcasting from analog to digital and the advent of the internet. These extensive reports, all sharing the same structure, cover issues such as media consumption, public media, changes in journalism, digital activism, new regulation, and business models. Reports have been published from nine Latin American countries: Mexico, Argentina, Colombia, Peru, Chile, Brazil, Guatemala, Nicaragua, and Uruguay. Given the recent evolution of Brazil’s media landscape and regulation, and its position as a regional reference, few reports have generated as much expectation as the Brazilian one. This excellent text is key to understanding digitization in Brazil, in Latin America, and in the world at large.

Uma fonte chaveada de 50kW com correção de fator de potência para alimentação de uma tocha de plasma Indutiva utilizando técnicas de controle digital

This work deals with the development of an experimental study on a power supply of high frequency that provides the toch plasmica to be implemented in PLASPETRO project, which consists of two static converters developed by using Insulated Gate Bipolar Transistor (IGBT). The drivers used to control these keys are triggered by Digital Signal Processor (DSP) through optical fibers to reduce problems with electromagnetic interference (EMI). The first stage consists of a pre-regulator in the form of an AC to DC converter with three-phase boost power factor correction which is the main theme of this work, while the second is the source of high frequency itself. A series-resonant inverter consists of four (4) cell inverters operating in a frequency around 115 kHz each one in soft switching mode, alternating itself to supply the load (plasma torch) an alternating current with a frequency of 450 kHz. The first stage has the function of providing the series-resonant inverter a DC voltage, with the value controlled from the power supply provided by the electrical system of the utility, and correct the power factor of the system as a whole. This level of DC bus voltage at the output of the first stage will be used to control the power transferred by the inverter to the load, and it may vary from 550 VDC to a maximum of 800 VDC. To control the voltage level of DC bus driver used a proportional integral (PI) controller and to achieve the unity power factor it was used two other proportional integral currents controllers. Computational simulations were performed to assist in sizing and forecasting performance. All the control and communications needed to stage supervisory were implemented on a DSP

Frequency synthesizer using a hybrid analog/digital loop filter: A low complexity approach

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)