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Inter-Asterisk Exchange (Iax): Deployment Scenarios in Sip-Enabled Networks

Find out how IAX can complement SIP to overcome complications encountered in current SIP-based communications Written by an expert in the field of telecommunications, this book describes the Inter-Asterisk Exchange protocol (IAX) and its operations, discussing the main characteristics of the protocol including NAT traversal, security, IPv6 support, interworking between IPv4 and IPv6, interworking with SIP and many others. The author presents the ways in which IAX can be activated so as to avoid complications such as NAT and the presence of intermediary boxes in operational architectures. This book analytically demonstrates the added values of IAX protocol compared to existing ones, while proposing viable deployment scenarios that assess the behavior of the protocol in operational networks. Key Features: * Promotes a viable alternative protocol to ease deployment of multimedia services * Analyses the capabilities of the IAX protocol and its ability to meet VoIP service provider requirements, and provides scenarios of introducing IAX within operational architectures * Addresses the advantages and disadvantages of SIP, and Details the features of IAX that can help, in junction with SIP, to overcome various disadvantages of SIP * Explores the added values of IAX protocol compared to existing protocols * Discusses the compatibility of new adopted architectures and associated protocols This book will be a valuable reference for service providers, protocol designers, vendors and service implementers. Lecturers and advanced students computer science, electrical engineering and telecoms courses will also find this book of interest.

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Price: 138.99 EUR excl. shipping

The Return of Inequality

A pioneering book that takes us beyond economic debate to show how inequality is returning us to a past dominated by empires, dynastic elites, and ethnic divisions. The economic facts of inequality are clear. The rich have been pulling away from the rest of us for years, and the super-rich have been pulling away from the rich. More and more assets are concentrated in fewer and fewer hands. Mainstream economists say we need not worry; what matters is growth, not distribution. In The Return of Inequality, acclaimed sociologist Mike Savage pushes back, explaining inequality's profound deleterious effects on the shape of societies. Savage shows how economic inequality aggravates cultural, social, and political conflicts, challenging the coherence of liberal democratic nation-states. Put simply, severe inequality returns us to the past. By fracturing social bonds and harnessing the democratic process to the strategies of a resurgent aristocracy of the wealthy, inequality revives political conditions we thought we had moved beyond: empires and dynastic elites, explosive ethnic division, and metropolitan dominance that consigns all but a few cities to irrelevance. Inequality, in short, threatens to return us to the very history we have been trying to escape since the Age of Revolution. Westerners have been slow to appreciate that inequality undermines the very foundations of liberal democracy: faith in progress and trust in the political community's concern for all its members. Savage guides us through the ideas of leading theorists of inequality, including Marx, Bourdieu, and Piketty, revealing how inequality reimposes the burdens of the past. At once analytically rigorous and passionately argued, The Return of Inequality is a vital addition to one of our most important public debates.

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Price: 27.99 EUR excl. shipping

Children's Interests, Inquiries and Identities (eBook, ePUB)

Children's curiosity about their lives and worlds motivates many interests. Yet, adults often have fixed ideas about what children's interests are and have been criticised for trivialising children's interests. This book offers a critical and accessible engagement with research on children's interests that challenges us to move beyond surface-level understandings. Children's Interests, Inquiries and Identities argues that the powerful relationship between interests and informal learning has been under-recognised and undervalued. The book proposes new principles for understanding children's learning. It provides evidence that we need to look beyond the activities or topics children may currently be selecting to find out who and what has stimulated their interests, how we might identify and interpret interests more analytically and deeply, and how we might respond and engage with these in ways that take children's interests seriously. Moving beyond play-based activities, Helen Hedges explains and illustrates a number of ways by which children's interests can be interpreted and understood, to get to the heart of what really matters to, and for, children. The book draws on examples from research with children aged under 5 years, and young adults aged 18-25. It also includes a chapter on teachers' interests. It presents new and original models for interests-based curriculum and sociocultural curriculum and pedagogy for future examination in research and practice. This book demonstrates that leaving behind long-standing, taken-for-granted practices that have influenced understandings of curriculum, pedagogy, learning, and outcomes allows a new perspective of children's interests to emerge. It will be of interest to researchers, postgraduate students, and practitioners in the early years, parents, and other professionals who work with young children.

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Price: 29.95 EUR excl. shipping

Children's Interests, Inquiries and Identities (eBook, PDF)

Children's curiosity about their lives and worlds motivates many interests. Yet, adults often have fixed ideas about what children's interests are and have been criticised for trivialising children's interests. This book offers a critical and accessible engagement with research on children's interests that challenges us to move beyond surface-level understandings. Children's Interests, Inquiries and Identities argues that the powerful relationship between interests and informal learning has been under-recognised and undervalued. The book proposes new principles for understanding children's learning. It provides evidence that we need to look beyond the activities or topics children may currently be selecting to find out who and what has stimulated their interests, how we might identify and interpret interests more analytically and deeply, and how we might respond and engage with these in ways that take children's interests seriously. Moving beyond play-based activities, Helen Hedges explains and illustrates a number of ways by which children's interests can be interpreted and understood, to get to the heart of what really matters to, and for, children. The book draws on examples from research with children aged under 5 years, and young adults aged 18-25. It also includes a chapter on teachers' interests. It presents new and original models for interests-based curriculum and sociocultural curriculum and pedagogy for future examination in research and practice. This book demonstrates that leaving behind long-standing, taken-for-granted practices that have influenced understandings of curriculum, pedagogy, learning, and outcomes allows a new perspective of children's interests to emerge. It will be of interest to researchers, postgraduate students, and practitioners in the early years, parents, and other professionals who work with young children.

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Price: 29.95 EUR excl. shipping

High Voltage and Electrical Insulation Engineering

High Voltage and Electrical Insulation Engineering A comprehensive graduate-level textbook on high voltage insulation engineering, updated to reflect emerging trends and techniques in the field High Voltage and Electrical Insulation Engineering presents systematic coverage of the behavior of dielectric materials. This classic textbook opens with clear explanations of fundamental terminology, electric-field classification, and field estimation techniques. Subsequent chapters describe the field dependent performance of gaseous, vacuum, liquid, and solid dielectrics under different classified field conditions, and illustrate the monitoring of electrical insulation conditions by both single and continuous online methods. Throughout the text, numerous tables, figures, diagrams, and images are provided to strengthen understanding of all material. Fully revised to incorporate the most current technological application techniques, the second edition offers an entirely new section on condition monitoring of electrical insulation. Updated chapters discuss recent developments in gas-filled power apparatus, present-day trends in the use replacement of liquid insulating materials, the latest applications of new solid dielectrics in high voltage engineering, vacuum technology and liquid insulating materials, and more. This edition features a brand-new case study exploring the estimation of clearance requirements for 25 kV electric traction. Readers will also find the new edition: * Provides new coverage of advances in the field, such as the application of polymer insulators and the use of SF6 gas and its mixtures in gas-insulated systems/substations (GIS) * Uses a novel approach that explores the field dependent behavior of dielectrics * Explains the "weakly nonuniform field," a unique concept introduced both conceptually and analytically in Germany * A separate chapter provides the new approach to the mechanism of lightning phenomenon, which also includes the phenomenon of "Ball Lightning" * The dielectric properties of vacuum and the development in the application of vacuum technology in power circuit breakers is covered in an exclusive chapter * In-depth coverage of the performance of the sulphur-hexafluoride gas and its mixtures applicable to the design of Gas Insulated Systems including dry power transformers High Voltage and Electrical Insulation Engineering, Second Edition, remains the perfect textbook for graduate students, teachers, academic researchers, and utility and power industry engineers and scientists involved in the field.

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Price: 123.99 EUR excl. shipping