259 research outputs found

    Exhibiting the Past

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    With respect to public issues, history matters. With the worldwide interest for historical issues related with gender, religion, race, nation, and identity, public history is becoming the strongest branch of academic history. This volume brings together the contributions from historians of education about their engagement with public history, ranging from musealisation and alternative ways of exhibiting to new ways of storytelling

    Bitstream-based video quality modeling and analysis of HTTP-based adaptive streaming

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    Die Verbreitung erschwinglicher Videoaufnahmetechnologie und verbesserte Internetbandbreiten ermöglichen das Streaming von hochwertigen Videos (Auflösungen > 1080p, Bildwiederholraten ≥ 60fps) online. HTTP-basiertes adaptives Streaming ist die bevorzugte Methode zum Streamen von Videos, bei der Videoparameter an die verfügbare Bandbreite angepasst wird, was sich auf die Videoqualität auswirkt. Adaptives Streaming reduziert Videowiedergabeunterbrechnungen aufgrund geringer Netzwerkbandbreite, wirken sich jedoch auf die wahrgenommene Qualität aus, weswegen eine systematische Bewertung dieser notwendig ist. Diese Bewertung erfolgt üblicherweise für kurze Abschnitte von wenige Sekunden und während einer Sitzung (bis zu mehreren Minuten). Diese Arbeit untersucht beide Aspekte mithilfe perzeptiver und instrumenteller Methoden. Die perzeptive Bewertung der kurzfristigen Videoqualität umfasst eine Reihe von Labortests, die in frei verfügbaren Datensätzen publiziert wurden. Die Qualität von längeren Sitzungen wurde in Labortests mit menschlichen Betrachtern bewertet, die reale Betrachtungsszenarien simulieren. Die Methodik wurde zusätzlich außerhalb des Labors für die Bewertung der kurzfristigen Videoqualität und der Gesamtqualität untersucht, um alternative Ansätze für die perzeptive Qualitätsbewertung zu erforschen. Die instrumentelle Qualitätsevaluierung wurde anhand von bitstrom- und hybriden pixelbasierten Videoqualitätsmodellen durchgeführt, die im Zuge dieser Arbeit entwickelt wurden. Dazu wurde die Modellreihe AVQBits entwickelt, die auf den Labortestergebnissen basieren. Es wurden vier verschiedene Modellvarianten von AVQBits mit verschiedenen Inputinformationen erstellt: Mode 3, Mode 1, Mode 0 und Hybrid Mode 0. Die Modellvarianten wurden untersucht und schneiden besser oder gleichwertig zu anderen aktuellen Modellen ab. Diese Modelle wurden auch auf 360°- und Gaming-Videos, HFR-Inhalte und Bilder angewendet. Darüber hinaus wird ein Langzeitintegrationsmodell (1 - 5 Minuten) auf der Grundlage des ITU-T-P.1203.3-Modells präsentiert, das die verschiedenen Varianten von AVQBits mit sekündigen Qualitätswerten als Videoqualitätskomponente des vorgeschlagenen Langzeitintegrationsmodells verwendet. Alle AVQBits-Varianten, das Langzeitintegrationsmodul und die perzeptiven Testdaten wurden frei zugänglich gemacht, um weitere Forschung zu ermöglichen.The pervasion of affordable capture technology and increased internet bandwidth allows high-quality videos (resolutions > 1080p, framerates ≥ 60fps) to be streamed online. HTTP-based adaptive streaming is the preferred method for streaming videos, adjusting video quality based on available bandwidth. Although adaptive streaming reduces the occurrences of video playout being stopped (called “stalling”) due to narrow network bandwidth, the automatic adaptation has an impact on the quality perceived by the user, which results in the need to systematically assess the perceived quality. Such an evaluation is usually done on a short-term (few seconds) and overall session basis (up to several minutes). In this thesis, both these aspects are assessed using subjective and instrumental methods. The subjective assessment of short-term video quality consists of a series of lab-based video quality tests that have resulted in publicly available datasets. The overall integral quality was subjectively assessed in lab tests with human viewers mimicking a real-life viewing scenario. In addition to the lab tests, the out-of-the-lab test method was investigated for both short-term video quality and overall session quality assessment to explore the possibility of alternative approaches for subjective quality assessment. The instrumental method of quality evaluation was addressed in terms of bitstream- and hybrid pixel-based video quality models developed as part of this thesis. For this, a family of models, namely AVQBits has been conceived using the results of the lab tests as ground truth. Based on the available input information, four different instances of AVQBits, that is, a Mode 3, a Mode 1, a Mode 0, and a Hybrid Mode 0 model are presented. The model instances have been evaluated and they perform better or on par with other state-of-the-art models. These models have further been applied to 360° and gaming videos, HFR content, and images. Also, a long-term integration (1 - 5 mins) model based on the ITU-T P.1203.3 model is presented. In this work, the different instances of AVQBits with the per-1-sec scores output are employed as the video quality component of the proposed long-term integration model. All AVQBits variants as well as the long-term integration module and the subjective test data are made publicly available for further research

    YEARBOOK 2019/2020. Arts Museology and Curatorship

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    Yearbook is the first collection of AMaC’s student projects developed during the first two years of the course. AMaC is a Master’s degree in Arts, Museology and Curatorship with a clear mission: to educate and train professionals with creative and research skills essential to developing successful arts and cultural heritage strategies. This broad and demanding field requires an engagement with the current debate on common goods, the identity of communities, access to heritage art, and the impact of the arts on society

    Fundamentals

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    Volume 1 establishes the foundations of this new field. It goes through all the steps from data collection, their summary and clustering, to different aspects of resource-aware learning, i.e., hardware, memory, energy, and communication awareness. Machine learning methods are inspected with respect to resource requirements and how to enhance scalability on diverse computing architectures ranging from embedded systems to large computing clusters

    LIPIcs, Volume 258, SoCG 2023, Complete Volume

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    LIPIcs, Volume 258, SoCG 2023, Complete Volum

    Lockdown Cultures

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    Lockdown Cultures is both a cultural response to our extraordinary times and a manifesto for the arts and humanities and their role in our post-pandemic society. This book offers a unique response to the question of how the humanities commented on and were impacted by one of the dominant crises of our times: the Covid-19 pandemic. While the role of engineers, epidemiologists and, of course, medics is assumed, Lockdown Cultures illustrates some of the ways in which the humanities understood and analysed 2020–21, the year of lockdown and plague. Though the impulse behind the book was topical, underpinning the richly varied and individual essays is a lasting concern with the value of the humanities in the twenty-first century. Each contributor approaches this differently but there are two dominant strands: how art and culture can help us understand the Covid crisis; and how the value of the humanities can be demonstrated by engaging with cultural products from the past. The result is a book that serves as testament to the humanities’ reinvigorated and reforged sense of identity, from the perspective of UCL and one of the leading arts and humanities faculties in the world. It bears witness to a globally impactful event while showcasing interdisciplinary thinking and examining how the pandemic has changed how we read, watch, write and educate. More than thirty individual contributions collectively reassert the importance of the arts and humanities for contemporary society

    The Post-Screen Through Virtual Reality, Holograms and Light Projections

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    Screens are ubiquitous today. They display information; present image worlds; are portable; connect to mobile networks; mesmerize. However, contemporary screen media also seek to eliminate the presence of the screen and the visibilities of its boundaries. As what is image becomes increasingly indistinguishable against the viewer’s actual surroundings, this unsettling prompts re-examination about not only what is the screen, but also how the screen demarcates and what it stands for in relation to our understanding of our realities in, outside and against images. Through case studies drawn from three media technologies – Virtual Reality; holograms; and light projections – this book develops new theories of the surfaces on and spaces in which images are displayed today, interrogating critical lines between art and life; virtuality and actuality; truth and lies. What we have today is not just the contestation of the real against illusion or the unreal, but the disappearance itself of difference and a gluttony of the unreal which both connect up to current politics of distorted truth values and corrupted terms of information. The Post-Screen Through Virtual Reality, Holograms and Light Projections: Where Screen Boundaries Lie is thus about not only where the image’s borders and demarcations are established, but also the screen boundary as the instrumentation of today’s intense virtualizations that do not tell the truth. In all this, a new imagination for images emerges, with a new space for cultures of presence and absence, definitions of object and representation, and understandings of dis- and re-placement – the post-screen

    Understanding Quantum Technologies 2022

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    Understanding Quantum Technologies 2022 is a creative-commons ebook that provides a unique 360 degrees overview of quantum technologies from science and technology to geopolitical and societal issues. It covers quantum physics history, quantum physics 101, gate-based quantum computing, quantum computing engineering (including quantum error corrections and quantum computing energetics), quantum computing hardware (all qubit types, including quantum annealing and quantum simulation paradigms, history, science, research, implementation and vendors), quantum enabling technologies (cryogenics, control electronics, photonics, components fabs, raw materials), quantum computing algorithms, software development tools and use cases, unconventional computing (potential alternatives to quantum and classical computing), quantum telecommunications and cryptography, quantum sensing, quantum technologies around the world, quantum technologies societal impact and even quantum fake sciences. The main audience are computer science engineers, developers and IT specialists as well as quantum scientists and students who want to acquire a global view of how quantum technologies work, and particularly quantum computing. This version is an extensive update to the 2021 edition published in October 2021.Comment: 1132 pages, 920 figures, Letter forma

    Energy Data Analytics for Smart Meter Data

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    The principal advantage of smart electricity meters is their ability to transfer digitized electricity consumption data to remote processing systems. The data collected by these devices make the realization of many novel use cases possible, providing benefits to electricity providers and customers alike. This book includes 14 research articles that explore and exploit the information content of smart meter data, and provides insights into the realization of new digital solutions and services that support the transition towards a sustainable energy system. This volume has been edited by Andreas Reinhardt, head of the Energy Informatics research group at Technische Universität Clausthal, Germany, and Lucas Pereira, research fellow at Técnico Lisboa, Portugal
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