17 research outputs found

    Using lambda networks to enhance performance of interactive large simulations

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    The ability to use a visualisation tool to steer large simulations provides innovative and novel usage scenarios, e.g. the ability to use new algorithms for the computation of free energy profiles along a nanopore [1]. However, we find that the performance of interactive simulations is sensitive to the quality of service of the network with variable latency and packet loss in particular having a detrimental effect The use of dedicated networks (provisioned in this case as a circuit-switched point-to-point optical lightpath or lambda) can lead to significant (50% or more) performance enhancement, When funning on say 128 or 256 processors of a high-end supercomputer this saving has a significant value. We perform experiments to understand the impact of network characteristics on the performance of a large parallel classical molecular dynamics simulation when coupled interactively to a remote visualisation tool. This paper discusses the experiments performed and presents the results from the systematic studies. © 2006 IEEE.Published versio

    Verification of Concurrent Systems : optimality, Scalability and Applicability

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    Tesis inédita de la Universidad Complutense de Madrid, Facultad de Informåtica, leída el 14-10-2020Tanto el testing como la verificacion de sistemas concurrentes requieren explorar todos los posibles entrelazados no deterministas que la ejecucion concurrente puede tener, ya que cualquiera de estos entrelazados podra revelar un comportamiento erroneo del sistema. Esto introduce una explosion combinatoria en el numero de estados del programa que deben ser considerados, lo que frecuentemente lleva a un problema computacionalmente intratable. El objetivo de esta tesis es el desarrollo de tecnicas novedosas para el testing y la verificacion de programas concurrentes que permitan reducir esta explosion combinatoria...Both verification and testing of concurrent systems require exploring all possible non-deterministic interleavings that the concurrent execution may have, as any of the interleavings may reveal an erroneous behavior of the system. This introduces a combinatorial explosion on the number of program states that must be considered, what leads often to a computationally intractable problem. The overall goal of this thesis is to investigate novel techniques for testing and verification of concurrent programs that reduce this combinatorial explosion...Fac. de InformåticaTRUEunpu

    Blown to Bits: Your Life, Liberty, and Happiness After the Digital Explosion

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    382 p.Libro ElectrónicoEach of us has been in the computing field for more than 40 years. The book is the product of a lifetime of observing and participating in the changes it has brought. Each of us has been both a teacher and a learner in the field. This book emerged from a general education course we have taught at Harvard, but it is not a textbook. We wrote this book to share what wisdom we have with as many people as we can reach. We try to paint a big picture, with dozens of illuminating anecdotes as the brushstrokes. We aim to entertain you at the same time as we provoke your thinking.Preface Chapter 1 Digital Explosion Why Is It Happening, and What Is at Stake? The Explosion of Bits, and Everything Else The Koans of Bits Good and Ill, Promise and Peril Chapter 2 Naked in the Sunlight Privacy Lost, Privacy Abandoned 1984 Is Here, and We Like It Footprints and Fingerprints Why We Lost Our Privacy, or Gave It Away Little Brother Is Watching Big Brother, Abroad and in the U.S. Technology Change and Lifestyle Change Beyond Privacy Chapter 3 Ghosts in the Machine Secrets and Surprises of Electronic Documents What You See Is Not What the Computer Knows Representation, Reality, and Illusion Hiding Information in Images The Scary Secrets of Old Disks Chapter 4 Needles in the Haystack Google and Other Brokers in the Bits Bazaar Found After Seventy Years The Library and the Bazaar The Fall of Hierarchy It Matters How It Works Who Pays, and for What? Search Is Power You Searched for WHAT? Tracking Searches Regulating or Replacing the Brokers Chapter 5 Secret Bits How Codes Became Unbreakable Encryption in the Hands of Terrorists, and Everyone Else Historical Cryptography Lessons for the Internet Age Secrecy Changes Forever Cryptography for Everyone Cryptography Unsettled Chapter 6 Balance Toppled Who Owns the Bits? Automated Crimes—Automated Justice NET Act Makes Sharing a Crime The Peer-to-Peer Upheaval Sharing Goes Decentralized Authorized Use Only Forbidden Technology Copyright Koyaanisqatsi: Life Out of Balance The Limits of Property Chapter 7 You Can’t Say That on the Internet Guarding the Frontiers of Digital Expression Do You Know Where Your Child Is on the Web Tonight? Metaphors for Something Unlike Anything Else Publisher or Distributor? Neither Liberty nor Security The Nastiest Place on Earth The Most Participatory Form of Mass Speech Protecting Good Samaritans—and a Few Bad Ones Laws of Unintended Consequences Can the Internet Be Like a Magazine Store? Let Your Fingers Do the Stalking Like an Annoying Telephone Call? Digital Protection, Digital Censorship—and Self-Censorship Chapter 8 Bits in the Air Old Metaphors, New Technologies, and Free Speech Censoring the President How Broadcasting Became Regulated The Path to Spectrum Deregulation What Does the Future Hold for Radio? Conclusion After the Explosion Bits Lighting Up the World A Few Bits in Conclusion Appendix The Internet as System and Spirit The Internet as a Communication System The Internet Spirit Endnotes Inde

    Data Hiding and Its Applications

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    Data hiding techniques have been widely used to provide copyright protection, data integrity, covert communication, non-repudiation, and authentication, among other applications. In the context of the increased dissemination and distribution of multimedia content over the internet, data hiding methods, such as digital watermarking and steganography, are becoming increasingly relevant in providing multimedia security. The goal of this book is to focus on the improvement of data hiding algorithms and their different applications (both traditional and emerging), bringing together researchers and practitioners from different research fields, including data hiding, signal processing, cryptography, and information theory, among others

    Sharp Cut: Harold Pinter\u27s Screenplays and the Artistic Process

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    Best known as one of the most important playwrights of the twentieth century, Harold Pinter has also written many highly regarded screenplays, including Academy Award-nominated screenplays for The French Lieutenant’s Woman and Betrayal , collaborations with English director Joseph Losey, and an unproduced script for the remake of Stanley Kubrick’s 1962 adaptation of Lolita . In this definitive study of Pinter’s screenplays, Steven H. Gale compares the scripts with their sources and the resulting films, analyzes their stages of development, and shows how Pinter creates unique works of art by extracting the essence from his source and rendering it in cinematic terms. Gale introduces each film, traces the events that led to the script’s writing, examines critical reaction to the film, and provides an extensive bibliography, appendices, and an index. A highly significant book both for Pinter studies and for the neglected analysis of the genre of film scripts. . . . This pioneering work will be a model for subsequent studies of film scripts. -- Choice To say that [Steven Gale] is a master of the scholarship on Harold Pinter is an understatement
.I have seldom agreed so much with an author’s interpretations of a film artist as I do with [Gale’s]
.This is a landmark in scholarship about the adaptation of fiction and drama to film by an author who know his subject (in both senses of the word) inside out. In particular he documents the collaboration of Harold Printer with film director Joseph Losey, which is one of the most celebrated creative associations of a writer and director in cinema history. -- Gene D. Phillips Such a volume was refreshing to read and gave me faith in scholarship—again. -- Peter C. Rollins Named a Choice 2003 Academic Title.https://uknowledge.uky.edu/upk_english_language_and_literature_british_isles/1006/thumbnail.jp

    Back to the drawing board? : exploring process drawing and pathways to drawing participation in higher education for graphic design students

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    “I can’t draw”. “Idon’tdraw.” While facilitating my first brainstorming session with undergraduate Visual Communication, Designstudents at Western Sydney University (WSU), I was struck by the absence of any drawing activity in the classroom. Technological innovations have significantly reduced the role of drawing in the design process since the mid-eighties; however, research confirms sketching, or indeed any form of hand-eye coordination provides valuable cognitive and communication functions in the creative process. The ambiguous nature of a freehand sketch allows for creative interpretation, encourages ‘fluency’ and iteration, and provides a ‘thinking trail’ for evaluation. The physical act of drawing can also aid concentration and memory. Many professional designers recognise process drawing as a vital ingredient in their creative thinking processes and those of new graduates. Through a literature review and reflection on my creative practices, this thesis identifies the benefits of process drawing to think, create, communicate and collaboratein the design process. So, if drawing is so useful, why don’t design students use rough sketches and thumbnails in the classroom?Through a practice-led enquiry, I reflect on observations made as both “insider” and “outsider” within my communities of practice. As a professional design practitioner, visual artist, teacher and researcher, I investigate the role and value of process drawing in the twenty-first-century classroom.The attitudes, behaviours and ‘designerly’practices of WSU design students are explored through a multiple-choiceWhy draw?questionnaireconducted over six years.The interviews and group discussions with final-year, high achievingWSU designstudents help clarify the creative thinking practicesof these participants and identify possible barriers to wider drawing participation. The observations,interpretation of theliterature and questionnaire and interview findings underpin the studio exploration into possible pathways to foster drawing participationin the classroom. ASpeed Squigglingactivity was designed to demonstrate the value of drawing and to encouragedivergent thinking, iteration, creative flow, and design thinking skills. APre-and Post-Why draw?questionnaire was collected from second-year WSU Design students before and after theSpeed Squigglingtrial. An analysis of students’ written and visual responses explores the effectiveness of this kind of drawing activity to encourage and foster drawing participation.Back to the drawing board?adds to the critical discourse in drawing research and design education that argues process drawing has an important role to play in the twenty-first century classroom and should continue to be clarified, demonstrated and encouraged in design education

    What Photographs Do

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    What are photographs ‘doing’ in museums? Why are some photographs valued and others not? Why are some photographic practices visible and not others? What value systems and hierarchies do they reflect? What Photographs Do explores how museums are defined through their photographic practices. It focuses not on formal collections of photographs as accessioned objects, be they ‘fine art’ or ‘archival’, but on what might be termed ‘non-collections’: the huge number of photographs that are integral to the workings of museums yet ‘invisible’, existing outside the structures of ‘the collection’. These photographs, however, raise complex and ambiguous questions about the ways in which such accumulations of photographs create the values, hierarchies, histories and knowledge-systems, through multiple, folded and overlapping layers that might be described as the museum’s ecosystem. These photographic dynamics are studied through the prism of the Victoria and Albert Museum, London, an institution with over 150 years' engagement with photography’s multifaceted uses and existences in the museum. The book differs from more usual approaches to museum studies in that it presents not only formal essays but short ‘auto-ethnographic’ interventions from museum practitioners, from studio photographers and image managers to conservators and non-photographic curators, who address the significance of both historical and contemporary practices of photography in their work. As such this book offers an extensive and unique range of accounts of what photographs ‘do’ in museums, expanding the critical discourse of both photography and museums

    What Photographs Do

    Get PDF
    What are photographs ‘doing’ in museums? Why are some photographs valued and others not? Why are some photographic practices visible and not others? What value systems and hierarchies do they reflect? What Photographs Do explores how museums are defined through their photographic practices. It focuses not on formal collections of photographs as accessioned objects, be they ‘fine art’ or ‘archival’, but on what might be termed ‘non-collections’: the huge number of photographs that are integral to the workings of museums yet ‘invisible’, existing outside the structures of ‘the collection’. These photographs, however, raise complex and ambiguous questions about the ways in which such accumulations of photographs create the values, hierarchies, histories and knowledge-systems, through multiple, folded and overlapping layers that might be described as the museum’s ecosystem. These photographic dynamics are studied through the prism of the Victoria and Albert Museum, London, an institution with over 150 years' engagement with photography’s multifaceted uses and existences in the museum. The book differs from more usual approaches to museum studies in that it presents not only formal essays but short ‘auto-ethnographic’ interventions from museum practitioners, from studio photographers and image managers to conservators and non-photographic curators, who address the significance of both historical and contemporary practices of photography in their work. As such this book offers an extensive and unique range of accounts of what photographs ‘do’ in museums, expanding the critical discourse of both photography and museums
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