6,102 research outputs found
The Metaverse: Survey, Trends, Novel Pipeline Ecosystem & Future Directions
The Metaverse offers a second world beyond reality, where boundaries are
non-existent, and possibilities are endless through engagement and immersive
experiences using the virtual reality (VR) technology. Many disciplines can
benefit from the advancement of the Metaverse when accurately developed,
including the fields of technology, gaming, education, art, and culture.
Nevertheless, developing the Metaverse environment to its full potential is an
ambiguous task that needs proper guidance and directions. Existing surveys on
the Metaverse focus only on a specific aspect and discipline of the Metaverse
and lack a holistic view of the entire process. To this end, a more holistic,
multi-disciplinary, in-depth, and academic and industry-oriented review is
required to provide a thorough study of the Metaverse development pipeline. To
address these issues, we present in this survey a novel multi-layered pipeline
ecosystem composed of (1) the Metaverse computing, networking, communications
and hardware infrastructure, (2) environment digitization, and (3) user
interactions. For every layer, we discuss the components that detail the steps
of its development. Also, for each of these components, we examine the impact
of a set of enabling technologies and empowering domains (e.g., Artificial
Intelligence, Security & Privacy, Blockchain, Business, Ethics, and Social) on
its advancement. In addition, we explain the importance of these technologies
to support decentralization, interoperability, user experiences, interactions,
and monetization. Our presented study highlights the existing challenges for
each component, followed by research directions and potential solutions. To the
best of our knowledge, this survey is the most comprehensive and allows users,
scholars, and entrepreneurs to get an in-depth understanding of the Metaverse
ecosystem to find their opportunities and potentials for contribution
Consequences of the compatibility of skein algebra and cluster algebra on surfaces
We investigate two algebra of curves on a topological surface with punctures
- the cluster algebra of surfaces defined by Fomin, Shapiro, and Thurston, and
the generalized skein algebra constructed by Roger and Yang. By establishing
their compatibility, we resolve Roger-Yang's conjecture on the deformation
quantization of the decorated Teichmuller space. We also obtain several
structural results on the cluster algebra of surfaces. For example, the cluster
algebra of a punctured torus is not finitely generated, and it differs from its
upper cluster algebra.Comment: 31 pages, New title and introduction. Comments are welcome
Optical coherence tomography methods using 2-D detector arrays
Optical coherence tomography (OCT) is a non-invasive, non-contact optical technique that allows cross-section imaging of biological tissues with high spatial resolution, high sensitivity and high dynamic range. Standard OCT uses a focused beam to illuminate a point on the target and detects the signal using a single photodetector. To acquire transverse information, transversal scanning of the illumination point is required. Alternatively, multiple OCT channels can be operated in parallel simultaneously; parallel OCT signals are recorded by a two-dimensional (2D) detector array. This approach is known as Parallel-detection OCT. In this thesis, methods, experiments and results using three parallel OCT techniques, including full -field (time-domain) OCT (FF-OCT), full-field swept-source OCT (FF-SS-OCT) and line-field Fourier-domain OCT (LF-FD-OCT), are presented. Several 2D digital cameras of different formats have been used and evaluated in the experiments of different methods. With the LF-FD-OCT method, photography equipment, such as flashtubes and commercial DSLR cameras have been equipped and tested for OCT imaging. The techniques used in FF-OCT and FF-SS-OCT are employed in a novel wavefront sensing technique, which combines OCT methods with a Shack-Hartmann wavefront sensor (SH-WFS). This combination technique is demonstrated capable of measuring depth-resolved wavefront aberrations, which has the potential to extend the applications of SH-WFS in wavefront-guided biomedical imaging techniques
Recent Hong Kong cinema and the generic role of film noir in relation to the politics of identity and difference
This thesis identifies a connection in Hong Kong cinema with classical Hollywood film noir and examines what it will call a 'reinvestment' in film noir in recent films. It will show that this reinvestment is a discursive strategy that both engages the spectator-subject in the cinematic practice and disengages him or her from the hegemony of the discourse by decentring the narrative. The thesis argues that a cinematic practice has occurred in the recent reinvestment of film noir in Hong Kong, which restages the intertextual relay of the historical genre that gives rise to an expectation of ideas about social instability. The noir vision that is seen as related to the fixed categories of film narratives, characterizations and visual styles is reassessed in the course of the thesis using Derridian theory. The focus of analysis is the way in which the constitution of meanings is dependent on generic characteristics that are different. Key to the phenomenon is a film strategy that destabilizes, differs and defers the interpretation of crises-personal, social, political and/or cultural-by soliciting self-conscious re-reading of suffering, evil, fate, chance and fortune. It will be argued that such a strategy evokes the genre expectation as the film invokes a network of ideas regarding a world perceived by the audience in association with the noirish moods of claustrophobia, paranoia, despair and nihilism. The noir vision is thus mutated and transformed when the film device differs and defers the conception of the crises as tragic in nature by exposing the workings of the genre amalgamation and the ideological function of the cinematic discourse. Thus, noirishness becomes both an affect and an agent that contrives a self-reflexive re-reading of the tragic vision and of the conventional comprehension of reality within the discursive practice. The film strategy, as an agent that problematizes the film form and narrative, gives rise to what I call a politics of difference, which may also be understood as the Lyotardian 'language game' or a practice of 'pastiche' in Jameson's terminology. Under the influence of the film strategy, the spectator is enabled to negotiate his or her understanding of recent Hong Kong cinema diegetically and extra-diegetically by traversing different positions of cinematic identification. When the practice of genre amalgamation adopts the visual impact of the noirish film form, the film turns itself into a playing field of 'fatal' misrecognition or a site of question. Through cinematic identification and alienation from the identification, the spectator-subject is enabled to experience the misrecognition as the film slowly foregrounds the way in which the viewer's presence is implicated in the narrative. This thesis demonstrates that certain contemporary Hong Kong films introduce this selfconscious mode of explication and interpretation, which solicits the spectator to negotiate his or her subject-position in the course of viewing. The notions of identity and subjectivity under scrutiny will thus be reread. With reference to The Private Eye Blue, Swordsman II, City a/Glass and Happy Together, the thesis shall explore the ways in which the Hong Kong films enable and facilitate a negotiation of cultural identity
A Cornish palimpsest : Peter Lanyon and the construction of a new landscape, 1938-1964
The thesis examines the emergence of Peter Lanyon as one of the few truly innovative British landscape painters this century. In the Introduction I discuss the problematic nature of landscape art and consider the significance of Lanyon's discovery that direct description and linear perspective can be replaced with allusive representational elements by fusing the emotional and imaginative life of the artist with the physical activity of painting. Chapter One concentrates on the period 1936-8 when Lanyon was taught by Borlase Smart, a key figure in the St Ives art colony between the wars. Chapter Two examines the influence of Adrian Stokes and the links between Lanyon's painting and the theories developed in books such as Colour and Form and The Quattro Cento. Chapter Three analyses the period 1940-45 when Lanyon was directly influenced by the constructivism of Nicholson, Hepworth and Gabo. I look closely at their approaches to abstraction and assess Lanyon's relative position to them. The importance of Neo-Romanticism and the status of St Ives as a perceived avant-garde community is also addressed. In Chapter Four I discuss how Lanyon resolved to achieve a new orientation in his art on his return from wartime service with the RAF by synthesising constructivism, and traditional landscape. The Generation and Surfacing Series demonstrate his preoccupation with a sense of place, a fascination with the relationships between the human body and landscape and his struggle to find a technique and style that was entirely his own. His sense of existential insideness is discussed in Chapter Five through an examination of the work derived from Portreath, St. Just and Porthleven - key places in Lanyon's psychological attachment to the landscape of West Penwith. In Chapter Six I examine Lanyon's attachment to myths and archetypal forms, tracing the influence of Bergson's vitalist philosophy as well as his use of Celtic and classical motifs. Chapter Seven is a discussion of the malaise evident in Lanyon's work by 1955 and the impact of American Abstract Expressionism at the Tate Gallery a year later. In the summer of 1959 Lanyon joined the Cornish Gliding Club and Chapter Eight looks at how this necessitated a dynamic, expanded conception of the landscape and a re-thinking of relations within the picture field. The ability to dissolve boundaries encouraged him to break down distinctions between painting and construction so that abstract sculptural elements were now assembled into independent works of art. Finally, Chapter Nine assesses Lanyon's overall position in relation to his early influences and to St Ives art as a whole, his response to new directions in art coming out of London and NewYork in the early 1960s and the importance of travel as a stimulus for further realignment in his artistic and topographical horizons. His pictorial inventiveness and vitality remained unabated at the time of his death and would undoubtedly have continued to be enriched by travel abroad and contact with new movements in modem art on both sides of the Atlanti
CIAB 10. X Congreso internacional arquitectura blanca
La Cátedra Blanca Valencia ha programado la celebración del 10º Congreso Internacional de Arquitectura Blanca [CIAB10] durante los días 23, 24 y 25 de marzo de 2022 en la Escuela de Arquitectura de la Universitat Politècnica de València. El Congreso se celebrará con un formato híbrido, es decir, habrá presencialidad de los conferenciantes y de tod@s aquell@s que quieran asistir, pero al mismo tiempo se posibilitará el seguimiento del Congreso en formato online. Cada edición de los CIABs, incluye: por un lado,conferencias en las que se muestran una selección de los mejores estudios de arquitectura a nivel internacional, estudios que están trabajando con el hormigón visto como materia principal de sus proyectos; por otro lado, comunicaciones no sólo de carácter autobiográfico de proyecto construido, sino también carácter histórico, crítico, teórico o tecnológico, mostrando las últimas novedades desarrolladas por las empresas del ámbito del hormigón vistoLizondo Sevilla, L. (2022). CIAB 10. X Congreso internacional arquitectura blanca. Editorial Universitat Politècnica de València. https://doi.org/10.4995/CIAB10.2022.15012EDITORIA
Foot and Ankle Impairments Affecting Mobility in Stroke
Introduction:
Altered foot characteristics are common in people with stroke, with a third presenting with abnormal foot posture which is associated with ambulatory difficulties. Understanding the relationship between measures of foot and ankle impairment and their association with mobility and balance outcomes is therefore important; however, poor clinimetric properties of foot and ankle measures after stroke precludes evaluation of these relationships. Therefore, this research, undertaken as part of a multicentred research project, had the following aims:
Study 1: To evaluate the clinimetric properties (feasibility, test–retest reliability, and clinical relevance) of measures of foot and ankle impairments, for application in people with stroke.
Study 2: To examine how these measures differ between people with stroke and normal controls; and whether they are associated with mobility and balance outcomes.
Methods:
In Study 1, community-dwelling people with stroke, able to walk 10 m (metres), attended two testing sessions to evaluate the clinimetric properties of different foot and ankle measures. These included: static foot posture and dynamic foot loading (peak plantar pressure, PPP, contact area, CA and centre of pressure, CP) using a plantar pressure mat; isometric muscle strength using a hand-held dynamometer (HHD); peak ankle and hallux dorsiflexion and stiffness using bespoke rigs; and ankle plantarflexion spasticity using the Tardieu scale. Statistical analysis used intraclass correlation coefficients (ICCs₍₃,₁₎), standard error of measurement (SEM) and Bland–Altman plots.
In Study 2, measures identified as reliable from Study 1 were incorporated in a cross-sectional study design. Participants were recruited from acute and community neurological services in East London and North Devon. Statistical analysis tested the differences between groups and between affected limbs in people with stroke. Impairment measures were evaluated using multivariate regression analysis for their association with functional outcomes: walking speed (over 10 m); Timed Up and Go (TUAG), Forward Functional Reach Test (FFRT) and presence of falls (> 1 in the last 3 months).
Results:
In Study 1, 21 people with stroke tested the measures. These were found to be feasible and easy to administer, although loss of data (up to 33%) was observed. All measures had moderate to excellent test–retest reliability (coefficients 0.50‒0.98), except ankle plantarflexion stiffness (ICCs₍₃,₁₎ = 0.00‒0.11).
In Study 2, there were significant differences in all measures between people with stroke (n = 180) and controls (n = 46), apart from static foot posture (p = 0.670), toe deformity (p = 0.782) and peak hallux dorsiflexion (p = 0.320). Between limb differences were identified for all measures except foot posture (p = 0.489) and foot CA (p > 0.05). Multicollinearity analysis found 10 measures appropriate for multivariate regression which identified the following R² and variance explained: 59% walking speed (R² = 0.543); 49% TUAG (R² = 0.435); 36% FFRT (R² = 0.285) and 26% for Falls Presence.
Conclusion:
The study demonstrated that seven foot and ankle measures of impairment after stroke were clinically feasible, reliable and associated with mobility and balance outcomes. The measures were ankle and foot isometric muscle strength, sway velocity, PPP (RFT and FFT), CA (MFT and FFT) and peak ankle dorsiflexion. These measures can now be incorporated into research to examine methods to improve the treatment of foot and ankle after stroke
Between Formenlehre and Cognition: A Puzzle-Based Investigation into the Perceptibility of Classical Syntax
A hybrid of theory-based analysis and empirical enquiry, this dissertation seeks to investigate the perceptibility of Classical syntax, ultimately striving to bridge the knowledge gaps that have long existed between the fields of analysis and cognitive science. In particular, the study looks to address the following unknowns: 1) recognition of initial tonic; 2) recognition of tight-knit and loose thematic constructions; and 3) understanding of the contextual nature of cadence. The study centres on the reconstruction of Classical piano sonatas that have been segmented into puzzle pieces using form-functional and sonata theories, an approach that enables the application of syntactical and formal perspectives in an empirical setting, thus giving this study its novelty. The following were hypothesised: 1) sequential accuracy, the ability to process Classical syntax and level of formal training are linearly related; 2) functional recognition, however, is found in any individual familiar with Western musical style regardless of educational background; 3) understanding of Classical syntax is largely Mozartean.
The experiments were carried out virtually and were targeted at subjects that were representative of the spectrum of theoretical expertise. Results collected confirm the ability of subjects to organise formal functions, discern initial tonic given a random mix of harmonic shades, recognise the difference between tight-knit and loose themes and their significance, as well as the prevalence of Mozartean idiom in the cognitive faculty and the linear relationship between expertise and accuracy. Inasmuch as these findings strongly suggest that form-functional relationships are audible, the dissertation argues for the incorporation of both analysis and empirical science in music education, a combination that results in a richer understanding and deeper appreciation of musical processes
Measurement, Knowledge, and Representation: A Sociological Study of Arctic Sea-Ice Science
Satellite-derived observations of Arctic sea ice are instrumental in contemporary sea-ice research. Through the production and dissemination of data products, these observations shape our understanding of Arctic sea-ice conditions, knowledge of which is essential for informing policy responses, decision-making, and action in the face of unprecedented climate change. However, due to the complex, dynamic, and indeterminate nature of sea ice and various scientific and technological challenges involved in its observation, measurement, and representation, the accuracy to which these products depict Arctic sea ice is limited. Moreover, the methodologies used to acquire, process, and report satellite data vary between scientific institutions, resulting in inconsistent estimates of key sea-ice parameters.
Informed by social constructivist arguments developed within science and technology studies and critical cartography, this thesis contends that satellite-derived sea-ice data products represent a particular way of observing, interpreting, and classifying complex geophysical conditions that is socially and culturally contingent. This raises important questions about how sea-ice knowledge is constructed through the interactions between sea ice, sensing technologies, and social practices. Accordingly, this thesis integrates ethnographic and visual methodologies to critically explore how dynamic and indeterminate geophysical data are acquired, processed, and reported in Arctic sea-ice science. By examining sea-ice data products in terms of their underlying practices and technologies, institutional settings, and the broader socio-cultural, political, and historical contexts in which they are embedded, this thesis provides insights into the sociological nature of contemporary sea-ice research. It concludes that greater recognition of the social contingencies shaping how sea-ice data products are generated and disseminated is needed to foster more democratic and socially responsible forms of scientific knowledge. The findings presented in this thesis may provide valuable starting points for critically examining how sea-ice science may be made more equitable and enriched or improved by alternative perspectives
The Lost Futures of Simone Weil: Metaxu, Decreation, and the Spectres of Myth
This dissertation places literature and myth at the suture of two of Simone Weil's most important concepts: decreation and metaxu. Decreation, or the decanting of subjectivity to become one with God, has become a fixture in Weil scholarship. Yet, the link between decreation and metaxu, the bridges that collapse self and other, has yet to be theorized. This study brings metaxu to the forefront of Weil studies to emphasize its role within the domains of community and culture, thereby signalling its unseen potential to harmonize the political and mystical strains of her thought. I counter decreation's salvific consolation with metaxu's radical materialism and its privileging of hybridity, relationality, and metamorphosis.
Weil's writing combines a critique of capitalism with a frequent entanglement of Greek and Christian myth. A discussion of metaxu is brought to bear on literary revisions of classical myths from the 1980s and 1990s, an important peak in capitalism's global dominance. I investigate revisions of myths of transcendence, but also transcendence as a key myth challenged by late twentieth-century literature.
In Chapter 1, I outline the importance of metaxu to Weil's writings on mysticism and locate its roots in Platonic philosophy, Greek Tragedy, and the myth of Prometheusthe subject of her most important (but nearly forgotten) poem. In Chapter 2, I analyze metaxu's relationship to specific iterations of violence and sacrality in Weil's The Iliad: or the poem of Force (1939) and Cormac McCarthy's Blood Meridian (1985), which I interpret as an Americanized retelling of Homer's epic. In Chapter 3, I locate metaxu's connection to art and neoliberal globalism through Salman Rushdie's The Ground Beneath Her Feet (1999). Chapter 4 applies metaxu to issues of metamorphosis and hybridity through Octavia Butler's Dawn (1987). Butler deconstructs notions of mysticism, eroticism, otherness, and species that are to be read against the patriarchal aesthetics of Homer, McCarthy, and Rushdie. By reading these texts together, a subversive and disruptive potential for metaxu will be revealed, one that heralds an important re-reading of Weil's oeuvre, as well as an ability to reshape the intersection of literature, myth, and mysticism
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