159 resultados para mesopic vision


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Since its origins in the 19th century, modern schooling has been a continuously contested domain within nation states. Underlying this contestation dynamic lie competing value systems about the social purpose of education; competing values around which are generated different discourses, and which in turn generate inherently contradictory social and organisational structures. As reflected in other areas of society, the 20th century expansion of state-provided schooling has essentially developed around variations of a bureaucratic model Thus, organisational cultures based around bureaucratic values have come to permeate the enterprise of schooling on a world wide scale. Concomitantly, the value for education to be fundamentally associated with human emancipation from psychological, social, political, or economic states of being, persists as a recurring theme in modern schooling. Premised on these understandings, the thesis argues that the development of the practices of school psychology as a profession, like education in general, and special education in particular, has similarly been influenced by tensions between different and competing constellations of values. It is argued that throughout the 20th century, the pervasiveness of formal schooling systems suggest that schooling may be understood as a modernist cultural archetype. As a socially constructed reality, the phenomenon of schooling has become unproblematic the apparent cultural inevitability of formal schooling in the modern era can also be understood as a premise of a systemised way of looking at the world; that of bureaucratic consciousness. Dialectically, bureaucratic consciousness persists in influencing every manifestation of schooling; structurally through its organisational forms, and epistemologically through the institutionalization of teaching and learning. A particular illustration of the dialectical relationship between bureaucratic consciousness and the social forms and social practices of schooling is the school psychology profession which has developed as a part of school systems. The thesis argues that the epistemic archeology of psychology as a knowledge discipline can be traced through an earlier European intellectual and cultural tradition, but in the 20th century, has come to develop a symbiotic yet contradictory relationship with compulsory schooling in the modern nation state. The research study employs historical and fieldwork methods in a study of the development of the school psychology services within the Victorian Education Department, particularly between 1947 and 1987. The thesis also draws upon several usually distinct literatures; the philosophical and theoretical discourse of modernity and post modernity, the history and development of modern schooling, the ethnography of schooling, the international comparative literature on the school psychology profession, and the literature on action research in education practice and curriculum development, As a case study of Victorian school psychology, the research eschews a quantitative statistical approach in favour of qualitative investigatory genres, which have in turn been guided by the values of action research in education, as well as those of critical theory. The important focus of the thesis is its investigation of some aspects of the development and transformations within the Victorian state education bureaucracy, and the dialectical relationship that has persisted between the evolution of change processes and the shifting conceptions of school psychology practices in the 20th century. A history of the organisational development of school psychology services in Victoria constitutes an important part of the thesis. This is complemented by specific illustrations of how some school psychologists have been influenced by and have contributed towards paradigm shifts within the profession, shifts relating to how the changing nature of their work practices have come to be understood and valued by teachers and by school administrators. The work of J. R. MacLeod from the 1950s is noted in this regard. Particular attention is also drawn to the dialectical relationship between bureaucratic consciousness and school psychology's professional orientation in the 1980s. As a means of providing field data to explore this relationship, ethnographic case studies with two school communities are included as part of the fieldwork of the thesis, and are based upon the author's own work in the mid 1980s. These case studies provide a basis for conceptually refraining the school psychologist's professional experience within schooling systems, and an opportunity to examine how competing value systems impact upon the work of the school psychologist. The thesis concludes with some observations about bureaucratic transformations within educational organisations, and about the future relationship of the school psychology profession with schooling systems, as framed by the theoretical parameters of the modernist /post modernist debate. The issue of competing value systems within the administration of public education is re-examined as is the value of promoting human empowerment in the ongoing work of the school psychologist. Finally, some scenario building with reference to the future of school psychology in Victoria in is undertaken.

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My thesis tilled Feminist Poetics: Symbolism in an Emblematic Journey Reflecting Self and Vision, consists of thirty oil paintings on canvas, several preparatory sketches and drawings in different media on paper, and is supported and elucidated by an exegesis. The paintings on unframed canvases reveal mise en scčnes and emblems that present to the viewer a drama about links between identities, differences, relationships and vision. Images of my daughter, friends and myself fill single canvases, suites of paintings, diptyches and triptychs. The impetus behind my research derives from my recognition of the cultural means by which women's experience is excluded from a representational norm or ideal. I use time-honoured devices, such as, illusionist imagery, aspects of portraiture, complex fractured atmospheric space, paintings and drawings within paintings, mirrors and reflective surfaces, shadows and architectural devices. They structure my compositions in a way that envelops the viewer in my internal world of ideas. Some of these features function symbolically, as emblems. A small part of the imagery relies on verisimilitude, such as my hands and their shadow and my single observing eye enclosed by my glasses. What remains is a fantasy world, ‘seen’ by the image of my other eye, or ‘faction’, based on memories and texts explaining the significance of ancient Minoan symbols. In my paintings, I base the subjects of this fantasy on my memories of the Knossos Labyrinth and matristic symbols, such as the pillar, snake, blood, eye and horn. They suggest the presence of a ritual where initiates descended into the adyton (holy of holies) or sunken areas in the labyrinth. The paintings attempt a ‘rewriting’ of sacrality and gender by adopting the symbolism of death, transformation and resurrection in the adyton. The significance of my emblematic imagery is that it constructs a foundation narrative about vision and insight. I sought symbolic attributes shared by European oil painting and Minoan antiquity. Both traditions share symbolic attributes with male dying gods in Greek myths and Medusa plays a central part in this linkage. I argue that her attributes seem identical to both those of the dying gods and Minoan goddesses. In the Minoan context these symbols suggest metaphors for the female body and the mother and daughter blood line. When the symbols align with the beheaded Medusa in a patriarchal context, both her image and her attributes represent cautionary tales about female sexuality that have repercussions for aspects of vision. In Renaissance and Baroque oil painting Medusa's image served as a vehicle for an allegory that personified the triumph of reason over the senses. In the twentieth century, the vagina dentata suggests her image, a personified image of irrational emotion that some male Surrealists celebrated as a muse. She is implicated in the male gaze as a site of castration and her representation suggests a symbolic form pertaining to perspective. Medusa's image, its negative sexual and violent connotations, seemed like a keystone linking iconographic codes in European oil painting to Minoan antiquity. I fused aspects of matristic Minoan antiquity with elements of European oil paintings in the form of disguised attribute gestures, objects and architectural environments. I selected three paintings, Dürer's Setf-Portrait, 1500, Gentileschi's Self-Portrait as the Allegory of Painting, 1630 and Velazquez's Las Meniruis, 1656 as models because 1 detected echoes of Minoan symbolism in the attributes of their subjects and backgrounds. My revision of Medusa's image by connecting it to Minoan antiquity established a feminist means of representation in the largely male-dominated tradition of oil painting. These paintings also suggested painting techniques that were useful to me. Through my representations of my emblematic journey I questioned the narrow focus placed on phallic symbols when I explored how their meanings may have been formed within a matricentric culture. I retained the key symbols of the patriarchal foundation narratives about vision but removed images of violence and their link to desire and replaced it with a ritual form of symbolic death. I challenged the binary oppositional defined Self as opposed to Other by constructing a complex, fluid Self that interacts with others. A multi-directional gaze between subjects, viewers and artist replaces the male gaze. Different qualities of paint, coagulation and random flow form a blood symbolism. Many layers of paint retaining some aspects of the Gaze and Glance, fuse and separate intermittently to construct and define form. The sense of motion and fluidity constructs a form of multi-faceted selves. The supporting document, the exegesis is in two parts. In the first part, I discuss the Minoan sources of my iconography and the symbolic gender specific meanings suggested by particular symbols and their changed meanings in European oil painting, I explain how I integrate Minoan symbols into European oil paintings as a form of disguised symbolism. In the second part I explain how my alternative use of symbolism and paint alludes to a feminist poetic.

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Ring species, in which reproductively isolated forms are connected by a chain of intermediate populations, provide valuable insights into the maintenance of trait variability, divergence in sympatry, and the how small changes can lead to species level differences. The parrot Platycercus elegans of eastern Australia is highly variable in plumage coloration in the wild, ranging from pale yellow to deep crimson in the chest, rump and head. It has been suggested as the only known parrot ring species worldwide, and one of less than ~25 ring species amongst all organisms. We test hypotheses for the information signalled by the colour variation, and for the maintenance of the variability.

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 Poster Presentation

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Reports on primary mental health care reform in Australia 1991-2001 and the involvement of general practioners as the key providers. Investigates the degree to which the vision of policy makers and key stakeholders for a more integrated and effective system had been achieved. Findings suggested there is a considerable mismatch between the policy vision and the implementation reality and that the current system falls short of providing the support and systemic changes necessary for GPs to provide effective mental health care.

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A complete and highly robust 3D reconstruction algorithm based on stereo vision is presented. The developed system is capable of reconstructing dimensionally accurate 3D models of the objects and is very simple and cost effective due to its prominent software dependency and minimal hardware involvevment unlike existing systems.

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This thesis explores the contexts, conditions and implications of postmodern "visuality" through a body of films that display a critical preocupation with vision, visual technologies and violence, and which promote the demystification of visual cultures and the expansion of perception and subjectivity.

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Develops an award winning design for an omnidirectional mobile robot that is both lightweight and extremely maneuverable. Two methods of robot vision, one using rotating lasers and a second using color video cameras were also developed and the merits of both explored.

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Tracking a target from a video stream (or a sequence of image frames) involves nonlinear measurements in Cartesian coordinates. However, the target dynamics, modeled in Cartesian coordinates, result in a linear system. We present a robust linear filter based on an analytical nonlinear to linear measurement conversion algorithm. Using ideas from robust control theory, a rigorous theoretical analysis is given which guarantees that the state estimation error for the filter is bounded, i.e., a measure against filter divergence is obtained. In fact, an ellipsoidal set-valued estimate is obtained which is guaranteed to contain the true target location with an arbitrarily high probability. The algorithm is particularly suited to visual surveillance and tracking applications involving targets moving on a plane.

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The problem of visual simultaneous localization and mapping (SLAM) is examined in this paper using ideas and algorithms from robust control and estimation theory. Using a stereo-vision based sensor, a nonlinear measurement model is derived which leads to nonlinear measurements of the landmark coordinates along with optical flow based measurements of the relative robot-landmark velocity. Using a novel analytical measurement transformation, the nonlinear SLAM problem is converted into the linear filter is guaranteed stable and the ALAM state estimation error is bounded within an ellipsoidal set. No similar results are available for the commonly employed extended Kalman filter which is known to exhibit divergent and inconsistency characteristics in practice.