4,181 research outputs found
Scale-Adaptive Neural Dense Features: Learning via Hierarchical Context Aggregation
How do computers and intelligent agents view the world around them? Feature
extraction and representation constitutes one the basic building blocks towards
answering this question. Traditionally, this has been done with carefully
engineered hand-crafted techniques such as HOG, SIFT or ORB. However, there is
no ``one size fits all'' approach that satisfies all requirements. In recent
years, the rising popularity of deep learning has resulted in a myriad of
end-to-end solutions to many computer vision problems. These approaches, while
successful, tend to lack scalability and can't easily exploit information
learned by other systems. Instead, we propose SAND features, a dedicated deep
learning solution to feature extraction capable of providing hierarchical
context information. This is achieved by employing sparse relative labels
indicating relationships of similarity/dissimilarity between image locations.
The nature of these labels results in an almost infinite set of dissimilar
examples to choose from. We demonstrate how the selection of negative examples
during training can be used to modify the feature space and vary it's
properties. To demonstrate the generality of this approach, we apply the
proposed features to a multitude of tasks, each requiring different properties.
This includes disparity estimation, semantic segmentation, self-localisation
and SLAM. In all cases, we show how incorporating SAND features results in
better or comparable results to the baseline, whilst requiring little to no
additional training. Code can be found at:
https://github.com/jspenmar/SAND_featuresComment: CVPR201
Aspects of plant dispersal in the southwestern Cape with particular reference to the roles of birds as dispersal agents
The dispersal of plants with particular attention to the roles birds play as dispersal agents was studied in the southwestern Cape, South Africa from 1983 to 1985. The research was organized as ten inter-related studies, each with an independent data base. Each chapter focused on a different scale of plant dispersal processes ranging from regional assemblages of plant species to individual species. At the largest scale, the seven vegetation types commonly occurring in the southwestern Cape were examined for incidence of vertebrate-dispersed plants. Coastal Thicket and Afromontane Forest were found to be the richest in these species. The colonization of vertebrate-dispersed plants was examined in an artificially cleared area of Mountain Fynbos vegetation. Enhanced densities of vertebrate-dispersed species were found in areas where perches had been provided. The seasonal availability of vertebrate-dispersed species was found to be most continuous in Coastal Thicket vegetation. Fruit displays of vertebrate-dispersed indigenous plants were found to vary from those that were sporadic and inconspicuous, to those that were conspicuous and predictable, whereas those of alien plants were usually large and conspicuous. Avian use of these fleshy fruits in Coastal Thicket was examined and found to be proportional to their availability. A study of fruit presentation in relation to leaf number and stem thickness suggested that sessile, stem attached fruits have fewer local leaves at time of ripening than fruits which are presented in panicles. This may enhance accessibility and conspicuousness of stem attached fruits for dispersal by birds. Four autecological studies tested certain predictions arising from models developed to describe fruit/frugivore interactions. The dispersal of the alien Acacia cyclops seeds by the indigenous Black Korhaan Eupodotis afra suggested that successful fruit/frugivore relationships are not necessarily the product of reciprocal evolution. The study on Chrysanthemoides monilifera found that efficient dispersal systems are not limited to plants producing small quantities of lipid-rich fruits and to dispersal by obligate frugivores. The abiotic dispersal of Quercus robur was found to be efficient in relation to vertebrate-dispersal. The study on Protasparagus aethiopicus found that the morphology of fleshy fruits may also reflect attempts to overcome the effects of non-dispersing seed predators. 1It is concluded that a gradient from a predictable to unpredictable fruit availability provides a better basis for studying fruit/frugivore interactions than the coevolutionary models. previously presented
Intramolecular Diels-Alder reactions of conformationally restricted systems
Bibliography: leaves 184-191.In the first phase of this investigation, the synthesis of triene systems, linked via a diester tether was investigated with the aim of studying the respective thermal Intramolecular Diels-Alder (IMDA) properties. It was envisaged that the diene and dienophile would be linked via a conformationally restricted spacer, trans-cyc1ohexane-l,2-dicarboxylic acid anhydride
Wetland Delineation of Camp Ripley in Minnesota
The Department of Defense (DoD) maintains approximately 25 million acres of land that is used for military training in the continental United States. Currently, federal and state laws and regulations require that the DoD land be managed so that any activity, including training, will have a minimal effect on the natural environment
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INTERPERSONAL EDUCATION THROUGH TUTORIAL WORK
This thesis describes the development of two curriculum innovations in the sphere of personal and social education - Developmental Group Work and Active Tutorial Work. Developmental Group Work was devised by Dr. Leslie Button for work with adolescents, mainly in small groups. Active Tutorial Work is a programme devised by a curriculum development team in Lancashire for work with students in secondary schools, and was strongly influenced by the work of Button.
The thesis places these two innovations in a general context of personal and social education before going on to examine them in closer detail. A consideration of the processes, methods and materials reveals that there are both distinct similarities and distinct differences between the two projects. In particular the thesis looks at the way in which Active Tutorial Work evolved in Lancashire from courses in Education for Personal Relationships and from outside influences including Button's work. The complexion of each of the projects is also looked at from a wider educational perspective.
Both innovations developed dissemination strategies workingprimarily through publication and the establishment of a trainingframework. The thesis examines their dissemination strategies inthe context of dissemination theory and the experience of othercurriculum projects.
Training plays a major part in the dissemination of both projects and a number of general issues arise in connection with training and the implementation of a new curriculum innovation. The courses which have been run in Buckinghamshire, in both Developmental Group Work and Active Tutorial Work, are described in some detail, in terms of objectives and in terms of the impact made on the people who attended them. To some extent the nature of the innovations is further reflected in the nature of the training programmes and the thesis explores some of these features and characteristics
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