22282 research outputs found
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On the classifying space for the family of virtually cyclic subgroups for elementary amenable groups
No full text
Fingerprinting Codes and Separating Hash Families
No full textThe thesis examines two related combinatorial objects, namely fingerprinting codes and separating hash families. Fingerprinting codes are combinatorial objects that have been studied for more than 15 years due to their applications in digital data copyright protection and their combinatorial interest. Four well-known types of fingerprinting codes are studied in this thesis; traceability, identifiable parent property, secure frameproof and frameproof. Each type of code is named after the security properties it guarantees. However, the power of these four types of fingerprinting codes is limited by a certain condition. The first known attempt to go beyond that came out in the concept of two-level traceability codes, introduced by Anthapadmanabhan and Barg (2009). This thesis extends their work to the other three types of fingerprinting codes, so in this thesis four types of two-level fingerprinting codes are defined. In addition, the relationships between the different types of codes are studied. We propose some first explicit non-trivial con- structions for two-level fingerprinting codes and provide some bounds on the size of these codes. Separating hash families were introduced by Stinson, van Trung, and Wei as a tool for creating an explicit construction for frameproof codes in 1998. In this thesis, we state a new definition of separating hash families, and mainly focus on improving previously known bounds for separating hash families in some special cases that related to fingerprinting codes. We improve upper bounds on the size of frameproof and secure frameproof codes under the language of separating hash families
The impact of audience age and familiarity on children’s drawings of themselves in contrasting affective states.
No full textThe present study was designed to investigate the impact of familiarity and audience age on children’s self presentation in self drawings of happy, sad and neutral figures. Two hundred children (100 girls and 100 boys) with the average age of 8 yrs 2 months, ranging from 6 yrs 3 months to 10 yrs 1 month, formed two age groups and five conditions (n=20). All children completed two counterbalanced sessions. Session 1 consisted of drawing a neutral figure followed by a sad and happy figure in counterbalanced order. The drawing instructions specified the age of the audience (adult Vs. child) and familiarity (familiar Vs. unfamiliar) differently for each condition. Measures of colour preference were taken in Session 2. Certain drawing strategies, such as waving and smiling varied as a function of audience age and familiarity whilst others, such as colour use, did not. The results are discussed in terms of cue dependency and framework theories of children’s drawings and the need to be aware of specific characteristics of who children are drawing for
Monoidal Computer I: Basic Computability by String Diagrams
No full textWe present a new model of computation, described in terms of monoidal categories. It conforms the Church-Turing Thesis, and captures the same computable functions as the standard models. It provides a succinct categorical interface to most of them, free of their diverse implementation details, using the ideas and structures that in the meantime emerged from research in semantics of computation and programming. The salient feature of the language of monoidal categories is that it is supported by a sound and complete graphical formalism, string diagrams, which provide a concrete and intuitive interface for abstract reasoning about computation. The original motivation and the ultimate goal of this effort is to provide a convenient high level programming language for a theory of computational resources, such as one-way functions, and trapdoor functions, by adopting the methods for hiding the low level implementation details that emerged from practice. In the present paper, we make the initial step towards this ambitious goal, and sketch the ideas how to reach it. These ideas will be elaborated in the three sequel papers, that are in preparation
The Royal Academy of Arts Audio Project
No full textThe Royal Academy Audio Project
Overview
The Royal Academy Audio Project (RAAP) is an on-going practical research project, sponsored by The Contemporary Circle on behalf of the Royal Academy of Art Library.
Aims
The primary purpose of this project is to record a series of interviews with leading Royal Academicians, concentrating on their professional career, and their relationship with the Royal Academy of Art.
Many of the most influential artists of the 20th Century are now of an advanced age and whilst some have been interviewed in the past, many have not – certainly not in a considered and rigorous manner. This project will seek to address that before it is too late. The Library have identified upwards of seventy Royal Academicians that they believe should be included. It is anticipated that RAAP will look to record twelve subjects per year.
Outcomes
The bulk of the material is intended for archive within the Royal Academy of Art library as primary source material for researchers and academics.
1. The completely unedited recordings – the non-mediated audio texts.
2. The ‘Umm & Ah’ Edit – removal of the hesitations and repetitions of all interviews.
3. The 45 Minute Documentary – the mediated text intended as a potentially ‘commercial’ and ‘engaging’ output for educated but uninformed listeners (based on the BBC Reithian precept).
4. Transcription texts of all the interviews (post ‘Umm & Ah’ edit)
Production Breakdown
Interview 1: The artist in his/her studio or workspace
Interview 2: The artist in the sound studio at Royal Holloway
Interview 3: With another RA artist commenting upon the work of the subject.
Interview 4: A recorded conversation between the subject and the commenting artist.
The Radio Documentary – constructed from all the interviews
Personnel
Rhys Davies – Editor (archive) Producer & Studio Presenter (Documentary)
Dr Jean Wainwright – Researcher and Interviewer.
rhysdavies201
Diagnosis of tumors during tissue-conserving surgery with integrated autofluorescence and Raman scattering microscopy
No full textTissue-conserving surgery is used increasingly in cancer treatment. However, one of the main challenges in this type of surgery is the detection of tumor margins. Histopathology based on tissue sectioning and staining has been the gold standard for cancer diagnosis for more than a century. However, its use during tissue-conserving surgery is limited by time-consuming tissue preparation steps (1–2 h) and the diagnostic variability inherent in subjective image interpretation. Here, we demonstrate an integrated optical technique based on tissue autofluorescence imaging (high sensitivity and high speed but low specificity) and Raman scattering (high sensitivity and high specificity but low speed) that can overcome these limitations. Automated segmentation of autofluorescence images was used to select and prioritize the sampling points for Raman spectroscopy, which then was used to establish the diagnosis based on a spectral classification model (100% sensitivity, 92% specificity per spectrum). This automated sampling strategy allowed objective diagnosis of basal cell carcinoma in skin tissue samples excised during Mohs micrographic surgery faster than frozen section histopathology, and one or two orders of magnitude faster than previous techniques based on infrared or Raman microscopy. We also show that this technique can diagnose the presence or absence of tumors in unsectioned tissue layers, thus eliminating the need for tissue sectioning. This study demonstrates the potential of this technique to provide a rapid and objective intraoperative method to spare healthy tissue and reduce unnecessary surgery by determining whether tumor cells have been removed
A model for dynamic reconfiguration in service-oriented architectures
No full textThe importance of modelling the dynamic characteristics of the architecture of software systems has long been recognised. However, the nature of the dynamics of service-oriented applications goes beyond what is currently addressed by architecture description languages (ADLs). At the heart of the service-oriented approach is the logical separation between the service need and the need-fulfillment mechanism, i.e., the provision of the service: the binding between the requester and the provider is deferred to run time and established at the instance level, i.e., each time the need for the service arises. As a consequence, computation in the context of service-oriented architectures transforms not only the states of the components that implement applications but also the configurations of those applications. In this paper, we present a model for dynamic reconfiguration that is general enough to support the definition of ADLs that are able to address the full dynamics of service-oriented applications. As an instance of the model, we present a simple service-oriented ADL derived from the modelling language srml that we developed in the Sensoria project. © 2012 Springer-Verlag
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