ARCHANGEL: Tamper-proofing Video Archives using Temporal Content Hashes on the Blockchain

We present ARCHANGEL; a novel distributed ledger based system for assuring the long-term integrity of digital video archives. First, we describe a novel deep network architecture for computing compact temporal content hashes (TCHs) from audio-visual streams with durations of minutes or hours. Our TCHs are sensitive to accidental or malicious content modification (tampering) but invariant to the codec used to encode the video. This is necessary due to the curatorial requirement for archives to format shift video over time to ensure future accessibility. Second, we describe how the TCHs (and the models used to derive them) are secured via a proof-of-authority blockchain distributed across multiple independent archives. We report on the efficacy of ARCHANGEL within the context of a trial deployment in which the national government archives of the United Kingdom, Estonia and Norway participated.Comment: Accepted to CVPR Blockchain Workshop 201

Topic Similarity Networks: Visual Analytics for Large Document Sets

We investigate ways in which to improve the interpretability of LDA topic models by better analyzing and visualizing their outputs. We focus on examining what we refer to as topic similarity networks: graphs in which nodes represent latent topics in text collections and links represent similarity among topics. We describe efficient and effective approaches to both building and labeling such networks. Visualizations of topic models based on these networks are shown to be a powerful means of exploring, characterizing, and summarizing large collections of unstructured text documents. They help to "tease out" non-obvious connections among different sets of documents and provide insights into how topics form larger themes. We demonstrate the efficacy and practicality of these approaches through two case studies: 1) NSF grants for basic research spanning a 14 year period and 2) the entire English portion of Wikipedia.Comment: 9 pages; 2014 IEEE International Conference on Big Data (IEEE BigData 2014

Rebels Leading London: the mayoralties of Ken Livingstone and Boris Johnson compared

The file attached to this record is the author's final peer reviewed version. The Publisher's final version can be found by following the DOI link

Measuring attendance: issues and implications for estimating the impact of free-to-view sports events

A feature of many non-elite sports events, especially those conducted in public places is that they are free-to-view. The article focuses on the methodological issue of estimating spectator attendance at free-to-view events and the consequences of this for impact evaluation. Using empirical data from three case studies, the article outlines various approaches to measuring attendance and discusses the key issues and implications for evaluating free-to-view sports events in the future

Service quality at the London 2012 Games – a Paralympics Athletes Survey

Purpose – This paper reports on aspects of service quality at the London 2012 Paralympic Games,from a rather unusual perspective, the athletes. To date there has been little evidence captured about athlete’s satisfaction at sporting events, and specifically about their perceptions of the service quality provided. Design/methodology/approach – Unique ‘full’ access to the London 2012 Paralympics allowed to the collection of data directly from the athletes. The study reports the questionnaire findings from a sample of 250 respondents. Findings – From this study an operational assessment and performance framework has been generated composed of 10 criteria and 73 items or sub-criteria, which can be used as a benchmarking tool to plan, design and compare future sport mega-event. Moreover, the study evidence based the high quality of the 2012 Paralympics Games, as he athletes rated, on a 5 point Likert scale, 64 items in the ‘very satisfied’ category, a very positive set of feedback for the Games organisers. Research limitations/implications – The methodology applied was appropriate, generating data to facilitate discussion and draw specific conclusions from. A perceived limitation is the single case approach; however, this can be enough to add to the body of knowledge where very little evidence has been captured so far and where the objectives were to explore the Paralympics games service quality and performance. Practical implications – This research provides a tangible evidence base to support future sport event decision-makers, planners and designers in this highly complex ‘arena’. In any system, there are always areas for improvement (AFIs), these are highlighted within the paper for further investigation. Originality/value – This is the first paper to identify and synthesize aspects of sport mega event service quality from the athletes viewpoint and informs how well designed, organised and managed the London 2012 Games were from a primary user perspective. The paper makes a defined contribution by developing evidence based recommendations for this important yet under researched area

Intersections and differentiations: a corpus-assisted discourse study of gender representations in the British press before, during and after the London Olympics 2012

This study examines the impact of a global sports event on gender representations in media reporting. Whereas previous research on gender, sport and media has been mainly concerned with sports events in the North American or Australian context, this study investigates the British media reporting before, during and after the London Olympics 2012. Our study follows the approach of Corpus-Assisted Discourse Studies (CADS) and uses both quantitative and qualitative research procedures. The results reveal more balanced gender representations during the London Olympics in that the ‘regular’ biased associations were supressed in favour of positive references to female achievements. However, little carry-though of the ‘gains’ was noted. Also, this study shows that the positive associations intersected with national sentiments and were used to celebrate the nation-state. At the same time, some subtle resistance was observed to accepting as ‘truly’ British the non-white athletes and those not born in Britain

The impact of economic growth on the competitiveness of national elite sport systems

India is the extreme under - achiever in international sport competitions. This has only marginally changed with the recent promotion of the Indian economy into the league of BRIC nations. Whereas in China high growth rates have been accompanied by a huge im provement of its performance in international sport events a similar impact of extraordinary growth rates has been almost totally absent in the case of India. Is India an exception? Several econometric studies have shown that income per capita is a signifi cant variable explaining elite sport results such as results in the Olympic Games. From this stylized fact follows the hypothesis that 'above/below average' growth rates lead to relative improvements/deterioration of elite sport results (with a time lag)‟. This paper tests the hypothesis by means of a study of the correlation between growth in GNP per capita and growth in medal points in the sports of the Olympic Summer Games. The findings show no correlation. However, a detailed analysis of country evidenc e shows interesting trends and details. The paper concludes with tentative explanations for the findings including the contradictory country evidence

Tracking changes in everyday experiences of disability and disability sport within the context of the 2012 London Paralympics

The 2012 Paralympics was the biggest ever, the most accessible and best attended in its 64-year history. The Paralympics and ideas of disability associated with the Games provide significant opportunity for reflection on how far societal opinions, attitudes and behaviour have changed regarding disability. In 2012 – the first ever “legacy games” – an explicit aim of the Paralympics was to “transform the perception of disabled people in society”, (Channel 4), and use sport to contribute to “a better world for all people with a disability” (IPC 2011). The 2012 Games therefore came with a social agenda: to challenge the current perceptions many people have about disability and disability sport. Within this report – commissioned by the UK’s Paralympic broadcaster, Channel 4 – we consider everyday experiences of disability and disability sport within the context of the London 2012 Paralympics and televised coverage of the Games. The analysis is based 140 in-depth interviews that took place in the UK over a period of eighteen months, during the lead up to, and immediately after, the Games: between January 2011 and September 2012. Embedded in the lifeworld of our participants, we ask whether the 2012 Paralympics was successful in changing perceptions of disability