Supervised latent dirichlet allocation models for efficient activity representation

Local spatio-temporal features with a Bag-of-visual words model is a popular approach used in human action recognition. Bag-of-features methods suffer from several challenges such as extracting appropriate appearance and motion features from videos, converting extracted features appropriate for classification and designing a suitable classification framework. In this paper we address the problem of efficiently representing the extracted features for classification to improve the overall performance. We introduce two generative supervised topic models, maximum entropy discrimination LDA (MedLDA) and class- specific simplex LDA (css-LDA), to encode the raw features suitable for discriminative SVM based classification. Unsupervised LDA models disconnect topic discovery from the classification task, hence yield poor results compared to the baseline Bag-of-words framework. On the other hand supervised LDA techniques learn the topic structure by considering the class labels and improve the recognition accuracy significantly. MedLDA maximizes likelihood and within class margins using max-margin techniques and yields a sparse highly discriminative topic structure; while in css-LDA separate class specific topics are learned instead of common set of topics across the entire dataset. In our representation first topics are learned and then each video is represented as a topic proportion vector, i.e. it can be comparable to a histogram of topics. Finally SVM classification is done on the learned topic proportion vector. We demonstrate the efficiency of the above two representation techniques through the experiments carried out in two popular datasets. Experimental results demonstrate significantly improved performance compared to the baseline Bag-of-features framework which uses kmeans to construct histogram of words from the feature vectors.

Automatic UAV forced landing site detection using machine learning

The commercialization of aerial image processing is highly dependent on the platforms such as UAVs (Unmanned Aerial Vehicles). However, the lack of an automated UAV forced landing site detection system has been identified as one of the main impediments to allow UAV flight over populated areas in civilian airspace. This article proposes a UAV forced landing site detection system that is based on machine learning approaches including the Gaussian Mixture Model and the Support Vector Machine. A range of learning parameters are analysed including the number of Guassian mixtures, support vector kernels including linear, radial basis function Kernel (RBF) and polynormial kernel (poly), and the order of RBF kernel and polynormial kernel. Moreover, a modified footprint operator is employed during feature extraction to better describe the geometric characteristics of the local area surrounding a pixel. The performance of the presented system is compared to a baseline UAV forced landing site detection system which uses edge features and an Artificial Neural Network (ANN) region type classifier. Experiments conducted on aerial image datasets captured over typical urban environments reveal improved landing site detection can be achieved with an SVM classifier with an RBF kernel using a combination of colour and texture features. Compared to the baseline system, the proposed system provides significant improvement in term of the chance to detect a safe landing area, and the performance is more stable than the baseline in the presence of changes to the UAV altitude.

Re-valuing construction materials and components through design for disassembly

The construction industry accounts for a significant portion of the material consumption of our industrialised societies. That material consumption comes at an environmental cost, and when buildings and infrastructure projects are demolished and discarded, after their useful lifespan, that environmental cost remains largely unrecovered. The expected operational lifespan of modern buildings has become disturbingly short as buildings are replaced for reasons of changing cultural expectations, style, serviceability, locational obsolescence and economic viability. The same buildings however are not always physically or structurally obsolete; the materials and components within them are very often still completely serviceable. While there is some activity in the area of recycling of selected construction materials, such as steel and concrete, this is almost always in the form of down cycling or reprocessing. Very little of this material and component resource is reuse in a way that more effectively captures its potential. One significant impediment to such reuse is that buildings are not designed in a way that facilitates easy recovery of materials and components; they are designed and built for speed of construction and quick economic returns, with little or no consideration of the longer term consequences of their physical matter. This research project explores the potential for the recovery of materials and components if buildings were designed for such future recovery; a strategy of design for disassembly. This is not a new design philosophy; design for disassembly is well understood in product design and industrial design. There are also some architectural examples of design for disassembly; however these are specialist examples and there is no significant attempt to implement the strategy in the main stream construction industry. This paper presents research into the analysis of the embodied energy in buildings, highlighting its significance in comparison with operational energy. Analysis at material, component, and whole-of-building levels shows the potential benefits of strategically designing buildings for future disassembly to recover this embodied energy. Careful consideration at the early design stage can result in the deconstruction of significant portions of buildings and the recovery of their potential through higher order reuse and upcycling.

Podcast: Community wide interventions for increasing physical activity

If the amount of physical activity in a society increased, it should improve public health; but uncertainties remain about how to achieve this. Professor Philip Baker from the Queensland University of Technology in Australia describes the findings from the January 2015 update of the Cochrane review of the evidence on community-wide interventions.

„Livre des merveilles”. Burgundzka wizja Orientu późnego średniowiecza w miniaturach manuskryptu fr. 2810 z Bibliothèque nationale de France

Wydział Historyczny: Instytut Historii Sztuki

Final Archaeological Investigations at the Maynard-Burgess House (18AP64): An 1850-1980 African-American Household in Annapolis, Maryland

The Maynard-Burgess House was excavated by Archaeology in Annapolis from Fall, 1990 to Summer, 1992. The still-standing house is located at 163 Duke of Gloucester Street in Annapolis' Historic District and is today being restored by Port of Annapolis, Incorporated. Archaeological testing and excavation of the site was developed alongside architectural analyses and archival research as the initial phase of the home's restoration. The Maynard-Burgess House was continuously occupied by two African-American families, the Maynards and the Burgesses, from the 1850s until the late 1980s. The main block of the house was built between 1850 and 1858 by the household of John T. Maynard, a free African American born in 1810,and his wife Maria Spencer Maynard. Maynard descendants lived in the home until it was foreclosed in 1908 and subsequently sold to the family of Willis and Mary Burgess in 1915. Willis had been a boarder in the home in 1880, and his sister Martha Ready had married John and Maria's son John Henry. Burgess descendants lived at the home until its sale in 1990.

Archaeological Excavations at 18AP44: 193 Main Street, Annapolis, Maryland, 1985-1987

193 Main Street (18AP44) is located between Main Street and Duke of Gloucester Street. The property was used ass a yard related to residential and commercial buildings during the 18th and 19th centuries. In the 1930's a movie theatre and parking lot were built on the property. That structure was torn down in the 1980's and a three-story commercial building was constructed. Archaeological excavations were conducted on the property from 1985-1987. A preliminary report was written in 1986 by Paul A. Shackel. This report is the final report on the archaeological investigations at 193 Main Street.

E-Participation and E-Participants: solving the patent ‘crisis’

One of the major planks of some visions for E-Gov is that there is a willing participatory group who are more than happy to be involved in new forms of democracy and will be active and useful suppliers of input to e-consultation or e-participation processes. This group is different from that which goes online to the government site web and signs a petition asking the prime minister to resign. It is becoming clear, though, that the commitment to e-participation may well be there in theory, but difficult to access in practice. Further, the participation which is most welcome can frequently require training and expertise which is not widely available or there may be differences in opinion as to the point of participation. In this paper I will look to the attempts to encourage participation in the patent system. The UK is about to initiate a trial system utilising New York Law School’s Peer To Patent project, but has also attempted to involve participants in previous consultation exercises. I will use these as demonstrations of the sorts of problems which e-participation has met, and consider whether this new form of E-Gov is perhaps being oversold. The interesting question is whether participation is a growing tool which can ensure better public services from the State. My conclusion is that consultation and participatory projects can demonstrate involvement and are certainly educative but e-participatory projects are most likely incapable of achieving the goals set by their more optimistic advocates. The paper emphasises the patents field, but the lessons from it can – I suggest – be viewed as indicators having wider governance relevance. The primary point being made is that the technocratic view is always over-optimistic.

Sample size in studies on diagnostic accuracy in ophthalmology:A literature survey

Aim: To assess the sample sizes used in studies on diagnostic accuracy in ophthalmology. Design and sources: A survey literature published in 2005. Methods: The frequency of reporting calculations of sample sizes and the samples' sizes were extracted from the published literature. A manual search of five leading clinical journals in ophthalmology with the highest impact (Investigative Ophthalmology and Visual Science, Ophthalmology, Archives of Ophthalmology, American Journal of Ophthalmology and British Journal of Ophthalmology) was conducted by two independent investigators. Results: A total of 1698 articles were identified, of which 40 studies were on diagnostic accuracy. One study reported that sample size was calculated before initiating the study. Another study reported consideration of sample size without calculation. The mean (SD) sample size of all diagnostic studies was 172.6 (218.9). The median prevalence of the target condition was 50.5%. Conclusion: Only a few studies consider sample size in their methods. Inadequate sample sizes in diagnostic accuracy studies may result in misleading estimates of test accuracy. An improvement over the current standards on the design and reporting of diagnostic studies is warranted.

Oramics: Atlantis Anew

A moving image work co-commissioned by the Science Museum (London), with extensive unprecedented access to the Oramics archive at Goldsmiths College and the Science Museum. Conceived of as an Artist's film in homage to Daphne Oram, the pioneer of British Electronic Music and co-founder of the BBC Radiophonic workshop in 1958, the film features a close-up encounter with her unique invention, the Oramics Machine, housed at the Science Museum in London. Oram used drawn sound principles to compose ‘handwrought' electronic music, and yet the visual nature of her work remains largely unseen and unsung. Exhibitions: ‘Oramics to Electronica’ Science Museum (London 2011-14); solo exhibition as part of the International Rotterdam Film Festival (2013); group exhibition ‘The Sight of Sound’, Deutsche Bank VIP Lounge, Frieze Art Fair, NY (2012); ‘Samsung Art+ Prize’ BFI Southbank, London (2012). Screenings: mini-retrospective at the Lincoln Centre, NY, as part of the New York Film Festival (2013); Jarman Award Tour screenings (2012, venues included Whitechapel Gallery, London; FACT, Liverpool; CCA, Glasgow; The Northern Charter in partnership with CIRCA projects; Nottingham Contemporary, Nottingham; Watershed, Bristol; Duke of York Cinema, Brighton); Mini-retrospective screening and in conversation with Lis Rhodes, Tate Britain (London 2014); Mini-retrospective screening, DIM Cinema, The Cinematheque (Vancouver 2015); Mini-retrospective at Whitechapel Gallery (London 2016).

Sound Seam

A moving image work based on research with neurologists and audiologists, collectors and archivists. The film gives voice to the idea that every surface, in particular parts of our anatomy, is potentially inscribed with an unheard sound or echoes of voices from the past. The soundtrack’s musical composition is interlaced with a voice-over which draws on Rainer Maria Rilke’s text 'Primal Sound', where he reflects on the possibility of playing the coronal suture of a skull with a phonograph needle. The film uses microscopic photography, scanning electron microscopy, and sounds of otoacoustic emissions to uncover haunting aural bonescapes. The voiceovers too are recorded using old sound technology as a filter - writing and over-writing of wax cylinder to create unexpected scratches, glitches, loops and echoes. Exhibitions: shown as multi-channel sound/film installation AV festival (Newcastle 2010); solo exhibition at Wellcome Collection (London 2010-11); group exhibition ‘Samsung Art+ Prize’ BFI Southbank (London 2012); group exhibition ‘Transcendence’, Gertrude Contemporary, Melbourne (2014); solo exhibition as part of the International Rotterdam Film Festival (2013); group exhibition ‘The Sight of Sound’, Deutsche Bank VIP Lounge, Frieze Art Fair, NY (2012). Screenings: mini-retrospective at the Lincoln Centre, NY, as part of the New York Film Festival (2013); Jarman Award Tour screenings (2012, venues included Whitechapel Gallery, London; FACT, Liverpool; CCA, Glasgow; The Northern Charter in partnership with CIRCA projects; Nottingham Contemporary, Nottingham; Watershed, Bristol; Duke of York Cinema, Brighton), Whitechapel Gallery, London; FACT, Liverpool; CCA, Glasgow; The Northern Charter in partnership with CIRCA projects, Newcastle (special Q&A Aura Satz with Rebecca Shatwell, director of AV festival); Nottingham Contemporary, Nottingham; Watershed, Bristol; Duke of York Cinema, Brighton; Mini-retrospective at Tate Britain (London 2014); Mini-retrospective screening, DIM Cinema, The Cinematheque (Vancouver 2015); Mini-retrospective at Whitechapel Gallery (London 2016). Publications: ‘Sound Seam’ booklet with contributions by Steven Connor and Tom McCarthy (2010).

Symposium: Editing Political Diaries

The witness seminar was held in December 1991 at the Institute of Historical Research in London. It examined some of the key issues surrounding the editing of political diaries, including what to edit, the motivation of the diarist and the value of diaries to historians. Peter Catterall of the ICBH was in the chair. The three principal speakers were Ruth Winstone, editor of Tony Benn's diaries, David Brooks, editor of the diary of Sir Edward Hamilton, and John Barnes, co‐editor with David Nicholson, of the diary of Leo Amery. Other contributors included Jad Adams (biographer of Tony Benn), Kathleen Burk (co‐author of a study of the 1976 IMF crisis), Philip Williamson (editor of the diary of William Bridgeman), M.R.D. Foot (an editor of the Gladstone diaries), and Stuart Ball (editor of the diary of Sir Cuthbert Headlam).

Letter - Wilfrid Laurier to A. Munro Grier, 18 September 1901

A letter from Prime Minister Wilfrid Laurier to A. Munro Grier regarding an invitation to His Royal Highness. This is possibly referencing the Royal visit of the Duke of Cornwall in the year 1901. The Royals were due to tour Canada September and October of that year, with a stop in the Niagara area October 13th.

[British Parliamentary papers], Session 24 November, 1812 - 22 July, 1813. Vol. XIV, Correspondence and treaties with foreign powers.

Most of this volume consists of correspondence between high ranking U.S. and British statesmen. E.g., James Madison, James Monroe, The Marquess Wellesley (brother of Arthur Wellesley, Duke of Wellington). The discussion centers around the War of 1812. Also includes facsimilies of treaties signed between Great Britain and Sweden, Russia and Sicily.

Le pouvoir communal et l'émancipation urbaine au XVe siècle : le cas de la ville de Liège (1400-1455)

La ville de Liège, à la fin du Moyen Âge, fut le théâtre de l’affirmation de ses bourgeois par l’entremise des corporations de métier et des institutions communales. Le XIVe siècle fut en effet marqué par des gains communaux importants au détriment, d’une part, du patriciat urbain, d’autre part, du prince-évêque de Liège. À partir de 1384, le Conseil liégeois, entièrement entre les mains des artisans, possédait des prérogatives étendues dans l’administration et la gestion de la ville. Toutefois, la progression du pouvoir bourgeois se trouva brusquement stoppée, pour une dizaine d’années, lors de la défaite liégeoise d’Othée, en 1408. Ce mémoire porte sur l’évolution du pouvoir communal liégeois dans la première moitié du XVe siècle, moins bien connue des historiens. L’étude de la chronique de Jean de Stavelot permet de mettre en lumière cette période trouble. La défaite d’Othée de même que les réformes imposées par les princes-évêques causèrent notamment de grands bouleversements. Des partis politiques entrèrent aussi en scène et la présence voisine du puissant duc de Bourgogne influença la vie des Liégeois. Ces particularités issues du contexte politique et social sont autant d’éléments qui influèrent sur la volonté d’affirmation des bourgeois et l’exercice du pouvoir communal à Liège.