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Search Results: 1 - 10 of 26344 matches for " Rhys Martin "
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Multiple-object tracking in cluttered and crowded public spaces
Rhys Martin,Ognjen Arandjelovi?
Computer Science , 2013, DOI: 10.1007/978-3-642-17277-9_10
Abstract: This paper addresses the problem of tracking moving objects of variable appearance in challenging scenes rich with features and texture. Reliable tracking is of pivotal importance in surveillance applications. It is made particularly difficult by the nature of objects encountered in such scenes: these too change in appearance and scale, and are often articulated (e.g. humans). We propose a method which uses fast motion detection and segmentation as a constraint for both building appearance models and their robust propagation (matching) in time. The appearance model is based on sets of local appearances automatically clustered using spatio-kinetic similarity, and is updated with each new appearance seen. This integration of all seen appearances of a tracked object makes it extremely resilient to errors caused by occlusion and the lack of permanence of due to low data quality, appearance change or background clutter. These theoretical strengths of our algorithm are empirically demonstrated on two hour long video footage of a busy city marketplace.
NDI of Rail Squats and Estimating Defect Size and Location Using Lock-In Thermography  [PDF]
Daren Peng, Rhys Jones
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.51005

Rail squats are a form of near surface rolling contact fatigue damage found in rail heads. Currently, the most popular method to detect the rail squats is utilizing ultrasonic techniques to determine their presence and measure their depths. This technique needs to be direct contact between the probe and the rail head, with a coupling fluid in at the interface. Other weaknesses of these ultrasonic techniques include false detections as well as missed detections. Infrared thermography is a relatively new non-destructive inspection technique used for a wide range of applications but is not used for rail squat detection. Lock-in thermography is a non-destructive inspection technique that can be used for the detection of near surface defects. It utilizes an infrared camera to detect the thermal waves and then produces a thermal image, which displays the local thermal wave variation in phase or amplitude. In inhomogeneous materials, the amplitude and phase of the thermal wave carries information related to both the local thermal properties and the nature of the structure being inspected. This comparison is then used to determine the phase angle difference (Δf) between the input and the thermal response of the object. The aim of this paper is to determine whether lock-in thermography can be used to firstly locate squats in rails, and secondly measure their depths. It has demonstrated the feasibility for using such a technique in generating thermal responses that could be adequately utilized for the purpose of defect characterization.

Finite Element Method Study on the Squats Growth Simulation  [PDF]
Daren Peng, Rhys Jones
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.45A004

A simplified finite element analysis on the squats growth simulation and the effect different contact stresses has been presented. This analysis is based on the element removal study to simulate squat growth in a rail track under cyclic loading. The major principal stress (maximum principal stress failure theory) has been used as failure criteria. Evolution strategies are derived from the biological process of evolution, to find squats growth path solution to a complex rail/ wheel contact problem.

The Expanding Zoo of Calabi-Yau Threefolds
Rhys Davies
Advances in High Energy Physics , 2011, DOI: 10.1155/2011/901898
Abstract: This is a short review of recent constructions of new Calabi-Yau threefolds with small Hodge numbers and/or nontrivial fundamental group, which are of particular interest for model building in the context of heterotic string theory. The two main tools are topological transitions and taking quotients by actions of discrete groups. Both of these techniques can produce new manifolds from existing ones, and they have been used to bring many new specimens to the previously sparse corner of the Calabi-Yau zoo, where both Hodge numbers are small. Two new manifolds are also obtained here from hyperconifold transitions, including the first example with fundamental group , the smallest non-Abelian group. 1. Introduction This paper is a short review of recent work on constructing smooth Calabi-Yau threefolds with interesting topological properties, such as small cohomology groups and nontrivial fundamental group. In practice, these two properties often go hand-in-hand, as emphasised in [1, 2]. The majority of known three-dimensional Calabi-Yau manifolds are constructed as complete intersections in higher-dimensional toric varieties [3–8]. Most of the new examples found in recent years are in fact obtained from these via one of two techniques. The first is to take the quotient by a holomorphic action of some finite group. As explained in Section 2, when the group action is fixed-point-free, this is guaranteed to yield another Calabi-Yau manifold, and many Calabi-Yau threefolds with nontrivial fundamental group have been constructed in this way. Several early examples can be found in [9–14], but recent efforts have brought to light many more [2, 15–26], some of which will be discussed later. In the case that the group action has fixed points, it is often possible to resolve the resulting orbifold singularities in such a way as to again obtain a Calabi-Yau manifold. Examples can be found in [27–29]. The second technique is to vary either the complex structure or K?hler moduli of a known space until it becomes singular and then desingularise it by varying the other type of moduli. Topologically, such a process is a surgery and yields a Calabi-Yau manifold topologically distinct from the original. Two classes of such topological transitions, the conifold and hyperconifold transitions, are discussed in Section 3, and explicit examples of each are given. Conifold transitions have been known for some time to connect many Calabi-Yau threefolds [30–33] and have been used to construct new manifolds in [2, 24, 34, 35]. Hyperconifold transitions were described in [36], and the
Diabetes mellitus type 2: structured care and education
Rhys Williams
International Journal of Integrated Care , 2001,
China’s impact on Latin America
Rhys Jenkins
Revista CIDOB d'Afers Internacionals , 2009,
Abstract: China’s rapid economic growth and increased openness has been one of the most significant developments in the global economy over the past 25 years. This paper analyses China’s impacts on the Latin American economies, and in particular the challenges that China poses for the region. It discusses both the direct impacts arising from bilateral trade and investment flows between China and Latin America, the indirect impacts associated with Chinese competition in export markets and for foreign direct investment, and the positive terms of trade effects resulting from China’s increased demand for raw materials. Challenges identified include the recent rapid increase of competition from Chinese imports in the Latin American market, the concentration of exports to China in a narrow range of primary products and the uneven distribution of profits from trade with China within Latin America.
China and Brazil: Economic Impacts of a Growing Relationship
Rhys Jenkins
Journal of Current Chinese Affairs , 2012,
Abstract: The paper analyses the economic impacts of China’s re-emergence on Brazil, looking at both the direct effects of China on Brazil in terms of bilateral trade and investment flows and the indirect effects through increased competition in export markets for manufactured goods and higher world prices for primary commodities. Despite a surge in Chinese FDI in Brazil in 2010, the main driver of bilateral relations is trade. While bilateral trade has grown rapidly, the pattern that has emerged has given rise to concern because Brazil’s exports are concentrated in a small number of primary products while imports from China are almost entirely of manufactured goods that are becoming more technologically sophisticated over time. Brazil has benefitted in the short term from the high prices of primary commodities (partly caused by growing Chinese demand), but has lost export markets to China in manufactures, contributing to the “primarization” of the country’s export basket.
Twelve Weeks of Ice Cubes: A Short Story
Rhys Evans
Irish Journal of Applied Social Studies , 2006,
Childhood obesity control strategy under preparation
Williams Rhys
Bulletin of the World Health Organization , 2002,
Comment on 'The role of 3-D interactive visualization in blind surveys of HI in galaxies'
Rhys Taylor
Physics , 2015,
Abstract: Punzo et al. (2015) recently reported on the state of the art for visualisation of H I data cubes. I here briefly describe another program, FRELLED, specifically designed for dealing with H I data. Unlike many 3D viewers, FRELLED can handle astronomical world coordinates, easily and interactively mask and label specific volumes within the data, overlay optical data from the SDSS, generate contour plots and renzograms, make basic spectral profile measurements via an interface with MIRIAD, and can switch between viewing the data in 3D and 2D. The code is open source and can potentially be extended to include any astronomical function possible with Python, displaying the result in an interactive 3D environment.
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