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Visible light communication based system using high power LED and dicode pulse position modulation technique
Full text linkIn this paper a dicode pulse position modulation (DiPPM) technique has been successfully implemented for an indoor visible light communication (VLC) based system using an FPGA and a commercial high power white LED (30W). A data rate of 13 Mbps has been achieved with a bit error rate (BER) <10-11 at a free space distance of 1.2 m through a basic transceiver circuit, and 14.5 Mbps with 1.15x10-6 of BER. Furthermore, a data rate of 13 Mbps has been successfully transmitted over a distance of 1.8 m with BER of 10-5. This proves that the application of DiPPM is a viable modulation system over free space communication links
Contextualizing entrepreneurial identity amongst Syrian refugees in Jordan: the emergence of a destabilized habitus?
No full textThis paper aims to contextualise the entrepreneurial identity of Syrian refugees living
outside refugee camps in Jordan. The research adopts a social lens to consider the situation
Syrians find themselves in by drawing on the work of Bourdieu. A qualitative design is
applied to explore the different experiences and perceptions that pervade refugee stories and
the work of refugee aid agencies. By contextualising entrepreneurial identity in the
Jordanian context, the paper reveals how a destabilized refugee habitus based on an
embodied disposition of survivability is emerging. The paper makes an empirical and
conceptual contribution by highlighting how the entrepreneurial activities of Syrian refugees
are driven by their experiences of the harsh social conditions they find themselves in
GraphBAD: A General Technique for Anomaly Detection in Security Information and Event Management
Full text linkThe reliance on expert knowledge—required for analysing security logs and performing security audits—has created an unhealthy balance, where many computer users are not able to correctly audit their security configurations and react to potential security threats. The decreasing cost of IT and the increasing use of technology in domestic life are exacerbating this problem, where small companies and home IT users are not able to afford the price of experts for auditing their system configuration. In this paper, we present GraphBAD, a graph-based analysis tool that is able to analyse security configurations in order to identify anomalies that could lead to potential security risks. GraphBAD, which does not require any prior domain knowledge, generates graph-based models from security configuration data and, by analysing such models, is able to propose mitigation plans that can help computer users in increasing the security of their systems. A large experimental analysis, conducted on both publicly available (the well-known KDD dataset) and synthetically generated testing sets (file system permissions), demonstrates the ability of GraphBAD in correctly identifying security configuration anomalies and suggesting appropriate mitigation plans
Social work, poverty, and child welfare interventions
Full text linkThe relationship between children's material circumstances and child abuse and neglect raises a series of questions for policy, practice, and practitioners. Children and families in poverty are significantly more likely to be the subject of state intervention. This article, based on a unique mixed‐methods study of social work interventions and the influence of poverty, highlights a narrative from practitioners that argues that, as many poor families do not harm their children, it is stigmatizing to discuss a link between poverty and child abuse and neglect. The data reveal that poverty has become invisible in practice, in part justified by avoiding stigma but also because of a lack of up‐to‐date research knowledge and investment by some social workers in an “underclass” discourse. We argue, in light of the evidence that poverty is a contributory factor in the risk of harm, that it is vital that social work engages with the evidence and in critical reflection about intervening in the context of poverty. We identify the need for fresh approaches to the harms children and families face in order to support practices that engage confidently with the consequences of poverty and deprivatio
Design and construction of a two-stage thermoacoustic electricity generator with push-pull linear alternator
Full text linkTravelling-wave thermoacoustic heat engine is capable of converting heat to acoustic power which in turn can be used to generate electricity by a linear alternator. The thermoacoustic heat engine can work in a wide range of heat quality, giving it the ability to be used for waste heat recovery. In this paper, a new configuration of looped-tube travelling wave thermoacoustic engine is proposed, which consists of two identical stages each having a power extraction point, and the linear alternator connecting these two points working in “push-pull” mode. This enables a more effective acoustic impedance matching compared to the use of multiple linear alternators known in the literature. The laboratory demonstrator has been designed, built and tested. The applied heat source temperature is similar to that of the internal combustion engine exhaust gases in order to explore the potential of using the device for waste heat recovery from road or marine transport. In experiments, the maximum electric power of 48.6 W at thermal-to-electric efficiency of around 6% was achieved with helium at 28 bar as working fluid and 297 K temperature difference across the regenerator. The performance of the device has been analysed and compared to modelling performed using DeltaEC simulation tool
University rankings: What do they really show?
Full text linkUniversity rankings as developed by the media are used by many stakeholders in higher education: students looking for university places; academics looking for university jobs; university managers who need to maintain standing in the competitive arena of student recruitment; and governments who want to know that public funds spent on universities are delivering a world class higher education system. Media rankings deliberately draw attention to the performance of each university relative to all others, and as such they are undeniably simple to use and interpret. But one danger is that they are potentially open to manipulation and gaming because many of the measures underlying the rankings are under the control of the institutions themselves. This paper examines media rankings (constructed from an amalgamation of variables representing performance across numerous dimensions) to reveal the problems with using a composite index to reflect overall performance. It ends with a proposal for an alternative methodology which leads to groupings rather than point estimates
Tracking digital ulcers in systemic sclerosis: A feasibility study assessing lesion area in patient recorded smartphone photographs
Full text linkInitial Approaches to Idiomatic Contemporary Writing for a Musical Instrument: Discovering Methods of Practice-Based Research
Full text linkUsing the flute as a case study, this article discusses the approach to writing for an instrument for the first time in a contemporary style. From the viewpoint of a student composer, it acts as a candid account of the issues a student may face in the early stages of contemporary study and practice, giving insight into the diverse approach to research that composers take. Much of the pedagogic literature on the compositional process is written by expert composers with decades of experience, and often does not consider the ‘rookie errors’ that many student composers incur in their early attempts at idiomatic writing. The article is not, however, a how-to guide for writing for the flute. It simply uses the flute as an example towards a research model for any instrument, discussing the physics behind playing it, the use of extended techniques, and approach to musical material. My short piece for solo flute, reflection of light is either specular or diffuse (Kirk, 2016) (Figure 7 in Appendix 1), exemplifies successful idiomatic writing for the instrument
Equality on the Bus: Case Comment on Paulley v FirstGroup Plc
Full text linkThe Equality Act 2010 imposes a duty on employers and organisations to make sure that disabled people have easy access to education, jobs and services. This ensures that they are treated equally with non-disabled people.
Over the years, employers have been looked down upon for failing to make reasonable adjustments for disabled people by both the EHRC and judges. There seems to be much more focus on how and why employers should treat disabled people equally, leaving organisations and service providers behind. As a result, there has not been much deliberation on how far service providers should go when making reasonable adjustments for disabled people.
Paulley v FirstGroup Plc is the first case of its kind to discuss the duty upon service providers to make reasonable adjustments to their services for disabled people. It has therefore been quite a contentious case, attracting mixed opinions from academics and disability and equality supporters. This article sets out the key facts of the case, followed by the judge’s reasoning, judgment and analysis. Essentially, the main question the decision in this case raises is whether it has struck a balance between disabled people’s rights to freedom from discrimination and the reasonable adjustments that service providers are required to make
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