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  • Toward a Formalism for Conservative Claims about the Dependability of Software-Based Systems

    In recent work, we have argued for a formal treatment of confidence about the claims made in dependability cases for software-based systems. The key idea underlying this work is "the inevitability of uncertainty": It is rarely possible to assert that a claim about safety or reliability is true with certainty. Much of this uncertainty is epistemic in nature, so it seems inevitable that expert judgment will continue to play an important role in dependability cases. Here, we consider a simple ca...

    "Trial by media": Policing, the 24-7 news mediasphere and the "politics of outrage"

    This article analyses the changing nature of news media—police chief relations. Building on previous research (Greer and McLaughlin, 2010), we use the concepts of ‘inferential structure’ (Lang and Lang, 1955) and ‘hierarchy of credibility’ (Becker, 1967) to examine former Metropolitan Police Service (MPS) Commissioner Sir Ian Blair’s ‘trial by media’. We focus on the collective and overwhelmingly hostile journalistic reaction to Blair’s declaration in 2005 that: (a) the news media are guilty ...

    System and component modelling and optimisation for an efficient 10 kWe low-temperature organic Rankine cycle utilising a radial inflow expander

    Small-scale (10 kWe) organic Rankine cycles for low temperature applications such as heat recovery and solar power present a significant development opportunity but limited prototypes have been developed. This paper aims to address this by describing a system modelling tool which is used to select a working fluid, optimise cycle conditions, and preliminarily size a radial inflow rotor for an experimental test rig. The program is a steady-state sizing and optimisation tool which advances on cu...

    Measuring the business success of enterprise systems projects

    Enterprise resource planning (ERP) systems are integrated application software packages that meet most of the information systems requirements of business organisations. ERP, or more simply enterprise systems (ES), have constituted the majority of investment in information technology by global businesses over the last two decades and have had a profound impact upon the way these businesses have been managed. Yet there is not a good understanding of how the business success, as opposed to the ...

    Predicting the evaporation rate of stationary droplets with the VOF methodology for a wide range of ambient temperature conditions

    This paper presents CFD predictions for the evaporation of nearly spherical suspended droplets for ambient temperatures in the range 0.56 up to 1.62 of the critical fuel temperature, under atmospheric pressures. The model solves the Navier-Stokes equations along with the energy conservation equation and the species transport equations; the Volume of Fluid (VOF) methodology has been utilized to capture the liquid-gas interface using an adaptive local grid refinement technique aiming to minimiz...
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