124 research outputs found

    Strategies for protecting intellectual property when using CUDA applications on graphics processing units

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    Recent advances in the massively parallel computational abilities of graphical processing units (GPUs) have increased their use for general purpose computation, as companies look to take advantage of big data processing techniques. This has given rise to the potential for malicious software targeting GPUs, which is of interest to forensic investigators examining the operation of software. The ability to carry out reverse-engineering of software is of great importance within the security and forensics elds, particularly when investigating malicious software or carrying out forensic analysis following a successful security breach. Due to the complexity of the Nvidia CUDA (Compute Uni ed Device Architecture) framework, it is not clear how best to approach the reverse engineering of a piece of CUDA software. We carry out a review of the di erent binary output formats which may be encountered from the CUDA compiler, and their implications on reverse engineering. We then demonstrate the process of carrying out disassembly of an example CUDA application, to establish the various techniques available to forensic investigators carrying out black-box disassembly and reverse engineering of CUDA binaries. We show that the Nvidia compiler, using default settings, leaks useful information. Finally, we demonstrate techniques to better protect intellectual property in CUDA algorithm implementations from reverse engineering

    Intra-breath changes in respiratory mechanics assessed from multi-frequency oscillometry measurements

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    Objective. Recent studies in respiratory system impedance (Zrs) with single-frequency oscillometry have demonstrated the utility of novel intra-breath measures of Zrs in the detection of pathological alterations in respiratory mechanics. In the present work, we addressed the feasibility of extracting intra-breath information from Zrs data sets obtained with conventional oscillometry. Approach. Multi-frequency recordings obtained in a pulmonology practice were re-analysed to track the 11 Hz component of Zrs during normal breathing and compare the intra-breath measures to that obtained with a single 10 Hz signal in the same subjects. A nonlinear model was employed to simulate changes in Zrs in the breathing cycle. The values of resistance (R) and reactance (X) at end expiration and end inspiration and their corresponding differences (Delta R and Delta X) were compared. Main results. All intra-breath measures exhibited similar mean values at 10 and 11 Hz in each subject; however, the variabilities were higher at 11 Hz, especially for Delta R and Delta X. The poorer quality of the 11 Hz data was primarily caused by the overlapping of modulation side lobes of adjacent oscillation frequencies. This cross-talk was enhanced by double breathing frequency components due to flow nonlinearities. Significance. Retrospective intra-breath assessment of large or special data bases of conventional oscillometry can be performed to better characterise respiratory mechanics in different populations and disease groups. The results also have implications in the optimum design of multiple-frequency oscillometry (avoidance of densely spaced frequencies) and the use of filtering procedures that preserve the intra-breath modulation information

    Understanding trust and confidence in web behaviour

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    Trust is recognised as the construct that makes societies function; not only this but it is understood to be the element that makes them successful, wealthier, healthier and wiser. A problem of the trust construct is that, despite its perceived importance on facilitating modern life, it remains a subject that lacks consensus on its definition. Within literature, when the construct of trust is applied to the Web context, there is further confusion as the construct being referred to as trust in actual fact referring to the construct of confidence. This confusion led to the research in understanding trust and confidence in Web behaviour. In addition to researching the literature, the diary-study interview method was used to investigate into how the constructs of trust and confidence function on the Web. The diary study was designed to act as an observational research method, and in doing so would identify the what and how participants used the Web, with the follow-up interviews extracting the why.When taking the core-concept understanding of trust (as developed within this thesis), it shows there to be a disparity between trust and its applicability to the Web. The study further supports this view, and from this emerges the key finding that Web interactions are facilitated and driven by confidence – not trust. Confidence is the construct that drives the Web; what impacts and influences the behaviour of its users. Secondly, and more crucially, confidence is a construct that cannot be created on the Web per se. It is shaped by an individuals' worldview (optimistic / pessimistic), their disposition to risk, their cultural tendencies, their personalities, all of which are factors that are influenced by, and built up on, real-world experiences. Put simply, confidence is created through real-world experiences and it is the real-world atti-tude of an individual that is carried over to govern the nature of their Web interactions

    Implementing sustainable supply chain initiatives in the South African road freight industry

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    Abstract: Background: Fundamental changes in the global economy have resulted in complex supply chains that require continuous strategic adjustment in order to remain relevant, competitive and sustainable. Increased use of road freight transport has resulted in an increase in global greenhouse gas (GHG) emissions and impacts climate change. Purpose: This study sought to explore the implementation of sustainable supply chain practices aimed to reduce GHG emissions in the South African road freight industry. Method: Empirical data were collected from a convenience sample of 108 supply management profesionals employed at 13 logistics operating firms based in South Africa. Findings: The results indicate that firms are placed under immense pressure to implement sustainable practices. The main drivers for adopting sustainable initiatives are pressure from consumer and brand protection; pressure from top management; and cost saving and revenue. The most implemented initiative identified is eco-driving, eco-routing (routing and scheduling) and increasing vehicle carrying capacity. The main benefits derived from implementing sustainable supply chain initiatives were operational cost savings; increased competitive advantage; and improved supplier relationships. However, the main challenges associated with implementing these initiatives were lack of government support; lack of understanding of the cost; and insufficient manpower..

    Sustainable supply chain initiatives in reducing greenhouse gas emission within the road freight industry

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    Background: Global supply chains have evolved from a traditional simple supply chain to one that is filled with complexities and uncertainties. The increase in road freight transportation has resulted in an escalation in the emission of greenhouse gases (GHG) into the atmosphere, impacting climate change. Objectives: The purpose of this article was to investigate the implementation of sustainable supply chain initiatives in reducing GHG emissions within the South African road freight transport industry. Method: This research utilised a case study approach and used primary data, obtained through self-administered questionnaires, to explore the adopting sustainable transport management practices. Results: The main drivers for implementing sustainable initiatives are pressure from consumer and brand protection, pressure from top management, and cost saving and revenue. Eco-driving, eco-routing and increasing vehicle carrying capacity are the most adopted sustainable supply chain initiatives implemented. The key benefits resulting from implementing sustainable initiatives were operational cost savings, improved competitive advantage and enhanced supplier relationships. Also, the lack of government support, lack of understanding of the cost and insufficient manpower were identified as the foremost challenges associated with the implementation of these sustainable initiatives. Conclusion: The results reveal that organisations are placed under enormous pressure to implement sustainable practices. This study identifies various sustainable initiatives to reduce GHG emissions and addresses the associated benefits and challenges when implementing these initiatives

    Proposed vitamin A supplementation programme for South Africa - design, coverage and cost

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    Background. A national survey of the micronutrient status of preschool children in South Africa established that vitamin A deficiency is a significant public health problem, requiring urgent attention. A number of immediate and long-term intenrentions were recommended, including the introduction of a vitamin A supplementation programme and a food fortification programme.Objectives. The aim of the study was to assist in the development and implementation of a national vitamin A supplementation programme at primary health care facilities for mothers and children. This was achieved by determining the design, coverage and cost of a national primary health care facility vitamin A supplementation programme.Methods. Based on an extensive review of the literature, the main components of a primary health care facility vitamin A supplementation programme were identified. The annual, recurrent cost of each of the programme component wer estimated for the nine provinces in South Africa. Immunisation coverage rates were used as a proxy for estimating the coverage of the programme.Results. The main components of the programme were identified as: promotion, training, purchase of vitamin A capsules, distribution of vitamin A capsules to primary health care facilities, clistribution of cap ule to the programme beneficiaries, and monitoring and evaluation. The programme would operate from primary health care facililities and would target all children between 6 and 24  months of age and newly delivered mothers. It was estimated that the programme would cover 74% of children and 95% of postpartum women nationally. The total annual, recurrent cost of the national programme was estimated at R16.4 million. The bulk of the costs would include personnel costs, comprising 68% of the total costs. Other costs included promotion (27%), vitamin A capsules (4%) and training (1%). The cost of the programme would vary significantly by province, but the provinces' average total cost per beneficiary would be similar.Conclusion. A primary health care facility vitamin A supplementation programme has been designed and accompanied by an estimated overall cost and coverage for implementation. The findings of the study showed that the programme would be financially feasible and would reach the majority of children under 24 months of age. It is recommended that further research be undertaken to extend the programme to the more 'hard to reach' population using other stategies such as mass immunisation campaigns

    Sustainable supply chain initiatives in reducing greenhouse gas emission within the road freight industry

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    Abstract: Global supply chains have evolved from a traditional simple supply chain to one that is filled with complexities and uncertainties. The increase in road freight transportation has resulted in an escalation in the emission of greenhouse gases (GHG) into the atmosphere, impacting climate change. Objectives: The purpose of this article was to investigate the implementation of sustainable supply chain initiatives in reducing GHG emissions within the South African road freight transport industry. Method: This research utilised a case study approach and used primary data, obtained through self-administered questionnaires, to explore the adopting sustainable transport management practices..

    Data-driven counterfactual evaluation of management outcomes to improve emergency conservation decisions

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    Monitoring is needed to assess conservation success and improve management, but naïve or simplistic interpretation of monitoring data can lead to poor decisions. We illustrate how to counter this risk by combining decision-support tools and quantitative counterfactual analysis. We analyzed 20 years of egg rescue for tara iti (Sternula nereis davisae) in Aotearoa New Zealand. Survival is lower for rescued eggs; however, only eggs perceived as imminently threatened by predators or weather are rescued, so concluding that rescue is ineffective would be biased. Equally, simply assuming all rescued eggswould have died if left in situ is likely to be simplistic. Instead, we used the monitoring data itself to estimate statistical support for a wide space of uncertain counterfactuals about decisions and fate of rescued eggs. Results suggest under past management, rescuing and leaving eggs would have led to approximately the same overall fledging rate, because of likely imperfect threat assessment and low survival of rescued eggs to fledging. Managers are currently working to improve both parameters. Our approach avoids both naïve interpretation of observed outcomes and simplistic assumptions thatmanagement is always justified, using the same data to obtain unbiased quantitative estimates of counterfactual support
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