Greater London, England, United Kingdom
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Lively and dedicated Senior Engineering Leader specialising in large-scale transformation…

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  • Arenko Group

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  • Certified Scrum Master

    Scrum Alliance

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Publications

  • Innate and acquired immunity in real time systems

    IEEE

    In most potential industrial applications of artificial immune systems for early fault detection, some form of simple fault detection system already exists. We propose that this existing layer of simple, generally rule-based fault detection is analogous to innate immunity in the natural immune system. We argue that the artificial acquired immune system should focus on the detection of fault conditions not already covered by the innate immune system, most importantly on the very early symptoms…

    In most potential industrial applications of artificial immune systems for early fault detection, some form of simple fault detection system already exists. We propose that this existing layer of simple, generally rule-based fault detection is analogous to innate immunity in the natural immune system. We argue that the artificial acquired immune system should focus on the detection of fault conditions not already covered by the innate immune system, most importantly on the very early symptoms of faults which, we believe, are often very similar to self. This has implications for detector generation algorithms. We test two novel detector generation algorithms that address this issue, using temperature data from refrigerated cabinets in UK supermarkets. Results show that location of detectors in problem space is important and that detector sets concentrated close to self in problem space are better at detecting early stages of fault.

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  • An Investigation of the Negative Selection Algorithm for Fault Detection in Refrigeration Systems

    Springer

    Failure of refrigerated cabinets costs millions annually to supermarkets, and a large market exists for systems which can predict such failures. Previous work, now moving towards deployment, has used neural networks to predict volumes of alarms from refrigeration system controllers, and also to predict likely refrigerant gas loss. Here, we use in-cabinet temperature data, aiming to predict faults from the pattern of temperature over time. We argue that artificial immune systems (AIS) are…

    Failure of refrigerated cabinets costs millions annually to supermarkets, and a large market exists for systems which can predict such failures. Previous work, now moving towards deployment, has used neural networks to predict volumes of alarms from refrigeration system controllers, and also to predict likely refrigerant gas loss. Here, we use in-cabinet temperature data, aiming to predict faults from the pattern of temperature over time. We argue that artificial immune systems (AIS) are particularly appropriate for this, and report a series of preliminary experiments which investigate parameter and strategy choices. We also investigate a ‘differential’ encoding scheme designed to highlight essential elements of in-cabinet temperature patterns. The results prove feasibility for AIS in this application, with good self-detection rates, and a promising fault-detection rate. The best configuration of those examined seems to be that which uses the novel differential encoding with r-bits matching.

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  • Predicting alarms in supermarket refrigeration systems using evolved neural networks and evolved rulesets

    Supermarkets suffer serious financial losses owing to
    problems with their refrigeration systems. Most refrigeration
    units have controllers which output "high-temperature" and
    similar alarms. We describe a system developed to predict
    alarm volumes from this data in advance, and compare evolved
    and backpropogation-trained neural networks, and evolved
    rulesets for this task.

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