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1	Applying Artificial Neural Networks to Reduce the Adaptation Space in Self-Adaptive Systems : an exploratory work Buttar, Sarpreet Singh January 2019 (has links) Self-adaptive systems have limited time to adjust their configurations whenever their adaptation goals, i.e., quality requirements, are violated due to some runtime uncertainties. Within the available time, they need to analyze their adaptation space, i.e., a set of configurations, to find the best adaptation option, i.e., configuration, that can achieve their adaptation goals. Existing formal analysis approaches find the best adaptation option by analyzing the entire adaptation space. However, exhaustive analysis requires time and resources and is therefore only efficient when the adaptation space is small. The size of the adaptation space is often in hundreds or thousands, which makes formal analysis approaches inefficient in large-scale self-adaptive systems. In this thesis, we tackle this problem by presenting an online learning approach that enables formal analysis approaches to analyze large adaptation spaces efficiently. The approach integrates with the standard feedback loop and reduces the adaptation space to a subset of adaptation options that are relevant to the current runtime uncertainties. The subset is then analyzed by the formal analysis approaches, which allows them to complete the analysis faster and efficiently within the available time. We evaluate our approach on two different instances of an Internet of Things application. The evaluation shows that our approach dramatically reduces the adaptation space and analysis time without compromising the adaptation goals. Self-Adaptive Systems Self-Adaptation Architecture-Based Adaptation Autonomous Systems Cyber-Physical Systems CPS DeltaIoT IoT ActivFORMS MAPE-K Feedback Loop Runtime Uncertainties Adaptation Space Analysis Machine Learning Artificial Neural Network ANN Online Learning Deep Learning Online Supervised Learning Incremental Learning Classification Multi-Layer Perceptron MLP Computer Sciences Datavetenskap (datalogi) Control Engineering Reglerteknik Software Engineering Programvaruteknik

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Applying Artificial Neural Networks to Reduce the Adaptation Space in Self-Adaptive Systems : an exploratory work