Search results for "550"

Fractional-Order Partial Cancellation of Integer-Order Poles and Zeros

2022

The key idea of this contribution is the partial compensation of non-minimum phase zeros or unstable poles. Therefore the integer-order zero/pole is split into a product of fractional-order pseudo zeros/poles. The amplitude and phase response of these fractional-order terms is derived to include these compensators into the loop-shaping design. Such compensators can be generalized to conjugate complex zeros/poles, and also implicit fractional-order terms can be applied. In the case of the non-minimum phase zero, its compensation leads to a higher phase margin and a steeper open-loop amplitude response around the crossover frequency resulting in a reduced undershooting in the step-response, a…

Models, systems, and descriptions - A cross-disciplinary reflection on models

2023

There are many different notions of models in different areas of science that are often not aligned, making it difficult to discuss them across disciplines. In this study, we look at the differences between physical models and mental models as well as the difference between static and dynamic models. Semiotics provides a philosophical underpinning by explaining meaning-making. This allows for identifying a common ground between models in different areas. We use examples from natural sciences and linguistics to illustrate different approaches and concepts and to find commonalities. This study distinguishes between systems, models, and descriptions of models. This distinction allows us to und…

Using transfer coefficients to model series-connected multi-junction solarcells with radiative coupling

2023

Author's accepted manuscript This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Strandberg, R. (2023). Using transfer coefficients to model series-connected multi-junction solar cells with radiative coupling. Applied Physics Letters, 122(25), 1-6 and may be found at https://doi.org/10.1063/5.0152026. When the quality of multi-junction solar cells becomes sufficiently high, radiative exchange of photons between cells must be included to properly model such devices. In this work, it is shown how constants called transfer coefficients can account for radiative coupling in series-connected mult…

An Access Control Model to Facilitate Healthcare Information Access in Context of Team Collaboration

2018

The delivery of healthcare relies on the sharing of patients information among a group of healthcare professionals (so-called multidisciplinary teams (MDTs)). At present, electronic health records (EHRs) are widely utilized system to create, manage and share patient healthcare information among MDTs. While it is necessary to provide healthcare professionals with privileges to access patient health information, providing too many privileges may backfire when healthcare professionals accidentally or intentionally abuse their privileges. Hence, finding a middle ground, where the necessary privileges are provided and malicious usage are avoided, is necessary. This thesis highlights the access c…

The Hierarchical Discrete Learning Automaton Suitable for Environments with Many Actions and High Accuracy Requirements

2022

Author's accepted manuscript Since its early beginning, the paradigm of Learning Automata (LA), has attracted much interest. Over the last decades, new concepts and various improvements have been introduced to increase the LA’s speed and accuracy, including employing probability updating functions, discretizing the probability space, and implementing the “Pursuit” concept. The concept of incorporating “structure” into the ordering of the LA’s actions is one of the latest advancements to the field, leading to the ϵ-optimal Hierarchical Continuous Pursuit LA (HCPA) that has superior performance to other LA variants when the number of actions is large. Although the previously proposed HCPA is …

Learning automata based energy-efficient AI hardware design for IoT applications: Learning Automata based AI Hardware

2020

On Novel Variants of the Hierarchical Stochastic Searching on the Line

2012

Master's thesis Mechatronics MAS500 - University of Agder, 2012 Konfidensiell til / confidential until 01.07.2017

Detection of Depression Using Weighted Spectral Graph Clustering With EEG Biomarkers

2023

The alarming annual growth in the number of people affected by Major Depressive Disorder (MDD) is a problem on a global scale. In the primary scrutiny of depression, Electroencephalography (EEG) is one of the analytical tools available. Machine Learning (ML) and Deep Neural Networks (DNN) methods are the most common techniques for MDD diagnosis using EEG. However, these ML methods heavily rely on manually annotated EEG signals, which can only be generated by experts, for training. This also necessitates a large amount of memory and time constraints. The requirement of huge amounts of data to foresee emerging tendencies or undiscovered alignments is enforced. This article develops an unsuper…

Towards Thompson Sampling for Complex Bayesian Reasoning

2020

Paper III, IV, and VI are not available as a part of the dissertation due to the copyright. Thompson Sampling (TS) is a state-of-art algorithm for bandit problems set in a Bayesian framework. Both the theoretical foundation and the empirical efficiency of TS is wellexplored for plain bandit problems. However, the Bayesian underpinning of TS means that TS could potentially be applied to other, more complex, problems as well, beyond the bandit problem, if suitable Bayesian structures can be found. The objective of this thesis is the development and analysis of TS-based schemes for more complex optimization problems, founded on Bayesian reasoning. We address several complex optimization proble…

SECURITY ON THE MIS AND THE INTERFACING MODEM

2012

Master's thesis Mechatronics MAS500 - University of Agder, 2012 Konfidensiell til / confidential until 01.07.2017