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Experimental Investigation of Free Space Optical Channel Performance in the Arctic Weather
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-11-07)This paper investigates the technical aspects of the 1550 nm free space optical (FSO) link in extreme Arctic weather, specifically in falling snow, which is currently understudied. We measured the time variation of the received optical power in many snowfall events and derived attenuation statistics. Continuous measurements allowed us to estimate attenuation under varying temperatures and humidity ... -
Performance optimization for hybrid TS/PS SWIPT UAV in cooperative NOMA IoT networks
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-29)This study examines a cooperative non-orthogonal multiple access (NOMA) network utilizing an energy-constrained unmanned aerial vehicle (UAV) relay (UAVR) to expand coverage and improve network throughput. In order to provide energy to the UAVR, we consider the hybrid simultaneous wireless information and power transmission (SWIPT) method, which allows the UAVR to harvest energy from the source ... -
Teaching Linear Algebra to Engineering Students in Two Different Educational Settings: Design and Learning Outcomes
(Journal article; Tidsskriftartikkel, 2024-02-16)The present paper holds a twofold perspective on a new teaching format in a linear algebra course given to engineering students. The design resembles the flipped classroom, but with various adjustments. The first part highlights the basis on which the design was built, both research results and practical issues, but also the implementation of the teaching. It did not proceed quite as expected. The ... -
Non-directional Overcurrent Protection Relay Testing Using Virtual Hardware-in-the-Loop Device
(Chapter; Bokkapittel, 2023-05-17)Protective relays are an integral part of the power grid, making it reliable and secure against abnormal conditions. Hardware-in-the-Loop (HIL) can be employed to test and validate digital protective relay devices in the real-time simulation comprising hardware and software before actual implementation. However, the HIL technique requires a complex and high-cost technical environment consisting of ... -
Take-Home Exams in University Mathematics and Science Subjects: Some Ethical Considerations
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024)This article addresses some challenging perspectives related to offering take-home exams in mathematics at university level. The challenges arose during work on a previous article where four perspectives originating from Bjerrum Nielsen’s framework (2003) were used to analyze universities’ assessment methods during the Covid lockdown in our country. The perspectives had some ethical considerations ... -
Stabilization of Non-Cooperative Satellites in Low Earth Orbits using Inter-Satellite Atmospheric Drag
(Chapter; Bokkapittel, 2023-08-07)This paper presents a novel solution to the problem of stabilization of non-cooperative satellites in low Earth orbits, which utilizes inter-satellite aerodynamic drag effects for generation of aerodynamics moments in the wake of a controlled satellite. Hence, by altering the position of a smaller controlled satellite, we are able to change the wake region and thus provide aerodynamic moments for ... -
Under Seawater Capacitive Power Transfer for Maritime Charging Applications
(Chapter; Bokkapittel, 2023-09-12)Underwater capacitive power transfer (CPT) can provide an inexpensive and light electric charging solution with good misalignment tolerance for unmanned maritime vehicles. This paper investigates the effect of the changing of the frequency and the distance on the power transfer and overall efficiency of the underwater CPT system, considering the dielectric losses of the medium. It also proposes and ... -
Home Load Disaggregation using Deep Learning and Bayesian Optimization: A Case Study in Arctic Climate in Northern Norway
(Chapter; Bokkapittel, 2023-08-03)Load monitoring is an essential task in energy management systems. In this paper, an approach that relies on a long short-term memory (LSTM) model and a discrete wavelet transform (DWT) filter is presented to estimate the energy usage of flexible appliances. In the preprocessing stage, the main features of the aggregated power signal are extracted using DWT. Deep learning methods are very sensitive ... -
Classification of bulk cargo types stored openly at ports using CNN
(Chapter; Bokkapittel, 2023-10-20)In this paper, we present a novel concept of tracking cargoes at open ports using remote sensing images and convolution neural network (CNN) to classify various dry bulk commodities. The dataset used is prepared using Sentinel-2 atmospherically corrected (Sentinel-2 L2A) images covering 12 spectral bands. There are total 4995 labeled and geo-referenced images for four different cargoes-bauxite, coal, ... -
Digital Controller Design and Implementation for AC and DC Side of 3ph qZSI
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-09-28)This article presents the multi-loop digital controller design of a quasi-z-source inverter (qZSI). The qZSI is a single-stage power converter and can operate in buck and boost modes. The qZSI is an economical solution for distributed generation and eliminates the need for two-stage power conversion. This article proposes a detailed step-wise digital controller design using a multi-loop control ... -
Performance Analysis of Bidirectional Multi-Hop Vehicle-to-Vehicle Visible Light Communication
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-11-14)Vehicular visible light communication (VVLC) has emerged as a promising field of research, garnering considerable attention from scientists and researchers. VVLC offers a potential solution to enable connectivity and communication between travelling vehicles along the road by using their existing headlights (HLs) and taillights (TLs) as wireless transmitters and integrating photodetectors (PDs) ... -
Investigation of wireless electrification for a reconfigurable manufacturing cell
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-02-24)Reconfigurable manufacturing systems (RMS) with a rearrangeable structure can quickly adjust their productivity to meet the dynamic market changes and the demand for high-variety products. Industry 4.0 technologies have enhanced the RMS flexibility and made the automation of the reconfiguration of the manufacturing system possible. As an Industry 4.0 technology, wireless power transfer (WPT) can ... -
Modelling and simulation of interaction forces in tugboat-assisted docking of large marine vessels
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-11-22)In this paper, we address modelling and simulation of dynamics involved in docking of large marine vessels with aid of tugboats, with the aim of providing a tool for improved design of control algorithms for autonomous docking operations. Mathematical models of the docking vessel and tugboats in 3DOF are derived, with a special focus on realistic interactions through towline, contact and friction ... -
A Novel Technique to Mitigate the Overlap-Time Effect in Current Source Inverters
(Chapter; Bokkapittel, 2023-08-31)Generally, the current source inverter is considered more reliable than the voltage source inverter due to the presence of inductor as an energy storage element on the DC link, but a disruption in the inductor current could significantly risk its reliability. To guarantee the reliable operation of current source inverter, an overlap time must be added to the gate signals of its switches. This ensures ... -
Co-simulation-based optimal reactive power control in smart distribution network
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-10-30)The increasing integration of distributed energy resources such as photovoltaic (PV) systems into distribution networks introduces intermittent and variable power, leading to high voltage fluctuations. High PV integration can also result in increased terminal voltage of the network during periods of high PV generation and low load consumption. These problems can be solved by optimal utilization ... -
A Co-simulation Procedure for Optimal Reactive Power Control in Active Distribution Networks
(Chapter; Bokkapittel, 2023)Distribution grids are subject to a drastic evolution in their operating conditions due to the high integration of renewable energy resources (RES) and their ability to regulate voltage. To cope with this issue, modern solar photovoltaic (PV) systems are equipped with smart inverters enabled with communication capabilities that allow the coordinated operation to offer services such as controlling ... -
A Two-Stage Deep Modeling Approach to Articulatory Inversion
(Chapter; Bokkapittel, 2021-05-13)This paper proposes a two-stage deep feed-forward neural network (DNN) to tackle the acoustic-to-articulatory inversion (AAI) problem. DNNs are a viable solution for the AAI task, but the temporal continuity of the estimated articulatory values has not been exploited properly when a DNN is employed. In this work, we propose to address the lack of any temporal constraints while enforcing a ... -
Load modeling from smart meter data using neural network methods
(Chapter; Bokkapittel, 2021)Electricity load modeling plays a critical role to conduct load forecasting or other applications such as non-intrusive load monitoring. For such a reason, this paper investigates a comparison study of two common artificial neural network methods (Multilayer perceptron (MLP) and radial basis function neural network (RBF-NN) for home load modeling application. The accuracy of load modeling using ... -
Classification of Bulk Cargo Types Stored Openly at Ports Using CNN
(Chapter; Bokkapittel, 2023)In this paper, we present a novel concept of tracking cargoes at open ports using remote sensing images and convolution neural network (CNN) to classify various dry bulk commodities. The dataset used is prepared using Sentinel-2 atmospherically corrected (Sentinel-2 L2A) images covering 12 spectral bands. There are total 4995 labeled and geo-referenced images for four different cargoes-bauxite, ... -
Elektrifiering av hamna
(Conference object; Konferansebidrag, 2020)
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