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Now showing items 101-200 of 235
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
The rapid depletion of fossil-based energy supplies, along with the growing reliance on renewable resources, has placed supreme importance on the predictability of renewables. Research focusing on wind park power modelling ...
(Master thesis / Masteroppgave, 2022)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Abstract
With the increased penetration of wind energy into the power grid, it has become increasingly important to be able to predict the expected power production for larger wind farms. Deep learning (DL) models ...
Expert Q-learning: Deep Reinforcement Learning with Coarse State Values from Offline Expert Examples
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
In this article, we propose a novel algorithm for deep reinforcement learning named Expert Q-learning. Expert Q-learning is inspired by Dueling Q-learning and aims to incorporate semi-supervised learning into reinforcement ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
A study investigating Transformer and LSTM models applied to raw audio for automatic generation of counterpoint was conducted. In particular, the models learned to generate missing voices from an input melody, using a ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
The growing number of data centers consumes a vast amount of energy for processing. There is a desire to reduce the environmental footprint of the IT industry, and one way to achieve this is to use renewable energy sources. ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
Q-learning is one of the most well-known Reinforcement Learning algorithms. There have been tremendous efforts to develop this algorithm using neural networks. Bootstrapped Deep Q-Learning Network is amongst them. It ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Background
Intimate partner violence (IPV) during pregnancy is a global health problem with adverse consequences for mothers, infants and families. We hypothesise that information about IPV and safety ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
We propose and investigate a bidirectional device-to-device (D2D) transmission scheme that exploits cooperative downlink non-orthogonal multiple access (NOMA) (termed as BCD-NOMA). In BCD-NOMA, two source nodes communicate ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Thermography from unmanned aerial vehicles (UAV) is widely used for module condition surveys and defect detection in solar (photovoltaic) power plants. This article presents an optimized defect inspection procedure in which ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
The signal-to-noise ratio of modern cameras under normal operating conditions tends to be limited by “photon noise” originating from the random arrival of photons. For best signal-to-noise ratio, it is desirable to collect ...
(Master thesis / Masteroppgave, 2023)
I denne oppgaven har vi foreslått et system for autonom deteksjon av trygge landingsplasser. Systemet er basert på visuell navigasjon og tett dybdeestimering. Systemet bruker tett normalestimering på dybdebildene for å ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
The Industrial Internet of Things (IIoT) requires wireless connectivity that meets the strict industrial requirements on metrics such as reliability and latency. Promising approaches include Time Slotted Channel Hopping ...
(Chapter / Bokkapittel / AcceptedVersion; Peer reviewed, 2022)
Providing full autonomy to Unmanned Surface Vehicles (USV) is a challenging goal to achieve. Autonomous docking is a subtask that is particularly difficult. The vessel has to distinguish between obstacles and the dock, and ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Reanalysis data are widely used for simulating renewable energy and in particular wind power generation. While MERRA-2 has been a de-facto standard in many studies for a long time, the newer ERA5-reanalysis recently gained ...
(Chapter / Bokkapittel / AcceptedVersion; Peer reviewed, 2022)
This paper shows the feasibility of combining robust motion primitives generated through the Sums Of Squares programming theory with a discrete Rapidly exploring Random Tree algorithm. The generated robust motion primitives, ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Abstract A class of strictly localized states which can be made arbitrarily close to single photons is constructed, and expressions for central properties are provided. It is demonstrated that single photon states can be ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
Fish telemetry is a potential method to monitor the well-being of farmed fish, where a reference group of fish are equipped with sensors tags that oversee their health and wirelessly transmit the data. Many fish must be ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
Energy system models underpin decisions by energy system planners and operators. Energy system modeling faces a transformation: accounting for changing meteorological conditions imposed by climate change. To enable that ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Porous and permeable crystalline rocks have the potential of being hydrocarbon reservoirs. In many cases, reservoir properties are created by rock-altering physico-chemical processes occurring in the near-surface environment. ...
(Master thesis / Masteroppgave, 2023)
Exploring laboratory testing of radar jamming techniques Restricted Access
(Master thesis / Masteroppgave, 2023)
(Master thesis / Masteroppgave, 2023)
En måte å øke tilgjengeligheten til variable fornybare energiteknologier er å inkludere elektrisk energilagring. For å oppnå dette i storskala, er det nødvendig med en metode for sanntids ytelsesevaluering av batterisystemet. ...
(Master thesis / Masteroppgave, 2021)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Abstract
Hydrides based on magnesium and intermetallic compounds provide a viable solution to the challenge of energy storage from renewable sources, thanks to their ability to absorb and desorb hydrogen in a ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
When participating in the Scandinavian wholesale energy markets with intermittent PV power, imbalances between market-committed and actual energy generation need to be economically accounted for in the imbalance settlement. ...
Design and evaluation of a Lift-Augmented Quadcopter Restricted Access
(Master thesis / Masteroppgave, 2022)
Small multirotor Unmanned Aerial Vehicles (UAVs) have the last decades become popular in many areas because of their simple design, low cost, and ease of use. Multirotor UAVs are simple to operate because of their Vertical ...
(Master thesis / Masteroppgave, 2022)
(Conference object / Konferansebidrag / PublishedVersion, 2018)
The aim of this work is to develop and test new methods for quality control of data from commercial monitoring systems for small and medium sized PV installations. Such installations often have limited or non-existent ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Abstract
The Radar Imager for Mars’ Subsurface Experiment (RIMFAX) is a Ground Penetrating Radar on the Mars 2020 mission’s Perseverance rover, which is planned to land near a deltaic landform in Jezero crater. RIMFAX ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
A complete chemical and morphological analysis of the evolution of battery electrode materials can be achieved combining different and complementary techniques. Operando small-angle X-ray scattering (SAXS) and wide-angle ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
Background: The increasing prevalence of gestational diabetes mellitus (GDM) among women of different ethnic backgrounds provides new challenges for health care professionals, who often find it difficult to provide information ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
The radiometric performance of cameras is customarily characterized and specified in terms of component properties such as F-number and readout noise. This paper considers the camera as an integrated unit and derives ...
(Chapter / Bokkapittel / AcceptedVersion; Peer reviewed, 2020)
Non-orthogonal multiple access (NOMA) is consid-ered an important candidate for the next-generation cellular networks to address the issue of exponentially growing data traffic from technologies like the Internet of Things ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Multi-function swarms are swarms that solve multiple tasks at once. For example, a quadcopter swarm could be tasked with exploring an area of interest while simultaneously functioning as ad-hoc relays. With this type of ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
With the proliferation of technologies such as wireless sensor networks (WSNs) and the Internet of things (IoT), we are moving towards the era of automation without any human intervention. Sensors are the principal components ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
Securing and managing large, complex enterprise network infrastructure requires capturing and analyzing network traffic traces in real-time. An accurate passive Operating System (OS) fingerprinting plays a critical role ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
In this paper, we propose a novel parameter initial value estimation method of Lithium-ion battery for state of charge (SOC) estimation by using Local Regression Modeling (LRM) and Vector Fitting (VF). To estimate SOC ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
This paper proposes a linear parameter varying (LPV) interval unknown input observer for the robust fault diagnosis of actuator faults and ice accretion in unmanned aerial vehicles (UAVs) described by an uncertain model. ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
Program evolution may reveal bad design decisions, misunderstandings, erroneous code, or erroneous specifications, because problems made early in the design of a system may not be discovered until much later in the life-time ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
Policy anomalies are frequent in nowadays’s computer networks due to their increasing configuration complexity. Resolving policy anomalies usually requires network administrator intervention, which is a time-intensive and ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
Artificial intelligence (AI) receives attention in media as well as in academe and business. In media coverage and reporting, AI is predominantly described in contrasted terms, either as the ultimate solution to all human ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
The coldest and densest structures of gas and dust in the Universe have unique spectral signatures across the (sub-)millimetre bands (υ ≈30 - 950 GHz). The current generation of single dish facilities has given a glimpse ...
(Master thesis / Masteroppgave, 2022)
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)
With the emergence of Internet of Things (IoT), securing and managing large, complex enterprise network infrastructure requires capturing and analyzing network traffic traces in real time. An accurate passive operating ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
Due to the fast growth in global installed photovoltaic (PV) capacity, performance monitoring for large-scale PV systems is an increasingly relevant and important topic. A large volume of research exists in this field, but ...
(Doctoral thesis / Doktoravhandling, 2021)
The ground beneath our feet is anything but dry; there is more water held in Earth’s rocks than all the world’s oceans combined. Fluids in the subsurface are always on the move and understanding this is important in the ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
Hydrogen (H) is thought to be strongly involved in the light and elevated temperature-induced degradation observed predominantly in p-type silicon wafers, but the nature of the defect or defects involved in this process ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
Determining subsurface properties through ground penetrating radar sounding can be challenging, especially in planetary exploration, where little is known about the terrain and additional observations are limited. Analysis ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
The Planetary Terrestrial Analogues Library (PTAL) is a dedicated lithological collection that currently consists of 102 terrestrial rock samples selected to be possible Mars analogues. The ultimate goal is improving future ...
(Master thesis / Masteroppgave, 2022)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
The disposal of unexploded ordnance (UXOs) at sea is a global problem. The mapping and remediation of historic UXOs can be assisted by autonomous underwater vehicles (AUVs) carrying sensor payloads such as synthetic aperture ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
In this letter, a new method of path planning for unmanned ground vehicles (UGVs) on terrain is developed. For UGVs moving on terrain, path traversability and collision avoidance are important factors. If traversability ...
(Master thesis / Masteroppgave, 2022)
(Master thesis / Masteroppgave, 2022)
(Master thesis / Masteroppgave, 2022)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
In this paper the small-amplitude motion of multiple superposed viscous fluids is studied as a linearized initial-value problem. The analysis results in a closed set of equations for the Laplace transformed amplitudes of ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
Owing to the exponential proliferation of the Internet of Things (IoT), it is anticipated that the number of small IoT devices will grow expeditiously over the next few years. These billions of small IoT sensor and devices ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
As the policies of a software-defined networking (SDN) network can be updateddynamically and often at a high pace, conflicts between policies can easily occur. Dueto the large number of switches and heterogeneous policies ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
We state and compare four different definitions of magnetic permeability for periodic, artificial media, or metamaterials. The connections among them, and properties in general, are discussed in detail, including causality, ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
The aim of this work is characterizing the class of LPV systems that admit steady-state trajectories depending exclusively on the scheduling parameter. In particular, it will be shown that only certain parameter dependent ...
(Chapter / Bokkapittel / AcceptedVersion; Peer reviewed, 2019)
Over the past few years, innovation in the development of Wireless Sensor Networks (WSNs) has evolved rapidly. WSNs are being used in many application fields such as target coverage, battlefield surveillance, home security, ...
(Master thesis / Masteroppgave, 2021)
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
This paper is concerned with stability and control of the parabolic p-Laplace equation. The autonomous equation is shown to be asymptotically stable, while the stronger property of exponential stability is guaranteed by ...
(Master thesis / Masteroppgave, 2021)
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)
In this paper, a bidirectional relaying (BR) non-orthogonal multiple access (NOMA) with simultaneous wireless information and power transfer (SWIPT) termed as BR NOMA-SWIPT is proposed and investigated for the Internet of ...
(Master thesis / Masteroppgave, 2021)
(Master thesis / Masteroppgave, 2021)
The healthcare centers at rural areas will have a lack of available sonographers who can perform ultrasound examinations on patients. To solve this issue and allow the patient to receive the necessary help, it is beneficial ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
We report preferential orientation control in photochromic gadolinium oxyhydride (GdHO) thin films deposited by a two-step process. Gadolinium hydride (GdH2-x) films were grown by reactive magnetron sputtering, followed ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
During recent years, ray tracing has frequently been used to study the absorption characteristics of structured solar cells. However, wave properties such as absorption enhancement due to resonances in optically thin solar ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
Black TiO2 has emerged as one of the most promising photocatalysts recently discovered. The reason behind its catalytic activity is considered to be due to the presence of defects and Ti3+ species at the surface of black ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
The electricity grid is an important critical infrastructure that is undergoing major changes, due to the Internet of Things (IoT) and renewable energy, heading towards the smart grid. However, besides the many good promises ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
The concept of digital literacy has been defined in numerous ways over the last two decades to incorporate rapid technological changes, its versatility, and to bridge the global digital divide. Most approaches have been ...
Norwegian electricty demand toward 2050 Restricted Access
(Master thesis / Masteroppgave, 2022)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
As cost reductions have made photovoltaics (PV) a favorable choice also in colder climates, the number of PV plants in regions with snowfalls is increasing rapidly. Snow coverage on the PV modules will lead to significant ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
In this paper we present a novel method for measuring temperature dependent lifetime images with high spatial resolution using photoconductance calibrated photoluminescence (PL) imaging. In order to achieve this, PL images ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2017)
Results for (La,Mg)Ni3.5 and (La,Mg)(Ni,Al)3.5 systems synthesized by metallurgical and mechanochemical techniques are reported. Powder X-ray and neutron diffraction combined with Rietveld refinements and profile analysis ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
The higher order multipoles above the electric quadrupole are commonly neglected in metamaterial homogenization. We show that they nevertheless can be significant when the second-order spatial dispersive effects, such as ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
Ultraviolet (UV) SO2 cameras have become a common tool to measure and monitor SO2 emission rates, mostly from volcanoes but also from anthropogenic sources (e.g., power plants or ships). Over the past decade, the analysis ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
It is well known that the usual Kramers–Kronig relations for the relative permeability function μ(ω) are not compatible with diamagnetism (μ(0) < 1) and a positive imaginary part (Im μ(ω) > 0 for ω > 0). We demonstrate ...
(Chapter / Bokkapittel / AcceptedVersion; Peer reviewed, 2018)
Energy usage in LTE base stations are driven by spectral efficiency and traffic. To predict the energy usage these parameters must be forecasted. In this work we analyse hourly measurements collected from more than 12000 ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
Energy density and safety are the main factors that govern the development of the rechargeable battery technology. Currently, batteries beyond typical Li-ion batteries such as those based on solid-state electrolytes (SSEs) ...
(Doctoral thesis / Doktoravhandling, 2019)
High-speed flows through dense particle clouds occur in many technological applications such as explosion mitigation systems, combustion engines, drug-delivery systems, as well as natural phenomena such as volcanic eruptions ...
(Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
We investigate the shock-induced flow through random particle arrays using particle-resolved Large Eddy Simulations for different incident shock wave Mach numbers, particle volume fractions and particle sizes. We analyze ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
The Industrial Internet of Things needs wireless communication with bounded latency and stronger robustness. Nodes employing the Time Slotted Channel Hopping (TSCH) MAC operate according to a schedule, and recent work on ...
(Master thesis / Masteroppgave, 2023)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
With the rapid adoption of wind energy globally, there is a need for accurate short-term forecasting systems to improve the reliability and integration of such energy resources on a large scale. While most spatio-temporal ...
(Master thesis / Masteroppgave, 2023)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
This work presents simulation results from a system where offshore wind power is used to produce hydrogen via electrolysis. Real-world data from a 2.3 MW floating offshore wind turbine and electricity price data from Nord ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Norway, a significant petroleum producer and exporter, has been a frontrunner within policies for carbon capture and storage (CCS). As CCS is recognized as a key technology for achieving the Paris climate policy targets, ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Floating photovoltaic (FPV) systems are an emerging and increasingly competitive application of solar PV, especially in land area-constrained countries. This study focuses on the optimal dimensioning and scheduling of a ...
(Doctoral thesis / Doktoravhandling, 2024)
In the global effort to combat climate change, wind energy is of paramount importance in transitioning away from fossil fuels. But wind power comes with a challenge: it's not always blowing when we need it. That's where ...
(Master thesis / Masteroppgave, 2023)
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Abstract We establish motivic versions of the theorems of Lin and Gunawardena, thereby confirming the motivic Segal conjecture for the algebraic group of th roots of unity, where is any prime. To achieve this we develop ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Due to the market gate closures in the Nordic energy markets, producers with variable renewable energy (VRE) assets, e.g., PV and wind power plants, must forecast their production prior to delivery, leaving room for ...
(Master thesis / Masteroppgave, 2023)
This master's thesis investigates the optimal level of investment in solar power for multi-residential households in Norway, in the context of the country's upcoming solar sharing scheme. This scheme will enable localized ...
(Chapter / Bokkapittel / PublishedVersion; Peer reviewed, 2023)
This chapter discusses findings from an ongoing Horizon 2020 project, EnergyMeasures, relating to identifying and recruiting energy-poor households in seven participating countries (BE, BG, IE, MK, NL, PL, and UK). ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Point defects in silicon carbide (SiC) are well positioned for integration with SiC based quantum photonic devices due to the maturity of SiC material and fabrication technology, the plethora of candidate quantum emitters ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
The youngest part of the Valdres Group of south-central Norway (mainly the Neoproterozoic Rundemellen unit, Tonian – Cryogenian?) has been sedimentologically and stratigraphically studied and sampled at the Skarvemellen ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
Abstract Attenuation of radar waves in the subsurface can be quantified with a constant‐Q approximation through time‐frequency analysis. We implement the centroid frequency‐shift method and study Radar Imager for Mars' ...